CN102777240A - Diesel engine exhaust gas waste heat recovery system of two-stage Rankine cycle - Google Patents

Diesel engine exhaust gas waste heat recovery system of two-stage Rankine cycle Download PDF

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Publication number
CN102777240A
CN102777240A CN2012102895905A CN201210289590A CN102777240A CN 102777240 A CN102777240 A CN 102777240A CN 2012102895905 A CN2012102895905 A CN 2012102895905A CN 201210289590 A CN201210289590 A CN 201210289590A CN 102777240 A CN102777240 A CN 102777240A
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China
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working medium
rankine cycle
temperature
steam turbine
vaporizer
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CN2012102895905A
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Chinese (zh)
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舒歌群
刘丽娜
梁友才
赵建
田华
于国鹏
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Tianjin University
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Tianjin University
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Priority to CN2012102895905A priority Critical patent/CN102777240A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

Abstract

The invention discloses a diesel engine exhaust gas waste heat recovery system of a two-stage Rankine cycle. The technical scheme of the invention is that a first stage of Rankine cycle system is composed of a first evaporator, a first steam turbine, a high temperature preheater high temperature side, a first condenser as well as a first working medium pump which are sequentially connected; a second stage of Rankine cycle system is composed of a second evaporator, a second steam turbine, a second condenser, a second working medium pump, a low temperature preheater as well as a low temperature side of the high temperature preheater which are sequentially connected; the two stages of Rankine cycle systems are connected through the high temperature preheater; an engine exhaust pipe is sequentially connected with the gas sides of the first and second evaporators, and cooling water in an engine is connected with a working medium side in the low temperature preheater, so that a built-in cooling water closed cycle heat exchange is formed; and the steam turbines in the two stages are respectively connected with a generator. Steam and two stages of organic Rankine cycle recover exhaust waste heat, the high temperature exhaust waste heat of the engine is fully utilized, and the purposes of energy saving and high-efficiency thermodynamic cycle of the system are achieved.

