Water vapor centrifugal compressor performance testing device and testing method

Abstract

The application discloses a water vapor centrifugal compressor performance testing device and testing method, and belongs to the technical field of compressors. The device comprises a main testing system, which is connected with a heat engine and working condition adjusting system, an air suction dryness testing system and a spraying cooling system. The main testing system comprises an oil tank, which is connected with an oil cooler, the oil cooler is connected with a gear transmission box, the gear transmission box is connected with a variable frequency motor, the gear transmission box is connected with a compressor unit, and the compressor unit is connected with the heat engine and working condition adjusting system, the air suction dryness testing system and the spraying cooling system. The compressor unit comprises a plurality of compressors, and the pipeline of the compressor is connected with a flowmeter. The application is used for on-line performance testing of single-stage or multi-stage water vapor centrifugal compressors, and the testing device heats and produces water vapor by compressing the air inhaled by the air heat engine to generate motor power consumption, without the need of an additional steam generator.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a performance testing device and method for a steam centrifugal compressor. Background Technology

[0002] As a key piece of equipment in industrial energy recovery and application, the performance testing of the core component, the steam centrifugal compressor, is particularly important. In practical applications, performance testing devices for steam centrifugal compressors often struggle to accurately simulate various complex operating conditions. Existing technologies lack a professional testing system that is versatile, stable, and capable of accurately simulating various operating conditions.

[0003] For related technologies, please refer to Chinese Patent No. CN120083683B, which discloses a performance testing system and method for a self-circulating steam compressor.

[0004] Regarding the aforementioned technologies, current common performance testing devices for steam centrifugal compressors suffer from the following problems: traditional performance testing devices typically require a steam boiler or steam heat pump and are therefore complex and costly. Furthermore, their testing range is limited, usually only applicable to single-stage centrifugal compressors. Therefore, a novel performance testing device for steam centrifugal compressors is urgently needed to address these technical issues. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a steam centrifugal compressor performance testing device and method for online performance testing of single-stage or multi-stage steam centrifugal compressors. This invention designs a steam centrifugal compressor performance testing device for testing the performance of 1-4 stage steam centrifugal compressors. The testing device heats and produces steam by compressing the air drawn in by the air heat engine to generate motor power consumption, eliminating the need for an additional steam generator.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] A performance testing device for a steam centrifugal compressor includes a main testing system, on which a heat engine and operating condition regulation system, a suction dryness testing system, and a spray cooling system are connected.

[0008] The main testing system includes an oil tank, an oil cooler connected to the oil tank, a gearbox connected to the oil cooler, a variable frequency motor connected to the gearbox, a compressor unit connected to the gearbox, and the compressor unit connected to the heat engine and operating condition regulation system, the intake dryness testing system, and the spray cooling system, respectively.

[0009] The compressor unit consists of several compressors, and flow meters are connected to the compressor pipelines.

[0010] Furthermore, the inhalation dryness testing system includes an electric heater and several pressure and temperature measuring points. The electric heater is placed between the several pressure and temperature measuring points, and the several pressure and temperature measuring points are interconnected with the electric heater.

[0011] Furthermore, the heat engine and operating condition regulation system includes a heat engine air inlet, a pressure relief regulating valve, and a suction pressure regulating valve connected in sequence.

[0012] Furthermore, the spray cooling system includes an inlet gas-liquid separator, a multi-stage gas-liquid separator, a water pump, and a soft water tank. The inlet gas-liquid separator and the multi-stage gas-liquid separator are respectively connected to the soft water tank, and the soft water tank is connected to the water pump.

[0013] Furthermore, the soft water tank is connected to a soft water device, an overflow valve, and a drain outlet, and the soft water device is connected to a tap water inlet.

[0014] Furthermore, cooling check valves are provided between the inlet gas-liquid separator and the soft water tank, and between the multi-stage gas-liquid separator and the soft water tank.

[0015] Furthermore, an oil mist fan is connected to the oil tank.

[0016] Furthermore, a filter is provided between the oil cooler and the gearbox.

[0017] A test method for a performance testing device for a steam centrifugal compressor includes the following steps:

[0018] Step 1: At the start of the test, first open the valve at the air inlet of the heat engine and operating condition regulation system, close the pressure relief regulating valve, start the heat engine and operating condition regulation system, and the compressor will automatically draw in air and begin compression. Adjust the suction and pressure regulating valve to establish the suction and discharge pressure difference.

