CN102660229A - Incombustible mixed refrigerant suitable for copious cooling temperature of 90-140DEG C below zero - Google Patents
Incombustible mixed refrigerant suitable for copious cooling temperature of 90-140DEG C below zero Download PDFInfo
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Abstract
The invention relates to an incombustible mixed refrigerant suitable for the copious cooling temperature of 90-140DEG C below zero, which comprises the following five groups of substances: the first group is nitrogen, argon, methane or mixture; the second group is R14; the third group is R23, R116, R170, R1150, R41 or mixture; the fourth group is R218, R125, R32, R143a, R290, R1270, R13I1, R134, R134a, R152a, R1216 or mixture; the fifth group is R1234ze, R245cb, R227ea, R3110, R236fa, R254cb, R143, R236ea, R245fa, R329mcc, R347mcc, R338mcf, R245eb, R245ca, R338mee, R338mcc or mixture; the molar concentrations of the five groups are respectively 5-35%, 10-40%, 5-20%, 5-20% and 5-25%. The incombustible mixed refrigerant suitable for the copious cooling temperature of 90-140DEG C below zero has the advantages of low integral greenhouse effect, no ozone damage and the like, is safe in a regeneration type throttling and refrigerating system, and refrigeration in the temperature zone of 90-140DEG C below zero can be realized.
Description
Technical field
The present invention relates to freeze with the low temperature technique field in refrigeration agent, particularly a kind of not flammable mix refrigerant that is suitable for-90～-140 ℃ of cryogenic temperatures, this polynary mix refrigerant is efficient, safety and environmental protection.
Background technology
Utilize the deep cooling polybasic mixture throttling refrigerating machine of backheat measure to have efficiently, reliably reach advantages such as low cost of manufacture; Be widely used in the energy, chemical industry and cryogenic engineering field; Be used to realize the aspects such as liquefaction of device depth cooling and industrial gasses, for example field such as cryogenic refrigerator, natural gas liquefaction.Except that hardware facilities such as refrigeration system flow process and compressor and interchanger, what this Refrigeration Technique was the most key is polynary mix refrigerant.Be applied to requirement and the system structure design of the polynary mix refrigerant of mixed work medium for throttling refrigeration system according to the refrigeration warm area; Usually require 3～7 kinds of constituent elements to constitute; Show as typical non-azeotropic characteristic; And utilize the temperature variant nonlinear characteristic of enthalpy between its phase change zone, realize the thermal equivalent coupling between the high-low pressure refrigeration agent, thereby improve refrigerating efficiency.Set forth from the another one angle; Each constituent element has higher isothermal throttling effect in its temperature range that undergoes phase transition; And each constituent element with different boiling temperature just matees relay according to boiling point, can constitute mix refrigerant and have higher refrigeration effect in the whole refrigeration temperature scope of striding.Screening can be repeated no more referring to relevant academic documents with the thermodynamic optimization principle here about refrigeration agent.
Owing to receive the basic physical parameter restriction of the boiling point, freezing point temperature etc. of constituent element, also have other physicochemical property such as combustibility, toxicity of constituent element working medium in addition, the optional constituent element under the effective constituent element of mixing medium, the especially low temperature is very limited.At present by some mandates or apply for a patent and relate to the deep cooling mixing medium and form and concentration proportioning; Wherein granted patent ZL 97115295.0; ZL 03121423.1; 03121466.5 fen warm area of ZL 03121467.3 and ZL has proposed to be used for the serial multicomponent mixture work medium of copious cooling throttle Refrigeration Technique, and wherein constituent element has the fluorochemical of nitrogen, alkane and part alkane to constitute mixture ozone free damage effect.Each constituent element of mixture is divided into cold zone constituent element, the normal warm area constituent element that freezes according to boiling point difference, middle high-temperature zone constituent element and high-temperature zone constituent element, and each warm area constituent element has higher thermodynamic(al) efficiency according to the multicomponent mixture work medium of a concentration ratio acquiring demand.Alkanes substances such as the methane that wherein contains, ethane and propane have the mutual solubility good with lubricating oil, and Greenhouse effect are little, and environmental protection characteristic is good, but it is certain flammable to cause system to exist.And because the existence of combustiblecomponents, the system that makes all need consider measures such as explosion-proof in links such as production, debugging, maintenance and use occasions, has increased the difficulty that production cost and user accept.
