CN104748996B - Power plant's smoke discharging residual heat utilizes system Dynamic Response Simulation experimental apparatus for testing and method - Google Patents

Abstract

The invention discloses a dynamic response simulation test device and method for a power plant exhaust waste heat utilization system, including a centrifugal fan, a test section, a simulation component and a measuring device, and the test section includes a flue gas heat exchanger simulation test section and an air preheating test section; the centrifugal fan is set at the air inlet, and the air outlet of the centrifugal fan is divided into two roads through the pipeline. One road is equipped with a flue gas heat exchanger simulation test section, and the other road is equipped with an air preheating test section. It is connected with the simulation test section of the flue gas heat exchanger through pipelines; there are simulation components outside the pipeline, and the simulation components include an expansion tank and a constant temperature water bath. The inlet and outlet pipes of the heat pipe bundle and the heat exchange pipe bundle of the air preheating test section are connected to form a closed loop of circulating water, and a constant temperature water tank circulation pump is installed on the constant temperature water bath; Response test, the test method is simple.

Description

Experimental device and method for dynamic response simulation test of power plant exhaust waste heat utilization system

technical field

The invention relates to a dynamic response simulation test experiment device and method of a power plant exhaust waste heat utilization system.

Background technique

my country's energy structure determines that the pattern of coal-fired power generation as the main body will not change significantly for a long time. In recent years, my country's installed power capacity has grown rapidly. As of the end of 2013, the total installed capacity of the country's electric power has reached 1.247 billion kilowatts, second only to the United States, of which thermal power is 862 million kilowatts, accounting for 69% of the country's total installed capacity. In 2015, my country's thermal power installed capacity will reach 933 million kilowatts, thermal power generation will account for more than 80% of the total power generation, and the annual coal consumption will reach more than 2 billion tons. "Energy saving and emission reduction" of large thermal power units has always been an important energy policy of the country, and each power plant is faced with a huge potential for energy saving.

Among the various losses of the boiler, the exhaust gas loss is the largest item, and reducing the exhaust gas temperature has important practical significance for energy saving and emission reduction. At present, the exhaust gas temperature of boilers is usually 120-140°C. For every 10-20°C reduction in exhaust gas temperature, the thermal efficiency of the boiler will increase by about 0.6%-1%, and the corresponding coal consumption will be reduced by 1.2%-2.4%. The waste heat from boiler tail exhaust is a low-grade heat source, which has the characteristics of large flue gas volume, low energy density, and difficult recovery; however, its utilization potential is huge. If it can be fully utilized, it will not only save a lot of energy, but also bring considerable social and economic benefits. Solving the energy shortage problem can also greatly reduce environmental pollution. At present, there are many studies on the utilization of exhaust waste heat. It can be used as heat recovery heat to be introduced into the steam recovery system to heat the condensate water of the steam turbine, or imported cold air through the heating air preheater to be introduced into the boiler, all of which have certain energy-saving effects.

At present, although the theoretical research on "Using exhaust waste heat to heat the inlet cold air of the air preheater to introduce the boiler energy-saving system" has been sufficient, the actual engineering experience is still insufficient, especially the site environment of the power plant is complex, and many locations are not suitable for installation and testing. point, the measurement installation is limited; some measuring devices are aging and damaged, resulting in inaccurate measurement results; the system equipment capacity is only determined according to the design working conditions, and the variable working conditions and limit working conditions are not analyzed. For the variable parameters in actual operation, the dynamics of the system There is no guiding procedure for the response; simulation calculations using process simulation software have limitations in the results obtained.

Contents of the invention

In order to solve the above problems, the present invention proposes a dynamic response simulation test device and method for a power plant exhaust waste heat utilization system. This device simplifies the system and ensures measurement accuracy on the basis of satisfying the principle of similarity in the flow field of each equipment in the power plant; The actual working conditions of the power plant system simulate the flow and heat transfer characteristics of the equipment, conduct simulation tests on the system, and observe the dynamic response characteristics of the system under different influencing factors.

