Electro-pneumatic expander test apparatus and test method

Abstract

The present application relates to the technical field of expander test equipment, and relates to an electro-pneumatic expander test apparatus and a test method. The expander test apparatus comprises an expander test bench, a drive motor, a gas supply pipeline, and an exhaust pipeline. The expander test bench is used to mount an expander to be tested. The drive motor is disposed on one side of the expander test bench, and the drive motor is connected to a rotating shaft of an impeller inside the expander. An air compressor, a gas storage tank, a heater, and a regulating valve are sequentially arranged in the gas supply pipeline. The air compressor is in communication with an inlet of the gas storage tank. An outlet of the gas storage tank is in communication with an inlet of the heater. An outlet of the heater is in communication with an inlet of the regulating valve. An outlet of the regulating valve is in communication with an inlet of the expander. The exhaust pipeline is in communication with an exhaust port of the expander, and a temperature sensor is disposed in the exhaust pipeline. The present application achieves mechanical performance testing of large-scale expanders under normal operating conditions, and improves characteristic testing efficiency and testing accuracy.

Description

Electrical linkage expander test device and test method TECHNICAL FIELD

[0001] The present application relates to the technical field of expander test equipment, in particular to an electrical linkage expander test device and test method. BACKGROUND

[0002] Large energy recovery turbine expander is a special mechanical equipment for petrochemical industry. On the basis of conventional axial flow turbocharger expander, the large energy recovery turbine expander replaces turbocharging with expander driving generator mode, converts expansion work into electric energy feedback to the power grid, thereby realizing energy recovery. Energy recovery turbine expander solves the demand of petrochemical enterprises to utilize high-temperature and high-pressure tail gas waste, and provides a green and efficient solution for tail gas treatment.

[0003] In order to ensure that such large energy recovery expander can operate stably for a long time with high efficiency in actual industrial environment, mechanical operation test is of great significance. Mechanical operation test can evaluate the performance of the equipment in long-term operation, optimize the operation parameters of the equipment, improve the energy utilization efficiency, and reduce the operation cost, thereby promoting sustainable development.

[0004] The gas flow and pressure required by the large expander during mechanical operation test are relatively large, and the expander test bench has the disadvantages of large investment and large floor area. The existing test bench has small flow and insufficient pressure, and it is difficult to achieve the required pressure and flow for large expander test. When using motor to drive expander to run for test, the reverse work of expander increases the internal temperature, causing thermal expansion and cold contraction of internal parts of expander, affecting the performance of expander, and also unable to accurately test the mechanical characteristics of expander. Therefore, an electrical linkage mechanical operation test method and device are proposed. SUMMARY

[0005] In order to solve the problems in the prior art that the existing test device has small flow and insufficient pressure, and it is difficult to achieve the required pressure and flow for expander test, and when using motor to drive expander to run for test, the reverse work of expander increases the internal temperature, causing thermal expansion and cold contraction of internal parts of expander, affecting the performance of expander, and also unable to accurately test the mechanical characteristics of expander, the present application provides an electrical linkage expander test device and test method.

[0006] The electrical linkage expander test device and test method provided by the present application adopt the following technical solutions:

[0007] The utility model provides an electric linkage expander test device, including expander test station, drive motor, gas supply pipeline and exhaust pipe, the expander test station is used for installing the expander of waiting to test, drive motor sets up one side on expander test station, drive motor connects the rotation axis of expander internal impeller, gas supply pipeline is provided with air compressor, gas holder, heater and regulating valve in proper order, air compressor communicates gas holder import, gas holder export communicates heater import, heater export communicates regulating valve import, regulating valve export communicates expander import, exhaust pipe communicates expander exhaust, be provided with temperature sensor in exhaust pipe.

[0008] Through adopting above technical scheme, when testing the expander, first, install the expander on the expander test station, connect the gas inlet of the expander with the gas supply pipeline, connect the gas outlet of the expander with the exhaust pipe, then open the valves in the gas supply pipeline and the exhaust pipe, the air compressor compresses the air and stores it in the gas holder, after the valve is opened, the compressed air is heated to the set temperature by the heater and then enters the expander, the high-temperature and high-pressure gas expands in the expander to drive the impeller to rotate, then start the drive motor, the drive motor assists the rotation of the impeller to make the impeller rotate to the set speed, the regulating valve is used to adjust the gas flow in the gas supply pipeline, and the temperature sensor is used to measure the outlet gas temperature of the expander.

