CN114593522B - A smoke temperature measurement cooperative control heat pipe system - Google Patents

Abstract

The invention provides a flue gas temperature measurement cooperative control heat pipe system. A fourth temperature sensor is arranged in the flue gas pipeline upstream of the third valve, and the fourth temperature sensor is used to detect the flue gas temperature in the flue; the fourth temperature sensor is connected to a central controller for data, and the central controller controls the opening and closing of the third valve and the fourth valve according to the data detected by the fourth temperature sensor. The present invention can store excess heat in the heat storage device when the flue gas temperature meets the requirements and the amount of hot air generated by the air heater is met, and use the heat stored in the waste heat of the flue gas to heat the air heater when there is no waste heat of the flue gas, so as to meet the actual working requirements of the air heater. In this way, the residual heat of the flue gas can be fully utilized to avoid excessive waste of heat.

Description

A smoke temperature measurement cooperative control heat pipe system

technical field

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

Background technique

Heat pipe technology is a heat transfer element called "heat pipe" invented by George Grover of the Los Alamos National Laboratory in the United States in 1963. It makes full use of the principle of heat conduction and the rapid heat transfer properties of phase change media, and quickly transfers the heat of the heating object to the heat source through the heat pipe.

Heat pipe technology was widely used in aerospace, military and other industries in the past. Since it was introduced into the radiator manufacturing industry, people have changed the design ideas of traditional radiators and got rid of the single heat dissipation mode that only relies on high air volume motors to obtain better heat dissipation effects. The use of heat pipe technology enables radiators to obtain satisfactory heat exchange effects, 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 waste heat utilization of power plants.

In the prior art, the shape of the heat pipe affects the heat-absorbing area of the evaporating end, so the heat-absorbing range of the evaporating end is generally relatively small, and sometimes multiple heat pipes need to be installed in the heat source to meet the heat-absorbing demand; and when there are multiple evaporating ends, each evaporating end will have uneven heat absorption due to the different positions of the heat source. In the prior art, the waste heat utilization heat pipe device always extends the condensation end to the outside of the pipe, which occupies an external area and makes the structure of the heat pipe waste heat utilization system not compact.

In addition, elastic vibrating tube bundles are widely used in waste heat heat exchange. In the application, it is found that continuous heating will lead to the stability of the fluid 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 a greatly weakened vibration performance of the coil, which affects the descaling of the coil and the heating efficiency.

However, in the application, it is found that the continuous waste heat heating will lead to the stability of the fluid in the internal loop heat pipe, that is, the fluid no longer flows or has little fluidity, or the flow is stable, resulting in a greatly weakened vibration performance of the coil, which affects the descaling of the coil and the heating efficiency.

In practice, it is found that if the vibration of the tube bundle is adjusted through fixed periodic changes, there will be hysteresis and the period will appear 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, thereby achieving good descaling and heating effects.

However, it has been found in practice that the above-mentioned waste heat utilization system lacks a control system, cannot realize automatic control, and requires high labor costs. In view of the above problems, the present invention improves on the previous invention, and provides a waste heat utilization system with a new structure, which makes full use of heat sources, reduces energy consumption, and realizes intelligent control.

Contents 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 to realize intelligent and full utilization of waste heat.

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

A smoke temperature measurement cooperative control heat pipe system, the system includes an air heater and a heat storage device, the air heater is arranged on the main pipe of the flue, the heat storage device is arranged on the auxiliary pipe, the main pipe and the auxiliary pipe form a parallel pipeline; the system includes a first valve and a second valve, 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, the fourth valve is arranged on the flue gas pipeline downstream of the air heater and the heat storage device, the second valve is arranged at the inlet of the air heater of the main flue, and the first valve is set At the position of the inlet pipe of the heat accumulator of the auxiliary 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 ninth valve is arranged on the bypass pipeline;

The first valve, the second valve and the ninth valve are opened, and the third valve and the fourth valve are closed. When the central controller detects that flue gas passes through the flue gas pipeline, the central controller controls the ninth valve to close, and controls the third valve and the fourth valve to be in an open state; it is characterized in that a fourth temperature sensor is installed in the flue gas pipeline upstream of the third valve, and the fourth temperature sensor is used to detect the flue gas temperature in the flue; the fourth temperature sensor is connected to the central controller for data, and the central controller controls the opening and closing of the third valve and the fourth valve according to the data detected by the fourth temperature sensor.

Preferably, when the central controller detects that the temperature of the flue gas in the flue gas pipeline exceeds a certain temperature, the central controller controls the third valve and the fourth valve to open, so that the flue gas can enter the air heater and the heat storage device, and exhaust the smoke after the heat exchange is completed.

Preferably, when the central controller detects that the temperature of the flue gas in the flue gas pipeline is lower than a certain temperature, the central controller controls the third valve and the fourth valve to close, and the pipeline where the air heater and heat storage are located forms a circulation pipeline.

