A chiller, chiller unit and flue gas cooling system

Abstract

The application provides a refrigerating machine, a refrigerating unit and a flue gas cooling system, and the refrigerating machine comprises a compressor, a separation assembly, a condenser, an evaporator and an economizer, the separation assembly comprises a first oil separator and a second oil separator connected in series, the air inlet of the first oil separator is connected with the air outlet of the compressor, the oil return outlet of the second oil separator is connected with the air inlet of the compressor, the condenser is connected with the separation assembly and located downstream of the separation assembly, the evaporator is connected with the compressor, the economizer comprises a first chamber and a second chamber, the inlet of the first chamber is connected with the refrigerant outlet of the condenser, the outlet of the first chamber is connected with the refrigerant inlet of the evaporator, the inlet of the second chamber is connected with the outlet of the first chamber, and the outlet of the second chamber is connected with the refrigerant inlet of the compressor. The refrigerating machine provided by the application can not only effectively reduce the oil running phenomenon, improve the operation efficiency and reliability, but also ensure the stability and adaptability of the system under variable working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigerators, in particular, to a refrigerator, a refrigerator unit and a flue gas cooling system. BACKGROUND

[0002] During the operation of a refrigerator, there is a phenomenon of "oil runout", which refers to the lubricating oil in the compressor being discharged together with the refrigerant gas and failing to return to the compressor through the normal oil return mechanism, resulting in insufficient oil supply to the compressor and affecting the lubrication and cooling effect of the compressor. Insufficient oil supply will exacerbate the wear of the compressor components and shorten their service life. When the oil runout is severe, the oil level in the oil separator will drop rapidly, and when the oil level is below a certain value, an oil level alarm device will be triggered, causing the refrigerator to shut down. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art.

[0004] To this end, an embodiment of the present application proposes a refrigerator that not only effectively reduces the oil runout phenomenon, improves the operating efficiency and reliability, but also ensures the stability and adaptability of the system under varying operating conditions.

[0005] The refrigerator according to an embodiment of the present application comprises:

[0006] a compressor;

[0007] a separation assembly comprising a first oil separator and a second oil separator connected in series, the gas inlet of the first oil separator being connected to the gas outlet of the compressor, and the oil return outlet of the second oil separator being connected to the gas inlet of the compressor;

[0008] a condenser connected to the separation assembly and located downstream of the separation assembly;

[0009] an evaporator connected to the compressor;

[0010] an economizer comprising a first chamber and a second chamber, the inlet of the first chamber being connected to the refrigerant outlet of the condenser, the outlet of the first chamber being connected to the refrigerant inlet of the evaporator, the inlet of the second chamber being connected to the outlet of the first chamber, and the outlet of the second chamber being connected to the refrigerant inlet of the compressor.

[0011] The refrigerating machine of the embodiment of the present application adds an external second oil separator on the basis of the first oil separator, ensures that the lubricating oil can return to the compressor, and avoids oil level drop and oil level alarm. In addition, by reducing oil leakage, the lubrication and cooling effect of the compressor is ensured, thereby improving the operation efficiency and service life of the compressor.

[0012] In some embodiments, the second oil separator comprises a separation cavity, and a plurality of oil separation filter cartridges are arranged in the separation cavity, and the plurality of oil separation filter cartridges are arranged in a circumferential direction of a center line of the second oil separator.

[0013] In some embodiments, the separation cavity is two, and the two separation cavities are oppositely arranged on both sides of the gas inlet cavity of the second oil separator in the extension direction of the second oil separator.

[0014] In some embodiments, the refrigerating machine of the embodiment of the present application further comprises an oil baffle connected with the second oil separator and located in the separation cavity, and the oil baffle is located between two adjacent oil separation filter cartridges in a direction orthogonal to the extension direction of the second oil separator.

[0015] In some embodiments, in the direction from the gas inlet cavity of the second oil separator to the separation cavity, one end of the oil baffle adjacent to the gas inlet cavity of the second oil separator is lower than the other end of the oil baffle away from the gas inlet cavity of the second oil separator.

[0016] In some embodiments, the refrigerating machine of the embodiment of the present application further comprises a gas baffle connected with the second oil separator and located in the separation cavity, and the gas baffle is arranged adjacent to the gas outlet of the second oil separator.

[0017] In some embodiments, the evaporator has an oil return port, and the distance from the oil return port to the bottom of the evaporator is less than the distance from the oil return port to the top of the evaporator.

