CN1434200A - Pressure increased diesel wet air-diesel homogeneous combustion system - Google Patents
Pressure increased diesel wet air-diesel homogeneous combustion system Download PDFInfo
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- CN1434200A CN1434200A CN 03115551 CN03115551A CN1434200A CN 1434200 A CN1434200 A CN 1434200A CN 03115551 CN03115551 CN 03115551 CN 03115551 A CN03115551 A CN 03115551A CN 1434200 A CN1434200 A CN 1434200A
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Abstract
The supercharged diesel engine wet air-diesel oil homogeneous combustion system is characterized by that it adopts the Venturi tube and waste gas recirculation pipe device to introdue small quantity of waste gas, utilizes the high temperature of waste gas to quickly evaporate fuel oil, and introduces it into cylinder from tail end of air intake pipe of diesel engine. It also uses air humidifying device to humidity pressurized air and control air temperature, and utilizes the moisture capacity of air to control temperature and composition of working medium so as to indirectly control combustion process. Said system can be used for easily preparing diesel oil/air mixed gas, can be self-regulated, and can implement low-discharge combustion.
Description
Technical field
What the present invention relates to is a kind of supercharged diesel engine homogeneous combustion system, particularly a kind of passing through to the air inlet humidification, oil spout prepares supercharged diesel engine wet air-Diesel HCCI Combustion Using Internal system that diesel oil/air pre-mixing is closed gas in the exhaust gas reclrculation pipe, belongs to technical field of internal combustion engines.
Background technique
In order to satisfy strict day by day emission regulation demands, diesel engine is faced with great challenge.Each diesel engine manufacturer and research unit carry out the research that reduces diesel emission one after another, and these researchs comprise the many-side research of substitute fuel, combustion system, reprocessing, electronic control etc.With regard to the combustion system of diesel engine, its combustion manner is a diesel oil spraying compression ignite, and petroleum distribution is very inhomogeneous in the cylinder, and this non-homogeneous burning produces localized hyperthermia, anoxic, causes noxious emission products such as Nox, particle higher.This combustion manner is difficult to reach the emission regulation demands of strictness.In order fundamentally to improve the emission problem of diesel engine, should change this spraying diffusion combustion mode of diesel engine.
The notion of homogeneous combustion has fundamentally changed the traditional combustion mode of diesel engine.It is before burning takes place, and diesel oil and even air are mixed, and during near top dead center, the inflammable mixture multiple spot in the cylinder is pressuring combustion ignition simultaneously, and burning rapidly in compression stroke.Therefore this combustion manner can make Nox and particulate emission reduce greatly owing to do not have localized hyperthermia district and local oxygen-rich area simultaneously.The homogeneous combustion mode is to make diesel engine satisfy the most promising combustion manner of stricter Abgasgesetz (ultra-low emissions vehicle ULEV).But, proposing existing 20 years so far the earliest from the homogeneous combustion notion, the research overwhelming majority of this respect also rests on experimental stage.This is because realize that homogeneous combustion, especially Diesel HCCI Combustion Using Internal have several difficult points: 1, diesel oil is not volatile, and the preparation of diesel steam and air mixture is difficulty relatively, in other words, is exactly that homogeneous is difficult to realize; 2, because homogeneous combustion is that inflammable mixture compression ignite multiple spot catches fire, burning initial point and rate of burning all can not directly be controlled by oil spout, so the control ratio of its combustion process is difficult, that is to say that the multiple spot compression ignite is difficult to control.In order to realize Diesel HCCI Combustion Using Internal, in prior art, Thomas W.Ryan III and Timothy J.Callahan are in the SAE paper of delivering " Homogeneous Charge Compression Ignition of Diesel Fuel ", adopt exhaust gas reclrculation pipe and back pressure control valve to realize big ER EGR Rate, and realize the homogeneous combustion of diesel oil in the oil spout of diesel engine intake road.In the article, when compression ratio is 8: 1, ER EGR Rate is 45%～50% o'clock, can access comparatively ideal homogeneous combustion process, but operating mode scope that in test can operating homogeneous combustion process is very little, is easy to generate pinking and catches fire.In the oil spout of diesel engine intake road, can make fuel oil be sprayed onto intake duct wall and cylinder wall, cause long-pending oil, lubricating oil dilution and very high HC/CO discharging.This in addition scheme needs air inlet to have higher temperature to be beneficial to the evaporation of fuel oil, but the intake temperature height raises the compression process temperature, easily produces pinking, makes decrease in efficiency.Therefore such scheme needs bigger ER EGR Rate (40%～60%) to improve intake temperature, controls the compression process finishing temperature simultaneously.To the supercharged diesel engine of actual motion, realize that so big ER EGR Rate has difficulties.In addition, the mode in the literary composition can only realize Diesel HCCI Combustion Using Internal in less operating mode scope.If diesel engine condition changes slightly, pinking then takes place easily or catch fire.In the article " Nox Emission Reduction withThe Humid Air Motor Concept " of EmmanuelRiom in calendar year 2001 23 CIMAC international conferences, with humidifier the air inlet humidification is reduced the in-cylinder combustion maximum temperature, reduce the discharging of supercharged diesel engine for ship Nox.Test result is that Nox drops to 3.5g/kWh from 13.5g/kWh, and oil consumption and other emission product are not had influence substantially.But the combustion system of this test is the spraying diffusive combustion of conventional diesel engine, so particulate emission does not have improvement substantially.
