Energy-saving steam compressor test device and its test method

Abstract

An energy-saving steam compressor test device and its test method. The test device includes an intake pipeline, an exhaust pipeline, an air intake pipeline, a water supply pipeline, a bypass pressure reducing valve, a steam discharge valve, a drain valve, a thermal power conversion device, and a drive motor. The gas inlet of the exhaust pipeline is used to communicate with the exhaust port of the steam compressor, and the gas outlet is respectively communicated with the inlet of the bypass pressure reducing valve and the inlet of the inlet valve of the thermal power conversion device. The outlets of the bypass pressure reducing valve, the thermal power conversion device, and the air intake pipeline are communicated with the gas inlet of the intake pipeline, and the gas outlet of the intake pipeline and the water outlet of the water supply pipeline are communicated with the intake port of the steam compressor. The inlets of the steam discharge valve and the drain valve are respectively communicated with the exhaust pipeline; the drive motor is used to drive the steam compressor; the thermal power conversion device is used to directly drive the steam compressor to be tested or provide power for the drive motor. The structure of the present invention is compact, the operation is energy-saving, and the steam energy discharged to the outside is less.

Description

Technical Field

[0001] The present invention relates to the technology of steam compressors, and particularly to the test technology of steam compressors. Background Art

[0002] A steam compressor test device can be used to test the performance of a steam compressor. A patent application with the application number 201711035807.9 and the invention name "Steam Compressor Test Device and Its Test Method" discloses a steam compressor test device, which can produce steam by itself and recycle it, and reach the required test conditions through parameter adjustment, thus avoiding the need for an additional boiler system during the test stage. However, this device still has the following three limitations:

[0003] 1. A low-pressure pressure stabilizing tank and a high-pressure separation tank are respectively arranged on the inlet side and the outlet side of the compressor. They are large in mass and volume and have a slow temperature rise, resulting in a long preparation time for heating before the test.

[0004] 2. The circulating high-pressure steam is directly decompressed by a bypass pressure reducing valve, resulting in a large energy loss during normal tests. The energy is finally converted into steam emissions, causing excessive steam emissions on site.

[0005] 3. When testing a high-power unit, a relatively large drive motor needs to be supported. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a steam compressor test device with a compact structure, energy-saving operation, and less steam energy discharged to the outside.

[0007] Another technical problem to be solved by the present invention is to provide a test method for a steam compressor.

[0008] An embodiment of the present invention provides an energy-saving steam compressor test device, which includes an intake pipeline, an exhaust pipeline, an air intake pipeline, a water supply pipeline, a bypass pressure reducing valve, a steam discharge valve, a drain valve, a thermal power conversion device and a drive motor; an intake pressure measuring device and an intake temperature measuring device are provided on the intake pipeline; an exhaust pressure measuring device and an exhaust temperature measuring device are provided on the exhaust pipeline; an air intake valve is provided on the air intake pipeline, and an inlet valve is provided at the inlet of the thermal power conversion device; the gas inlet of the exhaust pipeline is used to communicate with the exhaust port of the steam compressor to be tested, the gas outlet of the exhaust pipeline is respectively communicated with the inlet of the bypass pressure reducing valve and the inlet of the inlet valve of the thermal power conversion device, the outlet of the bypass pressure reducing valve, the outlet of the thermal power conversion device and the air outlet of the air intake pipeline are respectively communicated with the gas inlet of the intake pipeline, and the gas outlet of the intake pipeline and the water outlet of the water supply pipeline are respectively communicated with the intake port of the steam compressor to be tested; the inlet of the steam discharge valve and the inlet of the drain valve are respectively communicated with the exhaust pipeline, the outlet of the steam discharge valve is used to discharge steam to the outside, and the outlet of the drain valve is used to drain water to the outside; the drive motor is used to drive the steam compressor to be tested; the thermal power conversion device is used to directly drive the steam compressor to be tested or to drive a generator to generate electricity to provide power for the drive motor.