Description

The diesel exhaust gas residual neat recovering system of two-stage Rankine cycle
Technical field
The invention belongs to the combustion engine energy-saving emission-reduction technology, be specifically related to a kind of secondary organic rankine cycle system that is used for the heat recovery of diesel engine high-temperature exhaust air.
Background technique
Increasingly serious along with energy worsening shortages and environmental problem, the energy-saving and emission-reduction of internal-combustion engine receive common people's concern.Utilizing organic Rankine circulation (ORC) technology for recovery diesel residual heat is present research focus, and its thermal efficiency and Security are higher, and be simple in structure.The technology of Rankine cycle recovery waste heat concentrates on the single-stage circulation mostly at present.Through discovering, reclaim middle-low temperature heat and adopt its efficient of single-stage ORC to be superior to traditional steam Rankine cycle.But adopting the condition of ORC is that the working medium temperature generally is not higher than 350 ℃, and engine exhaust temperature is generally up to 500~600 ℃.So high temperature possibly cause organic working medium to decompose, and this is the major defect that restriction ORC recycles at high-temperature residual heat.Be head it off, Italian Parma university adopts the conduction oil circulation between exhaust and working medium, and this scheme has been carried out simulation analysis, and display efficiency can improve 12% as a result., the conduction oil circulation reduces the heat of recovery but can reducing the grade of thermal source.Single-stage ORC is also insufficient to the UTILIZATION OF VESIDUAL HEAT IN of exhaust in addition, and engine exhaust still has higher relatively temperature through after the heat exchange, and the weary gas after working medium expands also has higher temperature and comprises that cooling water also has certain waste heat.
Therefore, to above-mentioned present situation, if can the high-temperature residual heat of engine exhaust fully be recycled, then the raising to the internal-combustion engine energy-conserving and emission-cutting technology is significant.
Summary of the invention
The objective of the invention is, propose a kind of diesel exhaust gas residual neat recovering system that adopts the two-stage Rankine cycle, ladder reclaims the exhaust heat of motor, and the engine high-temperature exhaust air waste heat is fully used.
Below in conjunction with accompanying drawing principle of the present invention and system's composition are described.The diesel exhaust gas residual neat recovering system of two-stage Rankine cycle comprises vaporizer, steam turbine, generator, condenser, working medium pump, high-temperature preheater, low-temperature pre-heater and motor etc.The technological scheme that system adopted is: connect to form first order Rankine cycle system successively by the first vaporizer working medium side, first steam turbine, high-temperature preheater high temperature refrigerant side, the first condenser working medium side and first working medium pump; Cryogenic fluid side by the second vaporizer working medium side, second steam turbine, the second condenser working medium side, second working medium pump, low-temperature pre-heater working medium side and high-temperature preheater connects to form second level Rankine cycle system successively.Through high-temperature preheater first and second grade Rankine cycle system is connected.Engine exhaust pipe is connected to the gas side of first vaporizer and second vaporizer successively, and cooling water is connected the interior cooling water closed circulation heat exchange of formation machine with working medium side in the low-temperature pre-heater in the motor machine.First steam turbine is connected with first generator shaft; Second steam turbine is connected with second generator shaft.
System principle is: first order Rankine cycle is the steam Rankine cycle, and the working medium that adopts is water.The thermal source of first order Rankine cycle is the high-temperature residual heat of engine exhaust, utilizes steam circulation to drive engine power generation.The thermal source of second level Rankine cycle mainly is through the engine exhaust high temperature after (with first vaporizer) heat exchange; High-temp waste gas through with the first vaporizer heat exchange after; Its temperature has been reduced to below 350 ℃; So can adopt the organic Rankine circulation of high temperature heat source in being suitable for, realize making full use of of diesel exhaust gas waste heat thus, reach energy-conservation and the purpose system high efficiency thermodynamic cycle.
Characteristics of the present invention and beneficial effect be, utilizes the circulation of steam Rankine cycle and organic Rankine, makes the engine high-temperature exhaust air waste heat obtain the fullest utilization.Through the exhaust heat of two-stage Rankine cycle ladder recovery motor, can remove the restriction of ORC technology in the diesel exhaust gas heat recovery, reach energy-conservation and the purpose system high efficiency thermodynamic cycle.
Description of drawings
Shown in accompanying drawing be that inventive principle and system form structural drawing.Thick line among the figure is represented exhaust pathway.
Embodiment
Below in conjunction with accompanying drawing and through embodiment principle of the present invention and system are done further explanation.Need to prove that present embodiment is narrative, but not be determinate, do not limit protection scope of the present invention with this.
The diesel exhaust gas residual neat recovering system of two-stage Rankine cycle; Comprise vaporizer, steam turbine, generator, condenser, working medium pump, high-temperature preheater, low-temperature pre-heater and motor, its set of systems becomes: high temperature refrigerant side, first condenser, 4 working medium side and first working medium pump 5 by first vaporizer, 1 working medium side, first steam turbine 2, high-temperature preheater 3 connect to form first order Rankine cycle system successively; Cryogenic fluid side by second vaporizer, 7 working medium side, second steam turbine 8, second condenser, 9 working medium side, second working medium pump 10, low-temperature pre-heater 11 working medium side and high-temperature preheater 3 connects to form second level Rankine cycle system successively.First steam turbine is connected with 6 in first generator; Second steam turbine is connected with 12 in second generator.Through high-temperature preheater 3 first and second grade Rankine cycle system is connected, motor 13 outlet pipes are connected to the gas side of first vaporizer and second vaporizer successively.Cooling water is connected the interior cooling water closed circulation heat exchange of formation machine with working medium side in the low-temperature pre-heater in the motor machine.
Working medium described in the first order Rankine cycle is water.Working medium described in the Rankine cycle of the second level is R123, or R134a.
Its systemic circulation is: the high-temperature exhaust air of motor comes out to get into first vaporizer from outlet pipe; Carry out heat exchange with water in this vaporizer; Make its evaporation become the high temperature and high pressure gas of saturated (or overheated), get into the acting of first steam turbine, drive first generator for electricity generation.The weary gas that first steam turbine is discharged gets into high-temperature preheater, and organic working medium is carried out (heating) heat exchange in the Rankine cycle of the first second level, gets into first condenser then and external cooling water heat exchange becomes liquid.Liquid water gets into first vaporizer through first working medium pump, proceeds the next one (steam) Rankine cycle.The waste gas of higher temperature of still having of discharging from first vaporizer gets into second vaporizer, carries out heat exchange with the organic working medium in this vaporizer, and the low temperature waste gas after the heat exchange enters in the surrounding environment.
Working medium is carried out the preheating first time with low-temperature pre-heater (with recirculated cooling water in the motor) earlier through second working medium pump in the Lang Ken circulatory system of the second level; High-temperature preheater (coagulating gas with first steam turbine) carries out the preheating second time then; The organic circulation working medium of process secondary pre-heating temperature elevation gets into second vaporizer (with the inferior high-temperature engine exhaust of the first vaporizer fume side) and carries out heat exchange; Make it become the high temperature and high pressure gas of saturated (or overheated); Get into the acting of second steam turbine, drive second level generator for electricity generation.The weary gas that second steam turbine is discharged gets into second condenser, is liquid by external water quench.Liquid then organic working medium gets into low-temperature pre-heater once more through second working medium pump, proceeds next organic Rankine circulation.As embodiment, the working medium that is adopted in the Rankine cycle of the second level is R123.

