Sample gas temperature control device for gas analysis test

Abstract

The application provides a sample gas temperature control device for a gas analysis test, which is suitable for an aero-engine combustion chamber and comprises a sampling rake, a cabinet, a sample gas temperature control device and a first temperature sensor. The sampling rake is used for sampling the gas at the outlet of the aero-engine or the combustion chamber. The first temperature sensor is arranged at the outlet of the sampling rake and is used for measuring the sample gas temperature at the outlet of the sampling rake. The sample gas at the outlet of the sampling rake flows into the cabinet through a first electric heat tracing pipe. The sample gas temperature control device is connected with the cabinet and is used for controlling the temperature at the outlet of the sampling rake. When the sample gas temperature at the outlet of the sampling rake is lower than a predetermined temperature, the sample gas temperature control device is opened, the flow rate through the sampling rake is increased, and the temperature at the outlet of the sampling rake is increased. The application can ensure that the sample gas at the outlet of the sampling rake does not condense when the aero-engine and the combustion chamber are in the slow-speed state and the sub-slow-speed state, and the measured pollution emission and combustion efficiency are accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas analysis test of aero-engine and gas turbine, and particularly relates to a sample gas temperature control device for gas analysis test, which is suitable for a combustion chamber of an aero-engine. BACKGROUND

[0002] During airworthiness certification, the aero-engine needs to carry out pollution emission test in the conditions of slow vehicle, climbing, returning to the field and taking off to verify whether the pollution emission performance meets the requirements of ICAO specification. In addition, with the continuous development of gas analysis technology, it is a mainstream method to measure the combustion efficiency of the combustion chamber of the aero-engine by using the gas analysis method, and the test conditions include sub-slow vehicle, slow vehicle, climbing, returning to the field and taking off.

[0003] In the conditions of slow vehicle and sub-slow vehicle, the combustion chamber inlet pressure and temperature are low, so the gas temperature at the outlet of the combustion chamber or the aero-engine is also relatively low. At this time, the sample gas temperature at the outlet of the sampling rake is lower than 145 DEG C required by the ICAO specification. When the sample gas temperature is lower than 145 DEG C, the components such as UHC and H2O in the sample gas will condense, which affects the measurement results of UHC, H2O and the like, and further affects the calculation results of the combustion efficiency, pollution emission index and the like.

[0004] In order to ensure that the accurate gas component concentration and the accurate combustion efficiency, pollution emission index and the like can be obtained in the conditions of slow vehicle and sub-slow vehicle, it is necessary to ensure that the components such as UHC and H2O in the sample gas do not condense.

[0005] However, in the prior art, the sample gas temperature at the outlet of the sampling rake is lower than 145 DEG C required by the ICAO specification in the conditions of slow vehicle and sub-slow vehicle, which causes the condensation of the sample gas components such as UHC and H2O, resulting in inaccurate measurement results and inaccurate calculation results of the combustion efficiency and pollution emission index. Therefore, a device capable of controlling the sample gas temperature at the outlet of the sampling rake to meet the specification requirements needs to be designed.

[0006] Therefore, the present application provides a sample gas temperature control device for gas analysis test to overcome the above technical problems. SUMMARY

[0007] The present application aims to solve the technical problem that the sample gas temperature at the outlet of the sampling rake is lower than the specification requirements in the prior art, resulting in inaccurate measurement results and inaccurate calculation results of the combustion efficiency and pollution emission index, and provides a sample gas temperature control device for gas analysis test.

[0008] The present application solves the above technical problems by the following technical scheme:

[0009] The application discloses a sample gas temperature control device for gas analysis test, which is suitable for a combustion chamber of an aero-engine, and has the characteristics that the device comprises a sampling rake, a cabinet, a sample gas temperature control device and a first temperature sensor, the sampling rake is used for sampling the gas at the outlet of the aero-engine or the combustion chamber, and the first temperature sensor is arranged at the outlet of the sampling rake and used for measuring the temperature of the sample gas at the outlet of the sampling rake.

[0010] The sample gas at the outlet of the sampling rake flows into the cabinet through a first electric heat tracing pipe, the sample gas temperature control device is connected with the cabinet and used for controlling the temperature at the outlet of the sampling rake, and when the temperature of the sample gas at the outlet of the sampling rake is lower than a predetermined temperature, the sample gas temperature control device is opened to increase the flow rate of the sample gas flowing through the sampling rake and to increase the temperature at the outlet of the sampling rake.