[0009] An embodiment of the present invention provides a method for testing a steam compressor with an energy-saving steam compressor test device, which includes the following steps:

[0010] Open the air intake valve, start the steam compressor to be tested, and adjust the opening degree of the bypass pressure reducing valve until the measured value of the intake pressure of the steam compressor is stable at normal pressure and the ratio of the measured value of the exhaust pressure of the steam compressor to the measured value of the intake pressure is within the set pressure ratio range, then close the air intake valve;

[0011] Adjust the opening degree of the steam discharge valve until the measured value of the exhaust pressure of the steam compressor reaches more than 95% of the steam saturation pressure corresponding to the measured value of the exhaust temperature;

[0012] Respectively adjust the opening degree of the bypass pressure reducing valve, the opening degree of the inlet valve of the thermal power conversion device, the opening degree of the steam discharge valve, the opening degree of the water supply valve and the rotational speed of the steam compressor until the operating conditions of the steam compressor required for the test are simulated.

[0013] The present invention includes the following advantages and characteristics:

[0014] 1. Compared with the prior art, the steam compressor test device of this embodiment cancels the separation tank and the pressure stabilizing tank, reducing the volume and weight of the test device, and significantly reducing the energy required for metal heating, which can shorten the preheating time of the test device;

[0015] 2. In this embodiment, a thermo-mechanical power conversion device is used to recover the pressure energy of the steam compressor from exhaust to intake, reducing the system energy consumption and simultaneously reducing the emissions of electric energy converted into steam.

[0016] 3. When recovering energy using the direct drive method in this embodiment, the driving power of the drive motor can be supplemented, thereby reducing the required rated power of the drive motor and lowering the initial investment cost of the drive motor. Therefore, it is particularly suitable for the test of high-power steam compressor units. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The structural schematic diagram of an energy-saving steam compressor test device according to the first embodiment of the present invention is shown.

[0018] Figure 2 The structural schematic diagram of an energy-saving steam compressor test device according to the second embodiment of the present invention is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0020] Figure 1 The structural schematic diagram of an energy-saving steam compressor test device according to the first embodiment of the present invention is shown. Please refer to Figure 1 . The energy-saving steam compressor test device 100 according to the first embodiment of the present invention includes an intake pipe 1, an exhaust pipe 2, an air intake pipe 3, a water supply pipe 4, a bypass pressure reducing valve 51, a steam discharge valve 52, a drain valve 53, a thermo-mechanical power conversion device 61, and a drive motor 62.

[0021] An intake pressure measuring device 71 and an intake temperature measuring device 72 are provided on the intake pipe 1. An exhaust pressure measuring device 73, an exhaust temperature measuring device 74, and a drain liquid level measuring device 75 are provided on the exhaust pipe 2. An air intake valve 54 is provided on the air intake pipe 3, and an inlet valve 55 is provided at the inlet of the thermo-mechanical power conversion device 61.

[0022] The gas inlet of the exhaust pipe 2 is used to communicate with the exhaust port of the steam compressor 9 to be tested. The gas outlet of the exhaust pipe 2 is respectively communicated with the inlet of the bypass pressure reducing valve 51 and the inlet of the inlet valve 55 of the thermo-mechanical power conversion device 61. The outlet of the bypass pressure reducing valve 51, the outlet of the thermo-mechanical power conversion device 61, and the air outlet of the air intake pipe 3 are respectively communicated with the gas inlet of the intake pipe 1. The gas outlet of the intake pipe 1 and the water outlet of the water supply pipe 4 are respectively communicated with the intake port of the steam compressor 9 to be tested. The inlet of the steam discharge valve 52 and the inlet of the drain valve 53 are respectively communicated with the exhaust pipe 2. The outlet of the steam discharge valve 52 is used to discharge steam to the outside, and the outlet of the drain valve 53 is used to drain water to the outside.

[0023] In this first embodiment, the thermo - dynamic power conversion device 61 is used to directly drive the steam compressor 9 to be tested. Among them, the power output shaft of the thermo - dynamic power conversion device 61 and the output shaft of the drive motor 62 are respectively connected to the first input end and the second input end of the gearbox 63, and the output end of the gearbox 63 is used to connect to the power input shaft of the steam compressor 9 to be tested. The thermo - dynamic power conversion device 61 and the drive motor 62 jointly drive the steam compressor 9 through the gearbox 63. Optionally, the thermo - dynamic power conversion device 61 is an expander, and the expander can be a positive - displacement expander or a dynamic expander. The drive motor 62 can be, for example, an electric motor.

