CN104929805A - Vehicle engine waste heat recycling device using reheat type organic Rankine cycle technology - Google Patents
Vehicle engine waste heat recycling device using reheat type organic Rankine cycle technology Download PDFInfo
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- CN104929805A CN104929805A CN201510344173.XA CN201510344173A CN104929805A CN 104929805 A CN104929805 A CN 104929805A CN 201510344173 A CN201510344173 A CN 201510344173A CN 104929805 A CN104929805 A CN 104929805A
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- working medium
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- waste heat
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
- F02G5/02—Profiting from waste heat of exhaust gases
- F02G5/04—Profiting from waste heat of exhaust gases in combination with other waste heat from combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G2260/00—Recuperating heat from exhaust gases of combustion engines and heat from cooling circuits
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Supercharger (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention aims to provide a vehicle engine waste heat recycling device using a reheat type organic Rankine cycle technology. According to the vehicle engine waste heat recycling device using the reheat type organic Rankine cycle technology, a system conducts multi-stage utilization on waste heat of an engine through reheat type organic Rankine cycle in combination with an engine EGR system, waste heat of a cooling water system is utilized to serve as a heat source acting on a first-stage expansion machine, tail gas exhausted by the engine is adopted to serve as a heat source acting on a second-stage expansion machine, high-temperature gas generated through boosting of a boosting turbine is adopted to preheat condensation working media, and multi-stage utilization of the waste heat of the engine is finished. By means of the vehicle engine waste heat recycling device, the defects that the waste heat loss of a traditional engine is serious, and the fuel economy is low are overcome, the waste heat recycling rate of the engine is increased effectively, the fuel economy of the engine is improved, and meanwhile, the size of the system is reduced.
Description
Technical field
The invention belongs to heat recovery technology field, particularly relate to a kind of vehicular engine waste heat recovering device of reheat type organic Rankine bottoming cycle technology.
Background technique
Rising steadily in recent years along with energy prices, has energy-conservationly become countries in the world question of common concern.Especially along with China's develop rapidly in recent years, increasing substantially of people's living standard, various car owning amount linearly rises, and vehicle fuel amount accounts for nearly 55% of national fuel oil total flow.But research shows: the energy that internal-combustion engine changes useful work into only accounts for the 30%-40% that firing chamber releases energy; To be taken away by engine cooling water system and the energy of discharging into the atmosphere reaches 20%-25%; 40%-45% is accounted for by the energy that tail gas is directly discharged in air, the energy that motor is actual is used for doing work only account for that combustion chambers burn releases energy 1/3rd, wherein the energy of nearly 2/3rds is discharged in surrounding environment by cooling water system tail gas discharge system of unifying, as can be seen here, the Economy of engine fuel effectively can be improved by recycling engine exhaust heat.
At present, automobile engine system mostly adopts EGR (Exhaust Gas Recirculation, exhaust gas recirculatioon) system, it not only can increase the Economy of motor car engine fuel oil but also has good cooling performance, it is the technology that application is maximum at present, its working principle of engine system with egr system is: motor sucks the gas that gas compressor side pressure that air enters turbosupercharger shortens temperature in high pressure into from surrounding environment, because the gas temperature through overcompression is relatively very high, in gas, oxygen density can sharply decline, affect the degree of combustion of fuel oil in firing chamber, incomplete combustion also can produce various harmful gas, so wet body enters in intercooler in high pressure, engine chamber is entered after cooling becomes high pressure low temperature gas, the tail gas part that motor is discharged enters the cooler in egr system, and this part tail gas becomes cryogenic gas through supercooler and enters engine chamber with the high pressure low temperature gas and vapor permeation from intercooler, another part tail gas enters the turbine end expansion work of turbosupercharger, after driving gas compressor acting, is discharged in air.In addition, the cooling water system of motor is taken away a part of waste heat and is entered radiator postback motivation after atmosphere environment cooling, forms a loop.
