CN111997792A - Turbulent jet ignition combustion system - Google Patents
Turbulent jet ignition combustion system Download PDFInfo
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- CN111997792A CN111997792A CN202010901179.3A CN202010901179A CN111997792A CN 111997792 A CN111997792 A CN 111997792A CN 202010901179 A CN202010901179 A CN 202010901179A CN 111997792 A CN111997792 A CN 111997792A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 56
- 239000000446 fuel Substances 0.000 claims abstract description 26
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 238000002407 reforming Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 6
- 230000003197 catalytic effect Effects 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 7
- 230000008021 deposition Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 47
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 230000033228 biological regulation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001833 catalytic reforming Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 230000001737 promoting effect Effects 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0227—Means to treat or clean gaseous fuels or fuel systems, e.g. removal of tar, cracking, reforming or enriching
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/12—Engines characterised by precombustion chambers with positive ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/16—Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B19/00—Engines characterised by precombustion chambers
- F02B19/16—Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10
- F02B19/18—Transfer passages between chamber and cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
- F02M21/0224—Secondary gaseous fuel storages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0281—Adapters, sockets or the like to mount injection valves onto engines; Fuel guiding passages between injectors and the air intake system or the combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0287—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers characterised by the transition from liquid to gaseous phase ; Injection in liquid phase; Cooling and low temperature storage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0293—Safety devices; Fail-safe measures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/30—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel reformer
-
- 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
-
- 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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The present disclosure provides a turbulent jet ignition combustion system comprising: a reformer, an intercooler, a reformed gas storage unit, and a precombustion chamber; the reformer is sleeved on the engine exhaust pipe, and the reformer reforms a mixed gas obtained by mixing gaseous fuel and air by utilizing high-temperature preheating of the engine exhaust pipe; the intercooler is connected with the reformer through a pipeline; the reformed gas storage unit is connected with the intercooler through a pipeline; and the gas injection valve of the pre-combustion chamber is connected with the reformed gas storage unit through a pipeline. The method has the advantages that the reformate is introduced into the precombustion chamber for ignition and combustion, so that the problems of wall collision and carbon deposition caused by spray of the precombustion chamber can be effectively avoided, and the problem of difficulty in cold start is solved.
Description
Technical Field
The disclosure relates to the field of internal combustion power devices, and particularly relates to a turbulent jet ignition combustion system.
Background
In recent years, conventional engines are continually challenged by fuel consumption regulations, emission regulations and new energy development. Engines will remain the primary source of motive power for automobiles for the next decades. Spark-ignition engines (such as gasoline engines and gas engines) are widely used power engines at present. The ignition type engine adopts the traditional combustion mode of single-point ignition of the spark plug and flame propagation, the thermal efficiency is relatively low, and the future higher effective thermal efficiency is the main attack direction of the ignition type engine.
For a spark ignition engine, accelerating the combustion speed, advancing the combustion center, and realizing the constant volume combustion of 'slow combustion before rapid combustion' are the keys for improving the combustion efficiency and the thermal efficiency. Jet ignition in the precombustion chamber can obviously improve turbulent kinetic energy in a cylinder and realize rapid and stable combustion, and the loss of pumping, heat transfer and combustion can be greatly reduced after the technology of Miller circulation, large EGR, lean combustion and the like is further matched. The active precombustion chamber is provided with an auxiliary fuel supply system, fuel or oil-gas mixture is sprayed into the precombustion chamber, waste gas is forcibly discharged out of the precombustion chamber, stable combustion can be realized under the conditions of large EGR rate and lean combustion, and the effects of large-load detonation suppression and small-load combustion stability are obvious. However, the volume of the precombustion chamber is 1-3% of the volume of the main combustion chamber; in a narrow space, the oil beam seriously collides the wall, so that oil-gas mixing is influenced, and overhigh HC emission and carbon deposition are caused. Meanwhile, the wall surface is over-cooled during cold start, flame is easy to quench, unburned hydrocarbon and oil consumption performance are poor, and low-temperature cold start is difficult.
Disclosure of Invention
Technical problem to be solved
The present disclosure provides a turbulent jet ignition combustion system to at least partially solve the technical problems set forth above.
(II) technical scheme
According to one aspect of the present disclosure, there is provided a turbulent jet ignition combustion system comprising:
the reformer is sleeved on the engine exhaust pipe and reforms a mixed gas obtained by mixing gaseous fuel and air by utilizing high-temperature preheating of the engine exhaust pipe;
the intercooler is connected with the reformer through a pipeline;
the reformed gas storage unit is connected with the intercooler through a pipeline;
and the gas injection valve of the pre-combustion chamber is connected with the reformed gas storage unit through a pipeline.