[0018] In some embodiments, the evaporator has a plurality of oil return ports, and the plurality of oil return ports are arranged in the extension direction of the evaporator, and the distance between the plurality of oil return ports to the bottom of the evaporator decreases in the extension direction of the evaporator.

[0019] The refrigerating machine group of the embodiment of the present application comprises a plurality of refrigerating machines, and each refrigerating machine is the refrigerating machine according to any one of the above embodiments. The bottom of the first oil separator of one refrigerating machine and the bottom of the first oil separator of another refrigerating machine are connected by a pipeline between two adjacent refrigerating machines, and a control valve is arranged on the pipeline.

[0020] The flue gas cooling system of the embodiment of the present application comprises:

[0021] The spray cooling tower has a smoke inlet and a smoke outlet, and has a plurality of spray zones arranged in sequence along the smoke flow direction;

[0022] A plurality of spray assemblies correspond to the plurality of spray zones one by one, and the spray assemblies are used to spray a spray solution into the spray zones to cool the smoke flowing through the plurality of spray zones to room temperature or below;

[0023] The refrigeration assembly includes a plurality of refrigeration units, and the refrigeration units are the refrigeration units according to the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of a refrigeration machine of an embodiment of the present application.

[0025] Figure 2 is a first-view internal structure schematic diagram of a second oil separator of a refrigeration machine of an embodiment of the present application.

[0026] Figure 3 is a first-view internal structure schematic diagram of a second oil separator of a refrigeration machine of an embodiment of the present application.

[0027] Figure 4 is a structural schematic diagram of an evaporator of a refrigeration machine of an embodiment of the present application.

[0028] REFERENCE NUMERALS:

[0029] 1, compressor,

[0030] 2, separation assembly, 21, first oil separator, 22, second oil separator, 23, oil filter element, 24, oil baffle, 25, air baffle, 26, air inlet cavity,

[0031] 3, condenser,

[0032] 4, evaporator, 41, oil return port,

[0033] 5, economizer, 51, first chamber, 52, second chamber,

[0034] 6, drying filter,

[0035] 7, electronic expansion valve,

[0036] 8, solenoid valve,

[0037] 9, thermal expansion valve. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein like reference numerals refer to like elements throughout. The embodiments described below are exemplary in nature, and are intended to be illustrative of the present application rather than to limit the same.

[0039] A chiller according to an embodiment of the present application is described below with reference to the attached drawing figures.

[0040] As shown in Figures 1-4 , a chiller according to an embodiment of the present application includes a compressor 1, a separation assembly 2, a condenser 3, an evaporator 4, and an economizer 5.

[0041] The separation assembly 2 includes a first oil separator 21 and a second oil separator 22 connected in series. The first oil separator 21 is connected to the discharge port of the compressor 1 to receive the compressed refrigerant gas. The second oil separator 22 is connected to the suction port of the compressor 1 to return the separated lubricating oil to the compressor 1.

[0042] Specifically, as shown in Figure 1 , the compressor 1 is the core of the refrigeration cycle, which compresses and raises the temperature and pressure of the refrigerant gas. The discharge port of the compressor 1 is connected to the intake port of the first oil separator 21 in the separation assembly 2, so as to send the compressed refrigerant gas to the separation assembly 2 for oil separation.

[0043] The separation assembly 2 includes the first oil separator 21 and the second oil separator 22, which work in series to separate the lubricating oil in the refrigerant gas. The intake port of the first oil separator 21 is connected to the discharge port of the compressor 1 to receive the compressed refrigerant gas. After the first oil separator 21 separates the lubricating oil, the refrigerant gas flows into the second oil separator 22. The return oil outlet of the second oil separator 22 is connected to the suction port of the compressor 1 to ensure that the separated lubricating oil can return to the compressor 1, thereby reducing the oil run-off phenomenon.

[0044] The condenser 3 is located downstream of and connected to the separation assembly 2. The condenser 3 receives the refrigerant gas from the separation assembly 2 and condenses it into a liquid state while releasing heat.