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

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

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

A temperature sensing element is set inside the first heat pipe and the second heat pipe, the controller extracts the temperature data according to the time sequence, and obtains the temperature difference or the accumulation of the temperature difference change by comparing 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, 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, thereby achieving the purpose of enhancing heat transfer and descaling;

2) The temperature difference detected by the temperature sensing element in the first heat pipe or the cumulative 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 flue gas enters the second heat pipe for heat exchange and does not enter the first heat pipe, so that the tube bundle in the second heat pipe vibrates, thereby achieving the purpose of enhancing heat transfer and descaling;

3) When the temperature difference detected by the temperature sensing element in the second heat pipe or the cumulative temperature difference change is lower than a certain value, the controller controls the fifth valve and the seventh valve to open, the sixth valve and the eighth valve to close, 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, thereby achieving the purpose of enhancing heat transfer and descaling;

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

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 release pipe group, the heat radiating pipe group includes a left radiating pipe group and a right radiating pipe group, the left radiating pipe group is connected with the left condensing pipe and the evaporating part, and the right heat releasing pipe group is connected with the right condensing pipe and the evaporating part, so that the evaporating part, the left condensing pipe, the right condensing pipe and the radiating pipe group form a closed loop of heating fluid, and the evaporating part is filled with phase change fluid, and each radiating pipe group includes an arc The ends of the adjacent heat release pipes are connected, so that the plurality of heat release pipes form a series structure, and the ends of the heat release pipes form the free ends of the heat release pipes; the evaporation part includes a first nozzle and a second nozzle. The condensing part is the condensing end of the heat pipe. At least a part or all of the condensing part is arranged in the air channel, and the evaporating part is arranged in the flue gas pipe; a left return pipe is arranged between the left condensing pipe and the evaporating part, and a right reflux pipe is arranged between the right condensing pipe and the evaporating part. The evaporating part is arranged in the flue, and the condensing part heats the air in the air heater.

Preferably, the left heat release tube group and the right heat release tube group are symmetrical along the middle position of the evaporator.

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. The present invention can store excess heat in the heat storage when there is flue gas and satisfy the amount of hot air generated by the air heater, and use the heat stored in the residual heat of flue gas to heat the air heater when there is no residual heat of flue gas, so as to meet the actual working requirements of the air heater. In this way, the residual heat of the flue gas can be fully utilized to avoid excessive waste of heat.

2. The present invention detects the temperature difference or the cumulative temperature difference through the temperature sensing element. When a certain temperature difference is satisfied, the evaporation of the internal fluid basically reaches saturation, and the volume of the internal fluid basically does not change much. In this case, the internal fluid is relatively stable, and the vibration of the tube bundle at this time becomes worse. Therefore, it needs to be adjusted to make it vibrate, thereby stopping heating, and then switching to another heat pipe for heating. Thus, according to the temperature, the heat pipes are continuously heated alternately, thereby forming constant vibration descaling and heat exchange of the heat pipes.

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

4. In the present invention, the heat exchange efficiency can be further improved by setting the pipe diameter and spacing distribution of the heat release tube group in the direction of fluid flow.

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

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

Fig. 5 is a schematic structural diagram of a flue gas waste heat utilization device provided with a bypass pipe.

Detailed ways

The specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

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

A flue gas monitoring heat pipe system, the system is provided with sequentially connected tubular superheaters, heat pipe evaporators and heat pipe economizers, the tubular superheaters are connected to high-temperature flue gas, and the heat pipe economizers are connected to water supply terminals. As shown in FIG. 1 , a waste heat utilization system includes an air heater 31 and a heat storage 32 , the air heater 31 is arranged on the main pipe 42 of the flue, and the air heater 31 absorbs waste heat of flue gas to generate hot air. The heat accumulator 32 is arranged on the secondary pipeline 43, and the main pipeline 42 and the secondary pipeline 43 form a parallel pipeline. The flue gas in the flue enters the air heater 31 and the heat accumulator 32 of the main pipe 42 and the auxiliary pipe 43 respectively, generates hot air in the air heater 31, stores heat in the heat accumulator 32, and the flue gas after heat exchange in the air heater 31 and the heat accumulator 32 flows into the main flue again.

In the above system, while hot air is generated by waste heat of flue gas, heat storage can be used for heat storage.

As a preference, the system can only be provided with the air heater 31 without the auxiliary pipeline.

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

As shown in Figure 1, described system comprises first valve 34 and second valve 35, the 3rd valve 36 and the 4th valve 37, and the 3rd valve 36 is arranged on the flue gas pipeline of air heater 31 and heat accumulator 32 upstream, is used to control the total flue gas flow that enters air heater 31 and heat accumulator 32, and the 4th valve 37 is arranged on the flue gas pipeline of air heater 31 and heat accumulator 32 downstream, and second valve 35 is arranged at the position of the inlet of air heater 31 of main flue 42, is used to control the flow that enters air heater 31 For the flow rate of the flue gas, the first valve 34 is arranged at the position of the inlet pipe of the heat accumulator 32 of the auxiliary pipeline 43, and is used to control the flow rate of the flue gas entering the heat accumulator 32. The system also includes a central controller, and the central controller is connected to the first valve 34, the second valve 35, the third valve 36, and the fourth valve 37 for data. 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 as well as 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. 5 , the system is also provided with a bypass pipe connected to the main pipe 42 of the flue, the connection position of the bypass pipe and the main pipe 42 of the flue is located upstream of the third valve 36, and the ninth valve 45 is arranged on the bypass pipe. The ninth valve 45 is in data connection with 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 storage 32 .