In order to achieve the above object, the present invention adopts the following technical solutions:

A dynamic response simulation test device for a power plant exhaust waste heat utilization system, including a centrifugal fan, a test section, a simulation component and a measuring device, wherein:

The test section includes an electric heating test section, a flue gas heat exchanger simulation test section, an air temperature adjustment test section and an air preheating test section;

The centrifugal fan is set at the air inlet, and the air outlet of the centrifugal fan is divided into two paths through the pipeline, and the wind speed is controlled by the shutter respectively to meet the flow ratio of the flue gas side and the air side; the air along the way first passes through the electric heating test section, and is used After the dry-burning air electric heating tube heats the air, it enters the simulation test section of the flue gas heat exchanger for heat exchange;

The air on the other road first passes through the air temperature adjustment test section, after heating or cooling the air, enters the air preheating test section for heat exchange, the air discharged from the air preheating test section and the air discharged from the flue gas heat exchanger simulation test section The temperature and wind speed measurement points are respectively set at the entrance and exit of the rectangular air duct of the flue gas heat exchanger simulation test section, electric heating test section, air preheating test section and air temperature adjustment test section;

There are simulation components outside the pipeline, and the simulation components include a constant temperature water bath and an expansion tank. The water inlet and outlet pipes of the constant temperature water bath are respectively connected with the inlet and outlet pipes of the heat exchange tube bundle in the air temperature adjustment test section to form a closed loop of circulating water. The air temperature at the inlet of the preheater is adjusted; the air preheating test section and the simulation test section of the flue gas heat exchanger are connected with water pipes through the way of bottom inlet and top outlet to form a closed loop, and an expansion tank is installed at the inlet of the circulating water pump to carry out Moisturizing and constant pressure;

The air discharged from the air preheating test section is discharged outside together with the air discharged from the flue gas heat exchanger simulation test section. The measuring device measures the parameters of the test section and transmits them to the data collector.

The simulated test section of the flue gas heat exchanger adopts H-shaped finned tubes or spiral finned tube bundles arranged in parallel or staggered arrangement, and the air preheating test section adopts spiral finned tube bundles arranged in parallel or staggered arrangement. The circulating water flows, and the two test sections are connected with water pipes in the way of bottom in and top out. The temperature of the circulating water in the simulation test section of the flue gas heat exchanger rises, and the temperature of the heat release in the air preheating test section drops, forming a closed cycle. For the circuit, the flow rate is changed by the circulating pump to carry out the variable flow condition test, and an open high-level expansion tank is set up for constant pressure, respectively at the inlet and outlet pipe sections of the upper and lower water headers in the simulation test section of the flue gas heat exchanger and the air preheating test section Set the temperature measuring points to obtain the inlet and outlet temperatures of each point on the water side.

The air temperature adjustment test section is arranged with rectangular elliptical finned tube bundles, and the water in the constant temperature water bath flows in the tube. The temperature measuring point is set at the inlet and outlet pipe section of the header to obtain the inlet and outlet temperature of the water side.

The electric heating test section uses a dry-fired air electric heating tube to heat the air, and uses high-temperature air to simulate flue gas. In order to ensure the constant temperature of the heating air, a temperature control device is added; an intelligent PID temperature controller and a SSR solid-state relay are used for control. In the temperature system, the temperature controller monitors the flue temperature in real time through the thermocouple measuring point installed in the flue, and controls the solid state relay on and off based on this, and finally reaches the temperature required for the experiment.

A kind of simulation test experiment method based on above-mentioned device, specifically comprises the following steps:

(1) Carry out the experiment of air variable temperature condition at the inlet of the air preheating test section;

(2) Change the inlet smoke temperature, and conduct the variable working condition experiment of the flue gas heat exchanger simulation test section;

(3) Control the circulating water flow, and conduct the experiment of changing working conditions of the circulating water.