[0045] The evaporator 4 is connected to the compressor 1. The refrigerant in the evaporator 4 absorbs heat and evaporates, and the evaporated refrigerant is introduced into the compressor 1, thereby reducing the temperature of the surrounding environment and achieving the refrigeration effect. The economizer 5 includes a first chamber 51 and a second chamber 52. The inlet of the first chamber 51 is connected to the refrigerant outlet of the condenser 3 to receive the condensed refrigerant. The outlet of the first chamber 51 is connected to the refrigerant inlet of the evaporator 4 to send the refrigerant into the evaporator 4. The inlet of the second chamber 52 is connected to the outlet of the first chamber 51 to re-introduce the refrigerant gas discharged from the economizer 5 into the second chamber 52 and preheat the refrigerant in the first chamber 51 of the economizer 5. The outlet of the second chamber 52 is connected to the refrigerant inlet of the compressor 1 to send the refrigerant gas back to the compressor 1. That is, the economizer 5 can increase the heat absorption of the refrigerant in the evaporator 4, thereby increasing the refrigeration capacity of the refrigeration system.

[0046] It should be noted that, as shown in Figure 1 The condenser 3 and the economizer 5 can be connected by a pipe, and a drying filter 6 is arranged on the pipe to dry the refrigerant discharged from the condenser 3. The economizer 5 and the evaporator 4 can be connected by a pipe, and an electronic expansion valve 7 is arranged on the pipe to accurately control the flow of refrigerant according to the change of the load of the evaporator 4, so as to ensure that the flow of refrigerant in the evaporator 4 matches the heat load, thereby improving the refrigeration efficiency. The inlet of the second chamber 52 and the outlet of the first chamber 51 can be connected by a pipe, and an electromagnetic valve 8 and a thermal expansion valve 9 are arranged in sequence along the direction of refrigerant flow. The combination of the electromagnetic valve 8 and the thermal expansion valve 9 can realize sequential control, that is, under certain conditions, the electromagnetic valve 8 controls the flow first, and then the thermal expansion valve 9 adjusts the flow. Through the cooperation of the electromagnetic valve 8 and the thermal expansion valve 9, the flow and pressure of the refrigerant can be more accurately controlled to adapt to different working conditions and load requirements.

[0047] Therefore, the refrigeration machine of the embodiment of the present application increases the external second oil separator 22 on the basis of the first oil separator 21, ensures that the lubricating oil can return to the compressor 1, and avoids the oil level drop and oil level alarm. In addition, by reducing oil leakage, the lubrication and cooling effect of the compressor 1 is guaranteed, thereby improving the operation efficiency and service life of the compressor 1.

[0048] In some embodiments, the second oil separator 22 includes a separation chamber, and a plurality of oil separation filter cartridges 23 are arranged in the separation chamber and are arranged in a circumferential direction along a center line of the second oil separator 22.

[0049] It can be understood that, as shown in Figures 1-3As shown, the arrangement of multiple oil separation cartridges 23 in the separation cavity can increase the contact area between the oil and the refrigerant, thereby improving the separation efficiency and ensuring that the lubricating oil can be more effectively separated from the refrigerant. That is, the oil separation cartridges 23 are arranged in a circumferential direction along the center line of the second oil separator 22, which helps to achieve uniform distribution of the refrigerant in the separation cavity, thereby achieving a more uniform separation effect. In addition, the design of multiple oil separation cartridges 23 helps to reduce the load of a single cartridge, avoid blockage of the cartridge due to oil dirt or impurities accumulation, and reduce the pressure drop during system operation.

[0050] Optionally, as shown, the oil separation cartridges 23 are three, and the three oil separation cartridges 23 are uniformly arranged in a circumferential direction along the center line of the second oil separator 22, and one of the three oil separation cartridges 23 is arranged adjacent to the top of the second oil separator 22. Figures 1-3

[0051] Preferably, the separation cavity is two, and the two separation cavities are oppositely arranged on both sides of the gas inlet cavity 26 of the second oil separator 22 in the extension direction of the second oil separator 22. That is, the design of two separation cavities can increase the separation area, thereby improving the separation efficiency of the lubricating oil. When the refrigerant gas passes through the separation cavity, the contact area between the lubricating oil and the refrigerant increases, which helps to better separate the oil mist. The oppositely arranged two separation cavities help to achieve uniform distribution of the refrigerant gas inside the separator, reduce the dead zone of the gas flow and local vortex, and improve the separation effect.

[0052] In some embodiments, the refrigerator of the embodiment of the present application further comprises an oil baffle 24 connected to the second oil separator 22 and located in the separation cavity, and in a direction orthogonal to the extension direction of the second oil separator 22, the oil baffle 24 is located between the adjacent two oil separation cartridges 23.

[0053] Specifically, as shown, the oil baffle 24 comprises a first baffle and a second baffle connected together, and the longitudinal section of the first baffle and the second baffle is conical, so that the oil droplets separated by the upper oil separation cartridge 23 can flow out to the bottom of the second oil separator 22 along the oil baffle 24. Figures 1-3

[0054] That is, the oil baffle 24 functions to block and guide the oil mist in the refrigerant gas, so that it is more easily captured by the oil separation cartridge 23, thereby enhancing the oil separation efficiency.

