Compressor system, control method thereof and water vapor compression equipment

Abstract

The invention relates to a compressor system, a control method thereof and water vapor compression equipment. The compressor system comprises a first compressor (1) and a second compressor (2) which are connected in series; the heating device (3) is respectively connected with the first compressor (1) and the second compressor (2) and is configured to heat steam; the on-off valve (4) is arranged between an exhaust port of the first compressor (1) and the heating device (3); the controller (5) is in signal connection with the on-off valve (4) and is configured to switch on and off of the on-off valve (4) according to the external temperature rise requirement, so that when the on-off valve (4) is conducted, the first compressor (1) and the heating device (3) form a first heating loop independently, and when the on-off valve (4) is conducted, the first compressor (1) and the heating device (3) form a second heating loop independently; and when the on-off valve (4) is switched off, the first compressor (1) and the second compressor (2) jointly form a second heating loop with the heating device (3).

Description

Technical Field

[0001] The present disclosure relates to the field of compressors, and in particular to a compressor system and a control method thereof, and a water vapor compression device. Background Art

[0002] A steam compressor is a device used to raise low-pressure steam to high pressure. It increases the pressure and temperature of the steam by mechanical means. During the compression process, the distance between the molecules of the steam is compressed, which causes its internal energy to increase and the temperature to rise, providing a higher energy density for steam utilization and improving energy utilization efficiency.

[0003] The maximum temperature rise of the water vapor compressor in the related art is 20°C. For example, if the steam inlet temperature of the water vapor compressor is 100°C, the temperature can only rise to 120°C after compression by the water vapor compressor, corresponding to a saturation pressure of 0.2Mpa, which is difficult to meet the demand for industrial heat. Summary of the invention

[0004] In view of this, an embodiment of the present disclosure provides a compressor system and a control method thereof and a water vapor compression device, which can improve the controllability of temperature rise.

[0005] In one aspect of the present disclosure, there is provided a compressor system, comprising:

[0006] a first compressor and a second compressor connected in series;

[0007] a heating device, connected to the first compressor and the second compressor, respectively, and configured to heat the steam;

[0008] an on-off valve disposed between the exhaust port of the first compressor and the heating device; and

[0009] The controller is connected to the on-off valve signal and is configured to switch the on-off valve according to the external heating demand, so that when the on-off valve is on, the first compressor forms a first heating circuit with the heating device alone, and when the on-off valve is off, the first compressor and the second compressor form a second heating circuit with the heating device together.

[0010] In some embodiments, the compressor system further comprises:

[0011] A first detection device is configured to obtain an intake pressure and a boost pressure of a first compressor;

[0012] The controller is signal-connected to the first compressor, the second compressor and the first detection device, and the controller is further configured as follows:

[0013] In response to the sum of the intake pressure and the boost pressure of the first compressor being greater than or equal to a preset pressure, the first compressor alone forms a first heating circuit with the heating device so that the first compressor operates independently; and

[0014] In response to the sum of the intake pressure and the boost pressure of the first compressor being less than a preset pressure, the first compressor and the second compressor together with the heating device form a second heating circuit so that the first compressor and the second compressor operate in series.

[0015] In some embodiments, the compressor system further comprises:

[0016] A first exhaust valve is disposed between an exhaust port of the first compressor and an intake port of the second compressor; and

[0017] A second exhaust valve is disposed between the exhaust port of the second compressor and the heating device;

[0018] The controller is connected to the first exhaust valve and the second exhaust valve signal, and the controller is further configured as follows:

[0019] In response to the sum of the intake pressure of the first compressor and the boost pressure being greater than or equal to a preset pressure, closing the first exhaust valve and the second exhaust valve; and

[0020] In response to the sum of the intake pressure and the boost pressure of the first compressor being less than a preset pressure, the first exhaust valve and the second exhaust valve are opened.

[0021] In some embodiments, the compressor system further comprises:

[0022] a cooling device connected to the first compressor and the second compressor and configured to provide cooling liquid to the impellers of the first compressor and the second compressor respectively;

[0023] A regulating valve group, disposed in a coolant supply pipeline between the cooling device and the first compressor and the second compressor, configured to regulate the coolant flow; and

[0024] a second detection device configured to obtain exhaust gas superheat of the impellers of the first compressor and the second compressor respectively;

[0025] The controller is signal-connected to the regulating valve group and the second detection device, and is configured to adjust the coolant flow provided by the cooling device according to the exhaust superheat of the impellers of the first compressor and the second compressor.

[0026] In some embodiments, the first compressor includes a first motor, a first impeller, and a second impeller, wherein the first impeller and the second impeller are respectively disposed on both sides of the first motor;

[0027] The second compressor includes a second motor, a third impeller and a fourth impeller, and the third impeller and the fourth impeller are respectively arranged on both sides of the second motor.

