A gas sample temperature control system

Abstract

The present application relates to sample gas component measurement analysis technical field, specifically to a kind of gas sample gas temperature control system, comprising: sensor measures gas temperature;Water pump is connected with the water cooling ring cavity being equipped in sampling rake;Frequency converter is connected with water pump;Bypass valve is arranged between water pump and water cooling ring cavity;When sensor temperature is lower than set, first frequency converter reduces frequency, reduces water pump speed, then bypass valve opening increases, reduces cooling water flow;When sensor temperature is higher than set, first frequency converter increases frequency, improves water pump speed, then bypass valve opening reduces, increases cooling water flow;The present application is through the linkage adjustment of frequency converter adjustment water pump speed and bypass valve opening, realizes the control of cooling water flow and gas temperature, can more quickly, more stable and more accurately adjust gas sample gas temperature, improves control precision and the stability of gas sample gas temperature.

Description

Technical Field

[0001] This invention relates to the field of sample gas composition measurement and analysis technology, specifically to a gas sample temperature control system. Background Technology

[0002] Aero engines are hailed as the "crown jewel of industry," reflecting a nation's technological development level and comprehensive national strength. With increasing environmental awareness, civil aero engines are developing towards lower emissions.

[0003] Regarding emissions from civil aircraft engines, the Committee on Aviation Environmental Protection (CAEP) of the International Civil Aviation Organization (ICAO) has established a series of emission standards since 1980. These standards primarily specify pollutants including soot, carbon monoxide (CO), unburned hydrocarbons (UHC), and nitrogen oxides (NOx). x The emission standards for soot, carbon monoxide, and unburned hydrocarbons remained largely unchanged from the CAEP / 2 standard to the CAEP / 8 standard, but the emission standards for NO changed. x Emission requirements are becoming increasingly stringent; the CAEP / 6 standard specifies NO... x The emission standard is 12% lower than the CAEP / 4 standard, and the CAEP / 8 standard specifies NO. x The emission standards are 15% lower than those stipulated in the CAEP / 6 standard. The newly introduced CAEP / 10 standard in 2016 also introduced new regulations for particulate matter (also known as ultrafine particulate matter) and CO2 emissions. Civil aircraft engines must meet the pollution emission requirements of the International Civil Aviation Organization (ICAO) to obtain airworthiness certification.

[0004] Therefore, it is necessary to design a reasonable gas analysis system to ensure the accuracy of component concentration measurement in all aspects, including sampling, pretreatment, concentration measurement and data analysis, so as to provide technical support for the design and development of low-emission combustion chambers and the airworthiness certification of civil aircraft engines.

[0005] In high-temperature and high-pressure environments, a water-cooled sampling rake is typically used to extract sample gas from the combustion chamber for component concentration measurement. The water-cooling structure ensures the sampling rake is not ablated by the combustion gas and maintains a relatively constant sample gas temperature to guarantee extraction and analysis at an appropriate temperature, thus improving the accuracy of combustion gas component concentration measurements. If the extracted sample gas temperature is too high, the chemical reactions within the gas may not freeze; if the extracted sample gas temperature is too low, UHC and nitrogen oxides may condense, both significantly impacting the combustion gas component concentration measurement results. However, it is difficult to achieve a combustion gas sample temperature that meets the sampling requirements. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the temperature of the gas sample is difficult to meet the sampling requirements.

[0007] To overcome the above-mentioned defects, the present invention provides a gas sample temperature control system, comprising:

[0008] The sensor is suitable for measuring the temperature of the gas sample obtained by the sampling rake;

[0009] A water pump is connected to a water-cooled annular cavity provided inside the sampling rake via a pipeline, and the water pump is adapted to provide cooling water to the water-cooled annular cavity;

[0010] The frequency converter is connected to the water pump;

[0011] A bypass valve is provided between the water pump and the water-cooled annular cavity, and the bypass valve is adapted to regulate the flow rate of cooling water flowing into the water-cooled annular cavity;

[0012] The controller is signal-connected to the sensor, frequency converter, and bypass valve. The controller has a first state where, when the temperature measured by the sensor is lower than the set temperature range, the controller first controls the frequency converter to reduce the frequency, thereby reducing the speed of the water pump, and then controls the opening of the bypass valve to increase, so as to reduce the flow rate of cooling water entering the water-cooled annular cavity; and a second state where, when the temperature measured by the sensor is higher than the set temperature range, the controller first controls the frequency converter to increase the frequency, thereby increasing the speed of the water pump, and then controls the opening of the bypass valve to decrease, so as to increase the flow rate of cooling water entering the water-cooled annular cavity.