[0019] Step 2: Once the exhaust temperature rises above 100℃, turn on the spray cooling system. At this time, water vapor will be rapidly generated in the spray cooling system. Then, gradually close the valve of the air inlet of the hot engine and adjust the pressure relief valve and suction pressure regulating valve of the hot engine and operating condition regulation system to stabilize the suction pressure at the test condition. At this time, monitor the suction superheat and calculate it with pure water vapor.

[0020] Step 3: When the superheat rises from negative superheat to 0, it can be considered that the air in the spray cooling system has been completely discharged from the pressure relief valve. At this time, the spray cooling system is in pure water vapor circulation, and the system can be adjusted to the test condition point for performance testing.

[0021] Step 4: Control the amount of water vapor circulating in the spray cooling system through the pressure relief regulating valve of the heat engine and operating condition regulation system, adjust the suction and discharge pressure difference through the suction pressure regulating valve of the heat engine and operating condition regulation system, and adjust the suction superheat through the spray water regulating valve of the spray cooling system to complete the performance test of the compressor.

[0022] Furthermore, in step four, to test the dryness of the intake air, the dryness test valve at the intake port needs to be opened, and a small amount of intake water vapor is taken into the intake dryness test system. By detecting the input power of the electric heater, the pressure and temperature state before and after heating, and the water vapor flow rate of the intake dryness test system, the dryness of the water vapor in the pipeline is calculated by the law of conservation of energy.

[0023] In summary, compared with the prior art, the beneficial effects of the above technical solution are:

[0024] 1. This invention is used for online performance testing of single-stage or multi-stage steam centrifugal compressors. This invention designs a steam centrifugal compressor performance testing device for testing the performance of 1-4 stage steam centrifugal compressors. The testing device compresses the air drawn in by the air heat engine and uses the generated motor power consumption to heat and produce steam, without the need for an additional steam generator.

[0025] 2. The testing principle of this invention is designed based on the air-ring performance test method. It consists of an integrated oil station, gearbox, spray cooling system, heat engine and operating condition regulation system, suction dryness test system, and necessary valves and instruments. During the test, the centrifugal compressor under test is connected to the pipeline reserved in the device. First, the air drawn in by the air heat engine is compressed. After the exhaust temperature rises to above 100°C, the spray cooling system is turned on to cool it down to the compressor inlet temperature. Then, it returns to the compressor inlet to form an air ring. Water vapor is continuously generated in the system and discharged with the air. After the air is discharged, the suction and exhaust pressures can be adjusted to the operating condition to be tested. With the addition of various testing instruments and auxiliary pipeline equipment, the performance of the centrifugal compressor can be tested. Attached Figure Description

[0026] Figure 1 This is a schematic diagram showing the connection of each system in the two-stage compression according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram showing the connection of the components in the two-stage compression according to an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Main testing system; 11. Oil tank; 111. Oil mist fan; 12. Oil cooler; 121. Water inlet; 122. Water outlet; 13. Filter; 14. Gearbox; 15. Variable frequency motor; 16. Primary compressor; 17. Secondary compressor; 18. Primary exhaust flow meter; 19. Secondary exhaust flow meter; 110. Intake flow meter; 2. Heat engine and operating condition regulation system; 21. Discharge pressure regulating valve; 22. Suction and pressure regulating valve 1. Air throttle valve; 23. Hot air inlet; 3. Spray cooling system; 31. Inlet gas-liquid separator; 32. Multi-stage gas-liquid separator; 33. Cooling flow meter; 34. Cooling check valve; 35. Water pump; 36. Soft water tank; 361. Overflow valve; 362. Sewage outlet; 37. Soft water device; 38. Tap water inlet; 4. Suction dryness test system; 41. Pressure and temperature measuring point one; 42. Pressure and temperature measuring point two; 43. Electric heater. Detailed Implementation

[0030] The principles and features of the present invention are described below with reference to all the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0031] This invention discloses a performance testing device and method for a steam centrifugal compressor.

[0032] Reference Figure 1 and Figure 2 As shown, the present invention is used for online performance testing of single-stage or multi-stage steam centrifugal compressors. It is typically used to test the performance of 1-4 stage steam centrifugal compressors. The testing device compresses the air drawn in by the air heat engine and uses the generated motor power consumption to heat and produce steam, without the need for an additional steam generator.

[0033] A performance testing device for a steam centrifugal compressor includes a main testing system 1, on which a heat engine and operating condition regulation system 2, a suction dryness testing system 4, and a spray cooling system 3 are connected.