[0028] In some embodiments, the cooling device is connected to the first impeller, the second impeller, the third impeller and the fourth impeller respectively;

[0029] Among them, the regulating valve group includes:

[0030] A first water supply valve is disposed between the cooling device and the first impeller and is configured to adjust the flow rate of coolant provided by the cooling device to the first impeller;

[0031] a second water supply valve, disposed between the cooling device and the second impeller, and configured to adjust a flow rate of coolant provided by the cooling device to the second impeller;

[0032] A third water supply valve is disposed between the cooling device and the third impeller and is configured to adjust the flow rate of coolant provided by the cooling device to the third impeller; and

[0033] a fourth water supply valve, disposed between the cooling device and the fourth impeller, and configured to adjust a flow rate of coolant provided by the cooling device to the fourth impeller;

[0034] Wherein, the second detection device is configured to respectively obtain the exhaust gas superheat of the first impeller, the second impeller, the third impeller and the fourth impeller;

[0035] The controller is also configured to adjust the opening of the first water supply valve according to the exhaust superheat of the first impeller, adjust the opening of the second water supply valve according to the exhaust superheat of the second impeller, adjust the opening of the third water supply valve according to the exhaust superheat of the third impeller, and adjust the opening of the fourth water supply valve according to the exhaust superheat of the fourth impeller.

[0036] In some embodiments, the first compressor further includes a first air suspension bearing, and the first air suspension bearing is disposed at both ends of the first motor;

[0037] The second compressor also includes a second air suspension bearing, and the second air suspension bearing is arranged at two ends of the second motor.

[0038] In some embodiments, the first compressor and the second compressor are centrifugal compressors.

[0039] In another aspect of the present disclosure, there is provided a water vapor compression device, comprising:

[0040] A compressor system as in any of the above embodiments.

[0041] In another aspect of the present disclosure, a control method for a compressor system based on any one of the above embodiments is provided, comprising:

[0042] Obtain external heating requirements;

[0043] The on-off valve is switched on and off according to the external heating demand, so that when the on-off valve is on, the first compressor forms a first heating circuit with the heating device alone, and when the on-off valve is off, the first compressor and the second compressor form a second heating circuit with the heating device together.

[0044] In some embodiments, switching the on-off valve according to the external heating demand so that the first compressor forms a first heating circuit with the heating device alone when the on-off valve is on, and the first compressor and the second compressor form a second heating circuit with the heating device together when the on-off valve is off specifically includes:

[0045] In response to the sum of the intake pressure and the boost pressure of the first compressor being greater than or equal to a preset pressure, the first compressor alone forms a first heating circuit with the heating device so that the first compressor operates independently; and

[0046] In response to the sum of the intake pressure and the boost pressure of the first compressor being less than a preset pressure, the first compressor and the second compressor together with the heating device form a second heating circuit so that the first compressor and the second compressor operate in series.

[0047] In some embodiments, the compressor system further includes a cooling device, the cooling device being connected to the impellers of the first compressor and the second compressor, respectively, and being configured to provide cooling liquid to the impellers of the first compressor and the second compressor, respectively;

[0048] The control method further includes:

[0049] respectively obtaining exhaust gas superheats of the impellers of the first compressor and the second compressor;

[0050] The coolant flow rates provided by the cooling device are adjusted respectively according to the exhaust gas superheat of the impellers of the first compressor and the second compressor.

[0051] Therefore, according to the embodiment of the present disclosure, by obtaining the boosting capacity of the first compressor and judging whether the boosting capacity of the first compressor meets the external heat demand, and then switching the operating states of the first compressor and the second compressor in real time, the compressor system can always ensure sufficient heat supply, maintain efficient operation of the system, and ensure that the system does not start additional compressors when unnecessary, thereby avoiding energy waste, being able to more accurately control the operating state of the compressor, and responding more quickly to changes in user demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0053] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0054] Figure 1 is a schematic structural diagram of some embodiments of the compressor system according to the present disclosure;

[0055] Figure 2 is a connection diagram of some embodiments of the compressor system according to the present disclosure;

[0056] Figure 3 is a flow chart of some embodiments of the control method according to the present disclosure.

[0057] In the figure:

[0058] 1. first compressor; 11. first motor; 12. first impeller; 13. second impeller; 14. first air suspension bearing;

[0059] 2. second compressor; 21. second motor; 22. third impeller; 23. fourth impeller; 24. second air suspension bearing;

[0060] 3. Heating device;

[0061] 4. On-off valve;

[0062] 5. Controller;

[0063] 61. First detection device; 62. Second detection device; 621. First temperature sensor; 622. Second temperature sensor; 623. Third temperature sensor; 624. Fourth temperature sensor; 625. Fifth pressure sensor; 626. Sixth pressure sensor; 627. Seventh pressure sensor; 628. Eighth pressure sensor;

[0064] 71. First exhaust valve; 72. Second exhaust valve;

[0065] 8. Cooling device;

[0066] 9. Regulating valve group; 91. First water supply valve; 92. Second water supply valve; 93. Third water supply valve; 94. Fourth water supply valve.

