Ammonia refrigeration compressor unit and ammonia refrigeration system

Abstract

The embodiment of the application discloses an ammonia refrigeration compressor unit and an ammonia refrigeration system. The ammonia refrigeration compressor unit comprises a compressor, a first-stage gas inlet path connected with an ammonia gas supply assembly and the compressor, low-temperature and low-pressure ammonia gas being capable of entering the compressor through the first-stage gas inlet path to form first-stage compressed ammonia gas, a gas feeding path connected with the ammonia gas supply assembly and the compressor, low-temperature and low-pressure ammonia gas being capable of entering the compressor through the gas feeding path and being mixed with the first-stage compressed ammonia gas to obtain second-stage compressed ammonia gas, a gas outlet path connected with the compressor, the second-stage compressed ammonia gas being capable of being discharged from the ammonia refrigeration compressor unit through the gas outlet path, an anti-surge path arranged between the first-stage gas inlet path and the gas outlet path, the anti-surge path being capable of sending the second-stage compressed ammonia gas into the first-stage gas inlet path when the compressor surges, and a cooling pipeline for introducing liquid ammonia in a liquid ammonia supply assembly into the anti-surge path to cool the second-stage compressed ammonia gas in the anti-surge path.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and in particular to an ammonia refrigeration compressor unit and an ammonia refrigeration system. Background Technology

[0002] Ammonia refrigeration systems are commonly used to produce low-temperature chilled water, brine, or directly provide cooling energy to production equipment. The compressor is an indispensable component in such systems. The compressor compresses low-temperature, low-pressure ammonia gas into high-temperature, high-pressure ammonia gas and delivers the resulting gas to downstream equipment. However, during compressor operation, surge may occur due to insufficient intake flow or excessive internal pressure. Therefore, anti-surge circuits can be incorporated into ammonia refrigeration compressor units to prevent surge. In related technologies, the number of anti-surge circuits is often the same as the number of compressor intake circuits, making the compressor's anti-surge circuitry quite complex. Summary of the Invention

[0003] This application discloses an ammonia refrigeration compressor unit and an ammonia refrigeration system. By setting only one anti-surge circuit in the ammonia refrigeration compressor unit and introducing liquid ammonia into the anti-surge circuit to cool the gas in the anti-surge circuit, the complexity of the anti-surge circuit is reduced.

[0004] To achieve the above objectives, in a first aspect, embodiments of this application disclose an ammonia refrigeration compressor unit, disposed in an ammonia refrigeration system. The ammonia refrigeration system further includes an ammonia gas supply component and a liquid ammonia supply component. The ammonia gas supply component is capable of outputting low-temperature, low-pressure ammonia gas. The ammonia refrigeration compressor unit includes: compressor; An intake air passage is connected to the ammonia supply component and the compressor, and the low-temperature, low-pressure ammonia can enter the compressor through the intake air passage to form a compressed ammonia. A gas filling path is connected to the ammonia supply component and the compressor. The low-temperature, low-pressure ammonia can enter the compressor through the gas filling path and mix with the first-stage compressed ammonia to obtain second-stage compressed ammonia. The outlet gas path is connected to the compressor, and the second-stage compressed ammonia gas can be discharged from the ammonia refrigeration compressor unit through the outlet gas path. An anti-surge air passage is provided between the first-stage inlet air passage and the first-stage outlet air passage. When the compressor experiences surge, the anti-surge air passage can send the second-stage compressed ammonia gas into the first-stage inlet air passage. A cooling pipeline is installed between the liquid ammonia supply component and the anti-surge gas path. The cooling pipeline is used to introduce liquid ammonia from the liquid ammonia supply component into the anti-surge gas path to cool the second-stage compressed ammonia gas in the anti-surge gas path.

[0005] In one possible implementation, the anti-surge air path includes: A return gas pipe, wherein the inlet of the return gas pipe is connected to the outlet gas path, and the outlet of the return gas pipe is connected to the section of the inlet gas path. An anti-surge valve is installed in the return gas pipeline. When the compressor experiences surge, the anti-surge valve opens to allow the second-stage compressed ammonia gas in the outlet gas path to flow back to the first-stage inlet gas path.

[0006] In one possible implementation, the cooling conduit includes: The cooling pipe has a first port connected to the liquid ammonia supply component and a second port connected to the return gas pipe. The second port of the cooling pipe is located between the first section of the air intake passage and the anti-surge valve. A temperature control valve is installed in the cooling pipe. The temperature control valve can open when the temperature in the anti-surge air circuit reaches a predetermined temperature.

[0007] In one possible implementation, the compressor includes: The first air inlet is connected to the first air inlet passage. The low-temperature, low-pressure ammonia gas enters the compressor through the first air inlet and completes a first compression, thereby forming a first compressed ammonia gas. The second air inlet is connected to the gas supply line. The low-temperature, low-pressure ammonia gas enters the compressor through the second air inlet and mixes with the first-stage compressed ammonia gas in the compressor to form a mixed gas. Then the compressor compresses the mixed gas to obtain second-stage compressed ammonia gas. The outlet is connected to the outlet gas path, and the second-stage compressed ammonia gas flows out of the compressor through the outlet.

[0008] In one possible implementation, the intake air passage includes: An intake pipe is connected to the ammonia supply assembly and the first intake port; A return air port is provided in the section of the air inlet pipe, and the return air port is connected to the air outlet of the return air pipe; A gas data monitoring component is installed in the gas inlet pipe, and the gas data monitoring component is located between the gas return port and the compressor.

