Pressure measurement and sampling device and sampling measurement method

Abstract

The application discloses a pressure measuring and sampling device and a sampling and measuring method, wherein the device comprises: a sampling system for sampling fuel gas; a pretreatment system for mixing the sampled fuel gas to carry out a pollution emission test, or not mixing the sampled fuel gas to carry out a fuel gas analysis temperature test and a total pressure measurement, or controlling a fuel gas direction; and an analysis system for analyzing a pollution emission index, an outlet temperature distribution coefficient (a fuel gas analysis method and a thermocouple method) and a total pressure loss coefficient of the fuel gas of the pretreatment system; the systems are sequentially connected through pipelines, and the sampling system obtains the total pressure loss coefficient, the pollution emission index and the outlet temperature distribution coefficient of the combustion chamber through positive and negative rotation by 180 degrees. The total pressure loss coefficient, the pollution emission index and the outlet temperature distribution coefficient of the combustion chamber can be obtained through one test, that is, only rotating by ±180 degrees, so that the test time is reduced, and the design difficulty of the sampling system is reduced.

Description

Technical Field

[0001] This invention belongs to the field of combustion chamber testing technology for aero-engines and gas turbines, and particularly relates to pressure measurement and sampling devices and sampling measurement methods. Background Technology

[0002] The total pressure loss coefficient, emission index, and outlet temperature distribution coefficient of the combustion chamber are among the most important performance parameters. The total pressure of the combustion chamber is typically measured using a total pressure rake and a pressure scanning valve or pressure sensor. Combustion chamber emissions are measured and calculated using a sampling rake and an analyzer. The combustion chamber gas temperature is measured using a thermocouple rake and a temperature scanning valve, or alternatively, a sampling rake and an analyzer can be used to measure and calculate the combustion chamber gas temperature. In full-annular combustion chamber tests, the temperature rake, total pressure rake, and thermocouple rake are usually mounted on a turntable of a rotary displacement mechanism, typically with four rakes installed on the turntable.

[0003] Currently, there are generally two methods to obtain the total pressure loss coefficient, emission index, and outlet temperature distribution coefficient of the annular combustion chamber. Method one involves installing two types of rakes on the turntable, two of each type. In this method, the turntable rotates ±180°, with a positive sign indicating forward rotation and a negative sign indicating reverse rotation. However, the test needs to be stopped midway to replace the rakes, and then the test must be repeated to obtain the total pressure loss coefficient, emission index, and outlet temperature distribution coefficient, essentially requiring two tests and increasing the testing time. Method two involves installing three types of rakes on the turntable, two of one type and one of each of the other two types. In this method, the rotary displacement mechanism needs to rotate the turntable ±360°, increasing the design complexity of the rotary displacement mechanism. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art in measuring the total pressure loss coefficient of the combustion chamber, the pollution emission index, and the outlet temperature distribution coefficient, which are characterized by long measurement time and difficult design of the rotary displacement mechanism, and to provide a pressure measurement and sampling device and a sampling method including the device.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A pressure measurement and sampling device, comprising:

[0007] A sampling system used to sample natural gas;

[0008] The pretreatment system is used to mix the sampled gas for pollution emission testing, or to conduct gas analysis and temperature measurement tests and total pressure measurements without mixing.

[0009] The analysis system is used to perform pollution emission index analysis, outlet temperature distribution coefficient analysis, and total pressure loss coefficient analysis on the gas from the pretreatment system.

[0010] The sampling system, the pretreatment system, and the analysis system are connected in sequence through pipelines. The sampling system obtains the total pressure loss coefficient of the combustion chamber, the pollution emission index, and the outlet temperature distribution coefficient by rotating 180° positively and negatively.

[0011] In this technical solution, by selecting to mix the gas samples collected from the sampling system for pollution emission measurement tests, or by conducting gas analysis temperature measurement tests and total pressure measurements without mixing, the total pressure loss coefficient, pollution emission index, and outlet temperature distribution coefficient of the combustion chamber can be obtained through a single test, i.e., by rotating only ±180°. Compared with conventional methods, this reduces the test time and lowers the design difficulty of the sampling system.

