CN105422328A - Evaporator for engine exhaust gas recirculation (EGR) - Google Patents
Evaporator for engine exhaust gas recirculation (EGR) Download PDFInfo
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- CN105422328A CN105422328A CN201510887585.8A CN201510887585A CN105422328A CN 105422328 A CN105422328 A CN 105422328A CN 201510887585 A CN201510887585 A CN 201510887585A CN 105422328 A CN105422328 A CN 105422328A
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- freon
- mainboard
- inlet end
- heat exchange
- motor exhaust
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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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- Exhaust-Gas Circulating Devices (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses an evaporator for engine exhaust gas recirculation (EGR). The evaporator comprises an elastic corrugated metal pipe, an air inlet end cavity, a thin-wall metal shell, an air outlet end cavity and an exhaust gas connecting flange, all of which are sequentially connected. A core is arranged in the thin-wall metal shell. A heat exchange area between the thin-wall metal shell and a core flat pipe is divided into two cooling liquid heat exchange areas, a Freon preheating area and a Freon evaporation overheat area. The temperature of exhaust recirculation gas is reduced, meanwhile, heating boiling is carried out on organic Freon, and energy recycling is achieved. The heat exchange areas are independent of one another, and it can be avoided that the failure or the failure in the service life of products in the extreme case happens, and consequently Freon enters the engine circulation exhaust gas; and meanwhile heat transferring can be enhanced, and the product compactness can be improved.
Description
Technical field
The present invention relates to the exhaust gas recirculation EGR explosive evaporation device that engine waste heat reclaims, belong to waste heat recovery and heat exchanger field, particularly relate to a kind of explosive evaporation device of the motor exhaust recirculation for heavy truck organic Rankine bottoming cycle.
Background technique
Along with increasingly stringent and the enforcement of road vehicle Abgasgesetz, after Europe six Abgasgesetz is implemented, the year two thousand twenty by enter to limit CO2 discharge be main carbon emission regulation implementation phase.For this reason, strict requirement and standard are proposed to the per 100 km fuel consume of motor.For this reason, represent various waste heat recovery technology with Rankine cycle for technology, become one of the most effective means and technology that Shape Of Things To Come reduces CO2 discharge.
Meanwhile, the efficiency of energy utilization of motor is lower, is generally about 40%, and all the other heats of 60% scatter and disappear in a variety of manners and enter air.In motor various forms used heat, maximum with engine exhaust used heat proportion.And pass through the used heat of the tail gas of motor and EGR EGR and cylinder sleeve of engine water to absorb based on the organic Rankine bottoming cycle of waste heat recovery, be converted into Effective power by decompressor to export, thus indirectly promote the discharge of Fuel Economy and reduction CO2.
In the explosive evaporation device of engines exhaust gas recirculation, be the heat that Rankine cycle organic working medium-freon absorbs high-temperature tail gas, then while reducing recycled offgas (cooler for recycled exhaust gas as traditional), absorb the heat of tail gas, realize Conversion of Energy.And in tail gas and refrigerant heat exchanging process, if there is product failure, causing high pressure coolant leakage to enter tail gas, tail gas and refrigerant freon enter engine combustion Indoor Combustion more simultaneously.In this combustion process, freon can because of Pintsch process and with N in air
2react, produce hypertoxic cyanide gas and discharge air, heavy damage and befouling environment.
For this reason, in motor exhaust explosive evaporation device, freon and exhaust gas heat exchange simultaneously, avoid freon to enter tail gas and engine combustion indoor, one of design key point becoming motor exhaust explosive evaporation device.All soldering processes are adopted, with plate isolation tail gas and freon, because solder joint is excessive through document patent No. US2012-0285167 and patent No. US2013-0205766, potential failure is very risky, once reveal, freon is easy to enter in recirculation tail gas, causes the discharge of motor violent in toxicity.
Summary of the invention
The present invention is to solve the problems referred to above that prior art exists, aim to provide a kind of ebullator for motor exhaust recirculation EGR.
