Vapor compressor system and control method

Abstract

The invention discloses a steam compressor system and a control method. The system comprises a steam compressor, a controller, a heat exchange device, and a steam inlet pressure detection device, a steam exhaust pressure detection device and a steam flow detection device which are respectively connected with the controller, the heat exchange device internally comprises a gas phase area and a liquid phase area, and the gas phase area is communicated with a steam inlet of the steam compressor through a steam inlet pipeline; the steam inlet pressure detection device is arranged on the steam inlet pipeline; a heat exchange coil and a heating device are arranged in the liquid phase area; an inlet of the heat exchange coil is communicated with a steam outlet of the steam compressor through a steam exhaust pipeline; the steam exhaust pressure detection device and the steam flow detection device are arranged on the steam exhaust pipeline; an outlet of the heat exchange coil extends to the outside of the heat exchange device; and the controller is respectively connected with the steam compressor and the heating device. According to the steam compressor system provided by the embodiment of the invention, the steam heat can be recycled, so that the energy consumption of the steam compressor test is reduced, and the test cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to a steam compressor system and a control method. Background Art

[0002] With the growing demand for industrial heat and rising energy prices, the utilization of industrial waste heat resources and the issue of industrial carbon emissions are receiving increasing attention. Industrial heat pump technology, which uses clean energy to recover waste heat to replace industrial boilers and meet process heat needs, has emerged. Steam compressors, based on direct steam compression technology, are an important implementation method and are becoming increasingly widely used.

[0003] Given the variability and complexity of heat conditions in industrial scenarios, the steam compressors of compatible ultra-high temperature heat pump systems are often non-standard products, and often require unit design for specific operating conditions. The developed units do not have reference to standard operating condition data and variable operating condition performance tables, making it impossible to formulate accurate and reliable operating strategies. Therefore, it is necessary to perform performance testing on steam compressors. In addition, in addition to R&D test scenarios, steam compressors also need to be tested in scenarios such as operating strategy detection and update, system fault detection, and system maintenance when users are using them normally.

[0004] In related art, steam compressor systems utilize steam generated by a flash tank to feed the compressor and monitor various parameters during operation to test the compressor's performance. However, the flash evaporation method requires a large flow of high-temperature flash water, resulting in a large heat source and high energy consumption. Furthermore, the heat from the compressor exhaust steam is not recycled during testing, leading to high costs for steam compressor performance testing in related art. Summary of the Invention

[0005] The main purpose of this application is to provide a steam compressor system and control method, which aims to solve the technical problem that the heat of the steam discharged from the compressor cannot be recovered and utilized during the steam compressor performance test in the related art, resulting in high cost of the steam compressor performance test in the related art.

[0006] According to one aspect of an embodiment of the present application, there is provided a steam compressor system, comprising a controller, a heat exchange device, and a steam inlet pressure detection device, an exhaust pressure detection device, and a steam flow detection device respectively connected to the controller;

[0007] The interior of the heat exchange device includes a gas phase area and a liquid phase area, and the gas phase area is connected to the steam inlet of the steam compressor through a steam inlet pipeline; the steam inlet pressure detection device is arranged on the steam inlet pipeline; a heat exchange coil and a heating device are arranged in the liquid phase area; the inlet of the heat exchange coil is connected to the steam outlet of the steam compressor through an exhaust pipeline; the exhaust pressure detection device and the steam flow detection device are arranged on the exhaust pipeline; the outlet of the heat exchange coil extends to the outside of the heat exchange device; and the controller is connected to the steam compressor and the heating device respectively.

[0008] In some embodiments of the present application, a first regulating valve connected to the controller is provided on the exhaust pipe.

[0009] In some embodiments of the present application, the system also includes a steam bypass line, a first end of the steam bypass line is connected to the pipeline section between the first regulating valve and the inlet of the heat exchange coil, a second end of the steam bypass line is connected to the atmosphere, and a second regulating valve connected to the controller is provided on the steam bypass line.

[0010] In some embodiments of the present application, the steam compressor system further includes a pressure-stabilizing container, which is disposed on a pipeline section between the first regulating valve and the inlet of the heat exchange coil, the inlet of the pressure-stabilizing container being connected to the steam outlet, and the outlet of the pressure-stabilizing container being connected to the inlet of the heat exchange coil.

[0011] In some embodiments of the present application, a pressure regulating valve connected to the controller is provided on the pipeline section between the outlet of the pressure stabilizing container and the inlet of the heat exchange coil.

[0012] In some embodiments of the present application, the steam compressor system further includes a normal pressure water tank, the outlet of the heat exchange coil is connected to the inlet of the normal pressure water tank through a pipeline, and the normal pressure water tank is connected to the atmosphere.

[0013] In some embodiments of the present application, the steam compressor system also includes a cooling device connected to the controller, and the cooling device is arranged on the pipeline between the heat exchange coil and the atmospheric pressure water tank. The inlet of the cooling device is connected to the outlet of the heat exchange coil through the pipeline, and the outlet of the cooling device is connected to the inlet of the atmospheric pressure water tank through the pipeline.

[0014] In some embodiments of the present application, the inlet of the cooling device is connected to the outlet of the pressure-stabilizing container through a steam bypass line, and a second regulating valve is provided on the steam bypass line, and the second regulating valve is connected to the controller.

[0015] In some embodiments of the present application, the outlet of the pressure-stabilizing container is connected to a pressure-regulating pipeline, the steam bypass pipeline is connected to the pressure-regulating pipeline, the inlet of the heat exchange coil is connected to the pressure-regulating pipeline through a steam heat recovery pipe, a pressure-regulating valve is provided on the pressure-regulating pipeline, and the pressure-regulating valve is connected to the controller.

[0016] In some embodiments of the present application, the atmospheric pressure water tank is connected to the spray device in the steam compressor through a cooling water pipeline, and a cooling water valve and a cooling water pump are provided on the cooling water pipeline, and the cooling water valve and the cooling water pump are respectively connected to the controller.

[0017] In some embodiments of the present application, the atmospheric pressure water tank is connected to the liquid phase region through a water supply pipeline, and a water supply valve and a water supply pump are provided on the water supply pipeline, and the water supply valve and the water supply pump are respectively connected to the controller.

[0018] In some embodiments of the present application, the system further includes a branch line, a first end of the branch line is connected to the exhaust line, a second end of the branch line is connected to the atmosphere, the branch line is connected to the steam inlet line through an anti-surge line, an anti-surge valve is provided on the anti-surge line, and the anti-surge valve is connected to the controller.

[0019] In some embodiments of the present application, a check valve and a drain valve are provided on the branch line, and the check valve and the drain valve are both located on the pipeline section between the anti-surge pipeline and the second end of the branch line, and the check valve and the drain valve are respectively connected to the controller.

[0020] In some embodiments of the present application, a gas-liquid separator is provided on the steam inlet pipeline, the gas-liquid separator is connected to the gas phase region through the steam inlet pipeline, and the gas-liquid separator is connected to the liquid phase region through a pipeline.

[0021] In some embodiments of the present application, a steam inlet temperature detection device connected to the controller is provided on the steam inlet pipeline, an exhaust temperature detection device connected to the controller is provided on the exhaust pipeline, and / or a temperature detection device connected to the controller is provided in the liquid phase region.

[0022] According to another aspect of an embodiment of the present application, a control method for a steam compressor is provided, which is applied to the steam compressor system described in any embodiment of the present application, and the control method includes:

[0023] controlling the heating device to heat the liquid in the liquid phase region to generate steam input into the steam inlet;

[0024] controlling the steam compressor to operate so as to compress the steam and output the compressed steam from the steam outlet;

[0025] obtaining the steam inlet pressure detected by the steam inlet pressure detection device, the exhaust pressure detected by the exhaust pressure detection device, and the steam flow detected by the steam flow detection device;

[0026] Whether the steam compressor meets preset performance requirements is determined based on the steam inlet pressure, the exhaust pressure, and the steam flow rate.

[0027] In some embodiments of the present application, obtaining the inlet steam pressure detected by the inlet steam pressure detection device, the exhaust steam pressure detected by the exhaust steam pressure detection device, and the steam flow detected by the steam flow detection device includes:

[0028] receiving the steam inlet pressure detected by the steam inlet pressure detecting device, and controlling the opening of the second regulating valve according to a first preset interval and the steam inlet pressure to adjust the steam inlet pressure;

[0029] receiving the exhaust steam pressure detected by the exhaust steam pressure detection device, and controlling the opening of the pressure regulating valve according to a second preset interval and the exhaust steam pressure to adjust the exhaust steam pressure;

[0030] When the steam inlet pressure belongs to the first preset range and the exhaust steam pressure belongs to the second preset range, the steam flow rate detected by the steam flow rate detection device is obtained.