[0009] In one possible implementation, the gas data monitoring component includes: A first temperature monitoring element is installed in the aforementioned section of the air intake pipe; A first pressure monitoring element is disposed in the intake pipe section, and the first pressure monitoring element is farther away from the compressor than the first temperature monitoring element; A first flow monitoring element is disposed in the section of the air intake pipe, and the first flow monitoring element is located between the first temperature monitoring element and the first pressure monitoring element.

[0010] In one possible implementation, the gas refueling path includes: A gas supply pipeline is connected to the ammonia supply assembly and the second gas inlet; A gas refueling data monitoring component is installed in the gas refueling pipeline, and the gas refueling data monitoring component includes: A second temperature monitoring element is installed in the gas filling pipeline; A second pressure monitoring element is disposed in the gas filling pipeline, and the second pressure monitoring element is farther away from the compressor than the second temperature monitoring element.

[0011] In one possible implementation, the outlet air path includes: An air outlet pipe is connected to the air outlet; A pressure relief port is provided in the outlet pipe, and the pressure relief port is connected to the inlet of the return pipe; An exhaust gas data monitoring component is installed in the exhaust pipe, and the exhaust gas data monitoring component is located between the compressor and the pressure relief port.

[0012] In one possible implementation, the exhaust gas data monitoring component includes: A third temperature monitoring element is installed in the air outlet pipe; A third pressure monitoring element is disposed in the outlet pipe, and the third pressure monitoring element is closer to the compressor than the third temperature monitoring element; A second flow monitoring element is disposed in the outlet pipe, and the second flow monitoring element is located between the third temperature monitoring element and the third pressure monitoring element.

[0013] Secondly, embodiments of this application provide an ammonia refrigeration system, including an ammonia supply component, a liquid ammonia supply component, and an ammonia refrigeration compressor unit as described in any one of the first aspects above. The liquid ammonia supply component is capable of supplying liquid ammonia to the ammonia refrigeration compressor unit, and the ammonia supply component is capable of supplying low-temperature, low-pressure ammonia to the ammonia refrigeration compressor unit.

[0014] Thus, the ammonia refrigeration compressor unit provided in this application embodiment, by setting up an anti-surge gas path connecting a first-stage inlet gas path and an outlet gas path, can promptly return the high-temperature, high-pressure second-stage compressed ammonia gas to the first-stage inlet gas path when the compressor experiences surge. This reduces the outlet pressure and increases the inlet flow rate, thereby effectively suppressing surge, extending the compressor's service life, and improving operational safety. Simultaneously, the addition of a cooling pipeline connected to the liquid ammonia supply component allows for automatic cooling and depressurization of the returned high-temperature ammonia gas during the anti-surge process, ensuring that the ammonia gas entering the compressor is at a suitable temperature and preventing secondary problems caused by excessively high temperatures. This ensures the stable, safe, and efficient operation of the ammonia refrigeration system's compression system. Furthermore, unlike conventional designs where the number of anti-surge gas paths and inlet gas paths are the same, the ammonia refrigeration compressor unit in this application embodiment only has one anti-surge gas path. This simplifies the control process of the ammonia refrigeration compressor unit's controller when surge occurs, reduces the investment and subsequent maintenance costs of the ammonia refrigeration compressor unit, and simultaneously improves the controller's response speed and control accuracy.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is one of the structural schematic diagrams of an ammonia refrigeration compressor unit provided in an embodiment of this application; Figure 2 This is a second schematic diagram of an ammonia refrigeration compressor unit provided in an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: 10-Ammonia Refrigeration Compressor Unit, 101-Compressor, 1011-First Inlet, 1012-Second Inlet, 1013-Outlet, 102-First Inlet Gas Path, 1021-First Inlet Pipe, 1022-Return Inlet, 1023-First Gas Data Monitoring Component, 1024-First Temperature Monitoring Element, 1025-First Pressure Monitoring Element, 1026-First Flow Monitoring Element, 103-Gas Filling Path, 1031-Gas Filling Pipe, 1032-Gas Filling Gas Data Monitoring Component Components: 1033-Second temperature monitoring element, 1034-Second pressure monitoring element, 104-Outlet gas path, 1041-Outlet gas pipe, 1042-Pressure relief port, 1043-Outlet gas data monitoring component, 1044-Third temperature monitoring element, 1045-Third pressure monitoring element, 1046-Second flow monitoring element, 105-Anti-surge gas path, 1051-Return gas pipe, 1052-Anti-surge valve, 106-Cooling pipe, 1061-Cooling pipe, 1062-Temperature control valve. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0022] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0024] An ammonia refrigeration system is an independent workshop that uses ammonia as a refrigerant to provide cooling for factories or large facilities. The core task of an ammonia refrigeration system is to stably produce low-temperature chilled water, brine, or directly provide cooling energy to production equipment to meet the process cooling or refrigeration needs of industries such as chemical, food, and pharmaceutical. During the operation of the ammonia refrigeration system, compressor 101 is used to compress low-temperature, low-pressure ammonia gas into high-temperature, high-pressure ammonia gas. However, due to the operating characteristics of compressor 101, surge is prone to occur when the inlet flow rate of compressor 101 is insufficient or the internal pressure of compressor 101 is too high. Frequent surge of compressor 101 not only affects its service life but may also threaten the safety of personnel. Therefore, this application provides an ammonia refrigeration compressor unit 10 to solve the problem of surge that easily occurs during the operation of compressor 101. The ammonia refrigeration compressor unit 10 provided in this application is installed in an ammonia refrigeration system. The ammonia refrigeration system also includes an ammonia gas supply component and a liquid ammonia supply component. The ammonia gas supply component can output low-temperature, low-pressure ammonia gas.