Summary of the invention
Be deficiency and the defective that overcomes prior art, the present invention adopts the oil spout of exhaust gas reclrculation pipe entrance point to prepare diesel oil/air homogeneous charge to supercharged diesel engine, adopt exhaust gas reclrculation pipe and Venturi tube device to introduce small amount of exhaust gas, utilize the high temperature of waste gas to make the very fast evaporation of fuel oil, enter in the cylinder by diesel engine intake pipe end again; Use the air inlet damping device, control intake temperature on the one hand,, utilize temperature and composition in the water content control cylinder internal procedure of air, control combustion process indirectly on the other hand to air wetting.
System of the present invention is by diesel engine, turbosupercharger, oil nozzle, exhaust gas reclrculation pipe, Venturi tube, mixing chamber, humidifier, water tank, preheating heat exchanger, heat exchanger, water pump, valve and connecting pipeline are formed again.The pressurized machine entrance point communicates with atmosphere, and the supercharger outlet end links to each other with the air intlet of humidifier lower end, and the wet air outlet of humidifier upper end links to each other with Venturi tube, and the Venturi tube outlet is connected with the suction tude of diesel engine; The exhaust gas reclrculation pipe import connects Diesel Engine Exhaust Pipe, and entrance point has diesel oil/waste gas mixing chamber, mixes with waste gas mixing chamber from the fuel oil of oil nozzle ejection; The exhaust gas reclrculation pipe outlet links to each other with Venturi tube.Humidifier bottom circulating water outlet links to each other with water tank, the water tank outlet is connected with the preheating heat exchanger tube side by pipeline, the outlet of this heat exchanger tube side is connected with heat exchanger tube side again by pipeline, this heat exchanger tube side outlet is connected with water pump by pipeline, and exit of pump is connected with the humidifier circulating water intake by pipeline.The preheating heat exchanger shell side communicates with the diesel engine cycle chilled(cooling) water return (CWR), the logical turbine final vacuum of heat exchanger shell side again.
Air improves through pressure behind the pressurized machine, and temperature rises, and arrives humidifier, and air inlet is become near saturated wet air by humidification in humidifier.Oil nozzle sprays into mixer at the exhaust gas reclrculation pipe starting end with fuel oil, and fuel oil evaporates under exhaust high temperature, and enters in the cylinder after EGR gas is joined by Venturi tube and saturated wet vapor.The water yield that is used for humidification circulates by the water route and supplies.After entering cyclic water tank and circulating water mixes, supplementing water enters preheating heat exchanger, launched machine recirculated cooling water heating (preheating), and then enter heat exchanger again, and further heated by the waste gas of discharging from turbine, arrive humidifier through circulating water pump at last.In humidifier, high pressure water sprays from shower nozzle, and mixes with air inlet that anti-phase flows, and the air inlet humidification is arrived nearly saturation state.The water that condenses in humidifier flows out to cyclic water tank from the humidifier bottom.Valve control water circulation path is with the temperature of control circle water.