In some embodiments of the present disclosure, the engine block is coupled to the prechamber.
In some embodiments of the present disclosure, the reformer comprises:
an oil injector;
the microchannel tubular reforming unit is sleeved on the engine exhaust pipe; the fuel injector inputs liquid fuel into the micro-channel tubular reforming unit to be converted into gaseous fuel.
In some embodiments of the present disclosure, the microchannel tubular reforming unit has a catalytic layer disposed on an inner surface thereof.
In some embodiments of the present disclosure, the microchannel tubular reforming unit is provided with an insulating layer on an outer surface thereof.
In some embodiments of the present disclosure, the precombustor includes:
a spark plug disposed at an inlet end of the pre-chamber; the spark plug and the jet valve are arranged at the same end of the pre-combustion chamber;
a nozzle orifice disposed at an outlet end of the prechamber.
In some embodiments of the present disclosure, a diameter of the middle portion of the nozzle hole gradually increases toward diameters of both ends of the nozzle hole, and the nozzle hole is tapered-tapered.
In some embodiments of the present disclosure, the diameter of the nozzle holes of the precombustion chamber is less than 1.0-1.5 mm, and the number of the nozzle holes is less than 6-10.
In some embodiments of the present disclosure, further comprising:
the electromagnetic valve is arranged on a pipeline of the gas injection valve of the pre-combustion chamber, which is connected with the reformed gas storage unit;
the pressure relief valve is arranged in the reformed gas storage unit;
a control unit connected to the reformer, the pre-chamber and an engine, the control unit controlling reforming of the reformer and injection of the pre-chamber; the control unit controls the opening and closing of the electromagnetic valve according to the received rotating speed and load operation requirements of the engine so as to introduce a fixed amount of reformed mixed gas into the precombustion chamber; and when the pressure value in the reformed gas storage unit exceeds the critical pressure, the control unit controls the pressure relief valve to open.
In some embodiments of the present disclosure, the pre-chamber is selected to be a tapered combustion chamber.
(III) advantageous effects
As can be seen from the above technical solutions, the turbulent jet ignition combustion system of the present disclosure has at least one or a part of the following beneficial effects:
(1) the reformate is introduced into the precombustion chamber for ignition and combustion, so that the problems of wall collision and carbon deposition caused by spray in the precombustion chamber can be effectively avoided, and the problem of difficult cold start is solved.
(2) The fuel reforming utilizes the exhaust waste heat, improves the chemical quality of the fuel, and improves the combustion efficiency and the thermal efficiency of the engine.
(3) By catalytically reforming the liquid fuel, the fuel flammability limit range is widened.
Drawings
FIG. 1 is a schematic illustration of a turbulent jet ignition combustion system in accordance with an embodiment of the present disclosure.
FIG. 2 is a schematic diagram of a reformer and an engine exhaust pipe according to an embodiment of the disclosure.
Fig. 3 is a schematic cross-sectional structure of fig. 2.
FIG. 4 is a cross-sectional structural schematic view of a precombustor according to an embodiment of the disclosure.
Fig. 5 is a partially enlarged view of a in fig. 4.
[ description of main reference numerals in the drawings ] of the embodiments of the present disclosure
1-an engine exhaust pipe;
2-a reformer;
3-a spark plug;
4-an air injection valve;
5-pipeline;
6-electromagnetic valve;
7-a pipeline;
8-a precombustion chamber;
9-spraying holes.
Detailed Description
The present disclosure provides a turbulent jet ignition combustion system comprising: a reformer, an intercooler, a reformed gas storage unit, and a precombustion chamber; the reformer is sleeved on the engine exhaust pipe, and the reformer reforms a mixed gas obtained by mixing gaseous fuel and air by using high-temperature waste heat of the engine exhaust pipe; the intercooler is connected with the reformer through a pipeline; the reformed gas storage unit is connected with the intercooler through a pipeline; and the gas injection valve of the pre-combustion chamber is connected with the reformed gas storage unit through a pipeline. The method has the advantages that the reformate is introduced into the precombustion chamber for ignition and combustion, so that the problems of wall collision and carbon deposition caused by spray of the precombustion chamber can be effectively avoided, and the problem of difficulty in cold start is solved.
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
Certain embodiments of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the disclosure are shown. Indeed, various embodiments of the disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.