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

Fig. 3 discloses a schematic structural diagram of the flue gas pipeline in which the air heater of the present invention is located. As shown in FIG. 3 , the flue gas main 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 18 and an air heater 31 are respectively arranged on the first bypass pipeline, a heat pipe 16 is arranged in the air heater 31, and a sixth valve 19 is arranged on the flue gas main pipeline 42 corresponding to the first bypass pipeline. 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 flue gas main 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, 16 for waste heat utilization.

Preferably, the first bypass pipeline and the second bypass pipeline are located on the same side of the flue gas main 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 vibrating tube bundle heat pipe, the structure is as shown in Figure 4, the heat pipes 16, 17 which are arranged in the flue and utilize the flue waste heat device, the heat pipe includes an evaporation part 8 and a condensation part, the condensation part includes a left condensation pipe 21, a right condensation pipe 22 and a heat radiation pipe group 1, and the heat radiation pipe group 1 includes a left heat radiation pipe group 11 and a right heat radiation pipe group 12, the left heat radiation pipe group 11 communicates with the left condensation pipe 21 and the evaporation part 8, and the right heat radiation pipe group 1 2 communicates with the right condensing pipe 22 and the evaporating part 8, so that the evaporating part 8, the left condensing pipe 21, the right condensing pipe 22 and the radiating tube group 1 form a closed loop of heating fluid, and the evaporating part 8 is filled with a phase change fluid. 3. The first nozzle 10 is connected to the inlet of the left heat radiation tube group 11, the second nozzle 13 is connected to the inlet of the right heat radiation tube group 12, the outlet of the left heat radiation tube group 11 is connected to the left condensation pipe 21, and the outlet of the right heat radiation tube group 12 is connected to the right condensation pipe 22; the first nozzle 10 and the second nozzle 13 are arranged on the evaporation part 8 side. 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.

Wherein 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 condensing part is arranged in the air passage, and the evaporating part 8 is arranged in the flue gas pipe.

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, then the fluid in the evaporating end 8 evaporates, enters the condensation part through the first nozzle 10 and the second nozzle 13, and then releases heat to the air in the air heater 31 in the condensation part, the fluid condenses, and then enters the evaporation end by gravity.

The invention improves the structure of the condensing end of the heat pipe, and increases the heat absorption area of the evaporating end of the heat pipe without changing the volume of the condensing end of the heat pipe, thus expanding the heat release range of the heat pipe. Compared with the heat pipe evaporating end and condensing end in the prior art keeping the same size, the heat exchange efficiency can be increased 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 condensation pipe 21 , the right condensation pipe 22 and the evaporator 8 extend along the horizontal direction.

Preferably, a plurality of radiating tube groups 1 are provided along the horizontal extension of the left condensing tube 21 , the right condensing tube 22 and the evaporator 8 , and the radiating tube groups 1 are connected in parallel.

Preferably, a left return pipe is provided between the left condensation pipe 21 and the evaporation part 8 , and a right return pipe is provided between the right condensation pipe 22 and the evaporation part 8 . Preferably, the return pipe is 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 along the heat release tube bundle to the left condenser pipe 21 and the right condenser pipe 22. After being heated, the fluid will expand in volume to form steam, and the volume of steam is much larger than that of water, so the formed steam will flow rapidly and impulsively in the coil. Because of the volume expansion and the flow of steam, the free end of the heat release 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 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 pipes, it flows back to the evaporation part through the return pipe.

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 area of heat exchange vibration, the more uniform the vibration, the more uniform the heat exchange effect, increasing the heat exchange area, and strengthening the heat exchange and descaling effects.

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

Preferably, a flue gas sensor is provided in the flue gas pipeline upstream of the third valve 36, and the flue gas sensor is used to detect whether there is flue gas flowing through the 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 36 and the fourth valve according to the data detected by the smoke sensor.

When the central controller detects that there is flue gas passing through the flue gas pipeline, for example, when the boiler is running, the central controller controls the third valve 36 and the fourth valve 37 to be in an open state, and the flue gas can enter the air heater 31 and the heat storage device 32, and exhaust the smoke after the heat exchange is completed. When the central controller detects that there is no flue gas passing through the flue gas pipeline, such as 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 storage device 32 are located forms a circulation pipeline. At this time, the air heater 31 is heated by the heat stored in the heat accumulator 32 to generate hot air. Through the above-mentioned operation, when there is flue gas, the excess heat can be stored in the heat storage device 32 under the condition that the amount of hot air generated by the air heater 31 is satisfied; when there is no residual heat of flue gas, the heat stored by the residual heat of the flue gas can be used to heat the air heater 31 to meet the actual working requirements of the air heater 31. In this way, the residual heat of the flue gas can be fully utilized to avoid excessive waste of heat.