When system moves, spray into tiny diesel oil drop very fast evaporation under the effect of exhaust higher temperature of exhaust gas reclrculation pipe.The fuel oil of evaporation enters suction tude and mixes with wet air from Venturi tube.Intake temperature and pressure after being pressurized are higher, and under high operating mode, intake temperature can reach 150～170 ℃ behind the pressurized machine; In humidifier, air inlet is by humidification and cooling, and water content can reach 20%～30%.When motor operates in different operating mode, control intake temperature and composition by regulating air inlet humidification amount, the temperature of terminal point is compressed in control indirectly, and the moment and velocity of combustion take place in final control burning.When motor operates in high load, increase the humidification amount, may command intake temperature and compression terminal temperature prevent that it is too high like this, making catches fire can just not take place when compression process finishes, and suppresses pinking.Increase water content simultaneously and can control velocity of combustion, prevent too high pressure of explosion.When load reduces, reduce the humidification amount, keep compression ignite multiple spot catch fire required compression terminal temperature and O2 concentration, burning can be carried out smoothly, do not catch fire.
The present invention has compared several characteristics with other methods that realize Diesel HCCI Combustion Using Internal: 1, be easy to prepare diesel oil/air homogeneous charge.Adopt a spot of amount of exhaust gas recirculation (flash evaporation that can satisfy diesel oil gets final product) and in exhaust gas reclrculation pipe import oil spout.Purpose is to utilize the high temperature of exhaust that fuel oil can be evaporated rapidly.Though mixing the back temperature with air inlet, EGR gas can decrease, but because air inlet is the cooling of supercharging humidification, temperature is relatively still higher, can reach more than 100 ℃, and the time of experiencing in from the suction tude end to cylinder is shorter, needs the time and condense, therefore fuel-steam can not liquefy substantially, even a spot of liquefaction is arranged, can not generate big drop yet, can be evaporated very soon in the compression process afterwards.2, combustion process is easier to control.This has the reason of two aspects, at first, when controlling burning with the exhaust gas recirculation mode, postpones in order to make point of ignition, increase amount of exhaust gas recirculation, but the amount of exhaust gas recirculation increase makes again intake temperature rise, and makes and catches fire in advance.Therefore amount of exhaust gas recirculation is to the more complicated that influences of combustion process, and its effect is not unidirectional.Therefore the homogeneous combustion scope that can realize with the exhaust gas recirculation mode is very limited, and restive.Among the present invention, use wet air to replace EGR gas control combustion process, when load increases, suction pressure, temperature rise, cause more circulating water evaporation, water content increases, and has suppressed the rising of temperature in intake temperature and the compression process, and these have all been controlled, and catching fire of causing shifts to an earlier date because load rises.Therefore native system can be regulated the control burning according to operating mode to a great extent automatically.Another reason is that water vapor is compared with air, gas of combustion, and specific heat at constant pressure is much bigger, so same ratio, and water vapor is more much bigger than pure waste gas to the influence of cylinder temperature.So the temperature of utilizing the water content of wet air and wet air should be than big with exhaust gas recirculation to the regulation range of in-cylinder combustion process.
Description of drawings
Fig. 1 is supercharged diesel engine wet air-Diesel HCCI Combustion Using Internal systematic schematic diagram
1 is turbosupercharger among the figure, the 2nd, and oil nozzle, the 3rd, exhaust gas reclrculation pipe, the 4th, Venturi tube, the 5th, diesel exhaust mixing chamber, the 6th, humidifier, the 7th, supercharged diesel engine, the 8th, water pump, the 9th, water tank, the 10th, preheating heat exchanger, the 11st, heat exchanger again, 12～15th, control valve.
Solid line is represented gas circulation among the figure, and dotted line is represented water cycle.