For solving the problem, the present invention is by the following technical solutions: a kind of ebullator for motor exhaust recirculation EGR, comprise the elastic corrugated metal tube connected successively, inlet end chamber, thin-wall metal shell, outlet side chamber and tail gas adpting flange, fuse is provided with in described thin-wall metal shell, described fuse comprises at least one rows of flat pipes, inlet end mainboard, the secondary mainboard of inlet end, middle secondary mainboard, the secondary mainboard in outlet side and outlet side mainboard, the two ends of described flat tube respectively with described inlet end chamber and outlet side chamber UNICOM, the heat exchange area that it is characterized in that between described thin-wall metal shell and flat tube is separated into the first cooling liquid heat exchange area between the secondary mainboard of outlet side mainboard and outlet side, freon preheated zone between the secondary mainboard in outlet side and the secondary mainboard in centre, the vaporized thermal region of freon between middle secondary mainboard and the secondary mainboard of inlet end and the second cooling liquid heat exchange area between the secondary mainboard of inlet end and inlet end mainboard, on described thin-wall metal shell, corresponding above-mentioned each region place is respectively equipped with the first cooling liquid inlet, the first cooling liquid outlet, the first freon import, the first freon outlet, the second freon import, the second freon outlet, the second cooling liquid inlet and the second cooling liquid outlet, the first described freon outlet and the second freon import UNICOM.
A kind of ebullator for motor exhaust recirculation EGR of the present invention, has following characteristics:
1, the present invention adopts EGR ebullator integrated in Organic Rankine Cycle ORC Waste Heat Recovery System (WHRS).This EGR ebullator mainly utilizes organic substance Freon medium to absorb the tail gas heat quantity of motor exhaust recirculation, transfers the acting Working medium gas for High Temperature High Pressure to.This device is reducing the temperature of exhaust gas recirculation gas simultaneously, the recovery (that is to say the freon steam organic refrigerant freon being heated into High Temperature High Pressure from highly pressurised liquid, realize energy regenerating as the working medium promoting decompressor acting) that ebuillition of heated realizes energy is carried out to Organic fluoride Leon.
2, on whole stainless steel flat tube, 3 secondary mainboards are placed, whole heat exchanger core is divided into 4 heat exchanger zones independent of one another, according to inlet exhaust gas to outlet flow to, 4 regions are respectively the first cooling liquid heat exchange area of the second cooling liquid heat exchange area, the vaporized thermal region of freon, freon preheated zone and afterbody, product can be avoided to lose efficacy in extreme circumstances or lost efficacy in lifetime and caused freon to enter in cycle of engine tail gas, simultaneously can also augmentation of heat transfer and raising product compactedness.
3, engine coolant passage is set at the in-out end of tail gas.This cooling passage is conducive to the wall surface temperature reducing flat tube and mainboard, and protection flat tube and mainboard soldered joint improve durability; In extreme circumstances, if freon refrigerant leaks, coolant leakage in engine cooling fluid circulation, thus enters engine combustion after avoiding coolant leakage tail gas, produces hypertoxic tail gas simultaneously.
As improvement of the present invention, for guaranteeing that freon has enough degrees of superheat from the outlet of explosive evaporation device, in described freon preheated zone, motor exhaust becomes counter-flow arrangement with liquid freon; At the vaporized thermal region of described freon, the motor exhaust of high temperature and freon are down current arrangement, to improve heat transfer effect.In tail gas high-temperature part, first high temperature recirculation tail gas carry out heat exchange with gas-liquid two-phase freon, because the freon gas-liquid Gas-liquid phase region coefficient of heat transfer is huge, cause the fluid temperature (F.T.) of tube wall temperature close to freon of thin-wall metal shell, avoid freon contact with high-temperature metal wall and cause the thermal cracking of freon.
As a further improvement on the present invention, in the vaporized thermal region of described freon, also hydraulic barrier is provided with.Described hydraulic barrier is two pieces, is placed in top and the bottom in this region respectively, forms mazy passage.Described hydraulic barrier is arranged near described second cooling liquid heat exchange area.Temperature in this region due to tail gas is very high, by placing hydraulic barrier between flat tube, flow velocity and the heat exchange coefficient of freon can be improved, thus reduce the surface temperature of the metal wall such as flat tube and the second secondary mainboard, reduce thermal expansion sex change and avoid the thermal cracking of freon and high-temperature metal wall.
Improve further as of the present invention, the distance between described inlet end mainboard and the secondary mainboard of inlet end is 20 ~ 30mm again; Distance between the secondary mainboard of described outlet side mainboard and outlet side is 20 ~ 30mm.