[0031] In some embodiments of the present application, an exhaust steam temperature detection device connected to the controller is provided on the exhaust steam pipeline, and the control method further includes:

[0032] obtaining the exhaust steam temperature detected by the exhaust steam temperature detection device;

[0033] controlling the opening of the cooling water valve and the power of the cooling water pump according to a preset temperature range and the exhaust steam temperature to adjust the exhaust steam temperature until the exhaust steam temperature falls within the preset temperature range;

[0034] Whether the steam compressor meets preset performance requirements is determined based on the steam inlet pressure, the exhaust pressure, the steam flow rate, and the exhaust temperature.

[0035] In some embodiments of the present application, the control method further includes:

[0036] According to the steam flow detected by the steam flow detection device and the preset flow range, the operating frequency of the steam compressor is adjusted, and the controller returns to receive the steam inlet pressure detected by the steam inlet pressure detection device, and the process is executed in a loop until the steam flow falls within the preset flow range.

[0037] In the technical solution of the present application, when the steam compressor system is in operation, the compressed steam is input into the heat exchange coil in the liquid phase region. The heat of the steam can be transferred to the liquid in the liquid phase region through the heat exchange coil to promote the evaporation of the liquid, thereby realizing the recovery and utilization of the steam heat, thereby reducing the energy consumption of the steam compressor test and reducing the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0039] Figure 1 This is a schematic structural diagram of a steam compressor system according to an embodiment of the present application;

[0040] Figure 2 This is a schematic structural diagram of a steam compressor system according to an embodiment of the present application;

[0041] Figure 3 This is a schematic diagram of the steam compressor system structure according to one embodiment of the present application;

[0042] Figure 4 This is a flow chart of a method for controlling a steam compressor according to an embodiment of the present application;

[0043] Figure 5 This is a flowchart of step S30 in one embodiment of the present application.

[0044] Description of Figure Numbers:

[0045] 1. Steam compressor; 2. Drive motor; 3. Exhaust pressure detection device; 4. Exhaust temperature detection device; 5. Exhaust pipeline; 6. First regulating valve; 7. Steam flow detection device; 8. Second check valve; 9. Controller; 11. Pressure stabilizing vessel; 12. Inlet steam temperature sensor; 13. Inlet steam pressure detection device; 14. Anti-surge valve; 15. Anti-surge pipeline; 16. First check valve; 17. Drain valve; 18. Branch pipeline; 19. Gas-liquid separator; 20. Heat exchange coil; 21. Pressure regulating valve; 22. Pressure regulating pipeline; 23. Steam trap; 24. Cooling water pump; 25 , cooling water valve; 26, cooling water pipeline; 27, heat exchange device; 28, water supply pipeline; 29, water supply pump; 30, water supply valve; 31, heating device; 32, water supply pipe; 33, water supply valve; 34, liquid temperature detection device; 35, spray device; 36, cooling device; 37, atmospheric pressure water tank; 38, drain pipe; 39, drain valve; 40, return water temperature sensor; 41, pipeline; 42, steam inlet pipeline; 43, second regulating valve; 44, steam bypass pipeline; 46, spray water pump; 47, spray device; 48, gas phase area; 49, liquid phase area; 50, pipeline.

[0046] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, the terms "first," "second," and so on, used in this application are for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0050] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0052] Steam compressors need to be tested in R&D and testing scenarios, as well as in scenarios such as operation strategy detection and update, system fault detection, and system maintenance when users are using the steam compressor normally. In the steam compressor system of the related art, when testing the steam compressor, the steam generated by the flash tank is input into the steam compressor to detect various parameters of the steam compressor during operation to achieve performance testing of the steam compressor. Since the flash tank solution requires high-flow and high-temperature water for the flash water supplied to the flash tank, the heating energy consumption of the flash tank solution is high, and the heat of the steam generated by the compressor exhaust cannot be recovered and reused during the test process, resulting in high costs for steam compressor performance testing in the related art.

[0053] In response to the technical problems existing in the related art, the embodiment of the present application provides a steam compressor system, including a steam compressor, a controller, a heat exchange device, and an inlet pressure detection device, an exhaust pressure detection device and a steam flow detection device respectively connected to the controller; the heat exchange device includes a gas phase region and a liquid phase region, the gas phase region is connected to the steam inlet of the steam compressor through an inlet steam pipeline; the inlet pressure detection device is arranged on the inlet steam pipeline; a heat exchange coil and a heating device are arranged in the liquid phase region; the inlet of the heat exchange coil is connected to the steam outlet of the steam compressor through an exhaust steam pipeline; the exhaust pressure detection device and the steam flow detection device are arranged on the exhaust steam pipeline; the outlet of the heat exchange coil extends to the outside of the heat exchange device; the controller is respectively connected to the steam compressor and the heating device. When the steam compressor system of the embodiment of the present application is in operation, the compressed steam is input into the heat exchange coil in the liquid phase region, and the heat of the steam can be transferred to the liquid in the liquid phase region through the heat exchange coil to promote the evaporation of the liquid, thereby realizing the recovery and utilization of the steam heat, reducing the energy consumption of the steam compressor test and reducing the test cost.

[0054] refer to Figure 1 As shown, an embodiment of the present application provides a steam compressor system, including a steam compressor 1, a controller 9, a heat exchange device 27, and a steam inlet pressure detection device 13, an exhaust pressure detection device 3 and a steam flow detection device 7 respectively connected to the controller 9.

[0055] The heat exchanger 27 comprises a vapor phase region 48 and a liquid phase region 49. The medium in the liquid phase region 49 is liquid, such as liquid water or a solution. The medium in the vapor phase region 48 is gaseous. The vapor phase region 48 is connected to the steam inlet of the steam compressor 1 via the steam inlet line 42. The steam inlet pressure detection device 13 is provided on the steam inlet line 42 to detect the steam inlet pressure of the steam compressor 1. The liquid phase region 49 houses a heat exchange coil 20 and a heating device 31. The inlet of the heat exchange coil 20 is connected to the steam outlet of the steam compressor 1 via the exhaust line 5. The exhaust pressure detection device 3 and the steam flow detection device 7 are provided on the exhaust line 5. The exhaust pressure detection device 3 is used to detect the exhaust pressure of the steam compressor 1, and the steam flow detection device 7 is used to detect the exhaust flow rate within the exhaust line 5. The outlet of the heat exchange coil 20 extends to the exterior of the heat exchanger 27. The controller 9 is connected to the steam compressor 1 and the heating device 31, respectively.

[0056] For example, the heat exchange device 27 may be a double-sided phase-change heat exchanger or a falling-film evaporator. The heating device 31 may be an electric heater, for example, which can be used to heat the liquid in the liquid phase region 49 to generate steam. The inlet steam pressure detection device 13 may be an inlet steam pressure sensor, the exhaust steam pressure detection device 3 may be an exhaust steam pressure sensor, and the steam flow detection device 7 may be a steam flow meter. The controller 9 may be a microprocessor or microcontroller.

[0057] The steam compressor 1 is driven by a drive motor 2 connected to the steam compressor 1. The controller 9 can control the steam compressor 1 to compress steam by controlling the operation of the drive motor 2 connected to the steam compressor 1, and output the compressed steam from the steam outlet of the steam compressor 1.

[0058] When the steam compressor system is in operation, the controller 9 controls the heating device 31 to operate, heating the liquid in the liquid phase region 49 to generate steam. The steam enters the steam compressor 1, where it is compressed and output as compressed steam. The compressed steam is then fed into the heat exchange coil 20 in the liquid phase region 49. The inlet steam pressure detection device 13 detects the pressure of the steam entering the steam compressor 1, the exhaust steam pressure detection device 3 detects the pressure of the compressed steam output from the steam compressor 1, and the steam flow detection device 7 detects the flow rate of the compressed steam. The controller 9 receives data from the inlet steam pressure detection device 13, the exhaust steam pressure detection device 3, and the steam flow detection device 7. Based on the data detected by the inlet steam pressure detection device 13, the exhaust steam pressure detection device 3, and the steam flow detection device 7, it can be determined whether the steam compressor performance meets preset performance requirements. The compressed steam is then fed into the heat exchange coil 20 in the liquid phase region 49. The heat from the steam is transferred to the liquid in the liquid phase region 49 via the heat exchange coil 20, promoting liquid evaporation and thus recovering the steam heat. This reduces energy consumption and testing costs during steam compressor testing.