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 fan in the closed circulation system according to the flue gas flow

As a preference, a fan is provided on the auxiliary pipe 43, so that the pipeline where the air heater 31 and the heat storage 32 are located forms a circulation pipeline through the operation of the fan when there is no waste heat of the flue gas.

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

When the central controller detects that there is smoke 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 operation of the fan 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 dual temperature detection

Preferably, a first temperature sensor is arranged in the heat storage 32 for detecting the temperature of the heat storage material in the heat storage. 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.

By controlling the operation of the fan through the detected temperature, the air heater can be heated independently. Because it is found in the research and development and experiment process that when the heat of the heat storage is gradually used up, the temperature of the gas coming out of the heat storage will be lower than the temperature of the air in the air heater 31. In this case, it is impossible to use the heat storage to heat the air heater, which 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 storage device 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 flue gas temperature at the inlet of the air heater

Preferably, the third temperature sensor is arranged at 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 in data connection with the central controller, and the central controller automatically controls the valve opening degrees 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 opening of the valve 35 to increase, and simultaneously controls the opening of the valve 34 to increase the flow of flue gas entering the air heater 31 . 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, so as to reduce the flow of hot air entering the air heater 31 .

When the temperature measured by the third temperature sensor is lower than a certain temperature, the ability of the air heater 31 to generate hot air will become worse and cannot meet normal needs, so more flue gas is needed to heat the air heater to generate hot air.

Through the above operation, when the temperature of the flue gas is high, after meeting the demand for hot air generation, the excess heat can be stored through the heat storage device. When the temperature of the flue gas is low, more flue gas can be entered into the air heater to generate hot air, ensuring the demand for hot air and saving 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 upstream of the third valve 36, and the fourth temperature sensor is used to detect the flue gas temperature in the flue. The fourth temperature sensor is in data connection 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 pipeline exceeds a certain temperature, for example, the boiler starts to discharge high-temperature flue gas when it is running, the central controller controls the third valve 36 and the fourth valve 37 to be in an open state, and the flue gas can enter the air heater 31 and the heat storage device 32, and exhaust the smoke after the heat exchange is completed. When the central controller detects that the temperature of the flue gas in the flue gas pipeline is lower than a certain temperature, such as when the boiler stops running, or the flue gas temperature is low due to the use of waste heat in the front, in order to avoid low-temperature corrosion or the waste heat cannot be utilized, the central controller controls the closing of the third valve 36 and the fourth valve 37, and the pipeline where the air heater 31 and the heat storage device 32 are located forms a circulation pipeline. At this time, the air heater 31 is heated by the heat stored in the heat accumulator 32 to generate hot air. Through the above operation, when the temperature of the flue gas meets the requirements, and the amount of hot air generated by the air heater 31 is met, the excess heat can be stored in the heat storage device 32, and when there is no waste heat of the flue gas, the heat stored by the waste heat of the flue gas can be used to heat the air heater 31, so as to meet the actual working requirements of the air heater 31. In this way, the residual heat of the flue gas can be fully utilized to avoid excessive waste of heat.

Preferably, when the smoke sensor detects that the temperature exceeds a certain level, 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 fan in the closed circulation system according to the flue gas flow

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

As a preference, a fan is provided on the secondary pipeline 43, and when the temperature of the flue gas in the flue 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 to the central controller for data, and the central controller automatically controls the operation of the fan according to the data monitored by the flue gas 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 storage 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 flue gas temperature at this time does not meet the heat exchange requirement, the heat storage device 32 needs to be used to heat the air heater. By controlling the intelligent operation of the fan according to the flue gas temperature, the intelligent control of the fan operation can be realized according to the actual situation, which improves the intelligence of the system.

When the central controller detects that the temperature of the flue gas 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 is opened.

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

Preferably, the outlet of the heat storage 32 is provided with a first temperature sensor for detecting the temperature of the gas at the outlet of the heat storage. 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, so that the air heater can be independently heated. Because it is found in the research and development and experiment process that when the heat of the heat storage is gradually used up, the temperature of the gas coming out of the heat storage will be lower than the temperature of the air in the air heater 31. In this case, it is impossible to use the heat storage to heat the air heater, which 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 storage device 32 and the air heater 31 is intelligently controlled, and the generation rate of hot air is improved.

In practical application, it is found that continuous heating will lead to the stability of the fluid 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 a greatly weakened vibration performance of the coil, which affects the descaling of the coil and the efficiency of heating.

In the previous application of the present applicant, a periodic heating method is proposed, which continuously promotes the vibration of the coil, thereby improving the heating efficiency and descaling effect. However, if the vibration of the tube bundle is adjusted through fixed periodic changes, there will be hysteresis and the period will appear 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, thereby achieving good descaling and heating effects.