Embodiment
Below in conjunction with accompanying drawing concrete enforcement of the present invention is further described:
As shown in Figure 1, the present invention mainly comprises: turbosupercharger 1, oil nozzle 2, exhaust gas reclrculation pipe 3, Venturi tube 4, mixing chamber 5, humidifier 6, diesel engine 7, water pump 8,, water tank 9, preheating heat exchanger 10, heat exchanger 11 again, control valve 12～15 and connecting pipeline etc.The pressurized machine entrance point of turbosupercharger 1 communicates with atmosphere, and the supercharger outlet end links to each other with the air intlet of humidifier 6 lower ends, and humidifier 6 upper end wet air outlets link to each other with Venturi tube 4 imports, and Venturi tube 4 outlets are connected with the suction tude of diesel engine 7; Exhaust gas reclrculation pipe 3 imports communicate with the outlet pipe of diesel engine 7, and at entrance point diesel oil/waste gas mixing chamber 5 are housed, and in mixing chamber 5 upper ends oil nozzle 2 are housed, and exhaust gas reclrculation pipe 3 outlets link to each other with Venturi tube 4.Humidifier 6 bottom circulating water outlets link to each other with water tank 9, water tank 9 outlet respectively by valve 12 and 14 and preheating heat exchanger 10 and again heat exchanger 11 tube side imports join.In preheating heat exchanger 10 tube sides import and export pipeline bypass circulation, bypass valve 13 is housed, in the heat exchanger 11 tube sides import and export pipeline bypass circulation bypath valve 15 is being housed again.The outlet of heat exchanger 11 tube sides is connected with water pump 8 imports by pipeline again, the shell side of preheating heat exchanger 10 links to each other with the diesel engine cycle chilled(cooling) water return (CWR), the shell side of heat exchanger 11 links to each other with turbine final vacuum pipeline again, and water pump 8 outlets are connected with humidifier 6 circulating water intakes by pipeline.
System's running is as follows: air improves through pressurized machine 1 back pressure, and temperature rises, and arrives humidifier 6, and air inlet is become near saturated wet air by humidification in humidifier 6, and simultaneous temperature reduces.Oil nozzle 2 sprays into mixer 5 at exhaust gas reclrculation pipe 3 starting ends with fuel oil, and fuel oil evaporates under exhaust high temperature, and enters in the cylinder after EGR gas is joined by Venturi tube 4 and saturated wet vapor.The water yield that is used for humidification circulates by the water route and supplies.After entering cyclic water tank 9 and circulating water mixes, supplementing water enters preheating heat exchanger 10, launched machine recirculated cooling water heating (preheating), and then enter again heat exchanger 11, and further heated by the waste gas of discharging from the turbine end of turbosupercharger 1, arrive humidifier 6 through circulating water pump 8 at last.In humidifier 6, high pressure water sprays from shower nozzle, and mixes with air inlet that anti-phase flows, and the air inlet humidification is arrived nearly saturation state.The water that condenses in humidifier 6 flows out to cyclic water tank 9 from humidifier 6 bottoms.Valve 12～15 control water circulation paths are with the temperature of control circle water.
When system moves, spray into tiny diesel oil drop very fast evaporation under the effect of exhaust higher temperature of exhaust gas reclrculation pipe 3.The fuel oil of evaporation enters suction tude and mixes with wet air from Venturi tube 4.Intake temperature and pressure after being pressurized are higher, and under high operating mode, the supercharger outlet intake temperature of turbosupercharger 1 can reach 150～170 ℃; In humidifier 6, air inlet is by humidification and cooling, and water content can reach 20%～30%.When motor operated in different operating mode, by regulating air inlet humidification amount control intake temperature and composition, the temperature of terminal point was compressed in control indirectly, and the moment and velocity of combustion take place in final control burning.When motor operates in high load, increase the humidification amount, may command intake temperature and compression terminal temperature prevent that it is too high like this, making catches fire can not finish just to take place in compression process, suppresses pinking.Increasing water content simultaneously can control velocity of combustion and prevent too high pressure of explosion.When load reduces, reduce the humidification amount, keep compression ignite multiple spot catch fire required compression terminal temperature and O
2Concentration can be carried out burning smoothly, does not catch fire.