[0055] Preferably, as shown, in the direction from the gas inlet cavity 26 of the second oil separator 22 to the separation cavity, the end of the oil baffle 24 adjacent to the gas inlet cavity 26 of the second oil separator 22 is lower than the end of the oil baffle 24 away from the gas inlet cavity 26 of the second oil separator 22. Figures 1-3

[0056] ​​​In some embodiments, the chiller of the present embodiments further comprises a baffle 25, which is connected to the second oil separator 22 and located in the separation cavity, and the baffle 25 is arranged adjacent to the exhaust port of the second oil separator 22.

[0057] As can be understood from FIGS. 1 and 2, the oil separation filter 23 is arranged close to the exhaust port of the second oil separator 22. Figures 1-3 As can be understood from FIGS. 1 and 2, the oil separation filter 23 is arranged close to the exhaust port of the second oil separator 22.

[0058] In some embodiments, the evaporator 4 has an oil return port 41, and the distance from the oil return port 41 to the bottom of the evaporator 4 is less than the distance from the oil return port 41 to the top of the evaporator 4.

[0059] As can be understood from FIGS. 1 and 2, the oil separation filter 23 is arranged close to the exhaust port of the second oil separator 22. Figure 1 Figure 4 As can be understood from FIGS. 1 and 2, the oil separation filter 23 is arranged close to the exhaust port of the second oil separator 22.

[0060] Preferably, the oil return port 41 is a plurality of oil return ports 41, which are arranged at intervals along the extension direction of the evaporator 4, and the distance from the plurality of oil return ports 41 to the bottom of the evaporator 4 decreases in the extension direction of the evaporator 4. That is, the interval arrangement of the plurality of oil return ports 41 helps to achieve more uniform oil return, ensuring that the lubricating oil in the entire evaporator 4 can be effectively recovered. The design of the plurality of oil return ports 41 can adapt to different operating conditions, ensuring that the oil can be effectively managed under variable working conditions.

[0061] The chiller unit of the present embodiments is described below.

[0062] The chiller unit of the present embodiments comprises a refrigerant group comprising a plurality of chillers, and each chiller is a chiller according to any one of the above embodiments. The bottom of the first oil separator 21 of one chiller is connected to the bottom of the first oil separator 21 of another chiller through a pipeline, and a control valve is arranged on the pipeline.

[0063] As can be understood, when two chillers are operated in parallel, the amount of oil return is not balanced. Then, the oil level of the two oil separators is balanced by using the blowdown pipeline below the oil separators of the two chillers. And a control valve is arranged on the connected blowdown pipeline, so as to realize the function of controlling the uniform distribution of the oil level by adjusting the control valve.​

[0064] The flue gas cooling system of the embodiment of the present application is described below.

[0065] The flue gas cooling system of the embodiment of the present application comprises a spray cooling tower, a refrigeration assembly and a plurality of spray assemblies.

[0066] The spray cooling tower has a flue gas inlet and a flue gas outlet, and a plurality of spray zones are arranged in the spray cooling tower in sequence along the direction of flue gas flow. The plurality of spray assemblies correspond to the plurality of spray zones one-to-one, and the spray assemblies are used to spray a spray solution into the spray zones to cool the flue gas flowing through the plurality of spray zones in sequence to room temperature or below. The refrigeration assembly comprises a plurality of refrigeration units, and the refrigeration assembly is connected to at least one of the plurality of spray assemblies.

[0067] It can be understood that the spray cooling tower is the core component of the system for cooling the flue gas. The spray cooling tower has a flue gas inlet and a flue gas outlet for guiding the flue gas in and out. A plurality of spray zones are arranged in the spray cooling tower in sequence along the direction of flue gas flow for gradually cooling the flue gas.

[0068] The refrigeration assembly comprises a plurality of refrigeration units, and the function of the refrigeration assembly is to provide cooling capacity for the spray system to ensure that the spray solution can effectively cool the flue gas in the spray zones.

[0069] The plurality of spray assemblies correspond to the plurality of spray zones in the spray cooling tower one-to-one. The spray assemblies are used to spray a spray solution into the spray zones, and the solution can be water or other cooling medium. The spraying of the spray solution helps to cool the flue gas to room temperature or below.