In described step (1), specific method comprises the following steps:

①The constant temperature water bath is filled with water and heated to the set temperature;

② Turn on the water pump and run it at low speed until the air in the test tube bundle is emptied, then run the water pump at high speed until the working condition is stable, that is, the temperature measurement of the inlet and outlet pipe sections on the water side is the same;

③ Turn on the fan, adjust the gate valves of the two air ducts respectively, and measure the wind speed of the two air ducts with a micromanometer until the flow ratio between the air preheating test section and the flue gas heat exchanger simulation test section reaches the set value;

④ Connect the electric heating pipe, set the temperature of the simulated flue gas to heat the simulated test section of the flue gas heat exchanger;

⑤ After the working condition is stable, read the inlet and outlet temperatures of the water side and air side of the data acquisition instrument, read the readings of the circulating pump water meter and the rotor flowmeter, and use the "nine square grid" method to measure with pitot tube and micro pressure gauge Obtain the average wind speed of the obtained cross-section;

⑥Adjust the water temperature of the constant temperature water bath, repeat the above steps to obtain the inlet and outlet temperatures of the water side and air side, the flow velocity of the water side and the average wind velocity of the cross section under different air preheating test section inlet air temperatures.

In the step ⑤, stable working condition refers to running for more than 30 minutes.

In described step (2), the experimental method of changing inlet smoke temperature comprises:

a. Turn on the fan, adjust the gate valves of the two air ducts respectively, and measure the wind speed of the two air ducts with a micromanometer until the flow ratio of the air preheating test section and the flue gas heat exchanger simulation test section is the set value;

b. Connect the electric heating tube, change the temperature of the simulated flue gas, and heat the simulated test section of the flue gas heat exchanger;

c. After the working conditions are stable, read the inlet and outlet temperatures of the water side and air side of the data acquisition instrument, read the readings of the water meter of the circulating pump and the rotor flowmeter, and use the "nine-square grid" method to use the pitot tube and micro pressure gauge Measure the average wind speed of the obtained cross-section;

d. With an interval of 5°C, set different simulated flue gas temperatures, heat the simulated test section of the flue gas heat exchanger, and repeat the above steps to obtain the "flue gas" temperature at the inlet of the simulated test section of the flue gas heat exchanger. , the inlet and outlet temperatures of the water and air sides, the flow velocity of the water side, and the average wind velocity of the cross section.

The specific steps of described step (3) circulating water variable working condition experiment include:

(3-1) Turn on the fan, adjust the gate valves of the two air ducts respectively, and measure the wind speed of the two air ducts with a micromanometer until the flow ratio between the air preheating test section and the flue gas heat exchanger simulation test section is the set value;

(3-2) Connect the electric heating pipe, set the temperature of the simulated flue gas to heat the simulated test section of the flue gas heat exchanger;

(3-3) Adjust the valve connected behind the circulating water pump to control the circulating water flow to reach 50% of the set flow;

(3-4) After the working condition is stable, read the inlet and outlet temperatures of the water side and air side of the data acquisition instrument, read the readings of the water meter of the circulating pump and the rotor flowmeter, and use the "nine-square grid" method to use the pitot tube and The average wind speed of the obtained cross-section is obtained by micromanometer measurement;

(3-5) Adjust the valve connected to the circulating water pump to control the circulating water flow from 50% to 100%. Repeat the above steps to obtain the inlet and outlet temperatures of the water side and the air side under different circulating water flows, and the water side Velocity and average wind velocity across the cross-section.

The stable working condition in the step (3-4) refers to running for more than 30 minutes.

