CN209942968U - High-efficient clean combustion diesel engine - Google Patents
High-efficient clean combustion diesel engine Download PDFInfo
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- CN209942968U CN209942968U CN201920146205.9U CN201920146205U CN209942968U CN 209942968 U CN209942968 U CN 209942968U CN 201920146205 U CN201920146205 U CN 201920146205U CN 209942968 U CN209942968 U CN 209942968U
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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
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Abstract
The utility model discloses a high-efficiency clean combustion diesel engine, which comprises a diesel engine body, wherein the diesel engine body is connected with an air inlet channel and an air outlet channel, an air inlet supercharging intercooler is arranged on the air inlet channel, and the diesel engine body is provided with a water spraying system, an oil spraying system, a supercharging system, a high-pressure EGR system and a low-pressure EGR system; the water spraying system comprises a water sprayer, a water supply pipeline and a water supply device; the fuel injection system comprises a fuel injector, a fuel supply pipeline and a fuel supply device; a waste gas inlet of the pressurization system is connected with the exhaust passage, a waste gas outlet is connected with a waste gas discharge pipeline, an air inlet is connected with an air filter, and an air outlet is connected with an air inlet passage; the high-pressure EGR system comprises a high-pressure exhaust gas recirculation valve, a high-pressure exhaust gas recirculation cooler, a second check valve and an air inlet throttle valve; the low-pressure EGR system comprises an exhaust back-pressure valve, a low-pressure exhaust gas recirculation valve, a particulate trap, a low-pressure exhaust gas recirculation cooler and a one-way valve.
Description
Technical Field
The utility model relates to an internal-combustion engine field, more specifically say so, relate to a high-efficient clean combustion diesel engine.
Background
Internal combustion engines have evolved over the last hundred years to become the primary mobile power unit for human use and continue to occupy an important position for a long period of time in the future. The internal combustion engine heats the heating working medium by burning the energy of the released fuel, thereby pushing the piston to do work. The air participating in combustion contains N2Under a high-temperature oxidizing atmosphere, N2Will take part in the reaction to produce NOxAnd the environmental problems such as acid rain, photochemical pollution and the like can be caused when the water is discharged into the atmosphere through an engine. Meanwhile, the diesel combustion mode is in-cylinder direct injection diffusion combustion, and PM is generated in this combustion mode. PM is harmful to human health, reduces atmospheric visibility, and gives people a sense of uneasiness and smallnessPM with the particle size of 10 μm is easy to be inhaled by human bodies, causes harm to respiratory systems, and causes diseases such as asthma, and meanwhile, the PM also contains various carcinogenic substances such as benzopyrene.
In response to the emission problems of internal combustion engines, countries around the world have successively introduced a series of emission regulations, the limits of which tend to be near zero. In order to meet the emission regulations, engine manufacturers meet the emission regulations by combining means of internal purification and external purification, but the external purification has low conversion efficiency, cannot solve the emission problem by only relying on post-treatment, and has high cost, so the emission of the original engine is required to be controlled at a low level. The effective control means of NOx emission of the existing engine mainly comprises modes of delaying oil injection time, post-processing, EGR, water injection and the like. The fuel economy is reduced by delaying the fuel injection time, and the use cost of the engine is improved; there are two difficulties in solving the emission problem through post-treatment: one is that the post-treatment cost is high, and commercialization is difficult to realize; the other is that the aftertreatment has limited efficiency, it is difficult to reduce emissions to near zero emissions, and the DPF used to solve the soot emissions problem has an active regeneration problem.
Low temperature combustion via EGR can achieve both NOx and root emissions below emission limits, but low temperature combustion results in reduced combustion efficiency, extended combustion duration, and reduced thermal efficiency of the engine. The main reason is that the inert gases in the exhaust gas reduce the combustion rate, while the introduction into the cylinder results in a reduction in the oxygen concentration of the in-cylinder combustion. Meanwhile, the introduction of a large amount of exhaust gas on a multi-cylinder engine is also a difficult problem, and the common high-pressure EGR cannot introduce enough exhaust gas at low speed and high load and cannot reduce the emission to the limit value; low pressure EGR introduces exhaust gas in the intake line, but components in the exhaust gas can corrode the compressor, thereby reducing engine reliability.