[0012] Preferably, the sampling system includes: a rotary displacement mechanism, two non-mixed sampling rakes, and two thermocouple rakes. The gas collected by the non-mixed sampling rakes is used to measure the pollution emission pollution index and total pressure loss coefficient. The outlet temperature distribution coefficient is measured by the non-mixed sampling rakes or the thermocouple rakes. The non-mixed sampling rakes and the thermocouple rakes are respectively installed on the rotary displacement mechanism at a 90° interval from each other.

[0013] In this technical solution, by setting up two non-mixed sampling rakes and two thermocouple rakes on the rotary displacement mechanism, the design difficulty of the rotary displacement mechanism is reduced, and the total pressure loss coefficient of the combustion chamber, the pollution emission index and the outlet temperature distribution coefficient can be obtained in one test, thus reducing the test time.

[0014] Preferably, the rotary displacement mechanism completes the pollution emission test, gas analysis and temperature measurement test, thermocouple temperature measurement test and total pressure measurement in sequence by rotating 90° forward, 90° backward, 90° backward and 90° forward.

[0015] In this technical solution, the rotary displacement mechanism only rotates ±180°, which means that through one test, one rotation can collect data to obtain the total pressure loss coefficient of the combustion chamber, the pollution emission index and the outlet temperature distribution coefficient, thus reducing the test time compared with the existing technology.

[0016] Preferably, both the non-mixed sampling rake and the thermocouple rake are provided with a plurality of sampling ports. The sampling system further includes a sampling tube, the sampling ports are connected to the sampling tube, and a pipeline is led out from the sampling tube via a T-junction and connected to the pretreatment system. The gas sampled by the non-mixed sampling rake is used as the first sampling unit, and the gas sampled by the thermocouple rake is used as the second sampling unit.

[0017] In this technical solution, the sampling system leads out pipelines through a three-way connection. One pipeline is used for total pressure measurement, another for gas analysis and temperature measurement (without passing through the mixer), and the third for pollution emission testing (passing through the mixer). Compared with existing technologies, this reduces the hassle of replacing the sampling rake and also lowers the design difficulty of the rotating mechanism.

[0018] Preferably, the pretreatment system includes: a pretreatment unit, an electric heat tracing and insulation pipe, a pretreatment pipeline, an electric heater, and a chassis; the sampling tube is connected to the pretreatment system via the electric heat tracing and insulation pipe; the electric heat tracing and insulation pipe is installed outside the chassis, and the pretreatment pipeline and the electric heater are installed inside the chassis, with the electric heater used to insulate the pretreatment pipeline.

[0019] Preferably, the pretreatment system further includes thermocouple compensating wires, and the pretreatment unit includes a first group of pretreatment units and a second group of pretreatment units. The first group of sampling units is connected to the first group of pretreatment units through the electric heat tracing and insulation pipe and the pretreatment pipeline, and is used to carry out gas analysis temperature measurement tests, pollution emission tests and total pressure measurements. The second group of sampling units is connected to the second group of pretreatment units through the thermocouple compensating wires, and is used to carry out thermocouple temperature measurement tests.

[0020] Preferably, the pretreatment system further includes a mixer and a first set of switching valves, a second set of switching valves, a third set of switching valves, and a fourth set of switching valves. The first set of switching valves is used to control the mixer to mix the gas; the second set of switching valves is used to control the first pretreatment unit to perform total pressure measurement; the third set of switching valves is used to control the second pretreatment unit to perform gas analysis and temperature measurement tests; and the fourth set of switching valves is used to control the first set of switching valves to perform pollution emission tests.

