CN114233465A - Ammonia fuel combustion system, engine and combustion control method - Google Patents

Ammonia fuel combustion system, engine and combustion control method Download PDF

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Publication number
CN114233465A
CN114233465A CN202111530462.0A CN202111530462A CN114233465A CN 114233465 A CN114233465 A CN 114233465A CN 202111530462 A CN202111530462 A CN 202111530462A CN 114233465 A CN114233465 A CN 114233465A
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CN
China
Prior art keywords
combustion chamber
combustion
fuel
ammonia
piston
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Pending
Application number
CN202111530462.0A
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Chinese (zh)
Inventor
尧命发
杨瑞
郑尊清
王浒
刘海峰
岳宗宇
王潜龙
王洁明
李刚
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Tianjin University
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Tianjin University
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Publication date
Application filed by Tianjin University filed Critical Tianjin University
Priority to CN202111530462.0A priority Critical patent/CN114233465A/en
Publication of CN114233465A publication Critical patent/CN114233465A/en
Pending legal-status Critical Current

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    • 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
    • F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
    • F02B19/1019—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber
    • F02B19/108—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber
    • 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
    • F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
    • F02B19/1019—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber
    • F02B19/108—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber
    • F02B19/1085—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber controlling fuel injection
    • 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
    • F02B19/14—Engines characterised by precombustion chambers with compression 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
    • F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
    • F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

The invention relates to the technical field of internal combustion engines, and provides an ammonia fuel combustion system, which comprises: a body; a piston installed in the body; the cylinder cover is arranged at the opening position of the machine body, and the cylinder cover, the machine body and the piston define a first combustion chamber; a first combustion section comprising: the first injector is arranged in the middle of the cylinder cover and used for injecting ammonia fuel into the first combustion chamber; a second combustion section including: the second combustion chamber is formed in the cylinder cover, is communicated with the first combustion chamber and is used for igniting fuel before the first combustion chamber; a second injector disposed within the second combustion chamber for injecting fuel into the second combustion chamber; and the jet hole is formed on the surface of the cylinder cover on the same side as the piston and used for leading fuel combusted in the second combustion chamber into jet flame and leading the jet flame into the first combustion chamber. The disclosure also provides a corresponding ammonia-fueled engine and a combustion control method.

