CN113446885B - An internal circulation communication control heat pipe system - Google Patents

Abstract

The invention provides an internal circulation communication control heat pipe system. When the central controller detects that there is no flue gas passing through the pipeline, the central controller controls the third valve and the fourth valve to close, the ninth valve opens, and the central controller automatically controls the fan When it starts to run, the pipeline where the air heater and the heat storage are located forms a circulating pipeline; when the central controller detects that there is flue gas passing through the pipeline, the central controller controls the ninth valve to close, and controls the third valve and the fourth valve to be In the open state, the central controller automatically controls the fan to stop running. By controlling the intelligent operation of the fan, the invention can realize the intelligent control of the operation of the fan according to the actual situation, thereby improving the intelligence of the system.

Description

An internal circulation communication control heat pipe system

technical field

The invention relates to a heat pipe technology, in particular to a heat pipe with a novel structure.

Background technique

Heat pipe technology is a heat transfer element called "heat pipe" invented by George Grover of Los Alamos National Laboratory in the United States in 1963. It makes full use of the principle of heat conduction and phase change medium. The rapid heat transfer property of the heat pipe, the heat of the heating object is quickly transferred to the outside of the heat source through the heat pipe, and its thermal conductivity exceeds that of any known metal.

Heat pipe technology has been widely used in aerospace, military and other industries before. Since it was introduced into the radiator manufacturing industry, people have changed the design thinking of traditional radiators and got rid of the single heat dissipation mode that relies solely on high-volume motors to obtain better heat dissipation effects. The use of heat pipe technology enables the radiator to obtain satisfactory heat exchange effect, opening up a new world in the heat dissipation industry. At present, heat pipes are widely used in various heat exchange equipment, including the power field, such as the utilization of waste heat in power plants.

In the prior art, the shape of the heat pipe affects the heat absorption area of the evaporation end, so the heat absorption range of the evaporation end is generally relatively small, and sometimes multiple heat pipes need to be installed in the heat source to meet the heat absorption demand; Due to the different positions of the heat sources at each evaporating end, the phenomenon of uneven heat absorption will occur. In the prior art, in the waste heat utilization heat pipe device, the condensation end is extended to the outside of the pipe, which occupies the external area and makes the structure of the waste heat utilization system of the heat pipe not compact.

In addition, elastic vibrating tube bundles are commonly used in waste heat heat transfer. In the application, it is found that continuous heating can lead to the stability of the fluid formation in the internal heat pipe device, that is, the fluid no longer flows or has little fluidity, or the flow rate is stable, resulting in discs The tube vibration performance is greatly reduced, which affects the efficiency of the coil's descaling and heating.

However, in the application, it is found that the continuous heating of the residual heat will lead to the stability of the fluid formation in the inner loop heat pipe, that is, the fluid no longer flows or has little fluidity, or the flow is stable, which will greatly reduce the vibration performance of the coil, thereby affecting the coil. Tube descaling and heating efficiency.

In practice, it is found that when the vibration of the tube bundle is adjusted by the fixed periodic change, there will be hysteresis and the period will be too long or too short. Therefore, the present invention improves the previous application by intelligently controlling the vibration, so that the internal fluid can vibrate frequently, so as to achieve good descaling and heating effects.

However, in practice, it is found that the above-mentioned waste heat utilization system control system is lacking, cannot realize automatic control, and requires high labor cost. In view of the above problems, the present invention improves on the basis of the previous invention, and provides a waste heat utilization system with a new structure, which fully utilizes the heat source, reduces energy consumption, and realizes intelligent control.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention improves on the basis of the previous invention, and provides a new heat pipe system, so as to realize the intelligent and full utilization of waste heat.

In order to achieve the above object, technical scheme of the present invention is as follows:

An internal circulation communication control heat pipe system includes a flue and a heat pipe. The two ends of the flue are respectively provided with a flue gas inlet and a flue gas outlet, and a flue gas inlet and a flue gas outlet are fixed in the flue. Connected heat pipes; the heat pipes are U-shaped pipes; the surface of the flue is hinged with a clean and sealed door. An internal circulation communication control heat pipe system, the system comprises an air heater and a heat accumulator, the air heater is arranged on a main pipe of a flue, the heat accumulator is arranged on a secondary pipe, the main pipe and The auxiliary pipeline forms a parallel pipeline; the system includes a third valve and a fourth valve, the third valve is arranged on the flue gas pipeline upstream of the air heater and the heat storage device, and the fourth valve is arranged on the air heater and the heat storage device. On the downstream flue gas pipeline, the system is also provided with a bypass pipeline connected to the main pipeline of the flue, the connection position of the bypass pipeline and the main pipeline of the flue is located upstream of the third valve, and the bypass pipeline Set the ninth valve on the upper;

A flue gas sensor is arranged in the flue gas pipeline upstream of the third valve, and the flue gas sensor is used to detect whether there is flue gas flowing through the flue; the flue gas sensor is connected with the central controller, and the central controller is based on the flue gas. The data detected by the sensor is used to control the opening and closing of the third valve and the fourth valve; a fan is set on the auxiliary pipeline, and the fan is connected with the central controller, and the central controller automatically controls the data monitored by the flue sensor. the operation of the fan;

When the central controller detects that there is no flue gas passing through the pipeline, the central controller controls the third valve and the fourth valve to close, and the ninth valve to open. The road forms a circulating pipeline; when the central controller detects that there is flue gas passing through the pipeline, the central controller controls the ninth valve to close, controls the third valve and the fourth valve to be open, and the central controller automatically controls the fan to stop running.

Preferably, the main flue gas pipeline includes a first bypass pipeline and a second bypass pipeline, wherein a fifth valve and an air heater are respectively arranged on the first bypass pipeline, a first heat pipe is arranged in the air heater, the first A sixth valve is arranged on the main flue gas pipeline corresponding to the bypass pipeline; an eighth valve and a second air heater are respectively arranged on the second bypass pipeline, a second heat pipe and a second bypass pipe are arranged in the second air heater. A seventh valve is set on the main flue gas pipeline corresponding to the road;

Temperature sensing elements are set inside the first heat pipe and the second heat pipe, the controller extracts temperature data according to the time sequence, and obtains the temperature difference or the accumulation of temperature difference changes by comparing the temperature data of adjacent time periods. The temperature difference or the accumulation of temperature difference changes are used to control whether the flue gas heats the first heat pipe and the second heat pipe;

The steps of heating the first heat pipe and the second heat pipe are as follows:

1) The fifth valve and the seventh valve are opened, and the sixth valve and the eighth valve are closed, so that the flue gas enters the first heat pipe for heat exchange, and does not enter the second heat pipe, so that the tube bundle in the first heat pipe vibrates, so as to achieve strengthening Heat transfer and descaling purposes;

2) The temperature difference detected by the temperature sensing element in the first heat pipe or the accumulated temperature difference change is lower than a certain value. At this time, the controller controls the sixth valve and the eighth valve to open, and the fifth valve and the seventh valve to close, so that the smoke The gas enters the second heat pipe for heat exchange, but does not enter the first heat pipe, so that the tube bundle in the second heat pipe vibrates, so as to achieve the purpose of strengthening heat transfer and descaling;

3) When the temperature difference detected by the temperature sensing element in the second heat pipe or the accumulated temperature difference change is lower than a certain value, the controller controls the fifth valve and the seventh valve to open, and the sixth valve and the eighth valve to close, so that the flue gas Enter the first heat pipe for heat exchange, and do not enter the second heat pipe, so that the tube bundle in the first heat pipe vibrates, so as to achieve the purpose of strengthening heat transfer and descaling;

Then, steps 2) and 3) are continuously repeated, so as to realize the alternate heating of the first heat pipe and the second heat pipe.

Preferably, the temperature sensing element is arranged at the free end of the left heat-releasing tube group and/or the right heat-releasing tube group.

Preferably, the first heat pipe and the second heat pipe include an evaporating part and a condensing part, the condensing part includes a left condensing pipe, a right condensing pipe and a heat releasing pipe group, and the heat releasing pipe group includes a left heat releasing pipe group and a right heat releasing pipe The left heat release tube group is connected with the left condenser tube and the evaporation part, and the right heat release tube group is connected with the right condenser tube and the evaporation part, so that the evaporation part, the left condenser tube, the right condensation tube and the heat release tube group form a closed heating fluid Circulation, the evaporation part is filled with phase change fluid, each heat release tube group includes a plurality of arc-shaped heat release tubes, and the ends of adjacent heat release tubes are connected, so that the plurality of heat release tubes form a series structure, and the ends of the heat release tubes form The free end of the heat release pipe; the evaporation part includes a first pipe port and a second pipe port, the first pipe port is connected to the inlet of the left heat release pipe group, the second pipe port is connected to the inlet of the right heat release pipe group, and the outlet of the left heat release pipe group is connected to the left Condenser pipe, the outlet of the right heat release pipe group is connected to the right condenser pipe; the first pipe port and the second pipe port are arranged on one side of the evaporation part; the evaporation part is the evaporation end of the heat pipe, and the condensation part is the condensation end of the heat pipe, so At least a part or all of the condensation part is arranged in the air passage, and the evaporation part is arranged in the flue gas pipe; a left return pipe is arranged between the left condensation pipe and the evaporation part, and a left return pipe is arranged between the right condensation pipe and the evaporation part. Set the right return line. The evaporation part is arranged in the flue, and the condensation part heats the air in the air heater.