[0013] Optionally, the set temperature range is 150-180℃.

[0014] Optionally, a pressure transmitter is provided on the pipeline connecting the bypass valve and the water-cooled annular cavity; the pressure transmitter is signal-connected to the controller.

[0015] The pressure transmitter is adapted to send a signal to the controller when the pressure of the cooling water in the pipeline exceeds a first threshold or falls below a second threshold. The controller then displays the pressure value and issues an alarm for any abnormality.

[0016] Optionally, a flow meter is provided on the pipeline connecting the bypass valve and the water-cooled annular cavity; the flow meter is signal-connected to the controller.

[0017] The flow meter is adapted to send a signal to the controller when the flow rate of cooling water in the pipeline exceeds the third threshold or falls below the fourth threshold. The controller then displays the flow rate value and issues an alarm for any abnormality.

[0018] Optionally, when the sampling rake is an independent sampling rake, the sampling rake is provided with multiple sampling tubes, which are adapted to introduce the gas into the component concentration analysis system; the sensor is provided in each sampling tube.

[0019] Optionally, when the sampling rake is a mixed sampling rake, the sensor includes: a first sensor and a second sensor;

[0020] The sampling rake is equipped with multiple sampling tubes, and the sampling port of the sampling tube is suitable for introducing gas.

[0021] Multiple sampling tubes are connected to a mixing chamber inside the sampling rake; the mixing chamber is connected to a mixed sample gas outlet pipe; the mixed sample gas outlet pipe is connected to a component concentration analysis system via a sample gas transport pipe; the connection point between the mixed sample gas outlet pipe and the sample gas transport pipe is the sample gas outlet.

[0022] In the mixed sampling rake, the first sensor is located inside the mixing chamber; the second sensor is located inside the mixed sample gas outlet pipe near the sample gas outlet.

[0023] Optionally, the sampling port of the sampling tube is positioned facing the flow direction of the gas.

[0024] Optionally, the outside of the mixed sample gas outlet tube is wrapped with thermal insulation material.

[0025] Optionally, an electric heat tracing structure is provided on the sample gas transport pipe; the electric heat tracing structure is connected to the controller, and the electric heat tracing structure is adapted to maintain a set temperature range under the control of the controller.

[0026] Optionally, a pretreatment tank is connected upstream of the water pump; the pretreatment tank is adapted to provide filtered and softened cooling water.

[0027] The technical solution of the present invention has the following advantages compared with the prior art:

[0028] 1. The present invention provides a gas sample temperature control system, comprising: a sensor adapted to measure the temperature of a gas sample obtained by a sampling rake; a water pump connected to a water-cooled annular cavity within the sampling rake via a pipeline, the water pump being adapted to provide cooling water to the water-cooled annular cavity; a frequency converter connected to the water pump; a bypass valve disposed between the water pump and the water-cooled annular cavity, the bypass valve being adapted to regulate the flow rate of cooling water flowing into the water-cooled annular cavity; and a controller connected to the sensor, frequency converter, and bypass valve via signal connections. The controller has a first state where, when the temperature measured by the sensor is lower than a set temperature range, the controller first controls the frequency converter to reduce its frequency, thereby reducing the speed of the water pump, and then controls the opening of the bypass valve to increase, thereby reducing the flow rate of cooling water entering the water-cooled annular cavity; and a second state where, when the temperature measured by the sensor is higher than a set temperature range, the controller first controls the frequency converter to increase its frequency, thereby increasing the speed of the water pump, and then controls the opening of the bypass valve to decrease, thereby increasing the flow rate of cooling water entering the water-cooled annular cavity. This application adopts the above technical solution, by employing… The inverter regulates the water pump speed and bypass valve opening in a coordinated manner to control the cooling water flow and gas temperature. When the temperature difference between the actual sample gas temperature and the target temperature is large, the water flow is coarsely adjusted by increasing the water pump speed. Once the temperature difference narrows, the water flow is finely adjusted by changing the bypass valve opening. This allows for faster, more stable, and more accurate adjustment of the gas sample temperature, improving control precision and temperature stability. It ensures the gas sample temperature meets sampling requirements during sampling, effectively improving the validity of gas analysis data. Specifically, the system automatically determines the adjustment amount of the water pump speed and bypass valve opening based on the difference between the temperature signal input and the set value, thereby controlling the cooling water flow and gas sample temperature. This automatic gas sample temperature control system reduces problems caused by human operation, such as large differences in gas component concentration or low data validity, effectively improving the reliability of experimental data. After the gas operating conditions stabilize, it ensures the gas sample temperature is quickly adjusted to the target value, thus shortening the test time and significantly reducing test costs. Furthermore, by setting up a water-cooled annular cavity, not only is the sampling rake prevented from being burned, but the chemical reactions in the gas sample can also be frozen.