The invention aims at the deficiencies in the previously researched technologies, and 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 into two air heaters 31 and heats the air through the heat pipes 16,17. When the air heater 31 is normally heating the air, take the following control mode:

1. Self-regulating vibration based on pressure

Preferably, a pressure sensing element is provided inside the loop heat pipe 16, 17 to detect the pressure inside the electric heating device. The pressure sensing element is connected to the controller for data. The controller extracts the pressure data according to the time sequence, and obtains the pressure difference or the accumulation of the pressure difference change through the comparison of the pressure data of adjacent time periods. The controller controls whether the flue gas heats the heat pipes 16, 17 according to the detected pressure difference or the accumulation of the pressure difference change.

Heat pipe 16 and heat pipe 17 carry out heat exchange steps as follows:

1) The fifth valve 18 and the seventh valve 20 are opened, 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, thereby achieving the purpose of enhancing heat transfer and descaling;

2) The pressure difference detected by the pressure sensing element in the heat pipe 16 or the cumulative 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, thereby achieving the purpose of enhancing heat transfer and descaling;

3) When the pressure difference detected by the pressure sensing element in the heat pipe 17 or the accumulation of the pressure 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 23 to close, 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, thereby achieving the purpose of enhancing heat transfer and descaling.

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

Through the pressure difference or cumulative pressure difference before and after the detection of 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 not changed much. In this case, the internal fluid is relatively stable. At this time, the vibration of the tube bundle becomes worse, so it needs to be adjusted to make it vibrate, thereby stopping heating, and then switching to another heat pipe for heating. Therefore, according to the pressure, the heat pipes 16 and 17 are continuously heated alternately, thereby forming constant vibration descaling and heat exchange of the heat pipes 16 and 17 .

By judging the steady state of the fluid based on the pressure difference or the accumulation of pressure difference changes, the result is more accurate, and there is no problem of error increase due to aging caused by the running time problem.

Preferably, during the heat exchange process of the heat pipe 16 or the heat pipe 17, if the pressure of the previous time period is P1, the pressure of the adjacent subsequent time period is P2, and if P1<P2, then when 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.

It is determined that the current heat pipe is in a heating state by successively judging the pressure, 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, then judge the heating 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; preferably the first data is the pressure of the phase change fluid for 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 at which the phase change fluid does not undergo 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 the beginning of heating. Through the judgment of the above pressure, it is also determined 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, there are n pressure sensing elements, 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 sequentially calculated, and the arithmetic cumulative summation is performed on the n pressure differences D _i , when the value of Y is lower than the set threshold, the controller controls whether the valve switches to heat the heat pipe.

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

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

As a preference, if Y=0, then judge the heating 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; preferably the pressure of the phase change fluid sufficient 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 at which the phase change fluid does not undergo 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 the beginning of heating. Through the judgment of the above pressure, it is also determined 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 pressure is 1-10 minutes, preferably 3-6 minutes, more preferably 4 minutes.

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

Preferably, the pressure value may be an average pressure value within a period of time. It can also be stress at a certain moment in time. For example, preferably both are the pressures 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 point, the average pressure of the two pipe boxes can be selected as the adjustment data.

Preferably, the pressure sensing element is arranged at the free end of the left heat release tube group and/or the right heat release tube group. By being set at the free end, the pressure change at the free end can be sensed, so as to achieve better control and adjustment. At this point, the average pressure of the two exothermic tube groups can be selected as the adjustment data.

2. Self-adjusting vibration based on temperature

Preferably, a temperature sensing element is provided inside the loop heat pipe 16, 17 to detect the temperature inside the electric heating device. The temperature sensing element is connected to the controller for data connection. The controller extracts the temperature data according to the time sequence, and obtains the temperature difference or the accumulation of the temperature difference change through the comparison of the temperature data of adjacent time periods. The controller controls whether the flue gas heats the heat pipes 16, 17 according to the detected temperature difference or the accumulation of the temperature difference change.

Heat pipe 16 and heat pipe 17 carry out heat exchange steps as follows:

1) The fifth valve 18 and the seventh valve 20 are opened, 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, thereby achieving the purpose of enhancing heat transfer and descaling;

2) The temperature difference detected by the temperature sensing element in the heat pipe 16 or the cumulative 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, thereby achieving the purpose of enhancing heat transfer and descaling;

3) When the temperature difference detected by the temperature sensing element in the heat pipe 17 or the cumulative temperature 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 23 to close, 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, thereby achieving the purpose of enhancing heat transfer and descaling.

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

Through the temperature difference detected by the temperature sensing element or the accumulation of temperature difference changes, when a certain temperature is satisfied, the evaporation of the internal fluid basically reaches saturation, and the volume of the internal fluid basically does not change much. In this case, the internal fluid is relatively stable. At this time, the vibration of the tube bundle becomes poor, so it needs to be adjusted to make it vibrate, thereby stopping heating, and then switching to another heat pipe for heating. Therefore, the heat pipes 16 and 17 are continuously heated alternately according to the temperature, thereby forming constant vibration descaling and heat exchange of the heat pipes 16 and 17 .