Preferably, the left heat-releasing tube group and the right heat-releasing tube group are symmetrical along the middle position of the evaporation part.

Preferably, the evaporation end is a flat tube structure.

Preferably, the evaporation end is located at the lower part of the condensation end.

Compared with the prior art, the present invention has the following advantages:

1. By controlling the intelligent operation of the fan, the present invention can realize the intelligent control of the fan operation according to the actual situation, which improves the intelligence of the system.

2. The temperature difference or accumulated temperature difference detected by the temperature sensing element in the present invention can basically achieve saturation of the evaporation of the internal fluid under the condition that a certain temperature difference is satisfied, and the volume of the internal fluid also basically changes little. In this case At this time, the internal fluid is relatively stable, and the vibration of the tube bundle becomes worse at this time, so it needs to be adjusted to make it vibrate, so as to stop heating, so as to switch to another heat pipe for heating. Therefore, according to the temperature, the heat pipe is continuously heated alternately, thereby forming the continuous vibration descaling and heat exchange of the heat pipe.

3. A waste heat utilization device with a new structure, by setting more heat releasing tube groups in a limited space, increasing the vibration range of the tube bundle, thereby enhancing heat transfer and enhancing descaling.

4. The present invention can further improve the heat exchange efficiency by setting the pipe diameter and spacing distribution of the exothermic tube group in the fluid flow direction.

5. The present invention optimizes the optimal relationship of the parameters of the heat pipe device through a large number of experiments and numerical simulations, thereby realizing the optimal heat exchange efficiency.

Description of drawings

FIG. 1 is a schematic diagram of the pipeline of the waste heat utilization system of the present invention.

FIG. 2 is a schematic diagram of the preferred structure of the pipeline of the waste heat utilization system of the present invention.

FIG. 3 is a schematic diagram of the pipeline of the waste heat utilization system of the present invention.

4 is a front view of the waste heat utilization device of the present invention.

FIG. 5 is a front view of the waste heat utilization system of the present invention.

FIG. 6 is a left side observation view of the waste heat utilization device of FIG. 4 according to the present invention.

FIG. 7 is a bottom view of the waste heat utilization device of FIG. 4 according to the present invention.

FIG. 8 is a schematic diagram of the staggered arrangement of the heat release tube groups of the waste heat utilization device of the present invention.

FIG. 9 is a schematic diagram of the size and structure of the waste heat utilization device.

FIG. 10 is a schematic structural diagram of a flue gas waste heat utilization device provided with a bypass pipe.

In the figure: 1. Heat release tube group, left heat release tube group 11, right heat release tube group 12, 21, upper left tube, 22, upper right tube, 3, free end, 4, free end, 5, free end, 6, free end , 7, heat release pipe, 8, evaporation part, 10 first nozzle, 13 second nozzle, left return pipe 14, right return pipe 15, flue gas pipe 101, air pipe 102, pipe 103, dividing wall 104; heat pipe 16. Heat pipe 17, fifth valve 18, sixth valve 19, seventh valve 20, and eighth valve 23.

Detailed ways

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In this article, if there are no special instructions, when it comes to formulas, "/" means division, and "×" and "*" mean multiplication.

An internal circulation communication control heat pipe system includes a flue and a heat pipe. The two ends of the flue are respectively provided with a flue gas inlet and a flue gas outlet, and a flue gas inlet and a flue gas outlet are fixed in the flue. Connected heat pipes; the heat pipes are U-shaped pipes; the surface of the flue is hinged with a clean and sealed door. As shown in FIG. 1, a waste heat utilization system includes an air heater 31 and a heat storage device 32, the air heater 31 is arranged on the main pipe 42 of the flue, and the air heater 31 absorbs smoke waste heat to generate hot air. The heat accumulator 32 is arranged on the auxiliary pipeline 43, and the main pipeline 42 and the auxiliary pipeline 43 form a parallel pipeline. The flue gas in the flue 101 enters the air heater 31 and the heat accumulator 32 of the main duct 42 and the auxiliary duct 43 respectively, where hot air is generated in the air heater 31, heat is stored in the heat accumulator 32, and heated in the air The flue gas after heat exchange in the heat exchanger 31 and the heat accumulator 32 is reconverged into the general flue.

In the above-mentioned system, while generating hot air through the waste heat of flue gas, the heat accumulator can be used for heat storage.

As a preference, only the air heater 31 can be provided in this system, and no auxiliary pipeline is provided.

Preferably, the flue gas is the flue gas produced by boiler combustion.

As shown in FIG. 1 , the system includes a first valve 34 and a second valve 35 , a third valve 36 and a fourth valve 37 , and the third valve 36 is arranged in the flue gas pipeline upstream of the air heater 31 and the heat accumulator 32 101 is used to control the total flue gas flow into the air heater 31 and the heat accumulator 32, the fourth valve 37 is arranged on the flue gas pipeline 101 downstream of the air heater 31 and the heat accumulator 32, the second valve 35 The first valve 34 is arranged at the position of the inlet pipe of the heat accumulator 32 of the auxiliary pipe 43, and is arranged at the position of the inlet of the air heater 31 of the main flue 42 to control the flow rate of the flue gas entering the air heater 31, For controlling the flow rate of the flue gas entering the heat storage device 32, the system also includes a central controller, which conducts data with the first valve 34, the second valve 35, the third valve 36, and the fourth valve 37. connect. The central controller controls the opening and closing of the first valve 34 , the second valve 35 , the third valve 36 and the fourth valve 37 and the size of the opening, thereby controlling the amount of flue gas entering the air heater 31 and the heat storage device 32 .

Preferably, as shown in FIG. 10 , the system is further provided with a bypass pipe connected to the main pipe 42 of the flue, and the connection position of the bypass pipe and the main pipe 42 of the flue is located upstream of the third valve 36, A ninth valve 45 is provided on the bypass pipeline. The ninth valve 45 is data-connected to the central controller. The opening and closing of the ninth valve 45 can ensure whether the flue gas passes through the air heater 31 and the heat accumulator 32 or not.

Preferably, the ninth valve 45 is opened, and the third valve 36 and the fourth valve 37 are closed.

(1) Control the opening and closing of the valve according to the flow of flue gas

Preferably, a flue gas sensor is provided in the flue gas duct 101 upstream of the third valve 36, and the flue gas sensor is used to detect whether flue gas flows through the flue. The smoke sensor is connected with the central controller, and the central controller controls the opening and closing of the third valve 36 and the fourth valve according to the data detected by the smoke sensor.

When the central controller detects that flue gas passes through the flue gas duct 101, for example, when the boiler is running, the central controller controls the third valve 36 and the fourth valve 37 to be open, and the flue gas can enter the air heater 31 and the storage tank. Heater 32, exhaust smoke after heat exchange is completed. When the central controller detects that there is no flue gas passing through the flue gas pipe 101, for example, when the boiler stops running, the central controller controls the third valve 36 and the fourth valve 37 to close, and the pipeline where the air heater 31 and the heat accumulator 32 are located is formed. a circulation line. At this time, the air heater 31 is heated by the heat stored in the heat accumulator 32, thereby generating hot air. Through the above operation, when there is flue gas, the excess heat can be stored in the heat accumulator 32 under the condition that the amount of hot air generated by the air heater 31 is satisfied, and when there is no flue gas residual heat, the use of The heat stored in the waste heat of the flue gas is used to heat the air heater 31 to meet the actual working requirements of the air heater 31 . In this way, the waste heat of the flue gas can be fully utilized and the waste of excessive heat can be avoided.

Preferably, the ninth valve 45 is opened, and the third valve 36 and the fourth valve 37 are closed.

Preferably, when the smoke sensor detects smoke, the central controller controls the ninth valve 45 to close, and the third valve 36 and the fourth valve 37 to open.

Preferably, when the smoke sensor detects that there is no smoke, the central controller controls the ninth valve 45 to open, and the third valve 36 and the fourth valve 37 to close.

(2) Control the operation of the closed circulation system fan according to the flue gas flow

Preferably, a fan is provided on the auxiliary pipeline 43, so that the pipeline where the air heater 31 and the heat storage device 32 are located forms a circulating pipeline through the operation of the fan when there is no residual heat of the flue gas.

Preferably, the fan is connected to a central controller for data connection, and the central controller automatically controls the operation of the fan according to the data monitored by the smoke sensor.