[0034] The main testing system 1 includes an oil tank 11, an oil mist fan 111 connected to the oil tank 11, an oil cooler 12 connected to the oil tank 11, an inlet 121 and an outlet 122 connected to the oil cooler 12, a gearbox 14 connected to the oil cooler 12, a filter 13 provided between the oil cooler 12 and the gearbox 14, a variable frequency motor 15 connected to the gearbox 14, a compressor unit connected to the gearbox 14, and the compressor unit connected to the heat engine and operating condition regulation system 2, the air intake dryness testing system 4 and the spray cooling system 3.

[0035] The compressor unit includes several compressors. In this embodiment, it includes two compressors: a primary compressor 16 and a secondary compressor 17. Both the primary compressor 16 and the secondary compressor 17 are connected to flow meters. In this embodiment, the flow meters include a primary exhaust flow meter 18, a secondary exhaust flow meter 19, and an intake flow meter 110. The primary exhaust flow meter 18 is connected to the connecting pipeline between the primary compressor 16 and the multi-stage gas-liquid separator 32. The secondary exhaust flow meter 19 is connected to the connecting pipeline between the secondary compressor 17 and the inlet gas-liquid separator 31. The intake flow meter 110 is connected to the connecting pipeline between the primary compressor 16 and the multi-stage gas-liquid separator 32. It should be noted that the connection method between the flow meters and the pipeline is existing technology and will not be specifically described in this embodiment.

[0036] The inhalation dryness testing system 4 includes an electric heater 43 and several pressure and temperature measuring points. In this embodiment, the several pressure and temperature measuring points include two pressure and temperature measuring points, namely pressure and temperature measuring point one 41 and pressure and temperature measuring point two 42. The electric heater 43 is placed between pressure and temperature measuring point one 41 and pressure and temperature measuring point two 42. Pressure and temperature measuring point one 41 and pressure and temperature measuring point two 42 are respectively connected to the electric heater 43.

[0037] The testing device includes a suction dryness testing system 4 located at the compressor inlet. Water vapor centrifugal compressors have certain requirements on the liquid carryover at the compressor inlet. Traditional dryness testing systems typically employ methods such as gravimetric weighing or throttling, which have drawbacks such as large equipment size and limitations imposed by water vapor pressure. The testing device of this invention has a parallel testing pipeline in the compressor inlet pipe, equipped with an electric heater 43 and a flow meter. Pressure and temperature measuring points are located before and after the electric heater 43. During the test, by comparing the pressure and temperature states before and after the input power of the electric heater 43, the water vapor dryness of the inlet pipe can be calculated. This suction dryness testing system 4 allows for comparison of the impact of different dryness levels on compressor performance.

[0038] The heat engine and operating condition regulation system 2 includes a heat engine air inlet 23, a pressure relief regulating valve 21, and a suction pressure regulating valve 22, which are connected sequentially. The operating condition regulation system of the testing device is equipped with at least one pressure relief regulating valve 21 and at least one suction pressure regulating valve 22. The pressure relief regulating valve 21 regulates the total circulating volume of the working fluid within the testing device, while the suction pressure regulating valve 22 regulates the suction and exhaust pressure difference. The combined action of the pressure relief regulating valve 21 and the suction pressure regulating valve 22 enables the testing device to quickly reach the required testing conditions, thereby improving testing efficiency.

[0039] The spray cooling system 3 includes an inlet gas-liquid separator 31, a multi-stage gas-liquid separator 32, a water pump 35, and a soft water tank 36. The water pump 35 is preferably a variable frequency constant pressure, high-lift water pump. The inlet gas-liquid separator 31 and the multi-stage gas-liquid separator 32 are respectively connected to the soft water tank 36, which is connected to the water pump 35. The soft water tank 36 is connected to a soft water device 37, an overflow valve 361, and a drain outlet 362. The soft water device 37 is connected to a tap water inlet 38. Cooling check valves 34 are installed between the inlet gas-liquid separator 31 and the soft water tank 36, and between the multi-stage gas-liquid separator 32 and the soft water tank 36. Several cooling flow meters 33 are installed within the spray cooling system 3 as needed.