[0021] Preferably, the analysis system includes a pollution emission analysis system, an outlet temperature distribution system, and a pressure analysis system: the pollution emission analysis system includes: a gas composition analysis cabinet, which includes at least pipes, valves, a vacuum pump, pressure / temperature / flow measuring instruments, and an analyzer, for measuring the volume concentration of each component of the fuel gas and calculating at least the pollution emission index and fuel gas temperature parameters; a smoke analysis cabinet, which includes at least pipes, filter paper holders, a vacuum pump, valves, and pressure / temperature / flow measuring instruments, for measuring the smoke count of the fuel gas; the outlet temperature distribution system includes: a temperature scanning valve, for measuring the fuel gas temperature and calculating the combustion chamber outlet temperature distribution coefficient; the pressure analysis system includes: a pressure scanning valve, for measuring the fuel gas pressure and calculating the combustion chamber total pressure loss coefficient.

[0022] Preferably, the analysis system further includes an instrument gas pipeline valve, which is connected to the pretreatment system and is used to control the instrument gas backflush sampling pipeline.

[0023] In this technical solution, the instrument's gas pipeline valve controls backflushing during and before combustion chamber ignition to prevent fuel or other impurities from entering the sampling pipeline if the combustion chamber is not ignited. Backflushing is also required after the test to ensure the cleanliness of the sampling pipeline and guarantee test accuracy.

[0024] The present invention also provides a sampling and measurement method, which employs the pressure measurement and sampling device as described in any of the above claims, and includes the following steps;

[0025] S1. Connect the sampling system, pretreatment system and analysis system in sequence;

[0026] S2. Adjust the inlet temperature, pressure, and flow rate of the full-annular combustion chamber to reach the first test state and maintain stability;

[0027] S3. The gas collected by the sampling system is first subjected to temperature field and total pressure field measurement through the pretreatment system, and then the pollution emission measurement is performed.

[0028] S4. Analyze the gas measured by the pretreatment system through the analysis system, and obtain the outlet temperature distribution coefficient, total pressure loss coefficient and pollution emission index, and complete the measurement of the total pressure field, temperature field and pollution emission of the whole annular combustion chamber under the first test state;

[0029] S5. Continue to adjust the inlet temperature, pressure and flow rate of the annular combustion chamber to reach the second test state and maintain stability. Then repeat S1-S4 to measure the total pressure field, temperature field and pollution emissions at the outlet of the annular combustion chamber until all measurements are completed.

[0030] Preferably, the sampling system includes: a first set of sampling units and a second set of sampling units;

[0031] The sampling system includes: a first set of sampling units and a second set of sampling units;

[0032] The pretreatment system includes: a first set of pretreatment units, the first set of sampling units being connected to the first set of pretreatment units, used for conducting gas analysis and temperature measurement tests, pollution emission tests, and total pressure measurements; a second set of pretreatment units, the second set of sampling units being connected to the second set of pretreatment units, used for conducting thermocouple temperature measurement tests; a mixer; a first set of switching valves, the first set of switching valves being used to control the mixing of gas in the mixer, and the pollution emission test being conducted through the fourth set of switching valves; a second set of switching valves, the second set of switching valves being used to control the first set of pretreatment units to conduct total pressure measurements; and a third set of switching valves, the third set of switching valves being used to control the first set of pretreatment units to conduct gas analysis and temperature measurement tests.

[0033] Preferably, conducting thermocouple temperature measurement and total pressure measurement includes: closing the first set of switching valves and the third set of switching valves, opening the second set of switching valves, and conducting thermocouple temperature measurement and total pressure measurement.

[0034] Preferably, conducting pollution emission measurement and / or gas analysis and temperature measurement tests includes: opening the first set of switching valves and the fourth set of switching valves, closing the second set of switching valves and the third set of switching valves, so that the first set of sampling units enters the mixer for mixing, and conducting pollution emission measurement; and / or closing the first set of switching valves, the second set of switching valves and the fourth set of switching valves, opening the third set of switching valves, and conducting gas analysis and temperature measurement tests.