[0067] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0068] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0069] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0070] In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other device without an intermediate device, or may not be directly connected to the other device but have an intermediate device.

[0071] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0072] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0073] A steam compressor is a device used to raise low-pressure steam to high pressure. It increases the pressure and temperature of the steam by mechanical means. During the compression process, the distance between the molecules of the steam is compressed, which causes its internal energy to increase and the temperature to rise, providing a higher energy density for steam utilization and improving energy utilization efficiency.

[0074] The maximum temperature rise of the water vapor compressor in the related art is 20°C. For example, if the steam inlet temperature of the water vapor compressor is 100°C, the temperature can only rise to 120°C after compression by the water vapor compressor, corresponding to a saturation pressure of 0.2Mpa, which is difficult to meet the demand for industrial heat.

[0075] In view of this, in one aspect of an embodiment of the present disclosure, a compressor system is provided, which can improve the controllability of temperature rise.

[0076] Figure 1 is a schematic diagram of the structure of some embodiments of the compressor system according to the present disclosure, Figure 1 The arrow in the figure indicates the direction of steam movement. Figure 2 is a connection diagram of some embodiments of the compressor system according to the present disclosure, with reference to Figure 1~Figure 2 The compressor system includes: a first compressor 1, a second compressor 2, a heating device 3, an on-off valve 4 and a controller 5.

[0077] The first compressor 1 and the second compressor 2 are connected in series. The heating device 3 is connected to the first compressor 1 and the second compressor 2 respectively, and the heating device 3 is configured to heat steam. The on-off valve 4 is arranged between the exhaust port of the first compressor 1 and the heating device 3, and is configured to switch the pipeline between the exhaust port of the first compressor 1 and the heating device 3 on and off.

[0078] The controller 5 is connected to the on-off valve 4 signal, and is configured to switch the on-off valve 4 according to the heating demand, so that when the on-off valve 4 is on, the first compressor 1 alone forms a first heating circuit with the heating device 3, and when the on-off valve 4 is off, the first compressor 1 and the second compressor 2 form a second heating circuit together with the heating device 3.

[0079] The heating demand is the external heat demand, which is determined according to the actual use situation. The on-off valve 4 includes but is not limited to a bypass valve.

[0080] When the on-off valve 4 is closed and turned on, the low-pressure steam coming out of the heating device 3 is compressed by the first compressor 1, and the high-temperature steam can directly return to the heating device 3 to form a first heating circuit, and the steam circulates between the heating device 3 and the first compressor 1.

[0081] When the on-off valve 4 is disconnected, the low-pressure steam coming out of the heating device 3 is compressed by the first compressor 1, enters the second compressor 2 for compression and temperature increase again, and enters the heating device 3 at a higher temperature. The steam circulates between the heating device 3, the first compressor 1, and the second compressor 2.

[0082] In this embodiment, the switching operation of the first heating circuit and the second heating circuit can be achieved by switching the on-off valve 4. When the external heat demand is large, the first compressor 1 and the second compressor 2 work together to provide a higher compressor temperature and achieve a greater temperature rise. When the external heat demand is small, the first compressor 1 works independently to optimize the system energy consumption, thereby improving the controllability of the temperature rise of the compressor, meeting diverse heat demands, and saving operating costs.

[0083] refer to Figure 1 and Figure 2 In some embodiments, the compressor system further includes a first detection device 61. The first detection device 61 is configured to obtain the intake pressure and the boost pressure of the first compressor 1.

[0084] The controller 5 is signal-connected to the first compressor 1, the second compressor 2 and the first detection device 61. The controller 5 is also configured to, in response to the sum of the intake pressure and the boost pressure of the first compressor 1 being greater than or equal to a preset pressure, enable the first compressor 1 to form a first heating circuit with the heating device 3 alone, so that the first compressor 1 operates independently;

[0085] In response to the sum of the intake pressure and the boost pressure of the first compressor 1 being less than a preset pressure, the first compressor 1 and the second compressor 2 form a second heating circuit together with the heating device 3 so that the first compressor 1 and the second compressor 2 operate in series.

[0086] The first detection device 61 includes a first pressure sensor, a second pressure sensor, a third pressure sensor, and a fourth pressure sensor. The first pressure sensor is disposed near the air inlet of the first compressor 1 and is configured to obtain the air inlet pressure of the first compressor 1. The second pressure sensor is disposed near the air outlet of the first compressor 1 and is configured to obtain the air outlet pressure of the first compressor 1.

[0087] The third pressure sensor is disposed near the air inlet of the second compressor 2 and is configured to obtain the air inlet pressure of the second compressor 2. The fourth pressure sensor is disposed near the air outlet of the second compressor 2 and is configured to obtain the air outlet pressure of the second compressor 2. The controller 5 can detect the boost condition of the second compressor according to the pressure data of the third pressure sensor and the fourth pressure sensor.

