Mixed refrigerant, composition, refrigerating system and refrigerating equipment

Abstract

The invention relates to a mixed refrigerant, a composition, a refrigerating system and refrigerating equipment, and belongs to the technical field of refrigerants, the mixed refrigerant comprises a first component, a second component and a third component; wherein the first component comprises 3, 3, 3-trifluoropropyne, the second component comprises trans-1, 2-difluoroethylene, and the third component comprises at least one of dimethyl ether and trans-1, 3, 3, 3-tetrafluoropropene. According to the mixed refrigerant, the GWP is smaller than 10, the ODP value (ozone consumption potential value) is 0, the obvious environmental protection advantage is achieved, meanwhile, the performance coefficient of the mixed refrigerant is close to that of R134a, the refrigerating capacity per unit volume is equal to or even better than that of R134a, the temperature slip is smaller than 5 DEG C, and R134a can be well and directly replaced.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigerants, and in particular relates to a mixed refrigerant, a composition, a refrigeration system and a refrigeration device. Background Art

[0002] Hydrofluorocarbon (HFCs) compounds are potent greenhouse gases with a global warming potential (GWP) thousands of times that of carbon dioxide, and their emissions account for about 2%-3% of the world's total greenhouse gas emissions. By using refrigerants with lower GWP, the carbon footprint of the refrigeration system throughout its life cycle can be greatly reduced, slowing the pace of global warming. Several international environmental agreements have restricted the use of refrigerants, including the Montreal Protocol and the Kigali Amendment, requiring the gradual elimination or reduction of high GWP refrigerants. With the improvement of environmental awareness, the industry standards for refrigerants are also constantly being updated, encouraging the use of refrigerants with low GWP values ​​to reduce the impact on the environment.

[0003] R134a is widely used in a variety of refrigeration and air-conditioning systems, especially as a refrigerant for automotive air conditioners. However, its GWP is as high as 1300 and it is included in the control catalog. Its reduction and elimination is an inevitable trend. From the perspective of environmental protection regulations, the promotion and application of R134a refrigerant substitutes are of great significance in reducing greenhouse gas emissions, promoting industrial technological progress, meeting market demand, and enhancing the national image. It is urgent to identify a sustainable substitute to gradually phase out R134a. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present invention proposes a mixed refrigerant, a composition, a refrigeration system and a refrigeration equipment to solve the technical problems that the R134a refrigerant has a high GWP and a large amount of greenhouse gas emissions, which have an adverse impact on the environment.

[0005] According to the first aspect of an embodiment of the present application, a mixed refrigerant is provided, which includes a first component, a second component and a third component; wherein the first component includes 3,3,3-trifluoropropyne, the second component includes trans-1,2-difluoroethylene, and the third component includes at least one of dimethyl ether and trans-1,3,3,3-tetrafluoropropylene.

[0006] In combination with the first aspect, in an optional implementation of an embodiment of the present application, the mixed refrigerant consists of a first component, a second component and a third component, the first component is 3,3,3-trifluoropropyne, the second component is trans-1,2-difluoroethylene, and the third component is dimethyl ether.

[0007] In combination with the first aspect, in an optional implementation of an embodiment of the present application, the first component is 1%-56% of 3,3,3-trifluoropropyne, the second component is 1%-28% of trans-1,2-difluoroethylene, and the third component is 40%-92% of dimethyl ether, calculated by mass percentage.

[0008] In combination with the first aspect, in an optional implementation of an embodiment of the present application, the mixed refrigerant consists of a first component, a second component and a third component, the first component is 3,3,3-trifluoropropyne, the second component is trans-1,2-difluoroethylene, and the third component is trans-1,3,3,3-tetrafluoropropylene.

[0009] In combination with the first aspect, in an optional implementation of an embodiment of the present application, the first component is 4%-88% of 3,3,3-trifluoropropyne, the second component is 4%-92% of trans-1,2-difluoroethylene, and the third component is 1%-10% of trans-1,3,3,3-tetrafluoropropylene, calculated by mass percentage.

[0010] In combination with the first aspect, in an optional implementation of an embodiment of the present application, the mixed refrigerant consists of a first component, a second component and a third component, the first component is 3,3,3-trifluoropropyne, the second component is trans-1,2-difluoroethylene, and the third component is dimethyl ether and trans-1,3,3,3-tetrafluoropropylene.

[0011] In combination with the first aspect, in an optional implementation of an embodiment of the present application, the first component is 4%-32% of 3,3,3-trifluoropropyne, the second component is 8%-16% of trans-1,2-difluoroethylene, and the third component is 48%-72% of dimethyl ether and 8%-28% of trans-1,3,3,3-tetrafluoropropylene, calculated by mass percentage.