[0011] According to one embodiment of the application, the cabinet comprises a first on-off valve, a first three-way valve, a pressure reducing valve, a first air pump and a second three-way valve, the sample gas at the outlet of the sampling rake flows into the cabinet through the first on-off valve and the first three-way valve in sequence, then the sample gas is divided into a first branch and a second branch, the pressure reducing valve is arranged in the first branch, the first air pump is arranged in the second branch, and the sample gas flowing through the first branch and the second branch is combined and then flows into the second three-way valve.

[0012] According to one embodiment of the application, the cabinet further comprises a filter, and the sample gas flowing out of the second three-way valve flows out of the cabinet through the filter.

[0013] According to one embodiment of the application, the sample gas temperature control device comprises an analog pneumatic regulating valve, a first pneumatic on-off valve and a second pneumatic on-off valve, the analog pneumatic regulating valve is used for adjusting the opening degree according to the temperature of the sample gas at the outlet of the sampling rake.

[0014] The sample gas at the outlet of the sampling rake enters the analog pneumatic regulating valve, then the sample gas is divided into a third branch and a fourth branch, the first pneumatic on-off valve is arranged in the third branch, the second pneumatic on-off valve is arranged in the fourth branch, and the sample gas flowing through the third branch and the fourth branch is combined and then discharged into the atmosphere.

[0015] According to one embodiment of the application, the sample gas temperature control device further comprises at least one fifth branch and a second air pump, the second air pump is arranged in the fourth branch and located behind the second pneumatic on-off valve.

[0016] The fifth branch is connected with the analog pneumatic regulating valve in parallel, and a third pneumatic on-off valve and a needle valve are arranged in each fifth branch in sequence.

[0017] According to one embodiment of the present application, the sample gas flowing out of the cabinet is divided into a sixth branch, a seventh branch and an eighth branch, the sample gas is discharged into the atmosphere after passing through a UHC analyzer by the sixth branch, the sample gas is discharged into the atmosphere after passing through a NO X X analyzer by the seventh branch, and the sample gas enters a CO and CO2 analyzer after passing through a condenser by the eighth branch and is then discharged into the atmosphere.

[0018] According to one embodiment of the present application, the sample gas in the sixth branch enters the UHC analyzer through a second electrically heated heat preservation pipe, and the sample gas in the seventh branch enters the NO X X analyzer through a third electrically heated heat preservation pipe.

[0019] According to one embodiment of the present application, the temperature of the second electrically heated heat preservation pipe is 160℃, and the temperature of the third electrically heated heat preservation pipe is 65℃.

[0020] According to one embodiment of the present application, the cabinet further comprises an electric heater and a second temperature sensor, the electric heater is used for warming the cabinet, and the second temperature sensor is used for measuring the temperature in the cabinet.

[0021] According to one embodiment of the present application, the outlet of the sampling rake is further provided with a pressure sensor for measuring the sample gas pressure at the outlet of the sampling rake.

[0022] The positive progress effect of the present application is that:

[0023] The sample gas temperature control device for gas analysis test of the present application is used in cooperation with a gas analysis system, controls the sample gas temperature at the outlet of the sampling rake by controlling the sample gas flow through the sampling rake, ensures that the sample gas temperature at the outlet of the sampling rake meets the specification requirements in the slow and sub-slow states, the sample gas composition does not condense, and the measurement result is accurate.

[0024] The sample gas temperature control device can ensure that the sample gas at the outlet of the sampling rake does not condense in the slow and sub-slow states of the aero-engine and its combustion chamber, and the measured pollution emission and combustion efficiency are accurate. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other features, properties and advantages of the present application will become more apparent through the following description with reference to the accompanying drawings and embodiments, in which the same reference numerals always denote the same features, and wherein:

[0026] Figure 1 The working principle diagram of the sample gas temperature control device for gas analysis test of the present application.

[0027] Figure 2The working principle diagram of the sample gas temperature control device for the sample gas temperature control device for gas analysis test of the present application.