[0024] Further, a pressure - relief safety valve 56 is provided on the exhaust gas pipeline 2. The inlet of the pressure - relief safety valve 56 is communicated with the exhaust gas pipeline 2, and the outlet of the pressure - relief safety valve 56 is used to discharge steam to the outside. In this embodiment, the outlets of the steam discharge valve 52 and the pressure - relief safety valve 56 are both communicated with the steam discharge port.

[0025] Further, the exhaust gas pipeline 2 includes a vertical pipe section 2a for gas - liquid separation. The drain valve 53 and the drain liquid level measuring device 75 are respectively arranged at the lower part of the vertical pipe section 2a, and the steam discharge valve 52 and the pressure - relief safety valve 56 are respectively arranged at the upper part of the vertical pipe section 2a.

[0026] Further, a water supply valve 57, a water supply flow detection device 76 and a water supply pressure detection device 77 are provided on the water supply pipeline 4.

[0027] In this embodiment, the intake pressure measuring device 71 and the intake temperature measuring device 72 are respectively an intake pressure transmitter and an intake temperature transmitter, the exhaust pressure measuring device 73 and the exhaust temperature measuring device 74 are respectively an exhaust pressure transmitter and an exhaust temperature transmitter, the drain liquid level measuring device is a drain liquid level transmitter, and the water supply flow detection device 76 and the water supply pressure detection device 77 are respectively a water supply flow transmitter and a water supply pressure transmitter. The steam compressor test device includes a controller (in this embodiment, a PLC controller is used). The signal output ends of the intake pressure transmitter, the intake temperature transmitter, the exhaust pressure transmitter, the exhaust temperature transmitter, the drain liquid level transmitter, the water supply flow transmitter and the water supply pressure transmitter are respectively connected to the input end of the controller, and the output end of the controller is respectively connected to the control input ends of the bypass pressure - reducing valve, the inlet valve of the thermo - dynamic power conversion device, the steam discharge valve, the drain valve and the water supply valve.

[0028] Figure 2Fig. 0 shows a schematic structural diagram of an energy-saving steam compressor test device 100a according to the second embodiment of the present invention. The main difference between the second embodiment and the first embodiment is that in the second embodiment, the thermo-mechanical power conversion device 61 does not directly drive the steam compressor 9, but drives the generator 64, and the steam compressor 9 is driven by the drive motor 62; the electric energy generated by the generator 64 is supplied to the drive motor 62 to supplement part of the power consumption.

[0029] The method for testing a steam compressor using the energy-saving steam compressor test device of this embodiment includes the following steps:

[0030] Pressurization step

[0031] Open the bypass pressure reducing valve 51 and the inlet valve 55 of the thermo-mechanical power conversion device. The opening degree of the inlet valve 55 of the thermo-mechanical power conversion device is set to the minimum opening degree that can maintain the operation of the thermo-mechanical power conversion device. The steam discharge valve 52, the drain valve 53, and the water supply valve 57 are in the closed state. Open the air intake valve 54, start the drive motor 62, drive the steam compressor 9 to be tested to operate, and then open the water supply valve 57 on the water supply pipeline to spray water into the inlet of the steam compressor 9.

[0032] During actual operation, by closing the bypass pressure reducing valve 51 slightly, the measured intake air pressure value of the intake air pipeline 1 is made less than the atmospheric pressure, so that air can continuously enter the test device through the air intake valve 54. The measured intake air pressure value of the intake air pipeline 1 and the measured exhaust air pressure value of the exhaust air pipeline 2 will continuously increase. When the measured intake air pressure value is close to the atmospheric pressure, close the bypass pressure reducing valve 51 slightly again, and air will enter the test device again. After multiple repeated adjustments, when the measured intake air pressure value of the steam compressor 9 is stable at normal pressure (i.e., standard atmospheric pressure) and the ratio of the measured exhaust air pressure value of the steam compressor 9 to the measured intake air pressure value is within the set pressure ratio range, close the air intake valve 54 to complete the system pressurization.

