Cooling, noise reduction and water mist reduction comprehensive test device for high-temperature and high-speed flue gas

Abstract

The invention belongs to the technical field of high-temperature and high-speed flue gas treatment, and relates to a cooling, noise reduction and water mist reduction comprehensive test device for high-temperature and high-speed flue gas. The device comprises a high-temperature and high-speed flue gas simulation device, a front measurement device, a noise generation section, a water spraying, cooling and noise reduction section, a silencer, a water collection tank and a rear measurement device, wherein high-temperature and high-speed flue gas test incoming flow conditions with different noise spectrum characteristics are generated through the high-temperature and high-speed flue gas simulation device and the noise generation section; a water spraying cooling and noise reduction section, a silencer and a water collection tank are used as test sections to carry out cooling, noise reduction and water mist reduction multi-working-condition tests; the front measuring device and the rear measuring device are used for measuring incoming flow conditions and treated flow field characteristics so as to quantitatively evaluate the cooling, noise reduction and water mist reduction effects of the test section. The method is low in cost and obvious in effect; through a mechanical connection mode, installation is convenient, and application and popularization are easy; modularized design is adopted, and cooling, noise reduction and gas-liquid separation can be achieved at the same time through multiple modular designs.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature and high-speed flue gas treatment, and in particular to a comprehensive test device for cooling, noise reduction and water mist precipitation of high-temperature and high-speed flue gas. Background Art

[0002] In the fields of petroleum, chemical industry and rocket propulsion, ejectors are usually used to generate high-speed jets to remove exhaust gas to ensure the normal operation of the equipment. Ejectors use high-pressure steam or alcohol oxygen combustion as power. High-pressure steam is ejected through a nozzle to form a high-temperature and high-speed jet. The high-temperature and high-speed jet mixes with the ejected medium, and the surrounding medium is ejected and finally discharged into the atmosphere.

[0003] During the use of the ejector, high-temperature and high-speed jets are discharged into the air, a shear layer is generated between the airflow and the surrounding medium, and compression waves are generated after the air is compressed, which brings strong aerodynamic noise and affects the health of personnel. At the same time, high noise is usually accompanied by high-frequency vibration. Long-term vibration will damage the equipment and increase the equipment failure rate and maintenance cost. After being discharged into the atmosphere, the high-temperature and high-speed jets will condense into a large range of water mist, which is not conducive to stealth.

[0004] At present, there is no device in China that can achieve noise reduction, temperature reduction and gas-liquid separation when processing high-temperature and high-speed flue gas. Therefore, it is urgent to design a comprehensive test device for temperature reduction, noise reduction and water mist precipitation of high-temperature and high-speed flue gas. Through this device, it is possible to study and achieve the purpose of reducing the noise of high-temperature and high-speed flue gas, and achieving temperature reduction and gas-liquid separation. Summary of the invention

[0005] (I) Purpose of the present invention

[0006] The present invention aims to provide a comprehensive test device for cooling, denoising and mist precipitation of high-temperature and high-speed flue gas, which can simultaneously achieve noise reduction, cooling and gas-liquid separation when processing the high-temperature and high-speed flue gas generated by an ejector.

[0007] (II) Technical solution of the present invention

[0008] The present invention is implemented according to the following technical solutions:

[0009] One aspect of the present invention provides a comprehensive test device for cooling, noise reduction and water mist precipitation for high-temperature and high-speed flue gas, comprising a high-temperature and high-speed flue gas simulation device 1, a front measuring device 2, a noise generating section 3, a water spray cooling and noise reduction section 4, a silencer 5, a water collecting tank 6 and a rear measuring device 7; the high-temperature and high-speed flue gas simulation device 1, the front measuring device 2, the noise generating section 3, the water spray cooling and noise reduction section 4, the silencer 5, the water collecting tank 6 and the rear measuring device 7 are connected in sequence from front to back through connecting flanges.