The water injection combustion of the engine is adopted in the industry for the first time, and a water injector is added in an air inlet channel of a gasoline engine by German BMW company, so that the problem of combustion knocking tendency of the gasoline engine in the combustion process is solved as water enters a cylinder and the air inlet temperature is correspondingly reduced, the compression ratio of the gasoline engine can be improved to the same level as that of the diesel engine, and the fuel economy of the gasoline engine is improved by about 13%.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming not enough among the prior art, provide a high-efficient clean combustion diesel engine, can reduce cylinder wall heat transfer capacity, reduce the pump gas work loss, improve the diesel engine thermal efficiency, realize at the full operating mode scope that ultralow NOx discharges.
The purpose of the utility model is realized through the following technical scheme.
The utility model discloses a high-efficient clean combustion diesel engine, including the diesel engine body, the diesel engine body is connected with intake duct and exhaust passage, be provided with the pressure boost intercooler that admits air on the intake duct, the diesel engine body is provided with water injection system, oil spout system, pressure boost system, high pressure EGR system, low pressure EGR system;
the water spraying system comprises water sprayers, a water supply pipeline and a water supply device, wherein each air inlet manifold of the diesel engine body is provided with the water sprayer, each water sprayer is connected with the water supply device through the water supply pipeline, and each water sprayer is electrically connected with the engine control unit;
the fuel injection system comprises a fuel injector, a fuel supply pipeline and a fuel supply device, wherein a fuel injector is arranged in each cylinder of the diesel engine body, each fuel injector is connected with the fuel supply device through the fuel supply pipeline, and each fuel injector is electrically connected with the engine control unit;
the waste gas inlet of the pressurization system is connected with the exhaust passage, the waste gas outlet of the pressurization system is connected with a waste gas discharge pipeline, the air inlet of the pressurization system is connected with an air filter through a pipeline, and the air outlet of the pressurization system is connected with the air inlet passage;
the high-pressure EGR system comprises a high-pressure exhaust gas recirculation valve, a high-pressure exhaust gas recirculation cooler, a second check valve and an air inlet throttle valve, wherein the high-pressure exhaust gas recirculation valve, the high-pressure exhaust gas recirculation cooler and the second check valve are sequentially arranged on a high-pressure EGR loop along the air flowing direction, and the high-pressure EGR loop is connected between an air inlet channel and an air outlet channel; the air inlet throttle valve is arranged on an air inlet channel which is arranged at the intersection of the high-pressure EGR loop and the air inlet channel and is close to the air outlet of the air inlet supercharging intercooler;
the low pressure EGR system includes exhaust back pressure valve, low pressure exhaust gas recirculation valve, particle trap, low pressure exhaust gas recirculation cooler and check valve No. one, exhaust back pressure valve sets up on exhaust emission pipeline, low pressure exhaust gas recirculation valve, particle trap, low pressure exhaust gas recirculation cooler, check valve set gradually on the low pressure EGR return circuit along the gas flow direction, the low pressure EGR return circuit is connected between turbocharging system's exhaust outlet and air intlet.
The form of the supercharging system includes, but is not limited to, single-stage supercharging or two-stage supercharging or mechanical supercharging; the supercharging system comprises a turbine and a gas compressor, the turbine and the gas compressor are in rigid connection, the turbine is respectively connected with an exhaust passage and a waste gas discharge pipeline, and the gas compressor is respectively connected with an air inlet passage and an air filter.
Compared with the prior art, the utility model discloses a beneficial effect that technical scheme brought is:
(1) the utility model adopts the air inlet channel water spraying system which has less structural change to the diesel engine and low cost; the low-temperature combustion realized by water spraying can reduce the heat transfer quantity of the cylinder wall and improve the heat efficiency of the diesel engine.
(2) The utility model discloses a nimble control EGR rate of high, low pressure EGR system can reduce the pump qigong loss, has the potentiality of increasing the heat efficiency.
(3) The utility model discloses well EGR combines the water spray to realize realizing the low temperature burning more easily, can widen the working range of clean burning, realizes at the full operating mode scope that ultralow NOx discharges.
(4) In the working area of part of the diesel engine, the low-temperature combustion is realized only by using the water injection system, the dependence on an EGR system is reduced, and the reliability of the diesel engine can be improved.
Drawings
Figure 1 is a schematic diagram of the high efficiency clean burning diesel engine of the present invention.