In a first exemplary embodiment of the present disclosure, a turbulent jet-ignited combustion system is provided. FIG. 1 is a schematic illustration of a turbulent jet ignition combustion system in accordance with an embodiment of the present disclosure. As shown in fig. 1, the disclosed turbulent jet ignition combustion system comprises: a reformer 2, an intercooler, a reformed gas storage unit, and a precombustion chamber 8; the reformer 2 is sleeved on the engine exhaust pipe 1, and the reformer 2 reforms a mixed gas obtained by mixing gaseous fuel and air by utilizing high-temperature preheating of the engine exhaust pipe 1; the intercooler is connected with the reformer 2 through a pipeline, and the reformed mixed gas (reformed gas) is input into the intercooler; the reformed gas storage unit is connected with the intercooler through a pipeline 7, and the reformed gas passing through the intercooler is introduced into the reformed gas storage unit for storage; the gas injection valve 4 of the precombustion chamber 8 is connected with a reformed gas storage unit through a pipeline 5, and a certain amount of reformed gas is introduced into the precombustion chamber 8 from the reformed gas storage system through a pipeline 7 for conveying the reformed gas according to the running requirements of different rotating speeds and loads of the engine.
Aiming at the problems in the background technology, the method utilizes the high-temperature exhaust waste heat of the engine to carry out catalytic reforming on the liquid fuel, and leads the reformed product containing a large amount of gaseous products such as hydrogen peroxide, hydrogen, methane and the like into the precombustion chamber 8 for ignition and combustion after pressurization and intercooling, thereby effectively avoiding the problems of wall collision and carbon deposition caused by spray of the precombustion chamber 8.
The reformer 2 includes: a fuel injector and a microchannel tubular reforming unit. The micro-channel tubular reforming unit is sleeved on the engine exhaust pipe 1, as shown in fig. 2 and 3, a fuel injector inputs liquid fuel into the micro-channel tubular reforming unit, and the liquid fuel is converted into gaseous fuel through the high-temperature action of the exhaust pipe. The inner surface of the microchannel tubular reforming unit is provided with a catalytic layer, and the catalytic layer can be made of Pt, CZO and Al2O3One or more of the above. The outer surface of the microchannel tubular reforming unit is provided with a heat insulation layer.
As shown in fig. 4, the precombustor 8 includes: a gas injection valve 4, a solenoid valve 6, a spark plug 3 and a nozzle hole 9.
A spark plug 3 is arranged at the inlet end of said pre-chamber 8; the spark plug 3 and the jet valve 4 are arranged at the same end of the prechamber 8; an orifice 9 is provided at the outlet end of the prechamber 8. The aperture of the middle part of the spray hole 9 is gradually increased towards the apertures of the two ends of the spray hole 9, and the spray hole 9 is in a tapered-divergent type, so that the continuous acceleration of flame to the supersonic speed level can be realized, as shown in fig. 5. The diameter of the jet holes 9 of the precombustion chamber 8 is less than 1mm, and the number of the jet holes 9 is less than 8. An electromagnetic valve 6 is arranged on a pipeline 7 of the gas injection valve 4 of the precombustion chamber 8 connected with the reformed gas storage unit, and a control unit controls the opening and closing of the electromagnetic valve 6 according to the requirements of receiving the rotating speed and load operation of the engine so as to introduce a fixed amount of reformed mixed gas into the precombustion chamber 8. The prechamber 8 is chosen as a tapered combustion chamber, which accelerates the initial flame propagation.
And the pressure relief valve is arranged in the reformed gas storage unit, and the control unit controls the pressure relief valve to open when the pressure value in the reformed gas storage unit exceeds the critical pressure.
The reformed gas storage unit is internally distributed with the porous medium material, so that the mixed gas can be prevented from layering, meanwhile, the mixed gas can be prevented from being ignited accidentally, and the reformed gas storage unit is safe and efficient.
The present disclosure calibrates and matches the reformer 2 reforming strategy and prechamber 8 reformate injection strategy to the control unit by the control unit interfacing with the reformer 2, prechamber 8, and engine block. Before the intake stroke of the engine, the control unit controls the electromagnetic valve 6 on the pipeline 5 for transporting combustible mixed gas to be closed, the electromagnetic valve 6 on the pipeline 7 for transporting reformed gas to be opened, and quantitative reformed gas is introduced into the precombustion chamber 8 according to the running requirements of the engine on different rotating speeds and loads. And then the air inlet stroke begins, the control unit controls the electromagnetic valve 6 on the pipeline 7 for transporting the reformed gas to be closed, the pipeline 5 for transporting the combustible mixed gas is opened, and a large amount of gaseous products such as hydrogen peroxide, hydrogen, methane and the like in the reformed product are mixed with fuel spray to be combusted, so that the fuel spray is reduced from hitting the wall, the lean combustion ignition performance of the engine is effectively improved, and the problem of carbon deposition is solved.