[0010] Furthermore, the high-temperature and high-speed flue gas simulation device includes an air compressor, a pipeline heater and a pipeline transportation device. The air compressor provides high-speed airflow, the pipeline heater heats the airflow to a specified temperature, and the pipeline transportation device transports the high-temperature and high-speed flue gas.

[0011] Furthermore, the front measuring device is used to measure the pressure, flow rate and temperature of the high-temperature and high-speed flue gas before it enters the noise generating section, and includes a pressure transmitter, a pitot tube, a temperature transmitter and a gas-liquid inlet pipe. The gas-liquid inlet pipe 2d is used to transport the high-temperature and high-speed flue gas; a pressure transmitter 2a is provided at the front end of the gas-liquid inlet pipe 2d, a pitot tube 2b is provided in the middle, and a temperature transmitter 2c is provided at the tail.

[0012] Furthermore, the noise generating section includes a sound absorbing device, a loudspeaker, a loudspeaker cooling tube, a microphone and a microphone mounting bracket; the noise generating section 3 is located at the rear end of the front measuring device 2, the sound absorbing device 3a serves as the main body of the noise generating section 3, the sound absorbing device 3a is a rectangular pipe with connecting flanges at the front and rear ends, and is used to transport high-temperature and high-speed flue gas; a loudspeaker cooling tube 3c is arranged on each plane at the front end of the sound absorbing device 3a, and a loudspeaker 3b for simulating noise is mechanically fixed to the top of the loudspeaker cooling tube 3c through four circular holes; a microphone mounting bracket 3e is arranged at the tail of the sound absorbing device 3, and the microphone mounting bracket 3e is used to fix a microphone 3d for detecting noise decibels; the noise generating section uses four loudspeakers to emit the noise of the sound pressure level required for the test, the loudspeaker cooling tube is cooled by water circulation to ensure that the loudspeaker is not damaged by high temperature, and the microphone is used to measure the decibel size of the simulated noise.

[0013] Furthermore, the water spray cooling and noise reduction section includes a gas container and an atomizing nozzle; the flow channel cross-sectional area of ​​the gas container 4a increases continuously from the inlet to the outlet, and at the same time, atomizing nozzles 4b are arranged in three rows along the flow channel direction of the gas container 4a; the gas container is used to transport high-temperature, high-pressure and high-noise flue gas; the atomizing nozzle 4b sprays water into fine droplets or mist.

[0014] Furthermore, the silencer includes a silencer chamber and silencer cotton; the silencer chamber is used to transport high-temperature and high-speed smoke, and silencer cotton is evenly arranged around the silencer chamber, and the silencer cotton is used to absorb the noise caused by the flow of high-temperature and high-speed smoke.

[0015] Furthermore, the water collecting tank comprises a box body, a corrugated plate, a water leakage hole plate and a water storage tank; the corrugated plate is designed to be wavy in plane; a plurality of corrugated plates 6a are arranged in the box body, and the box body and the water storage tank 6c are separated by a water leakage hole plate 6b.

[0016] Furthermore, the post-measurement device includes an exhaust gas outlet, a temperature transmitter, a pressure transmitter, a pitot tube, and a microphone. The exhaust gas outlet is used to discharge high-temperature and high-speed flue gas that has been treated with temperature reduction, noise reduction, and speed reduction, and is a rectangular pipe with a connecting flange at the front end; the temperature transmitter, pressure transmitter, pitot tube, and microphone are used to measure the temperature, pressure, flow rate, and noise of the high-temperature and high-speed flue gas, respectively. The temperature transmitter and pressure transmitter are installed at the front end of the exhaust gas outlet, and the pitot tube and microphone are installed at the rear end.