[0059] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0060] refer to Figure 2 As shown, in some embodiments, the exhaust steam line 5 is provided with a first regulating valve 6 connected to a controller 9. The steam compressor system may further include a steam bypass line 44, a first end of the steam bypass line 44 being connected to the pipeline section between the first regulating valve 6 and the inlet of the heat exchange coil 20, a second end of the steam bypass line 44 being connected to the atmosphere, and a second regulating valve 43 connected to the controller 9 being provided on the steam bypass line 44.

[0061] The steam compressor system may further include a pressure-stabilizing vessel 11, which is disposed on the pipeline section between the first regulating valve 6 and the inlet of the heat exchange coil 20. The inlet of the pressure-stabilizing vessel 11 is connected to the aforementioned steam outlet, and the outlet of the pressure-stabilizing vessel 11 is connected to the inlet of the heat exchange coil 20. A second check valve 8 is disposed on the pipeline between the inlet of the pressure-stabilizing vessel 11 and the steam flow detection device 7, and the second check valve 8 is connected to the controller 9. The pressure-stabilizing vessel 11 can buffer and stabilize the flow of steam discharged from the steam compressor 1 in the exhaust pipeline 5, thereby reducing sudden pressure changes in the pipeline caused by sudden changes in exhaust pressure and improving the operating stability of the steam compressor system.

[0062] A pressure regulating valve 21 connected to the controller 9 may be provided on the pipe section between the outlet of the pressure stabilizing vessel 11 and the inlet of the heat exchange coil 20. A steam trap 23 is provided on the pipe connected to the bottom of the pressure stabilizing vessel 11, and the steam trap 23 is connected to the controller 9.

[0063] The steam compressor system may further include a normal pressure water tank 37 . The outlet of the heat exchange coil 20 is connected to the inlet of the normal pressure water tank 37 through a pipeline, and the normal pressure water tank 37 is connected to the atmosphere.

[0064] The steam compressor system may further include a cooling device 36 connected to the controller 9, wherein the cooling device 36 is arranged on a pipeline between the heat exchange coil 20 and the atmospheric pressure water tank 37, and the inlet of the cooling device 36 is connected to the outlet of the heat exchange coil 20 through a pipeline, and the outlet of the cooling device 36 is connected to the inlet of the atmospheric pressure water tank 37 through a pipeline.

[0065] The inlet of the cooling device 36 is connected to the outlet of the pressure-stabilizing container 11 through a steam bypass line 44 . A second regulating valve 43 is provided on the steam bypass line 44 , and the second regulating valve 43 is connected to the controller 9 .

[0066] The cooling device 36 can be, for example, a cooling tower or a hair dryer. For example, if the cooling device 36 is a hair dryer, the hair dryer blows air to increase the flow rate of air around the pipeline, taking away the heat of the pipeline, thereby cooling the liquid in the pipeline.

[0067] The outlet of the pressure-stabilizing container 11 is connected to a pressure-regulating pipeline 22 , the steam bypass pipeline 44 is connected to the pressure-regulating pipeline 22 , the inlet of the heat exchange coil 20 is connected to the pressure-regulating pipeline 22 through a steam heat recovery pipe, and a pressure-regulating valve 21 is provided on the pressure-regulating pipeline 22 , which is connected to the controller 9 .

[0068] The atmospheric water tank 37 is connected to the spray device 35 in the steam compressor 1 through the cooling water pipeline 26. The cooling water pipeline 26 is provided with a cooling water valve 25 and a cooling water pump 24. The cooling water valve 25 and the cooling water pump 24 are respectively connected to the controller 9. The liquid in the atmospheric water tank 37 can be input into the spray device 35 through the cooling water pipeline 26 by the cooling water pump 24 and sprayed to reduce the temperature inside the steam compressor 1.

[0069] The atmospheric water tank 37 is connected to the liquid phase area 49 through a water supply pipeline 28 . A water supply valve 30 and a water supply pump 29 are provided on the water supply pipeline 28 . The water supply valve 30 and the water supply pump 29 are respectively connected to the controller 9 .

[0070] The steam compressor system may further include a branch line 18, a first end of the branch line 18 being connected to the exhaust line 5, a second end of the branch line 18 being connected to the atmosphere, and the branch line 18 being connected to the steam inlet line 42 via an anti-surge line 15. The anti-surge line 15 is provided with an anti-surge valve 14, which is connected to the controller 9. The anti-surge valve 14 can significantly reduce surge phenomena that occur during operation of the steam compressor 1.

[0071] A first check valve 16 and a drain valve 17 are provided on the branch line 18. The first check valve 16 and the drain valve 17 are both located on the pipeline section between the anti-surge pipeline 15 and the second end of the branch line 18. The first check valve 16 and the drain valve 17 are respectively connected to the controller 9.

[0072] A gas-liquid separator 19 is provided on the steam inlet line 42. The gas-liquid separator 19 is connected to the gas phase region 48 via the steam inlet line 42, and is connected to the liquid phase region 49 via a line 50. Specifically, the gas-liquid separator 19 is divided into a gas phase region and a liquid phase region. The gas phase region of the gas-liquid separator 19 is connected to the gas phase region 48 of the heat exchanger 27 via the steam inlet line 42, and the liquid phase region of the gas-liquid separator 19 is connected to the liquid phase region 49 of the heat exchanger 27 via a line 50. Steam in the gas phase region 48 of the heat exchanger 27 is input into the steam inlet of the steam compressor 1 via the steam inlet line 42. During this process, the steam flows through the gas phase region of the gas-liquid separator 19, generating some condensed liquid in the gas phase region of the gas-liquid separator 19. This condensed liquid flows into the liquid phase region of the gas-liquid separator 19, and the liquid in the liquid phase region of the gas-liquid separator 19 is input into the liquid phase region 49 of the heat exchanger 27 via a line 50. In this way, the condensed liquid can be recycled and waste can be reduced.

[0073] The inlet steam line 42 is provided with an inlet steam temperature detection device 12 connected to the controller 9, the exhaust steam line 5 is provided with an exhaust steam temperature detection device 4 connected to the controller 9, and / or the liquid phase region 49 is provided with a liquid temperature detection device 34 connected to the controller 9. The inlet steam temperature detection device 12, the exhaust steam temperature detection device 4, and the liquid temperature detection device 34 can all be temperature sensors.

[0074] A water supply pipe 32 is connected to the bottom of the heat exchanger 27 housing. A water supply valve 33 is installed on this pipe and is connected to the controller 9. Opening this valve allows liquid to be introduced from outside the heat exchanger 27 through the water supply pipe 32 into the liquid phase region 49. A drain pipe 38 is connected to the bottom of the atmospheric pressure water tank 37. This drain valve 39 is installed on this pipe and is connected to the controller 9. Once this valve is opened, the liquid in the atmospheric pressure water tank 37 can be drained from this pipe.

[0075] A return water temperature detection device 40 connected to the controller 9 is provided on the pipeline 41 connecting the cooling device 36 and the atmospheric pressure water tank 37. The return water temperature detection device 40 may be, for example, a temperature sensor.

[0076] Exemplarily, the controller 9 includes an information acquisition module, a computing module, and an execution module. The exhaust pressure detection device 3, the exhaust temperature detection device 4, the steam flow detection device 7, the liquid temperature detection device 34, the return water temperature detection device 40, the inlet temperature detection device 12, and the inlet pressure detection device 13 are connected to the information acquisition module of the controller 9 via signal lines. The regulating valve 6, the drain valve 17, the pressure regulating valve 21, the anti-surge valve 14, the cooling device 36, the water supply valve 30, the water supply pump 29, the cooling water pump 24, and the cooling water valve 25 are connected to the execution module of the controller 9 via signal lines.

[0077] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0078] like Figure 3 As shown, in one embodiment, the heat exchange device 27 is a falling film evaporator. A connecting pipe is provided on the exterior of the housing of the heat exchange device 27. The lower end of the connecting pipe is connected to the liquid phase region 49, and the upper end of the connecting pipe extends into the vapor phase region 48 within the housing. The connecting pipe is provided with a spray water pump 46 connected to the controller 9. A spray device 47 is provided on the section of the connecting pipe located in the vapor phase region 48. The spray device 47 can be, for example, a nozzle. The controller 9 can control the spray water pump 46 to input the liquid in the liquid phase region 49 into the spray device 47 through the connecting pipe, and the spray device 47 sprays the liquid.