Description

Ammonia fuel combustion system, engine and combustion control method
Technical Field
The invention relates to the technical field of internal combustion engines, in particular to an ammonia fuel combustion system, an engine and a combustion control method.
Background
The ammonia fuel is clean energy and can effectively solve the problem of carbon emission caused by the combustion process.
However, the ammonia fuel has high ignition temperature, large ignition energy, slow flame propagation speed and narrow flammability limit, so that the ammonia fuel is not easy to ignite and burn, and has poor combustion performance and stability. Therefore, the compression self-ignition mode needs a very high compression ratio, the compression ignition combustion of the pure ammonia fuel can have the difficult problems of poor combustion stability and even misfire under a small load working condition, and meanwhile, the compression ratio of the engine is too high, and the running stability and reliability are poor.
The application of ammonia fuel in internal combustion engines is mainly based on premixed ignition or dual-fuel combustion (such as diesel/ammonia dual fuel). The premixing ignition mode has the problems of low combustion efficiency, poor combustion stability and the like; and the dual-fuel mode still needs a large amount of diesel oil for ignition, so the effect of reducing carbon emission is poor.
Disclosure of Invention
In view of the above technical problems, the present invention provides an ammonia fuel combustion system, an engine and a combustion control method, which are used to at least partially solve the above technical problems.
One aspect of the present disclosure provides an ammonia-fueled combustion system including a housing; a piston installed in the body; the cylinder cover is arranged at the opening position of the machine body, and the cylinder cover, the machine body and the piston define a first combustion chamber; a first combustion section comprising: the first injector is arranged in the middle of the cylinder cover and used for injecting ammonia fuel into the first combustion chamber; a second combustion section including: a second combustion chamber formed in said cylinder head and communicating with said first combustion chamber for igniting fuel prior to said first combustion chamber; a second injector disposed within the second combustion chamber for injecting fuel into the second combustion chamber such that fuel injected from the second injector combusts under pressure prior to the ammonia fuel in the first combustion chamber; and the jet hole is formed on the surface of the cylinder cover on the same side as the piston and is used for forming jet flame by the fuel combusted in the second combustion chamber and introducing the jet flame into the first combustion chamber, so that the ammonia fuel in the first combustion chamber is combusted in a diffusion combustion mode.
According to an embodiment of the present disclosure, further comprising: an air inlet passage formed on the cylinder head; the exhaust passage is formed on the other radial side of the cylinder cover which is symmetrical to the air inlet passage; an intake valve is mounted in the air inlet channel and can be opened and closed; an exhaust valve is arranged in the exhaust passage in an openable and closable manner.
According to an embodiment of the disclosure, the first injector extends into the first combustion chamber in an axial direction of the cylinder head.
According to the embodiment of the disclosure, a plurality of spray holes are formed in the first end, located in the first combustion chamber, of the first injector in the axial direction at equal intervals in the circumferential direction.
According to the embodiment of the disclosure, a groove is formed on the surface of the piston on the same side as the cylinder cover, the surface of the groove is smooth, and the ammonia fuel injected from the injection hole of the first injector forms a vortex group through the surface of the groove.
Yet another aspect of the present disclosure provides an ammonia-fueled engine including an ammonia-fueled combustion system; a monitoring unit adapted to monitor the position of the piston; and a control unit adapted to controlling the injection time of the first injector and/or the second injector as a function of the position of the piston.
Another aspect of the present disclosure also provides a combustion control method, including: monitoring a position of a piston of an ammonia-fueled engine; controlling the oil injection time of the second injector according to the position of the piston; and controlling the injection timing of the first injector according to the state of the second combustion chamber.
According to an embodiment of the present disclosure, monitoring a position of a piston of an ammonia fueled engine includes obtaining the position of the piston based on an angle of a corresponding crank angle of a crankshaft associated with the piston during one cycle of operation of the piston.
According to an embodiment of the present disclosure, controlling the timing of injection of the second injector based on the position of the piston includes the second injector injecting fuel during a period of time in which the piston is approaching top dead center during one working cycle of the piston.
According to an embodiment of the present disclosure, controlling the injection timing of the first injector according to the state of the second combustion chamber includes forming a jet flame in the first combustion chamber after the fuel in the second combustion chamber is ignited, when the first injector injects the ammonia fuel.
The utility model provides an ammonia fuel combustion system forms first combustion chamber through organism, piston and cylinder cap cooperation, sets up first combustion portion and second combustion portion in the cylinder cap respectively. The first combustion part is used for inputting ammonia fuel into the first combustion chamber, the second combustion part is used for pre-burning a part of fuel, and the ammonia fuel in the first combustion chamber is ignited by jet flow flame formed by the pre-burned fuel.
The present disclosure further provides an ammonia fuel engine, which has the advantages of the ammonia fuel combustion system, and controls the fuel injection time based on the position and the state of the piston through the cooperation of the monitoring unit and the control unit, and the opening and closing of the valve is used for compression ignition of the fuel in the second combustion chamber, and then ignition of the ammonia fuel in the first combustion chamber.