Claims (1)
1, a kind of supercharged diesel engine wet air-Diesel HCCI Combustion Using Internal system, mainly comprise turbosupercharger (1), oil nozzle (2), exhaust gas reclrculation pipe (3), Venturi tube (4), diesel exhaust mixing chamber (5), humidifier (6), diesel engine (7), water pump (8),, water tank (9), preheating heat exchanger (10), heat exchanger (11) again, control valve (12～15) and connecting pipeline etc. is characterized in that the pressurized machine entrance point of turbosupercharger (1) communicates with atmosphere, and the supercharger outlet end links to each other with the air intlet of humidifier (6) lower end, the wet air outlet of humidifier (6) upper end links to each other with Venturi tube (4) import, and Venturi tube (4) outlet is connected with the suction tude of diesel engine (7); Exhaust gas reclrculation pipe (3) import communicates with the outlet pipe of diesel engine (7), and at entrance point diesel oil/waste gas mixing chamber (5) is housed, and in mixing chamber (5) upper end oil nozzle (2) is housed, and exhaust gas reclrculation pipe (3) outlet links to each other with venturi (4).Humidifier (6) bottom circulating water outlet links to each other with water tank (9), water tank (9) outlet respectively by valve (12) and (14) and preheating heat exchanger (10) and again heat exchanger (11) tube side import join, in preheating heat exchanger (10) tube side import and export pipeline bypass circulation, bypass valve (13) is housed, in heat exchanger (11) the tube side import and export pipeline bypass circulation bypath valve (15) is being housed again, the outlet of heat exchanger (11) tube side is connected with water pump (8) import by pipeline again, the shell side of preheating heat exchanger (10) links to each other with the diesel engine cycle chilled(cooling) water return (CWR), the shell side of heat exchanger (11) links to each other with turbine final vacuum pipeline again, and water pump (8) outlet is connected with humidifier (6) circulating water intake by pipeline.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03115551 CN1212474C (en) | 2003-02-27 | 2003-02-27 | Pressure increased diesel wet air-diesel homogeneous combustion system |
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| CN 03115551 CN1212474C (en) | 2003-02-27 | 2003-02-27 | Pressure increased diesel wet air-diesel homogeneous combustion system |
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| CN1434200A true CN1434200A (en) | 2003-08-06 |
| CN1212474C CN1212474C (en) | 2005-07-27 |
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| CN 03115551 Expired - Fee Related CN1212474C (en) | 2003-02-27 | 2003-02-27 | Pressure increased diesel wet air-diesel homogeneous combustion system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419240C (en) * | 2004-03-31 | 2008-09-17 | 五十铃自动车株式会社 | Diesel engine |
| CN101175915B (en) * | 2005-05-18 | 2010-05-19 | 斯堪尼亚有限公司 | Arrangement for recirculation of exhaust gases of a supercharged internal combustion engine |
| CN101338698B (en) * | 2007-07-02 | 2010-08-04 | 曼狄赛尔公司 | Humid air diesel motor |
| WO2014079219A1 (en) * | 2012-11-26 | 2014-05-30 | Tian Jiaming | Supercharged engine |
| CN103925072A (en) * | 2014-04-12 | 2014-07-16 | 哈尔滨工程大学 | EGR (exhaust gas recirculation) and intake humidification based supercharged diesel engine environment protection device |
| CN104074636A (en) * | 2013-12-23 | 2014-10-01 | 哈尔滨工程大学 | Diesel engine EGR (Exhaust Gas Recirculation) system having humidification effect |
| CN104500191A (en) * | 2014-11-22 | 2015-04-08 | 白子榆 | Pipeline wrapping system |
| CN104564436A (en) * | 2014-11-22 | 2015-04-29 | 白子榆 | Exhaust gas recycle utilization system |
| CN108661825A (en) * | 2018-06-26 | 2018-10-16 | 胡清萍 | Internal combustion engine oil-water mixed combustion apparatus |
-
2003
- 2003-02-27 CN CN 03115551 patent/CN1212474C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419240C (en) * | 2004-03-31 | 2008-09-17 | 五十铃自动车株式会社 | Diesel engine |
| CN101175915B (en) * | 2005-05-18 | 2010-05-19 | 斯堪尼亚有限公司 | Arrangement for recirculation of exhaust gases of a supercharged internal combustion engine |
| CN101338698B (en) * | 2007-07-02 | 2010-08-04 | 曼狄赛尔公司 | Humid air diesel motor |
| WO2014079219A1 (en) * | 2012-11-26 | 2014-05-30 | Tian Jiaming | Supercharged engine |
| CN104074636A (en) * | 2013-12-23 | 2014-10-01 | 哈尔滨工程大学 | Diesel engine EGR (Exhaust Gas Recirculation) system having humidification effect |
| CN103925072A (en) * | 2014-04-12 | 2014-07-16 | 哈尔滨工程大学 | EGR (exhaust gas recirculation) and intake humidification based supercharged diesel engine environment protection device |
| CN104500191A (en) * | 2014-11-22 | 2015-04-08 | 白子榆 | Pipeline wrapping system |
| CN104564436A (en) * | 2014-11-22 | 2015-04-29 | 白子榆 | Exhaust gas recycle utilization system |
| CN108661825A (en) * | 2018-06-26 | 2018-10-16 | 胡清萍 | Internal combustion engine oil-water mixed combustion apparatus |
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| Publication number | Publication date |
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| CN1212474C (en) | 2005-07-27 |
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