[0017] The present invention also provides a comprehensive test method for a comprehensive test device to conduct a temperature reduction, noise reduction, and water mist precipitation test on high-temperature and high-speed flue gas, comprising the following steps:

[0018] Step 1: Design, process and assemble the test bench, debug the air compressor, debug the pipe heater, debug the data logger, debug the noise generator and debug the water spray system;

[0019] Step 2: The air compressor outputs high-speed airflow, the pipeline heater heats the high-speed airflow, and the high-temperature and high-speed flue gas is transported through the pipeline transportation device;

[0020] Step 3: Use the temperature transmitter on the front measuring device to continuously detect whether the temperature reaches the test condition. If not, increase the power of the pipe heater and return to Step 2. If it reaches, use the pitot tube on the front measuring device to continuously detect whether the gas-liquid velocity reaches the test condition. If not, increase the power of the air compressor and return to Step 2. If it reaches, proceed to the next step.

[0021] Step 4: Continuously output through four speakers to simulate a high noise environment in the sound absorbing device, and continuously detect whether the noise decibel reaches the test condition through the microphone. If not, increase the power of the speaker. If it reaches, proceed to the next step. During use, the speaker continues to maintain a high temperature, and the speaker cooling pipe cools the speaker through water circulation;

[0022] Step 5: When the temperature, speed and noise environment of the flue gas meet the test conditions, the water spray cooling and noise reduction section starts to work, and the three-stage atomizing nozzle sprays water to continuously cool, reduce speed and reduce noise of the flue gas;

[0023] Step 6: The flue gas after cooling and speed reduction is further treated by the silencer for noise reduction;

[0024] Step 7: The smoke after noise reduction treatment enters the water collecting tank, and the water collecting tank intercepts the gas and liquid through the corrugated plate. After the liquid is deposited, it flows into the water collecting tank through the leaking orifice plate;

[0025] Step 8: Before the exhaust gas is discharged, the temperature, pressure, flow rate and noise generated by the exhaust gas are measured by the temperature transmitter, pressure transmitter, Pitot tube and microphone to see if they are qualified. If not, re-execute Step 5 by increasing the power.

[0026] The beneficial effects of the present invention are as follows:

[0027] (1) Cooling and noise reduction by spraying water, which is low-cost but effective;

[0028] (2) The device is easy to install and popularize through mechanical connection methods such as bolts and nuts;

[0029] (3) The device adopts a modular design, and multiple modular designs enable it to achieve temperature reduction, noise reduction and gas-liquid separation at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to further illustrate the technical effect of high-temperature and high-speed flue gas treatment according to the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, wherein:

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a schematic structural diagram of the front measuring device 2;

[0033] Figure 3 It is a structural schematic diagram of the noise generating section 3;

[0034] Figure 4 It is a structural schematic diagram of the water spray cooling and noise reduction section 4;

[0035] Figure 5 It is a structural schematic diagram of the muffler 5;

[0036] Figure 6 It is a schematic structural diagram of the water collecting tank 6;

[0037] Figure 7 is a schematic structural diagram of the rear measuring device 7;

[0038] Figure 8 It is a work flow chart of the present invention;

[0039] (Figure numerals: 1 high-temperature and high-speed flue gas simulation device; 2 front measuring device; 2a pressure transmitter; 2b pitot tube; 2c temperature transmitter; 2d gas-liquid inlet model; 3 noise generating section; 3a sound absorbing device; 3b speaker; 3c speaker cooling pipe; 3d microphone; 3e microphone mounting bracket; 4 water spray cooling and noise reduction section; 4a gas container; 4b atomizing nozzle; 5 silencer; 5a silencer inner cavity; 5b silencer cotton; 6 water collecting tank; 6a corrugated plate; 6b leaking orifice plate; 6c water storage tank; 7 measuring device; 7a tail gas outlet; 7b temperature transmitter; 7c pressure transmitter; 7d pitot tube; 7e microphone;) DETAILED DESCRIPTION

[0040] The specific structure and technical effects of the present invention are described below in conjunction with the accompanying drawings:

[0041] Figure 1 It is a schematic diagram of the overall structure of the present invention, comprising a high-temperature and high-speed flue gas simulation device 1, a front measuring device 2, a noise generating section 3, a water spray cooling and noise reduction section 4, a silencer 5, a water collecting tank 6 and a rear measuring device 7; the high-temperature and high-speed flue gas simulation device 1, the front measuring device 2, the noise generating section 3, the water spray cooling and noise reduction section 4, the silencer 5, the water collecting tank 6 and the rear measuring device 7 are connected in sequence from front to back through connecting flanges.