Improve further again as of the present invention, place ripple type enhanced heat transfer fin in described flat tube inside, the flow-disturbing of fluid in pipe inside can be improved, destroy fluid boundary layer, realize augmentation of heat transfer object, and small product size and weight can be reduced.This fin belongs to non-discontinuous form fin, effectively can improve heat transfer, is unfavorable for the accumulation in metal surface of carbon distribution simultaneously.
As a further improvement on the present invention, in the heat exchange area of freon, between flat tube and flat tube, place serrated fin 21, to realize at augmentation of heat transfer simultaneously, improving freon side compressive strength.
As a further improvement on the present invention, in described freon preheated zone, the serrated fin between flat tube is imported and exported the diagonal angle place be connected with freon and cut out two chamferings, the flow uniformity of refrigerant freon can be improved.
Further improve as of the present invention, complete machine adopts stainless steel material, and fuse is assembled by nickel-based brazing technique, to avoid the generation of the acid gas component etching problem of other welding consumabless; Fuse is connected by argon arc welding with outside thin-walled metallic case, realizes independent heat exchange and the flowing of each heat exchange area.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Fig. 1 is the medium flow chart of a kind of ebullator for motor exhaust recirculation EGR of the present invention.
Fig. 2 is the structural representation of a kind of ebullator for motor exhaust recirculation EGR of the present invention.
Fig. 3 is the External view of a kind of ebullator for motor exhaust recirculation EGR of the present invention.
Fig. 4 is the structural representation after the present invention removes thin-wall metal shell.
Fig. 5 is the structural representation of fuse of the present invention.
Fig. 6 is the structural representation of mainboard of the present invention.
Fig. 7 is the structural representation of the secondary mainboard of the present invention.
Fig. 8 is the structural representation of hydraulic barrier of the present invention.
Fig. 9 is the structural representation of flat tube of the present invention.
Figure 10 is the structural representation of ripple type enhanced heat transfer fin of the present invention.
Figure 11 is the structural representation of serrated fin of the present invention.
Embodiment
With reference to accompanying drawing, a kind of ebullator for motor exhaust recirculation EGR of the present invention, comprise the elastic corrugated metal tube 1 connected successively, inlet end chamber 2, thin-wall metal shell 5, outlet side chamber 22 and tail gas adpting flange 6, fuse 3 is provided with in described thin-wall metal shell 5, described fuse 3 comprises at least one rows of flat pipes 15, inlet end mainboard 16, the secondary mainboard 17 of inlet end, middle secondary mainboard 18, the secondary mainboard 23 in outlet side and outlet side mainboard 24, the two ends of described flat tube 15 respectively with described inlet end chamber 2 and outlet side chamber 22 UNICOM, heat exchange area between described thin-wall metal shell 5 and flat tube 15 is separated into the first cooling liquid heat exchange area 34 between the secondary mainboard 23 of outlet side mainboard 24 and outlet side, freon preheated zone 33 between the secondary mainboard 23 in outlet side and the secondary mainboard 18 in centre, the vaporized thermal region 32 of freon between middle secondary mainboard 18 and the secondary mainboard 17 of inlet end and the second cooling liquid heat exchange area 31 between the secondary mainboard 17 of inlet end and inlet end mainboard 16, on described thin-wall metal shell 5, corresponding above-mentioned each region place is respectively equipped with first cooling liquid inlet 10, first cooling liquid outlet 9, first freon import 14, first freon outlet 13, second freon import 11, second freon outlet the 7, second cooling liquid inlet 8 and the second cooling liquid outlet 7, the first described freon outlet 13 and the second freon import 11 UNICOM.
One group of flat metal tube 15 is the shaping flat metal tubes of the flat tube of many laser bonding or integral die-cast, be inserted in the secondary mainboard 17 of inlet end, the secondary mainboard 23 of middle secondary mainboard 18 and outlet side as required in flat tube relevant position, at pipe two ends, root is connected with inlet end mainboard 16 and outlet side mainboard 24.On a fuse, according to thermodynamic parameter and heat-transfer capability, can be designed to a rows of flat pipes also can be two combs.In present embodiment, adopt 2 combs, composition exhaust gas channel.
In described freon preheated zone 33, motor exhaust becomes counter-flow arrangement with liquid freon; At the vaporized thermal region 32 of described freon, the motor exhaust of high temperature and freon are down current arrangement.