[0035] The positive and progressive effects of this invention are as follows: by installing two non-mixed sampling rakes and two thermocouple rakes on the rotary displacement mechanism, the total pressure loss coefficient of the combustion chamber, the pollution emission index and the outlet temperature distribution coefficient can be obtained through a single test with the rotary displacement mechanism rotating only ±180°. Compared with conventional methods, this reduces the test time and lowers the design difficulty of the rotary displacement mechanism. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the arrangement of the pressure measurement and sampling device in Embodiment 1 of the present invention;

[0037] Figure 2 This is a flowchart of the sampling and measurement method in Embodiment 2 of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] Electric heat tracing insulation pipe 1-10

[0040] First set of switching valves 11-20

[0041] Second set of switching valves 21-30

[0042] Third set of switch valves 31-40

[0043] Fourth group of switching valves 41-42

[0044] Instrument gas pipeline valve 43

[0045] Mixer 44

[0046] Gas composition analysis cabinet 45-49

[0047] Smoke Analysis Cabinet 50

[0048] Chassis 51

[0049] Electric heater 52 Detailed Implementation

[0050] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0051] Example 1

[0052] like Figure 1 As shown, a pressure measuring and sampling device includes:

[0053] A sampling system used to sample natural gas;

[0054] The pretreatment system is used to mix the sampled gas for pollution emission testing, or to conduct gas analysis and temperature measurement tests and total pressure measurements without mixing.

[0055] The analysis system is used to perform pollution emission index analysis, outlet temperature distribution coefficient analysis, and total pressure loss coefficient analysis on the gas from the pretreatment system.

[0056] The sampling system, the pretreatment system, and the analysis system are connected in sequence through pipelines. The sampling system obtains the total pressure loss coefficient of the combustion chamber, the pollution emission index, and the outlet temperature distribution coefficient by rotating 180° positively and negatively.

[0057] By selecting to mix the gas samples collected from the sampling system for pollution emission measurement tests, or to conduct gas analysis temperature measurement tests and total pressure measurements without mixing, the total pressure loss coefficient, pollution emission index, and outlet temperature distribution coefficient of the combustion chamber can be obtained through a single test, i.e., by rotating ±180° only. Compared with conventional methods, this reduces test time and lowers the design difficulty of the sampling system.

[0058] The sampling system includes: a rotary displacement mechanism, two non-mixed sampling rakes, and two thermocouple rakes. The gas collected by the non-mixed sampling rakes is used to measure the pollution emission pollution index and total pressure loss coefficient. The outlet temperature distribution coefficient is measured by the non-mixed sampling rakes or the thermocouple rakes. The non-mixed sampling rakes and the thermocouple rakes are installed on the rotary displacement mechanism at a 90° interval from each other.

[0059] That is to say, the two non-mixed sampling rakes are spaced 180° apart, and the two thermocouple rakes are spaced 180° apart.

[0060] The rotary displacement mechanism completes the pollution emission test, gas analysis and temperature measurement test, and total pressure measurement in sequence by rotating 90° forward, 90° backward, 90° backward, and 90° forward.

[0061] In this embodiment, the two non-mixed sampling rakes have a total of 10 sampling ports. The sampling system also includes a sampling tube, and the sampling ports are connected to the sampling tube. A pipeline is led out of the sampling tube through a T-junction and connected to the pretreatment system. The gas sampled by the non-mixed sampling rake is used as the first sampling unit, and the gas sampled by the thermocouple rake is used as the second sampling unit.

[0062] The pretreatment system includes: a pretreatment unit, an electric heat tracing and insulation pipe 1-10, a thermocouple compensating wire (not shown in the figure), an electric heater 52, and a chassis 51; the sampling pipe is connected to the pretreatment system through the electric heat tracing and insulation pipe 1-10; the electric heat tracing and insulation pipe is installed outside the chassis 51, and the pretreatment pipe and the electric heater 52 are installed inside the chassis 51. The electric heater 52 is used to insulate the pretreatment pipe at 160℃.

[0063] The pretreatment unit includes a first pretreatment unit and a second pretreatment unit. The first sampling unit is connected to the first pretreatment unit via an electrically heated insulation pipe 1-10 and is used for conducting gas analysis temperature measurement tests, pollution emission measurements, and total pressure measurements. The second sampling unit is connected to the second pretreatment unit via thermocouple compensating wires and is used for conducting thermocouple temperature measurement tests. Specifically, the second sampling unit is connected to the temperature scanning valve in the analysis system (not shown in the figure) via thermocouple compensating wires to measure the gas temperature. It should be noted that the thermocouple temperature measurement tests do not require mixing.

