CN103013450A - Organic Rankine cycle mixed working medium containing toluene - Google Patents
Organic Rankine cycle mixed working medium containing toluene Download PDFInfo
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- CN103013450A CN103013450A CN2012105290660A CN201210529066A CN103013450A CN 103013450 A CN103013450 A CN 103013450A CN 2012105290660 A CN2012105290660 A CN 2012105290660A CN 201210529066 A CN201210529066 A CN 201210529066A CN 103013450 A CN103013450 A CN 103013450A
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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 the 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 relatively poor, so 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 loss mainly to be 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 when 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, the temperature drop gradient is larger in its heat transfer process, 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, has larger potentiality aspect the minimizing irreversible loss.Especially the characteristic of mixing medium can will be along with the difference of constituent element or proportioning, and the coupling of the temperature difference improves system efficiency better and between the interchanger cold and hot fluid.
Mixing medium provided by the invention is developed as the system of 400 ~ 700 ℃ 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 objective of the invention is, a kind of mixed working fluid for organic rankine cycle that contains toluene that is suitable for the 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: contain the mixed working fluid for organic rankine cycle of toluene, be comprised of toluene and dichloro one fluoroethane, the mass percent proportioning of two kinds of constituent elements is: toluene/dichloro one fluoroethane: 80/20; Perhaps toluene/dichloro one fluoroethane: 60/40; Perhaps toluene/dichloro one fluoroethane: 40/60; Perhaps toluene/dichloro one fluoroethane: 20/80.
More than each constituent element material mass percentage ratio sum of every kind of mixing medium be 100%.
The preparation method of above-mentioned mixing medium is each constituent element material to be carried out physical mixed at normal temperatures by the quality proportioning of its appointment get final product.
The present invention has the following advantages and beneficial effect:
(1) environmental performance: the ODP of R141b is close to zero in the mixing medium of the present invention, and GWP is lower.As seen its environmental characteristics is good, meets Ozonosphere protection, reduces the requirement of Greenhouse effect.
(2) thermal parameter (such as table 2): when exhaust temperature is 792.15K, the evaporating pressure of A working medium under subcritical saturated state of cyclic operation (such as vaporization temperature 520K, condensing temperature 308K) about 2.36MPa, condensing pressure is about 0.029MPa.The pure working medium of contrast toluene, the thermal parameter under the identical operating mode is: evaporating pressure is that 1.59Mpa, condensing pressure are 0.006Mpa.As seen, under the high temperature design conditions, the condensing pressure of pure working medium toluene is excessively low, in actual procedure, be difficult to use, and be a challenge to the design of condenser, and mixing medium can improve this phenomenon.
(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 of table 2 proportioning
Embodiment
Embodiment 1: get 80
Mass%(C
7H
8) and 20
Mass%R141b carries out after the physical mixed at normal temperatures as cycle fluid.
Embodiment 2: get 60
Mass%(C
7H
8) and 40
Mass%R141b carries out after the physical mixed at normal temperatures as cycle fluid.
Embodiment 3: get 40
Mass%(C
7H
8) and 60
Mass%R141b carries out after the physical mixed at normal temperatures as cycle fluid.
Embodiment 4: get 20
Mass%(C
7H
8) and 80
Mass%R141b carries out after the 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 the decompressor heat insulating ability is 0.7, and topping-up pump efficient 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 is generally adopted), and can guarantee to circulate efficiency and unit main hardware matching degree.
Claims (1)
1. the mixed working fluid for organic rankine cycle that contains toluene is characterized in that described mixing medium is comprised of toluene and dichloro one fluoroethane, and the mass percent proportioning of two kinds of constituent elements is: toluene/dichloro one fluoroethane: 80/20; Perhaps toluene/dichloro one fluoroethane: 60/40; Perhaps toluene/dichloro one fluoroethane: 40/60; Perhaps 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 true CN103013450A (en) | 2013-04-03 |
| CN103013450B 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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Cited By (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 |
| CN103615310A (en) * | 2013-12-09 | 2014-03-05 | 天津大学 | Recombination device for internal combustion engine cooling cycle and exhaust energy recovery ORC and control method |
| CN109609103A (en) * | 2018-12-30 | 2019-04-12 | 天津大学 | A kind of three constituent element mixed working fluids suitable for afterheat of IC engine recycling power cycle |
-
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》 * |
Cited By (7)
| 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 |
| CN103615310A (en) * | 2013-12-09 | 2014-03-05 | 天津大学 | Recombination device for internal combustion engine cooling cycle and exhaust energy recovery ORC and control method |
| 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 |
| CN109609103A (en) * | 2018-12-30 | 2019-04-12 | 天津大学 | A kind of three constituent element mixed working fluids suitable for afterheat of IC engine recycling power cycle |
| 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 |
| WO2020140320A1 (en) * | 2018-12-30 | 2020-07-09 | 天津大学 | Tri-component mixing working medium suitable for waste heat recovery power cycle in internal combustion engine |
| US11299660B2 (en) | 2018-12-30 | 2022-04-12 | Tianjin University | Three-component mixed working fluid for internal combustion engine waste heat recovery power cycle |
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| Publication number | Publication date |
|---|---|
| CN103013450B (en) | 2014-12-10 |
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Granted publication date: 20141210 Termination date: 20211210 |