[0025] Please refer to Figure 1 and Figure 2 The ammonia refrigeration compressor unit 10 includes a compressor 101 and an inlet gas passage 102. The inlet gas passage 102 is connected to the ammonia supply assembly and the compressor 101, and low-temperature, low-pressure ammonia can enter the compressor 101 through the inlet gas passage 102 to form compressed ammonia.

[0026] The ammonia refrigeration compressor unit 10 includes a gas filling passage 103. The gas filling passage 103 is connected to the ammonia supply component and the compressor 101. Low-temperature, low-pressure ammonia can enter the compressor 101 through the gas filling passage 103 and mix with the first-stage compressed ammonia to obtain the second-stage compressed ammonia.

[0027] The ammonia refrigeration compressor unit 10 includes an outlet gas passage 104. The outlet gas passage 104 is connected to the compressor 101, and the ammonia gas compressed in the second stage can be discharged from the ammonia refrigeration compressor unit 10 through the outlet gas passage 104.

[0028] The ammonia refrigeration compressor unit 10 includes an anti-surge gas passage 105. The anti-surge gas passage 105 is located between a first-stage inlet gas passage 102 and an outlet gas passage 104. When the compressor 101 experiences surge, the anti-surge gas passage 105 can send the second-stage compressed ammonia gas into the first-stage inlet gas passage 102.

[0029] The ammonia refrigeration compressor unit 10 includes a cooling line 106. The cooling line 106 is located between the liquid ammonia supply component and the anti-surge gas path 105. The cooling line 106 is used to introduce liquid ammonia from the liquid ammonia supply component into the anti-surge gas path 105 to cool the second-stage compressed ammonia gas in the anti-surge gas path 105.

[0030] Specifically, when the compressor 101 is operating normally, a portion of low-temperature, low-pressure ammonia from the ammonia supply component first enters the compressor 101 through an inlet gas path 102. The compressor 101 compresses this portion of low-temperature, low-pressure ammonia to form a first-stage compressed ammonia. Then, another portion of low-temperature, low-pressure ammonia from the same ammonia supply component enters the compressor 101 through a gas filling path 103 and mixes with the first-stage compressed ammonia formed in the compressor 101 to form a mixed gas. The compressor 101 then compresses this mixed gas to obtain a second-stage compressed ammonia at high temperature and high pressure. The second-stage compressed ammonia flows to subsequent equipment through an outlet gas path 104.

[0031] When compressor 101 experiences surge, while the second-stage compressed ammonia flows to downstream equipment through outlet gas path 104, the controller in ammonia refrigeration compressor unit 10 controls the anti-surge valve 1052 to open, allowing the second-stage compressed ammonia to flow to anti-surge gas path 105. After entering anti-surge gas path 105, the second-stage compressed ammonia can flow back to the first-stage gas filling gas path 103. This reduces the outlet pressure of ammonia refrigeration compressor unit 10 while increasing the inlet flow rate of the first-stage gas filling gas path 103 in ammonia refrigeration compressor unit 10, thereby achieving the effect of anti-surge.

[0032] Because the temperature and pressure of the ammonia gas in the second stage of compression are both relatively high, and the ammonia gas entering the compressor 101 from the first-stage inlet gas path 102 is low-temperature and low-pressure ammonia gas, the second-stage compressed ammonia gas drawn from the outlet gas path 104 needs to be cooled before it can flow back into the compressor 101. In view of this, the ammonia refrigeration compressor unit 10 provided in this embodiment of the application is also provided with a cooling pipeline 106, one end of which is connected to the liquid ammonia supply component, and the other end is connected to the anti-surge gas path 105. When too much secondary compressed ammonia flows into the anti-surge gas path 105, the temperature in the anti-surge gas path 105 will rise sharply. After flowing into the primary intake gas path 102, the temperature of the ammonia in the primary intake gas path 102 will also rise. At this time, the cooling pipeline 106 can automatically introduce liquid ammonia from the liquid ammonia supply component based on the excessively high temperature of the primary gas inlet to cool and depressurize the secondary compressed ammonia in the anti-surge gas path 105, thereby ensuring that the temperature of the ammonia entering the compressor 101 is within a suitable range.

