CN103013450B - Organic Rankine cycle mixed working medium containing toluene - Google Patents
Organic Rankine cycle mixed working medium containing toluene Download PDFInfo
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- CN103013450B CN103013450B CN201210529066.0A CN201210529066A CN103013450B CN 103013450 B CN103013450 B CN 103013450B CN 201210529066 A CN201210529066 A CN 201210529066A CN 103013450 B CN103013450 B CN 103013450B
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- working medium
- temperature
- toluene
- organic rankine
- fluoroethane
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Abstract
The invention discloses an organic Rankine cycle mixed working medium containing toluene, which is applied to an engine waste heat system. The working medium is a two-component mixture composed of toluene and dichloro-fluoroethane in different mass percentages, and is suitable for being used as a working medium of a high-temperature ORC system in which the temperature of a heat source is 400 DEG C to 700 DEG C. The preparation method is as follows: performing physical mixing on the components according to designated matching at normal temperature, so as to obtain the corresponding mixed working medium. The ODP of the working medium is almost zero and the GWP is lower. The working medium has a good environmental property, conforms to the requirements for protecting the ozone layer and reducing the greenhouse effect, and can be directly applied to the high-temperature exhaust waste heat ORC system of an engine.
Description
Technical field
The invention belongs to thermal cycle working medium, be specifically related to a kind of as the cycle fluid in exhaust heat of internal combustion engine recovery system.
Background technology
Engine back pressure is lower, temperature is higher, and the energy of its direct expansion acting utilizes effect poor, and therefore the application of absorption refrigeration is restricted.Adopting at present organic Rankine circulation (ORC) to reclaim afterheat of IC engine becomes study hotspot, adopts organic Rankine to loop waste heat recovery, and the selection of working medium will become key.For interchanger, it is available can loss be mainly temperature difference heat exchange, i.e. working medium side temperature and mean temperature difference hot, low-temperature receiver.For subcritical saturated circulation, pure working medium is isothermal evaporation, and mixing medium meeting occurrence temperature slippage in the time of phase transformation, the thermal source of can better fitting, and then reduce heat transfer temperature difference, its available energy loss is also just little.For the UTILIZATION OF VESIDUAL HEAT IN of engine, because exhaust temperature is high, in its heat transfer process, temperature drop gradient is larger, and so pure matter isothermal evaporation process heat transfer temperature difference is also just larger; Mixing medium can better mate and follow with large temperature gradient thermal source, aspect minimizing irreversible loss, has larger potentiality.Especially the characteristic of mixing medium can be by the difference along with constituent element or proportioning, better with interchanger cold and hot fluid between the mating of the temperature difference, improve system efficiency.
Mixing medium provided by the invention, develops as the system of 400 ~ 700 DEG C of high-temperature exhaust air UTILIZATION OF VESIDUAL HEAT IN, also can be used as the thermal cycle working medium of high-temperature geothermal, biomass energy.
Summary of the invention
The object of the invention is, a kind of mixed working fluid for organic rankine cycle that contains toluene that is suitable for engine exhaust heat system applies is provided, also can be used as the thermal cycle working medium of high-temperature geothermal, biomass energy.
The mixed working fluid for organic rankine cycle that contains toluene that the present invention proposes has comprised two kinds of constituent element materials, toluene (C altogether
7h
8) and dichloro one fluoroethane (R141b).
The basic parameter of each constituent element material is as shown in table 1.
Content introduction of the present invention and embodiment: the mixed working fluid for organic rankine cycle that contains toluene, formed by toluene and dichloro one fluoroethane, the mass percent proportioning of two kinds of constituent elements is: toluene/dichloro one fluoroethane: 80/20; Or toluene/dichloro one fluoroethane: 60/40; Or toluene/dichloro one fluoroethane: 40/60; Or toluene/dichloro one fluoroethane: 20/80.
Each constituent element material mass percentage ratio sum of every kind of mixing medium is 100% above.
The preparation method of above-mentioned mixing medium is that each constituent element material is carried out to physical mixed at normal temperatures by the quality proportioning of its appointment.
The present invention has the following advantages and beneficial effect:
(1) environmental performance: in mixing medium of the present invention, the ODP of R141b is lower close to zero, GWP.Visible its environmental characteristics is good, meets Ozonosphere protection, reduces the requirement of Greenhouse effect.