[0088] The difference between the outlet pressure and the inlet pressure of the first compressor 1 is the boost pressure of the first compressor 1. The preset pressure ranges from 100 to 700 kPa, and the boost capacity of the first compressor 1 includes but is not limited to 100 to 300 kPa. The preset pressure can be adjusted according to actual needs.

[0089] When the sum of the intake pressure and the boost pressure of the first compressor 1 is greater than or equal to the preset pressure, the boost capacity of the first compressor 1 can meet the heating demand of the user end, and single compressor operation is executed. Only the first compressor 1 needs to be turned on to make the first compressor 1 run independently, and the second compressor 2 is turned off.

[0090] When the sum of the intake pressure and the boost pressure of the first compressor 1 is less than the preset pressure, the boost capacity of the first compressor 1 cannot meet the heat demand of the user end, and the dual compressors are operated in series, so that the first compressor 1 and the second compressor 2 run at the same time.

[0091] In this embodiment, by obtaining the boosting capacity of the first compressor 1 and determining whether the boosting capacity of the first compressor 1 meets the external heat demand, and then switching the operating states of the first compressor 1 and the second compressor 2 in real time, the compressor system can always ensure sufficient heat supply, maintain efficient operation of the system, and ensure that the system will not start additional compressors when unnecessary, thereby avoiding energy waste, being able to more accurately control the operating state of the compressor, and being able to respond more quickly to changes in user demand.

[0092] refer to Figure 1 and Figure 2 In some embodiments, the compressor system further includes a first exhaust valve 71 and a second exhaust valve 72. The first exhaust valve 71 is disposed between the exhaust port of the first compressor 1 and the intake port of the second compressor 2, and the second exhaust valve 72 is disposed between the exhaust port of the second compressor 2 and the heating device 3.

[0093] The controller 5 is connected to the first exhaust valve 71 and the second exhaust valve 72 by signals, and the controller 5 is also configured to: in response to the sum of the intake pressure and the boost pressure of the first compressor 1 being greater than or equal to a preset pressure, close the first exhaust valve 71 and the second exhaust valve 72; and in response to the sum of the intake pressure and the boost pressure of the first compressor 1 being less than a preset pressure, open the first exhaust valve 71 and the second exhaust valve 72.

[0094] The first exhaust valve 71 is configured to switch the pipeline between the exhaust port of the first compressor 1 and the intake port of the second compressor 2 , and the second exhaust valve 72 is configured to switch the pipeline between the exhaust port of the second compressor 2 and the heating device 3 .

[0095] When the system switches to the independent operation of the first compressor 1 , the first exhaust valve 71 and the second exhaust valve 72 are closed, so that the steam pressurized by the first compressor 1 returns directly to the heating device 3 without passing through the second compressor 2 .

[0096] When the system switches to the series operation of the first compressor 1 and the second compressor 2, the first exhaust valve 71 and the second exhaust valve 72 are opened, so that the steam pressurized by the first compressor 1 enters the intake port of the second compressor 2, is compressed again by the second compressor 2, and is discharged through the exhaust port of the second compressor 2, and then returns to the heating device 3.

[0097] The first exhaust valve 71 and the second exhaust valve 72 include but are not limited to electric butterfly valves, electric ball valves, manual butterfly valves or manual ball valves, and can be adjusted according to actual needs.

[0098] In this embodiment, by respectively arranging the first exhaust valve 71 and the second exhaust valve 72 at the air inlet and the air intake of the second compressor 2, unnecessary energy loss caused by steam reflux can be prevented, and the system can be switched between the first heating circuit and the second heating circuit more accurately and reliably in response to external heat demand, thereby ensuring the normal operation of the compressor system under different working conditions.

[0099] refer to Figure 1 and Figure 2 In some embodiments, the compressor system further includes: a cooling device 8, a regulating valve group 9 and a second detection device 62. The cooling device 8 is connected to the first compressor 1 and the second compressor 2, and is configured to provide cooling liquid to the impellers of the first compressor 1 and the second compressor 2, respectively.

[0100] The regulating valve group 9 is arranged in the coolant supply pipeline between the cooling device 8 and the first compressor 1 and the second compressor 2, and is configured to adjust the coolant flow. The second detection device 62 is configured to obtain the exhaust gas superheat of the impellers of the first compressor 1 and the second compressor 2 respectively.

[0101] The controller 5 is signal-connected to the regulating valve group 9 and the second detection device 62 , and is configured to adjust the coolant flow provided by the cooling device 8 according to the exhaust superheat of the impellers of the first compressor 1 and the second compressor 2 .

[0102] The cooling device 8 includes but is not limited to a water supply tank, which reduces the exhaust superheat of the compressor by spraying water, increases the amount of water vapor produced, prevents the compressor from overheating and damage, and ensures the reliability of the compressor operation.

[0103] The number of cooling devices 8 can be adjusted according to the number of compressors and / or the number of impellers in the system, including but not limited to providing two cooling devices 8, connected to the first compressor 1 and the second compressor 2 respectively.