Reference numerals: 1 exhaust back pressure valve, 2 low-pressure exhaust gas recirculation valve, 3 particle trap, 4 low-pressure exhaust gas recirculation cooler, 5 one-way valve, 6 fuel supply pipeline, 7 supercharging system, 701 turbine, 702 compressor, 8 oil supply device, 9 air filter, 10 water supply device, 11 water supply pipeline, 12 high-pressure exhaust gas recirculation valve, 13 high-pressure exhaust gas recirculation cooler, 14 two-way valve, 15 air inlet supercharging intercooler, 16 air inlet throttle valve, 17 diesel engine body, 18 air inlet channel, 19 water sprayer, 20 engine control unit, 21 oil sprayer, 22 exhaust passage, A exhaust gas inlet, B exhaust gas outlet, C air outlet and D air inlet.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments, which are only illustrative of the present invention and are not intended to limit the present invention.
When the traditional diesel engine realizes low-temperature combustion by introducing waste gas, the oxygen content in a cylinder of the engine is reduced, so that the combustion efficiency is reduced, the combustion rate is slowed down, the combustion duration is prolonged, and the fuel economy is reduced. By adding the water spraying device in the air inlet channel, the sprayed water is in a fog state, the reduction of the fresh air intake amount is avoided, the total heat capacity of working media in the cylinder can be improved, the combustion temperature in the cylinder is reduced, and the heat transfer loss in the cylinder is reduced, so that the efficient combustion is realized; meanwhile, the reduction of the in-cylinder combustion temperature is beneficial to reducing the formation of NOx, and the oxygen concentration of in-cylinder combustion is kept unchanged, so that the emission of PM can be reduced, and the compromise relationship existing between NOx and soot emission can be broken. Combine water spray and EGR to realize the low temperature burning more easily, when can realizing ultralow emission, improve the thermal efficiency of engine, and can effectively widen the working range of high-efficient clean burning, the utility model discloses it is exactly such device that can obtain above effect to provide.
As shown in fig. 1, the utility model discloses high-efficient clean combustion diesel engine, including diesel engine body 17, diesel engine body 17 is connected with intake duct 18 and exhaust passage 22, be provided with the pressure boost intercooler 15 that admits air on the intake duct 18. The diesel engine body 17 is provided with a water injection system, an oil injection system, a supercharging system 7, a high-pressure EGR system and a low-pressure EGR system.
The water injection system comprises a water injector 19, a water supply line 11 and a water supply 10. Each intake manifold of the diesel engine body 17 is provided with water sprayers 19, and the number of the water sprayers 19 is an integral multiple of the number of corresponding cylinders, namely, six water sprayers 19 are adopted by the six-cylinder engine. Each sprinkler 19 is connected to the water supply device 10 through a water supply line 11, and each sprinkler 19 is electrically connected to an engine control unit 20. The water supply 10 supplies high pressure water through the water supply line 11 to the water jets 19 in each intake manifold. The range of the pressure difference between the water spraying pressure and the pressure in the air inlet channel 18 is kept between 0.5MPa and 1MPa and is kept constant in the water spraying system, so that the water can be sprayed out from the water sprayer 19 in a mist state to be mixed with the air in the air inlet channel 18, and the control of the water spraying amount is guaranteed. The amount of water injection is controlled by the engine control unit 20, and the engine control unit 20 sends a periodic pulse signal to the water injector 19, and when the water injection pressure is kept constant, the amount of water injection is determined by the duration of the pulse. At this time, the operation of the water sprayer 19 should control the water sprayer 19 to spray water in the intake stroke of the corresponding cylinder in conjunction with the phase of the crank angle to prevent water from being agglomerated on the pipe.
The fuel injection system comprises a fuel injector 21, a fuel supply line 6 and a fuel supply device 8. An oil injector 21 is arranged in each cylinder of the diesel engine body 17, each oil injector 21 is connected with the oil supply device 8 through the fuel supply pipeline 6, and each oil injector 21 is electrically connected with the engine control unit 20. The oil supply 8 supplies high-pressure oil to the injectors 21 of each cylinder via the fuel supply line 6. The pressure in the oil path is kept between 80MPa and 300MPa, and the atomization effect of oil injection in the cylinder is ensured. The control of the injection is controlled by the engine control unit 20 in conjunction with the phasing of the crank angle of the oil burner.