When the central controller detects that there is flue gas passing through the pipeline, the central controller automatically controls the fan to stop running. When the central controller detects that there is no flue gas passing through the pipeline, the central controller automatically controls the fan to start running. By controlling the intelligent operation of the fan, the intelligent control of the fan operation can be realized according to the actual situation, which improves the intelligence of the system.

(3) Control the operation of the fan according to the double temperature detection

Preferably, a first temperature sensor is provided in the heat storage device 32 for detecting the temperature of the heat storage material in the heat storage device. A second temperature sensor is arranged in the air heater for detecting the temperature of the air in the air heater 31 . The first temperature sensor and the second temperature sensor are in data connection with the central controller. The central controller automatically controls the operation of the fan according to the temperatures detected by the first temperature sensor and the second temperature sensor.

If the temperature detected by the first temperature sensor is lower than the temperature detected by the second temperature sensor, the central controller controls the fan to stop running. If the temperature detected by the first temperature sensor is higher than the temperature detected by the second temperature sensor, the central controller controls the fan to start running.

The operation of the fan is controlled by the detected temperature, and the air heater can be heated independently. Because it was found in the process of research and development and experimentation that when the heat of the heat accumulator is gradually used up, the temperature of the gas coming out of the heat accumulator will be lower than the temperature of the air in the air heater 31 . It is not possible to use a thermal storage to heat the air heater, instead it may cause the heat of the air heater to be taken away. Therefore, by intelligently controlling the operation of the fan according to the detected temperature, the circulation of the heat accumulator 32 and the air heater 31 is intelligently controlled, and the generation rate of hot air is improved.

(4) Control the opening of the valve according to the temperature of the flue gas at the inlet of the air heater

Preferably, the third temperature sensor is disposed at the position of the flue gas inlet of the air heater 31 for measuring the temperature of the flue gas entering the air heater 31 . The third temperature sensor is connected with the central controller, and the central controller automatically controls the valve openings of the second valve 35 and the first valve 34 according to the temperature detected by the third temperature sensor.

Preferably, when the temperature measured by the third temperature sensor is lower than a certain temperature, the central controller controls the valve 35 to increase the opening degree, and simultaneously controls the valve 34 to reduce the opening degree, so as to increase the amount of flue gas entering the air heater 31. flow. When the temperature measured by the third temperature sensor is higher than a certain temperature, the central controller controls the valve 35 to reduce the opening degree, and simultaneously controls the valve 34 to increase the opening degree to reduce the flow of hot air entering the air heater 31 .

When the temperature measured by the third temperature sensor is low to a certain temperature, the ability of the air heater 31 to generate hot air will become poor and cannot meet the normal demand, so more flue gas is needed to heat the air heater, thereby Generates hot air.

Through the above operation, when the flue gas temperature is high, after meeting the demand for hot air generation, the excess heat can be stored through the heat storage device, and when the flue gas temperature is low, more flue gas can be fed into The air heater is used to generate hot air, which ensures the demand of hot air and saves energy at the same time.

(5) Control the opening and closing of the valve according to the flue gas temperature

Preferably, a fourth temperature sensor is provided in the flue gas pipeline 101 upstream of the third valve 36, and the fourth temperature sensor is used to detect the temperature of the flue gas in the flue. The fourth temperature sensor is connected with the central controller, and the central controller controls the opening and closing of the third valve 36 and the fourth valve 37 according to the data detected by the fourth temperature sensor.

When the central controller detects that the temperature of the flue gas duct 101 exceeds a certain temperature, for example, the boiler starts to emit high-temperature flue gas during operation, the central controller controls the third valve 36 and the fourth valve 37 to be open, and the flue gas can be discharged. Enter the air heater 31 and the heat accumulator 32, and exhaust smoke after the heat exchange is completed. When the central controller detects that the flue gas temperature of the flue gas duct 101 is lower than a certain temperature, for example, when the boiler stops running, or the flue gas temperature is low due to the previous waste heat utilization, in order to avoid low-temperature corrosion or the waste heat cannot be utilized, the central The controller controls the third valve 36 and the fourth valve 37 to close, and the pipeline where the air heater 31 and the heat storage device 32 are located forms a circulating pipeline. At this time, the air heater 31 is heated by the heat stored in the heat accumulator 32, thereby generating hot air. Through the above operation, the excess heat can be stored in the heat accumulator 32 when the flue gas temperature meets the requirements and the amount of hot air generated by the air heater 31, and when there is no flue gas residual heat Next, the heat stored in the waste heat of the flue gas is used to heat the air heater 31 to meet the actual working requirements of the air heater 31 . In this way, the waste heat of the flue gas can be fully utilized and the waste of excessive heat can be avoided.

Preferably, when the smoke sensor detects that the temperature exceeds a certain temperature, the central controller controls the ninth valve 45 to close, and the third valve 36 and the fourth valve 37 to open.

Preferably, when the smoke sensor detects that the temperature is lower than a certain temperature, the central controller controls the ninth valve 45 to open, and the third valve 36 and the fourth valve 37 to close.

(6) Control the operation of the closed circulation system fan according to the flue gas flow

This embodiment is an improvement on the basis of the fifth embodiment.

Preferably, a fan is provided on the auxiliary pipe 43, and when the temperature of the flue gas is lower than a certain level, the operation of the fan makes the pipeline where the air heater 31 and the heat storage 32 are located form a circulation pipeline.

Preferably, the fan is connected with a central controller for data connection, and the central controller automatically controls the operation of the fan according to the data monitored by the smoke sensor.

When the central controller detects that the flue gas temperature in the pipeline is higher than a certain temperature, the central controller controls the third valve 36 and the fourth valve 37 to open, and automatically controls the fan to stop running. Because the flue gas temperature at this time meets the heat exchange requirement, the flue gas can be used to heat the air heater and the heat accumulator 32 . When the central controller detects that the flue gas temperature in the pipeline is lower than a certain temperature, the central controller controls the third valve 36 and the fourth valve 37 to close, and the central controller automatically controls the fan to start running. Because the temperature of the flue gas at this time does not meet the heat exchange requirement, it is necessary to use the heat accumulator 32 to heat the air heater. By controlling the intelligent operation of the fan according to the temperature of the flue gas, the intelligent control of the operation of the fan can be realized according to the actual situation, which improves the intelligence of the system.

When the central controller detects that the flue gas temperature in the pipeline is higher than a certain temperature, the fifth valve is closed. When the central controller detects that the flue gas temperature in the pipeline is lower than a certain temperature, the fifth valve opens.

(7) Control the operation of the fan according to the temperature detection at the outlet of the heat accumulator

Preferably, the outlet of the heat storage device 32 is provided with a first temperature sensor for detecting the temperature of the gas at the outlet of the heat storage device. A second temperature sensor is arranged in the air heater for detecting the temperature of the air in the air heater 31 . The first temperature sensor and the second temperature sensor are in data connection with the central controller. The central controller automatically controls the operation of the fan according to the temperatures detected by the first temperature sensor and the second temperature sensor.

If the temperature detected by the first temperature sensor is lower than the temperature detected by the second temperature sensor, the central controller controls the fan to stop running.

When the third valve and the fourth valve are closed, the operation of the fan is controlled by the detected temperature, and the air heater can be heated independently. Because it was found in the process of research and development and experimentation that when the heat of the heat accumulator is gradually used up, the temperature of the gas coming out of the heat accumulator will be lower than the temperature of the air in the air heater 31 . It is not possible to use a thermal storage to heat the air heater, instead it may cause the heat of the air heater to be taken away. Therefore, by intelligently controlling the operation of the fan according to the detected temperature, the circulation of the heat accumulator 32 and the air heater 31 is intelligently controlled, and the generation rate of hot air is improved.

FIG. 3 discloses a schematic structural diagram of the flue gas duct where the air heater of the present invention is located. As shown in FIG. 3 , the main flue gas pipeline 42 where the air heater is located includes two bypass pipelines, a first bypass pipeline and a second bypass pipeline, wherein a fifth valve is respectively provided on the first bypass pipeline 18 and the air heater 31, the heat pipe 16 is set in the air heater 31, the sixth valve 19 is set on the main flue gas pipeline 42 corresponding to the first bypass pipeline, and by setting the fifth valve 18 and the sixth valve 19, it is possible to control Whether the flue gas passes through the heat pipe 16 for waste heat utilization. The eighth valve 23 and another air heater 31 are respectively arranged on the second bypass pipeline, the heat pipe 17 is arranged in the air heater 31, and the seventh valve 20 is arranged on the main flue gas pipeline 42 corresponding to the second bypass pipeline, By setting the eighth valve 23 and the seventh valve 20, it is possible to control whether the flue gas passes through the heat pipes 17 and 16 for waste heat utilization.