[0104] The second detection device 62 detects the exhaust pressure and exhaust temperature of the exhaust outlet of each impeller of the first compressor 1 and the second compressor 2 respectively. The controller 5 determines the exhaust saturation temperature of each impeller based on the exhaust pressure and exhaust temperature of the exhaust outlet of each impeller obtained by the second detection device 62. The exhaust saturation temperature of the impeller is the superheat of the impeller.

[0105] The regulating valve group 9 may include a plurality of regulating valves, which are respectively arranged on the connecting pipelines between the impeller of the compressor and the cooling device 8, respectively adjusting the flow of each coolant supply pipeline, so as to provide cooling to each impeller in a targeted manner. The regulating valve includes but is not limited to an electric ball valve or a solenoid valve, which can be adjusted according to actual needs.

[0106] When the difference between the exhaust temperature of the impeller and the exhaust superheat is less than the first preset superheat, the amount of water sprayed by the cooling device 8 is too much. The coolant flow provided by the cooling device 8 should be reduced, and the opening of the regulating valve of the corresponding pipeline should be reduced.

[0107] When the difference between the exhaust temperature of the impeller and the exhaust superheat is greater than or equal to the first preset superheat and less than or equal to the second preset superheat, the water replenishment spray amount of the cooling device 8 is appropriate at this time, and the opening of the regulating valve of the corresponding pipeline remains unchanged.

[0108] When the difference between the exhaust temperature of the impeller and the high exhaust superheat is greater than the second preset superheat, the exhaust superheat of the impeller is too high and the water replenishment spray amount of the cooling device 8 is too small. The coolant flow rate provided by the cooling device 8 should be increased, and the opening of the regulating valve of the corresponding pipeline should be increased.

[0109] After each regulating action of the regulating valve group 9, the controller 5 continues to detect the exhaust superheat and again determines the temperature relationship between the current exhaust superheat and the first preset superheat and the second preset superheat, and controls the opening of the regulating valve group 9 accordingly, thereby realizing the cycle.

[0110] The first preset superheat includes but is not limited to 5-10 degrees Celsius, and the second preset superheat includes but is not limited to 10-20 degrees Celsius. The values ​​of the first preset superheat and the second preset superheat can be adjusted according to actual conditions.

[0111] In this embodiment, by monitoring the exhaust superheat of the first compressor 1 and the second compressor 2, and targetedly cooling the impellers of the compressors by spraying liquid 1, the heat generated during the compression process can be reduced, the energy loss caused by the temperature increase can be reduced, the compression efficiency can be improved, the exhaust of the compressors can be kept at an appropriate superheat, and the amount of water vapor produced can be maintained within an appropriate range, making the compression process more efficient and stable.

[0112] refer to Figure 1 and Figure 2In some embodiments, the first compressor 1 includes a first motor 11 , a first impeller 12 , and a second impeller 13 , and the first impeller 12 and the second impeller 13 are respectively disposed on both sides of the first motor 11 .

[0113] The second compressor 2 includes a second motor 21 , a third impeller 22 and a fourth impeller 23 . The third impeller 22 and the fourth impeller 23 are respectively disposed on both sides of the second motor 21 .

[0114] In this embodiment, the first compressor 1 and the second compressor 2 may be two-stage compressors, each having two impellers, which can more effectively compress the steam, so that the steam has a higher pressure, and the compressor system has a higher working efficiency.

[0115] refer to Figure 1 and Figure 2 In some embodiments, the cooling device 8 is connected to the first impeller 12, the second impeller 13, the third impeller 22 and the fourth impeller 23 respectively.

[0116] The regulating valve group 9 includes a second water supply valve 92, a third water supply valve 93 and a fourth water supply valve 94. The first water supply valve 91 is arranged between the cooling device 8 and the first impeller 12, and is configured to adjust the flow rate of coolant provided by the cooling device 8 to the first impeller 12. The second water supply valve 92 is arranged between the cooling device 8 and the second impeller 13, and is configured to adjust the flow rate of coolant provided by the cooling device 8 to the second impeller 13. The third water supply valve 93 is arranged between the cooling device 8 and the third impeller 22, and is configured to adjust the flow rate of coolant provided by the cooling device 8 to the third impeller 22. The fourth water supply valve 94 is arranged between the cooling device 8 and the fourth impeller 23, and is configured to adjust the flow rate of coolant provided by the cooling device 8 to the fourth impeller 23.

[0117] The second detection device 62 is configured to respectively obtain the exhaust superheat of the first impeller 12, the second impeller 13, the third impeller 22 and the fourth impeller 23. The controller 5 is also configured to adjust the opening of the first water replenishment valve 91 according to the exhaust superheat of the first impeller 12, adjust the opening of the second water replenishment valve 92 according to the exhaust superheat of the second impeller 13, adjust the opening of the third water replenishment valve 93 according to the exhaust superheat of the third impeller 22, and adjust the opening of the fourth water replenishment valve 94 according to the exhaust superheat of the fourth impeller 23.