ZL 01802606.0 (publication number: CN 1388887A is arranged; Similar with it content appears in the middle of the US6502410 patent) hydrofluoride (HFCs) and perfluoro-compound (FC) with nitrogen (N2), argon gas (Ar) and alkane proposed; The not flammable polynary mix refrigerant formed such as R23, R125, R134a, R236fa and R245fa for example; Wherein minimum temperature can realize 105K, also contains neon (Ne), helium compositions such as (He).This patent is different according to the refrigeration warm area equally, is divided into different zones for the constituent element in the mixture according to its boiling point, constitutes whole mixt by each warm area different boiling constituent element according to the finite concentration proportional range.Its whole mixture does not contain combustible alkanes composition, and also not hydrogeneous fluorochlorohydrocarbon (HCFC) class has the component of ozone layer destroying.It is poor that but its efficient contains the mixture of alkane.Wherein avoid flammable in order to adopt, not flammable HFC class material that it is chosen such as high boiling point constituent elements such as HFC125, HFC236fa all have the latent value (GWP) of higher Greenhouse effect.
Other has U.S. Pat 5408848 to propose the mixing medium Refrigeration Technique that a kind of employing does not contain the CFC constituent element; Minimum refrigeration demand more than-150 ℃ to satisfy, wherein having provided in an embodiment with R142b, R134a, R23, R14 and Ar is master's mixing medium composition.This mixture does not contain combustibleconstituents in forming, but wherein containing R142b is the HCFC material, has the depletion of the ozone layer effect, belongs to the row of restriction and forbidding.
When adopting the mixed work medium for throttling Refrigeration Technique to realize the situation of deep refrigerating; According to deep cooling mixing medium Refrigeration Technique principle, the boiling point of the required constituent element of multicomponent mixture work medium that it adopts should be according to the refrigeration warm area, and (the concrete elaboration seen Cryogenics to be increased to envrionment temperature gradually by minimum temperature (should be lower than or equal at least lowest refrigerating temperature) beginning; Volume 44; Issue 12, and December 2004, Pages 847-857).Therefore realize cryogenic refrigeration, in the time of for example-140 ℃, the constituent element that must have boiling point to be lower than-140 ℃ in the mixture exists, for example Ar or N2.Because the lower boiling constituent element limited amount that nature exists, non-flammable material generally by materials such as He, Ne, N2, Ar, has only R14 etc. in the middle of the synthetic material in the natural medium.To realize cryogenic refrigeration in addition, except that the boiling point of material is suitable, also need freezing point temperature enough low, stop up fluid channel, especially throttle capillary tube to avoid separating out solid at low temperatures.Therefore when realizing cryogenic refrigeration, in the constituent element of minimum warm area, materials such as He, Ne, N2, Ar and R14 are essential according to the refrigeration warm area that will realize basically, especially materials such as N2, Ar, R14 and R23.This also can find out from patent ZL 01802606.0 and US5408848; These two patents have all comprised materials such as N2, Ar, R14 and R23; But also contain different the composition in the mixture of its composition; For example US5408848 has R142b, and ZL 01802606.0 contains materials such as R125, R245fa and R236fa.
As everyone knows; For a kind of mixture of forming by multiple material; Its hot rerum natura is confirmed by mixture constituent element and constituent element concentration; Wherein but the identical concentration of different or constituent elements of constituent element is different, all can constitute diverse mixture, and this hot rerum natura such as equivalent weight, critical parameter, enthalpy entropy that show mixture is all variant.Constituent element is identical and concentration difference shows more in general cold mixt refrigeration agent; The zeotrope of for example forming by R32, R125 and three kinds of materials of R134a; Can be divided into different refrigerants owing to form the difference of concentration; Its application scenario also is not quite similar, and mixture and the business-like numbering be made up of above-mentioned three kinds of materials at present can specifically be divided into refrigeration agents such as R407A～R407E, and it has diverse rerum natura and alternative object.These are set forth to analyze and just are problem of explanation, and promptly different concns can form diverse mixture by comprising part same components even identical constituent element, and it specifically can be confirmed by corresponding target.