Hydraulic barrier 19 is also provided with in the vaporized thermal region 32 of described freon.Described hydraulic barrier 19 is two pieces, is placed in top and the bottom in this region respectively, forms mazy passage.Described hydraulic barrier 19 is arranged near described first cooling liquid chamber 31.Temperature in this region due to tail gas is very high, pass through hydraulic barrier, flow velocity and the heat exchange coefficient of freon can be improved, thus reduce the surface temperature of the metal wall such as flat tube and the second secondary mainboard, reduce thermal expansion sex change and avoid the thermal cracking of freon and high-temperature metal wall.
Distance between described inlet end mainboard 16 and the secondary mainboard 17 of inlet end is 20 ~ 30mm; Distance between the secondary mainboard 23 of described outlet side mainboard 24 and outlet side is 20 ~ 30mm.
Place ripple type enhanced heat transfer fin 20 in described flat tube 15 inside, the flow-disturbing of fluid in pipe inside can be improved, destroy fluid boundary layer, realize augmentation of heat transfer object, and small product size and weight can be reduced.This fin belongs to non-discontinuous form fin, effectively can improve heat transfer, is unfavorable for the accumulation in metal surface of carbon distribution simultaneously.
In the heat exchange area of freon, between adjacent flat tube 15, place serrated fin 21, to realize at augmentation of heat transfer simultaneously, improving freon side compressive strength.In described freon preheated zone 33, the serrated fin 21 between flat tube 15 is imported and exported the diagonal angle place be connected with freon and cuts out two chamferings 25, the flow uniformity of refrigerant freon can be improved.
The present invention adopts corrugated tube type structure in structural type, utilizes mainboard, secondary mainboard, fin between flat tube and pipe, is realized the assembling of explosive evaporation device fuse by Welding technique.Due to the requirement of apply engine rugged environment of the present invention, complete machine is selected to adopt stainless steel material, and fuse 3 welding procedure adopts nickel-based brazing technique, to avoid the acid gas component etching problem of other welding consumabless.Fuse 3 is connected by argon arc welding with outside thin-walled metallic case 5, realizes independent heat exchange and the flowing of each heat exchange area.
The present invention has three tunnel medium loop, i.e. tail gas loop, coolant circuit and freon loop.
In tail gas loop, the high-temperature tail gas of discharging from motor enters from elastic corrugated metal tube 1, through inlet end chamber 2, flat tube 15 and outlet side chamber 22, discharges from tail gas adpting flange 6.
Coolant circuit has two loops being positioned at fuse two ends.In the first loop, cooling liquid enters the first cooling liquid heat exchange area 34 from the first cooling liquid inlet 10, then discharges from the first cooling liquid outlet 9.In the second loop, cooling liquid enters the second cooling liquid heat exchange area 31 from the second cooling liquid inlet 8, then discharges from the second cooling liquid outlet 7.
In freon loop, liquid freon enters freon preheated zone 33 from the first freon import 14, carry out heat exchange with the tail gas in flat tube in this region, discharge from the first freon outlet 13 after forming vehicle repair major freon and enter the vaporized thermal region 32 of freon from the second freon import 11 again.In the region, the high-temperature tail gas in vehicle repair major freon and flat tube carries out further heat exchange and produces and gasify, and the freon of gaseous state is from the second freon outlet 7.
It is understood that above-described embodiment is just to explanation of the present invention, instead of limitation of the present invention, any innovation and creation do not exceeded in spirit of the present invention, all fall within protection scope of the present invention.
Claims (9)
1. the ebullator for motor exhaust recirculation EGR, comprise the elastic corrugated metal tube (1) connected successively, inlet end chamber (2), thin-wall metal shell (5), outlet side chamber (22) and tail gas adpting flange (6), fuse (3) is provided with in described thin-wall metal shell (5), described fuse (3) comprises at least one rows of flat pipes (15), inlet end mainboard (16), the secondary mainboard (17) of inlet end, middle secondary mainboard (18), the secondary mainboard (23) in outlet side and outlet side mainboard (24), the two ends of described flat tube (15) respectively with described inlet end chamber (2) and outlet side chamber (22) UNICOM, the heat exchange area that it is characterized in that between described thin-wall metal shell (5) and flat tube (15) is separated into the first cooling liquid heat exchange area (34) between the secondary mainboard (23) of outlet side mainboard (24) and outlet side, freon preheated zone (33) between the secondary mainboard (23) in outlet side and the secondary mainboard in centre (18), the vaporized thermal region of freon (32) between middle secondary mainboard (18) and the secondary mainboard (17) of inlet end and the second cooling liquid heat exchange area (31) between the secondary mainboard (17) of inlet end and inlet end mainboard (16), the first cooling liquid inlet (10), the first cooling liquid outlet (9), the first freon import (14), the first freon outlet (13), the second freon import (11), the second freon outlet (7), the second cooling liquid inlet (8) and the second cooling liquid outlet (7) is respectively equipped with at the upper corresponding above-mentioned each region place of described thin-wall metal shell (5), the first described freon outlet (13) and the second freon import (11) UNICOM.