[0009] Optionally, a filter is arranged at the gas holder outlet in the gas supply pipeline.

[0010] Through adopting the above technical scheme, the filter is used to filter the air to prevent impurities in the air from entering the expander and affecting the testing accuracy of the expander.

[0011] Optionally, a heat exchanger is further included, which is connected with the gas supply pipeline and the exhaust pipe respectively.

[0012] Through adopting the above technical scheme, the high-temperature gas discharged from the expander outlet enters the heat exchanger, the high-pressure gas in the gas supply pipeline enters the heat exchanger and exchanges heat with the high-temperature gas in the exhaust pipe, thereby cooling the gas in the exhaust pipe and preheating the high-pressure gas in the gas supply pipeline, which realizes the recycling of heat and saves energy.

[0013] Optionally, a cold dryer and a gas-liquid separator are arranged between the heat exchanger and the heater in the gas supply pipeline, the inlet of the cold dryer is connected with the outlet of the heat exchanger, the outlet of the cold dryer is connected with the inlet of the gas-liquid separator, and the outlet of the gas-liquid separator is connected with the inlet of the heater.

[0014] By adopting the technical scheme, the gas drying machine dries the gas in the gas supply pipeline, condenses the liquid in the gas by cooling, and then separates the condensed liquid to realize drying, and the gas-liquid separator is used to further remove the liquid contained in the high-pressure gas to improve the drying degree of the gas.

[0015] Optionally, the mechanical property detection device is further connected to the expander and used to detect the mechanical property of the expander.

[0016] By adopting the technical scheme, the mechanical property detection device includes a temperature sensor, a vibration sensor, and a torque sensor, which are used to test the mechanical property of the expander.

[0017] An electrical linkage expander test method, the steps comprising:

[0018] The expander is connected to the gas supply pipeline, the exhaust pipeline, and the driving motor.

[0019] The valves in the gas supply pipeline and the exhaust pipeline are opened to drive the expander to operate.

[0020] The driving motor is started to drive the impeller in the expander to rotate to a set rotating speed.

[0021] The gas flow in the gas supply pipeline is adjusted to keep the rotating speed of the impeller constant.

[0022] The operating parameters of the expander under different gas flows are measured.

[0023] The operating parameters of the expander under different gas flows are compared and analyzed to select the best test working condition.

[0024] The expander is continuously driven to operate under the best test working condition and the mechanical property is detected.

[0025] Optionally, the step of connecting the expander to the gas supply pipeline, the exhaust pipeline, and the driving motor comprises: the gas inlet of the expander is communicated with the gas supply pipeline, the exhaust outlet of the expander is communicated with the exhaust pipeline, and the driving motor is connected to the rotating shaft of the impeller in the expander through a shaft coupling.

[0026] By adopting the technical scheme, the gas supply pipeline delivers high-temperature and high-pressure gas to the expander, the high-temperature and high-pressure gas drives the impeller in the expander to rotate and work, and then the expanded and cooled gas is discharged through the exhaust pipeline, and the driving motor assists the rotation of the impeller to make the impeller reach the required rotating speed for testing.

[0027] Optionally, the step of adjusting the gas flow in the gas supply pipeline to keep the rotating speed of the impeller constant comprises: an adjusting valve is arranged in the gas supply pipeline, and the gas flow in the gas supply pipeline is adjusted by controlling the opening of the valve core in the adjusting valve.

[0028] By adopting the above technical solution, the regulating valve controls the air intake flow and velocity of the expander, and the opening of the regulating valve is gradually adjusted to test the expander, thereby accurately obtaining the optimal operating conditions of the expander.

[0029] Optionally, the steps for measuring the operating parameters of the expander under different gas flow rates include: setting different opening degrees of the regulating valve, driving the expansion to run continuously for a set time under different opening degrees of the regulating valve, and measuring the gas temperature at the outlet of the expander.

[0030] By adopting the above technical solution, the expander is driven to run for a certain period of time at different opening degrees of the regulating valve. During the operation, the outlet gas temperature of the expander is continuously measured to obtain the average outlet gas temperature of the expander at the opening degree of the regulating valve.

