Multi-element mixed refrigerant suitable for-150 DEG C cryogenic temperature zone

Abstract

The invention discloses a multi-component mixed refrigerant suitable for a-150 DEG C cryogenic temperature zone, which comprises a first group of substances, a second group of substances, a fifth group of substances, a third group of substances, a fourth group of substances or one of the substances, and the first group of substances is R728, R740, He or a mixture thereof; the second group of substances is R14, R50, R784 or a mixture thereof; the third group of substances are R23, R1150, R41, R744 and Xe or a mixture of at least two of the R23, the R1150, the R41, the R744 and the Xe; the fourth group of substance is R170, perfluoro R290, R1270, R1216, R125, R1270 propadiene or a mixture of at least two substances of the R170, the perfluoro R290, the R1270, the R1216, the R125 and the R1270 propadiene; and the fifth group of substances is R227ea, R3110, R254cb, R347mcc, R338mcf, R338mcc, R1234ZE (E), R600a, R152a or a mixture of at least two of the R227ea, the R3110, the R254cb, the R347mcc, the R338mcf, the R338mcc, the R1234ZE (E), the R600a and the R152a.

Description

Technical Field

[0001] This invention relates to the field of refrigerant technology, and more specifically to a multi-component mixed refrigerant suitable for cryogenic temperatures down to -150°C. Background Technology

[0002] Achieving -150℃ cryogenic cooling in related technologies typically requires the use of two or more external cascade refrigeration cycles or multi-component self-cascade (ACR) refrigeration systems. However, these systems are complex, inefficient, unreliable, and prone to failure. To address these issues, non-azeotropic multi-component refrigerants can be used. These refrigerants can be applied to simpler regenerative single-component cycle (LHR) refrigeration systems, achieving -150℃ cryogenic cooling efficiently and reliably.

[0003] The operating temperature range of non-azeotropic multi-component mixed refrigerants provided by related technologies is generally around 10-25K (Kelvin). Beyond this range, efficiency and reliability drop sharply, and it may even be difficult to obtain the required storage temperature. In other words, the multi-component mixed refrigerants provided by related technologies cannot be used efficiently and reliably in refrigeration systems in the -150℃ temperature range.

[0004] Existing technologies have achieved cryogenic multi-component mixed refrigerants composed of R728, R740, R14, R23, and other high-boiling-point substances. However, the high-boiling-point components in these mixed refrigerants either contain substances with ozone depletion potential (ODP), such as R142b, or hydrofluorocarbons with high global warming potential (GWP), such as R236fa, both of which affect their environmental performance. Furthermore, most HFCs and FCs have poor miscibility with lubricating oils, and the high-boiling-point HFCs and FCs also have high freezing points. Moreover, their mixed refrigerants have poor low-temperature oil solubility. Therefore, these mixed refrigerants are generally used in multi-stage automatic cascade refrigeration systems, and multi-stage vapor-liquid separation devices are required to separate the lubricating oil and components with high freezing points in higher temperature ranges to ensure normal system operation, which significantly increases the system's complexity. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-component mixed refrigerant suitable for the cryogenic temperature range of -150°C. This refrigerant is applicable to a simpler regenerative heat exchange type single-component cycle (LHR) refrigeration system, while enabling the compressor of the refrigeration system to have good and reliable operating conditions.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a multi-component mixed refrigerant suitable for the -150℃ cryogenic temperature range, comprising a first group of substances, a second group of substances, a fifth group of substances, and a third group of substances, a fourth group of substances, or one of them, wherein: The first group of substances is R728, R740, He, or a mixture thereof; The second group of substances consists of R14, R50, R784 or mixtures thereof; The third group of substances consists of R23, R1150, R41, R744, Xe, or a mixture of at least two of these substances; The fourth group of substances consists of R170, perfluorinated R290, R1270, R1216, R125, R1270 propylene, or a mixture of at least two of these substances; The fifth group of substances consists of R227ea, R3110, R254cb, R347mcc, R338mcf, R338mcc, R1234ZE(E), R600a, R152a, or a mixture of at least two of these substances.

[0007] Furthermore, the sum of the molar concentrations of the first group of substances, the second group of substances, the fifth group of substances, the third group of substances, the fourth group of substances, or one of them, is 100%; The total molar concentration of the first group of substances is 3%-15%; The total molar concentration of the second group of substances is 15%-35%; The total molar concentration of the fifth group of substances is 35%-65%; The total molar concentration of at least one of the substances in the third group and the fourth group is the balance.