[0012] According to a second aspect of an embodiment of the present application, a composition is provided, comprising a lubricant and the mixed refrigerant provided in the first aspect of an embodiment of the present application.

[0013] According to a third aspect of the embodiments of the present application, a refrigeration system is provided. The refrigeration system uses the mixed refrigerant provided in the first aspect of the embodiments of the present application, or uses the composition provided in the second aspect of the embodiments of the present application.

[0014] According to a fourth aspect of an embodiment of the present application, a refrigeration device is provided, wherein the refrigeration device adopts the refrigeration system provided by the third aspect of the embodiment of the present application.

[0015] The technical solution of this embodiment may have the following beneficial effects:

[0016] Regarding the GWP value of the mixed refrigerant in the embodiment of the present application: since the GWP of 3,3,3-trifluoropropyne (TFP) is 11, the GWP of trans-1,2-difluoroethylene (R1132(E)) is 1, and the GWPs of trans-1,3,3,3-tetrafluoropropylene (R1234ze(E)) and dimethyl ether (RE170) are both 1, the mixed refrigerant in this embodiment has excellent environmental performance, GWP <10, which can significantly improve the environmental performance of the refrigerant.

[0017] Regarding the thermodynamic properties of the mixed refrigerant: the main indicators of thermodynamic properties are COP and relative volumetric refrigeration capacity. Compared with R134a, 3,3,3-trifluoropropyne (TFP) has a larger relative volumetric refrigeration capacity and a lower COP than R134a. The relative volumetric refrigeration capacity and relative COP of trans-1,2-difluoroethylene (R1132(E)) are both higher than R134a. The relative COP of trans-1,3,3,3-tetrafluoropropylene (R1234ze(E)) is equivalent to that of R134a, and the relative volumetric refrigeration capacity is lower than that of R134a. The relative volumetric refrigeration capacity of dimethyl ether (RE170) is lower, and the relative COP is higher. Therefore, the mixed refrigerant of this embodiment can make the thermodynamic properties of the mixture equivalent to or higher than that of R134a at an appropriate ratio. DETAILED DESCRIPTION

[0018] The present invention is further illustrated below through the description of specific implementation modes, but this is not a limitation of the present invention. Those skilled in the art can make various modifications or improvements based on the basic idea of ​​the present invention, but as long as they do not deviate from the basic idea of ​​the present invention, they are all within the scope of the present invention.

[0019] In the related technology, since the refrigerant R134a, which is still widely used, has a GWP value of up to 1300 and does not meet environmental protection requirements, it is necessary to seek an environmentally friendly refrigerant with low GWP and thermodynamic properties comparable to or even better than R134a, which can better replace R134a.

[0020] In order to solve the above technical problems, the present embodiment proposes a mixed refrigerant, which includes a first component, a second component and a third component; wherein the first component includes 3,3,3-trifluoropropyne, the second component includes trans-1,2-difluoroethylene, and the third component includes at least one of dimethyl ether and trans-1,3,3,3-tetrafluoropropylene.

[0021] The mixed refrigerant proposed in this embodiment has a GWP of less than 10 and an ODP (ozone depletion potential) of 0, which has obvious environmental advantages. At the same time, the performance coefficient of the mixed refrigerant is similar to that of R134a, the unit volume cooling capacity is equivalent to or even better than that of R134a, and the temperature glide is less than 5°C, which can directly replace R134a.

[0022] The present embodiment is described in detail below. The following implementation modes and examples may be combined with each other unless there is any conflict.

[0023] This embodiment proposes a mixed refrigerant, which includes a first component, a second component and a third component; wherein the first component includes 3,3,3-trifluoropropyne, the second component includes trans-1,2-difluoroethylene, and the third component includes at least one of dimethyl ether and trans-1,3,3,3-tetrafluoropropylene.

[0024] In an optional implementation, the mixed refrigerant consists of a first component, a second component and a third component, the first component is 3,3,3-trifluoropropyne, the second component is trans-1,2-difluoroethylene, and the third component is dimethyl ether.

[0025] In an optional implementation, based on mass percentage, the first component is 1%-56% of 3,3,3-trifluoropropyne, the second component is 1%-28% of trans-1,2-difluoroethylene, and the third component is 40%-92% of dimethyl ether.