[0031] Optionally, the step of comparing and analyzing the expander operating parameters under different gas flow rates to select the optimal test condition includes: comparing the outlet gas temperature of the expander under different opening degrees of the regulating valve, and selecting the operating condition with the lowest outlet gas temperature as the optimal test condition.

[0032] By adopting the above technical solution, the average outlet gas temperature of the expander under different opening degrees of the regulating valve is compared, and the lowest outlet gas temperature is selected as the optimal operating condition.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. In this application, the expansion machine is driven synchronously by a motor and high-pressure gas, which simulates the working conditions of a large expansion machine in normal operation, realizes the mechanical performance test of the large expansion machine under normal operating conditions, and improves the efficiency and accuracy of characteristic testing;

[0035] 2. In this application, the outlet gas temperature of the expander is measured at different opening degrees by controlling the opening degree of the regulating valve, thereby realizing the rapid adjustment of the optimal operating conditions of the expander, ensuring that the expander is tested under the optimal operating conditions, and improving the accuracy of the test.

[0036] 3. In this application, a heat exchanger is set up to connect the gas supply pipeline and the exhaust pipeline. The high-temperature gas discharged from the expander outlet enters the heat exchanger. After the high-pressure gas in the gas supply pipeline enters the heat exchanger, it exchanges heat with the high-temperature gas in the exhaust pipeline. While cooling the gas in the exhaust pipeline, it preheats the high-pressure gas in the gas supply pipeline, realizing the recovery and utilization of heat and saving energy. Attached Figure Description

[0037] Figure 1 is a schematic diagram of the composition of an electrically linked expander test device in an embodiment of this application.

[0038] Fig. 2 is a flow chart of a test method of an electrically linked expander according to an embodiment of the present application.

[0039] Reference signs: 1, expander test station; 2, driving motor; 3, mechanical property detection device; 4, gas supply pipeline; 41, regulating valve; 42, gas-liquid separator; 43, cold dryer; 44, filter; 45, gas storage tank; 46, air compressor; 47, heater; 5, exhaust pipeline; 51, temperature sensor; 6, heat exchanger; 7, PLC control cabinet. DETAILED DESCRIPTION

[0040] The advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the present specification.

[0041] Please refer to Figs. 1-2. It should be understood that the structures, proportions, sizes, etc. shown in the drawings attached to the present specification are only used to cooperate with the content disclosed in the present specification for understanding and reading by those skilled in the art, and are not used to limit the defined conditions that can be implemented by the present application, and therefore do not have technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that can be produced by the present application and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are only for the purpose of clear understanding of the description, and are not used to limit the scope of the present application that can be implemented, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application that can be implemented.

[0042] The present application will be further described in detail below in combination with Figs. 1-2.

[0043] Referring to Figure 1, an electrically linked expander test device, comprising an expander test station 1, a support for installing an expander is arranged in the expander test station 1, a driving motor 2 is arranged on one side of the expander test station 1, a PLC control cabinet 7 for controlling the driving motor 2 is arranged on one side of the driving motor 2, a mechanical property detection device 3 for testing the mechanical properties of the expander is arranged in the expander test station 1, the mechanical property detection device includes but is not limited to a temperature sensor for measuring the temperature of the impeller inside the expander during operation, a vibration sensor for monitoring the vibration frequency of the impeller inside the expander during operation, and a torque sensor for monitoring the torque of the impeller, a gas supply pipeline 4 and an exhaust pipeline 5 are arranged on both sides of the expander test station 1 respectively, the gas supply pipeline 4 includes an air compressor 46, a gas tank 45, a filter 44, a cold dryer 43, a gas-liquid separator 42, and two groups of heaters 47, the outlet of the air compressor 46 is connected to the inlet of the gas tank 45 through a pipeline, the outlet of the gas tank 45 is connected to the inlet of the filter 44 through a pipeline, the outlet of the filter 44 is connected to the gas-liquid separator 42 through a pipeline, the filter 44 and the gas-liquid separator 42 are connected in parallel with the cold dryer 43, the two groups of heaters 47 are arranged in parallel and heat the gas synchronously and then mix the heated gas to improve the heating temperature and heating rate of the gas, the outlets of the two groups of heaters 47 are connected to the inlet of the expander through a pipeline, an adjusting valve 41 is arranged in the inlet pipeline of the expander, the adjusting valve 41 is used to control the flow and flow rate of the gas entering the interior of the expander, a temperature sensor 51 is arranged in the exhaust pipeline 5, the exhaust pipeline 5 is connected to the outlet of the expander, a heat exchanger 6 is arranged between the filter 44 and the gas-liquid separator 42 in the gas supply pipeline 4 and is connected in parallel with the cold dryer 43, one pipeline in the heat exchanger 6 is connected to the exhaust pipeline 5, and the other pipeline in the heat exchanger 6 is connected to the gas supply pipeline 4.