[0042] The high-temperature and high-speed flue gas simulation device includes an air compressor, a pipeline heater and a pipeline transportation device. The device first provides a high-speed airflow through an air compressor, then heats the airflow to a specified temperature through a pipeline heater, and finally transports the high-temperature and high-speed flue gas through a pipeline transportation device.

[0043] Figure 2 A schematic diagram of the front measuring device 2 is given. The device is connected to the high-temperature and high-speed flue gas simulation device 1 through a pipeline. The front measuring device 2 is used to measure the pressure, flow rate and temperature of the high-temperature and high-speed flue gas before it enters the noise generating section. It is mainly composed of a pressure transmitter 2a, a pitot tube 2b, a temperature transmitter 2c and a gas-liquid inlet pipeline 2d. The gas-liquid inlet pipeline 2d has a similar function to the pipeline transportation device: it is mainly used to transport high-temperature and high-speed flue gas. The front end of the gas-liquid inlet pipeline 2d is provided with a pressure transmitter 2a, the middle part is provided with a pitot tube 2b, and the tail part is provided with a temperature transmitter 2c.

[0044] Figure 3A schematic diagram of the noise generating section 3 is given. The device is mainly composed of a sound absorbing device 3a, a loudspeaker 3b, a loudspeaker cooling tube 3c, a microphone 3d and a microphone mounting bracket 3e. The noise generating section 3 is located at the rear end of the front measuring device 2. The sound absorbing device 3a is the main body of the noise generating section 3. The sound absorbing device 3a is a rectangular parallelepiped pipe with connecting flanges at the front and rear ends, which can be used to transport high-temperature and high-speed smoke. A loudspeaker cooling tube 3c is placed on each plane at the front end of the sound absorbing device 3a. The top of the loudspeaker cooling tube 3c is mechanically fixed with a loudspeaker 3b for simulating noise through four circular holes. A microphone mounting bracket 3e is placed at the tail of the sound absorbing device 3. The microphone mounting bracket 3e is used to fix the microphone 3d used to detect the noise decibel. The noise generating section uses four loudspeakers to emit the noise of the sound pressure level required for the test. The loudspeaker cooling tube is cooled by water circulation to ensure that the loudspeaker is not damaged by high temperature. The microphone is used to measure the decibel size of the simulated noise.

[0045] Figure 4 A schematic diagram of a water spray cooling and noise reduction section 4 is provided. The device is mainly composed of a gas container 4a and an atomizing nozzle 4b. The gas container 4a is used as the main part to transport high-temperature, high-pressure and high-noise flue gas. The flow channel cross-sectional area of ​​the gas container 4a increases continuously from the inlet to the outlet. At the same time, atomizing nozzles 4b are arranged in three rows along the flow channel direction of the gas container 4a. The atomizing nozzle 4b sprays water into fine water droplets or mist. These water droplets evaporate in the flow channel and absorb heat in the air, thereby reducing the temperature in the flow channel. The spray reduces the temperature while increasing the density and viscosity of the air, thereby slowing down the airflow speed and reducing the noise generated by the airflow.

[0046] Figure 5 A schematic diagram of a silencer 5 is given, and the silencer 5 is mainly composed of a silencer chamber 5a and silencer cotton 5b. The silencer chamber 5a, as the main part, is a rectangular parallelepiped pipe with connecting flanges at the front and rear ends, and silencer cotton 5b is evenly arranged around the silencer chamber 5a. The silencer inner chamber is used to transport high-temperature and high-speed flue gas, and the silencer cotton is used to absorb the noise caused by the flow of high-temperature and high-speed flue gas, which can effectively reduce noise pollution during the operation of industrial equipment and ensure the quietness of the production environment and the health of operators.