By judging the steady state of the fluid based on the temperature difference or the accumulation of temperature difference changes, the result is more accurate, and there is no problem of error increase due to aging caused by the running time problem.

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 value, the controller controls the valve to switch to heat the heat pipe.

Through successive temperature judgments, it is determined that the current heat source is in a heating state, so as to decide whether to switch the heat pipe according to different situations.

As a preference, if the temperature in the previous time period is T1, and the temperature in the subsequent time period is T2, if T1=T2, then judge the heating 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 after the phase change fluid occurs; preferably the first data is the temperature at which the phase change fluid is fully 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 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 the beginning of heating. Through the judgment of the above-mentioned temperature, it is also determined 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, there are n temperature sensing elements, 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 sequentially, and the arithmetic cumulative summation is performed on the n temperature differences D _i , when the value of Y is lower than the set threshold, the controller controls whether the valve switches the heat pipe for heating.

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

The current heating state of the heat source is determined through successive temperature judgments, so as to determine the operating state of the heat pipe according to different situations.

As a preference, if Y=0, then judge the heating according to the following conditions:

If the arithmetic mean of T _i 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 after the phase change of the phase change fluid; preferably the temperature at which the phase change fluid is fully phase changed;

If the arithmetic mean of T _i is less than the temperature of the second data, the controller controls not to switch the heat pipe for heating, wherein the second data is less than or equal to the temperature at which the phase change fluid does not undergo 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 the beginning of heating. Through the judgment of the above-mentioned temperature, it is also determined 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 temperature measurement is 1-10 minutes, preferably 3-6 minutes, 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 within a period of time. It can also be the temperature at a certain moment in the time period. For example, preferably both are the temperatures 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 point, 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 release tube group and/or the right heat release tube group. By being set at the free end, the temperature change at the free end can be sensed, thereby achieving better control and regulation. At this time, the average temperature of the two exothermic tube groups can be selected as the adjustment data.

3. Automatically adjust the vibration based on the liquid level

Preferably, liquid level sensing elements are arranged inside the evaporating parts of the heat pipes 16 and 17 to detect the liquid level of the fluid in the evaporating parts of the heat pipes 16 and 17. The liquid level sensing elements are connected to the controller for data connection. The controller extracts the liquid level data according to the time sequence, and obtains the liquid level difference or the accumulation of the liquid level difference changes by comparing the liquid level data of adjacent time periods.

Heat pipe 16 and heat pipe 17 carry out heat exchange steps as follows:

1) The fifth valve 18 and the seventh valve 20 are opened, 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, thereby achieving the purpose of enhancing heat transfer and descaling;

2) The liquid level difference detected by the liquid level sensing element in the heat pipe 16 or the accumulation of liquid level difference changes 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, thereby achieving the purpose of enhancing heat transfer and descaling;

3) When the liquid level difference detected by the liquid level sensing element in the heat pipe 17 or the accumulation of liquid level difference changes 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, 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, thereby achieving the purpose of enhancing heat transfer and descaling.

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

The liquid level difference detected by the liquid level sensing element or the accumulation of liquid level difference changes can satisfy a certain liquid level (such as the minimum lower limit), the evaporation of the internal fluid is basically saturated, and the volume of the internal fluid is basically not changed. In this case, the internal fluid is relatively stable, and the vibration of the tube bundle at this time becomes poor, so it needs to be adjusted to make it vibrate, thereby stopping heating, and then switching to another heat pipe for heating. Therefore, the heat pipes 16 and 17 are continuously alternately heated according to the liquid level, thereby forming constant vibration descaling and heat exchange of the heat pipes 16 and 17 .

By judging the steady state of the fluid based on the liquid level difference or the accumulation of the liquid level difference changes, the result is more accurate, and there will be no error increase due to aging caused by the running time problem.

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 to switch.

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

As a preference, 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 judge the heating 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 the liquid level of the full phase change of the phase change fluid;

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 the fully heated state, including the dry liquid level, and the second data is the liquid level data without heating or at the beginning of heating. Through the judgment of the above-mentioned liquid level, it is also determined 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, there are n liquid level sensing elements, and the difference D _i =L _i -Q _i-1 between the liquid level L _i in the current time period and the liquid level Q _i-1 in the previous time period is sequentially calculated, and the arithmetic cumulative summation is performed on the n liquid level differences D _i , when the value of Y is lower than the set threshold, the controller controls whether to switch the heat pipe.

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

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

As a preference, if Y=0, then judge the heating according to the following conditions:

If the arithmetic mean of L _i is less than the liquid level of the first data or is 0, the controller controls the heat pipes 16, 17 to switch; wherein the first data is greater than the liquid level after the phase change of the phase change fluid; preferably the liquid level of the full phase change of the phase change fluid;

If the arithmetic mean of L _i 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 the fully heated state, including the dry liquid level, and the second data is the liquid level data without heating or at the beginning of heating. Through the judgment of the above-mentioned liquid level, it is also determined 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, 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, preferably both are the water levels at the end of the time period.