[0028]

Reference Signs

[0029] Sampling rake 10

[0030] Cabinet 20

[0031] Sample gas temperature control device 30

[0032] First temperature sensor 40

[0033] First electric heat tracing pipe 11

[0034] Pressure sensor 12

[0035] First on-off valve 21

[0036] First three-way valve 22

[0037] Pressure reducing valve 23

[0038] First air suction pump 24

[0039] First branch B1

[0040] Second branch B2

[0041] Second three-way valve 25

[0042] Safety valve 231

[0043] Filter 26

[0044] Electric heater 27

[0045] Second temperature sensor 28

[0046] Analog pneumatic regulating valve 31

[0047] First pneumatic on-off valve 32

[0048] Second pneumatic on-off valve 33

[0049] Third branch B3

[0050] Fourth branch B4

[0051] Fifth branch B5

[0052] Second air suction pump 34

[0053] Third pneumatic on-off valve 35

[0054] Needle valve 36

[0055] Sixth branch B6

[0056] Seventh branch B7

[0057] Eighth branch B8

[0058] UHC analyzer 50

[0059] NO X Analyzer 60

[0060] Condenser 70

[0061] CO and CO2 analyzer 80

[0062] Second electric heat tracing pipe 100

[0063] Third electric heat tracing pipe 200 DETAILED DESCRIPTION

[0064] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0065] Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is provided to assist in a comprehensive understanding of the present application by those of ordinary skill in the art. Accordingly, the present application should not be construed as being limited to the embodiments set forth herein.

[0066] Further, although the terms used in the present application are selected from publicly-known and used terms, some of the terms mentioned in the specification of the present application can be selected by the applicant at his or her discretion, with their detailed meanings being described in relevant parts of the description herein.

[0067] Further, the present application should not be construed as being limited only to the practical terms used, but also to the meanings implied by each term.

[0068] Figure 1 The working principle diagram of the sample gas temperature control device for gas analysis test of the present application.

[0069] As Figure 1As shown, the application discloses a sample gas temperature control device for gas analysis test, which is suitable for an aero-engine combustion chamber and comprises a sampling rake 10, a cabinet 20, a sample gas temperature control device 30 and a first temperature sensor 40. The sampling rake 10 is used for sampling the gas at the outlet of the aero-engine or the combustion chamber. The first temperature sensor 40 is arranged at the outlet of the sampling rake 10 and used for measuring the temperature of the sample gas at the outlet of the sampling rake 10. The sample gas at the outlet of the sampling rake 10 flows into the cabinet 20 through a first electric heat tracing pipe 11. The sample gas temperature control device 30 is connected with the cabinet 20 and used for controlling the temperature at the outlet of the sampling rake 10. When the temperature of the sample gas at the outlet of the sampling rake 10 is lower than a predetermined temperature, the sample gas temperature control device 30 is opened, and the temperature at the outlet of the sampling rake 10 is increased by increasing the flow rate of the sample gas flowing through the sampling rake 10.

[0070] The outlet of the sampling rake 10 is preferably provided with a pressure sensor 12, which is used for measuring the pressure of the sample gas at the outlet of the sampling rake 10.

[0071] Preferably, the cabinet 20 comprises a first on-off valve 21, a first three-way valve 22, a pressure reducing valve 23, a first air pump 24 and a second three-way valve 25. The sample gas at the outlet of the sampling rake 10 flows into the cabinet 20 and passes through the first on-off valve 21 and the first three-way valve 22 in sequence, and then the sample gas is divided into a first branch B1 and a second branch B2. The pressure reducing valve 23 is arranged in the first branch B1, and the first air pump 24 is arranged in the second branch B2. The sample gas passing through the first branch B1 and the second branch B2 is combined and then flows into the second three-way valve 25.

[0072] Preferably, the first branch B1 of the pressure reducing valve 23 is connected with a safety valve 231, which is discharged into the atmosphere. The safety valve 231 is mainly used for discharging the sample gas when the pressure reducing valve 23 is damaged, so as to avoid the damage of the high-pressure sample gas to the downstream analyzer.

[0073] Further, the cabinet 20 further comprises a filter 26. The sample gas flowing out of the second three-way valve 25 flows out of the cabinet 20 through the filter 26.

[0074] The sampling rake 10 is used for sampling the gas at the outlet of the aero-engine or the combustion chamber. The first on-off valve 21 is used for controlling the opening and closing of the gas analysis system. The first on-off valve 21 is opened when the gas analysis test is carried out, and the first on-off valve 21 is closed when the test is finished or a fault occurs in the test. The pressure reducing valve 23 is used for reducing the pressure of the sample gas when the pressure of the sample gas is high, so as to meet the pressure requirement of the analyzer for the sample gas. The first air pump 24 is used for pumping the sample gas when the pressure of the sample gas is low, so as to meet the pressure requirement of the analyzer for the sample gas. The filter 26 is used for filtering the impurities in the sample gas, so as to meet the cleanliness requirement of the analyzer for the sample gas.

[0075] Figure 2 The working principle diagram of the sample gas temperature control device in the sample gas temperature control device for gas analysis test.