[0026] In an optional implementation, the mixed refrigerant consists of a first component, a second component and a third component, the first component is 3,3,3-trifluoropropyne, the second component is trans-1,2-difluoroethylene, and the third component is trans-1,3,3,3-tetrafluoropropylene.

[0027] In an optional implementation, based on mass percentage, the first component is 4%-88% of 3,3,3-trifluoropropyne, the second component is 4%-92% of trans-1,2-difluoroethylene, and the third component is 1%-10% of trans-1,3,3,3-tetrafluoropropylene.

[0028] In an optional implementation, the mixed refrigerant consists of a first component, a second component and a third component, the first component is 3,3,3-trifluoropropyne, the second component is trans-1,2-difluoroethylene, and the third component is dimethyl ether and trans-1,3,3,3-tetrafluoropropylene.

[0029] In an optional implementation, the first component is composed of 4%-32% 3,3,3-trifluoropropyne, the second component is composed of 8%-16% trans-1,2-difluoroethylene, and the third component is composed of 48%-72% dimethyl ether and 8%-28% trans-1,3,3,3-tetrafluoropropylene, by mass percentage.

[0030] This embodiment also proposes a composition, which includes a lubricant and the mixed refrigerant described above, wherein the lubricant is selected from at least one substance or a combination of at least two substances selected from silicone oil, polyalkylbenzene (PAB), polyol ester (POE), polyalkylene glycol (PAG), polyalkylene glycol ester (PAG ester), polyvinyl ether (PVE), poly(α-olefin).

[0031] This embodiment also provides a refrigeration system, which uses the mixed refrigerant described above, or uses the composition described above. The refrigeration system of this embodiment can be used as a refrigeration system for an air conditioner, and can also be used as a refrigeration system for a refrigerator.

[0032] Specifically, the refrigeration system of this embodiment includes a compressor, a condenser, a throttling device and an evaporator, wherein the exhaust port of the compressor is connected to the air inlet of the condenser through a refrigerant pipeline, the air outlet of the condenser is connected to the air inlet of the throttling device through a refrigerant pipeline, the air outlet of the throttling device is connected to the air inlet of the evaporator through a refrigerant pipeline, and the air outlet of the evaporator is connected to the air intake of the compressor through a refrigerant pipeline. The mixed refrigerant proposed in the above embodiment flows through the refrigerant pipeline.

[0033] Among them: The compressor is the core component of the refrigeration system. Its main function is to suck in low-temperature and low-pressure gaseous refrigerant, discharge high-temperature and high-pressure gaseous refrigerant after compression, and provide power for the circulation of refrigerant in the system. The types of compressors include piston type, screw type, centrifugal type, etc. Different types of compressors are suitable for different refrigeration needs and occasions.

[0034] The function of the condenser is to cool and condense the high-temperature and high-pressure gaseous refrigerant into high-pressure liquid refrigerant. In this process, the refrigerant releases a large amount of heat, which is usually taken away by cooling media such as air or water. The condenser structure can be composed of pipes and heat sinks to increase the heat dissipation area and improve the cooling efficiency.

[0035] The main function of the throttling device is to throttle and reduce the pressure of high-pressure liquid refrigerant, turning it into low-temperature and low-pressure liquid refrigerant, and then entering the evaporator. The types of throttling devices include capillary tubes, thermal expansion valves, electronic expansion valves, etc. Different throttling devices have different adjustment performance and application range.

[0036] The evaporator is a device in a refrigeration system that absorbs heat from the surrounding environment and evaporates the low-temperature, low-pressure liquid refrigerant into a low-temperature, low-pressure gaseous refrigerant, thereby achieving the purpose of refrigeration. The evaporator is usually composed of pipes and fins to increase the contact area with the air or the object being cooled and improve the heat exchange efficiency.

[0037] The embodiment of the present application also provides a refrigeration device, which uses the refrigeration system described above. The refrigeration device is, for example, any one of a refrigerator, a central air conditioner, a heat pump air conditioner, and a household air conditioner.

[0038] The performance of the mixed refrigerant of this embodiment is described in detail below in combination with specific embodiments and comparative examples.

[0039] The first component of the mixed refrigerant of this embodiment is TFP, the second component is R1132(E), and the third component is at least one of RE170 or R1234ze(E). The components are physically mixed in a liquid state at room temperature according to a mass ratio, and the sum of the mass percentages of the components is 100%. The basic parameters of the components are shown in Table 1.

[0040] Table 1: Basic parameters of each component

[0041]

[0042] In Example 1 to Example 22, and Comparative Example 1 to Comparative Example 4, the components are mixed in different proportions to prepare different mixed refrigerants. The formulas of the different mixed refrigerants are shown in Table 2.