[0118] The second detection device 62 may include a first temperature sensor 621 , a second temperature sensor 622 , a third temperature sensor 623 , a fourth temperature sensor 624 , a fifth pressure sensor 625 , a sixth pressure sensor 626 , a seventh pressure sensor 627 , and an eighth pressure sensor 628 .

[0119] The first temperature sensor 621 is disposed in the pipeline of the exhaust outlet of the first impeller 12, and is configured to detect the exhaust temperature of the first impeller 12. The second temperature sensor 622 is disposed in the pipeline of the exhaust outlet of the second impeller 13, and is configured to detect the exhaust temperature of the second impeller 13. The third temperature sensor 623 is disposed in the pipeline of the exhaust outlet of the third impeller 22, and is configured to detect the exhaust temperature of the third impeller 22. The fourth temperature sensor 624 is disposed in the pipeline of the exhaust outlet of the fourth impeller 23, and is configured to detect the exhaust temperature of the fourth impeller 23.

[0120] The fifth pressure sensor 625 is disposed in the pipeline of the exhaust outlet of the first impeller 12, and is configured to detect the exhaust pressure of the first impeller 12. The sixth pressure sensor 626 is disposed in the pipeline of the exhaust outlet of the second impeller 13, and is configured to detect the exhaust pressure of the second impeller 13. The seventh pressure sensor 627 is disposed in the pipeline of the exhaust outlet of the third impeller 22, and is configured to detect the exhaust pressure of the third impeller 22. The eighth pressure sensor 628 is disposed in the pipeline of the exhaust outlet of the fourth impeller 23, and is configured to detect the exhaust pressure of the fourth impeller 23.

[0121] In this embodiment, a pressure sensor and a temperature sensor are respectively arranged on the exhaust outlet pipeline of each stage of the impeller to monitor the exhaust pressure and exhaust temperature of each stage of the impeller, thereby determining the exhaust superheat of each stage of the impeller. A water supply valve is arranged between each stage of the impeller and the cooling device 8 to adjust the flow rate of the water spray cooling in a targeted manner to ensure that each stage of the impeller operates under the best working conditions, reduce unnecessary energy loss, improve the overall compression efficiency, and provide important guarantees for the safe, stable and economical operation of the compressor system.

[0122] refer to Figure 1 and Figure 2 In some embodiments, the first compressor 1 further includes a first air bearing 14 disposed at both ends of the first motor 11 . The second compressor 2 further includes a second air bearing 24 disposed at both ends of the second motor 21 .

[0123] In this embodiment, the first compressor 1 and the second compressor 2 use air suspension bearings, which rely on the high-speed rotation of the motor to generate buoyancy to suspend the rotor, which can meet the needs of high-temperature applications and help to generate high-quality steam, realize oil-free operation of the compressor, and avoid the generation of oil stains, oil mist, etc. during the use of the compressor.

[0124] refer to Figure 1 and Figure 2 In some embodiments, the first compressor 1 and the second compressor 2 are centrifugal compressors.

[0125] In this embodiment, the first compressor 1 and the second compressor 2 are centrifugal compressors, which can achieve oil-free operation, avoiding the problems of oil mist, oil stains, etc. generated by lubricated water vapor compressors during use, and helping to produce clean, oil-free, high-quality water vapor, so that the compressor system can be used in industries such as medical, food, and electronics that have strict requirements on gas quality and safety, and has wide applicability.

[0126] refer to Figure 1 and Figure 2 In another aspect of the embodiments of the present disclosure, a water vapor compression device is provided, comprising a compressor system as described in any of the above embodiments.

[0127] Water vapor compression equipment allows for oil-free operation, avoiding problems such as oil mist and oil stains during use, and helps to produce clean, oil-free, high-quality water vapor, enabling water vapor compression equipment to be used in industries such as medical, food, and electronics that have strict requirements on gas quality and safety, and has a broad market space.

[0128] In this embodiment, the water vapor compression equipment can achieve a greater temperature rise when two compressors are connected in series, meeting the heat needs of most non-process industries, and the water vapor compression equipment can realize the switching between single and dual compressor operation, adjust the number of compressors in operation according to actual heat demand, adapt the performance characteristics of the compressors, achieve efficient operation, and have high controllability.

[0129] Figure 3 is a flowchart of some embodiments of the control method of the present disclosure, referring to Figure 1~Figure 3 In another aspect of the embodiments of the present disclosure, a control method for a compressor system based on any of the above embodiments is provided.

[0130] The control method includes step S1 and step S2. In step S1, an external heating demand is obtained. In step S2, the on-off valve 4 is switched on and off according to the external heating demand, so that when the on-off valve 4 is on, the first compressor 1 forms a first heating circuit with the heating device 3 alone, and when the on-off valve 4 is off, the first compressor 1 and the second compressor 2 form a second heating circuit with the heating device 3 together.