The beneficial effects of the present invention are:

(1) Simulate the flow and heat transfer characteristics of each equipment according to the actual working conditions of the power plant system, and simulate the system;

(2) Simplify the dynamic response test of the system on the basis of satisfying the similar principles;

(3) In this test bench, the air preheating test section inlet air variable temperature working condition experiment, the flue gas heat exchanger simulation test section variable inlet flue temperature working condition experiment, and the circulating water variable working condition experiment can be carried out;

(4) Provide a reliable test data basis for the design and operation of the actual project of the power plant, as well as a forecast change curve for variable working conditions.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Among them, A-air inlet; B-fan; C-electric heating test section; D-flue gas heat exchanger simulation test section; E-air temperature adjustment test section; F-air preheating test section; G-circulating water pump; H-high-level open expansion tank; J-electrically heated constant temperature water bath that can set temperature and record heating time; K-circulating pump of constant temperature water tank; L-adjustable baffle valve; 1-12-thermocouple temperature measuring point.

Detailed ways:

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the devices in this test platform include centrifugal fan B, air duct adjustment gate, electric heating test section C, flue gas heat exchanger simulation test section D, air temperature adjustment test section E, air preheating test section F. Circulating water pump G, high-level open expansion tank H, electric heating constant temperature water bath J that can set temperature and record heating time, supporting circulation pump K of constant temperature water bath; measuring devices include pitot tube, electronic micromanometer, air duct temperature measuring point Sensor, circulating water measurement temperature sensor, rotameter.

Dynamic response test under different influencing factors:

This platform can measure the dynamic response test of the system under different influencing factors of the flue gas heat exchanger simulation test section D heat exchange tube bundle and the air preheating test section F heat exchange tube bundle. , use gates to control the wind speed to meet the flow ratio between the flue gas side and the air side; one of the air first passes through the electric heating test section C, and after the air is heated by the dry-burning air electric heating tube, it enters the flue gas heat exchanger for simulation The test section D is for heat exchange; the other air first passes through the air temperature adjustment test section E to heat or cool the air, and then enters the air preheating test section F for heat exchange. The air discharged from the air preheating test section F is mixed with smoke The air discharged from the simulation test section D of the air heat exchanger is discharged outside together, and is respectively in the rectangular air ducts of the simulation test section D of the flue gas heat exchanger, the electric heating test section C, the air preheating test section F and the air temperature adjustment test section E The temperature and wind speed measuring points are set at the entrance and exit, and the average wind speed and temperature of each cross section of the air duct are obtained by using the "nine square grid" method.

Among them, the flue gas heat exchanger simulation test section D adopts H-shaped finned tubes or spiral finned tube bundles arranged in parallel or staggered arrangement, and the air preheating test section F adopts spiral finned tube bundles arranged in parallel or staggered arrangement , the circulating water flows in the pipe, and the two test sections are connected with the water pipes in the way of bottom in and top out. A closed circulation loop is formed, and the flow rate is changed by the circulating pump to carry out the variable flow rate test, and an open high-level expansion tank is set up for constant pressure. The temperature measuring points are set at the inlet and outlet pipe sections of the header to obtain the inlet and outlet temperatures of each point on the water side.

The electric heating test section C uses dry-burning air electric heating tubes to heat the air, and uses high-temperature air to simulate flue gas. In order to ensure the constant temperature of the heating air, a temperature control device is added; intelligent PID temperature controllers and SSR solid-state relays are used for temperature control. System, the temperature controller monitors the flue temperature in real time through the thermocouple measuring points installed in the flue, and controls the solid state relay on and off based on this, and finally reaches the temperature required for the experiment.

The air temperature adjustment test section E adopts the original rectangular elliptical finned tube bundle arrangement, and the water in the constant temperature water bath flows in the tube. By adjusting the water temperature of the constant temperature water bath, the air inlet temperature before the air preheating test section F is adjusted. Set temperature measuring points at the inlet and outlet pipe sections of the upper and lower water headers to obtain the inlet and outlet temperatures on the water side.