[0043] Table 2: Formulas of different mixed refrigerants

[0044]

[0045]

[0046] Under the design working conditions: the evaporation temperature of the evaporator is 10°C, the condensation temperature of the condenser is 40°C, the gas phase at the evaporator outlet is in a superheated state with a superheat degree of 5°C, the liquid phase at the condenser outlet is in a subcooled state with a subcooling degree of 5°C, and the adiabatic efficiency of the compressor is 0.75. The cycle performance parameters of the above-mentioned embodiments 1 to 21, comparative examples 1 to 4 and R134a refrigerant in the refrigeration system are respectively used for theoretical calculations. The physical property data are all taken from REFPROP 10.0. The GWP (calculated by linear addition of mass percentage), relative unit volume cooling / heating capacity Qv (ratio with unit volume cooling / heating capacity of R134a), relative coefficient of performance COP (ratio with coefficient of performance of R134a), atmospheric boiling point (bubble point temperature) and temperature glide are compared. The comparison results are shown in Table 3 below:

[0047] Table 3: Performance comparison of different mixed refrigerants and R134a

[0048]

[0049]

[0050] From the above results, it can be seen that the GWP of the mixed refrigerants of Examples 1 to 22 is less than 10, which can fully meet the current Kigali Amendment's limit control requirements for refrigerants. The relative volumetric cooling capacity and relative performance coefficient of all refrigerant formulations are greater than 0.9, and the maximum volumetric cooling capacity is increased by 110% compared with R134a, and the temperature glide is within 5°C, which is a small temperature glide.

[0051] Comparative Examples 1-4 are not within the mass ratio provided in this embodiment, the relative volumetric cooling capacity and relative performance coefficient are relatively small, and the temperature glide is relatively large.

[0052] As described above, the mixed refrigerant provided in this embodiment has a GWP of less than 10, and a volumetric cooling capacity that is better than R134a, and a thermal performance that is comparable to or even better than that of R134a refrigerant, and can be a good substitute for R134a.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mixed refrigerant, characterized in that: The mixed refrigerant includes a first component, a second component and a third component; wherein the first component includes 3,3,3-trifluoropropyne, the second component includes trans-1,2-difluoroethylene, and the third component includes at least one of dimethyl ether and trans-1,3,3,3-tetrafluoropropylene.

2. A mixed refrigerant according to claim 1, characterized in that: The mixed refrigerant consists of a first component, a second component and a third component, wherein the first component is 3,3,3-trifluoropropyne, the second component is trans-1,2-difluoroethylene, and the third component is dimethyl ether.

3. A mixed refrigerant according to claim 2, characterized in that: In terms of mass percentage, the first component is 1%-56% of 3,3,3-trifluoropropyne, the second component is 1%-28% of trans-1,2-difluoroethylene, and the third component is 40%-92% of dimethyl ether.

4. A mixed refrigerant according to claim 1, characterized in that: The mixed refrigerant consists of a first component, a second component and a third component, wherein the first component is 3,3,3-trifluoropropyne, the second component is trans-1,2-difluoroethylene, and the third component is trans-1,3,3,3-tetrafluoropropylene.

5. A mixed refrigerant according to claim 4, characterized in that: In terms of mass percentage, the first component is 4%-88% of 3,3,3-trifluoropropyne, the second component is 4%-92% of trans-1,2-difluoroethylene, and the third component is 1%-10% of trans-1,3,3,3-tetrafluoropropylene.

6. A mixed refrigerant according to claim 1, characterized in that: The mixed refrigerant consists of a first component, a second component and a third component, wherein the first component is 3,3,3-trifluoropropyne, the second component is trans-1,2-difluoroethylene, and the third component is dimethyl ether and trans-1,3,3,3-tetrafluoropropylene.

7. A mixed refrigerant according to claim 6, characterized in that: In terms of mass percentage, the first component is 4%-32% of 3,3,3-trifluoropropyne, the second component is 8%-16% of trans-1,2-difluoroethylene, and the third component is 48%-72% of dimethyl ether and 8%-28% of trans-1,3,3,3-tetrafluoropropylene.

8. A composition, characterized in that The composition comprises a lubricant and the mixed refrigerant according to any one of claims 1 to 7.

9. A refrigeration system, characterized in that: The refrigeration system uses the mixed refrigerant described in any one of claims 1 to 7, or uses the composition described in claim 8.

10. A refrigeration device, characterized in that: The refrigeration equipment adopts the refrigeration system described in claim 9.

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