The waste gas inlet A of the pressurization system 7 is connected with the exhaust passage 22, the waste gas outlet B of the pressurization system 7 is connected with a waste gas discharge pipeline, the air inlet D of the pressurization system 7 is connected with the air filter 9 through a pipeline, and the air outlet C of the pressurization system 7 is connected with the air inlet passage 18. The form of the supercharging system 7 includes, but is not limited to, single-stage supercharging, two-stage supercharging, mechanical supercharging, etc. (two-stage supercharging is shown). The supercharging system 7 comprises a turbine 701 and a compressor 702, the turbine 701 and the compressor 702 are rigidly connected, the turbine 701 is respectively connected with an exhaust passage 22 and an exhaust gas discharge pipeline, and the compressor 702 is respectively connected with an air inlet passage 18 and an air filter 9. The exhaust gas enters the turbine 701 of the supercharging system 7 from the exhaust passage 22 to drive the turbine 701 to rotate, the turbine 701 is rigidly connected with the compressor 702, so that the compressor 702 is pushed, the fresh air entering the compressor 702 from the air filter 9 is supercharged, the fresh air enters the intake supercharging intercooler 15 after being supercharged, and the fresh air enters the intake passage 18 after being cooled to provide supercharged air for the diesel engine.
The high-pressure EGR system comprises a high-pressure exhaust gas recirculation valve 12, a high-pressure exhaust gas recirculation cooler 13, a check valve 14 and an air inlet throttle valve 16, wherein the high-pressure exhaust gas recirculation valve 12, the high-pressure exhaust gas recirculation cooler 13 and the check valve 14 are sequentially arranged on a high-pressure EGR loop along the air flow direction, and the high-pressure EGR loop is connected between an air inlet passage 18 and an exhaust passage 22. The air inlet throttle valve 16 is arranged on an air inlet passage 18 which is close to an air outlet of the air inlet supercharging intercooler 15 and is intersected with the air inlet passage 18 of the high-pressure EGR loop. The exhaust gas flows through a high-pressure exhaust gas recirculation valve 12, a high-pressure exhaust gas recirculation cooler 13 and a second check valve 14 through a high-pressure EGR loop, wherein the high-pressure exhaust gas recirculation valve 12 controls the introduction amount of the exhaust gas by controlling the opening degree of the valve; the high-pressure exhaust gas recirculation cooler 13 cools the exhaust gas to prevent the intake air temperature from being too high and reduce the inflation coefficient of the diesel engine; the second check valve 14 is used to prevent the gas in the inlet passage 18 from flowing back into the outlet passage 22. When the pressure in the intake passage 18 and the pressure difference in front of the turbine 701 of the supercharging system 7 cannot provide a sufficient pressure difference to ensure the EGR rate, the opening degree of the intake throttle valve 16 is reduced to increase the pressure difference between the front of the turbine and the intake passage 18, so that the exhaust gas can enter the intake passage 18 from the exhaust passage 22.
The low pressure EGR system includes exhaust back pressure valve 1, low pressure exhaust gas recirculation valve 2, particulate trap 3, low pressure exhaust gas recirculation cooler 4 and check valve 5 No. one, exhaust back pressure valve 1 sets up on exhaust-gas discharge pipeline, low pressure exhaust gas recirculation valve 2, particulate trap 3, low pressure exhaust gas recirculation cooler 4, check valve 5 set gradually on the low pressure EGR return circuit along the gas flow direction, the low pressure EGR return circuit is connected between supercharging system 7's exhaust outlet B and air intlet D. After the exhaust gas comes out of a turbine 701 of a supercharging system 7, a low-pressure exhaust gas recirculation valve 2 is opened, particles of the exhaust gas are removed through a particle trap 3 to prevent damage to a compressor 702, and the exhaust gas enters a low-pressure exhaust gas recirculation cooler 4 to be cooled, then enters a pipeline behind an air filter 9 through a one-way valve 5, and is mixed with fresh air to enter the compressor 702 of the supercharging system 7. When the supplied low-pressure EGR rate is insufficient, the opening degree of the exhaust back-pressure valve 1 may be reduced to increase the exhaust back-pressure, increasing the low-pressure EGR rate.
The composition of the gas in the intake passage 18 includes air from the atmospheric environment, exhaust gas from the high pressure EGR system, exhaust gas from the low pressure EGR system, wherein the composition includes at least air from the atmospheric environment, and the remaining two are alternatives.
The design and selection of the sprinkler 19 to be used is accomplished by those skilled in the art using conventional methods; the control strategies under different working conditions can be realized by the technical personnel in the technical field by adopting conventional means; and will not be described in detail herein.