[0076] As shown in Figure 2 , the sample gas temperature control device 30 is used to control the temperature of the sample gas at the outlet of the sampling rake 10 to ensure that it meets the regulatory requirements. In this embodiment, the sample gas temperature control device 30 preferably comprises an analog pneumatic regulating valve 31, a first pneumatic on-off valve 32 and a second pneumatic on-off valve 33, wherein the analog pneumatic regulating valve 31 is used to adjust the opening degree according to the temperature of the sample gas at the outlet of the sampling rake 10. The sample gas at the outlet of the sampling rake 10 enters the analog pneumatic regulating valve 31, and then the sample gas is divided into a third branch B3 and a fourth branch B4, the first pneumatic on-off valve 32 is installed in the third branch B3, and the second pneumatic on-off valve 33 is installed in the fourth branch B4. The sample gas passing through the third branch B3 and the fourth branch B4 is discharged into the atmosphere.

[0077] Wherein, the first pneumatic on-off valve 32 and the second pneumatic on-off valve 33 are used to control the flow direction of the sample gas. Generally, when the sample gas pressure at the outlet of the sampling rake is higher than a predetermined pressure (for example, 0.25 MPa), the sample gas flows through the pressure reducing valve 23 (i.e. the first branch B1). When the sample gas pressure at the outlet of the sampling rake is lower than the predetermined pressure (for example, 0.25 MPa), the sample gas flows through the first air suction pump 24 (i.e. the second branch B2).

[0078] Further, the sample gas temperature control device 30 further comprises at least one fifth branch B5 and a second air suction pump 34, the second air suction pump 34 is installed in the fourth branch B4 and located after the second pneumatic on-off valve 33. The second air suction pump 34 is used for air suction. The fifth branch B5 is connected in parallel with the analog pneumatic regulating valve 31, and a third pneumatic on-off valve 35 and a needle valve 36 are installed in each fifth branch B5 in sequence. Wherein, the needle valve 36 is used to adjust the flow.

[0079] In this embodiment, two fifth branches B5 are adopted, and two parallel third pneumatic on-off valves 35 and two parallel needle valves 36 are adopted. Of course, the number of fifth branches B5, i.e. the number of third pneumatic on-off valves 35 and needle valves 36 can be adjusted, and is not limited by the example of this embodiment.

[0080] Further, as shown in Figure 1 , the sample gas flowing out of the cabinet 20 is divided into a sixth branch B6, a seventh branch B7 and an eighth branch B8, the sample gas from the sixth branch B6 passes through the UHC analyzer 50 and is then discharged into the atmosphere, the sample gas from the seventh branch B7 passes through the NO X analyzer 60 and is then discharged into the atmosphere, and the sample gas from the eighth branch B8 passes through a condenser 70 and then enters the CO and CO2 analyzer 80 before being discharged into the atmosphere.

[0081] Wherein, the condenser 70 is used to condense the sample gas to meet the dryness requirement of the CO and CO2 analyzer. The UHC analyzer 50, the NOX The analyzer 60, CO and CO2 analyzer 80 are used to measure the volume concentration of UHC, NOx, CO and CO2 in the sample gas, and finally used to calculate the pollution emission index, combustion efficiency, gas temperature and other performance parameters.

[0082] Preferably, the sample gas in the sixth branch B6 enters the UHC analyzer 50 through the second electrically heated heat preservation pipe 100, and the sample gas in the seventh branch B7 enters the NO X The analyzer 60. Among them, the temperature of the second electrically heated heat preservation pipe 100 is preferably 160℃, and the temperature of the third electrically heated heat preservation pipe 200 is preferably 65℃.

[0083] In addition, the cabinet 20 also preferably includes an electric heater 27 and a second temperature sensor 28. Among them, the electric heater 27 is used to warm the cabinet 20, and the second temperature sensor 28 is used to measure the temperature in the cabinet 20 to ensure that the pipe temperature in the cabinet meets the specification requirements.

[0084] According to the above structural description, the working principle of the sample gas temperature control device for gas analysis test of the present application is as follows: first, open the first switch valve 21, according to the sample gas pressure at the outlet of the sampling rake 10, select the one that flows through the pressure reducing valve 23 or the one that flows through the first air pump 24. That is, the sample gas at the outlet of the sampling rake 10 flows through the first electrically heated heat preservation pipe 11 into the cabinet 20. In the cabinet 20, the sample gas flows through the first switch valve 21 and the first three-way switch valve 22, if the pressure of the sample gas is higher than the preset pressure (for example 0.25MPa), then the sample gas flows through the one that flows through the pressure reducing valve 23, otherwise the sample gas flows through the one that flows through the first air pump 24.