[0131] In this embodiment, the switching operation of the first heating circuit and the second heating circuit can be achieved by switching the on-off valve 4. When the external heat demand is large, the first compressor 1 and the second compressor 2 work together to provide a higher compressor temperature and achieve a greater temperature rise. When the external heat demand is small, the first compressor 1 works independently to optimize the system energy consumption. It has the ability to adjust the number of operating compressors according to the heat demand, thereby improving the controllability of the temperature rise of the compressor, meeting diverse heat demands, and saving operating costs.

[0132] refer to Figure 1~Figure 3 In some embodiments, switching the on-off valve 4 according to the external heating demand, so that when the on-off valve 4 is on, the first compressor 1 forms a first heating circuit with the heating device 3 alone, and when the on-off valve 4 is off, the first compressor 1 and the second compressor 2 form a second heating circuit with the heating device 3 together, specifically including:

[0133] In response to the sum of the intake pressure and the boost pressure of the first compressor 1 being greater than or equal to a preset pressure, the first compressor 1 alone forms a first heating circuit with the heating device 3 so that the first compressor 1 operates independently; and

[0134] In response to the sum of the intake pressure and the boost pressure of the first compressor 1 being less than a preset pressure, the first compressor 1 and the second compressor 2 form a second heating circuit together with the heating device 3 so that the first compressor 1 and the second compressor 2 operate in series.

[0135] In this embodiment, by obtaining the boosting capacity of the first compressor 1 and determining whether the boosting capacity of the first compressor 1 meets the external heat demand, and then switching the operating states of the first compressor 1 and the second compressor 2 in real time, the compressor system can always ensure sufficient heat supply, maintain efficient operation of the system, and ensure that the system will not start additional compressors when unnecessary, thereby avoiding energy waste, being able to more accurately control the operating state of the compressor, and being able to respond to changes in user demand more quickly and accurately.

[0136] refer to Figure 1~Figure 3 In some embodiments, the compressor system further includes a cooling device 8, which is connected to the impellers of the first compressor 1 and the second compressor 2, respectively, and is configured to provide cooling liquid to the impellers of the first compressor 1 and the second compressor 2, respectively.

[0137] The control method further includes: step S3 and step S4. In step S3, the exhaust gas superheat of the impellers of the first compressor 1 and the second compressor 2 is obtained respectively. In step S4, the coolant flow provided by the cooling device 8 is adjusted respectively according to the exhaust gas superheat of the impellers of the first compressor 1 and the second compressor 2.

[0138] In this embodiment, by monitoring the exhaust superheat of the first compressor 1 and the second compressor 2, and targetedly cooling the impellers of the compressors by spraying liquid 1, the heat generated during the compression process can be reduced, the energy loss caused by the temperature increase can be reduced, the compression efficiency can be improved, the exhaust of the compressors can be kept at an appropriate superheat, and the amount of water vapor produced can be maintained within an appropriate range, making the compression process more efficient and stable.

[0139] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0140] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A compressor system, characterized in that: include: A first compressor (1) and a second compressor (2) connected in series; a heating device (3), connected to the first compressor (1) and the second compressor (2), respectively, and configured to heat steam; an on-off valve (4) disposed between the exhaust port of the first compressor (1) and the heating device (3); and A controller (5) is connected to the on-off valve (4) by signal and is configured to switch the on-off valve (4) according to an external heating demand, so that when the on-off valve (4) is on, the first compressor (1) alone forms a first heating circuit with the heating device (3), and when the on-off valve (4) is off, the first compressor (1) and the second compressor (2) together form a second heating circuit with the heating device (3).

2. The compressor system according to claim 1, characterized in that Also includes: A first detection device (61) is configured to obtain an intake pressure and a boost pressure of the first compressor (1); The controller (5) is signal-connected to the first compressor (1), the second compressor (2) and the first detection device (61), and the controller (5) is further configured as follows: In response to the sum of the intake pressure and the boost pressure of the first compressor (1) being greater than or equal to a preset pressure, the first compressor (1) alone forms a first heating circuit with the heating device (3) so that the first compressor (1) operates independently; as well as In response to the sum of the intake pressure and the boost pressure of the first compressor (1) being less than a preset pressure, the first compressor (1) and the second compressor (2) together with the heating device (3) form a second heating circuit so that the first compressor (1) and the second compressor (2) operate in series.

3. The compressor system according to claim 2, characterized in that Also includes: a first exhaust valve (71) disposed between an exhaust port of the first compressor (1) and an intake port of the second compressor (2); and a second exhaust valve (72) disposed between an exhaust port of the second compressor (2) and the heating device (3); The controller (5) is signal-connected to the first exhaust valve (71) and the second exhaust valve (72), and the controller (5) is further configured as follows: In response to the sum of the intake pressure and the boost pressure of the first compressor (1) being greater than or equal to a preset pressure, closing the first exhaust valve (71) and the second exhaust valve (72); as well as In response to the sum of the intake pressure and the boost pressure of the first compressor (1) being less than a preset pressure, the first exhaust valve (71) and the second exhaust valve (72) are opened.