According to above-mentioned analysis; Realized comprising the polynary not flammable mix refrigerant of forming by N2, Ar, R14, R23 and other high boiling substances etc. of deep cooling in the middle of can knowing prior art; But in the middle of this type of mix refrigerant in the high boiling point constituent element or adopted R142b etc. to contain the dive material of value (ODP) of ozone layer destroying; Adopted R236fa etc. to have the hydrogen fluorohydrocarbon material of high-temperature chamber effect (GWP), these all make its environmental protection characteristic be affected.In addition; The mutual solubility of most HFC and FC class material and lubricating oil is poor; The freezing point temperature of HFC and FC class material that has higher in addition is all higher; And the molten oiliness of the low temperature of its mix refrigerant is relatively poor, and therefore above-mentioned not flammable mix refrigerant generally is applied in the middle of the multistage automatic cascade refrigeration system.In the middle of the system that is adopted, multistage vapor-liquid separating device is set usually, lubricating oil and constituent element with high-solidification point temperature are distinguished from coming out in higher temperatures, to guarantee system's works better, this has obviously increased the complicacy of system.
In addition, discover: 1. some non-flammable high boiling point working medium have certain dissolving power in the low boiling working fluid that can supply select for use, through component control and working medium to selection can effectively avoid the high boiling point component at low temperatures solidify obstructing problem; 2. both just contained comhustible component in the multicomponent mixture, as long as choose other component and control the concentration of comhustible component, can to make multicomponent mixture equally be non-flammable or be within the safety range.Based on above-mentioned cognition, the present invention proposes efficient, the safety and the polynary mix refrigerant of environmental protection of a kind of being applicable to-90～-140 ℃ cryogenic temperature.
Summary of the invention
The objective of the invention is to: the characteristics such as efficient, safety and environmental protection of taking into account the deep cooling mixing medium; And provide a kind of and be suitable for the not flammable mix refrigerant of-90～-140 ℃ of cryogenic temperatures; This mix refrigerant is efficient, also environmental protection of safety, can be applicable in the back-heating type mixed work medium for throttling refrigeration system to realize the refrigeration of-90～-140 ℃ of warm areas.
Technical scheme of the present invention is following:
The not flammable mix refrigerant of provided by the invention being suitable for-90～-140 ℃ cryogenic temperature, it is made up of following five groups of materials, and these five groups of materials are respectively:
First group of material is nitrogen (N
2), argon (Ar), methane (CH
4) or the mixture of any two materials compositions wherein or the mixtures of three kinds of material compositions;
Second group of material is tetrafluoromethane (CF
4, R14);
The 3rd group of material is trifluoromethane (CHF
3, R23), hexafluoroethane (CF
3CF
3, R116), ethane (C
2H
6, R170), ethene (C
2H
4, R1150), a fluoromethane (CH
3F, the mixture that mixture that any two materials R41) or are wherein formed or multiple material are wherein formed;
The 4th group of material is UN 2424 (C
3F
8, R218), pentafluoride ethane (CHF
2CF
3, R125), methylene fluoride (CH
2F
2, R32), HFC-143a (CH
3CF
3, R143a), propane (C
3H
8, R290), propylene (C
3H
6, R1270), CF3I (CF
3I, R13I1), 1,1,2,2-Tetrafluoroethane (CHF
2CHF
2, R134), 1,1,1,2-Tetrafluoroethane (CH
2FCF
3, R134a), 1,1-C2H4F2 C2H4F2 (CH
3CHF
2, R152a), R 1216 (CF2=CFCF3, the mixture that mixture that any two materials R1216) or are wherein formed or multiple material are wherein formed;
The 5th group of material is 1,3,3,3-tetrafluoeopropene (CF
3CH=CHF, R1234ze), 1,1,1,2,2-pentafluoropropane (CH
3CF
2CF
3, R245cb), 1,1,1,2,3,3,3-HFC-227 (CF
3CHFCF
3, R227ea), perfluorinated butane (C
4F
10, R3110), 1,1,1,3,3,3-HFC-236fa (CF
3CH
2CF
3, R236fa), 1,1,2,2-tetrafluoropropane (CH
3CF
2CHF
2, R254cb), HFC-143a (CH
2FCHF
2, R143), 1,1,1,2,3,3-HFC-236fa (CHF
2CHFCF
3, R236ea), 1,1,1,3,3-pentafluoropropane (CHF
2CH
2CF
3, R245fa), 1,1,1,2,2,3,3,4,4-nine fluorine butane (CHF
2CF
2CF
2CF
3, R329mcc), 1,1,1,2,2,3,3-seven fluorine butane (CH
3CF
2CF
2CF
3, R347mcc), 1,1,1,2,2,4,4,4-Octafluorobutane (CF
3CH
2CF
2CF
3, R338mcf), 1,1,1,2,3-pentafluoropropane (CH
2FCHFCF
3, R245eb), 1,1,2,2,3-pentafluoropropane (CH
2FCF
2CHF
2, R245ca), 1,1,1,2,3,4,4,4-Octafluorobutane (CF
3CHFCHFCF
3, R338mee), 1,1,1,2,2,3,3,4-Octafluorobutane (CH
2FCF
2CF
2CF
3, the mixture that mixture that any two materials R338mcc) or are wherein formed or multiple material are wherein formed;
The volumetric molar concentration sum of respectively organizing material in the mixture that said five groups of materials are formed is 100%;
Wherein, the volumetric molar concentration of said first group of material is 5%～35%;
The volumetric molar concentration of said second group of material is 10%～40%;
The volumetric molar concentration of said the 3rd group of material is 10%～30%;
The volumetric molar concentration of said the 4th group of material is 5%～20%;
The volumetric molar concentration of said the 5th group of material is 10%～25%.