[0029] 2. The temperature range set in this invention is 150-180℃. Using the above technical solution, if the temperature of the extracted gas sample is too high, the chemical reactions in the gas sample will not freeze; if the temperature of the extracted gas sample is too low, UHC and nitrogen oxides will condense, both of which will significantly affect the measurement results of gas component concentration. Therefore, to ensure that the gas sample is extracted and analyzed at a suitable temperature and to improve the accuracy of gas component concentration measurement, the temperature of the gas sample is limited to between 150-180℃.

[0030] 3. The present invention includes a pressure transmitter on the bypass valve and the water-cooled annular cavity connecting pipeline; the pressure transmitter is signal-connected to the controller; the pressure transmitter is adapted to send a signal to the controller when the pressure of the cooling water in the pipeline exceeds a first threshold or falls below a second threshold, the controller displays the pressure value and issues an abnormal alarm; the present application adopts the above technical solution, by using a pressure transmitter to measure and monitor the pressure of the cooling water, and using the pressure signal of the cooling water as the signal input of the controller, when the pressure of the cooling water suddenly increases or drops to an abnormal value, an alarm will be triggered to quickly intervene, thereby avoiding the burning or damage of the sampling rake and improving the service life of the sampling rake and downstream analytical instruments.

[0031] 4. The present invention includes a flow meter on the connecting pipeline between the bypass valve and the water-cooled annular cavity; the flow meter is signal-connected to the controller; the flow meter is adapted to send a signal to the controller when the flow rate of the cooling water in the pipeline exceeds a third threshold or falls below a fourth threshold, the controller displays the flow rate value and issues an abnormal alarm; the present application adopts the above technical solution, by using a flow meter to measure and monitor the flow rate of the cooling water, and using the flow rate signal of the cooling water as the signal input of the controller, when the flow rate of the cooling water suddenly increases or drops to an abnormal value, an alarm will be triggered to quickly intervene, thereby avoiding the burning or damage of the sampling rake and improving the service life of the sampling rake and downstream analytical instruments.

[0032] 5. When the sampling rake is an independent sampling rake, the sampling rake is provided with multiple sampling tubes, which are suitable for introducing the gas into the component concentration analysis system; the sensor is provided in each sampling tube; the present application adopts the above technical solution, and for the independent sampling method, by monitoring the temperature at multiple points, the flow rate of cooling water is controlled in real time, thereby ensuring the temperature stability of the gas sample.

[0033] 6. When the sampling rake is a mixed sampling rake, the sensor includes: a first sensor and a second sensor; multiple sampling tubes are provided on the sampling rake, and the sampling ports of the sampling tubes are suitable for introducing gas; the multiple sampling tubes are connected to a mixing chamber provided inside the sampling rake; the mixing chamber is connected to a mixed sample gas outlet pipe; the mixed sample gas outlet pipe is connected to a component concentration analysis system through a sample gas transport pipe; the connection between the mixed sample gas outlet pipe and the sample gas transport pipe is the sample gas outlet; the first sensor is disposed inside the mixing chamber; the second sensor is disposed inside the mixed sample gas outlet pipe near the sample gas outlet; this application adopts the above technical solution, and for the mixed sampling method, by monitoring the temperature at two locations and controlling the flow rate of cooling water in real time, the temperature of the gas sample is ensured to be stable.

[0034] 7. The sampling port of the sampling tube described in this invention is positioned directly opposite the flow direction of the gas; this application adopts the above technical solution to guide the gas sample into the sampling rake to the maximum extent.

[0035] 8. The present invention wraps the outside of the mixed sample gas outlet pipe with heat insulation material; the above technical solution is adopted in this application to ensure the temperature stability of the gas sample and reduce the influence of the external environment on the temperature of the gas sample.

[0036] 9. The present invention provides an electric heat tracing structure on the sample gas transport pipe; the electric heat tracing structure is connected to a controller, and the electric heat tracing structure is adapted to maintain a set temperature range under the control of the controller; the present application adopts the above technical solution, and through the electric heat tracing structure, the temperature of the gas sample is stabilized within the set temperature range.