At present, the technology that engine exhaust heat utilizes mainly is divided into two kinds: utilize engine exhaust heat to carry out thermo-electric generation, utilizes engine exhaust heat to carry out acting generating.Two kinds of each tool pluses and minuses of method: utilize waste heat thermo-electric generation, usual facility compact, structure is simple, and volume is little, but heat recovery efficiency is low; Engine exhaust heat is utilized to carry out acting generating, usual employing Rankine cycle power generation system, under identical high temperature heat source and low-temperature heat source, this power generation system has higher generating efficiency compared with the former, utilization rate of waste heat is higher, but the Rankine cycle power generation system efficiency proposed at present is still lower, this mainly because traditional engine exhaust heat reclaiming system only reclaims engine exhaust heat, does not recycle the waste heat starting cooling water system to take away.In addition, traditional Rankine cycle power generation system structure is complicated, and volume is large, installation and maintenance inconvenience.
Summary of the invention
The defect that the present invention exists to overcome prior art, the object of this invention is to provide a kind of waste heat recovery rate high, fuel economy is high, the vehicular engine waste heat recovering device of the reheat type organic Rankine bottoming cycle technology that system bulk is little.
The technology used in the present invention solution is a kind of vehicular engine waste heat recovering device of reheat type organic Rankine bottoming cycle technology, adopt reheat type Rankine cycle vehicular engine residual neat recovering system both to reclaim engine tail gas waste-heat, again the waste heat of engine cooling water system cools is reclaimed.Comprise First Heat Exchanger, first order decompressor, generator, condenser, liquid container and working medium pump, the cooling water system outlet end of motor is connected with the working medium input end of First Heat Exchanger, the working medium output terminal of First Heat Exchanger is connected with cooling water system entry end, the output terminal of described liquid container is connected with the input end of working medium pump, described working medium delivery side of pump is connected with the medium input end to be heated of regenerator, medium output terminal to be heated is connected with the medium input end to be heated of First Heat Exchanger, the medium output terminal to be heated of First Heat Exchanger is connected with the working medium input end of first order decompressor, the output terminal of described first order decompressor is connected with generator, the output terminal of working medium of described first order decompressor is connected with the input end of condenser, the output terminal of described condenser is connected with the input end of liquid container, described turbosupercharger one end turbine end is connected with the working medium input end of regenerator, the working medium output terminal of regenerator is connected with the inlet end of motor.
Second level decompressor and the second heat exchanger is provided with between described first order decompressor and generator, the working medium output terminal of described first order decompressor is connected with the input end of the medium to be heated of the second heat exchanger, the output terminal of the medium to be heated of the second described heat exchanger is connected with the working medium input end of second level decompressor, the output terminal of described first order decompressor is connected with generator with the output terminal of second level decompressor, the output terminal of the working medium of second level decompressor is connected with the input end of condenser, described turbosupercharger the other end turbine end is connected with the working medium input end of the second heat exchanger.
Compared with prior art, the beneficial effect that the present invention has is: for the height of vehicular engine waste heat supply temperature and the number of heat, carry out multistage rational utilization to vehicular engine waste heat.The a large amount of engine exhaust heats taken out of for engine cooling water system, motor exhaust discharge with waste heat and engine EGR system in the heat that produces of turbocharger compresses gas carry out classified utilization, cover the thermal source of all recoverables of motor.Residual neat recovering system binding engine egr system common heat exchanger parts, save parts, effectively reduce the complexity adopting organic Rankine cycle waste heat recovery generation system.Adopt reheat type organic Rankine bottoming cycle, realize waste heat Multi-class propagation, both ensured the heat recovery efficiency of whole residual heat system, increase Fuel Economy, turn reduce the volume of whole engine exhaust heat reclaiming system.In order to reduce system bulk, reduce the complexity of system, residual neat recovering system in conjunction with vehicular engine egr system working principle can with egr system common sparing assembly.Conventional vehicular engine cooling water system radiator and intercooler adopt Air-cooled Heat Exchanger, this mainly considers that water-cooled heat exchanger has larger volume, structure is more complicated also, but installation residual neat recovering system not only can recycle the waste heat in cooling water effectively, also can not increase its complexity to whole system.The plate type heat exchanger that market is extensively sold is utilized, not only good effect of heat exchange in application, cheap, and compact structure, take volume little.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure:
1, motor, 2, First Heat Exchanger, 3, first order decompressor, the 4, second heat exchanger,
5, second level decompressor, 6, condenser, 7, liquid container, 8, working medium pump, 9, intercooler,
10, generator, 11, cooler for recycled exhaust gas, 12, turbosupercharger one end turbine end,
13, turbosupercharger the other end turbine end.