[0047] Figure 6A schematic diagram of a water collecting box 6 is given, and the water collecting box 6 is mainly composed of a box body, a corrugated plate 6a, a water leakage orifice plate 6b and a water storage tank 6c. A plurality of corrugated plates 6a are arranged in the box body, and the number of corrugated plates 6a can be increased or decreased according to the requirements of the water content of the exhaust gas. The box body and the water storage tank 6c are separated by a water leakage orifice plate 6b. The corrugated plate is designed to be wavy in the plane, which can make the airflow change direction continuously when passing through, forming vortex and separation effects. When the high-temperature and high-speed flue gas treated by the water spray cooling and noise reduction section passes through the corrugated plate, due to its angle design, the direction of the airflow changes continuously, causing the droplets in the airflow to separate from the airflow due to inertia and collide with the surface of the corrugated plate. The vortex generated by the angle and the corrugated structure causes the droplets to collide with the surface of the corrugated plate and be captured. The droplets gather on the plate surface, and finally flow along the plate surface under the action of gravity, and are discharged to the water storage tank through the water leakage orifice plate.

[0048] Figure 7 The schematic diagram of the rear measuring device 7 is given. The measuring device 7 mainly consists of an exhaust outlet 7a, a temperature transmitter 7b, a pressure transmitter 7c, a pitot tube 7d and a microphone 7e. The exhaust outlet 7a is used as a carrying body to discharge high-temperature and high-speed flue gas after being cooled, denoised and decelerated. The exhaust outlet 7a is a rectangular pipe with a connecting flange at the front end, which is convenient for connection with the exhaust gas outlet 7a. Figure 6 The steam-water separation silencer section is connected, and the front end of the tail gas outlet 7a is equipped with a temperature transmitter 7b and a pressure transmitter 7c, and the tail end is equipped with a pitot tube 7d and a microphone 7e. The temperature transmitter, pressure transmitter, pitot tube, and microphone are used to measure the temperature, pressure, flow rate, and noise of the high-temperature and high-speed flue gas.

[0049] A comprehensive test device for cooling, noise reduction and water mist precipitation of high-temperature and high-speed flue gas, such as Figure 8 The steps for using it are as follows:

[0050] Step 1: Design, process and assemble the test bench, debug the air compressor, debug the pipe heater, debug the data logger, debug the noise generator and debug the water spray system.

[0051] Step 2: The air compressor outputs high-speed airflow, the pipeline heater heats the high-speed airflow, and the high-temperature and high-speed flue gas is transported through the pipeline transportation device.

[0052] Step 3: Use the temperature transmitter 2c on the front measuring device 2 to continuously detect whether the temperature reaches the test condition. If not, increase the power of the pipe heater and return to Step 2. If so, use the Pitot tube 2b on the front measuring device 2 to continuously detect whether the gas-liquid velocity reaches the test condition. If not, increase the power of the air compressor and return to Step 2. If so, proceed to the next step.

[0053] Step 4: The four speakers 3b continuously output to simulate a high noise environment in the sound absorbing device 3a, and the microphone 3d continuously detects whether the noise decibel reaches the test condition. If not, the speaker 3b is used at a higher power. If it reaches, the next step is executed. During use, the speaker continues to maintain a high temperature, and the speaker cooling pipe 3c cools the speaker through water circulation;

[0054] Step 5: When the temperature, velocity and noise environment of the flue gas meet the test conditions, the water spray cooling and noise reduction section 4 starts to work, and the three-stage atomizing nozzle 4b sprays water to continuously cool, reduce the velocity and reduce the noise of the flue gas.

[0055] Step 6: The flue gas after being cooled and decelerated passes through the silencer 5 for further noise reduction.

[0056] Step 7: The smoke after noise reduction treatment enters the water collecting box 6, and the water collecting box 6 intercepts the gas and liquid through the corrugated plate 6a. After the liquid is deposited, it flows into the water collecting box 6c through the leaking hole plate 6b.