[0064] The pretreatment system also includes a mixer 44 and a first set of switching valves 11-20, a second set of switching valves 21-30, a third set of switching valves 31-40, and a fourth set of switching valves 41-42. The first set of switching valves 11-20 is used to control the mixing of gas in the mixer 44, and the fourth set of switching valves 41-42 is used to conduct pollution emission tests. The second set of switching valves 21-30 is used to control the first set of pretreatment units to conduct total pressure measurements, and the third set of switching valves 31-40 is used to control the second set of pretreatment units to conduct gas analysis and temperature measurement tests.

[0065] The analysis system includes: a pollution emission analysis system, an outlet temperature distribution system, and a pressure analysis system. The pollution emission analysis system includes: gas composition analysis cabinets 45-49, which include pipes, valves, a vacuum pump, pressure / temperature / flow measuring instruments, and an analyzer, used to measure the volume concentration of various components in the fuel gas. Through calculation, pollution emission indices and fuel gas temperature parameters can be obtained. The smoke analysis cabinet 50 includes pipes, filter paper holders, a vacuum pump, valves, and pressure / temperature / flow measuring instruments, used to measure the smoke emission of the fuel gas.

[0066] The outlet temperature distribution system includes a temperature scanning valve (not shown) used to analyze the outlet temperature distribution of the entire annular combustion chamber and to calculate the outlet temperature distribution coefficient of the combustion chamber.

[0067] The pressure analysis system includes a pressure scanning valve for measuring gas pressure and calculating the total pressure loss coefficient of the combustion chamber.

[0068] The instrument gas line valve 43, connected to the outside of the housing 51, is used to control the backflushing of the sampling line. Specifically, the instrument gas line valve 43 controls backflushing during and before combustion chamber ignition to prevent fuel or other impurities from entering the sampling line if the combustion chamber is not ignited. Backflushing is also required after the test to ensure the cleanliness of the sampling line and guarantee test accuracy.

[0069] Example 2

[0070] like Figure 2 As shown, this embodiment provides a sampling and measurement method, employing a pressure measurement and sampling device as described in Embodiment 1, including the following steps:

[0071] S1. Connect the sampling system, pretreatment system and analysis system in sequence;

[0072] S2. Adjust the inlet temperature, pressure, and flow rate of the full-annular combustion chamber to reach the first test state and maintain stability;

[0073] S3. The gas collected by the sampling system is first subjected to temperature field and total pressure field measurement through the pretreatment system, and then the pollution emission measurement is performed.

[0074] S4. Analyze the gas measured by the pretreatment system through the analysis system, and obtain the outlet temperature distribution coefficient, total pressure loss coefficient and pollution emission index, and complete the measurement of the total pressure field, temperature field and pollution emission of the whole annular combustion chamber under the first test state;

[0075] S5. Continue to adjust the inlet temperature, pressure and flow rate of the annular combustion chamber to reach the second test state and maintain stability. Then repeat S1-S4 to measure the total pressure field, temperature field and pollution emissions at the outlet of the annular combustion chamber until all measurements are completed.

[0076] The sampling system includes: a first set of sampling units and a second set of sampling units.

[0077] The pretreatment system includes: a first pretreatment unit and a second pretreatment unit; the first pretreatment unit, with the first sampling unit connected to the first pretreatment unit, is used to conduct gas analysis temperature measurement tests, pollution emission tests and total pressure measurements; the second pretreatment unit, with the second sampling unit connected to the second pretreatment unit, is used to conduct thermocouple temperature measurement tests.

[0078] The pretreatment system also includes a mixer 44 and a first set of switching valves 11-20, a second set of switching valves 21-30, a third set of switching valves 31-40, and a fourth set of switching valves 41-42. The first set of switching valves 11-20 is used to control the mixing of gas in the mixer 44, and the fourth set of switching valves 41-42 is used to conduct pollution emission tests. The second set of switching valves 21-30 is used to control the first set of pretreatment units to conduct total pressure measurements. The third set of switching valves 31-42 is used to control the first set of pretreatment units to conduct gas analysis and temperature measurement tests.