[0085] Then the sample gas passes through the filter 26 and is divided into three branches: one branch is that the sample gas enters the UHC analyzer 50 through the second electrically heated heat preservation pipe 100, another branch is that the sample gas enters the NO X The analyzer 60, and the third branch is that the sample gas enters the CO and CO2 analyzer 80 after passing through the condenser 70. In the test, if the pressure reducing valve 23 is damaged, the safety valve 231 will automatically jump and release the pressure. If the sample gas temperature at the outlet of the sampling rake 10 is low, open the sample gas temperature control device 30 for adjustment.

[0086] In the sample gas temperature control device, the first pneumatic switch valve 32, the second pneumatic switch valve 33 and the third pneumatic switch valve 35 are mainly used to control the opening and closing of the flow path. The analog quantity pneumatic regulating valve 31 adjusts its opening degree according to the parameter of the temperature to be adjusted (the sample gas temperature at the outlet of the sampling rake), adjusts the sample gas flow through the sampling rake 10, so that the sample gas temperature at the outlet of the sampling rake meets the requirements.

[0087] The working principle of the sample gas temperature control device 30 is as follows: based on increasing the sample gas flow through the sampling rake 10, the outlet temperature of the sampling rake 10 is increased to meet the specification requirements.

[0088] The working process of the sample gas temperature control device is as follows:

[0089] If the sample gas pressure at the outlet of the sampling rake 10 is higher than the preset pressure (for example, 0.25 MPa), the first pneumatic on-off valve 32 is opened, and the analog pneumatic regulating valve 31 is opened. According to the sample gas temperature at the outlet of the sampling rake 10 measured by the first temperature sensor 40 and the required temperature of the temperature controller, the analog pneumatic regulating valve 31 is adjusted until the sample gas temperature at the outlet of the sampling rake 10 meets the requirements, and the sample gas is discharged to the atmosphere.

[0090] If the sample gas pressure at the outlet of the sampling rake 10 is lower than the preset pressure (for example, 0.25 MPa), the second pneumatic on-off valve 33 is opened, and the analog pneumatic regulating valve 31 is opened. According to the sample gas temperature at the outlet of the sampling rake 10 measured by the first temperature sensor 40 and the required temperature of the temperature controller, the analog pneumatic regulating valve 31 is adjusted, and the sample flow through the sampling rake 10 is increased by vacuum pumping through the second air pump 34 until the sample gas temperature at the outlet of the sampling rake 10 meets the requirements, and the sample gas is discharged to the atmosphere.

[0091] If the adjustment capacity of the analog pneumatic regulating valve 31 is not enough, any one or both of the two third on-off valves 35 can be optionally opened, and the flow through the sampling rake 10 is adjusted by adjusting the needle valve 36 until the sample gas temperature at the outlet of the sampling rake 10 meets the requirements, and the sample gas is discharged to the atmosphere.

[0092] In summary, the sample gas temperature control device for gas analysis test of the present application is used in cooperation with a gas analysis system, the sample gas flow through the sampling rake is controlled to control the sample gas temperature at the outlet of the sampling rake, and it is ensured that the sample gas temperature at the outlet of the sampling rake meets the specification requirements in the slow speed and sub-slow speed states, the sample gas composition does not condense, and the measurement result is accurate.

[0093] The sample gas temperature control device can ensure that the sample gas at the outlet of the sampling rake does not condense in the slow speed and sub-slow speed states of the aero-engine and its combustion chamber, and the measured pollution emission and combustion efficiency are accurate.