[0008] Furthermore, the sum of the molar concentrations of the first group of substances, the second group of substances, the fifth group of substances, the third group of substances, the fourth group of substances, or one of them, is 100%; The total molar concentration of the first group of substances is 3%-15%; The molar concentration of the second group of substances is 15%-35%; The total molar concentration of the third group of substances is 10%-35%; The total molar concentration of the fourth group of substances is 10%-40%; The total molar concentration of the fifth group of substances is 35%-65%.

[0009] Furthermore, the total molar concentration of the first group of substances is 5%-10%; The total molar concentration of the second group of substances is 15%-30%; The total molar concentration of the third group of substances is 15%-35%; The total molar concentration of the fourth group of substances is 15%-40%; The total molar concentration of the fifth group of substances is the balance.

[0010] Furthermore, the total molar concentration of the first group of substances is 8%-12%; The total molar concentration of the second group of substances is 22%-30%; The total molar concentration of the third group of substances is 15%-30%; The total molar concentration of the fourth group of substances is 15%-30%; The total molar concentration of the fifth group of substances is 40%-55%.

[0011] Furthermore, the total molar concentration of the first group of substances is 3%-8%; The total molar concentration of the second group of substances is 15%-25%; The total molar concentration of the third group of substances is 15%-28%; The total molar concentration of the fourth group of substances is 13%-22%; The total molar concentration of the fifth group of substances is 35%-51%.

[0012] Furthermore, the total molar concentration of the first group of substances is 3%-8%; The total molar concentration of the second group of substances is 15%-20%; The total molar concentration of the third group of substances is 13%-20%; The total molar concentration of the fourth group of substances is 14%-22%; The total molar concentration of the fifth group of substances is the balance.

[0013] Furthermore, the sum of the molar concentrations of the first group of substances, the second group of substances, the fifth group of substances, and the third group of substances is 100%; The total molar concentration of the first group of substances is 3%-15%; The total molar concentration of the second group of substances is 15%-35%; The total molar concentration of the fifth group of substances is 35%-65%; The total molar concentration of the third group of substances is the balance.

[0014] Furthermore, the sum of the molar concentrations of the first group of substances, the second group of substances, the fifth group of substances, and the fourth group of substances is 100%; The total molar concentration of the first group of substances is 3%-15%; The total molar concentration of the second group of substances is 15%-35%; The total molar concentration of the fifth group of substances is 35%-65%; The total molar concentration of the fourth group of substances is the balance.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The refrigerant of the present invention includes a variety of raw materials to form a non-azeotropic multi-component mixed refrigerant; the various components of the refrigerant form different concentration ratios at different temperature ranges from ambient temperature to refrigeration temperature, and have different thermophysical properties, thereby producing different phase change evaporation effects and forming a stepped refrigeration property. The refrigerant can be applied to a simpler regenerative heat exchange type single-component cycle (LHR) refrigeration system, while enabling the compressor of the refrigeration system to have good and reliable operating conditions. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Examples 1-3: The present invention provides a multi-component mixed refrigerant suitable for cryogenic temperatures down to -150°C, with a minimum heat transfer temperature difference of 1K inside the heat exchanger and an ambient temperature of 32°C. The concentration and performance of the multi-component mixed refrigerant are shown in the table below:

[0018] Examples 4-6: The present invention provides a multi-component mixed refrigerant suitable for cryogenic temperatures down to -150°C, with a minimum heat transfer temperature difference of 1K inside the heat exchanger and an ambient temperature of 32°C. The concentration and performance of the multi-component mixed refrigerant are shown in the table below:

[0019] Examples 7-9: The present invention provides a multi-component mixed refrigerant suitable for cryogenic temperatures down to -150°C, with a minimum heat transfer temperature difference of 1K inside the heat exchanger and an ambient temperature of 32°C. The concentration and performance of the multi-component mixed refrigerant are shown in the table below:

[0020] Examples 10-12: The present invention provides a multi-component mixed refrigerant suitable for cryogenic temperatures down to -150°C, with a minimum heat transfer temperature difference of 1K inside the heat exchanger and an ambient temperature of 32°C. The concentration and performance of the multi-component mixed refrigerant are shown in the table below:

[0021] Examples 13-15: The present invention provides a multi-component mixed refrigerant suitable for cryogenic temperatures down to -150°C, with a minimum heat transfer temperature difference of 1K inside the heat exchanger and an ambient temperature of 32°C. The concentration and performance of the multi-component mixed refrigerant are shown in the table below:

[0022] Examples 16-18: The present invention provides a multi-component mixed refrigerant suitable for cryogenic temperatures down to -150°C, with a minimum heat transfer temperature difference of 1K inside the heat exchanger and an ambient temperature of 32°C. The concentration and performance of the multi-component mixed refrigerant are shown in the table below:

[0023] In summary, the refrigerant of the present invention is a non-azeotropic multi-component mixed refrigerant, which is suitable for the temperature range of -150°C, and the refrigerant can be used in a regenerative heat exchange type single-component cycle (LHR) refrigeration system to enable the compressor of the refrigeration system to have good operating conditions.