[0033] Thus, the ammonia refrigeration compressor unit 10 provided in this application embodiment, by setting an anti-surge air passage 105 connecting the first-stage inlet air passage 102 and the outlet air passage 104, can promptly return the high-temperature and high-pressure second-stage compressed ammonia gas to the first-stage inlet air passage 102 when surge occurs in the compressor 101. This reduces the outlet pressure and increases the inlet flow rate, thereby effectively suppressing the surge phenomenon, extending the service life of the compressor 101, and improving operational safety. At the same time, a cooling pipeline 106 connected to the liquid ammonia supply component is added, which can automatically cool and depressurize the returned high-temperature ammonia gas during the anti-surge process, ensuring that the temperature of the ammonia gas entering the compressor 101 is suitable and avoiding secondary problems caused by excessive temperature, thereby ensuring the stable, safe, and efficient operation of the ammonia refrigeration system compression system. Furthermore, unlike conventional designs where the number of anti-surge air paths 105 and intake air paths are the same, the ammonia refrigeration compressor unit 10 in this embodiment of the application only has one anti-surge air path 105. This simplifies the control process of the controller of the ammonia refrigeration compressor unit 10 when surge occurs, reduces the investment and subsequent maintenance costs of the ammonia refrigeration compressor unit 10, and at the same time improves the controller's response speed and control accuracy.

[0034] In some embodiments, the anti-surge air passage 105 includes a return air passage 1051. The inlet of the return air passage 1051 is connected to the outlet air passage 104, and the outlet 1013 of the return air passage 1051 is connected to an inlet air passage 102.

[0035] The inlet of the return gas pipe 1051 is connected to the outlet gas passage 104, allowing the second-stage compressed ammonia gas to flow from the outlet gas passage 104 to the return gas pipe 1051, thereby reducing the outlet pressure of the compressor 101 and alleviating the surge phenomenon of the compressor 101. The outlet 1013 of the return gas pipe 1051 is connected to the first-stage inlet gas passage 102, allowing the second-stage compressed ammonia gas in the return gas pipe 1051 to flow back to the first-stage inlet gas passage 102, thereby increasing the flow rate of the first-stage inlet gas passage 102 and alleviating the surge phenomenon of the compressor 101.

[0036] The anti-surge air passage 105 includes an anti-surge valve 1052. The anti-surge valve 1052 is located in the return air passage 1051. When the compressor 101 experiences surge, the anti-surge valve 1052 opens to allow the second-stage compressed ammonia gas in the outlet air passage 104 to flow back to the first-stage inlet air passage 102.

[0037] An anti-surge valve 1052 is installed on the return gas pipe 1051 and is communicatively connected to the controller of the ammonia refrigeration compressor unit 10. When the compressor 101 is operating normally, the anti-surge valve 1052 remains closed; when the compressor 101 experiences surge, the controller can control the anti-surge valve 1052 to open, thereby reducing the outlet pressure of the compressor 101 and increasing the inlet flow of the compressor 101, thus alleviating the surge.

[0038] The above embodiment, by setting up an anti-surge gas path 105 including a return gas pipe 1051 and an anti-surge valve 1052, can quickly open the anti-surge valve 1052 when the compressor 101 experiences surge, allowing some of the second-stage compressed ammonia gas to flow back from the outlet gas path 104 through the return gas pipe 1051 to the first-stage inlet gas path 102. This effectively increases the inlet flow while reducing the outlet pressure of the compressor 101, thereby alleviating the surge phenomenon, reducing the risk of damage to the compressor 101 due to surge, and ensuring the long-term stable operation of the equipment and the safety of the operators. The design of a single anti-surge gas path 105 effectively simplifies the number of pipelines in the ammonia refrigeration compressor unit 10, reduces the construction cost and maintenance difficulty of the ammonia refrigeration compressor unit 10, and also simplifies the calculation process of the controller, indirectly improving the control accuracy and response speed of the controller.

[0039] In some embodiments, the cooling pipeline 106 includes a cooling pipe 1061. A first port of the cooling pipe 1061 is connected to a liquid ammonia supply assembly, and a second port of the cooling pipe 1061 is connected to a return gas pipe 1051. The second port of the cooling pipe 1061 is located between an intake gas passage 102 and an anti-surge valve 1052.

[0040] The first port of the cooling pipe 1061 is connected to the liquid ammonia supply component so that liquid ammonia in the liquid ammonia supply component can flow into the cooling pipe 1061. The second port of the cooling pipe 1061 is connected to the return gas pipe 1051 so that liquid ammonia can mix with the second-stage compressed ammonia gas in the return gas pipe 1051, thereby reducing the temperature of the second-stage compressed gas.

[0041] The cooling pipeline 106 includes a temperature control valve 1062. The temperature control valve 1062 is installed in the cooling pipeline 1061 and can open when the temperature in the anti-surge air passage 105 reaches a predetermined temperature.

[0042] A temperature control valve 1062 is installed on the cooling pipe 1061, and the temperature control valve 1062 is communicatively connected to the controller of the ammonia refrigeration compressor unit 10. When a large amount of second-stage compressed ammonia flows into the anti-surge gas path 105, this second-stage compressed ammonia flows back to the first-stage intake gas path 102 and mixes with the low-temperature, low-pressure ammonia obtained from the ammonia supply component in the first-stage intake gas path 102. This causes the temperature of the ammonia entering the compressor 101 from the first-stage gas filling gas path 103 to increase, affecting the normal operation of the compressor 101. At this time, the controller can open based on the ammonia temperature in the first-stage intake gas path 102 being higher than the preset temperature, using liquid ammonia to cool the second-stage compressed ammonia in the return gas pipe 1051, thereby maintaining the ammonia temperature in the first-stage intake gas path 102 below the preset temperature.