[0040] The testing device is equipped with a spray cooling system 3, which sprays atomized water through nozzles to cool the exhaust gas of each stage of the compressor, achieving the required intake temperature for testing and thus forming a gas ring test. The spray cooling system 3 atomizes high-pressure water and sprays it into the interstage desuperheating pipes. These pipes are designed with multiple specifications of inner cylinder heat bushings based on fluid and thermodynamic calculations. Different inner cylinder heat bushings can be replaced according to the test conditions to ensure effective cooling. A high-pressure variable frequency water pump 35 is installed before the atomizing nozzles to ensure that sufficient atomized droplets can be sprayed into the pipes even under high pressure for cooling, achieving controllable superheat. A gas-liquid separator is installed after the desuperheater to ensure no large droplets at the compressor inlet. The gas-liquid separator drainage pipe has both pump and valve drainage control methods, and a check valve is also included to ensure that the compressor inlet can be tested from negative pressure to positive pressure, thus expanding the testing range of the device.

[0041] The testing device of this invention does not require a boiler, heat pump, or other steam generator. The device is equipped with an air inlet and outlet for an air-heating engine. During startup, the compressor operates at low frequency, drawing air from the atmosphere through the air inlet 23 for compression and circulation. Limiting the design power limit at each frequency, the frequency is gradually increased. When the exhaust temperature exceeds 100°C, the exhaust and spray cooling system 3 is activated, generating water vapor within it. The air inlet 23 is gradually closed, while the outlet is gradually opened to release the air from the spray cooling system 3. Once the air is completely expelled, the performance test of the steam centrifugal compressor can begin. This effectively shortens the cycle time of the pure steam working fluid and improves testing efficiency. The entire testing device is equipped with an insulation layer to ensure negligible heat loss and improve testing accuracy.

[0042] The implementation principle of a performance testing device for a steam centrifugal compressor according to an embodiment of the present invention is as follows:

[0043] The testing principle of this invention is based on the gas ring performance test method. It consists of an integrated oil station (not shown in the figure) of the main test system 1, a spray cooling system 3, a heat engine and operating condition regulation system 2, a suction dryness test system 4, and necessary valves and instruments. During the test, the centrifugal compressor under test is connected to the pipeline reserved in the device. The air heat engine draws in air and then compresses the air. After the exhaust temperature rises to above 100°C, the spray cooling system is turned on to cool the air down to the compressor inlet temperature. Then, the air returns to the compressor inlet to form a gas ring. Water vapor is continuously generated in the system and discharged with the air. After the air is discharged, the suction and exhaust pressures can be adjusted to the operating condition to be tested. With the addition of various testing instruments and auxiliary pipeline equipment, the performance of the centrifugal compressor can be tested.

[0044] Reference Figure 1 and Figure 2 As shown, a test method for a performance testing device for a steam centrifugal compressor includes the following steps:

[0045] Step 1: At the start of the test, first open the valve at the air inlet 23 of the hot engine and operating condition regulation system 2, close the pressure relief regulating valve 21, start the hot engine and operating condition regulation system 2, the compressor automatically draws in air and begins to compress, adjust the suction and pressure regulating valve 22 to establish the suction and discharge pressure difference.

[0046] Step 2: Once the exhaust temperature rises above 100℃, turn on the spray cooling system 3. At this time, water vapor will be rapidly generated in the spray cooling system 3. Then, gradually close the valve of the hot air inlet 23 of the hot engine and adjust the pressure regulating valve 21 and the suction pressure regulating valve 22 of the hot engine and operating condition regulating system 2 to stabilize the suction pressure at the operating condition to be tested. At this time, monitor the suction superheat and calculate it using pure water vapor.

[0047] Step 3: When the superheat rises from negative superheat to 0, it can be considered that the air in the spray cooling system 3 has been completely discharged from the pressure regulating valve 21. At this time, the spray cooling system 3 is in pure water vapor circulation, and the system can be adjusted to the test condition point for performance testing.

[0048] Step 4: Control the amount of water vapor circulating in the spray cooling system 3 by controlling the pressure relief regulating valve 21 of the heat engine and operating condition regulation system 2, adjust the suction and discharge pressure difference by controlling the suction pressure regulating valve 22 of the heat engine and operating condition regulation system 2, and adjust the suction superheat by controlling the water spray regulating valve of the spray cooling system 3 to complete the performance test of the compressor.