Preferably, the first bypass pipeline and the second bypass pipeline are located on the same side of the main flue gas pipeline 42 , as shown in FIG. 2 , so that the heat pipes 16 and 17 can heat the same fluid.

Preferably, the heat pipe is an elastic vibration tube bundle heat pipe, and the structure is shown in Figures 4-9. The heat pipes 16 and 17 of the flue waste heat device are arranged in the flue. The heat pipes include an evaporation part 8 and a condensation part. The condenser part includes a left condenser tube 21, a right condenser tube 22 and a heat release tube group 1, the heat release tube group 1 includes a left heat release tube group 11 and a right heat release tube group 12, the left heat release tube group 11 and the left condenser tube 21 and the evaporation part 8 are connected, and the right heat release tube group 12 is connected with the right condenser tube 22 and the evaporation part 8, so that the evaporation part 8, the left condenser tube 21, the right condenser tube 22 and the heat release tube group 1 form a closed cycle of heating fluid, and the evaporation part 8 Filled with phase change fluid, each heat release tube group 1 includes a plurality of arc-shaped heat release tubes 7, and the ends of adjacent heat release tubes 7 are connected, so that the plurality of heat release tubes 7 form a series structure, and the ends of the heat release tubes 7 are connected. The evaporating part includes a first nozzle 10 and a second nozzle 13, the first nozzle 10 is connected to the inlet of the left heat-releasing tube group 11, and the second nozzle 13 is connected to the right heat-releasing tube group 12. The outlet of the left heat release tube group 11 is connected to the left condenser tube 21, and the outlet of the right heat release tube group 12 is connected to the right condenser tube 22; Preferably, the left heat radiation tube group 11 and the right heat radiation tube group 12 are symmetrical along the middle position of the evaporation part.

The evaporation part 8 is the evaporation end of the heat pipe, and the condensation part is the condensation end of the heat pipe. At least a part or all of the condensation part is arranged in the air passage 102 , and the evaporation part 8 is arranged in the flue gas duct 101 .

Preferably, the evaporation end 8 is a flat tube structure.

The evaporation end 8 is located at the lower part of the condensation end.

During operation, the heat pipe of the present invention absorbs heat from the flue gas through the evaporating end 8, and then the fluid in the evaporating end 8 is evaporated, and enters the condensing part through the first pipe port 10 and the second pipe port 13, and then the heat is converted into the condensing part in the condensing part. The air released to the air heater 31 condenses the fluid, and then enters the evaporation end by the action of gravity.

The invention improves the structure by setting the condensation end of the heat pipe, and increases the heat absorption area of the evaporation end of the heat pipe without changing the volume of the condensation end of the heat pipe, thus expanding the heat release range of the heat pipe. Compared with the evaporating end and the condensing end of the heat pipe in the prior art, keeping the same size, the heat exchange efficiency can be improved by more than 35%. At the same time, the volume and footprint of the condensing end are reduced, making the structure compact.

Preferably, the left condensing pipe 21 , the right condensing pipe 22 and the evaporation part 8 extend along the horizontal direction.

Preferably, a plurality of heat radiating tube groups 1 are arranged along the horizontal direction of the left condensing pipe 21 , the right condensing pipe 22 and the evaporation part 8 , and the heat radiating pipe groups 1 are in a parallel structure.

Preferably, a left return pipe 14 is arranged between the left condensation pipe 21 and the evaporation part 8 , and a right return pipe 15 is arranged between the right condensation pipe 22 and the evaporation part 8 . Preferably, the return pipes are arranged at both ends in the horizontal direction.

The evaporation part 8 is filled with a phase change fluid, preferably a vapor-liquid phase change fluid. The fluid is heated and evaporated in the evaporating part 8, and flows to the left condensing pipe 21 and the right condensing pipe 22 along the heat release tube bundle. After the fluid is heated, it will expand in volume, thereby forming steam, and the volume of steam is much larger than that of water, so The resulting steam flows rapidly and impinges through the coil. Due to the volume expansion and the flow of steam, the free end of the heat exchanging tube can be induced to vibrate, and the free end of the heat exchange tube transmits the vibration to the surrounding heat exchange fluid during the vibration process, and the fluids will also disturb each other, so that the surrounding The heat exchange fluid forms a turbulent flow and destroys the boundary layer, thereby achieving the purpose of enhancing heat transfer. After the fluid condenses and releases heat in the left and right condenser tubes, it returns to the evaporation part through the return tube.

By improving the prior art, the present invention sets the upper tube and the heat release tube group as two distributed on the left and right, so that the heat release tube groups distributed on the left and right sides can perform vibration heat exchange and descaling, thereby expanding the heat exchange vibration. The more uniform the vibration is, the more uniform the heat exchange effect is, the more heat exchange area is increased, and the heat exchange and descaling effect are strengthened.

In practical applications, it is found that continuous heating will lead to the stability of the fluid formation of the internal heat pipe device, that is, the fluid no longer flows or has little fluidity, or the flow rate is stable, which will greatly weaken the vibration performance of the coil, thereby affecting the removal of the coil. scale and heating efficiency.

In the applicant's previous application, a periodic heating method is proposed, through which the vibration of the coil is continuously promoted, thereby improving the heating efficiency and the descaling effect. However, when the vibration of the tube bundle is adjusted by a fixed periodic change, there will be hysteresis and the period will be too long or too short. Therefore, the present invention improves the previous application by intelligently controlling the vibration, so that the internal fluid can vibrate frequently, so as to achieve good descaling and heating effects.

Aiming at the deficiencies in the previously researched technologies, the present invention provides a novel waste heat utilization loop heat pipe system with intelligent vibration control. It can improve the heating efficiency, so as to achieve a good descaling and heating effect.

The flue gas enters two air heaters 31 , which heat the air through the heat pipes 16 , 17 . When the air heater 31 normally heats the air, the following control methods are adopted:

1. Self-adjusting vibration based on pressure

Preferably, pressure sensing elements are arranged inside the loop heat pipes 16 and 17 to detect the pressure inside the electric heating device, and the pressure sensing elements are connected with the controller. Comparing the pressure data of the time period, obtain the pressure difference or the accumulation of pressure difference changes. The controller controls whether the flue gas heats the heat pipes 16 and 17 according to the detected pressure difference or the accumulation of pressure difference changes.

The heat exchange steps of the heat pipe 16 and the heat pipe 17 are as follows:

1) The fifth valve 18 and the seventh valve 20 are opened, and the sixth valve 19 and the eighth valve 23 are closed, so that the flue gas enters the heat pipe 16 for heat exchange, and does not enter the heat pipe 17, so that the tube bundle in the heat pipe 16 vibrates, so as to achieve Enhance heat transfer and descaling purposes;

2) The pressure difference detected by the pressure sensing element in the heat pipe 16 or the accumulated pressure difference change is lower than a certain value. At this time, the controller controls the sixth valve 19 and the eighth valve 23 to open, and the fifth valve 18 and the seventh valve 20 to close. , so that the flue gas enters the heat pipe 17 for heat exchange, and does not enter the heat pipe 16, so that the tube bundle in the heat pipe 17 vibrates, so as to achieve the purpose of strengthening heat transfer and descaling;

3) When the pressure difference detected by the pressure sensing element in the heat pipe 17 or the accumulated pressure difference change is lower than a certain value, the controller controls the fifth valve 18 and the seventh valve 20 to open, and the sixth valve 19 and the eighth valve 23 to close. The flue gas enters the heat pipe 16 for heat exchange, and does not enter the heat pipe 17, so that the tube bundle in the heat pipe 16 vibrates, thereby achieving the purpose of strengthening heat transfer and descaling.

Then, steps 2) and 3) are continuously repeated, so as to realize the alternate heating of the heat pipes 16 and 17 .

Through the pressure difference or accumulated pressure difference detected by the pressure sensing element, it can be judged by the pressure difference that the evaporation of the internal fluid has basically reached saturation, and the volume of the internal fluid has basically changed little. In this case, the internal fluid is relatively Stable, the vibration of the tube bundle at this time is poor, so it is necessary to adjust and make it vibrate to stop heating and switch to another heat pipe for heating. Therefore, the heat pipes 16 and 17 are continuously and alternately heated according to the pressure, thereby forming the continuous vibration descaling and heat exchange of the heat pipes 16 and 17 .

By judging the stable state of the fluid according to the pressure difference or the accumulation of pressure difference changes, the results are more accurate, and there will be no increase in errors caused by aging caused by running time problems.

Preferably, during the heat exchange process of the heat pipe 16 or the heat pipe 17, if the pressure in the previous time period is P1, and the pressure in the adjacent subsequent time period is P2, if P1<P2, then the pressure difference between P2-P1 is lower than the threshold value , the controller switches to another heat pipe 17 or 16 for heating by controlling the valve.

Through successive pressure judgments, it is determined that the current heat pipe is in a heating state, so as to determine the operating state of the heat source according to different situations.