[0043] The above embodiment introduces liquid ammonia from the liquid ammonia supply component into the return gas pipeline 1051 by setting up a cooling pipeline 106 including a cooling pipeline 1061 and a temperature control valve 1062, and directly mixes the liquid ammonia with the returning second-stage compressed ammonia gas to cool it down, thereby effectively reducing the temperature of the ammonia gas in the return gas pipeline 1051; the temperature control valve 1062 can automatically open according to the temperature in the anti-surge gas path 105 or the first-stage intake gas path 102, ensuring that liquid ammonia is introduced for cooling only when necessary, which not only prevents the problem of excessive ammonia temperature at the compressor 101 inlet due to excessively high return gas temperature, affecting compression efficiency or safety, but also avoids unnecessary liquid ammonia consumption, further improving the stability and reliability of the ammonia refrigeration compressor unit 10 under anti-surge conditions.

[0044] In some embodiments, the compressor 101 includes a first air inlet 1011. The first air inlet 1011 is connected to an air intake passage 102. Low-temperature, low-pressure ammonia gas enters the compressor 101 through the first air inlet 1011 and undergoes a compression process to form compressed ammonia gas.

[0045] The compressor 101 includes a second air inlet 1012. The second air inlet 1012 is connected to the gas supply line 103. Low-temperature and low-pressure ammonia gas enters the compressor 101 through the second air inlet 1012 and mixes with the first-stage compressed ammonia gas in the compressor 101 to form a mixed gas. Then, the compressor 101 compresses the mixed gas to obtain second-stage compressed ammonia gas.

[0046] The compressor 101 includes an outlet 1013. The outlet 1013 is connected to the outlet gas passage 104, and the second-stage compressed ammonia gas flows out of the compressor 101 through the outlet 1013.

[0047] Since the ammonia refrigeration compressor unit 10 provided in this application embodiment has a two-stage compression process, the compressor 101 needs to have two air inlets. The first air inlet 1011 is connected to a first-stage air intake passage 102, and the ammonia gas in the first-stage air intake passage 102 enters the compressor 101 through the first air inlet 1011. The second air inlet 1012 is connected to a gas filling passage 103, and the low-temperature, low-pressure ammonia gas in the gas filling passage 103 can enter the compressor 101 through the second air inlet 1012. The compressor 101 can mix the first-stage compressed ammonia gas formed by compressing the ammonia gas entering the compressor 101 through the first-stage air intake passage 102 with the ammonia gas entering the compressor 101 through the gas filling passage 103 to form a mixed gas. Then, the compressor 101 compresses the mixed gas again to form a second-stage compressed ammonia gas. The ammonia gas formed in the compressor 101 in two stages can flow from the outlet 1013 of the compressor 101 to the outlet gas path 104, and then flow to the downstream equipment through the outlet gas path 104. When the compressor 101 experiences surge, a portion of the ammonia gas in the two stages can also flow from the outlet gas path 104 to the anti-surge gas path 105, thereby alleviating the surge of the compressor 101.

[0048] In the above embodiment, the compressor 101 connects to a first intake air passage 102 via the first intake port 1011, to a filling air passage 103 via the second intake port 1012, and to an outlet air passage 104 via the outlet port 1013, thus achieving two-stage compression of ammonia. This ensures efficient staged compression of the compressor 101 during normal operation. When the compressor 101 experiences surge, some of the second-stage compressed ammonia can be smoothly introduced from the outlet port 1013 through the outlet air passage 104 into the anti-surge air passage 105 and then flow back to the first intake air passage 102, thereby quickly alleviating the surge phenomenon. This improves the operational flexibility of the ammonia refrigeration compressor unit 10 while ensuring the functional integrity of the ammonia refrigeration compressor unit 10.

[0049] In some embodiments, an intake air passage 102 includes an intake pipe 1021. The intake pipe 1021 is connected to the ammonia supply assembly and the first intake port 1011.

[0050] An intake air passage 102 includes a return air port 1022. The return air port 1022 is located in an intake air pipe 1021 and is connected to the outlet 1013 of the return air pipe 1051.

[0051] An intake air passage 102 includes a gas data monitoring component 1023. The gas data monitoring component 1023 is disposed in an intake pipe 1021 and is located between the return air port 1022 and the compressor 101.

[0052] Specifically, the inlet of an intake pipe 1021 is connected to an ammonia supply assembly, and the outlet 1013 of the intake pipe 1021 is connected to the first intake port 1011 of the compressor 101. A return port 1022 is provided on the intake pipe 1021, and the return port 1022 is connected to the outlet 1013 of the return pipe 1051. A gas data monitoring assembly 1023 is installed between the outlet 1013 and the return port 1022 of the intake pipe 1021 to monitor the temperature, pressure, and flow rate of the ammonia entering the compressor 101. The gas data monitoring assembly 1023 is communicatively connected to the controller of the ammonia refrigeration compressor unit 10. The controller can determine the real-time status of the ammonia entering the compressor 101 based on the gas data monitoring assembly 1023, preventing problems such as excessively high temperature, excessively high pressure, or insufficient flow rate of the ammonia entering the compressor 101 from affecting the normal operation of the compressor 101.

[0053] In the above embodiment, by setting a return gas port 1022 on a section of the inlet pipe 1021 to connect to the return gas pipe 1051, and setting a gas data monitoring component 1023 between the return gas port 1022 and the compressor 101, real-time monitoring of the temperature, pressure, and flow rate of ammonia entering the compressor 101 is achieved. The data acquired by the gas data monitoring component 1023 can be uploaded to the controller, thereby enabling the controller to promptly grasp the inlet status of the compressor 101. This provides a reliable basis for anti-surge control and adjustment of the temperature control valve 1062, and also avoids the compressor 101 from operating normally due to excessively high ammonia temperature, excessively high pressure, or excessively low flow rate, thereby improving the intelligent monitoring level and operational safety of the ammonia refrigeration compressor unit 10.