[0044] The operation principle of an electrically linked expander test device is as follows:

[0045] When testing the expander, the expander is fixedly installed on the expander test station 1, the gas supply pipeline 4 is connected to the inlet of the expander, the exhaust pipeline 5 is connected to the outlet of the expander, the air compressor 46 continuously operates to compress external gas and deliver the external gas to the gas storage tank 45 for storage, the gas storage tank 45 stably delivers high-pressure gas to the outside to ensure that the pressure of the gas in the gas supply pipeline 4 is constant, the filter 44 filters the high-pressure gas to remove impurities in the gas, the filtered high-pressure gas enters the heat exchanger 6, exchanges heat with the gas discharged from the exhaust pipeline 5 in the heat exchanger 6, cools the discharged gas, and preheats the gas in the gas supply pipeline 4, the preheated high-pressure gas enters the gas-liquid separator 42, the gas-liquid separator 42 removes water in the high-pressure gas, the dried high-pressure gas enters the heater 47, the heater 47 heats the high-pressure gas to a set temperature to form high-temperature and high-pressure gas, the high-temperature and high-pressure gas enters the inside of the expander, expands and cools in the inside of the expander to work on the impeller and drive the impeller to rotate, in the process of rotating the impeller, the driving motor is started synchronously, the driving motor cooperates with the high-temperature and high-pressure gas to synchronously drive the impeller to rotate, so that the impeller reaches a set rotating speed, and then the mechanical properties of the expander are tested at the set rotating speed.

[0046] Referring to FIG. 2, a test method based on the above-mentioned electrically linked expander test device, the steps include:

[0047] 101, connecting the expander to the gas supply pipeline, the exhaust pipeline and the driving motor

[0048] Specifically, the expander is fixedly installed on the expander test station 1, the gas supply pipeline 4 is connected to the inlet of the expander, the exhaust pipeline 5 is connected to the outlet of the expander, and the driving motor 2 is connected to the rotating shaft of the impeller in the expander through a shaft coupling;

[0049] 102, opening the valves in the gas supply pipeline and the exhaust pipeline to drive the expander to operate

[0050] Specifically, open the valve in the gas supply pipeline 4 and the exhaust pipeline 5, so that the gas supply pipeline 4 and the exhaust pipeline 5 are communicated with the expander, set the pressure of the air compressor 46, the air compressor 46 continuously runs to compress and deliver the external gas to the gas storage tank 45 for storage, the gas storage tank 45 stably delivers the high-pressure gas to the outside to ensure the constant pressure of the gas in the gas supply pipeline 4, the filter 44 filters the high-pressure gas to remove impurities in the gas, the filtered high-pressure gas enters the heat exchanger 6, and the high-pressure gas exchanges heat with the exhaust gas in the exhaust pipeline 5 in the heat exchanger 6 to cool the exhaust gas and preheat the gas in the gas supply pipeline 4, the preheated high-pressure gas enters the gas-liquid separator 42, the gas-liquid separator 42 removes the moisture in the high-pressure gas, the dried high-pressure gas enters the heater 47, the heater 47 heats the high-pressure gas to a set temperature to form high-temperature and high-pressure gas, then the regulating valve 41 is opened, the opening of the regulating valve 41 is controlled, and the high-temperature and high-pressure gas enters the inside of the expander through the regulating valve 41, and the high-temperature and high-pressure gas expands and cools in the inside of the expander to work on the impeller to drive the impeller to rotate;

[0051] 103. Start the driving motor to drive the impeller in the expander to rotate to reach a set rotating speed

[0052] Specifically, when the impeller in the expander reaches the highest rotating speed under the action of the high-temperature and high-pressure gas, the driving motor is started, the driving motor drives the impeller to rotate through the rotating shaft, the driving motor works on the impeller synchronously with the high-temperature and high-pressure gas to drive the impeller to rotate, the rotating speed of the driving motor, i.e. the rotating speed of the impeller, is set, and the stable operation of the expander is maintained when the impeller reaches the set rotating speed.