Preferably, during the heat exchange process of the heat pipe 16 or the heat pipe 17, if the pressure in the previous time period is P1, and the pressure in the adjacent subsequent time period is P2, if P1=P2, the heating is judged according to the following conditions:

If P1 is greater than the pressure of the first data, the controller controls the valve to switch the heat pipe for heating; wherein the first data is greater than the pressure of the phase change fluid after the phase change occurs; preferably, the first data is the pressure of the phase change fluid with sufficient phase change;

If P1 is less than or equal to the pressure of the second data, the controller controls the heat source to continue heating, wherein the second data is less than or equal to the pressure of the phase change fluid without phase change.

The first data is the pressure data of the fully heated state, and the second data is the pressure data of no heating or just beginning of the heating. By judging the size of the pressure above, it is also to determine whether the current heat source is in a heating state or a non-heating state, so as to determine the operating state of the heat source according to different situations.

，当Y的值低于设定阈值时，控制器控制阀门是否切换加热热管。Preferably, the number of pressure sensing elements is n, and the difference D _i =P _i −Q _i-1 between the pressure P _i in the current time period and the pressure Q _i-1 in the previous time period is calculated in turn, and the n pressure differences D are calculated. _i for arithmetic cumulative summation

, when the value of Y is lower than the set threshold, the controller controls whether the valve switches the heating heat pipe.

Preferably, when Y>0, when the value is lower than the threshold, the controller controls the valve to switch the heating heat pipe; if Y<0, when the value is lower than the threshold, the heat pipe is not switched.

The current heating state of the heat pipe is determined by judging the magnitude of the pressure successively, so as to determine the operating state of the heat source according to different situations.

As a preference, if Y=0, the heating is judged according to the following conditions:

If the arithmetic mean of P _i is greater than the pressure of the first data, the controller switches the heat pipe; wherein the first data is greater than the pressure of the phase change fluid after the phase change occurs; preferably, the pressure of the phase change fluid is sufficient for the phase change;

If the arithmetic mean of _Pi is less than the pressure of the second data, the controller controls the heat pipe to continue heating, wherein the second data is less than or equal to the pressure of the phase change fluid without phase change.

The first data is the pressure data of the fully heated state, and the second data is the pressure data of no heating or just beginning of the heating. By judging the size of the pressure above, it is also to determine whether the current heat source is in a heating state or a non-heating state, so as to determine the operating state of the heat source according to different situations.

Preferably, the time period period for measuring the pressure is 1-10 minutes, preferably 3-6 minutes, and more preferably 4 minutes.

Preferably, the threshold is 100-1000pa, preferably 500pa.

Preferably, the pressure value may be an average pressure value over a period of time. It can also be the pressure at a certain moment in the time period. For example, it is preferred to be the pressure at the end of the time period.

Preferably, the pressure sensing element is arranged in the upper left tube 21 and/or the upper right tube 22 .

Preferably, the pressure sensing elements are arranged in the upper left tube 21 and the upper right tube 22 . At this time, the average pressure of the two tube boxes can be selected as the adjustment data.

Preferably, the pressure sensing element is arranged at the free end of the left heat-releasing tube group and/or the right heat-releasing tube group. By setting it at the free end, the pressure change at the free end can be sensed, thereby achieving better control and regulation. At this time, the average pressure of the two heat-releasing tube groups can be selected as the adjustment data.

2. Self-adjusting vibration based on temperature

Preferably, temperature sensing elements are provided inside the loop heat pipes 16 and 17 to detect the temperature inside the electric heating device, the temperature sensing elements are connected with the controller, and the controller extracts the temperature data according to the time sequence, through the adjacent Comparing the temperature data in the time period, obtain the temperature difference or the accumulation of temperature difference changes. The controller controls whether the flue gas heats the heat pipes 16 and 17 according to the detected temperature difference or the accumulation of temperature difference changes.

The heat exchange steps of the heat pipe 16 and the heat pipe 17 are as follows:

1) The fifth valve 18 and the seventh valve 20 are opened, and the sixth valve 19 and the eighth valve 23 are closed, so that the flue gas enters the heat pipe 16 for heat exchange, and does not enter the heat pipe 17, so that the tube bundle in the heat pipe 16 vibrates, so as to achieve Enhance heat transfer and descaling purposes;

2) The temperature difference detected by the temperature sensing element in the heat pipe 16 or the accumulated temperature difference change is lower than a certain value. At this time, the controller controls the sixth valve 19 and the eighth valve 23 to open, and the fifth valve 18 and the seventh valve 20 to close. , so that the flue gas enters the heat pipe 17 for heat exchange, and does not enter the heat pipe 16, so that the tube bundle in the heat pipe 17 vibrates, so as to achieve the purpose of strengthening heat transfer and descaling;

3) When the temperature difference detected by the temperature sensing element in the heat pipe 17 or the accumulated temperature difference change is lower than a certain value, the controller controls the fifth valve 18 and the seventh valve 20 to open, and the sixth valve 19 and the eighth valve 23 to close. The flue gas enters the heat pipe 16 for heat exchange, and does not enter the heat pipe 17, so that the tube bundle in the heat pipe 16 vibrates, thereby achieving the purpose of strengthening heat transfer and descaling.

Then, steps 2) and 3) are continuously repeated, so as to realize the alternate heating of the heat pipes 16 and 17 .

The temperature difference detected by the temperature sensing element or the accumulation of the temperature difference change can basically reach saturation in the evaporation of the internal fluid under the condition of satisfying a certain temperature, and the volume of the internal fluid also basically changes little. The fluid is relatively stable, and the vibration of the tube bundle becomes worse at this time, so it needs to be adjusted to make it vibrate, so as to stop heating, so as to switch to another heat pipe for heating. Therefore, the heat pipes 16 and 17 are continuously and alternately heated according to the temperature, thereby forming the continuous vibration descaling and heat exchange of the heat pipes 16 and 17 .

By judging the stable state of the fluid according to the temperature difference or the accumulation of temperature difference changes, the results are more accurate, and there will be no increase in errors caused by aging caused by running time problems.

Preferably, if the temperature in the previous time period is T1, and the temperature in the adjacent subsequent time period is T2, if T1<T2, then when T2-T1 is lower than the threshold, the controller controls the valve to switch the heating heat pipe.

By judging the temperature successively, it is determined that the current heat source is in the heating state, so as to decide whether to switch the heat pipe according to different situations.

Preferably, if the temperature in the previous time period is T1, and the temperature in the adjacent subsequent time period is T2, if T1=T2, the heating is judged according to the following conditions:

If T1 is greater than the temperature of the first data, the controller controls the valve to switch the heat pipe for heating; wherein the first data is greater than the temperature of the phase-change fluid after the phase change occurs; preferably, the first data is the temperature at which the phase-change fluid is sufficiently phase-changed;

If T1 is less than or equal to the temperature of the second data, the controller controls the heat pipe to continue heating without switching the heat pipe, wherein the second data is less than or equal to the temperature at which the phase change fluid does not undergo a phase change.

The first data is the temperature data of the fully heated state, and the second data is the temperature data of no heating or just beginning of the heating. Through the above-mentioned judgment of the temperature, it is also to determine whether the current heat source is in a heating state or a non-heating state, so as to determine the operating state of the heat source according to different situations.

，当Y的值低于设定阈值时，控制器控制阀门是否切换热管加热。Preferably, the number of temperature sensing elements is n, and the difference D _i =T _i −Q _i-1 between the temperature T _i in the current time period and the temperature Q _i-1 in the previous time period is calculated in turn, and the n temperature differences D are calculated. _i for arithmetic cumulative summation

, when the value of Y is lower than the set threshold, the controller controls whether the valve switches the heat pipe heating.

Preferably, if Y>0, when the value is lower than the threshold, the controller controls the valve to switch the heat pipe for heating; if Y<0, when the value is lower than the threshold, the controller controls the heat pipe to continue heating without switching.

The current heating state of the heat source is determined by judging the successive temperatures, so as to determine the operating state of the heat pipe according to different situations.

As a preference, if Y=0, the heating is judged according to the following conditions:

If the arithmetic mean of _Ti is greater than the temperature of the first data, the controller controls the valve to switch the heat pipe for heating; wherein the first data is greater than the temperature of the phase-change fluid after the phase-change occurs; preferably, the temperature of the phase-change fluid is sufficiently phase-changed;

If the arithmetic mean of _Ti is less than the temperature of the second data, the controller controls not to switch the heat pipe heating, wherein the second data is less than or equal to the temperature at which the phase change fluid does not undergo a phase change.

The first data is the temperature data of the fully heated state, and the second data is the temperature data of no heating or just beginning of the heating. Through the above-mentioned judgment of the temperature, it is also to determine whether the current heat source is in a heating state or a non-heating state, so as to determine the operating state of the heat source according to different situations.

Preferably, the time period for measuring the temperature is 1-10 minutes, preferably 3-6 minutes, and more preferably 4 minutes.