[0054] In some embodiments, a gas data monitoring assembly 1023 includes a first temperature monitoring element 1024. The first temperature monitoring element 1024 is disposed in an intake duct 1021.

[0055] A gas data monitoring component 1023 includes a first pressure monitoring element 1025. The first pressure monitoring element 1025 is disposed in an intake pipe 1021 and is located away from the compressor 101 relative to the first temperature monitoring element 1024.

[0056] A gas data monitoring component 1023 includes a first flow monitoring element 1026. The first flow monitoring element 1026 is disposed in an intake pipe 1021 and is located between a first temperature detection element and a first pressure monitoring element 1025.

[0057] Specifically, the gas entering the compressor 101 through the first intake gas path 102 is designated as the first-stage gas. The first temperature monitoring element 1024 and the first pressure monitoring element 1025 are communicatively connected to the controller of the ammonia refrigeration compressor unit 10, thereby monitoring the temperature, pressure, and flow rate of the first-stage gas in real time. This ensures that the temperature and pressure of the first-stage gas are within a suitable range before entering the compressor 101, thus preventing a reduction in the service life of the compressor 101 due to excessively high temperatures or pressures in the first-stage gas. The controller can also open the temperature control valve 1062 if the first temperature data obtained by the first temperature monitoring element 1024 is higher than a preset temperature, introducing liquid ammonia to cool the second-stage compressed ammonia gas in the anti-surge gas path 105. The first flow monitoring element 1026 can monitor the flow rate of the first-stage gas in real time, enabling the controller to respond promptly when the flow rate of the first-stage gas is too low, preventing surge in the compressor 101 caused by insufficient flow rate.

[0058] In the above embodiment, by installing a first temperature monitoring element 1024, a first pressure monitoring element 1025, and a first flow monitoring element 1026 in a first-stage intake pipe 1021, real-time monitoring of the temperature, pressure, and flow rate of the first-stage gas entering the compressor 101 is achieved. Simultaneously, the controller can determine the operating state of the temperature control valve 1062 based on the first temperature data. When the compressor 101 experiences severe surge and excessive secondary compressed ammonia gas flows back from the anti-surge circuit to the first-stage intake gas path 102, the controller promptly controls the temperature control valve 1062 to open, thereby introducing liquid ammonia into the anti-surge circuit to cool the secondary compressed ammonia gas in the anti-surge circuit. The first flow data acquired by the first flow monitoring element 1026 reflects the flow rate of the first-stage gas. The controller can provide early warnings of surge risks based on the first flow data and ensure that the gas state is within a reasonable range based on the first temperature and first pressure data. This effectively avoids shortened compressor 101 lifespan or surge failure caused by abnormal parameters of the first-stage gas, thereby enhancing the system's active protection capability and operational reliability.

[0059] In some embodiments, the gas supply line 103 includes a gas supply pipe 1031. The gas supply pipe 1031 is connected to an ammonia supply assembly and a second gas inlet 1012.

[0060] The gas filling line 103 includes a gas filling data monitoring component 1032, which is disposed in the gas filling pipeline 1031. The gas filling data monitoring component 1032 includes a second temperature monitoring element 1033, which is disposed in the gas filling pipeline 1031.

[0061] The gas data monitoring component 1032 includes a second pressure monitoring element 1034. The second pressure monitoring element 1034 is disposed in the gas filling pipeline 1031 and is located further away from the compressor 101 than the second temperature monitoring element 1033.

[0062] The inlet of the gas filling pipe 1031 is connected to the ammonia supply assembly, and the outlet 1013 of the gas filling pipe 1031 is connected to the second inlet 1012 of the compressor 101. The low-temperature, low-pressure ammonia gas entering the compressor 101 via the gas filling passage 103 is named the gas filling gas. The gas filling gas enters the compressor 101 through the gas filling pipe 1031 and can mix with a section of compressed ammonia gas in the compressor 101. The gas filling pipe 1031 is also equipped with a gas filling gas data monitoring assembly 1032, which includes a second temperature monitoring element 1033 and a second pressure monitoring element 1034. Since the compressor 101 in the ammonia refrigeration compressor unit 10 provided in this application embodiment is a two-stage compressor and only has one anti-surge circuit, which is only connected to a section of the intake gas path 102, the flow rate of the gas being added in the gas filling pipeline 1031 can be calculated. Therefore, a flow monitoring element does not need to be installed in the gas filling pipeline 103, thereby reducing the hardware cost and complexity of the ammonia refrigeration compressor unit 10. The controller is communicatively connected to the second temperature monitoring element 1033 and the second pressure monitoring element 1034. The controller can determine the operating status of the compressor 101 by combining the data obtained from the gas data monitoring component 1023 and the gas filling gas data monitoring component 1032, thereby playing a certain role in preventing the compressor 101 from surging.

[0063] In some embodiments, the air outlet path 104 includes an air outlet pipe 1041. The air outlet pipe 1041 is connected to the air outlet 1013.

