阅读说明：本技术 一种环保混合制冷剂及其应用 (Environment-friendly mixed refrigerant and application thereof ) 是由 何国庚 刘菁菁 于 2021-09-07 设计创作，主要内容包括：本发明属于混合制冷剂技术领域,具体涉及一种环保混合制冷剂及其应用。该环保混合制冷剂由以下质量百分比的各组分组成：丙烯为25％～60％,六氟丙烯为75％～40％。本发明所提供的制冷剂为环保制冷剂,可用于直接替代R404A,无需更换制冷部件,密度只有R404A的65％-87％左右,制冷剂充灌量少,液体粘度只有R404A的50-80％左右,流动阻力小,耗功低,液体的导热系数是R404A的1.12-1.5倍,传热性能好,传热效率高。本发明ODP值为0,GWP值低于5,环保优势突出,并且R1216不可燃,可进一步抑制R1270的可燃性,拥有广阔的应用前景,本发明也可用于替代R507和R22。(The invention belongs to the technical field of mixed refrigerants, and particularly relates to an environment-friendly mixed refrigerant and application thereof. The environment-friendly mixed refrigerant consists of the following components in percentage by mass: 25 to 60 percent of propylene and 75 to 40 percent of hexafluoropropylene. The refrigerant provided by the invention is an environment-friendly refrigerant, can be used for directly replacing R404A, does not need to replace a refrigeration part, has the density of only about 65-87% of R404A, small refrigerant filling amount, liquid viscosity of only about 50-80% of R404A, small flow resistance, low power consumption, good heat transfer performance and high heat transfer efficiency, and has the heat conductivity coefficient of liquid of 1.12-1.5 times that of R404A. The ODP value of the invention is 0, the GWP value is lower than 5, the environmental protection advantage is outstanding, R1216 is not flammable, the flammability of R1270 can be further inhibited, the invention has wide application prospect, and the invention can also be used for replacing R507 and R22.)

1. The environment-friendly mixed refrigerant is characterized by comprising the following components in percentage by mass: 25 to 60 percent of propylene and 75 to 40 percent of hexafluoropropylene.

2. The environment-friendly mixed refrigerant according to claim 1, which is characterized by comprising the following components in percentage by mass: 25% of propylene and 75% of hexafluoropropylene.

3. The environment-friendly mixed refrigerant according to claim 1, which is characterized by comprising the following components in percentage by mass: 35% of propylene and 65% of hexafluoropropylene.

4. The environment-friendly mixed refrigerant according to claim 1, which is characterized by comprising the following components in percentage by mass: the propylene content was 45% and the hexafluoropropylene content was 55%.

5. The environment-friendly mixed refrigerant according to claim 1, which is characterized by comprising the following components in percentage by mass: 58% of propylene and 42% of hexafluoropropylene.

6. Use of an environmentally friendly mixed refrigerant according to any one of claims 1 to 5, wherein: for replacing R404A or R22 refrigerants.

7. Use of an environmentally friendly mixed refrigerant according to any one of claims 1 to 5, wherein: as a refrigerant for freezing and refrigeration, household air-conditioning, central air-conditioning, ship refrigeration equipment, mobile cold storage or freezing and condensing units.

Technical Field

The invention belongs to the technical field of mixed refrigerants, and particularly relates to an environment-friendly mixed refrigerant and application thereof.