Although the present invention has been described in connection with the exemplary embodiments, the present invention is not limited to the specific embodiments, which have been described above, and the above description is only illustrative and not restrictive. Those skilled in the art who have the benefit of this disclosure can also make various modifications (e.g., the engine can be non-supercharged, single-stage supercharged, or two-stage supercharged, mechanical supercharged, and the air passage water sprayer can be a single water sprayer or the position of the water sprayer can be changed) without departing from the spirit of this invention, which falls within the scope of this invention.
Claims (2)
1. A high-efficiency clean combustion diesel engine comprises a diesel engine body (17), wherein the diesel engine body (17) is connected with an air inlet channel (18) and an air outlet channel (22), and an air inlet supercharging intercooler (15) is arranged on the air inlet channel (18), and is characterized in that the diesel engine body (17) is provided with a water spraying system, an oil spraying system, a supercharging system (7), a high-pressure EGR system and a low-pressure EGR system;
the water spraying system comprises water sprayers (19), a water supply pipeline (11) and a water supply device (10), wherein each air inlet manifold of the diesel engine body (17) is provided with the water sprayer (19), each water sprayer (19) is connected with the water supply device (10) through the water supply pipeline (11), and each water sprayer (19) is electrically connected with an engine control unit (20);
the fuel injection system comprises a fuel injector (21), a fuel supply pipeline (6) and a fuel supply device (8), wherein a fuel injector (21) is arranged in each cylinder of the diesel engine body (17), each fuel injector (21) is connected with the fuel supply device (8) through the fuel supply pipeline (6), and each fuel injector (21) is electrically connected with an engine control unit (20);
a waste gas inlet (A) of the pressurization system (7) is connected with the exhaust passage (22), a waste gas outlet (B) of the pressurization system (7) is connected with a waste gas discharge pipeline, an air inlet (D) of the pressurization system (7) is connected with an air filter (9) through a pipeline, and an air outlet (C) of the pressurization system (7) is connected with an air inlet passage (18);
the high-pressure EGR system comprises a high-pressure exhaust gas recirculation valve (12), a high-pressure exhaust gas recirculation cooler (13), a second check valve (14) and an air inlet throttle valve (16), wherein the high-pressure exhaust gas recirculation valve (12), the high-pressure exhaust gas recirculation cooler (13) and the second check valve (14) are sequentially arranged on a high-pressure EGR loop along the air flowing direction, and the high-pressure EGR loop is connected between an air inlet passage (18) and an exhaust passage (22); the air inlet throttle valve (16) is arranged on the air inlet channel (18) which is arranged at the intersection of the high-pressure EGR loop and the air inlet channel (18) and is close to the air outlet of the air inlet supercharging intercooler (15);
the low-pressure EGR system comprises an exhaust back-pressure valve (1), a low-pressure exhaust gas recirculation valve (2), a particle trap (3), a low-pressure exhaust gas recirculation cooler (4) and a check valve (5), wherein the exhaust back-pressure valve (1) is arranged on an exhaust emission pipeline, the low-pressure exhaust gas recirculation valve (2), the particle trap (3), the low-pressure exhaust gas recirculation cooler (4) and the check valve (5) are sequentially arranged on a low-pressure EGR loop along the gas flowing direction, and the low-pressure EGR loop is connected between an exhaust gas outlet (B) and an air inlet (D) of a supercharging system (7).
2. A clean-burning diesel engine with high efficiency according to claim 1, characterized in that said supercharging system (7) is in the form of, but not limited to, a single-stage supercharging or a two-stage supercharging or a mechanical supercharging; the supercharging system comprises a turbine (701) and a compressor (702), wherein the turbine (701) and the compressor (702) are in rigid connection, the turbine (701) is respectively connected with an exhaust passage (22) and an exhaust gas discharge pipeline, and the compressor (702) is respectively connected with an air inlet passage (18) and an air filter (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920146205.9U CN209942968U (en) | 2019-01-28 | 2019-01-28 | High-efficient clean combustion diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920146205.9U CN209942968U (en) | 2019-01-28 | 2019-01-28 | High-efficient clean combustion diesel engine |
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| CN209942968U true CN209942968U (en) | 2020-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611242A (en) * | 2019-01-28 | 2019-04-12 | 天津大学 | A kind of high-efficiency cleaning burning diesel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611242A (en) * | 2019-01-28 | 2019-04-12 | 天津大学 | A kind of high-efficiency cleaning burning diesel |
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