[0057] Step 8: Before the exhaust gas is discharged, the temperature, pressure, flow rate and noise generated by the exhaust gas are measured by the temperature transmitter 7b, pressure transmitter 7c, Pitot tube 7d and microphone 7e respectively to see if they are qualified. If not, Step 5 is executed again by increasing the power.

Claims

1. A comprehensive test device for cooling, noise reduction and water mist precipitation of high-temperature and high-speed flue gas, characterized in that: It includes a high-temperature and high-speed flue gas simulation device 1, a front measuring device 2, a noise generating section 3, a water spray cooling and noise reduction section 4, a silencer 5, a water collecting tank 6 and a rear measuring device 7; the high-temperature and high-speed flue gas simulation device 1, the front measuring device 2, the noise generating section 3, the water spray cooling and noise reduction section 4, the silencer 5, the water collecting tank 6 and the rear measuring device 7 are connected in sequence from front to back through connecting flanges.

2. A comprehensive test device for cooling, noise reduction and water mist precipitation of high-temperature and high-speed flue gas as claimed in claim 1, characterized in that: The high-temperature and high-speed flue gas simulation device includes an air compressor, a pipeline heater and a pipeline transportation device. The air compressor provides high-speed airflow, the pipeline heater heats the airflow to a specified temperature, and the pipeline transportation device transports the high-temperature and high-speed flue gas.

3. A comprehensive test device for cooling, noise reduction and water mist precipitation of high-temperature and high-speed flue gas as claimed in claim 1 or 2, characterized in that: The front measuring device is used to measure the pressure, flow rate and temperature of the high-temperature and high-speed flue gas before it enters the noise generating section, and includes a pressure transmitter, a pitot tube, a temperature transmitter and a gas-liquid inlet pipeline. The gas-liquid inlet pipeline 2d is used to transport the high-temperature and high-speed flue gas; a pressure transmitter 2a is provided at the front end of the gas-liquid inlet pipeline 2d, a pitot tube 2b is provided in the middle, and a temperature transmitter 2c is provided at the tail.

4. A comprehensive test device for cooling, noise reduction and water mist precipitation for high-temperature and high-speed flue gas as claimed in claim 3, characterized in that: The noise generating section comprises a sound absorbing device, a loudspeaker, a loudspeaker cooling tube, a microphone and a microphone mounting bracket; the noise generating section 3 is located at the rear end of the front measuring device 2, the sound absorbing device 3a is the main body of the noise generating section 3, the sound absorbing device 3a is a rectangular pipe with connecting flanges at the front and rear ends, and is used to transport high-temperature and high-speed flue gas; a loudspeaker cooling tube 3c is arranged on each plane at the front end of the sound absorbing device 3a, and a loudspeaker 3b for simulating noise is mechanically fixed on the top of the loudspeaker cooling tube 3c through four circular holes; a microphone mounting bracket 3e is arranged at the tail of the sound absorbing device 3, and the microphone mounting bracket 3e is used to fix a microphone 3d for detecting noise decibels; the noise generating section uses four loudspeakers to emit the noise of the sound pressure level required for the test, the loudspeaker cooling tube is cooled by water circulation to ensure that the loudspeaker is not damaged by high temperature, and the microphone is used to measure the decibel size of the simulated noise.

5. A comprehensive test device for cooling, noise reduction and water mist precipitation of high-temperature and high-speed flue gas as claimed in claim 1 or 4, characterized in that: The water spray cooling and noise reduction section includes a gas container and an atomizing nozzle; the flow channel cross-sectional area of ​​the gas container 4a increases continuously from the inlet to the outlet, and at the same time, atomizing nozzles 4b are arranged in three rows along the flow channel direction of the gas container 4a; the gas container is used to transport high-temperature, high-pressure and high-noise flue gas; the atomizing nozzle 4b sprays water into fine water droplets or mist.