[0037] 10. The present invention has a pretreatment water tank connected upstream of the water pump; the pretreatment water tank is suitable for providing filtered and softened cooling water; the present application adopts the above technical solution to ensure the provision of reliable cooling water, prevent pipeline blockage, and avoid affecting the temperature control effect of the gas sample. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the internal and external connection structure of the gas sample temperature control system provided in the embodiment of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Exhaust section; 2. Gas; 3. Sampling port; 4. Sampling rake; 5. Sampling tube; 6. Water-cooled annular cavity; 7. Mixing chamber; 8. Sample gas outlet; 9. Water inlet pipe; 10. Water outlet pipe; 11. First sensor; 12. Second sensor; 13. Mixed sample gas outlet pipe; 14. Sample gas transport pipe; 15. Component concentration analysis system; 16. Controller; 17. Pressure transmitter; 18. Flow meter; 19. Bypass valve; 20. Frequency converter; 21. Water pump; 22. Pretreatment water tank; 23. Gas exhaust system; 24. Sampling and analysis system. Detailed Implementation

[0042] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] like Figure 1 One specific embodiment of the gas sample temperature control system shown includes: a sensor, a controller 16, a frequency converter 20, a water pump 21, and a bypass valve 19 connected in sequence.

[0047] The sensor is adapted to measure the temperature of the gas sample obtained by the sampling rake 4. The water pump 21 is connected to the water-cooled annular cavity 6 provided in the sampling rake 4 through a pipeline, and the water pump 21 is adapted to provide cooling water to the water-cooled annular cavity 6; the bypass valve 19 (also known as a bypass valve) is provided between the water pump 21 and the water-cooled annular cavity 6, and the bypass valve 19 is adapted to regulate the flow rate of cooling water flowing into the water-cooled annular cavity 6. The controller 16 is signal-connected to the sensor, frequency converter 20, and bypass valve 19. The controller 16 has a first state where, when the temperature measured by the sensor is lower than the set temperature range, the controller 16 first controls the frequency converter 20 to decrease its frequency, thereby reducing the speed of the water pump 21, and then controls the bypass valve 19 to increase its opening to reduce the flow rate of cooling water entering the water-cooled annular cavity 6. It also has a second state where, when the temperature measured by the sensor is higher than the set temperature range, the controller 16 first controls the frequency converter 20 to increase its frequency, thereby increasing the speed of the water pump 21, and then controls the bypass valve 19 to decrease its opening to increase the flow rate of cooling water entering the water-cooled annular cavity 6. Specifically, the set temperature range is 150-180℃.

[0048] Furthermore, a pressure transmitter 17 is provided on the pipeline connecting the bypass valve 19 and the water-cooled annular cavity 6; the pressure transmitter 17 is signal-connected to the controller 16; the pressure transmitter 17 is adapted to send a signal to the controller 16 when the pressure of the cooling water in the pipeline exceeds a first threshold or falls below a second threshold, and the controller 16 displays the pressure value and issues an abnormal alarm. A flow meter 18 is provided on the pipeline connecting the bypass valve 19 and the water-cooled annular cavity 6; the flow meter 18 is signal-connected to the controller 16; the flow meter 18 is adapted to send a signal to the controller 16 when the flow rate of the cooling water in the pipeline exceeds a third threshold or falls below a fourth threshold, and the controller 16 displays the flow rate value and issues an abnormal alarm. The first threshold, second threshold, third threshold, and fourth threshold are all empirical values. A pretreatment water tank 22 is connected upstream of the water pump 21; the pretreatment water tank 22 is adapted to provide filtered and softened cooling water.

[0049] When the independent sampling method is adopted, the sampling rake 4 is an independent sampling rake, and multiple sampling tubes 5 are provided on the sampling rake 4. The multiple sampling tubes 5 are suitable for introducing the gas 2 into the component concentration analysis system 15; the sensor is provided in each sampling tube 5.