[0079] The thermocouple temperature measurement test and total pressure measurement include: closing the first set of switching valves 11-20 and the third set of switching valves 31-43, and opening the second set of switching valves 21-30, allowing the first set of pretreatment units to perform total pressure measurement according to the first set of sampling units. The sample gas from the outlets of the two sampling rakes flows through the electrically heated insulation pipe 1-10 and the second set of switching valves 21-30, entering the pressure scanning valve to measure the total pressure. At this time, the rotation angle of the rotary displacement mechanism is determined according to the required measurement point density. The rotary displacement mechanism first rotates 90° clockwise using a "rotate-stop-rotate" method, then rotates continuously and rotates 90° counterclockwise to return to the correct position, and then repeats the "rotate-stop-rotate" method again, first rotating 90° counterclockwise, then rotating continuously and rotating 90° clockwise to return to the correct position, thus completing the entire thermocouple temperature measurement test and total pressure measurement. It should be noted that the thermocouple temperature measurement test is applicable when the outlet temperature of the entire annular combustion chamber is below 1800℃.

[0080] The pollution emission measurement process includes: opening the first set of switching valves 11-20 and the fourth set of switching valves 41-42, and closing the second set of switching valves 21-30 and the third set of switching valves 31-40, allowing the second sampling unit to enter the mixer 44 for mixing and pollution emission measurement. The sample gas from the outlets of the two sampling rakes passes through the electrically heated insulation pipe 1-10 and the first set of switching valves 11-20 before entering the mixer 44 for mixing. The mixed sample gas then passes through switching valve 42 and enters the gas composition analysis cabinet 45 for gaseous pollutant measurement. The mixed sample gas then passes through switching valve 41 and enters the smoke analysis cabinet 50 for smoke measurement. This completes the measurement of the total pressure field, temperature field, and pollution emissions of the entire annular combustion chamber under the first experimental condition. The total pressure loss coefficient, outlet temperature distribution coefficient, and pollution emission index of the combustion chamber can be calculated.

[0081] When measuring the temperature field and total pressure field, the rotary displacement mechanism measures using a "rotate-stop-rotate" method. However, when measuring pollution emissions, the rotary displacement mechanism rotates continuously, and the measurement can be completed in just a few minutes. Therefore, it takes less time compared to the temperature field and total pressure field measurements.

[0082] It is important to emphasize that when the outlet temperature of the annular combustion chamber exceeds 1800℃, a fuel gas analysis method must be used to measure the fuel gas temperature. Furthermore, the thermocouple rakes on the rotary displacement mechanism must be replaced with non-mixed sampling rakes. This means that the rotary displacement mechanism will have four non-mixed sampling rakes at this time. The rotation angle of the rotary displacement mechanism is ±90°, and each sampling rake has five sampling holes. Two sampling rakes correspond to ten sampling tubes. The working principle is as follows:

[0083] First, close the first set of switch valves 11-20, the second set of switch valves 21-30, the third set of switch valves 31-40, the fourth set of switch valves 41-42, and the instrument gas pipeline valve 43. Then, open switch valve 21-25. The sample gas from the outlet of the first sampling rake enters the gas composition analysis cabinet 45-49 after passing through the electric heating insulation pipe 1-5 and switch valve 21-25 for gaseous composition measurement. The temperature at the location of the first sampling rake can be calculated. Then, open switch valve 36-40 and close switch valve 31-35. The sample gas from the outlet of the second sampling rake enters the gas composition analysis cabinet 45-49 after passing through the electric heating insulation pipe 6-10 and switch valve 36-40 for gaseous composition measurement. The temperature at the location of the second sampling rake can be calculated. At this point, the temperature at 10 points at the current location of the two sampling rakes has been measured. Continue rotating the displacement mechanism to the second position as required, and measure the temperature at the second location of the two sampling rakes using the same method to obtain the temperature at that location. The temperatures at the remaining locations are measured sequentially using the same method.