Embodiment
As shown in Figure 1, a kind of vehicular engine 1 waste heat recovering device of reheat type organic Rankine bottoming cycle technology, comprise First Heat Exchanger 2, first order decompressor 3, generator 10, condenser 6, liquid container 7 and working medium pump 8, decompressor is as the main acting parts of this device, liquid container 7 is used for storing the organic working medium for this device, the electric energy that generator 10 sends is for consumer or dump in storage battery for subsequent use, the cooling water system outlet end of motor 1 is connected with the working medium input end of First Heat Exchanger 2, the working medium output terminal of First Heat Exchanger 2 is connected with cooling water system entry end, the output terminal of described liquid container 7 is connected with the input end of working medium pump 8, the output terminal of described working medium pump 8 is connected with the medium input end to be heated of regenerator, medium output terminal to be heated is connected with the medium input end to be heated of First Heat Exchanger 2, the medium output terminal to be heated of First Heat Exchanger 2 is connected with the working medium input end of first order decompressor 3, the output terminal of described first order decompressor 3 is connected with generator 10, the output terminal of the working medium of described first order decompressor 3 is connected with the input end of condenser 6, the output terminal of described condenser 6 is connected with the input end of liquid container 7, described turbosupercharger one end turbine end 12 is connected with the working medium input end of regenerator, the working medium output terminal of regenerator is connected with the inlet end of motor 1.The intercooler 9 of egr system turbosupercharger plays backheat effect in the present embodiment therefore is called regenerator.
Second level decompressor 5 and the second heat exchanger 4 is provided with, using the tail gas of turbosupercharger outlet end as thermal source between described first order decompressor 3 and generator 10.The working medium output terminal of described first order decompressor 3 is connected with the input end of the medium to be heated of the second heat exchanger 4, the output terminal of medium to be heated of the second described heat exchanger 4 is connected with the working medium input end of second level decompressor 5, the output terminal of described first order decompressor 3 is connected with generator 10 with the output terminal of second level decompressor 5, the output terminal of the working medium of second level decompressor 5 is connected with the input end of condenser 6, high-temperature tail gas promotes to be connected with the working medium input end of the second heat exchanger 4 after turbine is done manual work through turbosupercharger the other end turbine end 13.Second heat exchanger 4 connects the tail gas that turbocharger turbine brings out mouth, using wet body in the high pressure after turbocharger compresses as the thermal source of reheater because again absorbing waste heat therefore also can be described as reheater.Connect pipeline used between each parts and all adopt thread type Placement.Heat exchanger adopts plate type heat exchanger, not only good effect of heat exchange, cheap, and compact structure, takies volume little.
Organic working medium out enters working medium pump 8 from liquid container 7, working medium pump 8 does work supercooled liquid organic working medium being added and be pressed into high pressure, supercooled liquid flows into intercooler 9 and lowers the temperature to the pressurized gas from turbosupercharger, supercooled liquid simultaneously after heat absorption becomes saturated solution and enters First Heat Exchanger 2, after First Heat Exchanger 2 absorbs heat, the superheated vapor that organic working medium becomes High Temperature High Pressure enters first order decompressor 3, promote first order decompressor 3 do work after organic working medium pressure and temperature all can reduce but still be superheated vapor, superheated vapor enters the second heat exchanger 4 be connected with turbosupercharger the other end turbine end 13 along pipeline, the waste heat organic working medium absorbed in the second heat exchanger 4 in tail gas becomes superheated vapor and enters second level decompressor 5, organic working medium after second level decompressor 5 does work enters the condensed fluid that condenser 6 cooling becomes low-temp low-pressure and enters liquid container 7, the once circulation that working medium pump 8 completes motor 1 reheat type organic Rankine bottoming cycle is entered from liquid container 7 organic working medium out.Generator 10 connects the continual output electric energy of decompressor.