4. The compressor system according to claim 1, wherein: Also includes: a cooling device (8), connected to the first compressor (1) and the second compressor (2), and configured to provide cooling liquid to the impellers of the first compressor (1) and the second compressor (2), respectively; a regulating valve group (9), arranged in a coolant supply pipeline between the cooling device (8) and the first compressor (1) and the second compressor (2), and configured to regulate the flow of the coolant; and A second detection device (62) is configured to respectively obtain exhaust gas superheat of the impellers of the first compressor (1) and the second compressor (2); The controller (5) is signal-connected to the regulating valve group (9) and the second detection device (62), and is configured to adjust the coolant flow rate provided by the cooling device (8) according to the exhaust superheat of the impellers of the first compressor (1) and the second compressor (2).

5. The compressor system according to claim 4, characterized in that The first compressor (1) comprises a first motor (11), a first impeller (12) and a second impeller (13), wherein the first impeller (12) and the second impeller (13) are respectively arranged on both sides of the first motor (11); The second compressor (2) comprises a second motor (21), a third impeller (22) and a fourth impeller (23); the third impeller (22) and the fourth impeller (23) are respectively arranged on both sides of the second motor (21).

6. The compressor system according to claim 5, characterized in that The cooling device (8) is respectively connected to the first impeller (12), the second impeller (13), the third impeller (22) and the fourth impeller (23); Wherein, the regulating valve group (9) comprises: a first water supply valve (91), arranged between the cooling device (8) and the first impeller (12), and configured to adjust the flow rate of coolant provided by the cooling device (8) to the first impeller (12); a second water supply valve (92), arranged between the cooling device (8) and the second impeller (13), and configured to adjust the flow rate of coolant provided by the cooling device (8) to the second impeller (13); a third water supply valve (93), disposed between the cooling device (8) and the third impeller (22), and configured to adjust the flow rate of coolant provided by the cooling device (8) to the third impeller (22); and a fourth water supply valve (94), arranged between the cooling device (8) and the fourth impeller (23), and configured to adjust the flow rate of coolant provided by the cooling device (8) to the fourth impeller (23); The second detection device (62) is configured to respectively obtain the exhaust gas superheat of the first impeller (12), the second impeller (13), the third impeller (22) and the fourth impeller (23); The controller (5) is further configured to adjust the opening of the first water supply valve (91) according to the exhaust gas superheat of the first impeller (12), adjust the opening of the second water supply valve (92) according to the exhaust gas superheat of the second impeller (13), adjust the opening of the third water supply valve (93) according to the exhaust gas superheat of the third impeller (22), and adjust the opening of the fourth water supply valve (94) according to the exhaust gas superheat of the fourth impeller (23).

7. The compressor system according to claim 5, characterized in that The first compressor (1) further comprises a first air suspension bearing (14), wherein the first air suspension bearing (14) is arranged at two ends of the first motor (11); The second compressor (2) further comprises a second air suspension bearing (24), wherein the second air suspension bearing (24) is arranged at two ends of the second motor (21).

8. The compressor system according to any one of claims 1 to 7, characterized in that: The first compressor (1) and the second compressor (2) are centrifugal compressors.

9. A water vapor compression device, characterized in that: include: A compressor system as claimed in any one of claims 1 to 8.

10. A control method for a compressor system according to any one of claims 1 to 8, characterized in that: include: Obtain external heating requirements; The on-off valve (4) is switched on and off according to an external heating demand, so that when the on-off valve (4) is on, the first compressor (1) alone forms a first heating circuit with the heating device (3), and when the on-off valve (4) is off, the first compressor (1) and the second compressor (2) together form a second heating circuit with the heating device (3).

11. The control method according to claim 10, characterized in that: Switching the on-off valve (4) on and off according to an external heating demand, so that when the on-off valve (4) is on, the first compressor (1) alone forms a first heating circuit with the heating device (3), and when the on-off valve (4) is off, the first compressor (1) and the second compressor (2) together form a second heating circuit with the heating device (3), specifically comprises: In response to the sum of the intake pressure and the boost pressure of the first compressor (1) being greater than or equal to a preset pressure, the first compressor (1) alone forms a first heating circuit with the heating device (3) so that the first compressor (1) operates independently; and In response to the sum of the intake pressure and the boost pressure of the first compressor (1) being less than a preset pressure, the first compressor (1) and the second compressor (2) together with the heating device (3) form a second heating circuit so that the first compressor (1) and the second compressor (2) operate in series.

12. The control method according to claim 10, characterized in that: The compressor system further comprises a cooling device (8), wherein the cooling device (8) is respectively connected to the impellers of the first compressor (1) and the second compressor (2), and is configured to respectively provide cooling liquid to the impellers of the first compressor (1) and the second compressor (2); Wherein, the control method further includes: respectively obtaining exhaust gas superheat of the impellers of the first compressor (1) and the second compressor (2); The flow rates of coolant provided by the cooling device (8) are adjusted respectively according to the exhaust gas superheat of the impellers of the first compressor (1) and the second compressor (2).

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