Background

R404A (R125/R143a/R134a mixture) is an important mixed refrigerant and has wide application in the field of low-temperature freezing and refrigeration. Although this refrigerant has no ozone depletion potential (ODP ═ 0), it has a very high global warming potential (GWP ═ 3922). HFCs refrigerants with higher global warming potential have been listed in the curtailment catalog of the basal gality amendments of montreal protocol, conducted in 2016 and beginning in 2019, and are only used as transition refrigerants and cannot be finally replaced. And R404A, which is one of the refrigerants having high global warming potentials among HFCs refrigerants, is also one of the refrigerants that is currently being descaled urgently. In the prior art, hydrocarbon refrigerants (HCs) are natural refrigerants without potential hazards of synthetic refrigerants, have ODP values of 0 and very low GWP values, are environmentally friendly and widely favored, and are considered as excellent choices for replacing refrigerants. However, HCs are flammable and explosive, and thus have limited use in refrigeration systems. Meanwhile, hexafluoropropylene (R1216) has the incombustible characteristic. Therefore, the refrigerant replacement of RR404A is currently performed, and mixed refrigerant is one of the main ideas.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides an environment-friendly mixed refrigerant and application thereof. The refrigerant provided by the invention is an environment-friendly refrigerant, can be used for directly replacing R404A, does not need to replace a refrigeration part, has the density of only about 65-87% of R404A, small refrigerant filling amount, liquid viscosity of only about 50-80% of R404A, small flow resistance, low power consumption, good heat transfer performance and high heat transfer efficiency, and has the heat conductivity coefficient of liquid of 1.12-1.5 times that of R404A. The ODP value of the invention is 0, the GWP value is lower than 5, the environmental protection advantage is outstanding, R1216 is not flammable, the flammability of R1270 can be further inhibited, the invention has wide application prospect, and the invention can also be used for replacing R507 and R22.

The technical scheme provided by the invention is as follows:

an environment-friendly mixed refrigerant is composed of the following components in percentage by mass: 25 to 60 percent of propylene (R1270) and 75 to 40 percent of hexafluoropropylene (R1216). The environment-friendly mixed refrigerant is a binary mixed refrigerant.

Table 1 gives the relevant parameters for two refrigerants:

table 1: physical property parameters of R1270 and R1216

Parameter(s)	R1270	R1216
			Molecular formula	C3H6	C3F6
Relative molecular mass	42.09	150.023
			Latent heat of vaporization kJ/kg (1atm)	438.9	140.98
Normal boiling point deg.C	-47.7	-30.34
			Freezing point deg.C	-185	-152.6
Critical pressure kPa	4618	3149.5
			Critical temperature of	91.8	85.75
Critical density kg/m3	220.4	583.4
			Combustibility	Easy combustible	Non-combustible
ODP	0	0
			GWP	5	<1

Specifically, the environment-friendly mixed refrigerant comprises the following components in percentage by mass: 25% of propylene and 75% of hexafluoropropylene.

Specifically, the environment-friendly mixed refrigerant comprises the following components in percentage by mass: 35% of propylene and 65% of hexafluoropropylene.

Specifically, the environment-friendly mixed refrigerant comprises the following components in percentage by mass: the propylene content was 45% and the hexafluoropropylene content was 55%.

Specifically, the environment-friendly mixed refrigerant comprises the following components in percentage by mass: 58% of propylene and 42% of hexafluoropropylene.

The environment-friendly mixed refrigerant provided by the invention can be prepared by mixing the following steps: according to the proportion, the mixture is filled into a refrigerant tank in a gas state or a liquid state in the sequence of R1216 and R1270, then is uniformly mixed, and finally is filled into a refrigeration system; or according to the weight ratio, pouring the mixture into a compressor in the order of R1216 and R1270, and mixing uniformly for use.

The invention also provides application of the environment-friendly mixed refrigerant, which is used for replacing R404A or R22 refrigerants. Preferably, it is used to replace R404A refrigerant.

The invention also provides application of the environment-friendly mixed refrigerant, which is used as a refrigerant for freezing and refrigerating, household air conditioners, central air conditioners, ship refrigeration equipment, mobile refrigeration houses or freezing and condensing units.

The environment-friendly refrigerant provided by the invention has the following beneficial effects:

1. as shown in Table 1, the refrigerants R1270 and R1216 used in the invention have ODP value of 0 and extremely low GWP value, conform to the F-gas regulation of European Union, and are environment-friendly and wide in application prospect compared with R404A and R507.