4. Automatically adjust vibration based on speed

Preferably, the free ends of the tube bundles of the heat pipes 16 and 17 are provided with speed sensing elements inside to detect the flow velocity of the fluid in the free ends of the tube bundles. The speed sensing elements are connected to the controller for data connection. The controller extracts the speed data according to the time sequence, and obtains the speed difference or the accumulation of the speed difference changes by comparing the speed data of adjacent time periods. The controller controls whether the flue gas heats the heat pipes 16 and 17 according to the detected fluid speed differences or the accumulation of the speed difference changes.

Heat pipe 16 and heat pipe 17 carry out heat exchange steps as follows:

1) The fifth valve 18 and the seventh valve 20 are opened, 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, thereby achieving the purpose of enhancing heat transfer and descaling;

2) The speed difference detected by the speed sensing element in the heat pipe 16 or the cumulative 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, thereby achieving the purpose of enhancing heat transfer and descaling;

3) When the speed difference detected by the speed sensing element in the heat pipe 17 or the accumulation of speed difference changes 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, 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, thereby achieving the purpose of enhancing heat transfer and descaling.

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

The flow rate detected by the speed sensing element can meet a certain speed (such as the upper limit), the evaporation of the internal fluid is basically saturated, and the volume of the internal fluid basically does not change much. In this case, the internal fluid is relatively stable. At this time, the vibration of the tube bundle becomes poor, so it needs to be adjusted to make it vibrate, so as to stop heating, and then switch to another heat pipe for heating. Therefore, according to the speed, the heat pipes 16 and 17 are continuously heated alternately, thereby forming the constant vibration descaling and heat exchange of the heat pipes 16 and 17 .

By judging the steady state of the fluid based on the speed difference or the accumulation of speed difference changes, the result is more accurate, and there is no problem of error increase due to aging caused by the running time problem.

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

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

As a preference, if the speed of the previous time period is V1, the speed of the adjacent subsequent time period is V2, if V1=V2, then judge the heating according to the following conditions:

If V 1 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 after the phase change of the phase change fluid; preferably the first data is the speed of the full phase change of the phase change fluid;

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 the beginning of heating. Through the judgment of the above speed, it is also determined 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, there are n speed sensing elements, and the difference D _i =V _i -Q _i-1 between the current time period speed V _i and the previous time speed Q _i-1 is sequentially calculated, and the arithmetic cumulative summation is performed on the n speed differences D _i , when the value of Y is lower than the set threshold, the controller controls whether the heat pipes 16, 17 switch to heat.

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

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

As a preference, if Y=0, then judge the heating according to the following conditions:

If the arithmetic mean of _Vi 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 after the phase change of the phase change fluid; preferably the speed of the full phase change of the phase change fluid;

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 at which the phase change fluid does not undergo 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 the beginning of heating. Through the judgment of the above speed, it is also determined 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 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, preferably both are speeds at the end of the time period.

Preferably, the radiating tubes of the left radiating tube group are distributed with the axis of the left condensing tube as the center of the circle, and the radiating tubes of the right radiating tube group are distributed with the axis of the right condensing tube as the center of the circle. 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 even.

Preferably, there are multiple left heat release tube groups and right heat release tube groups.

Preferably, the left heat radiation tube group and the right heat radiation tube group are mirror-symmetrical along the plane where the vertical axis of the evaporating part is located. By setting in this way, the distribution of the heat release tubes for heat exchange can be made more reasonable and uniform, and the heat exchange effect can be improved.

Preferably, the evaporation part 8 is a flat tube structure. The heat absorption area is increased by setting the flat tube structure. This makes it possible to ensure that the evaporating portion 8 is located at the focal point of the reflector even if the installation position deviates a little.

Preferably, the left heat release tube group 11 and the right heat release tube group 12 are arranged in a staggered manner along the horizontal extension direction. Through the staggered distribution, vibration heat release and descaling can be performed at different lengths, making the vibration more uniform and enhancing the effect of heat exchange and descaling.

As a preference, multiple first orifices 10 and second orifices 13 can be provided, for example, two are provided in FIG. 2 . By arranging multiple, the speed at which steam from the evaporating end enters the condensing end can be increased, and the utilization of waste heat can be accelerated.

Advantageously, a fluid channel is included, and the fluid flows in the fluid channel. 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 condensing pipe 21, the right condensing pipe 22, the left heat releasing pipe group 11 and the right heat releasing pipe group 12 are arranged in the fluid channel, and the fluid in the fluid channel is heated by releasing heat.

Preferably, the flow direction of the fluid is the same as the direction in which the left condensation pipe 21 , the right condensation pipe 22 and the evaporator 8 extend. With such an arrangement, the fluid scours the heat release tube group, especially the free end of the heat release tube group when flowing, 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, multiple heat release tube groups 1 (for example, on the same side (left or right)) are provided, and along the flow direction of the fluid in the fluid channel, the diameter of the heat release tube group 1 (for example, on the same side (left or right)) is constantly increasing.