[0050] When a mixed sampling method is used, the sampling rake 4 is a mixed sampling rake. The sensors include: a first sensor 11 and a second sensor 12; multiple sampling tubes 5 are provided on the sampling rake 4 (in... Figure 1(There are five sampling tubes in total). The sampling port 3 of the sampling tube 5 is suitable for introducing gas 2. The multiple sampling tubes 5 are connected to the mixing chamber 7 set in the sampling rake 4. The mixing chamber 7 is connected to the mixed sample gas outlet tube 13. The mixed sample gas outlet tube 13 is connected to the component concentration analysis system 15 through the sample gas transport tube 14. The connection between the mixed sample gas outlet tube 13 and the sample gas transport tube 14 is the sample gas outlet 8. The first sensor 11 is set in the mixing chamber 7. The second sensor 12 is set in the mixed sample gas outlet tube 13 near the sample gas outlet 8. The temperature of the measuring point where the second sensor 12 is located can be controlled between 150-180℃. The temperature of the measuring point where the first sensor 11 is located is slightly higher than the temperature of the measuring point where the second sensor 12 is located. The outside of the mixed sample gas outlet tube 13 is wrapped with thermal insulation material. An electric heat tracing structure is provided on the sample gas transport pipe 14; the electric heat tracing structure is connected to the controller 16, and the electric heat tracing structure is adapted to maintain a set temperature range under the control of the controller 16. Specifically, the set temperature range is 150-180℃.

[0051] In both sampling methods described above, the sampling port 3 of the sampling tube 5 is positioned directly opposite the flow direction of the gas 2. The gas 2 is supplied by the gas exhaust system 23, and is a high-temperature gas. The gas exhaust system 23 consists of an exhaust section 1 and its related accessories. When conducting research on the emission characteristics of pollutants from aero-engines or ground-based gas turbines, the upstream section is connected to the gas turbine or turbine components. When conducting research on combustion chamber design and development and pollutant emission characteristics testing, the upstream section can be directly connected to the combustion chamber components. The sampling rake 4 and the component concentration analysis system 15 both belong to the sampling analysis system 24. The sampling analysis system 24 is used for extracting gas samples and measuring component concentrations. The sampling rake 4 is installed on the exhaust section 1. The water-cooled annular cavity 6 is connected to an inlet pipe 9 and an outlet pipe 10. The inlet pipe 9 is connected to a pressure transmitter 17.

[0052] The technical solution of this application is not only applicable to the measurement of gas component concentration in aero engines or gas turbines, but also applicable to the measurement of sample gas component concentration in high-temperature environments such as chemical plants.

[0053] The main working process of the gas sample temperature control system described in this application is briefly described as follows: The high-temperature gas in the exhaust section 1 enters the corresponding independent sampling pipe 5 through multiple sampling ports 3 on the sampling rake 4, and then is uniformly mixed into a mixed sample gas in the mixing chamber 7. The mixed sample gas enters the component concentration analysis system 15 through the mixed sample gas outlet pipe 13 and the sample gas transport pipe 14 for component concentration analysis and measurement of the gas sample gas. The water pump 21 pressurizes the cooling water in the pretreatment water tank 22 and divides it into two paths: a main path and a bypass path. The cooling water in the main path enters the water-cooled annular cavity 6 from the cooling water inlet pipe 9 through the flow meter 18 and the pressure transmitter 17. On the one hand, it protects the sampling rake 4 through heat exchange with the shell of the sampling rake 4 to ensure that the sampling rake 4 will not be burned in the high-temperature gas. On the other hand, it cools the sample gas through heat exchange with the independent sampling pipe 5 to freeze the chemical reaction in the gas sample gas, thereby effectively improving the data validity of the gas analysis. The cooling water in the bypass path passes through the bypass valve 19. The controller 16 adjusts the frequency of the inverter 20 and the opening of the bypass valve 19 to control the cooling water flow rate, thereby controlling the gas sample temperature within the required range. The gas sample temperature is measured and fed back by the first sensor 11 and the second sensor 12. When the temperature of the mixing chamber 7 is lower than the set temperature range, the controller 16 receives a temperature signal that is also lower than the set temperature range. At this time, the controller 16 issues a control signal to appropriately reduce the frequency of the inverter 20 and simultaneously increase the opening of the bypass valve 19 to reduce the cooling water flow rate entering the water-cooled annular chamber 6, thereby reducing the gas sample temperature. When the temperature of the mixing chamber 7 is higher than the set temperature range, the controller 16 receives a temperature signal that is also higher than the set temperature range. At this time, the controller 16 issues a control signal to appropriately increase the frequency of the inverter 20 and simultaneously decrease the opening of the bypass valve 19 to increase the cooling water flow rate entering the water-cooled annular chamber 6, thereby increasing the gas sample temperature. During the gas sample adjustment process, the amount of change of the coarse adjustment signal and the amount of change of the fine adjustment signal are determined based on the difference between the input value of the temperature signal and the set temperature range, so as to improve the control accuracy and the stability of the gas sample temperature, and ensure that the gas sample temperature can be quickly adjusted to the target value after the gas operating conditions are stable.