2. The mass fraction of R1270 is in the range of 25-60% and the mass fraction of R1216 is in the range of 75-40%, which indicates that the binary mixed refrigerant of R1270/R1216 is non-azeotropic refrigerant, near-azeotropic refrigerant or azeotropic refrigerant in the range.

3. R1216 is a non-flammable refrigerant, can inhibit its combustibility effectively with R1270 mixing, improve the safety performance of the refrigerating system, and the invention and R404A under the same working condition, its evaporation pressure is similar to condensing pressure, the flow resistance is small, do not need to change too many parts of the refrigeration plant, can substitute directly.

Detailed Description

The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.

In the specific implementation of the invention, the refrigerants R1270 and R1216 are commonly used in the technical field of refrigeration and low temperature, wherein the mass percentage concentration of R1270 is 25-60%, the mass percentage concentration of R1216 is 75-40%, and the specific examples are as follows:

example one

Taking R1270 and R1216 refrigerants commonly used in the refrigerant field, and fully and physically mixing 25 mass percent of R1270 and 75 mass percent of R1216 in a liquid phase state to obtain a non-azeotropic mixed refrigerant.

Example two

Taking R1270 and R1216 refrigerants commonly used in the refrigerant field, and fully and physically mixing the R1270 with the mass percent of 35% and the R1216 with the mass percent of 65% in a liquid phase state to obtain a near-azeotropic mixed refrigerant.

EXAMPLE III

R1270 and R1216 refrigerants commonly used in the refrigerant field are taken, and in a liquid phase state, 45 mass percent of R1270 and 55 mass percent of R1216 are fully and physically mixed to obtain a near-azeotropic mixed refrigerant.

Example four

R1270 and R1216 refrigerants commonly used in the refrigerant field are taken, and in a liquid phase state, 58 mass percent of R1270 and 42 mass percent of R1216 are fully and physically mixed to obtain the azeotropic mixed refrigerant.

For comparing the performance, the theoretical cycle calculation of the air conditioning system is carried out by using the embodiment and R404A, and the design working conditions of the air conditioner are taken as follows: the evaporation temperature is-40 ℃, the condensation temperature is 40 ℃, the outlet temperature of the condenser is 35 ℃, the outlet temperature of the evaporator is-35 ℃, and the compressor process is isentropic compression. The resulting calculated parameters are shown in table 2 below:

table 2: R404A and the calculation parameters of the theoretical cycle of the embodiment

According to the theoretical calculation result of the standard working condition, the following can be obtained: 1. under the same working condition, the R404A is relatively close to the evaporation pressure and the condensation pressure of the invention, so that only the refrigerant needs to be replaced in practical application without replacing other components, and the pressure ratio of the invention is slightly lower than that of the R404A, which shows that the consumption of the compressor can be reduced and the service life of the refrigeration system can be prolonged by using the invention; 2. although the theoretical thermodynamic refrigeration coefficient of the first embodiment of the invention is slightly less than R404A, the theoretical thermodynamic refrigeration coefficients of the second embodiment, the third embodiment and the fourth embodiment of the invention are all larger than R404A, and the liquid of the invention has small density, small viscosity, small flow resistance, low power consumption, large heat conductivity coefficient and high heat transfer efficiency, thereby having higher actual refrigeration coefficient; 3. the R1270 and R1216 refrigerants used in the invention are both environment-friendly refrigerants, have no ozone layer hazard and extremely low greenhouse effect influence, meet the current use requirements, and the incombustible R1216 can effectively inhibit the inflammable and explosive characteristics of R1270, thus having wide application prospect. The invention can be widely applied to various fields of refrigeration directions, including refrigeration devices such as refrigeration and cold storage, central air conditioning, automobile air conditioning, ship refrigeration systems and the like, and is particularly suitable for replacing R404A.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.