Preferably, the threshold is 1-10 degrees Celsius, preferably 4 degrees Celsius.

Preferably, the temperature value may be an average temperature value over a period of time. It can also be the temperature at a certain moment in the time period. For example, it is preferred that both are the temperature at the end of the time period.

Preferably, the temperature sensing element is arranged in the upper left pipe 21 and/or the upper right pipe 22 .

Preferably, the temperature sensing elements are arranged in the upper left pipe 21 and the upper right pipe 22 . At this time, the average temperature of the two tube boxes can be selected as the adjustment data.

Preferably, the temperature sensing element is arranged at the free end of the left heat-releasing tube group and/or the right heat-releasing tube group. By setting it at the free end, the temperature change of the free end can be sensed, so as to achieve better control and regulation. At this time, the average temperature of the two heat-releasing tube groups can be selected as the adjustment data.

3. Self-adjusting vibration based on liquid level

Preferably, liquid level sensing elements are respectively arranged inside the evaporation parts of the heat pipes 16 and 17 to detect the liquid level of the fluid in the evaporation parts of the heat pipes 16 and 17. The liquid level sensing elements are connected with the controller for data connection. Sequentially extract the liquid level data, and obtain the accumulation of the liquid level difference or the change of the liquid level difference through the comparison of the liquid level data of the adjacent time periods. Controls whether the heat pipes 16 and 17 are heated by the flue gas.

The heat exchange steps of the heat pipe 16 and the heat pipe 17 are as follows:

1) The fifth valve 18 and the seventh valve 20 are opened, and the sixth valve 19 and the eighth valve 23 are closed, so that the flue gas enters the heat pipe 16 for heat exchange, and does not enter the heat pipe 17, so that the tube bundle in the heat pipe 16 vibrates, so as to achieve Enhance heat transfer and descaling purposes;

2) The liquid level difference detected by the liquid level sensing element in the heat pipe 16 or the accumulated liquid level difference change is lower than a certain value. At this time, the controller controls the sixth valve 19 and the eighth valve 23 to open, the fifth valve 18 and the seventh valve The valve 20 is closed, so that the flue gas enters the heat pipe 17 for heat exchange, and does not enter the heat pipe 16, so that the tube bundle in the heat pipe 17 is vibrated, so as to achieve the purpose of strengthening heat transfer and descaling;

3) When the liquid level difference detected by the liquid level sensing element in the heat pipe 17 or the accumulated liquid level difference change is lower than a certain value, the controller controls the fifth valve 18 and the seventh valve 20 to open, the sixth valve 19 and the eighth valve to open. 23 is closed, so that the flue gas enters the heat pipe 16 for heat exchange, and does not enter the heat pipe 17, so that the tube bundle in the heat pipe 16 is vibrated, so as to achieve the purpose of strengthening heat transfer and descaling.

Then, steps 2) and 3) are continuously repeated, so as to realize the alternate heating of the heat pipes 16 and 17 .

The liquid level difference detected by the liquid level sensing element or the accumulation of changes in the liquid level difference can satisfy a certain liquid level (such as the lower limit), the evaporation of the internal fluid basically reaches saturation, and the volume of the internal fluid also basically changes. In this case, the internal fluid is relatively stable, and the vibration of the tube bundle becomes worse at this time. Therefore, it is necessary to adjust it to make it vibrate, so as to stop heating, and then switch to another heat pipe for heating. Therefore, the heat pipes 16 and 17 are continuously heated alternately according to the liquid level, so as to form the continuous vibration descaling and heat exchange of the heat pipes 16 and 17 .

By judging the stable state of the fluid according to the liquid level difference or the accumulation of the liquid level difference changes, the results are more accurate, and the problem of error increase caused by aging caused by the problem of running time will not be increased.

Preferably, if the liquid level in the previous time period is L1, and the liquid level in the adjacent subsequent time period is L2, if L1>L2, then when L2-L1 is lower than the threshold, the controller controls the heat pipe switching.

The current heating state of the heat pipe is determined by judging the size of the liquid level successively, so as to determine the operating state of the heat source according to different situations.

Preferably, if the liquid level in the previous time period is L1, and the liquid level in the adjacent subsequent time period is L2, if L1=L2, the heating is judged according to the following conditions:

If L1 is less than the liquid level of the first data or L1 is 0, the controller controls the heat pipe to perform heating switching; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably, the first data is that the phase-change fluid is fully phase-changed liquid level;

If L1 is greater than or equal to the liquid level of the second data, the controller controls the heat pipe not to switch and continue heating, wherein the second data is less than or equal to the liquid level of the phase change fluid without phase change.

The first data is the liquid level data in a fully heated state, including the dried up liquid level, and the second data is the liquid level data without heating or at the beginning of heating. By judging the size of the liquid level above, it is also possible to determine whether the current heat source is in a heating state or a non-heating state, so as to determine the operating state of the heat source according to different situations.

，当Y的值低于设定阈值时，控制器控制热管是否进行切换。Preferably, the number of the liquid level sensing elements is n, and the difference D _i =L _i -Q _{i -1} between the liquid level Li in the current time period and the liquid level Q _i-1 in the previous time period is calculated in turn, and the n The liquid level difference D _i is arithmetically accumulated and summed

, when the value of Y is lower than the set threshold, the controller controls whether the heat pipe is switched.

Preferably, Y>0, when the value is lower than the threshold, the controller controls the heat pipes 16 and 17 to switch.

The current state of the heat source is determined by judging the size of the liquid level successively, so as to determine the operating state of the heat source according to different situations.

As a preference, if Y=0, the heating is judged according to the following conditions:

If the arithmetic _mean of Li is less than the liquid level of the first data or is 0, the controller controls the heat pipes 16 and 17 to switch; the first data is greater than the liquid level of the phase change fluid after the phase change; preferably the phase change fluid is sufficient Phase change liquid level;

If the arithmetic _mean of Li is greater than the liquid level of the second data, the controller controls the heat pipe not to switch, wherein the second data is less than or equal to the liquid level of the phase change fluid without phase change.

The first data is the liquid level data in a fully heated state, including the dried up liquid level, and the second data is the liquid level data without heating or at the beginning of heating. By judging the size of the liquid level above, it is also possible to determine whether the current heat source is in a heating state or a non-heating state, so as to determine the operating state of the heat source according to different situations.

Preferably, the time period for measuring the liquid level is 1-10 minutes, preferably 3-6 minutes, and more preferably 4 minutes.

Preferably, the threshold is 1-10 mm, preferably 4 mm.

Preferably, the water level value may be an average water level value within a period of time. It can also be the water position at a certain moment in the time period. For example, the water level at the end of the time period is preferably all.

4. Self-adjusting vibration based on speed

Preferably, speed sensing elements are arranged inside the free ends of the tube bundles of the heat pipes 16 and 17 for detecting the flow velocity of the fluid in the free ends of the tube bundles, the speed sensing elements are connected with the controller, and the controller extracts speed data according to time sequence, Through the comparison of the speed data of adjacent time periods, the speed difference or the accumulation of the change of the speed difference is obtained, and the controller controls whether the flue gas heats the heat pipes 16 and 17 according to the detected speed difference of the fluid or the accumulation of the change of the speed difference. .

The heat exchange steps of the heat pipe 16 and the heat pipe 17 are as follows:

1) The fifth valve 18 and the seventh valve 20 are opened, and the sixth valve 19 and the eighth valve 23 are closed, so that the flue gas enters the heat pipe 16 for heat exchange, and does not enter the heat pipe 17, so that the tube bundle in the heat pipe 16 vibrates, so as to achieve Enhance heat transfer and descaling purposes;

2) The speed difference detected by the speed sensing element in the heat pipe 16 or the accumulated speed difference change is lower than a certain value. At this time, the controller controls the sixth valve 19 and the eighth valve 23 to open, and the fifth valve 18 and the seventh valve 20 to close. , so that the flue gas enters the heat pipe 17 for heat exchange, and does not enter the heat pipe 16, so that the tube bundle in the heat pipe 17 vibrates, so as to achieve the purpose of strengthening heat transfer and descaling;

3) When the speed difference detected by the speed sensing element in the heat pipe 17 or the accumulated speed difference change is lower than a certain value, the controller controls the fifth valve 18 and the seventh valve 20 to open, and the sixth valve 19 and the eighth valve 23 to close. The flue gas enters the heat pipe 16 for heat exchange, and does not enter the heat pipe 17, so that the tube bundle in the heat pipe 16 vibrates, thereby achieving the purpose of strengthening heat transfer and descaling.

Then, steps 2) and 3) are continuously repeated, so as to realize the alternate heating of the heat pipes 16 and 17 .