[0064] The exhaust gas path 104 includes a pressure relief port 1042. The pressure relief port 1042 is located in the exhaust gas pipe 1041 and is connected to the air inlet of the return gas pipe 1051.

[0065] The outlet gas path 104 includes an outlet gas data monitoring component 1043. The outlet gas data monitoring component 1043 is disposed in the outlet pipe 1041 and is located between the compressor 101 and the pressure relief port 1042.

[0066] The inlet end of the outlet pipe 1041 is connected to the outlet port 1013 of the compressor 101. The outlet end of the outlet pipe 1041 can be connected to cooling equipment such as the condenser in the ammonia refrigeration system or equipment that needs to absorb heat, so as to convert the second-stage compressed ammonia back into liquid ammonia for subsequent use. A pressure relief port 1042 and an outlet gas data monitoring component 1043 are provided in the outlet gas path 104. The outlet gas data monitoring component 1043 is closer to the outlet port 1013 of the compressor 101 than the pressure relief port 1042, thereby ensuring the accuracy of the gas data about the second-stage compressed ammonia acquired by the outlet gas data monitoring component 1043. The pressure relief port 1042 is connected to the air inlet of the air outlet pipe 1041. When the compressor 101 experiences surge, the controller controls the anti-surge valve 1052 to open, and part of the second-stage compressed ammonia gas in the air outlet pipe 1041 can flow through the pressure relief port 1042 to the first-stage air inlet pipe 102, thereby reducing the outlet pressure of the compressor 101 and increasing the first-stage air inlet flow of the compressor 101, thus effectively and quickly alleviating the surge phenomenon of the compressor 101.

[0067] The above embodiment achieves real-time monitoring of the state of the second-stage compressed ammonia by setting a pressure relief port 1042 on the outlet pipe 1041 to connect to the return pipe 1051, and arranging an outlet gas data monitoring component 1043 between the compressor 101 and the pressure relief port 1042. Positioning the pressure relief port 1042 downstream of the outlet gas data monitoring component 1043 avoids interference with the second-stage compressed ammonia gas data caused by compressor 101 surging or the activation of the anti-surge circuit. When compressor 101 experiences surging, the controller can quickly open the anti-surge valve 1052, allowing some of the second-stage compressed ammonia to flow back to the first-stage inlet gas path 102 via the pressure relief port 1042. This effectively reduces the outlet pressure of compressor 101 and increases the inlet flow rate, thereby quickly and effectively alleviating the surging phenomenon of compressor 101 and improving the response speed and control accuracy of the ammonia refrigeration compressor unit 10.

[0068] In some embodiments, the exhaust gas data monitoring assembly 1043 includes a third temperature monitoring element 1044. The third temperature monitoring element 1044 is disposed in the exhaust pipe 1041.

[0069] The exhaust gas data monitoring component 1043 includes a third pressure monitoring element 1045. The third pressure monitoring element 1045 is disposed in the exhaust pipe 1041 and is closer to the compressor 101 than the third temperature monitoring element 1044.

[0070] The exhaust gas data monitoring component 1043 includes a second flow monitoring element 1046. The second flow monitoring element 1046 is disposed in the exhaust pipe 1041 and is located between the third temperature monitoring element 1044 and the third pressure monitoring element 1045.

[0071] The third pressure monitoring element 1045, the second flow monitoring element 1046, and the third temperature monitoring element 1044 are respectively connected to the controller of the ammonia refrigeration station compressor 101 group. The controller can determine the flow rate of the gas being added in the gas adding line 103 based on the second flow data obtained by the second flow monitoring element 1046 and the first flow data obtained by the first flow monitoring element 1026. The controller can also determine the operating status of the compressor 101 based on the third pressure data and the third temperature data obtained by the third pressure monitoring element 1045. When the third pressure data is too high, the anti-surge valve 1052 is opened in time to prevent the compressor 101 from surging.

[0072] In the above embodiments, by installing a third temperature monitoring element 1044, a third pressure monitoring element 1045, and a second flow monitoring element 1046 on the outlet pipe 1041, continuous and stable monitoring of the pressure, temperature, and flow data of the second-stage compressed ammonia gas is achieved. The controller can acquire the third pressure data, third temperature data, and second flow data of the second-stage compressed ammonia gas, and can calculate the flow data of the ammonia gas based on the second flow data and the first flow data of the first-stage intake gas. The controller can also promptly open the anti-surge valve 1052 based on the third pressure data to prevent surge in the compressor 101, thereby improving the control level and operational safety of the ammonia refrigeration compressor unit 10.

[0073] This application also provides an ammonia refrigeration system, which includes an ammonia gas supply component, a liquid ammonia supply component, and an ammonia refrigeration compressor unit 10 provided in any of the above embodiments. The liquid ammonia supply component can supply liquid ammonia to the ammonia refrigeration compressor unit 10, and the ammonia gas supply component can supply low-temperature, low-pressure ammonia to the ammonia refrigeration compressor unit 10.