[0079] Within the falling film evaporator, water from the liquid phase region of heat exchanger 27 is continuously circulated to the top of the vapor phase region of heat exchanger 27 for spraying, thereby enhancing the heat exchange effect inside and outside the heat exchange coil 20. The low-temperature, low-pressure steam generated by the falling film evaporator is near saturation and has a low degree of superheat, which is more conducive to controlling the inlet temperature and pressure of steam compressor 1.

[0080] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0081] A specific example provides a steam compressor system, including a controller 9, a pressure stabilizing container 11, a first regulating valve 6, a double-sided phase change heat exchange tank, a gas-liquid separator 19, a cooling device 36, a normal pressure water tank 37, and an inlet steam pressure sensor, an exhaust steam pressure sensor and a steam flow meter respectively connected to the controller 9.

[0082] The double-sided phase-change heat exchanger includes a vapor region 48 and a liquid region 49. The vapor region 48 is connected to the steam inlet of the steam compressor 1 via a steam inlet line 42. The medium in the liquid region 49 is liquid water, while the medium in the vapor region 48 is gaseous. An inlet steam pressure sensor is located on the steam inlet line 42.

[0083] The liquid phase region is provided with a heat exchange coil 20 and an electric heater. The inlet of the heat exchange coil 20 is connected to the steam outlet of the steam compressor 1 through the exhaust pipe 5. An exhaust pressure sensor and a steam flow meter are provided on the exhaust pipe 5.

[0084] The exhaust steam line 5 is provided with a first regulating valve 6 connected to a controller 9. The steam compressor system also includes a steam bypass line 44. A first end of the steam bypass line 44 is connected to the pipeline section between the first regulating valve 6 and the inlet of the heat exchange coil 20. A second end of the steam bypass line 44 is connected to the atmosphere. A second regulating valve 43 connected to the controller 9 is provided on the steam bypass line 44.

[0085] A pressure-stabilizing vessel 11 is installed in the pipeline section between the first regulating valve 6 and the inlet of the heat exchange coil 20. The inlet of the pressure-stabilizing vessel 11 is connected to the aforementioned steam outlet, and the outlet of the pressure-stabilizing vessel 11 is connected to the inlet of the heat exchange coil 20. A second check valve 8 is installed in the pipeline between the inlet of the pressure-stabilizing vessel 11 and the steam flowmeter. The second check valve 8 is connected to the controller 9.

[0086] A pressure regulating valve 21 connected to the controller 9 may be provided on the pipe section between the outlet of the pressure stabilizing vessel 11 and the inlet of the heat exchange coil 20. A steam trap 23 is provided on the pipe connected to the bottom of the pressure stabilizing vessel 11, and the steam trap 23 is connected to the controller 9.

[0087] The outlet of the heat exchange coil 20 is connected to the inlet of the atmospheric pressure water tank 37 through a pipeline, and the atmospheric pressure water tank 37 is connected to the atmosphere.

[0088] The cooling device 36 is arranged on the pipeline between the heat exchange coil 20 and the atmospheric pressure water tank 37. The inlet of the cooling device 36 is connected to the outlet of the heat exchange coil 20 through the pipeline, and the outlet of the cooling device 36 is connected to the inlet of the atmospheric pressure water tank 37 through the pipeline.

[0089] The inlet of the cooling device 36 is connected to the outlet of the pressure-stabilizing container 11 through a steam bypass line 44 . A second regulating valve 43 is provided on the steam bypass line 44 , and the second regulating valve 43 is connected to the controller 9 .

[0090] Taking the cooling device 36 as an example, the hair dryer blows air to promote the flow speed of the air around the pipeline, take away the heat of the pipeline, and thus cool the liquid in the pipeline.

[0091] The outlet of the pressure-stabilizing container 11 is connected to a pressure-regulating pipeline 22 , the steam bypass pipeline 44 is connected to the pressure-regulating pipeline 22 , the inlet of the heat exchange coil 20 is connected to the pressure-regulating pipeline 22 through a steam heat recovery pipe, and a pressure-regulating valve 21 is provided on the pressure-regulating pipeline 22 , which is connected to the controller 9 .

[0092] The atmospheric water tank 37 is connected to the spray device in the steam compressor 1 through the cooling water pipeline 26. A cooling water valve 25 and a cooling water pump 24 are provided on the cooling water pipeline 26. The cooling water valve 25 and the cooling water pump 24 are respectively connected to the controller 9.

[0093] The atmospheric water tank 37 is connected to the liquid phase area 49 through a water supply pipeline 28 . A water supply valve 30 and a water supply pump 29 are provided on the water supply pipeline 28 . The water supply valve 30 and the water supply pump 29 are respectively connected to the controller 9 .

[0094] The steam compressor system also includes a branch line 18, a first end of the branch line 18 is connected to the exhaust line 5, a second end of the branch line 18 is connected to the atmosphere, the branch line 18 is connected to the steam inlet line 42 through an anti-surge line 15, an anti-surge valve 14 is provided on the anti-surge line 15, and the anti-surge valve 14 is connected to the controller 9.

[0095] A first check valve 16 and a drain valve 17 are provided on the branch line 18. The first check valve 16 and the drain valve 17 are both located on the pipeline section between the anti-surge pipeline 15 and the second end of the branch line 18. The first check valve 16 and the drain valve 17 are respectively connected to the controller 9.

[0096] A gas-liquid separator 19 is provided on the steam inlet line 42. The gas-liquid separator 19 is connected to the gas phase region 48 via the steam inlet line 42, and is connected to the liquid phase region 49 via a line 50. Specifically, the gas-liquid separator 19 is divided into a gas phase region and a liquid phase region. The gas phase region of the gas-liquid separator 19 is connected to the gas phase region 48 of the heat exchanger 27 via the steam inlet line 42, and the liquid phase region of the gas-liquid separator 19 is connected to the liquid phase region 49 of the heat exchanger 27 via a line 50. Steam in the gas phase region 48 of the heat exchanger 27 is input into the steam inlet of the steam compressor 1 via the steam inlet line 42. During this process, the steam flows through the gas phase region of the gas-liquid separator 19, generating some condensed liquid in the gas phase region of the gas-liquid separator 19. This condensed liquid flows into the liquid phase region of the gas-liquid separator 19, and the liquid in the liquid phase region of the gas-liquid separator 19 is input into the liquid phase region 49 of the heat exchanger 27 via a line 50. In this way, the condensed liquid can be recycled and waste can be reduced.

[0097] An inlet steam temperature sensor connected to the controller 9 is provided on the steam inlet pipeline 42 , an exhaust steam temperature sensor connected to the controller 9 is provided on the exhaust steam pipeline 5 , and a liquid temperature sensor connected to the controller 9 is provided in the liquid phase region 49 .

[0098] The bottom of the heat exchanger 27 housing is connected to a water supply pipe 32, which is equipped with a water supply valve 33. This water supply valve 33 is connected to the controller 9. A drain pipe 38 is connected to the bottom of the atmospheric pressure water tank 37. This drain pipe 38 is equipped with a drain valve 39, which is connected to the controller 9. When drain valve 39 is opened, drain pipe 38 can drain the liquid from the atmospheric pressure water tank 37.

[0099] A return water temperature sensor connected to the controller 9 is provided on the pipe 41 connecting the cooling device 36 and the atmospheric pressure water tank 37 .

[0100] Controller 9 includes an information acquisition module, a calculation module, and an execution module. The exhaust pressure sensor, exhaust temperature sensor, steam flowmeter, liquid temperature sensor, return water temperature sensor, inlet temperature sensor, and inlet pressure sensor are each connected to the information acquisition module of controller 9 via signal lines. The regulating valve 6, drain valve 17, pressure regulating valve 21, anti-surge valve 14, cooling device 36, water supply valve 30, water supply pump 29, cooling water pump 24, and cooling water valve 25 are each connected to the execution module of controller 9 via signal lines.

[0101] The pipelines in the steam compressor system of this example include steam pipelines for steam circulation and water pipelines for water circulation. The various valves in this steam compressor system are used to regulate, open and close, drain, replenish water, or check the pipelines. The various sensors in the steam compressor system of this example are used to detect parameter data of their respective parts, so that the controller can adjust and control the steam compressor system based on the detected parameter data.