[0070] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0071] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0072] In the present application, unless specifically defined otherwise, the terms "mount", "connected", "connecting", "fixed", "unfixed", and the like are to be construed in their broadest possible sense, such as, for example, fixedly connected, detachably connected, or integral; mechanically connected, electrically connected, or communicatively connected; directly connected, or indirectly connected via intervening medium; or internal communication between elements, or interaction between elements, unless specifically defined otherwise. The specific meaning of the above terms in the present application can be understood according to the specific circumstances by those of ordinary skill in the art.

[0073] In the present application, unless specifically defined otherwise, a first feature "on", "above", or "over" a second feature can be direct contact between the first and second features, or indirect contact between the first and second features via intervening medium. Furthermore, the first feature "above", "over", and "on top of" the second feature can be directly above or obliquely above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature. The first feature "below", "under", and "underneath" the second feature can be directly below or obliquely below the second feature, or simply indicate that the first feature is at a lower horizontal level than the second feature.

[0074] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present application. Descriptive terms of the above terms in the present specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those of ordinary skill in the art without contradiction.

[0075] Although embodiments of the present application have been shown and described above, it is to be understood that the above-described embodiments are merely exemplary, and are not to be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, replacements, and variations to the above-described embodiments within the scope of the present application.

Claims

1. A refrigerator characterized by comprising: Comprise: a compressor; a separation assembly comprising a first oil separator and a second oil separator connected in series, an air inlet of the first oil separator being connected to an air outlet of the compressor, an oil outlet of the second oil separator being connected to an air inlet of the compressor; a condenser connected to the separation assembly and downstream of the separation assembly; an evaporator connected to the compressor; an economizer comprising a first chamber and a second chamber, an inlet of the first chamber being connected to a refrigerant outlet of the condenser, an outlet of the first chamber being connected to a refrigerant inlet of the evaporator, an inlet of the second chamber being connected to the outlet of the first chamber, an outlet of the second chamber being connected to a refrigerant inlet of the compressor.

2. The refrigerator of claim 1, wherein The second oil separator comprises a separation chamber, a plurality of oil separation cartridges are arranged in the separation chamber, and the plurality of oil separation cartridges are arranged in a circumferential direction along a center line of the second oil separator.

3. A refrigerator as claimed in claim 2, characterised in that The separation chamber is two, and the two separation chambers are oppositely arranged on both sides of the air inlet chamber of the second oil separator along the extension direction of the second oil separator.

4. The refrigerator of claim 3, wherein Further comprising an oil baffle connected to the second oil separator and located in the separation chamber, the oil baffle is located between two adjacent oil separation cartridges in a direction perpendicular to the extension direction of the second oil separator.

5. The refrigerator of claim 4, wherein, In the direction from the air inlet chamber of the second oil separator to the separation chamber, the oil baffle is lower at one end adjacent to the air inlet chamber of the second oil separator than at the other end away from the air inlet chamber of the second oil separator.

6. The refrigerator of claim 5, wherein, Further comprising a gas baffle connected to the second oil separator and located in the separation chamber, the gas baffle is arranged adjacent to the air outlet of the second oil separator.

7. A chiller according to any one of claims 1-6, characterized in that, The evaporator has an oil return port, the distance from the oil return port to the bottom of the evaporator is less than the distance from the oil return port to the top of the evaporator.

8. The refrigerator of claim 7, wherein The oil return port is a plurality of, a plurality of oil return ports are arranged in the extension direction of the evaporator, and the distance between a plurality of oil return ports to the bottom of the evaporator decreases in the extension direction of the evaporator.

9. A refrigeration unit characterized by, Comprise: The refrigerant group comprises a plurality of refrigerators, the refrigerator is according to any one of claims 1-8, between two adjacent refrigerators, the bottom of the first oil separator of one refrigerator is connected to the bottom of the first oil separator of another refrigerator through a pipeline, and a control valve is arranged on the pipeline.

10. A flue gas cooling system characterized by, Comprise: A spray cooling tower has a smoke inlet and a smoke outlet, and a plurality of spray zones are arranged in the spray cooling tower in sequence along the flow direction of flue gas; A plurality of spray assemblies are one-to-one corresponding to a plurality of spray zones, the spray assembly is used to spray spray solution into the spray zone, so as to cool the flue gas flowing through a plurality of spray zones in sequence to room temperature or below room temperature; A refrigeration assembly comprises a plurality of refrigeration units, the refrigeration unit is according to claim 9, and the refrigeration assembly is connected with at least one of a plurality of spray assemblies.

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