[0024] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A multi-component mixed refrigerant suitable for use in the cryogenic temperature range of -150°C, characterized in that, comprises a first group of substances, a second group of substances, a fifth group of substances, and a third group of substances, a fourth group of substances, or one of them, wherein: the first group of substances is R728, R740, He, or a mixture thereof; the second group of substances is R14, R50, R784, or a mixture thereof; the third group of substances is R23, R1150, R41, R744, Xe, or a mixture of at least two of them; the fourth group of substances is R170, perfluoro R290, R1270, R1216, R125, R1270 propadiene, or a mixture of at least two of them; the fifth group of substances is R227ea, R3110, R254cb, R347mcc, R338mcf, R338mcc, R1234ZE(E), R600a, R152a, or a mixture of at least two of them.

2. The multi-component mixed refrigerant suitable for use in the cryogenic temperature range of -150°C according to claim 1, characterized in that, the sum of the molar concentrations of the first group of substances, the second group of substances, the fifth group of substances, and the third group of substances, the fourth group of substances, or one of them is 100%; the total molar concentration of the first group of substances is 3%-15%; the total molar concentration of the second group of substances is 15%-35%; the total molar concentration of the fifth group of substances is 35%-65%; the total molar concentration of at least one of the third group of substances and the fourth group of substances is the balance.

3. The multi-component mixed refrigerant suitable for use in the cryogenic temperature range of -150°C according to claim 2, characterized in that, the sum of the molar concentrations of the first group of substances, the second group of substances, the fifth group of substances, and the third group of substances, the fourth group of substances, or one of them is 100%; the total molar concentration of the first group of substances is 3%-15%; the total molar concentration of the second group of substances is 15%-35%; the total molar concentration of the third group of substances is 10%-35%; the total molar concentration of the fourth group of substances is 10%-40%; the total molar concentration of the fifth group of substances is 35%-65%.

4. The multi-component mixed refrigerant suitable for use in the cryogenic temperature range of -150°C according to claim 3, characterized in that, the total molar concentration of the first group of substances is 5%-10%; the total molar concentration of the second group of substances is 15%-30%; the total molar concentration of the third group of substances is 15%-35%; the total molar concentration of the fourth group of substances is 15%-40%; the total molar concentration of the fifth group of substances is the balance.

5. The multi-component mixed refrigerant suitable for use in the cryogenic temperature range of -150°C according to claim 3, characterized in that, the total molar concentration of the first group of substances is 8%-12%; the total molar concentration of the second group of substances is 22%-30%; the total molar concentration of the third group of substances is 15%-30%; the total molar concentration of the fourth group of substances is 15%-30%; the total molar concentration of the fifth group of substances is 40%-55%.

6. The multi-component mixed refrigerant suitable for use in the cryogenic temperature range of -150°C according to claim 3, characterized in that, the total molar concentration of the first group of substances is 3%-8%; the total molar concentration of the second group of substances is 15%-25%; the total molar concentration of the third group of substances is 15%-28%; the total molar concentration of the fourth group of substances is 13%-22%; the total molar concentration of the fifth group of substances is 35%-51%.

7. The multi-component mixed refrigerant suitable for use in the cryogenic temperature range of -150°C according to claim 3, characterized in that, the total molar concentration of the first group of substances is 3%-8%; the total molar concentration of the second group of substances is 15%-20%; the total molar concentration of the third group of substances is 13%-20%; the total molar concentration of the fourth group of substances is 14%-22%; the total molar concentration of the fifth group of substances is the balance.

8. The multi-component mixed refrigerant suitable for use in the cryogenic temperature range of -150°C according to claim 2, characterized in that, the sum of the molar concentrations of the first group of substances, the second group of substances, the fifth group of substances, and the third group of substances is 100%; the total molar concentration of the first group of substances is 3%-15%; The total molar concentration of the second group of substances is 15-35%; The total molar concentration of the fifth group of substances is 35-65%; The total molar concentration of the third group of substances is the balance.

9. The multi-component mixed refrigerant suitable for use in the cryogenic temperature range of -150°C according to claim 2, characterized in that, The sum of the molar concentrations of the first group of substances, the second group of substances, the fifth group of substances and the fourth group of substances is 100%; The total molar concentration of the first group of substances is 3-15%; The total molar concentration of the second group of substances is 15-35%; The total molar concentration of the fifth group of substances is 35-65%; The total molar concentration of the fourth group of substances is the balance.

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