The not flammable mix refrigerant of of the present invention being suitable for-90～-140 ℃ cryogenic temperature, when first group of material selected methane for use, volumetric molar concentration≤25% of methane in said mix refrigerant.
The not flammable mix refrigerant of of the present invention being suitable for-90～-140 ℃ cryogenic temperature; When the 3rd group of material selected the mixture of ethane, ethene, a fluoromethane or any two materials compositions wherein or the mixture that three kinds of materials are wherein formed, volumetric molar concentration≤25% of said the 3rd group of material in said mix refrigerant for use.
The not flammable mix refrigerant of of the present invention being suitable for-90～-140 ℃ cryogenic temperature; When the 4th group of material selected methylene fluoride, HFC-143a, propane, propylene, 1 for use; The mixture that mixture that 1-C2H4F2 C2H4F2 or any two materials are wherein formed or multiple material are wherein formed, volumetric molar concentration≤20% of said the 4th group of material in said mix refrigerant.
The not flammable mix refrigerant of of the present invention being suitable for-90～-140 ℃ cryogenic temperature is at the methane of first component; The methylene fluoride of the ethane of the 3rd component, ethene and a fluoromethane and the 4th component, HFC-143a, propane, propylene and 1, in the 1-C2H4F2 C2H4F2, when selecting two kinds of materials or multiple material simultaneously for use, their volumetric molar concentration sum≤25% then.
Above-mentioned mix refrigerant concentration range exists corresponding to working pressure range: high pressure is in 1.6～2.3MPa scope, and low pressure (is absolute pressure) in 02～0.6MPa scope, and normal pressure ratio scope is between 3～10.Wherein the concentration change general trend of constituent element is to increase with low pressure, and lower boiling constituent element concentration increases, and corresponding middle high boiling point constituent element concentration reduces, and vice versa.Adopt the back-heating type mixed work medium for throttling refrigeration system of above-mentioned mix refrigerant to take the one-level vapour liquid separator at higher warm area; Lubricating oil and part high boiling point constituent element are separated to reflux; Guarantee the security of system reliability service; Concrete refrigeration cycle structure can be referring to public technologies such as patent ZL00136709.9, and perhaps other similar cycle structures repeat no more here.
Adopt the regenerative refrigerating system of above-mentioned mix refrigerant can realize-90～-140 ℃ of warm area refrigeration safely, efficiently; Compare with existing deep cooling mix refrigerant; It has complete non-inflammability or only weak flammable; And whole Greenhouse effect are low, and ozone free damage layer effect has significant advantage fully.
Embodiment
Embodiment 1-3
Preparation the present invention run on the not flammable fully of-90 ℃ of warm areas or only a little less than flammable polynary mix refrigerant, the inner minimum heat transfer temperature difference of interchanger is 1K, envrionment temperature is 35 ℃, its polynary mix refrigerant working medium concentration and performance see the following form:
Embodiment 2: preparation run on the not flammable fully of-110 ℃ of warm areas or only a little less than flammable polynary mix refrigerant, the inner minimum heat transfer temperature difference of interchanger is 1K, envrionment temperature is 35 ℃, its polynary mix refrigerant working medium concentration and performance see the following form:
Embodiment 3: preparation run on the not flammable fully of-140 ℃ of warm areas or only a little less than flammable polynary mix refrigerant, the inner minimum heat transfer temperature difference of interchanger is 1K, envrionment temperature is 35 ℃, its polynary mix refrigerant working medium concentration and performance see the following form:
In the foregoing description; Adopted not flammable fully or only a little less than the regenerative refrigerating system of flammable mix refrigerant can realize-90～-140 ℃ of warm areas refrigeration safely, efficiently; Compare with existing deep cooling mix refrigerant, it has complete non-inflammability or only weak flammable, and whole Greenhouse effect are low; Ozone free damage layer effect has significant advantage fully.