[0074] The ammonia refrigeration system provided in this application has the ammonia refrigeration compressor unit 10 as described in any of the above embodiments, and therefore has the beneficial effects of any of the above embodiments of the ammonia refrigeration compressor unit 10, which will not be described in detail here.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An ammonia refrigeration compressor unit, characterized in that, The ammonia refrigeration system is configured to include an ammonia gas supply component and a liquid ammonia supply component. The ammonia gas supply component is capable of outputting low-temperature, low-pressure ammonia gas. The ammonia refrigeration compressor unit includes: compressor; An intake air passage is connected to the ammonia supply component and the compressor, and the low-temperature, low-pressure ammonia can enter the compressor through the intake air passage to form a compressed ammonia. A gas filling path is connected to the ammonia supply component and the compressor. The low-temperature, low-pressure ammonia can enter the compressor through the gas filling path and mix with the first-stage compressed ammonia to obtain second-stage compressed ammonia. The outlet gas path is connected to the compressor, and the second-stage compressed ammonia gas can be discharged from the ammonia refrigeration compressor unit through the outlet gas path. An anti-surge air passage is provided between the first-stage inlet air passage and the first-stage outlet air passage. When the compressor experiences surge, the anti-surge air passage can send the second-stage compressed ammonia gas into the first-stage inlet air passage. A cooling pipeline is installed between the liquid ammonia supply component and the anti-surge gas path. The cooling pipeline is used to introduce liquid ammonia from the liquid ammonia supply component into the anti-surge gas path to cool the second-stage compressed ammonia gas in the anti-surge gas path.

2. The ammonia refrigeration compressor unit according to claim 1, characterized in that, The anti-surge airflow path includes: A return gas pipe, wherein the inlet of the return gas pipe is connected to the outlet gas path, and the outlet of the return gas pipe is connected to the section of the inlet gas path. An anti-surge valve is installed in the return gas pipeline. When the compressor experiences surge, the anti-surge valve opens to allow the second-stage compressed ammonia gas in the outlet gas path to flow back to the first-stage inlet gas path.

3. The ammonia refrigeration compressor unit according to claim 2, characterized in that, The cooling pipeline includes: The cooling pipe has a first port connected to the liquid ammonia supply component and a second port connected to the return gas pipe. The second port of the cooling pipe is located between the first section of the air intake passage and the anti-surge valve. A temperature control valve is installed in the cooling pipe. The temperature control valve can open when the temperature in the anti-surge air circuit reaches a predetermined temperature.

4. The ammonia refrigeration compressor unit according to claim 3, characterized in that, The compressor includes: The first air inlet is connected to the first air inlet passage. The low-temperature, low-pressure ammonia gas enters the compressor through the first air inlet and completes a first compression, thereby forming a first compressed ammonia gas. The second air inlet is connected to the gas supply line. The low-temperature, low-pressure ammonia gas enters the compressor through the second air inlet and mixes with the first-stage compressed ammonia gas in the compressor to form a mixed gas. Then the compressor compresses the mixed gas to obtain second-stage compressed ammonia gas. The outlet is connected to the outlet gas path, and the second-stage compressed ammonia gas flows out of the compressor through the outlet.

5. The ammonia refrigeration compressor unit according to claim 4, characterized in that, The intake air passage includes: An intake pipe is connected to the ammonia supply assembly and the first intake port; A return air port is provided in the section of the air inlet pipe, and the return air port is connected to the air outlet of the return air pipe; A gas data monitoring component is installed in the gas inlet pipe, and the gas data monitoring component is located between the gas return port and the compressor.

6. The ammonia refrigeration compressor unit according to claim 5, characterized in that, The gas data monitoring component includes: A first temperature monitoring element is installed in the aforementioned section of the air intake pipe; A first pressure monitoring element is disposed in the intake pipe section, and the first pressure monitoring element is farther away from the compressor than the first temperature monitoring element; A first flow monitoring element is disposed in the section of the air intake pipe, and the first flow monitoring element is located between the first temperature monitoring element and the first pressure monitoring element.

7. The ammonia refrigeration compressor unit according to claim 4, characterized in that, The gas refueling circuit includes: A gas supply pipeline is connected to the ammonia supply assembly and the second gas inlet; A gas refueling data monitoring component is installed in the gas refueling pipeline, and the gas refueling data monitoring component includes: A second temperature monitoring element is installed in the gas filling pipeline; A second pressure monitoring element is disposed in the gas filling pipeline, and the second pressure monitoring element is farther away from the compressor than the second temperature monitoring element.

8. The ammonia refrigeration compressor unit according to claim 4, characterized in that, The outlet air path includes: An air outlet pipe is connected to the air outlet; A pressure relief port is provided in the outlet pipe, and the pressure relief port is connected to the inlet of the return pipe; An exhaust gas data monitoring component is installed in the exhaust pipe, and the exhaust gas data monitoring component is located between the compressor and the pressure relief port.

9. The ammonia refrigeration compressor unit according to claim 8, characterized in that, The exhaust gas data monitoring component includes: A third temperature monitoring element is installed in the air outlet pipe; A third pressure monitoring element is disposed in the outlet pipe, and the third pressure monitoring element is closer to the compressor than the third temperature monitoring element; A second flow monitoring element is disposed in the outlet pipe, and the second flow monitoring element is located between the third temperature monitoring element and the third pressure monitoring element.

10. An ammonia refrigeration system, characterized in that, include: Ammonia supply components; Liquid ammonia supply components; As described in any one of claims 1 to 9, the liquid ammonia supply component is capable of providing liquid ammonia to the ammonia refrigeration compressor unit, and the ammonia gas supply component is capable of providing low-temperature, low-pressure ammonia gas to the ammonia refrigeration compressor unit.

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