[0102] The steam compressor system of the embodiment of the present application can use real water vapor medium to test the performance of the steam compressor, thereby improving the accuracy and stability of the steam compressor operating condition test; in the steam compressor system, the cooled water working medium can be used to recover most of the latent heat of the steam compressor exhaust steam, and a small part of the latent heat and all the sensible heat of the exhaust steam are then dissipated out of the system through the cooling device, thereby realizing the recycling of heat inside the steam compressor system; the cooled water working medium is discharged into the atmospheric pressure water tank and recycled into the heat exchange device to absorb heat through phase change to generate low-pressure steam, thereby realizing the recycling of the medium inside the steam compressor system, thereby greatly reducing the investment in equipment and operating energy consumption.

[0103] Another embodiment of the present application provides a steam compressor control method, which is applied to the steam compressor system of any embodiment of the present application; the control method of the embodiment of the present application can be applied to steam compressor R&D and testing scenarios, and can also be applied to test steam compressors in scenarios such as operation strategy detection and update, system fault detection, and system maintenance when users are using the steam compressor normally. Figure 4As shown, the control method may include steps S10 to S40:

[0104] S10 , controlling the heating device 31 to heat the liquid in the liquid phase region 49 to generate steam that is input to the steam inlet.

[0105] Specifically, during the test of the steam compressor, the controller 9 can control the operation of the heating device 31 and the heating power of the heating device 31 to heat the liquid in the liquid phase region 49 and generate steam to be input into the steam inlet of the steam compressor 1. The heating device 31 can be an electric heater, and the controller 9 heats the liquid in the liquid phase region by controlling the heating power of the electric heater.

[0106] S20 , controlling the steam compressor 1 to operate to compress steam, and outputting the compressed steam from the steam outlet.

[0107] Specifically, the controller 9 may control the steam compressor 1 to compress steam by controlling the operation of the driving motor 2 connected to the steam compressor 1 , and output the compressed steam from the steam outlet.

[0108] S30 , obtaining the steam inlet pressure detected by the steam inlet pressure detection device 13 , the exhaust pressure detected by the exhaust pressure detection device 3 , and the steam flow detected by the steam flow detection device 7 .

[0109] For example, refer to Figure 5 As shown, obtaining the inlet steam pressure detected by the inlet steam pressure detection device 13, the exhaust steam pressure detected by the exhaust steam pressure detection device 3, and the steam flow detected by the steam flow detection device 7 may include steps S301 to S303:

[0110] S301 , receiving the steam intake pressure detected by the steam intake pressure detection device 13 , and controlling the opening of the second regulating valve 43 according to the first preset interval and the steam intake pressure to adjust the steam intake pressure.

[0111] Specifically, when the received steam inlet pressure is greater than the right endpoint value of the first preset interval, it means that the steam inlet pressure is too high. The second regulating valve 43 can be controlled to reduce the opening to reduce the steam flowing into the steam bypass line 44, thereby increasing the steam flowing into the steam coil 20; after the steam flowing into the steam coil 20 increases, the heating efficiency of the liquid in the liquid phase area 49 is improved, the evaporation of the liquid in the liquid phase area 49 is accelerated, and the steam input to the steam inlet line 42 increases, thereby reducing the steam inlet pressure input to the steam compressor 1.

[0112] When the received steam inlet pressure is less than the left endpoint value of the first preset interval, it means that the steam inlet pressure is too low. The second regulating valve 43 can be controlled to increase its opening to increase the steam flowing into the steam bypass line 44, thereby reducing the steam flowing into the steam coil 20. After the steam flowing into the steam coil 20 is reduced, the heating efficiency of the liquid in the liquid phase area 49 is reduced, the evaporation of the liquid in the liquid phase area 49 is slowed down, and the steam input to the steam inlet line 42 is reduced, thereby increasing the steam inlet pressure input to the steam compressor 1.

[0113] S302 , receiving the exhaust steam pressure detected by the exhaust steam pressure detection device 3 , and controlling the opening of the pressure regulating valve 21 according to the second preset interval and the exhaust steam pressure to adjust the exhaust steam pressure.

[0114] Specifically, when the received exhaust steam pressure is greater than the right endpoint value of the second preset interval, it indicates that the exhaust steam pressure is too high. The pressure regulating valve 21 can be controlled to increase its opening to increase the steam flow rate of the exhaust steam pipeline 5, thereby reducing the exhaust steam pressure. When the received exhaust steam pressure is less than the left endpoint value of the second preset interval, it indicates that the exhaust steam pressure is too low. The pressure regulating valve 21 can be controlled to decrease its opening to reduce the steam flow rate of the exhaust steam pipeline 5, thereby increasing the exhaust steam pressure.

[0115] S303 . When the steam inlet pressure is within the first preset range and the exhaust pressure is within the second preset range, obtain the steam flow rate detected by the steam flow rate detection device 7 .

[0116] Specifically, the inlet steam pressure detection device 13, the exhaust steam pressure detection device 3, and the steam flow rate detection device 7 are each connected to a controller 9. The controller 9 receives the inlet steam pressure detected by the inlet steam pressure detection device 13, the exhaust steam pressure detected by the exhaust steam pressure detection device 3, and the steam flow rate detected by the steam flow rate detection device 7. If the inlet steam pressure falls within the first preset range and the exhaust steam pressure falls within the second preset range, the test condition is met, and the controller 9 receives the steam flow rate detected by the steam flow rate detection device 7. Both the first and second preset ranges are preset based on actual test needs.

[0117] S40: Determine whether the steam compressor 1 meets preset performance requirements based on the steam inlet pressure, the exhaust pressure, and the steam flow rate.

[0118] The preset performance requirement is a pre-set performance requirement for the steam compressor. For example, the preset performance requirement can be a preset correspondence requirement between the inlet steam pressure, exhaust steam pressure, and steam flow rate. For example, the preset correspondence requirement can be: when the inlet steam pressure ranges from a to b and the exhaust steam pressure ranges from c to d, the corresponding steam flow rate ranges from e to f. The preset performance requirement can also be other correspondences between the inlet steam pressure, exhaust steam pressure, and steam flow rate, and can be set according to actual needs.

[0119] The steam inlet pressure, exhaust pressure and steam flow obtained by the controller are compared with the preset corresponding relationship requirements. If the steam inlet pressure, exhaust pressure and steam flow obtained by the controller meet the aforementioned preset corresponding relationship requirements, it is determined that the performance of the steam compressor 1 meets the preset performance requirements; otherwise, it is determined that the performance of the steam compressor 1 does not meet the preset performance requirements.

[0120] In some embodiments, an exhaust steam temperature detection device connected to the controller 9 is provided on the exhaust steam pipeline 5. The control method may further include:

[0121] Obtain the exhaust temperature detected by the exhaust temperature detection device; control the cooling water valve opening and the cooling water pump power according to the preset temperature range and the exhaust temperature to adjust the exhaust temperature until the exhaust temperature falls within the preset temperature range; determine whether the steam compressor 1 meets the preset performance requirements based on the inlet steam pressure, exhaust steam pressure, steam flow rate and exhaust steam temperature.

[0122] Specifically, the preset performance requirements may include preset correspondence requirements between the inlet steam pressure, the exhaust steam pressure, the exhaust steam temperature, and the steam flow rate. For example, the preset correspondence requirement may be: when the inlet steam pressure ranges from A to B, the exhaust steam pressure ranges from C to D, and the exhaust steam temperature ranges from E to F, the corresponding steam flow rate ranges from G to H. If the inlet steam pressure, the exhaust steam pressure, the steam flow rate, and the exhaust steam temperature meet the aforementioned preset correspondence requirements, it is determined that the steam compressor 1 meets the preset performance requirements; otherwise, it is determined that the steam compressor 1 does not meet the preset performance requirements.

[0123] The preset performance requirements may also be other corresponding relationships among the inlet steam pressure, exhaust steam pressure, exhaust steam temperature and steam flow rate, which may be specifically set according to the needs of actual application.

[0124] In some embodiments, the control method may further include:

[0125] The operating frequency of the steam compressor 1 is adjusted based on the steam flow rate detected by the steam flow detection device 7 and the preset flow rate range. The controller 9 then returns to receive the steam inlet pressure detected by the steam inlet pressure detection device 13, and the process repeats until the steam flow rate falls within the preset flow rate range. This allows the corresponding relationship between the operating frequency of the steam compressor 1 and the steam flow rate to be determined, thereby also using the operating frequency of the steam compressor 1 as an indicator for evaluating the performance of the steam compressor 1.