Claims (5)
1. not flammable mix refrigerant that is suitable for-90～-140 ℃ of cryogenic temperatures, it is made up of following five groups of materials, and these five groups of materials are respectively:
First group of material is N
2, Ar, methane or any two materials wherein mixture or three kinds of mixtures that material is formed of forming;
Second group of material is tetrafluoromethane;
The 3rd group of material is the mixture of trifluoromethane, hexafluoroethane, ethane, ethene, a fluoromethane or any two materials compositions wherein or the mixture that multiple material is wherein formed;
The 4th group of material is UN 2424, pentafluoride ethane, methylene fluoride, HFC-143a, propane, propylene, CF3I, 1; 1,2,2-Tetrafluoroethane, 1; 1; 1,2-Tetrafluoroethane, 1, the mixture that mixture that 1-C2H4F2 C2H4F2, R 1216 or any two materials are wherein formed or multiple material are wherein formed;
The 5th group of material is 1,3,3,3-tetrafluoeopropene, 1,1,1,2,2-pentafluoropropane, 1,1,1,2,3,3; 3-HFC-227, perfluorinated butane, 1,1,1,3,3,3-HFC-236fa, 1,1,2,2-tetrafluoropropane, HFC-143a, 1,1,1,2,3; 3-HFC-236fa, 1,1,1,3,3-pentafluoropropane, 1,1,1,2,2,3,3,4; 4-nine fluorine butane, 1,1,1,2,2,3,3-seven fluorine butane, 1,1,1,2,2,4; 4,4-Octafluorobutane, 1,1,1,2,3-pentafluoropropane, 1,1,2,2,3-pentafluoropropane, 1,1,1; 2,3,4,4,4-Octafluorobutane, 1,1,1,2,2,3,3, the mixture that mixture that 4-Octafluorobutane or any two materials are wherein formed or multiple material are wherein formed;
The volumetric molar concentration sum of respectively organizing material in the mixture that said five groups of materials are formed is 100%;
Wherein, the volumetric molar concentration of said first group of material is 5%～35%;
The volumetric molar concentration of said second group of material is 10%～40%;
The volumetric molar concentration of said the 3rd group of material is 10%～30%;
The volumetric molar concentration of said the 4th group of material is 5%～20%;
The volumetric molar concentration of said the 5th group of material is 10%～25%.
2. be suitable for the not flammable mix refrigerant of-90～-140 ℃ of cryogenic temperatures by claim 1 is described, it is characterized in that: select methane for use in said first group of material, volumetric molar concentration≤25% of methane in said mix refrigerant.
3. be suitable for the not flammable mix refrigerant of-90～-140 ℃ of cryogenic temperatures by claim 1 is described; It is characterized in that: said the 3rd group of material selected the mixture of ethane, ethene, a fluoromethane or any two materials compositions wherein or the mixture that three kinds of materials are wherein formed, volumetric molar concentration≤25% of said the 3rd group of material in said mix refrigerant for use.
4. be suitable for the not flammable mix refrigerant of-90～-140 ℃ of cryogenic temperatures by claim 1 is described; It is characterized in that: said the 4th group of material selected methylene fluoride, HFC-143a, propane, propylene, 1 for use; The mixture that mixture that 1-C2H4F2 C2H4F2 or any two materials are wherein formed or multiple material are wherein formed, volumetric molar concentration≤20% of said the 4th group of material in said mix refrigerant.
5. be suitable for the not flammable mix refrigerant of-90～-140 ℃ of cryogenic temperatures by claim 1 is described, it is characterized in that: at the methane of first component; The methylene fluoride of the ethane of the 3rd component, ethene and a fluoromethane and the 4th component, HFC-143a, propane, propylene and 1, in the 1-C2H4F2 C2H4F2, when selecting two kinds of materials or multiple material simultaneously for use, their volumetric molar concentration sum≤25% then.
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