[0094] Although the specific embodiments of the present application are described above, those skilled in the art should understand that these are only illustrative, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A sample gas temperature control device for gas analysis tests, suitable for aircraft engine combustion chambers, characterized in that, The sample gas temperature control device for gas analysis tests includes a sampling rake, a cabinet, a sample gas temperature control device, and a first temperature sensor. The sampling rake is used to sample the gas from the outlet of the aero-engine or combustion chamber. The first temperature sensor is located at the outlet of the sampling rake and is used to measure the sample gas temperature at the outlet of the sampling rake. The cabinet includes a first switching valve, a first three-way valve, a pressure reducing valve, a first suction pump, and a second three-way valve. The sample gas from the sampling rake outlet flows into the cabinet and passes through the first switching valve and the first three-way valve. Then, the sample gas is divided into a first branch and a second branch. The pressure reducing valve is installed in the first branch, and the first suction pump is installed in the second branch. The sample gas from the first branch and the second branch merges and flows into the second three-way valve. The sample gas from the sampling rake outlet flows into the cabinet through the first electric heating and insulation pipe. The sample gas temperature control device is connected to the cabinet. The sample gas temperature control device includes an analog pneumatic regulating valve, a first pneumatic switching valve, and a second pneumatic switching valve. The analog pneumatic regulating valve is used to adjust the opening degree according to the sample gas temperature at the sampling rake outlet. The sample gas from the sampling rake outlet enters the analog pneumatic regulating valve, and then the sample gas is divided into a third branch and a fourth branch. The first pneumatic switch valve is installed in the third branch, and the second pneumatic switch valve is installed in the fourth branch. The sample gas from the third branch and the fourth branch merges and is then discharged into the atmosphere. The sample gas temperature control device also includes at least one fifth branch and a second suction pump, wherein the second suction pump is installed in the fourth branch and is located after the second pneumatic switch valve. The fifth branch is connected in parallel with the analog pneumatic regulating valve, and each of the fifth branches is sequentially equipped with a third pneumatic switching valve and a needle valve. The sample gas temperature control device is used to control the temperature of the sampling rake outlet. When the sample gas temperature at the sampling rake outlet is lower than the predetermined temperature, the sample gas temperature control device is turned on to increase the flow rate through the sampling rake and raise the temperature of the sampling rake outlet. If the sample gas pressure at the sampling rake outlet is higher than the preset pressure, the first pneumatic switch valve is opened, and the analog pneumatic regulating valve is opened at the same time; according to the sample gas temperature at the sampling rake outlet measured by the first temperature sensor and the temperature required by the sample gas temperature control device, the analog pneumatic regulating valve is adjusted until the sample gas temperature at the sampling rake outlet meets the requirements, and the sample gas is discharged to the atmosphere. If the sample gas pressure at the sampling rake outlet is lower than the preset pressure, the second pneumatic switch valve is opened, and the analog pneumatic regulating valve is opened simultaneously. Based on the sample gas temperature at the sampling rake outlet measured by the first temperature sensor and the temperature required by the sample gas temperature control device, the analog pneumatic regulating valve is adjusted, and the sampling volume through the sampling rake is increased by drawing a vacuum using the second vacuum pump until the sample gas temperature at the sampling rake outlet meets the requirements, and the sample gas is discharged to the atmosphere. If the adjustment capacity of the analog pneumatic regulating valve is insufficient, the third pneumatic switch valve is opened, and the flow rate through the sampling rake is adjusted by adjusting the needle valve until the sample gas temperature at the sampling rake outlet meets the requirements, and the sample gas is discharged into the atmosphere.

2. The sample gas temperature control device for gas analysis tests as described in claim 1, characterized in that, The cabinet also includes a filter, through which the sample gas flowing out from the second three-way valve passes before exiting the cabinet.

3. The sample gas temperature control device for gas analysis tests as described in claim 1, characterized in that, The sample gas flowing out of the cabinet is divided into a sixth branch, a seventh branch, and an eighth branch. The sample gas passes through a UHC analyzer via the sixth branch and is then discharged into the atmosphere. The sample gas passes through a NO analyzer via the seventh branch. X The sample gas is discharged into the atmosphere after passing through a condenser via the eighth branch and then enters the CO and CO2 analyzer before being discharged into the atmosphere.

4. The sample gas temperature control device for gas analysis tests as described in claim 3, characterized in that, The sample gas from the sixth branch enters the UHC analyzer through the second electrically heated insulation pipe, and the sample gas from the seventh branch enters the NO analyzer through the third electrically heated insulation pipe. X Analyzer.

5. The sample gas temperature control device for gas analysis tests as described in claim 4, characterized in that, The temperature of the second electric heat tracing and insulation tube is 160°C, and the temperature of the third electric heat tracing and insulation tube is 65°C.

6. The sample gas temperature control device for gas analysis tests as described in claim 1, characterized in that, The cabinet also includes an electric heater and a second temperature sensor. The electric heater is used to heat the cabinet, and the second temperature sensor is used to measure the temperature inside the cabinet.

7. The sample gas temperature control device for gas analysis tests as described in claim 1, characterized in that, The sampling rake outlet is also equipped with a pressure sensor for measuring the sample gas pressure at the sampling rake outlet.

Images