[0049] To test the dryness of the intake air, the dryness test valve at the intake port needs to be opened, and a small amount of intake water vapor is taken into the intake dryness test system 4. By detecting the input power of the electric heater 43, the pressure and temperature state before and after heating, and the water vapor flow rate of the intake dryness test system 4, the dryness of the water vapor in the pipeline is calculated by the law of conservation of energy.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A test method for a performance testing device for a steam centrifugal compressor, comprising a main testing system (1), characterized in that, The main testing system (1) is connected to a heat engine and operating condition regulation system (2), an air dryness testing system (4), and a spray cooling system (3); The main testing system (1) includes an oil tank (11), an oil cooler (12) connected to the oil tank (11), a gearbox (14) connected to the oil cooler (12), a variable frequency motor (15) connected to the gearbox (14), a compressor unit connected to the gearbox (14), and the compressor unit connected to the heat engine and operating condition regulation system (2), the air intake dryness testing system (4), and the spray cooling system (3), respectively. The spray cooling system (3) includes an inlet gas-liquid separator (31), a multi-stage gas-liquid separator (32), a water pump (35), and a soft water tank (36). The inlet gas-liquid separator (31) and the multi-stage gas-liquid separator (32) are respectively connected to the soft water tank (36), and the soft water tank (36) is connected to the water pump (35). The compressor unit consists of several compressors, and flow meters are connected to the compressor pipelines; Its testing methods include: Step 1: At the start of the test, first open the valve at the air inlet (23) of the heat engine and operating condition regulation system (2), close the pressure relief regulating valve (21), start the heat engine and operating condition regulation system (2), the compressor automatically draws in air and starts to compress, adjust the suction pressure regulating valve (22), and establish the suction and discharge pressure difference; Step 2: When the exhaust temperature rises to above 100℃, turn on the spray cooling system (3). At this time, water vapor will be generated rapidly in the spray cooling system (3). Then, gradually close the valve of the air inlet (23) of the heat engine and adjust the pressure regulating valve (21) and suction pressure regulating valve (22) of the heat engine and operating condition regulating system (2) to stabilize the suction pressure at the operating condition to be tested. At this time, monitor the suction superheat and calculate it with pure water vapor. Step 3: When the superheat rises from negative superheat to 0, it can be considered that the air in the spray cooling system (3) has been completely discharged from the pressure regulating valve (21). At this time, the spray cooling system (3) is in pure water vapor circulation, and it can be adjusted to the test condition point for performance testing. Step 4: Control the amount of water vapor circulating in the spray cooling system (3) by the pressure regulating valve (21) of the heat engine and operating condition regulation system (2), adjust the suction and discharge pressure difference by the suction pressure regulating valve (22) of the heat engine and operating condition regulation system (2), and adjust the suction superheat by the spray water regulating valve of the spray cooling system (3) to complete the performance test of the compressor.

2. The test method for a steam centrifugal compressor performance testing device according to claim 1, characterized in that: In step four, if the dryness of the intake air is to be tested, the dryness test valve of the intake port needs to be opened, and a small amount of intake water vapor is taken into the intake dryness test system (4). By detecting the input power of the electric heater (43) and the pressure and temperature state before and after heating, as well as the water vapor flow rate of the intake dryness test system (4), the dryness of the water vapor in the pipeline is calculated by the law of conservation of energy.

3. The test method for a steam centrifugal compressor performance testing device according to claim 1, characterized in that: The inhalation dryness test system (4) includes an electric heater (43) and several pressure and temperature measuring points. The electric heater (43) is placed between the several pressure and temperature measuring points, and the several pressure and temperature measuring points are interconnected with the electric heater (43).

4. The test method for a steam centrifugal compressor performance testing device according to claim 1, characterized in that: The heat engine and operating condition regulation system (2) includes a pressure relief regulating valve (21), a suction regulating valve (22), and a heat engine air inlet (23) connected in sequence.

5. The test method for a steam centrifugal compressor performance testing device according to claim 4, characterized in that: The soft water tank (36) is connected to a soft water device (37), an overflow valve (361), and a drain outlet (362). The soft water device (37) is connected to a tap water inlet (38).

6. The test method for a steam centrifugal compressor performance testing device according to claim 5, characterized in that: Cooling check valves (34) are provided between the inlet gas-liquid separator (31) and the soft water tank (36), and between the multi-stage gas-liquid separator (32) and the soft water tank (36).

7. The test method for a steam centrifugal compressor performance testing device according to claim 1, characterized in that: An oil mist fan (111) is connected to the oil tank (11).

8. The test method for a steam centrifugal compressor performance testing device according to claim 1, characterized in that: A filter (13) is provided between the oil cooler (12) and the gearbox (14).

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