In addition, when in 1 of automobile engine cooling water system, the temperature of cooling water maintains 85 DEG C-95 DEG C usually, the most applicable motor 1 normally works, and that is the operating temperature of 1 of automobile engine waste heat recovery generating system maintains about 100 DEG C.Substantially be all applicable to this system for the organic working medium being applied to middle low temperature organic Rankine bottoming cycle, in research, utilization efficiency is high at present, and the organic working medium that environmental pollution is little mainly contains: R245fa, R114, R11, R123 etc.
The requirement of particularity will be had according to the character of organic working medium to the pipeline be applied in native system, general organic working medium all has certain corrosivity, secondly, in the case of a high temperature, organic working medium gas can have very large pressure, so, to consider to some extent pipeline according to reached the in normal operation pressure of selected organic working medium and degree of corrosion when selecting pipeline.
More than show and describe basic principle of the present invention, major character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (2)
1. the vehicular engine waste heat recovering device of a reheat type organic Rankine bottoming cycle technology, it is characterized in that: comprise First Heat Exchanger, first order decompressor, generator, condenser, liquid container and working medium pump, the cooling water system outlet end of motor is connected with the working medium input end of First Heat Exchanger, the working medium output terminal of First Heat Exchanger is connected with cooling water system entry end, the output terminal of described liquid container is connected with the input end of working medium pump, described working medium delivery side of pump is connected with the medium input end to be heated of regenerator, medium output terminal to be heated is connected with the medium input end to be heated of First Heat Exchanger, the medium output terminal to be heated of First Heat Exchanger is connected with the working medium input end of first order decompressor, the output terminal of described first order decompressor is connected with generator, the output terminal of working medium of described first order decompressor is connected with the input end of condenser, the output terminal of described condenser is connected with the input end of liquid container, described turbosupercharger one end turbine end is connected with the working medium input end of regenerator, the working medium output terminal of regenerator is connected with the inlet end of motor.
2. the vehicular engine waste heat recovering device of reheat type organic Rankine bottoming cycle technology according to claim 1, it is characterized in that: between described first order decompressor and generator, be provided with second level decompressor and the second heat exchanger, the working medium output terminal of described first order decompressor is connected with the input end of the medium to be heated of the second heat exchanger, the output terminal of the medium to be heated of the second described heat exchanger is connected with the working medium input end of second level decompressor, the output terminal of described first order decompressor is connected with generator with the output terminal of second level decompressor, the output terminal of the working medium of second level decompressor is connected with the input end of condenser, described turbosupercharger the other end turbine end is connected with the working medium input end of the second heat exchanger.
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| CN201510344173.XA CN104929805A (en) | 2015-06-22 | 2015-06-22 | Vehicle engine waste heat recycling device using reheat type organic Rankine cycle technology |
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| CN201510344173.XA CN104929805A (en) | 2015-06-22 | 2015-06-22 | Vehicle engine waste heat recycling device using reheat type organic Rankine cycle technology |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837440A (en) * | 2017-02-20 | 2017-06-13 | 北京理工大学 | A kind of reheat-type organic Rankine cycle engine residual neat recovering system and control method |
| CN107956525A (en) * | 2017-12-20 | 2018-04-24 | 大连海事大学 | Ship Waste Heat step recycling system based on TEG-ORC combined cycles |
| CN108716435A (en) * | 2018-04-03 | 2018-10-30 | 天津大学 | A kind of pressurization system of internal combustion engine of integrated waste heat recovery |
| CN110645728A (en) * | 2019-09-10 | 2020-01-03 | 北京星际荣耀空间科技有限公司 | Refrigeration cycle system for aircraft and aircraft |
| CN110985230A (en) * | 2019-12-16 | 2020-04-10 | 西安交通大学 | Automobile waste heat recycling system and operation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110985230B (en) * | 2019-12-16 | 2021-03-16 | 西安交通大学 | Automobile waste heat recycling system and operation method thereof |
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Application publication date: 20150923 |