[0053] 104. Adjust the gas flow in the gas supply pipeline to keep the rotating speed of the impeller constant

[0054] Specifically, the opening of the valve core in the regulating valve is set to 40%, 45% and 50% respectively to test the expander, first, the opening of the regulating valve is set to 40%, the gas flow in the gas supply pipeline 4 is reduced, the work of the high-temperature and high-pressure gas on the expander is reduced, the power of the driving motor 2 is increased to keep the rotating speed of the impeller constant, the expander is kept running for 4 hours when the impeller is stable at the constant rotating speed, and the opening of the regulating valve is adjusted to 45% and 50% respectively, and then the expander is kept running for more than 4 hours.

[0055] 105. Measure the operating parameters of the expander under different gas flows

[0056] Specifically, when the opening of the regulating valve 41 is set to 40%, the expander is kept running for more than 4 hours, the temperature sensor 51 in the exhaust pipeline 5 continuously monitors the outlet gas temperature of the expander, the average outlet gas temperature is obtained according to multiple outlet gas temperatures measured during the continuous operation of the expander, and the opening of the regulating valve 41 is set to 45% and 50% respectively to measure the average outlet gas temperature, and the following data is obtained:

[0057] The air compressor pressure is set to 0.35 MPa, the expander inlet temperature is about 72℃, the opening of the regulating valve 41 is adjusted to 40%, when the expander impeller speed gradually increases to 6000 rpm, the expander is kept running for more than 4 hours, at this time the average temperature of the expander outlet gas is 39.7℃;

[0058] The opening of the regulating valve 41 is set to 45%, when the expander impeller speed gradually increases to 6000 rpm, the expander is kept running for more than 4 hours, at this time the average temperature of the expander outlet gas is 36.4℃;

[0059] The opening of the regulating valve 41 is set to 50%, when the expander impeller speed gradually increases to 6000 rpm, the expander is kept running for more than 4 hours, at this time the average temperature of the expander outlet gas is 39.6℃;

[0060] 106、Comparative analysis of expander operating parameters under different gas flow to select the best test working condition

[0061] Specifically, the temperature of the expander outlet gas when the expander is running at different openings of the regulating valve 41 is compared, when the opening of the regulating valve is 45%, the temperature of the expander outlet gas is the lowest at a speed of 6000 rpm, that is, the expander is in the best working condition;

[0062] 107、Drive the expander to run continuously under the best test working condition and perform mechanical performance detection

[0063] Specifically, according to the best operating condition of the expander at 6000 rpm obtained above, the expander is driven to run continuously under the best operating condition, and the mechanical characteristics of the expander are detected during the running process, such as the temperature, impeller vibration amplitude and impeller torque of the expander during the running process, so as to obtain the mechanical characteristics of the expander under normal working condition.

[0064] In summary, in the application, the motor and high-pressure gas are used to drive the expander synchronously, the working condition of the large expander in normal operation is simulated, the mechanical performance test of the large expander in the normal operation condition is realized, and the efficiency and accuracy of the characteristic test are improved; in the application, the opening degree of the regulating valve is controlled to measure the outlet gas temperature of the expander at different opening degrees, the rapid adjustment of the optimal operation condition of the expander is realized, the test of the expander in the optimal condition is ensured, and the accuracy of the test is improved; in the application, the heat exchanger is arranged to connect the gas supply pipeline and the exhaust pipeline, the high-temperature gas discharged from the expander outlet enters the heat exchanger, the high-pressure gas in the gas supply pipeline enters the heat exchanger and exchanges heat with the high-temperature gas in the exhaust pipeline, the gas in the exhaust pipeline is cooled, and the high-pressure gas in the gas supply pipeline is preheated at the same time, the heat recovery is realized, and the energy is saved. Therefore, the application effectively overcomes the shortcomings in the prior art and has high industrial utilization value.