In the actual measurement, the measurement is carried out according to the following steps:

1) The condition of variable air temperature at the inlet of air preheating test section F

①The constant temperature water bath is filled with water and heated to the set temperature;

② Turn on the water pump and run it at low speed until the air in the test tube bundle is emptied, then run the water pump at high speed until the working condition is stable (the temperature measurement of the inlet and outlet pipe sections on the water side is the same);

③ Turn on the fan, adjust the gate valves of the two air ducts respectively, and measure the wind speed of the two air ducts with a micromanometer until the flow ratio of the air preheating test section F and the flue gas heat exchanger simulation test section D is 1.52:1;

④ Connect the electric heating tube, set the temperature of the simulated flue gas to heat the simulated test section D of the flue gas heat exchanger;

⑤ After the working condition is stable (30min), read the inlet and outlet temperatures of the water side and air side of the data acquisition instrument, read the readings of the water meter of the circulating pump and the rotor flowmeter, and use the "nine-square grid" method to use the pitot tube and the micrometer. The average wind speed of the obtained cross-section is obtained by barometer measurement;

⑥Adjust the water temperature of the constant temperature water bath, repeat the above steps to obtain the inlet and outlet temperatures of the water side and the air side, the flow velocity of the water side and the average wind velocity of the cross section under different air temperature at the inlet of the air preheating test section F.

2) Flue gas heat exchanger simulation test section D variable working condition

① Turn on the fan, adjust the gate valves of the two air ducts respectively, and measure the wind speed of the two air ducts with a micromanometer until the flow ratio of the air preheating test section F and the flue gas heat exchanger simulation test section D is 1.52:1;

② Connect the electric heating tube, change the temperature of the simulated flue gas, and heat the simulated test section D of the flue gas heat exchanger;

③ After the working condition is stable (30min), read the inlet and outlet temperatures of the water side and the air side of the data acquisition instrument, read the readings of the water meter of the circulating pump and the rotor flowmeter, and use the "nine-square grid" method to use the pitot tube and the micrometer. The average wind speed of the obtained cross-section is obtained by barometer measurement;

④ With an interval of 5°C, set different simulated flue gas temperatures, heat the simulated test section of the flue gas heat exchanger, repeat the above steps to obtain the "flue gas" temperature at the inlet D of the simulated test section of the flue gas heat exchanger , the inlet and outlet temperatures of the water and air sides, the flow velocity of the water side, and the average wind velocity of the cross section.

3) Changing working condition of circulating water

① Turn on the fan, adjust the gate valves of the two air ducts respectively, and measure the wind speed of the two air ducts with a micromanometer until the flow ratio of the air preheating test section F and the flue gas heat exchanger simulation test section D is 1.52:1;

② Connect the electric heating tube, set the temperature of the simulated flue gas to heat the simulated test section D of the flue gas heat exchanger;

③Adjust the valve connected to the circulating water pump G to control the circulating water flow to 50% of the set flow;

④ After the working condition is stable (30min), read the inlet and outlet temperatures of the water side and air side of the data acquisition instrument, read the readings of the water meter of the circulating pump and the rotor flowmeter, and use the "nine-square grid" method to use the pitot tube and the micrometer. The average wind speed of the obtained cross-section is obtained by barometer measurement;

⑤ Adjust the valve connected to the circulating water pump G to control the circulating water flow from 50% to 100%. Repeat the above steps to obtain the inlet and outlet temperatures of the water side and the air side, the flow rate of the water side and the transverse The average wind speed of the section.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (8)