[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A gas sample temperature control system, characterized in that, include: The sensor is suitable for measuring the temperature of the gas sample obtained by the sampling rake (4); The water pump (21) is connected to the water-cooled annular cavity (6) provided in the sampling rake (4) through a pipeline, and the water pump (21) is adapted to provide cooling water to the water-cooled annular cavity (6); The frequency converter (20) is connected to the water pump (21); A bypass valve (19) is provided between the water pump (21) and the water-cooled annular cavity (6). The bypass valve (19) is adapted to regulate the flow rate of cooling water flowing into the water-cooled annular cavity (6). The controller (16) is signal-connected to the sensor, the frequency converter (20), and the bypass valve (19). The controller (16) has a first state where, when the temperature measured by the sensor is lower than the set temperature range, the controller (16) first controls the frequency converter (20) to reduce the frequency, thereby reducing the speed of the water pump (21), and then controls the opening of the bypass valve (19) to increase, so as to reduce the flow rate of cooling water entering the water-cooled ring cavity (6); and a second state where, when the temperature measured by the sensor is higher than the set temperature range, the controller (16) first controls the frequency converter (20) to increase the frequency, thereby increasing the speed of the water pump (21), and then controls the opening of the bypass valve (19) to decrease, so as to increase the flow rate of cooling water entering the water-cooled ring cavity (6). When the sampling rake (4) is a mixed sampling rake, the sensor includes: a first sensor (11) and a second sensor (12). Multiple sampling tubes (5) are provided on the sampling rake (4), and the sampling port (3) of the sampling tube (5) is suitable for introducing gas (2); Multiple sampling tubes (5) are connected to a mixing chamber (7) inside the sampling rake (4); the mixing chamber (7) is connected to a mixed sample gas outlet pipe (13); the mixed sample gas outlet pipe (13) is connected to a component concentration analysis system (15) through a sample gas transport pipe (14); the connection between the mixed sample gas outlet pipe (13) and the sample gas transport pipe (14) is the sample gas outlet (8); The first sensor (11) is disposed in the mixing chamber (7); the second sensor (12) is disposed in the mixed sample gas outlet pipe (13) near the sample gas outlet (8); The outside of the mixed sample gas outlet pipe (13) is wrapped with thermal insulation material; An electric heat tracing structure is provided on the sample gas transport pipe (14); the electric heat tracing structure is connected to the controller (16), and the electric heat tracing structure is adapted to maintain a set temperature range under the control of the controller (16).

2. The gas sample temperature control system according to claim 1, characterized in that, The set temperature range is 150-180℃.

3. The gas sample temperature control system according to claim 1, characterized in that, A pressure transmitter (17) is provided on the connecting pipeline between the bypass valve (19) and the water-cooled annular cavity (6); the pressure transmitter (17) is signal-connected to the controller (16); The pressure transmitter (17) is adapted to send a signal to the controller (16) when the pressure of the cooling water in the pipeline exceeds the first threshold or is lower than the second threshold. The controller (16) then displays the pressure value and issues an abnormal alarm.

4. The gas sample temperature control system according to claim 1, characterized in that, A flow meter (18) is provided on the pipeline connecting the bypass valve (19) and the water-cooled annular cavity (6); the flow meter (18) is signal-connected to the controller (16); The flow meter (18) is adapted to send a signal to the controller (16) when the flow rate of cooling water in the pipeline exceeds the third threshold or is lower than the fourth threshold. The controller (16) then displays the flow rate value and issues an abnormal alarm.

5. The gas sample temperature control system according to any one of claims 1-4, characterized in that, When the sampling rake (4) is an independent sampling rake, the sampling rake (4) is provided with multiple sampling tubes (5), and the multiple sampling tubes (5) are suitable for introducing the gas (2) into the component concentration analysis system (15); the sensor is provided in each sampling tube (5).

6. The gas sample temperature control system according to claim 1, characterized in that, The sampling port (3) of the sampling tube (5) is positioned directly opposite the flow direction of the gas (2).

7. The gas sample temperature control system according to any one of claims 1-4, characterized in that, A pretreatment tank (22) is connected upstream of the water pump (21); the pretreatment tank (22) is adapted to provide filtered and softened cooling water.

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