[0126] Specifically, when the steam flow rate detected by the steam flow detection device 7 is greater than the right endpoint value of the preset flow range, the operating frequency of the steam compressor 1 is reduced, and then the controller 9 is returned to receive the steam inlet pressure detected by the steam inlet pressure detection device 13, and the steps are executed in a loop until the steam flow rate falls within the preset flow range; when the steam flow rate detected by the steam flow detection device 7 is less than the left endpoint value of the preset flow range, the operating frequency of the steam compressor 1 is increased, and then the controller 9 is returned to receive the steam inlet pressure detected by the steam inlet pressure detection device 13, and the steps are executed in a loop until the steam flow rate falls within the preset flow range. In this way, the corresponding relationship between the operating frequency of the steam compressor 1 and the steam flow rate can be obtained, so that the operating frequency of the steam compressor 1 can also be used as one of the indicators for evaluating the performance of the steam compressor 1, so as to facilitate the judgment of the performance of the steam compressor 1.

[0127] The steam compressor 1 is driven by the driving motor 2 , so the operating frequency of the steam compressor 1 can be adjusted by adjusting the operating frequency of the driving motor 2 .

[0128] In a specific example, in order to achieve a better test effect of the steam compressor system, in this specific example, the components in the steam compressor system can be set to satisfy the following corresponding relationship:

[0129] Design capacity Q of cooling device 36 cool,design Equal to the maximum power PI of driving motor 2 max :Q cool,design =PI max ;

[0130] The designed heat transfer capacity Q of the heat exchange device 27 ds,design The following relationship is satisfied:

[0131] Q ds,design =(h ex G ex -PI) max ;

[0132] Among them, h ex Indicates the outlet enthalpy of steam compressor 1, G ex represents the outlet mass flow of steam compressor 1, and PI represents the input power of steam compressor 1.

[0133] In a specific example, a method for controlling a steam compressor may include:

[0134] Steam compressor 1 compresses the low-pressure steam it draws in and then discharges the compressed steam. This compressed steam is then fed into exhaust pipe 5, flows sequentially through first regulating valve 6, steam flowmeter 7, and second check valve 8, and enters pressure-stabilizing vessel 11. The high-pressure steam in pressure-stabilizing vessel 11 is pressure-regulated in pressure-regulating pipe 22 by pressure-regulating valve 21, and then splits into two paths. One path enters heat exchange coil 20 in double-sided phase-change heat exchange tank 27. Within heat exchange coil 20, the high-temperature exhaust steam condenses into a liquid or gas-liquid two-phase state, releasing heat to the liquid in the liquid phase before flowing into cooling device 36 through a pipe connected to the outlet of heat exchange coil 20. The other path enters steam bypass pipe 44, passes through second regulating valve 43, and enters cooling device 36.

[0135] In the cooling device 36, after the liquid or gas-liquid two-phase working medium is cooled to the set temperature, it flows into the atmospheric pressure water tank 37 through the pipeline 41. After flowing out of the atmospheric pressure water tank 37, the working medium is divided into two paths. One path passes through the water supply pipeline 28 and flows into the heat exchange device 27 under the regulation of the water supply pump 29 and the water supply valve 30; in the shell of the heat exchange device 27, under the action of the steam inlet of the steam compressor 1 and the heating of the heat exchange coil 20, the pressure in the gas phase region is relatively low, and the liquid is easy to boil. The low-temperature and low-pressure steam generated by the evaporation of the liquid is input into the steam compressor 1 through the steam inlet pipeline 42; the other path of working medium enters the spray device 35 in the steam compressor 1 through the cooling water pipeline 26 under the action of the cooling water pump 24 and the cooling water valve 25, and is sprayed into the interior of the steam compressor 1 for cooling, thereby realizing the heat and mass circulation of the entire steam compressor system.

[0136] In another specific example, the control method of the steam compressor is applied to Figure 2 For the steam compressor system shown in FIG. 1 , the control method of this example may include steps 1 to 3:

[0137] Step 1: Start the steam compressor system:

[0138] When the steam compressor system is started, the first regulating valve 6, the second regulating valve 43, the drain valve 38, the water supply valve 30, the cooling water valve 25, the anti-surge valve 14, the water supply pump 29, and the cooling water pump 24 are closed. The drain valve 17 and the water supply valve 33 are opened, and external water is injected into the double-sided phase change heat exchange tank 27 through the water supply pipe 32 until the preset liquid level is reached.

[0139] The heating device 31 in the heat exchange device 27 is turned on to heat the water working medium in the heat exchange device 27 until it boils. The generated steam flows through the gas-liquid separator 19 via the steam inlet pipe 42 and is input into the steam compressor 1. The controller 9 receives detection data from the steam inlet temperature detection device 12 and the steam inlet pressure detection device 13 until the detection data of the steam inlet temperature detection device 12 and the steam inlet pressure detection device 13 reach a first stable state, and then the steam compressor 1 is turned on. The steam compressor 1 compresses the input steam, and the compressed steam is output from the steam outlet and enters the branch pipe 18 connected to the exhaust pipe 5, and the branch pipe 18 is emptied.

[0140] Adjust the steam inlet pressure of the steam compressor 1 to the set rated operating pressure. When the detection data of the steam inlet temperature detection device 12 and the steam inlet pressure detection device 13 reach the second stable state, close the exhaust valve 17 and open the first regulating valve 6 to allow steam to enter the heat exchange coil 20 through the exhaust pipe 5.

[0141] The method for controlling the steam inlet pressure of the steam compressor 1 during the startup phase includes: assuming that the steam inlet pressure of the steam compressor 1 under rated working conditions is P' s , the temperature measured by the liquid temperature detection device 34 is T g The calculation module of the controller 9 is used to calculate the steam saturation temperature T' corresponding to the rated steam inlet pressure. s , that is, T′ s =f(P ′ s );

[0142] For example, the corresponding relationship function between water vapor saturation pressure and saturation temperature is shown as follows:

[0143] T s ′ =45.47+3826.36 / [9.3876-ln(P s ′ )]

[0144] Among them, T s ′ The value range can be 290~500K.

[0145] Contrast T g and T′ s , ΔT s =T g -T′ s , when ΔT s Greater than the preset threshold ΔT s1 When ΔT s Less than the preset threshold ΔTs1 , greater than the preset threshold ΔT s2 When ΔT s Less than the preset threshold ΔT s2 When , it indicates that the actual temperature of the liquid in the current liquid phase region is too high, the execution module is used to increase the power of the heating device 31 to increase the temperature of the liquid in the liquid phase region.

[0146] Adjust the exhaust pressure of steam compressor 1 to the set rated operating pressure.

[0147] The exhaust pressure control method of the steam compressor 1 includes: assuming that the exhaust pressure of the steam compressor 1 under rated working conditions is P' e The pressure value measured by the exhaust pressure detection device 3 is P e ; Compare P′ e With P e , ΔP e =P e -P′ e , when ΔP e When it is greater than the preset threshold value ΔP1, it indicates that the current actual exhaust pressure is too high and needs to be reduced. Then, the execution module is used to increase the opening of the pressure regulating valve 21 to increase the steam flow rate flowing into the steam bypass line 44, thereby reducing the steam flow rate flowing into the heating coil 20, reducing the heating efficiency of the liquid in the liquid phase region, reducing liquid evaporation, thereby reducing the steam flow rate input to the steam compressor 1 and reducing the exhaust pressure of the steam compressor 1; when ΔP e When the pressure is less than the preset threshold value ΔP1 and greater than the preset threshold value ΔP2, the opening of the pressure regulating valve 21 is kept unchanged; when ΔP e When it is less than the preset threshold value ΔP2, it indicates that the current actual exhaust pressure is too low and the actual exhaust pressure needs to be increased. The execution module is used to reduce the opening of the pressure regulating valve 21 to reduce the steam flow rate flowing into the steam bypass line 44, thereby increasing the steam flow rate flowing into the heating coil 20, improving the heating efficiency of the liquid in the liquid phase region, increasing liquid evaporation, thereby increasing the steam flow rate input to the steam compressor 1, and increasing the exhaust pressure of the steam compressor 1.

[0148] Close the water supply valve 33 and adjust the return water temperature to the set value.