When the pressure in the reformed gas storage unit exceeds a critical limit (e.g., accidental combustion occurs), a pressure relief valve mounted externally to the reformed gas storage unit operates to prevent the pressure from exceeding the critical limit.
Before the engine is ignited, the control unit controls the electromagnetic valve 6 on the pipeline 7 for transporting the reformed gas to be opened, and the reformed product with the preset volume is introduced into the precombustion chamber 8 to enhance the reaction activity and facilitate ignition, so that the problems of easy quenching of flame, poor unburned hydrocarbon and oil consumption performance and difficult low-temperature cold start in cold start are solved.
So far, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. Further, the above definitions of the various elements and methods are not limited to the various specific structures, shapes or arrangements of parts mentioned in the examples, which may be easily modified or substituted by those of ordinary skill in the art.
From the above description, those skilled in the art should have a clear understanding of the turbulent jet ignition combustion system of the present disclosure.
In conclusion, the present disclosure provides a method for introducing reformate into a precombustion chamber for ignition and combustion, which can effectively avoid the problems of wall collision and carbon deposition caused by spray in the precombustion chamber, and solve the problem of difficulty in cold start.
It should also be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present disclosure. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present disclosure.
And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Unless otherwise indicated, the numerical parameters set forth in the specification and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". Generally, the expression is meant to encompass variations of ± 10% in some embodiments, 5% in some embodiments, 1% in some embodiments, 0.5% in some embodiments by the specified amount.
Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (10)
1. A turbulent jet ignition combustion system comprising:
the reformer is sleeved on the engine exhaust pipe and reforms a mixed gas obtained by mixing gaseous fuel and air by utilizing high-temperature preheating of the engine exhaust pipe;
the intercooler is connected with the reformer through a pipeline;
the reformed gas storage unit is connected with the intercooler through a pipeline;
and the gas injection valve of the pre-combustion chamber is connected with the reformed gas storage unit through a pipeline.
2. The turbulent jet ignition combustion system of claim 1, wherein the engine block is associated with the pre-chamber.
3. The turbulent jet ignition combustion system of claim 1, wherein the reformer comprises:
an oil injector;
the microchannel tubular reforming unit is sleeved on the engine exhaust pipe; the fuel injector inputs liquid fuel into the micro-channel tubular reforming unit to be converted into gaseous fuel.
4. The turbulent jet ignition combustion system of claim 1, wherein a catalytic layer is disposed on an inner surface of the microchannel tubular reforming unit.
5. The turbulent jet ignition combustion system of claim 1, wherein the microchannel tubular reforming unit outer surface is provided with a layer of insulating insulation.
6. The turbulent jet ignition combustion system of claim 1, wherein the pre-chamber comprises:
a spark plug disposed at an inlet end of the pre-chamber; the spark plug and the jet valve are arranged at the same end of the pre-combustion chamber;
a nozzle orifice disposed at an outlet end of the prechamber.
7. The turbulent jet ignition combustion system of claim 6, wherein the diameter of the hole in the middle of the hole gradually increases towards the diameter of the holes at both ends of the hole, and the hole is tapered-tapered.
8. The turbulent jet ignition combustion system of claim 6, wherein the diameter of the orifices of the pre-chamber is less than 1.0-1.5 mm, and the number of orifices is less than 6-10.
9. The turbulent jet ignition combustion system of claim 1, further comprising:
the electromagnetic valve is arranged on a pipeline of the gas injection valve of the pre-combustion chamber, which is connected with the reformed gas storage unit;
the pressure relief valve is arranged in the reformed gas storage unit;
a control unit connected to the reformer, the pre-chamber and an engine, the control unit controlling reforming of the reformer and injection of the pre-chamber; the control unit controls the opening and closing of the electromagnetic valve according to the received rotating speed and load operation requirements of the engine so as to introduce a fixed amount of reformed mixed gas into the precombustion chamber; and when the pressure value in the reformed gas storage unit exceeds the critical pressure, the control unit controls the pressure relief valve to open.
10. The turbulent jet ignition combustion system of claim 1, wherein the pre-chamber is selected to be a tapered combustion chamber.
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| CN113685262A (en) * | 2021-08-18 | 2021-11-23 | 天津大学 | Gasoline engine ignition mechanism comprising supersonic jet orifice precombustion chamber |
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