(2) thermal parameter (as table 2): when exhaust temperature is 792.15K, the evaporating pressure of A working medium under subcritical saturated state of cyclic operation (as vaporization temperature 520K, condensing temperature 308K) in about 2.36MPa, condensing pressure is in 0.029MPa left and right.The pure working medium of contrast toluene, the thermal parameter under identical operating mode is: evaporating pressure is that 1.59Mpa, condensing pressure are 0.006Mpa.Visible, under high temperature design conditions, the condensing pressure of pure working medium toluene is too low, is difficult to application in actual procedure, be a challenge, and mixing medium can improve this phenomenon to the design of condenser.
(3) cycle performance: the present invention is under above-mentioned design conditions, and A working medium circulation thermo-efficiency is 25.33%,
most effectively reach 56.11%, and
loss only has 23.68kw, and cycle performance is good.
The basic parameter of the contained constituent element of table 1 mixing medium
T
b: normal boiling point, T
c: critical temperature, P
c: emergent pressure
The mixing medium physical parameter of four kinds of different mass percentage ratio proportionings of table 2
Embodiment
Embodiment 1: get 80
mass%(C
7h
8) and 20
mass%R141b, carries out after physical mixed at normal temperatures as cycle fluid.
Embodiment 2: get 60
mass%(C
7h
8) and 40
mass%R141b, carries out after physical mixed at normal temperatures as cycle fluid.
Embodiment 3: get 40
mass%(C
7h
8) and 60
mass%R141b, carries out after physical mixed at normal temperatures as cycle fluid.
Embodiment 4: get 20
mass%(C
7h
8) and 80
mass%R141b, carries out after physical mixed at normal temperatures as cycle fluid.
The design conditions of engine waste heat utilization system are taken as: vaporization temperature is 470K, and condensing temperature is 308K, and decompressor heat insulating ability is 0.7, and topping-up pump efficiency is 0.8.According to cycle calculations, the relevant parameters of above-mentioned 4 embodiment and cycle performance index are as shown in table 3.
Table 3 embodiment performance
This mixing medium can be directly applied to oil engine high-temperature exhaust air waste heat ORC system, not need to add heat conduction wet goods secondary heat exchange system (current high-temperature exhaust air waste heat recovery generally adopts), and can ensure to circulate efficiency and unit main hardware matching degree.
Claims (1)
1. contain the mixed working fluid for organic rankine cycle of toluene, it is characterized in that described mixing medium is made up of toluene and dichloro one fluoroethane, the mass percent proportioning of two kinds of constituent elements is: toluene/dichloro one fluoroethane: 80/20; Or toluene/dichloro one fluoroethane: 60/40; Or toluene/dichloro one fluoroethane: 40/60; Or toluene/dichloro one fluoroethane: 20/80.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210529066.0A CN103013450B (en) | 2012-12-10 | 2012-12-10 | Organic Rankine cycle mixed working medium containing toluene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210529066.0A CN103013450B (en) | 2012-12-10 | 2012-12-10 | Organic Rankine cycle mixed working medium containing toluene |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103013450A CN103013450A (en) | 2013-04-03 |
| CN103013450B true CN103013450B (en) | 2014-12-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210529066.0A Expired - Fee Related CN103013450B (en) | 2012-12-10 | 2012-12-10 | Organic Rankine cycle mixed working medium containing toluene |
Country Status (1)
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|---|---|
| CN (1) | CN103013450B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103374332A (en) * | 2013-07-04 | 2013-10-30 | 天津大学 | Organic rankine cycle mixing working medium with cyclopentane |
| CN103615310B (en) * | 2013-12-09 | 2016-01-20 | 天津大学 | Internal-combustion engine cool cycles and exhaust energy reclaim integrated apparatus and the controlling method of ORC |
| CN109609103B (en) | 2018-12-30 | 2020-05-19 | 天津大学 | Three-component mixed working medium suitable for waste heat recovery power circulation of internal combustion engine |
-
2012
- 2012-12-10 CN CN201210529066.0A patent/CN103013450B/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| Huijuan Chen.《The Conversion of Low-Grade Heat into Power Using Supercritical Rankine Cycles》.《Scholar Commons University of South Florida：Graduate School Theses and Dissertations》.2010, * |
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|---|---|
| CN103013450A (en) | 2013-04-03 |
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