[0149] The method for controlling the return water temperature includes: detecting the data T of the return water temperature detection device 40 r Assume that the return water temperature is set to T' r (T′ r <T′ s ), compared with T′ r With T r , ΔT r =T r -T′r , when ΔT r Greater than the preset threshold ΔT r1 When ΔT is reached, it indicates that the temperature of the liquid after cooling by the cooling device 36 is too high. Then, the execution module is used to increase the operating efficiency of the cooling device 36, further increasing the temperature reduction amplitude of the liquid flowing into the cooling device 36. In this way, the temperature of the liquid after cooling by the cooling device 36 can be further reduced. When ΔT r Less than the preset threshold ΔT r1 , greater than the preset threshold ΔT r2 When ΔT s Less than the preset threshold ΔT s2 When the temperature of the liquid after cooling by the cooling device 36 is too low, the execution module is used to reduce the operating efficiency of the cooling device 36 to avoid the temperature of the liquid flowing into the cooling device 36 from being reduced too much.

[0150] The heating device 31 is turned off, the water supply valve 30 is opened, and the steam from the heat exchange coil 20 is used to heat the liquid working medium in the heat exchange device 27 .

[0151] The steam inlet pressure control method of the steam compressor in the operation stage includes: assuming that the steam inlet pressure of the steam compressor 1 under rated working conditions is P' s The pressure measured by the steam inlet pressure detection device 13 is P s . Comparison of the calculation module of controller 9 with P s and P′ s , ΔP s =P s -P′ s , when ΔP s Greater than the preset threshold ΔP s1 When ΔP is reached, it indicates that the actual steam inlet pressure is too high and needs to be reduced. The execution module is used to increase the opening of the second regulating valve 43, increase the steam flow rate of the input steam bypass line 44, thereby reducing the steam flow rate of the input heat exchange coil 20, reducing the heating efficiency of the liquid in the liquid phase area 49, reducing the steam velocity in the input steam inlet pipe 42, and reducing the steam inlet pressure. When ΔP s Less than the preset threshold ΔP s1 , greater than the preset threshold ΔP s2 When the actual steam inlet pressure is within the preset range, the opening of the second regulating valve 43 remains unchanged; when ΔP s Less than the preset threshold ΔP s2When the actual steam inlet pressure is too low, it means that the actual steam inlet pressure needs to be increased. The execution module is used to reduce the opening of the second regulating valve 43, reduce the steam flow of the input steam bypass line 44, thereby increasing the steam flow of the input heat exchange coil 20, increasing the heating efficiency of the liquid in the liquid phase area 49, increasing the steam velocity in the input steam inlet pipe 42, and increasing the steam inlet pressure.

[0152] The cooling water pump 24 and the cooling water valve 25 are turned on to adjust the exhaust temperature of the steam compressor 1 .

[0153] The exhaust temperature control method of the steam compressor 1 includes: assuming that the exhaust temperature of the compressor under rated working conditions is T' e The temperature value measured by the exhaust temperature detection device 4 is T e ; Compare T′ e With T e , ΔT e =T e -T′ e , when ΔT e Greater than the preset threshold ΔT e1 When ΔT is reached, it indicates that the actual exhaust temperature is too high and needs to be lowered. The execution module is used to increase the opening of the cooling water valve 25. The liquid flow rate input to the spraying device 35 through the cooling pipe 26 increases, thereby increasing the cooling efficiency inside the steam compressor 1. e Less than the preset threshold ΔT e1 , greater than the preset threshold ΔT e2 When ΔT e Less than the preset threshold ΔT e2 When the actual exhaust temperature is too low, it means that the actual exhaust temperature needs to be increased. The execution module is used to reduce the opening of the cooling water valve 25, and the liquid flow input to the spraying device 35 through the cooling pipe 26 is reduced, which reduces the cooling efficiency inside the steam compressor 1, thereby increasing the temperature inside the steam compressor 1.

[0154] Through the above control, the steam compressor 1 is finally operated in a stable rated operating state and the startup is completed. At this time, the flow of the steam compressor 1 under the rated operating condition can be measured by the steam flow detection device 7 to test the performance of the steam compressor 1.

[0155] Step 2: Test under variable operating conditions:

[0156] Step 2.1: Performance test of steam compressor 1 under different pressure ratio conditions:

[0157] Step 2.1.1: Adjust the return water temperature of the double-sided phase-change heat exchange tank 27 according to the return water temperature control method in step 1, so that T r <T′ s ;

[0158] Step 2.1.2: Adjust the steam inlet pressure P′ of the steam compressor 1 according to the steam inlet pressure control method of the steam compressor 1 during the operation phase in step 1. s ; Steam compressor inlet steam pressure P' s , exhaust steam pressure P′ e and exhaust steam temperature T′ e All are pre-set;

[0159] Step 2.1.3: Adjust the exhaust pressure P′ of the steam compressor 1 according to the exhaust pressure control method of the steam compressor 1 in step 1. e ;

[0160] Step 2.1.4: Adjust the exhaust temperature T' of the steam compressor 1 according to the exhaust temperature control method of the steam compressor 1 in step 1. e ;

[0161] Repeat steps 2.1.1 to 2.1.4 until the operating condition of the steam compressor 1 reaches stability. At this time, the value of the steam flow detection device 7 is collected, which is the current steam flow value of the steam compressor 1.

[0162] Step 2.2: Capacity adjustment range test under the same pressure ratio conditions:

[0163] Step 2.2.1: Adjust the return water temperature of the double-sided phase-change heat exchange tank 27 according to the return water temperature control method in step 1, so that T r <T′ s ;

[0164] Step 2.2.2: Adjust the steam inlet pressure of the compressor according to the steam inlet pressure control method of the compressor in the operation stage 1; the steam inlet pressure P′ of the steam compressor s , exhaust steam pressure P' e , exhaust steam temperature T′ e And the flow value G′ c All are pre-set;

[0165] Step 2.2.3, adjusting the exhaust steam pressure of the compressor according to the exhaust steam pressure control method of the compressor in 1;

[0166] Step 2.2.4, adjusting the exhaust temperature of the compressor according to the exhaust temperature control method of the compressor in 1;

[0167] Step 2.2.5, repeat steps 2.2.1 to 2.2.4 until the compressor operating conditions reach a stable state. At this time, the value of the steam flow detection device 7 is collected, which is the current flow value of the compressor;

[0168] Adjust the frequency of the compressor motor and repeat steps 2.2.1 to 2.2.5. The controller 9 collects the flow value G of the steam compressor 1 at this time through the steam flow detection device 7. c , compared with G c and G′ c , ΔG=G c -G′ c , when ΔG is greater than the preset threshold ΔG c1 When ΔG is less than the preset threshold value ΔG, it indicates that the current actual steam flow value is too large and needs to be reduced. The execution module is used to reduce the frequency of the drive motor 2, thereby reducing the steam flow value discharged into the exhaust pipe 5. c1 , greater than the preset threshold ΔG c2 When the current actual steam flow value belongs to the preset steam flow range, the frequency of the drive motor 2 is kept unchanged; when ΔG is less than the preset threshold ΔG c2 When , it indicates that the current actual steam flow value is too small and needs to be increased. The execution module is used to increase the frequency of the drive motor 2, thereby increasing the steam flow value discharged into the exhaust pipe 5.

[0169] When the value of the exhaust pressure detection device 3 fluctuates violently under given suction and exhaust pressures and flow rates, the control valve 6 is closed and the anti-surge valve 14 is opened through the execution module of the controller 9. After the reading of the exhaust pressure detection device 3 stabilizes, the steam compressor 1 is shut down.

[0170] When, under a given suction and exhaust pressure, the flow rate of the steam flow meter 3 no longer changes regardless of how the frequency of the motor 2 is increased, the execution module of the controller 9 closes the regulating valve 6 and opens the anti-surge valve 14. After the reading of the exhaust pressure detection device 3 stabilizes, the steam compressor 1 is turned off.

[0171] The step of the variable operating condition operation test can test the operating performance of the steam compressor 1 under variable operating conditions.

[0172] Step 3: Shutdown operation of steam compressor system:

[0173] Close the first regulating valve 6, open the anti-surge valve 14, and turn off the compressor after the value of the exhaust pressure detection device 3 stabilizes; turn off the cooling water pump 24, cooling water valve 25, water supply pump 29 and water supply valve 30 in sequence; turn off the cooling device, open the drain valve 39 and the water supply valve 33, and drain the water in the steam compressor system out of the steam compressor system, thereby completing the shutdown of the steam compressor system.

