阅读说明：本技术 一种含有二氧化碳及氟乙烷的三元混合工质 (Ternary mixed working medium containing carbon dioxide and fluoroethane ) 是由 舒歌群 孙瑞 田华 石凌峰 王轩 于 2021-09-14 设计创作，主要内容包括：本发明公开了一种含有二氧化碳及氟乙烷的三元混合工质,包括二氧化碳及氟乙烷,其中,所述二氧化碳的质量百分比浓度30％～80％,氟乙烷的质量百分比浓度为10％～60％。本发明提供的三元混合工质,适用于跨临界动力循环,其臭氧损耗潜值ODP为零,不可燃,长期使用不会对大气臭氧层造成损害,且全球变暖潜值GWP均小于150。(The invention discloses a ternary mixed working medium containing carbon dioxide and fluoroethane, which comprises carbon dioxide and fluoroethane, wherein the mass percent concentration of the carbon dioxide is 30-80%, and the mass percent concentration of the fluoroethane is 10-60%. The ternary mixed working medium provided by the invention is suitable for transcritical power circulation, the ozone loss potential value ODP of the ternary mixed working medium is zero, the ternary mixed working medium is non-flammable, the ozone layer of the atmosphere cannot be damaged after long-term use, and the global warming potential value GWP is less than 150.)

1. A ternary mixed working medium containing carbon dioxide and fluoroethane is characterized in that: the composite material comprises carbon dioxide, fluoroethane and a third component, wherein the third component is one of difluoromethane, trifluoroethylene and 3,3, 3-trifluoropropene, and the sum of the mass percent concentrations of the carbon dioxide, the fluoroethane and the third component is 100%, wherein the mass percent concentration of the carbon dioxide is 30-80%, and the mass percent concentration of the fluoroethane is 10-60%.

2. The ternary mixed working fluid containing carbon dioxide and fluoroethane according to claim 1, wherein: the third component is difluoromethane, and the mass percent of the carbon dioxide, the fluoroethane and the difluoromethane is 30-80%: 10-60%: 10-20%, the sum of the mass percent of each component is 100%, and the global warming potential is less than 150.

3. The ternary mixed working fluid containing carbon dioxide and fluoroethane according to claim 1, wherein: the third component is trifluoroethylene, and the mass percentages of the carbon dioxide, the fluoroethane and the trifluoroethylene are 30-80%: 10-60%: 10-60%, the sum of the mass percent of each component is 100%, and the global warming potential is less than 150.

4. The ternary mixed working fluid containing carbon dioxide and fluoroethane according to claim 1, wherein: the third component is 3,3, 3-trifluoropropene, and the mass percentages of the carbon dioxide, the fluoroethane and the 3,3, 3-trifluoropropene are 30-80%: 10-60%: 10-60%, the sum of the mass percent of each component is 100%, and the global warming potential is less than 150.

Technical Field

The invention relates to the technical field of thermodynamic cycle, in particular to a ternary mixed working medium containing carbon dioxide and fluoroethane.

Background

The greenhouse effect is a great challenge facing all countries around the world in this century. To achieve the goal of "carbon peak-to-peak, carbon neutralization", control of substances that may produce significant greenhouse effects is required. To solve this problem, China has formally accepted the correction of Bulgaria. Hydrofluorocarbons (HFC) are widely used circulating working media at present, but the working media often have larger Global Warming Potential (GWP)>150). To meet the requirements of the Bulgarian correction, there is a need in the field of power cycles or refrigeration cycles to develop high efficiencies with zero Ozone Depletion Potential (ODP) and Global Warming Potential (GWP) of less than 150Instead of working fluid. Hydrofluoroolefins (HFOs) are unsaturated organics composed of carbon, hydrogen and fluorine and generally exhibit zero ODP and very low GWP. However, hydrofluoroolefins tend to have some flammability. Carbon dioxide (CO)₂) As a natural working medium, the potential value of global warming is only 1, and the flame retardant has obvious flame retardant effect. Although fluoroethane (R161) is used as a hydrofluorocarbon working medium, the global warming potential of fluoroethane (R161) is only 12, and the fluoroethane (R161) has excellent cycle performance and is one of cycle working mediums with remarkable application prospects. Carbon dioxide with flame retardance, fluoroethane with excellent cycle performance and hydrofluoroolefin with excellent environmental protection performance are mixed according to a certain proportion to form a mixed working medium, the advantages of the three working media are mutually compensated, and finally the working medium meeting the power cycle application requirement is formed.

Disclosure of Invention

In view of the above, there is a need to provide a mixture with high thermal efficiency, which is completely free from ozone layer damage, has a Global Warming Potential (GWP) of less than 150, and is non-flammable.

In order to achieve the purpose, the invention adopts the following technical scheme:

a ternary mixed working medium containing carbon dioxide and fluoroethane comprises: the mass percentage concentration sum of each component in the ternary mixed working medium is 100%, wherein the mass percentage concentration of the carbon dioxide is 30-80%, and the mass percentage concentration of the fluoroethane is 10-60%. The third component is one of difluoromethane (R32), trifluoroethylene (R1123), 3,3, 3-trifluoropropene (R1243 zf).

The ternary mixed working medium comprises carbon dioxide, fluoroethane and difluoromethane, and the mass percentages of the carbon dioxide, the fluoroethane and the difluoromethane are 30-80%: 10-60%: 10-20% and the global warming potential is less than 150.