The flow rate detected by the speed sensing element can be satisfied with a certain speed (such as the upper limit), the evaporation of the internal fluid basically reaches saturation, and the volume of the internal fluid basically changes little. In this case, the internal fluid is relatively Stable, the vibration of the tube bundle at this time is poor, so it is necessary to adjust and make it vibrate to stop heating and switch to another heat pipe for heating. Therefore, the heat pipes 16 and 17 are continuously and alternately heated according to the speed, thereby forming the continuous vibration descaling and heat exchange of the heat pipes 16 and 17 .

By judging the steady state of the fluid according to the speed difference or the accumulation of the speed difference changes, the results are more accurate, and the problem of error increase caused by aging caused by the running time problem will not be increased.

Preferably, if the speed of the previous time period is V1, and the speed of the adjacent later time period is V2, if V1<V2, the controller controls the heat pipes 16 and 17 to switch heating when the speed is lower than the threshold.

The current state of the heat pipe is determined by judging the magnitude of the speed successively, so as to determine the operating state of the heat pipe according to different situations.

Preferably, if the speed of the previous time period is V 1, and the speed of the adjacent later time period is V 2, if V1=V 2, the heating is judged according to the following conditions:

If V 1 is greater than the speed of the first data, the controller controls the heat pipes 16 and 17 to switch heating; wherein the first data is greater than the speed of the phase change fluid after the phase change occurs; preferably, the first data is the speed of the phase change fluid sufficient phase change;

If V 1 is less than or equal to the speed of the second data, the controller controls the heat pipes 16 and 17 not to switch heating, wherein the second data is less than or equal to the speed of the phase change fluid without phase change.

The first data is the speed data of the fully heated state, and the second data is the speed data of no heating or just beginning of the heating. Through the above-mentioned judgment of the speed, it is also to determine whether the current heat source is in a heating state or a non-heating state, so as to determine the operating state of the heat source according to different situations.

，当Y的值低于设定阈值时，控制器控制热管16、17是否切换加热。Preferably, the number of speed sensing elements is n, and the difference D _i =V _i −Q _i-1 between the speed V _i in the current time period and the speed Q _i-1 in the previous time period is calculated in turn, and the n speed differences D _i are calculated. Do an arithmetic cumulative sum

, when the value of Y is lower than the set threshold, the controller controls whether the heat pipes 16 and 17 are switched for heating.

Preferably, Y>0, when the value is lower than the threshold, the controller controls the heat pipes 16 and 17 to switch and heat.

The current heating state of the heat pipe is determined by judging the speed and magnitude successively, so as to determine the operating state of the heat source according to different situations.

As a preference, if Y=0, the heating is judged according to the following conditions:

If the arithmetic mean of V _i is greater than the speed of the first data, the controller controls the heat pipes 16, 17 to switch heating; wherein the first data is greater than the speed of the phase change fluid after the phase change; preferably the speed of the phase change fluid sufficient phase change;

If the arithmetic mean of V _i is less than the speed of the second data, the controller controls the heat pipes 16 and 17 not to switch heating, wherein the second data is less than or equal to the speed of the phase change fluid without phase change.

The first data is the speed data of the fully heated state, and the second data is the speed data of no heating or just beginning of the heating. Through the above-mentioned judgment of the speed, it is also to determine whether the current heat source is in a heating state or a non-heating state, so as to determine the operating state of the heat source according to different situations.

Preferably, the time period period for measuring the speed is 1-10 minutes, preferably 3-6 minutes, more preferably 4 minutes.

Preferably, the threshold is 1-3 m/s, preferably 2 m/s.

Preferably, the velocity value may be an average pressure value over a period of time. It can also be the speed at a certain moment in the time period. For example, it is preferred to be the speed at the end of the time period.

Preferably, the heat radiating tubes of the left heat radiating tube group are distributed with the axis of the left condenser tube as the center, and the heat radiating tubes of the right heat radiating tube group are distributed with the axis of the right condenser tube as the center. By setting the left and right condenser tubes as the center of the circle, the distribution of the heat release tubes can be better ensured, so that the vibration and heating are uniform.

Preferably, there are a plurality of the left heat-releasing tube groups and the right heat-releasing tube groups.

Preferably, the left heat-releasing tube group and the right heat-releasing tube group are mirror-symmetrical along a plane where the vertical axis of the evaporation part is located. By setting in this way, the distribution of the heat exchanging heat pipes can be made more reasonable and uniform, and the heat exchange effect can be improved.

Preferably, the evaporation part 8 has a flat tube structure. By arranging the flat tube structure, the heat absorption area is increased. This makes it possible to ensure that the evaporation part 8 is located at the focal position of the mirror even if the installation position is slightly deviated.

Preferably, the left heat radiation tube group 11 and the right heat radiation tube group 12 are staggered and distributed in the horizontal extending direction, as shown in FIG. 6 . By staggered distribution, it is possible to conduct vibration heat release and descaling on different lengths, making the vibration more uniform and enhancing the heat exchange and descaling effects.

Preferably, a plurality of first nozzles 10 and second nozzles 13 can be provided, for example, two are provided in FIG. 2 . By setting more than one, the speed at which the steam from the evaporation end enters the condensation end can be increased, and the utilization of waste heat can be accelerated.

Preferably, fluid channels 102 are included in which fluid flows. As shown in FIG. 3 , the evaporation part 8 is located at the lower end of the fluid channel, as shown in FIG. 3 . The left condenser tube 21 , the right condenser tube 22 , the left heat release tube group 11 and the right heat release tube group 12 are arranged in the fluid channel, and the fluid in the fluid channel is heated by exothermic heat.

Preferably, the flow direction of the fluid is the same as the direction in which the left condensing pipe 21 , the right condensing pipe 22 and the evaporation part 8 extend. With this arrangement, the fluid flushes the heat release tube group, especially the free end of the heat release tube group, so that the free end vibrates, thereby enhancing heat transfer and achieving the effect of descaling.

Preferably, along the flow direction of the fluid in the fluid channel, the heat release tube group 1 (for example, the same side (left or right)) is provided in multiples, and along the flow direction of the fluid in the fluid channel, the heat release tube groups 1 Group 1 (eg the same side (left or right)) has continuously larger diameters.

Along the flow direction of the fluid, the temperature of the fluid increases continuously, so that the heat exchange temperature difference decreases continuously, and the heat exchange capacity becomes larger and larger. By increasing the diameter of the heat release tube group, it can ensure that more steam enters the heat release tube group through the upper part, and ensures that the flow direction of the fluid is along the direction of the fluid. Because of the large amount of steam and the good vibration effect, the overall heat exchange is uniform. The distribution of steam in all the heat-releasing tube groups is even, which further strengthens the heat transfer effect, makes the overall vibration effect uniform, increases the heat transfer effect, and further improves the heat transfer effect and the descaling effect.

Preferably, along the flow direction of the fluid in the fluid channel, the diameter of the heat release tubes in the heat release tube group (for example, on the same side (left or right)) is continuously increased.

This arrangement prevents the fluids from exchanging heat at the front, and increases the heat exchange to the rear as much as possible, thereby forming a heat exchange effect similar to countercurrent. Through experiments, it is found that better heat exchange effect and descaling effect can be achieved by adopting this structural design.

Preferably, along the flow direction of the fluid in the fluid channel, the same side (left or right) heat release tube groups are arranged in multiples, and along the flow direction of the fluid in the fluid channel, the same side (left or right) Right) The distance between adjacent heat-releasing tube groups is getting smaller and smaller. The specific effect is similar to the effect of the previous pipe diameter change.

Preferably, along the flow direction of the fluid in the fluid channel, the distance between the heat radiating tube groups on the same side (left or right) is continuously decreasing and increasing continuously. The specific effect is similar to the effect of the previous pipe diameter change.

In the test, it was found that the pipe diameter and distance of the left condenser pipe 21 and the right condenser pipe 22 and the pipe diameter of the heat release pipe can affect the heat exchange efficiency and uniformity. If the distance between the headers is too large, the heat exchange efficiency will be too poor, and if the distance between the heat release tubes is too small, the heat release tubes will be distributed too densely, which will also affect the heat exchange efficiency. The volume of the liquid or steam contained will affect the vibration of the free end, thereby affecting the heat transfer. Therefore, there is a certain relationship between the pipe diameter and distance of the left condenser pipe 21 and the right condenser pipe 22 and the pipe diameter of the heat release pipe.

The present invention summarizes the optimal dimensional relationship through numerical simulation of a plurality of heat pipes of different sizes and experimental data. Starting from the maximum heat exchange in the heat exchange effect, nearly 200 forms have been calculated. The dimensional relationships described are as follows:

The distance between the center of the left condensing pipe 21 and the center of the right condensing pipe 22 is M, the diameter of the left condensing pipe 21 and the radius of the right condensing pipe 22 are the same, which is B, and the radius of the axis of the innermost heat-releasing pipe in the heat-releasing pipe is N1, and the radius of the axis of the outermost heat release pipe is W2, then the following requirements are met:

N1/W2=a*Ln(B/M)+b; where a, b are parameters, Ln is a logarithmic function, where 0.5788<a<0.6002, 1.6619<b<1.6623; preferably, a=0.5790, b= 1.6621.