[0065] The above embodiments only exemplarily illustrate the principles and effects of the application, and are not used to limit the application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the application should be covered in the protection scope of the application.

Claims

1. An electrically linked expander test device, characterized by, The device comprises an expander test bench (1), a driving motor (2), a gas supply pipeline (4) and a gas exhaust pipeline (5), the expander test bench (1) is used for installing an expander to be tested, the driving motor (2) is arranged on one side of the expander test bench (1), the driving motor (2) is connected with a rotating shaft of an impeller inside the expander, the gas supply pipeline (4) is sequentially provided with an air compressor (46), a gas storage tank (45), a heater (47) and a regulating valve (41), the air compressor (46) is communicated with an inlet of the gas storage tank (45), an outlet of the gas storage tank (45) is communicated with an inlet of the heater (47), an outlet of the heater (47) is communicated with an inlet of the regulating valve (41), an outlet of the regulating valve (41) is communicated with an inlet of the expander, the gas exhaust pipeline (5) is communicated with an exhaust port of the expander, and a temperature sensor (51) is arranged in the gas exhaust pipeline (5).

2. The electrically linked expander test device of claim 1, wherein: A filter (44) is arranged at an outlet of the gas storage tank (45) in the gas supply pipeline (4).

3. The electrically linked expander test device of claim 1, wherein: The device further comprises a heat exchanger (6), the heat exchanger (6) is respectively communicated with the gas supply pipeline (4) and the gas exhaust pipeline (5).

4. The electrically linked expander test device of claim 3, wherein: The gas supply pipeline (4) is provided with a cold dryer (43) and a gas-liquid separator (42) between the heat exchanger (6) and the heater (47), an inlet of the cold dryer (43) is communicated with an outlet of the heat exchanger (6), an outlet of the cold dryer (43) is communicated with an inlet of the gas-liquid separator (42), and an outlet of the gas-liquid separator (42) is communicated with an inlet of the heater (47).

5. The electrically linked expander test device of claim 1, wherein: The device further comprises a mechanical property detection device (3), the mechanical property detection device (3) is connected with the expander and used for detecting mechanical properties of the expander.

6. A test method based on the test apparatus for an electrically linked expander as claimed in any one of claims 1 to 5, characterized by the steps of The device comprises: connecting the expander with the gas supply pipeline, the gas exhaust pipeline and the driving motor; opening valves in the gas supply pipeline and the gas exhaust pipeline to drive the expander to operate; starting the driving motor to drive the impeller in the expander to rotate to a set rotating speed; adjusting the gas flow in the gas supply pipeline to keep the rotating speed of the impeller constant; measuring operating parameters of the expander under different gas flows; comparatively analyzing the operating parameters of the expander under different gas flows to select an optimal test working condition; driving the expander to continuously operate under the optimal test working condition and performing mechanical property detection.

7. The test method of claim 6, wherein: The step of connecting the expander with the gas supply pipeline, the gas exhaust pipeline and the driving motor comprises: connecting an inlet of the expander with the gas supply pipeline, connecting an exhaust port of the expander with the gas exhaust pipeline, and connecting the driving motor with a rotating shaft of the impeller inside the expander through a coupling.

8. The test method of claim 6, wherein: The step of adjusting the gas flow in the gas supply pipeline to keep the rotating speed of the impeller constant comprises: arranging a regulating valve in the gas supply pipeline and adjusting the gas flow in the gas supply pipeline by controlling the opening degree of a valve core in the regulating valve.

9. The test method of claim 8, wherein: The step of measuring the operating parameters of the expander under different gas flows comprises: setting different opening degrees of the regulating valve, driving the expander to continuously operate for a set time under the different opening degrees of the regulating valve, and measuring the gas temperature at an outlet of the expander.

10. The test method of claim 9, wherein: The comparative analysis selects the optimal test working condition of the expander under different gas flow, and the steps include: comparing the outlet gas temperature of the expander under different opening degrees of the adjusting valve, and selecting the operation working condition with the lowest outlet gas temperature as the optimal test working condition.

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