Claims (3)

1. the diesel exhaust gas residual neat recovering system of two-stage Rankine cycle; Comprise vaporizer, steam turbine, generator, condenser, working medium pump, high-temperature preheater, low-temperature pre-heater and motor, it is characterized in that: connect to form first order Rankine cycle system successively by first vaporizer (1) working medium side, first steam turbine (2), high-temperature preheater (3) high temperature refrigerant side, first condenser (4) working medium side and first working medium pump (5); First steam turbine is connected with first generator (6) axle; Cryogenic fluid side by second vaporizer (7) working medium side, second steam turbine (8), second condenser (9) working medium side, second working medium pump (10), low-temperature pre-heater (11) working medium side and high-temperature preheater (3) connects to form second level Rankine cycle system successively; Second steam turbine is connected with second generator (12) axle; Through high-temperature preheater (3) first and second grade Rankine cycle system is connected; Motor (13) outlet pipe is connected to the gas side of first vaporizer and second vaporizer successively; Cooling water is connected the interior cooling water closed circulation heat exchange of formation machine with working medium side in the low-temperature pre-heater in the motor machine.
2. according to the diesel exhaust gas residual neat recovering system of the said two-stage Rankine cycle of claim 1, it is characterized in that the working medium described in the first order Rankine cycle is water.
3. according to the diesel exhaust gas residual neat recovering system of the said two-stage Rankine cycle of claim 1, it is characterized in that the working medium described in the Rankine cycle of the second level is R123, or R134a.
CN2012102895905A 2012-08-14 2012-08-14 Diesel engine exhaust gas waste heat recovery system of two-stage Rankine cycle Pending CN102777240A (en)

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Cited By (11)

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CN104265502A (en) * 2014-07-25 2015-01-07 天津大学 Combined-type diesel engine waste heat energy recycling system
CN104612853A (en) * 2013-11-01 2015-05-13 松下知识产权经营株式会社 Exhaust heat recovery apparatus, heating system, steam boiler, and deodorization system
CN104712432A (en) * 2015-03-13 2015-06-17 中国华电工程(集团)有限公司 Two-stage organic Rankine cycle power generation system utilizing exhaust heat of gas turbine
CN105156162A (en) * 2015-09-24 2015-12-16 青岛华捷汽轮机有限公司 Ultralow-temperature waste heat compound heating recycling system and recycling method
CN105247174A (en) * 2013-05-30 2016-01-13 通用电气公司 System and method of waste heat recovery
CN105604620A (en) * 2016-03-08 2016-05-25 浙江大学常州工业技术研究院 System and method for assisting organic Rankine cycles for refrigerating machine
CN105673099A (en) * 2016-01-29 2016-06-15 东莞东阳光科研发有限公司 Process afterheat classification utilization system and purpose thereof
CN105857155A (en) * 2016-03-30 2016-08-17 时建华 Multi-partition logistics apparatus
CN106246407A (en) * 2016-08-25 2016-12-21 广西大学 A kind of system optimizing engine exhaust heat recovery
US9593597B2 (en) 2013-05-30 2017-03-14 General Electric Company System and method of waste heat recovery
CN109931135A (en) * 2019-03-25 2019-06-25 哈尔滨工程大学 A kind of exhaust heat of internal combustion engine gradient utilization system

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US9587520B2 (en) 2013-05-30 2017-03-07 General Electric Company System and method of waste heat recovery
CN105247174A (en) * 2013-05-30 2016-01-13 通用电气公司 System and method of waste heat recovery
US9593597B2 (en) 2013-05-30 2017-03-14 General Electric Company System and method of waste heat recovery
CN104612853A (en) * 2013-11-01 2015-05-13 松下知识产权经营株式会社 Exhaust heat recovery apparatus, heating system, steam boiler, and deodorization system
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CN105156162A (en) * 2015-09-24 2015-12-16 青岛华捷汽轮机有限公司 Ultralow-temperature waste heat compound heating recycling system and recycling method
CN105673099A (en) * 2016-01-29 2016-06-15 东莞东阳光科研发有限公司 Process afterheat classification utilization system and purpose thereof
CN105604620A (en) * 2016-03-08 2016-05-25 浙江大学常州工业技术研究院 System and method for assisting organic Rankine cycles for refrigerating machine
CN105604620B (en) * 2016-03-08 2018-08-21 浙江大学常州工业技术研究院 A kind of system and method for refrigeration machine auxiliary Organic Rankine Cycle
CN105857155A (en) * 2016-03-30 2016-08-17 时建华 Multi-partition logistics apparatus
CN106246407A (en) * 2016-08-25 2016-12-21 广西大学 A kind of system optimizing engine exhaust heat recovery
CN109931135A (en) * 2019-03-25 2019-06-25 哈尔滨工程大学 A kind of exhaust heat of internal combustion engine gradient utilization system

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Application publication date: 20121114