[0084] For gas analysis temperature measurement, the thermocouple rake can be replaced with a non-mixed sampling rake. If not replaced, the rotation angle of the rotary displacement mechanism is ±180°. Pollution emission measurement, total pressure measurement, thermocouple temperature measurement, and gas analysis temperature measurement can also be carried out in a single test, which increases the test time compared to the replacement method.

[0085] In summary, by installing two non-mixed sampling rakes and two thermocouple rakes on the rotary displacement mechanism in the sampling and measurement device, the total pressure loss coefficient of the combustion chamber, the pollution emission index, and the outlet temperature distribution coefficient can be obtained through a single test with the rotary displacement mechanism rotating only ±180°. Compared with conventional methods, this reduces the test time and lowers the design difficulty of the rotary displacement mechanism.

[0086] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention 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 invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A pressure measuring and sampling device, characterized in that, include: A sampling system used to sample natural gas; The pretreatment system is used to mix the sampled gas for pollution emission testing, or to conduct gas analysis and temperature measurement tests and total pressure measurements without mixing. The analysis system is used to perform pollution emission index analysis, outlet temperature distribution coefficient analysis, and total pressure loss coefficient analysis on the gas from the pretreatment system. The sampling system, the pretreatment system, and the analysis system are connected in sequence via pipelines. The sampling system obtains the total pressure loss coefficient of the combustion chamber, the pollution emission index, and the outlet temperature distribution coefficient by rotating the sampling system 180° positively and negatively. The sampling system includes a rotary displacement mechanism, two non-mixed sampling rakes, and two thermocouple rakes. The gas collected by the non-mixed sampling rakes is used to measure the pollution emission index and total pressure loss coefficient. The outlet temperature distribution coefficient is measured by the non-mixed sampling rakes or the thermocouple rakes. The non-mixed sampling rakes and the thermocouple rakes are installed on the rotary displacement mechanism at a 90° interval from each other.

2. The pressure measurement and sampling device as described in claim 1, characterized in that, The rotary displacement mechanism completes the pollution emission test, gas analysis and temperature measurement test, thermocouple temperature measurement test and total pressure measurement in sequence by rotating 90° forward, 90° backward, 90° backward and 90° forward.

3. The pressure measurement and sampling device as described in claim 1, characterized in that, Both the non-mixed sampling rake and the thermocouple rake are provided with several sampling ports. The sampling system also includes a sampling tube, and the sampling ports are connected to the sampling tube. A pipeline is led out from the sampling tube through a three-way connector and connected to the pretreatment system. The gas sampled by the non-mixed sampling rake is used as the first sampling unit, and the gas sampled by the thermocouple rake is used as the second sampling unit.

4. The pressure measurement and sampling device as described in claim 3, characterized in that, The pretreatment system includes: a pretreatment unit, an electric heat tracing and insulation pipe, a pretreatment pipeline, an electric heater, and a chassis; the sampling tube is connected to the pretreatment system via the electric heat tracing and insulation pipe; the electric heat tracing and insulation pipe is installed outside the chassis, and the pretreatment pipeline and the electric heater are installed inside the chassis, with the electric heater used to insulate the pretreatment pipeline.

5. The pressure measurement and sampling device as described in claim 4, characterized in that, The pretreatment system also includes thermocouple compensating wires. The pretreatment unit includes a first group of pretreatment units and a second group of pretreatment units. The first group of sampling units is connected to the first group of pretreatment units through the electric heat tracing and insulation pipe and the pretreatment pipeline, and is used to carry out gas analysis and temperature measurement tests, pollution emission tests and total pressure measurements. The second group of sampling units is connected to the second group of pretreatment units through the thermocouple compensating wires, and is used to carry out thermocouple temperature measurement tests.

6. The pressure measurement and sampling device as described in claim 4, characterized in that, The pretreatment system also includes a mixer and a first set of switching valves, a second set of switching valves, a third set of switching valves, and a fourth set of switching valves. The first set of switching valves is used to control the mixing of gas in the mixer, and the fourth set of switching valves is used to conduct pollution emission tests. The second set of switching valves is used to control the first pretreatment unit to conduct total pressure measurements, and the third set of switching valves is used to control the second pretreatment unit to conduct gas analysis and temperature measurement tests.