6. A comprehensive test device for cooling, noise reduction and water mist precipitation for high-temperature and high-speed flue gas as claimed in claim 5, characterized in that: The silencer includes a silencer chamber and silencer cotton; the silencer chamber is used to transport high-temperature and high-speed smoke, and silencer cotton is evenly arranged around the silencer chamber, and the silencer cotton is used to absorb the noise caused by the flow of high-temperature and high-speed smoke.

7. A comprehensive test device for cooling, noise reduction and water mist precipitation of high-temperature and high-speed flue gas as claimed in claim 1 or 6, characterized in that: The water collecting tank comprises a box body, a corrugated plate, a water leakage hole plate and a water storage tank; the corrugated plate is designed to be wavy in plane; a plurality of corrugated plates 6a are arranged in the box body, and the box body and the water storage tank 6c are separated by the water leakage hole plate 6b.

8. A comprehensive test device for cooling, noise reduction and water mist precipitation for high-temperature and high-speed flue gas as claimed in claim 7, characterized in that: The post-measurement device includes an exhaust gas outlet, a temperature transmitter, a pressure transmitter, a pitot tube, and a microphone. The exhaust gas outlet is used to discharge high-temperature and high-speed flue gas that has been treated with temperature reduction, noise reduction, and speed reduction. It is a rectangular pipe with a connecting flange at the front end; the temperature transmitter, pressure transmitter, pitot tube, and microphone are used to measure the temperature, pressure, flow rate, and noise of the high-temperature and high-speed flue gas, respectively. The temperature transmitter and pressure transmitter are installed at the front end of the exhaust gas outlet, and the pitot tube and microphone are installed at the rear end.

9. A comprehensive test method for cooling, noise reduction and water mist precipitation of high-temperature and high-speed flue gas using the comprehensive test device according to claim 8, characterized in that: The following steps are involved: Step 1: Design, process and assemble the test bench, debug the air compressor, debug the pipe heater, debug the data logger, debug the noise generator and debug the water spray system; Step 2: The air compressor outputs high-speed airflow, the pipeline heater heats the high-speed airflow, and the high-temperature and high-speed flue gas is transported through the pipeline transportation device; Step 3: Use the temperature transmitter on the front measuring device to continuously detect whether the temperature reaches the test condition. If not, increase the power of the pipe heater and return to Step 2. If it reaches, use the pitot tube on the front measuring device to continuously detect whether the gas-liquid velocity reaches the test condition. If not, increase the power of the air compressor and return to Step 2. If it reaches, proceed to the next step. Step 4: Continuously output through four speakers to simulate a high noise environment in the sound absorbing device, and continuously detect whether the noise decibel reaches the test condition through the microphone. If not, increase the power of the speaker. If it reaches, proceed to the next step. During use, the speaker continues to maintain a high temperature, and the speaker cooling pipe cools the speaker through water circulation; Step 5: When the temperature, speed and noise environment of the flue gas meet the test conditions, the water spray cooling and noise reduction section starts to work, and the three-stage atomizing nozzle sprays water to continuously cool, reduce speed and reduce noise of the flue gas; Step 6: The flue gas after cooling and speed reduction is further treated by the silencer for noise reduction; Step 7: The smoke after noise reduction treatment enters the water collecting tank, and the water collecting tank intercepts the gas and liquid through the corrugated plate. After the liquid is deposited, it flows into the water collecting tank through the leaking orifice plate; Step 8: Before the exhaust gas is discharged, the temperature, pressure, flow rate and noise generated by the exhaust gas are measured by the temperature transmitter, pressure transmitter, Pitot tube and microphone to see if they are qualified. If not, re-execute Step 5 by increasing the power.

10. A comprehensive test device for cooling, noise reduction and water mist precipitation for high-temperature and high-speed flue gas according to claim 8, characterized in that: The present invention uses atomized water spraying to reduce temperature and noise, which is low-cost but effective; the device is easy to install and easy to promote and apply through mechanical connections such as bolts and nuts; the device adopts a modular design, and multiple modular designs enable it to achieve temperature reduction, noise reduction and gas-liquid separation at the same time.

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