Preferably, 35<B<61mm; 230<M<385mm; 69<N1<121mm, 119<W2<201mm.

Preferably, the number of the heat releasing tubes in the heat releasing tube group is 3 to 5, preferably 3 or 4.

Preferably, 0.55<N1/W2<0.62; 0.154<B/M<0.166.

Preferably, 0.57<N1/W2<0.61; 0.158<B/M<0.162.

Preferably, the angle A formed between the midpoint of the bottom of the evaporation box and the center of the left and right condenser tubes 21 and 22 is 40-100 degrees (angle), preferably 60 degrees (angle).

Preferably, the radius of the heat release pipe is preferably 10-40 mm; preferably 15-35 mm, more preferably 20-30 mm.

Preferably, the arc between the ends of the free ends 3 and 4 with the central axis of the left header as the center of the circle is 95-130 degrees, preferably 120 degrees. Similarly, the radians of the free ends 5 and 6 and the free ends 3 and 4 are the same. Through the above-mentioned preferred design of the included angle, the vibration of the free end can be optimized, so that the heating efficiency can be optimized.

Preferably, the tube bundles of the heat releasing tube group 1 are elastic tube bundles.

The heat transfer coefficient can be further improved by arranging elastic tube bundles in the tube bundles of the heat release tube group 1 .

There are multiple sets of heat radiating tubes 1 , and the multiple sets of heat radiating tubes 1 are in a parallel structure.

Preferably, the condensation end is arranged in the air channel. By heating the air channel, the heated air is directly used for boiler combustion.

Preferably, as shown in FIG. 5 , the heat pipe is arranged in the pipe 103 , and the circular pipe is divided into two parts, the upper part and the lower part, by the dividing wall 104 , the upper part is the air channel 102 , and the lower part is the flue gas channel 101 . Through the above arrangement, the heat pipe and the heat exchange fluid can be all arranged in the circular pipe, so that the external space can be fully utilized and the purpose of compact structure can be achieved.

Preferably, as shown in FIG. 5 , the cross-sectional area of the upper portion is 50-80% of the cross-sectional area of the lower portion, more preferably 60-70%. Through the above area distribution, the heat absorption and heat dissipation of the heat pipe can be uniformly coordinated.

Preferably, as shown in FIG. 5 , the air channel has a trapezoidal structure. The upper bottom of the trapezoidal structure is located at the upper part of the vertical part 101 , and the lower bottom is the upper wall surface of the flue gas channel. By arranging the new trapezoidal structure shown in FIG. 5 , the heat exchange efficiency can be further improved. As the vertical part of the heat pipe goes up, the vertical part of the heat pipe continuously participates in the heat exchange, so the lower part of the vertical part has the highest temperature. By setting the trapezoidal structure, the lower air flow can be increased and the upper air flow can be reduced to achieve uniform heat exchange. the goal of. Moreover, by arranging the trapezoidal structure, the external structure can be made compact, and the external space can be fully utilized. For example, other components, such as pipes, can be positioned at the waist of the trapezoidal structure.

Preferably, the upper base of the trapezoidal structure is 40-60% of the lower base, more preferably 50%.

Preferably, the trapezoid is an isosceles trapezoid.

Further preferably, the angle formed by the lower base of the trapezoid and the waist is 29-67°, preferably 40-50°.

Through the above structural optimization, the uniformity of heat exchange and the improvement of heat exchange efficiency can be achieved to the greatest extent.

Although the present invention has been disclosed above with preferred embodiments, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (1)

1. An internal circulation communication control heat pipe system comprises an air heater and a heat reservoir, wherein the air heater is arranged on a main pipeline of a flue, the heat reservoir is arranged on an auxiliary pipeline, and the main pipeline and the auxiliary pipeline form a parallel pipeline; the system comprises a third valve and a fourth valve, the third valve is arranged on a flue gas pipeline at the upstream of the air heater and the heat reservoir, the fourth valve is arranged on a flue gas pipeline at the downstream of the air heater and the heat reservoir, the system is also provided with a by-pass pipeline connected with a main pipeline of a flue, the connecting position of the by-pass pipeline and the main pipeline of the flue is positioned at the upstream of the third valve, and the by-pass pipeline is provided with a ninth valve;

the smoke detection device is characterized in that a smoke sensor is arranged in a smoke pipeline at the upstream of the third valve and used for detecting whether smoke flows through a flue; the smoke sensor is in data connection with the central controller, and the central controller controls the opening and closing of the third valve and the fourth valve according to data detected by the smoke sensor; the auxiliary pipeline is provided with a fan, the fan is in data connection with a central controller, and the central controller automatically controls the fan to operate according to data monitored by the smoke sensor;

when the central controller detects that no smoke passes through the pipeline, the central controller controls the third valve and the fourth valve to be closed, the ninth valve is opened, the central controller automatically controls the fan to start running, and the pipeline where the air heater and the heat reservoir are located forms a circulating pipeline; when the central controller detects that smoke passes through the pipeline, the central controller controls the ninth valve to be closed, controls the third valve and the fourth valve to be in an open state, and automatically controls the fan to stop running; the main flue gas pipeline comprises a first bypass pipeline and a second bypass pipeline, wherein a fifth valve and an air heater are respectively arranged on the first bypass pipeline, a first heat pipe is arranged in the air heater, and a sixth valve is arranged on the main flue gas pipeline corresponding to the first bypass pipeline; the second bypass pipeline is respectively provided with an eighth valve and a second air heater, a second heat pipe is arranged in the second air heater, and a seventh valve is arranged on the main flue gas pipeline corresponding to the second bypass pipeline;

the first heat pipe and the second heat pipe comprise an evaporation part and a condensation part, the condensation part comprises a left condensation pipe, a right condensation pipe and a heat release pipe group, the heat release pipe group comprises a left heat release pipe group and a right heat release pipe group, the left heat release pipe group is communicated with the left condensation pipe and the evaporation part, the right heat release pipe group is communicated with the right condensation pipe and the evaporation part, so that the evaporation part, the left condensation pipe, the right condensation pipe and the heat release pipe group form a heating fluid closed cycle, the evaporation part is filled with phase change fluid, each heat release pipe group comprises a plurality of heat release pipes in an arc shape, the end parts of the adjacent heat release pipes are communicated, the plurality of heat release pipes form a series structure, and the end parts of the heat release pipes form free ends of the heat release pipes; the evaporation part comprises a first pipe orifice and a second pipe orifice, the first pipe orifice is connected with the inlet of the left heat-releasing pipe group, the second pipe orifice is connected with the inlet of the right heat-releasing pipe group, the outlet of the left heat-releasing pipe group is connected with the left condensation pipe, and the outlet of the right heat-releasing pipe group is connected with the right condensation pipe; the first pipe orifice and the second pipe orifice are arranged on one side of the evaporation part; the evaporation part is an evaporation end of the heat pipe, the condensation part is a condensation end of the heat pipe, at least one part or all of the condensation part is arranged in the air channel, and the evaporation part is arranged in the smoke pipeline; a left return pipe is arranged between the left condensation pipe and the evaporation part, and a right return pipe is arranged between the right condensation pipe and the evaporation part; the evaporation part is arranged in the flue, and the condensation part heats the air in the air heater;

temperature sensing elements are arranged in the first heat pipe and the second heat pipe, the controller extracts temperature data according to a time sequence, the temperature difference or the accumulation of the temperature difference change is obtained through the comparison of the temperature data of adjacent time periods, and the controller controls whether the flue gas heats the first heat pipe and the second heat pipe according to the detected temperature difference or the accumulation of the temperature difference change;

the heating steps of the first heat pipe and the second heat pipe are as follows:

1) the fifth valve and the seventh valve are opened, and the sixth valve and the eighth valve are closed, so that the flue gas enters the first heat pipe for heat exchange and does not enter the second heat pipe, and the tube bundle in the first heat pipe is vibrated, thereby achieving the purposes of heat transfer enhancement and descaling;

2) the controller controls the sixth valve and the eighth valve to be opened, and the fifth valve and the seventh valve to be closed, so that the flue gas enters the second heat pipe for heat exchange and does not enter the first heat pipe, and the tube bundle in the second heat pipe vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;

3) when the temperature difference or the accumulated value of the temperature difference change detected by the temperature sensing element in the second heat pipe is lower than a certain value, the controller controls the fifth valve and the seventh valve to be opened, and the sixth valve and the eighth valve to be closed, so that the flue gas enters the first heat pipe for heat exchange and does not enter the second heat pipe, and the tube bundle in the first heat pipe vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;

and then continuously repeating the steps 2) and 3) so as to realize the alternate heating of the first heat pipe and the second heat pipe.

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