2. a kind of ebullator for motor exhaust recirculation EGR as claimed in claim 1, is characterized in that motor exhaust becomes counter-flow arrangement with liquid freon in described freon preheated zone (33); At the vaporized thermal region of described freon (32), the motor exhaust of high temperature and freon are down current arrangement.
3. a kind of ebullator for motor exhaust recirculation EGR as claimed in claim 1, is characterized in that also being provided with hydraulic barrier (19) in the vaporized thermal region of described freon (32).
4. a kind of ebullator for motor exhaust recirculation EGR as claimed in claim 3, is characterized in that described hydraulic barrier (19) is two pieces, is placed in top and the bottom in this region respectively, forms mazy passage.
5. a kind of ebullator for motor exhaust recirculation EGR as claimed in claim 4, is characterized in that described hydraulic barrier (19) is arranged near described second cooling liquid heat exchange area (31).
6. a kind of ebullator for motor exhaust recirculation EGR as claimed in claim 1, is characterized in that the distance between described inlet end mainboard (16) and the secondary mainboard (17) of inlet end is 20 ~ 30mm; Distance between the secondary mainboard (23) of described outlet side mainboard (24) and outlet side is 20 ~ 30mm.
7. a kind of ebullator for motor exhaust recirculation EGR as claimed in claim 1, is characterized in that the heat exchange area at freon, places serrated fin (21) between flat tube (15) and flat tube (15).
8. a kind of ebullator for motor exhaust recirculation EGR as claimed in claim 7, it is characterized in that in described freon preheated zone (33), above import and export with freon the diagonal angle place be connected cuts out two chamferings (25) to the serrated fin (21) between flat tube (15).
9., as a kind of ebullator for motor exhaust recirculation EGR of claim 1-8 as described in any one, it is characterized in that complete machine adopts stainless steel material, fuse (3) is assembled by nickel-based brazing technique; Fuse (3) is connected by argon arc welding with outside thin-walled metallic case (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510887585.8A CN105422328B (en) | 2015-12-04 | 2015-12-04 | A kind of evaporator for motor exhaust recycling EGR |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510887585.8A CN105422328B (en) | 2015-12-04 | 2015-12-04 | A kind of evaporator for motor exhaust recycling EGR |
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| CN105422328A true CN105422328A (en) | 2016-03-23 |
| CN105422328B CN105422328B (en) | 2018-01-12 |
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Cited By (4)
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| CN105953617A (en) * | 2016-05-04 | 2016-09-21 | 浙江银轮机械股份有限公司 | Core for engine tail gas evaporation superheater |
| CN106939853A (en) * | 2017-05-09 | 2017-07-11 | 浙江银轮机械股份有限公司 | Evaporator for engines exhaust gas recirculation |
| CN108626037A (en) * | 2018-06-11 | 2018-10-09 | 山东宇洋汽车尾气净化装置有限公司 | A kind of close-coupled cooler for recycled exhaust gas |
| CN114000960A (en) * | 2020-07-28 | 2022-02-01 | 广州汽车集团股份有限公司 | EGR system and car |
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| CN108626037A (en) * | 2018-06-11 | 2018-10-09 | 山东宇洋汽车尾气净化装置有限公司 | A kind of close-coupled cooler for recycled exhaust gas |
| CN114000960A (en) * | 2020-07-28 | 2022-02-01 | 广州汽车集团股份有限公司 | EGR system and car |
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| CN105422328B (en) | 2018-01-12 |
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Denomination of invention: An evaporator for EGR of engine exhaust gas recirculation Effective date of registration: 20210610 Granted publication date: 20180112 Pledgee: Bank of China Limited by Share Ltd. Tiantai County branch Pledgor: ZHEJIANG YINLUN MACHINERY Co.,Ltd. Registration number: Y2021330000510 |
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