[0174] The control method of the steam compressor in the embodiment of the present application detects multiple parameters in the steam compressor system (such as temperature, pressure, steam flow, etc.) through multiple sensors and flow meters. The performance of the steam compressor can be evaluated based on the multiple parameter data obtained by the detection, and the evaluation results are relatively comprehensive and accurate.

[0175] The control method of the steam compressor of the embodiment of the present application can use the cooled water working medium to recover most of the latent heat of the exhaust steam of the steam compressor 1, and a small part of the latent heat of the exhaust steam and all the sensible heat are then dissipated out of the steam compressor system through the cooling device 36, thereby realizing the circulation recovery of heat inside the steam compressor system; the cooled water working medium is discharged into the atmospheric pressure water tank 37, and is recycled into the double-sided phase change tank 27 to absorb heat in phase change to generate low-pressure steam, thereby realizing the circulation recovery of the medium inside the steam compressor system, and greatly reducing the cost investment and operating energy consumption.

[0176] It should be noted that although the steps in the flowcharts of the accompanying drawings are shown in sequence as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in the flowcharts of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0177] The above description is only a preferred embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made based on the contents of the present application specification and drawings, or direct / indirect application in other related technical fields, are included in the patent protection scope of the present application.

Claims

1. A steam compressor system, characterized in that: It includes a steam compressor, a controller, a heat exchange device, and a steam inlet pressure detection device, an exhaust pressure detection device and a steam flow detection device respectively connected to the controller; The heat exchange device includes a gas phase area and a liquid phase area, and the gas phase area is connected to the steam inlet of the steam compressor through a steam inlet pipeline; the steam inlet pressure detection device is arranged on the steam inlet pipeline; a heat exchange coil and a heating device are arranged in the liquid phase area; the inlet of the heat exchange coil is connected to the steam outlet of the steam compressor through an exhaust pipeline; the exhaust pressure detection device and the steam flow detection device are arranged on the exhaust pipeline; the controller is connected to the steam compressor and the heating device respectively.

2. The system according to claim 1, wherein: The outlet of the heat exchange coil extends to the outside of the heat exchange device.

3. The system according to claim 2, characterized in that The exhaust steam pipeline is provided with a first regulating valve connected to the controller.

4. The system according to claim 3, characterized in that The system also includes a steam bypass pipeline, a first end of which is connected to the pipeline section between the first regulating valve and the inlet of the heat exchange coil, a second end of which is connected to the atmosphere, and a second regulating valve connected to the controller is provided on the steam bypass pipeline.

5. The system according to claim 3, wherein: The steam compressor system also includes a pressure stabilizing container, which is arranged on the pipeline section between the first regulating valve and the inlet of the heat exchange coil. The inlet of the pressure stabilizing container is connected to the steam outlet, and the outlet of the pressure stabilizing container is connected to the inlet of the heat exchange coil.

6. The system according to claim 5, characterized in that A pressure regulating valve connected to the controller is provided on the pipeline section between the outlet of the pressure stabilizing container and the inlet of the heat exchange coil.

7. The system according to claim 5, characterized in that The steam compressor system further includes a normal pressure water tank. The outlet of the heat exchange coil is connected to the inlet of the normal pressure water tank through a pipeline, and the normal pressure water tank is connected to the atmosphere.

8. The system according to claim 7, characterized in that The steam compressor system also includes a cooling device connected to the controller, and the cooling device is arranged on the pipeline between the heat exchange coil and the atmospheric pressure water tank. The inlet of the cooling device is connected to the outlet of the heat exchange coil through a pipeline, and the outlet of the cooling device is connected to the inlet of the atmospheric pressure water tank through a pipeline.

9. The system according to claim 8, characterized in that The inlet of the cooling device is communicated with the outlet of the pressure-stabilizing container through a steam bypass pipeline. A second regulating valve is provided on the steam bypass pipeline, and the second regulating valve is connected to the controller.

10. The system according to claim 9, characterized in that The outlet of the pressure-stabilizing container is connected to a pressure-regulating pipeline, the steam bypass pipeline is connected to the pressure-regulating pipeline, the inlet of the heat exchange coil is connected to the pressure-regulating pipeline through a steam heat recovery pipe, a pressure-regulating valve is provided on the pressure-regulating pipeline, and the pressure-regulating valve is connected to the controller.

11. The system according to any one of claims 7 to 10, characterized in that The atmospheric water tank is connected to the spray device in the steam compressor through a cooling water pipeline. A cooling water valve and a cooling water pump are provided on the cooling water pipeline. The cooling water valve and the cooling water pump are respectively connected to the controller.

12. The system according to any one of claims 7 to 10, characterized in that The atmospheric pressure water tank is connected to the liquid phase region through a water supply pipeline. A water supply valve and a water supply pump are provided on the water supply pipeline. The water supply valve and the water supply pump are respectively connected to the controller.

13. The system according to any one of claims 1 to 10, characterized in that The system also includes a branch line, a first end of the branch line is connected to the exhaust line, a second end of the branch line is connected to the atmosphere, the branch line is connected to the steam inlet line through an anti-surge line, an anti-surge valve is provided on the anti-surge line, and the anti-surge valve is connected to the controller.

14. The system according to claim 13, wherein: A check valve and a drain valve are provided on the branch line. Both the check valve and the drain valve are located on the pipeline section between the anti-surge pipeline and the second end of the branch line. The check valve and the drain valve are respectively connected to the controller.

15. The system according to any one of claims 1 to 10, characterized in that A gas-liquid separator is provided on the steam inlet pipeline, and the gas-liquid separator is communicated with the gas phase region through the steam inlet pipeline, and the gas-liquid separator is communicated with the liquid phase region through a pipeline.

16. The system according to any one of claims 1 to 10, characterized in that The steam inlet pipe is provided with a steam inlet temperature detection device connected to the controller, the steam exhaust pipe is provided with an exhaust temperature detection device connected to the controller, and / or the liquid phase region is provided with a temperature detection device connected to the controller.

17. A method for controlling a steam compressor, characterized in that: Applied to the steam compressor system according to any one of claims 1 to 16, the control method comprises: controlling the heating device to heat the liquid in the liquid phase region to generate steam input into the steam inlet; controlling the steam compressor to operate so as to compress the steam and output the compressed steam from the steam outlet; obtaining the steam inlet pressure detected by the steam inlet pressure detection device, the exhaust pressure detected by the exhaust pressure detection device, and the steam flow detected by the steam flow detection device; Whether the steam compressor meets preset performance requirements is determined based on the steam inlet pressure, the exhaust pressure, and the steam flow rate.

18. The method according to claim 17, characterized in that Applied to the steam compressor system according to claim 6 or 10, obtaining the inlet steam pressure detected by the inlet steam pressure detection device, the exhaust steam pressure detected by the exhaust steam pressure detection device, and the steam flow detected by the steam flow detection device, comprising: receiving the steam inlet pressure detected by the steam inlet pressure detecting device, and controlling the opening of the second regulating valve according to a first preset interval and the steam inlet pressure to adjust the steam inlet pressure; receiving the exhaust steam pressure detected by the exhaust steam pressure detection device, and controlling the opening of the pressure regulating valve according to a second preset interval and the exhaust steam pressure to adjust the exhaust steam pressure; When the steam inlet pressure belongs to the first preset range and the exhaust steam pressure belongs to the second preset range, the steam flow rate detected by the steam flow rate detection device is obtained.

19. The method according to claim 17 or 18, characterized in that Applied to the steam compressor system according to claim 10, an exhaust temperature detection device connected to the controller is provided on the exhaust pipe, and the control method further includes: obtaining the exhaust steam temperature detected by the exhaust steam temperature detection device; controlling the opening of the cooling water valve and the power of the cooling water pump according to a preset temperature range and the exhaust steam temperature to adjust the exhaust steam temperature until the exhaust steam temperature falls within the preset temperature range; Whether the steam compressor meets preset performance requirements is determined based on the steam inlet pressure, the exhaust pressure, the steam flow rate, and the exhaust temperature.

20. The method according to claim 18, wherein The control method further includes: According to the steam flow detected by the steam flow detection device and the preset flow range, the operating frequency of the steam compressor is adjusted, and the controller returns to receive the steam inlet pressure detected by the steam inlet pressure detection device, and the process is executed in a loop until the steam flow falls within the preset flow range.

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