Along the flow direction of the fluid, the temperature of the fluid is continuously increased, so that the heat transfer temperature difference is continuously reduced, and the heat transfer capacity is getting larger and larger. By enlarging the pipe diameter of the heat release tube group, more steam can be ensured to enter the heat release tube group through the upper part, and to ensure along the fluid flow direction, because of the large steam volume and good vibration effect, so that the overall heat exchange is uniform. The distribution of steam in all heat release tube groups is even, which further enhances the heat transfer effect, makes the overall vibration effect uniform, increases the heat transfer effect, and further improves the heat transfer effect and descaling effect.

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

By setting in this way, the heat exchange of the fluid at the front is avoided, and the heat exchange is increased to the rear as much as possible, thereby forming a heat exchange effect similar to countercurrent. It is found through experiments that adopting this structural design can achieve better heat exchange effect and descaling effect.

Preferably, along the flow direction of the fluid in the fluid channel, there are multiple heat release tube groups on the same side (left or right), and along the flow direction of the fluid in the fluid channel, the distance between adjacent heat release tube groups on the same side (left or right) is continuously reduced. The specific effect is similar to the effect of pipe diameter change above.

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

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, so the protection scope of the present invention should be based on the scope defined in the claims.

Claims (5)

1. A smoke temperature measurement cooperative control heat pipe system, the system comprises an air heater and a heat storage device, the air heater is arranged on the main pipeline of the flue gas, the heat storage device is arranged on the auxiliary pipeline, and the main pipeline and the auxiliary pipeline form a parallel pipeline; the system comprises a first valve and a second valve, 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, the fourth valve is arranged on the flue gas pipeline downstream of the air heater and the heat storage device, the second valve is arranged at the inlet of the air heater of the main pipeline, and the first valve Set at the position of the inlet pipe of the heat storage of the auxiliary pipeline, the system is also provided with a bypass pipeline connected to the main pipeline of flue gas, the connection position of the bypass pipeline and the main pipeline of flue gas is located upstream of the third valve, and the ninth valve is arranged on the bypass pipeline; The first valve, the second valve, and the ninth valve are opened, and the third valve and the fourth valve are closed. When the central controller detects that smoke passes through the flue gas pipeline, the central controller controls the ninth valve to close, and controls the third valve and the fourth valve to be in an open state; it is characterized in that a fourth temperature sensor is set in the flue gas pipeline upstream of the third valve, and the fourth temperature sensor is used to detect the flue gas temperature in the flue gas pipeline; the fourth temperature sensor is connected to the central controller for data, and the central controller controls the opening and closing of the third valve and the fourth valve according to the data detected by the fourth temperature sensor; The main pipeline of flue gas 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, a sixth valve is arranged on the main pipeline of flue gas corresponding to the first bypass pipeline; an eighth valve and a second air heater are respectively arranged on the second bypass pipeline, a second heat pipe is arranged in the second air heater, and a seventh valve is arranged on the main pipeline of flue gas corresponding to the second bypass pipeline; A temperature sensing element is set inside the first heat pipe and the second heat pipe, the controller extracts the temperature data according to the time sequence, and obtains the temperature difference or the accumulation of the temperature difference change by comparing 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, 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, thereby achieving the purpose of enhancing heat transfer and descaling; 2) The temperature difference detected by the temperature sensing element in the first heat pipe or the cumulative 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 flue gas enters the second heat pipe for heat exchange and does not enter the first heat pipe, so that the tube bundle in the second heat pipe vibrates, thereby achieving the purpose of enhancing heat transfer and descaling; 3) When the temperature difference detected by the temperature sensing element in the second heat pipe or the cumulative temperature difference change is lower than a certain value, the controller controls the fifth valve and the seventh valve to open, the sixth valve and the eighth valve to close, 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, thereby achieving the purpose of enhancing heat transfer and descaling; Then steps 2) and 3) are repeated continuously, so as to realize the alternate heating of the first heat pipe and the second heat pipe. 2. The heat pipe system as claimed in claim 1, when the central controller detects that the temperature of the flue gas in the flue gas pipeline exceeds a certain temperature, the central controller controls the third valve and the fourth valve to be in an open state, and the flue gas can enter the air heater and the heat storage device, and exhaust the smoke after the heat exchange is completed. 3. The heat pipe system according to claim 1, when the central controller detects that the temperature of the flue gas in the flue gas pipeline is lower than a certain temperature, the central controller controls the third valve and the fourth valve to close, and the pipeline where the air heater and heat storage are located forms a circulation pipeline. 4. The heat pipe system according to claim 1, when the fourth temperature sensor detects that the temperature exceeds a certain temperature, the central controller controls the ninth valve to close, and the third valve and the fourth valve to open. 5. The heat pipe system according to claim 1, when the fourth temperature sensor detects that the temperature is lower than a certain temperature, the central controller controls the ninth valve to open, and the third valve and the fourth valve to close.