[0033] The measured exhaust air pressure value and the measured intake air pressure value are the measured values of the exhaust air pressure measuring device 73 and the intake air pressure measuring device 71 respectively. When the ratio of the measured exhaust air pressure value to the measured intake air pressure value is within the set pressure ratio range, it indicates that the steam compressor is running stably at this time. The set pressure ratio range is determined by the type of the steam compressor to be tested. In this embodiment, the set pressure ratio range is the adiabatic index power of 95% * the internal volume ratio of the steam compressor to the adiabatic index power of 105% * the internal volume ratio of the steam compressor;

[0034] Steam replacement step

[0035] As water continuously enters the steam compressor 9, the work done by the drive motor 62 is gradually converted into steam in the system (steam is formed after water vaporizes). As the amount of steam increases, the measured intake pressure and the measured exhaust pressure will continuously rise. Adjust the opening degree of the steam discharge valve 52 until the measured exhaust pressure of the steam compressor 9 reaches more than 95% (including 95%) of the steam saturation pressure corresponding to the measured exhaust temperature. At this time, it means that most of the air in the test device has been discharged, and the content of steam is continuously increasing, thus completing the steam replacement of the system.

[0036] The condensed water generated by the system will cause the measured drainage liquid level to rise. When the measured drainage liquid level reaches the set liquid level threshold, open the drain valve 53 to discharge the condensed water through the drain valve 53. The measured exhaust temperature and the measured drainage liquid level are the measured values of the exhaust temperature measuring device 74 and the drainage liquid level measuring device 75 respectively.

[0037] Operating condition simulation steps

[0038] Adjust the opening degrees of the bypass pressure reducing valve 51, the inlet valve 55 of the thermo-power conversion device, the steam discharge valve 52, and the rotational speed of the steam compressor 9 respectively until the operating condition of the steam compressor required for the test is simulated. At this time, the compressor power consumption and the suction flow rate under this operating condition can be recorded to achieve the test purpose. During this process, part of the pressure energy is recovered by directly driving the compressor through the thermo-power conversion device or indirectly providing energy for the compressor.

[0039] Adjusting the opening degree of the bypass pressure reducing valve 51 and the inlet valve 55 of the thermo-power conversion device can achieve the purpose of adjusting the intake pressure of the steam compressor, so that the measured intake pressure reaches the test preset value. Adjusting the opening degree of the steam discharge valve 52 can achieve the purpose of adjusting the exhaust back pressure of the steam compressor, so that the measured exhaust pressure reaches the test preset value. Adjusting the opening degree of the water supply valve 57 can achieve the purpose of adjusting the exhaust temperature of the steam compressor, so that the measured exhaust temperature or the measured water supply flow rate (the measured value of the water supply flow detection device 76) reaches the test preset value. By adjusting the rotational speed of the steam compressor 9, the purpose of adjusting the exhaust flow rate can be achieved. Through the power of the drive motor 62 and combined with the power calibrated for the operating condition of the thermo-power conversion device 61, the power required for the test of the steam compressor 9 can be obtained.

[0040] In this embodiment, during the process of simulating the operating condition of the steam compressor required for the test, reduce the opening degree of the bypass pressure reducing valve 51 and increase the opening degree of the inlet valve 55 of the thermo-power conversion device 61, and recover the pressure energy from the high pressure at the outlet of the steam compressor to the low pressure at the inlet through the thermo-power conversion device 61; the recovered energy can directly drive the thermo-power conversion device 61 or indirectly recover the energy through the generator 64.

[0041] The test device of the embodiment of the present invention can significantly reduce the test preparation time. By using a thermal power conversion device to recover the pressure energy from the high pressure at the outlet of the steam compressor to the low pressure at the inlet, the power consumption of the drive motor can be reduced, achieving a greater degree of energy conservation. At the same time, adopting a direct drive recovery method can effectively reduce the power demand of the drive motor, reduce the supporting investment, and enable the test device to ultimately achieve the purpose of rapid testing and energy conservation.