The ternary mixed working medium comprises carbon dioxide, fluoroethane and trifluoroethylene, and the mass percentages of the carbon dioxide, the fluoroethane and the trifluoroethylene are 30-80%: 10-60%: 10-60% and the global warming potential is less than 150.

The ternary mixed working medium comprises carbon dioxide, fluoroethane and 3,3, 3-trifluoropropene, and the mass percentages of the carbon dioxide, the fluoroethane and the 3,3, 3-trifluoropropene are 30-80%: 10-60%: 10-60% and the global warming potential is less than 150.

The invention has the advantages that: the ternary mixed working medium provided by the invention comprises carbon dioxide and fluoroethane, wherein the mass percentage concentration of the carbon dioxide is 30-80%, and the mass percentage concentration of the fluoroethane is 10-60%. The ternary mixed working medium provided by the invention is suitable for transcritical power circulation, the ozone loss potential value ODP of the ternary mixed working medium is zero, the ternary mixed working medium is non-flammable, the ozone layer of the atmosphere cannot be damaged after long-term use, and the global warming potential value GWP is less than 150.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a ternary mixed working medium, which comprises: the mass percentage concentration sum of each component in the ternary mixed working medium is 100%, wherein the mass percentage concentration of the carbon dioxide is 30-80%, and the mass percentage concentration of the fluoroethane is 10-60%.

The ternary mixed working medium provided by the invention is suitable for transcritical power circulation, the ozone loss potential value ODP of the ternary mixed working medium is zero, the ternary mixed working medium is non-flammable, the ozone layer of the atmosphere cannot be damaged after long-term use, and the global warming potential value GWP is less than 150.

The above technical means of the present invention will be described in detail with reference to examples.

Example 1: carbon dioxide with the mass percentage concentration of 80%, fluoroethane with the mass percentage concentration of 10% and difluoromethane with the mass percentage concentration of 10% are physically mixed at normal temperature to obtain a mixed working medium applicable to transcritical power circulation.

Example 2: carbon dioxide with the mass percentage concentration of 50%, fluoroethane with the mass percentage concentration of 30% and difluoromethane with the mass percentage concentration of 20% are physically mixed at normal temperature to obtain a mixed working medium applicable to transcritical power circulation.

Example 3: carbon dioxide with the mass percentage concentration of 30%, fluoroethane with the mass percentage concentration of 60% and difluoromethane with the mass percentage concentration of 10% are physically mixed at normal temperature to obtain a mixed working medium applicable to transcritical power circulation.

Example 4: and (2) taking 80% by mass of carbon dioxide, 10% by mass of fluoroethane and 10% by mass of trifluoroethylene to physically mix at normal temperature to obtain a mixed working medium applicable to transcritical power circulation.

Example 5: carbon dioxide with the mass percentage concentration of 50%, fluoroethane with the mass percentage concentration of 20% and trifluoroethylene with the mass percentage concentration of 30% are physically mixed at normal temperature to obtain a mixed working medium applicable to transcritical power circulation.

Example 6: carbon dioxide with the mass percentage concentration of 30%, fluoroethane with the mass percentage concentration of 60% and trifluoroethylene with the mass percentage concentration of 10% are physically mixed at normal temperature to obtain a mixed working medium applicable to transcritical power circulation.

Example 7: carbon dioxide with the mass percentage concentration of 80%, fluoroethane with the mass percentage concentration of 10% and 3,3, 3-trifluoropropene with the mass percentage concentration of 10% are physically mixed at normal temperature to obtain the mixed working medium applicable to the transcritical power cycle.

Example 8: carbon dioxide with the mass percentage concentration of 50%, fluoroethane with the mass percentage concentration of 20% and 3,3, 3-trifluoropropene with the mass percentage concentration of 30% are physically mixed at normal temperature to obtain the mixed working medium applicable to the transcritical power cycle.

Example 9: carbon dioxide with the mass percentage concentration of 30%, fluoroethane with the mass percentage concentration of 60% and 3,3, 3-trifluoropropene with the mass percentage concentration of 10% are physically mixed at normal temperature to obtain the mixed working medium applicable to the transcritical power cycle.

Table 1: global warming potential GWP comparison of various embodiments of the present invention

When the ternary mixed working medium provided by the invention is applied to transcritical cycle operation, a typical medium-high temperature heat source (internal combustion engine exhaust waste heat and industrial waste heat) is taken as a design working condition: the inlet pressure of the expansion machine is 12MPa, the inlet temperature is 200 ℃, the isentropic efficiency of the expansion machine is 0.7, the isentropic efficiency of the working medium pump is 0.8, the inlet of the working medium pump is in a saturated liquid state, and the temperature is 25 ℃.

The cycle thermal efficiencies of some examples are shown in Table 2 based on the cycle performance calculations. Pure CO under the same working condition₂The cycle thermal efficiency is only 7.15%, and the embodiments of the invention compare with pure CO₂The cycle thermal efficiency is relatively improved by 12 to 36 percent. Therefore, it can be known from the above embodiment and the related calculation data that the ternary mixed working medium provided by the invention satisfies the global warming potential GWP<150 and safety requirements, excellent cycle performance.

Table 2: comparison of global warming potential GWP and cycle thermal efficiency in some embodiments of the invention

The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.