7. The pressure measuring and sampling device as described in any one of claims 1-6, characterized in that, The analysis system includes a pollution emission analysis system, an outlet temperature distribution system, and a pressure analysis system. The pollution emission analysis system includes: a gas composition analysis cabinet, which includes at least pipes, valves, a vacuum pump, pressure / temperature / flow measuring instruments, and an analyzer, for measuring the volume concentration of each component of the gas and calculating at least the pollution emission index and gas temperature parameters; and a smoke analysis cabinet, which includes at least pipes, filter paper holders, a vacuum pump, valves, and pressure / temperature / flow measuring instruments, for measuring the smoke count of the gas. The outlet temperature distribution system includes: a temperature scanning valve for measuring the gas temperature and calculating the combustion chamber outlet temperature distribution coefficient; The pressure analysis system includes a pressure scanning valve for measuring gas pressure and calculating the total pressure loss coefficient of the combustion chamber.

8. The pressure measurement and sampling device as described in claim 7, characterized in that, The analysis system also includes an instrument gas pipeline valve, which is connected to the pretreatment system and is used to control the instrument gas backflush sampling pipeline.

9. A sampling and measurement method, characterized in that, The pressure measurement and sampling device as described in any one of claims 1-8 includes the following steps; S1. Connect the sampling system, pretreatment system and analysis system in sequence; S2. Adjust the inlet temperature, pressure, and flow rate of the full-annular combustion chamber to reach the first test state and maintain stability; S3. The gas collected by the sampling system is first subjected to temperature field and total pressure field measurement through the pretreatment system, and then the pollution emission measurement is performed. S4. Analyze the gas measured by the pretreatment system through the analysis system and obtain the outlet temperature distribution coefficient, total pressure loss coefficient, and pollution emission index to complete the measurement of the total pressure field, temperature field, and pollution emissions of the entire annular combustion chamber under the first test condition. S5. Continue to adjust the inlet temperature, pressure and flow rate of the annular combustion chamber to reach the second test state and maintain stability. Then repeat S1-S4 to measure the total pressure field, temperature field and pollution emissions at the outlet of the annular combustion chamber until all measurements are completed.

10. The sampling and measurement method as described in claim 9, characterized in that, The sampling system includes: a first set of sampling units and a second set of sampling units; The pretreatment system includes: a first set of pretreatment units, the first set of sampling units being connected to the first set of pretreatment units, used for conducting gas analysis and temperature measurement tests, pollution emission tests, and total pressure measurements; a second set of pretreatment units, the second set of sampling units being connected to the second set of pretreatment units, used for conducting thermocouple temperature measurement tests; a mixer; a first set of switching valves, the first set of switching valves being used to control the mixing of gas in the mixer; a second set of switching valves, the second set of switching valves being used to control the first set of pretreatment units to conduct total pressure measurements; a third set of switching valves, the third set of switching valves being used to control the first set of pretreatment units to conduct gas analysis and temperature measurement tests; and a fourth set of switching valves, used to control the first set of switching valves to conduct pollution emission tests.

11. The sampling and measurement method as described in claim 10, characterized in that, Conducting thermocouple temperature measurement and total pressure measurement includes: closing the first set of switching valves and the third set of switching valves, opening the second set of switching valves, and conducting thermocouple temperature measurement and total pressure measurement.

12. The sampling and measurement method as described in claim 10, characterized in that, Conducting pollution emission measurement and / or gas analysis and temperature measurement tests includes: opening the first set of switch valves and the fourth set of switch valves, closing the second set of switch valves and the third set of switch valves, so that the first set of sampling units enters the mixer for mixing, and conducting pollution emission measurement; and / or closing the first set of switch valves, the second set of switch valves and the fourth set of switch valves, opening the third set of switch valves, and conducting gas analysis and temperature measurement tests.

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