1. A dynamic response simulation test device for a power plant exhaust waste heat utilization system, characterized in that it includes a centrifugal fan, a test section, a simulation component and a measuring device, wherein: The test section includes an electric heating test section, a flue gas heat exchanger simulation test section, an air temperature adjustment test section and an air preheating test section; The centrifugal fan is installed at the air inlet, and the air outlet of the centrifugal fan is divided into two paths through the pipeline, and the wind speed is controlled by the gate valve respectively to meet the flow ratio between the flue gas side and the air side; the air along the way first passes through the electric heating test section, After the air is heated by a dry-burning air electric heating tube, it enters the simulation test section of the flue gas heat exchanger for heat exchange; The air on the other road first passes through the air temperature adjustment test section, after the air is heated or cooled, it enters the air preheating test section for heat exchange, respectively in the flue gas heat exchanger simulation test section, the electric heating test section, and the air preheating test section. Set the temperature and wind speed measuring points at the inlet and outlet of the rectangular air duct in the section and the air temperature adjustment test section; There are simulation components outside the pipeline. The simulation components include a constant temperature water bath and an open high-level expansion water tank. The water inlet and outlet pipes of the constant temperature water bath are respectively connected with the inlet and outlet pipes of the heat exchange tube bundle in the air temperature adjustment test section to form a closed loop of circulating water. , to adjust the air temperature at the inlet of the air preheating test section; the air preheating test section and the simulation test section of the flue gas heat exchanger are connected to the water pipes through the way of bottom in and top out to form a closed loop, and set at the inlet of the circulating water pump Open-type high-level expansion tank for water replenishment and constant pressure; The air discharged from the air preheating test section is discharged outside together with the air discharged from the flue gas heat exchanger simulation test section, and the measuring device measures the parameters of the test section and transmits them to the data collector; The simulated test section of the flue gas heat exchanger adopts H-shaped finned tubes or spiral finned tube bundles arranged in parallel or staggered arrangement, and the air preheating test section adopts spiral finned tube bundles arranged in parallel or staggered arrangement. The circulating water flows, and the two test sections are connected with water pipes in the way of bottom in and top out. The temperature of the circulating water in the simulation test section of the flue gas heat exchanger rises, and the temperature of the heat release in the air preheating test section drops, forming a closed cycle. In the circuit, the flow rate is changed by the circulating water pump to carry out the variable flow condition test, and an open high-level expansion tank is set up for constant pressure, respectively at the inlet and outlet pipe sections of the upper and lower water headers in the simulation test section of the flue gas heat exchanger and the air preheating test section Set the temperature measuring points to obtain the inlet and outlet temperatures of each point on the water side. 2. A dynamic response simulation test device for a power plant exhaust waste heat utilization system as claimed in claim 1, characterized in that: the air temperature adjustment test section is arranged in a rectangular elliptical finned tube bundle, and the water in the constant temperature water bath is in the tube Flow, adjust the air inlet temperature before the air preheating test section by adjusting the water temperature of the constant temperature water bath. 3. The dynamic response simulation test device of a power plant exhaust waste heat utilization system as claimed in claim 1, characterized in that: the electric heating test section uses dry-fired air electric heating tubes to heat the air, and uses high-temperature air to simulate For the flue gas, in order to ensure the constant temperature of the heating air, a temperature control device is added; the temperature control system adopts the intelligent PID temperature controller and the SSR solid state relay, and the temperature controller measures the points in real time through the thermocouple installed in the pipeline behind the electric heating test section. Monitor the temperature of the pipeline after the electric heating test section, and use this as a basis to control the pull-in and disconnection of the solid-state relay, and finally reach the temperature required for the experiment. 4. A simulation test experiment method based on the device according to any one of claims 1-3, characterized in that: specifically comprise the following steps: (1) Carry out the experiment of air variable temperature condition at the inlet of the air preheating test section; (2) Change the inlet smoke temperature, and conduct the variable working condition experiment of the flue gas heat exchanger simulation test section; (3) Control the circulating water flow, and conduct the experiment of changing working conditions of the circulating water. 