Claims

1. An energy-saving steam compressor test device, characterized in that, It includes an intake pipeline, an exhaust pipeline, an air suction pipeline, a water supply pipeline, a bypass pressure reducing valve, a steam discharge valve, a drain valve, a thermal power conversion device and a drive motor; An intake pressure measuring device and an intake temperature measuring device are provided on the intake pipeline; an exhaust pressure measuring device and an exhaust temperature measuring device are provided on the exhaust pipeline; an air suction valve is provided on the air suction pipeline, and an inlet valve is provided at the inlet of the thermal power conversion device; The gas inlet of the exhaust pipeline is used to communicate with the exhaust port of the steam compressor to be tested. The gas outlet of the exhaust pipeline is respectively communicated with the inlet of the bypass pressure reducing valve and the inlet of the inlet valve of the thermal power conversion device. The outlet of the bypass pressure reducing valve, the outlet of the thermal power conversion device and the air outlet of the air suction pipeline are respectively communicated with the gas inlet of the intake pipeline. The gas outlet of the intake pipeline and the water outlet of the water supply pipeline are respectively communicated with the intake port of the steam compressor to be tested; the inlet of the steam discharge valve and the inlet of the drain valve are respectively communicated with the exhaust pipeline. The outlet of the steam discharge valve is used to discharge steam to the outside, and the outlet of the drain valve is used to drain water to the outside; The drive motor is used to drive the steam compressor to be tested; the thermal power conversion device is used to directly drive the steam compressor to be tested or to drive a generator to generate electricity to provide power for the drive motor.

2. The energy-saving steam compressor test device according to claim 1, characterized in that, A drain liquid level measuring device is provided on the exhaust pipeline.

3. The energy-saving steam compressor test device according to claim 2, characterized in that, A pressure relief safety valve is provided on the exhaust pipeline. The inlet of the pressure relief safety valve is communicated with the exhaust pipeline, and the outlet of the pressure relief safety valve is used to discharge steam to the outside; The exhaust pipeline includes a vertical pipe section; the drain valve and the drain liquid level measuring device are respectively arranged at the lower part of the vertical pipe section, and the steam discharge valve and the pressure relief safety valve are respectively arranged at the upper part of the vertical pipe section.

4. The energy-saving steam compressor test device according to claim 1, characterized in that, The thermal power conversion device is used to directly drive the steam compressor to be tested. The energy-saving steam compressor test device includes a gearbox; the power output shaft of the thermal power conversion device and the output shaft of the drive motor are respectively connected to the first input end and the second input end of the gearbox, and the output end of the gearbox is used to connect the power input shaft of the steam compressor to be tested.

5. The energy-saving steam compressor test device according to claim 1, characterized in that, The intake pressure measuring device and the intake temperature measuring device are respectively an intake pressure transmitter and an intake temperature transmitter; The exhaust pressure measuring device and the exhaust temperature measuring device are respectively an exhaust pressure transmitter and an exhaust temperature transmitter.

6. The energy-saving steam compressor test device according to claim 5, characterized in that, The energy-saving steam compressor test device includes a controller and a drain liquid level measuring device. The drain liquid level measuring device is a drain liquid level transmitter; The signal output terminals of the intake pressure transmitter, the intake temperature transmitter, the exhaust pressure transmitter, the exhaust temperature transmitter, and the drain liquid level transmitter are respectively connected to the input terminals of the controller, and the output terminal of the controller is respectively connected to the control input terminals of the bypass pressure reducing valve, the inlet valve of the thermo-power conversion device, the steam discharge valve, and the drain valve.

7. The energy-saving steam compressor test device according to claim 1 or 4 or 6, characterized in that, The thermo-power conversion device is an expander.

8. The energy-saving steam compressor test device according to claim 1, characterized in that, A water supply valve, a water supply flow detection device, and a water supply pressure detection device are provided on the water supply pipeline.

9. A method for testing a steam compressor using the energy-saving steam compressor test device according to claim 1, characterized in that, It includes the following steps: Open the air suction valve, start the steam compressor to be tested, adjust the opening degree of the bypass pressure reducing valve until the measured intake pressure of the steam compressor is stable at normal pressure and the ratio of the measured exhaust pressure of the steam compressor to the measured intake pressure is within the set pressure ratio range, then close the air suction valve; adjust the opening degree of the steam discharge valve until the measured exhaust pressure of the steam compressor reaches more than 95% of the steam saturation pressure corresponding to the measured exhaust temperature. Adjust the opening degrees of the bypass pressure reducing valve, the inlet valve of the thermo-power conversion device, the steam discharge valve, the water supply valve, and the rotational speed of the steam compressor respectively until the operating conditions of the steam compressor required for the test are simulated.

10. The method for testing a steam compressor using the energy-saving steam compressor test device according to claim 9, characterized in that, During the process of simulating the operating conditions of the steam compressor required for the test, reduce the opening degree of the bypass pressure reducing valve and increase the opening degree of the inlet valve of the thermo-power conversion device.

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