5. simulation test experiment method as claimed in claim 4, is characterized in that: in described step (1), concrete method comprises the following steps: ①The constant temperature water bath is filled with water and heated to the set temperature; ② Turn on the water pump and run it at a low speed until the air in the water pipe connecting the air preheating test section and the flue gas heat exchanger simulation test section is emptied, then run the water pump at a high speed until the working conditions are stable The temperature measurement of the water side inlet and outlet pipe sections of the heater simulation test section is the same; ③ Turn on the fan, adjust the gate valves of the two air ducts respectively, and measure the wind speed of the two air ducts with a micromanometer until the flow ratio between the air preheating test section and the flue gas heat exchanger simulation test section reaches the set value; ④ Connect the electric heating pipe, set the temperature of the simulated flue gas to heat the simulated test section of the flue gas heat exchanger; ⑤ After the working condition is stable, read the simulation test section of the flue gas heat exchanger of the data collector and the water side of the air preheating test section, the simulation test section of the flue gas heat exchanger, the electric heating test section, and the air preheating test section And the inlet and outlet temperature of the air side of the air temperature adjustment test section, read the readings of the water meter of the circulating water pump and the rotameter, and use the "nine squares" method to measure the average wind speed of the cross section with the Pitot tube and the micromanometer; ⑥Adjust the water temperature of the constant temperature water bath, and repeat the above steps to obtain the simulated test section of the flue gas heat exchanger and the water side of the simulated test section of the air preheater, the simulated test section of the flue gas heat exchanger, and the electric The inlet and outlet temperatures of the air side of the heating test section, the air preheating test section and the air temperature adjustment test section, the flow velocity of the water side and the average wind speed of the cross section. 6. simulation test experiment method as claimed in claim 4, is characterized in that: the concrete steps of described step (2) comprise: a. Turn on the fan, adjust the gate valves of the two air ducts respectively, and measure the wind speed of the two air ducts with a micromanometer until the flow ratio of the air preheating test section and the flue gas heat exchanger simulation test section is the set value; b. Connect the electric heating pipe, set the temperature of the simulated flue gas, and heat the simulated test section of the flue gas heat exchanger; c. After the working condition is stable, read the simulation test section of the flue gas heat exchanger of the data collector and the water side of the air preheating test section, the simulation test section of the flue gas heat exchanger, the electric heating test section, and the air preheating test The inlet and outlet temperatures of the air side of the section and the air temperature adjustment test section, read the readings of the water meter of the circulating water pump and the rotameter, and use the "nine squares" method to measure the average wind speed of the cross section with the Pitot tube and the micromanometer; d. With an interval of 5°C, set different simulated flue gas temperatures, heat the simulated test section of the flue gas heat exchanger, and repeat the above steps to obtain the "flue gas" temperature at the inlet of the simulated test section of the flue gas heat exchanger. , the water side of the flue gas heat exchanger simulation test section and the air preheating test section and the inlet and outlet of the air side of the flue gas heat exchanger simulation test section, electric heating test section, air preheating test section and air temperature adjustment test section temperature, waterside flow velocity, and mean wind velocity across the cross section. 7. simulation test experiment method as claimed in claim 4, is characterized in that: the concrete steps of described step (3) comprise: (3-1) Turn on the fan, adjust the gate valves of the two air ducts respectively, and measure the wind speed of the two air ducts with a micromanometer until the flow ratio between the air preheating test section and the flue gas heat exchanger simulation test section is set value; (3-2) Connect the electric heating pipe, set the temperature of the simulated flue gas to heat the simulated test section of the flue gas heat exchanger; (3-3) Adjust the valve connected behind the circulating water pump to control the circulating water flow to reach 50% of the set flow; (3-4) After the working condition is stable, read the simulation test section of the flue gas heat exchanger of the data collector and the water side of the air preheating test section, the simulation test section of the flue gas heat exchanger, the electric heating test section, the air The inlet and outlet temperatures of the air side of the preheating test section and the air temperature adjustment test section are read from the readings of the water meter of the circulating water pump and the rotameter, and the "nine squares" method is used to measure the cross-section with a Pitot tube and a micromanometer. average wind speed; (3-5) Adjust the valve connected to the circulating water pump to control the circulating water flow from 50% to 100%. Repeat the above steps to obtain the simulation test section of the flue gas heat exchanger and air preheating under different circulating water flows The water side of the test section and the flue gas heat exchanger simulation test section, the electric heating test section, the air preheating test section and the air temperature adjustment test section The inlet and outlet temperatures of the air side, the flow velocity of the water side and the average wind speed of the cross section. 8. The experimental method of simulation testing according to claim 7, characterized in that: the stable working conditions in the step (3-4) refer to running for more than 30 minutes.