The present disclosure also provides a combustion control method for an ammonia fuel engine to achieve the design goal of more stable and higher combustion efficiency of ammonia fuel in the combustion process.
Drawings
FIG. 1 is a schematic cross-sectional view of an ammonia-fueled combustion system in accordance with an exemplary embodiment of the present disclosure;
FIG. 2 is a cross-sectional schematic view of another angle of the illustrative embodiment shown in FIG. 1;
FIG. 3 is a state diagram of a fuel injection state of the combustion system of the exemplary embodiment shown in FIG. 1;
FIG. 4 is a bottom view of the head portion of the exemplary embodiment shown in FIG. 1;
FIG. 5 is a schematic block diagram of an ammonia fueled engine in accordance with an exemplary embodiment of the present disclosure; and
FIG. 6 is a flow chart of a method of combustion control for an ammonia fueled engine according to the present disclosure.
Reference numerals
1. A piston;
2. a body;
3. a cylinder cover;
4. a first combustion chamber;
5. spraying a hole;
6. a first ejector;
7. an injector end cap;
8. a second combustion chamber;
9. a second ejector;
10. a jet hole;
11. an air inlet channel;
12. an intake valve;
13. an exhaust valve; and
14. and (4) an exhaust passage.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
Where a convention analogous to "at least one of A, B and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B and C" would include but not be limited to systems that have a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.). Where a convention analogous to "A, B or at least one of C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B or C" would include but not be limited to systems that have a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.).
FIG. 1 is a schematic cross-sectional view of an ammonia-fueled combustion system in accordance with an exemplary embodiment of the present disclosure; FIG. 2 is a cross-sectional schematic view of another angle of the illustrative embodiment shown in FIG. 1; FIG. 3 is a state diagram of a fuel injection state of the combustion system of the exemplary embodiment shown in FIG. 1; FIG. 4 is a bottom view of the head portion of the exemplary embodiment shown in FIG. 1; FIG. 5 is a schematic block diagram of an ammonia fueled engine in accordance with an exemplary embodiment of the present disclosure; FIG. 6 is a flow chart of a method of combustion control for an ammonia fueled engine according to the present disclosure. .
The present disclosure provides an ammonia fuel combustion system, as shown in fig. 1 to 4, comprising: a machine body 2; a piston 1 installed in the body 2; and a cylinder head 3 mounted in an open position of the body 2, the piston 1 and the cylinder head 3 defining a first combustion chamber 4, and further including a first combustion portion and a second combustion portion. The first combustion part comprises a first injector 6 arranged in the middle of the cylinder head 3; the second combustion portion includes a second combustion chamber 8 formed in the cylinder head 3 and communicating with the first combustion chamber 4, a second injector 9 provided in the second combustion chamber 8, and a jet hole 10 formed in the surface of the cylinder head 3 on the same side as the piston 1. Wherein the first injector 6 is used to inject ammonia fuel into the first combustion chamber 4; the second combustion chamber 8 is used to pilot the fuel prior to the first combustion chamber 4 so that the fuel injected from the second injector 9 combusts under pressure prior to the fuel in the first combustion chamber 4; the second injector 9 is used for injecting fuel into the second combustion chamber 8, and the jet hole 10 is used for forming jet flame from the fuel combusted in the second combustion chamber 8 and introducing the jet flame into the first combustion chamber 4, igniting ammonia fuel fog beam formed by the ammonia fuel in the first combustion chamber 4, and enabling the ammonia fuel in the first combustion chamber 4 to be combusted in a diffusion combustion mode.
In detail, the second combustion section employs a highly active fuel, wherein the highly active fuel is characterized as a fuel that is easily combustible compared to ammonia fuel, and further, preferably, is easily compression-ignited under the pressure and temperature environment of the second combustion chamber.
Further, the first combustion part adopts ammonia fuel, and forms a fuel fog beam for being ignited by the jet flame formed by the second combustion part. The fuel mist is not limited to the type of fuel, and the fuel may include a gaseous state or a supercritical fluid state in addition to a liquid state.
Further, the second combustion section includes, but is not limited to, the above-described form, which requires the arrangement of the corresponding second injector 9 and the arrangement of the second combustion chamber 8 and the first combustion chamber 4 in one space. The highly reactive fuel injected by the second injector 9 combusts prior to the ammonia fuel in the first combustion chamber 4 and forms a jet flame pilot fuel.
According to the embodiment of the present disclosure, the combustion apparatus further includes an intake passage 11 formed in the cylinder head 3, and an exhaust passage 14 disposed on the cylinder head 3 symmetrically to the intake passage 11. An intake valve 12 is provided in the intake port 11 to be openable and closable, and an exhaust valve 13 is provided in the exhaust port 14 to be openable and closable.
According to an embodiment of the present disclosure, the first injector 6 extends into said first combustion chamber 4 in the axial direction of the cylinder head 3.
According to the embodiment of the disclosure, as shown in fig. 3 and 4, a plurality of injection holes 5 are formed at the first axial end of the first injector 6 in the first combustion chamber 4 at equal intervals in the circumferential direction.
Specifically, the number of the injection holes 5 is six to eight, and the six injection holes 5 are uniformly spaced in the circumferential direction.
In detail, the first injector 6 is fixed to the end cover by an injector end cover 7.
Further, the number of injection holes 5 may be designed according to the actual fuel injection demand and flow rate. It should be understood that embodiments of the present disclosure are not limited thereto.
For example, the number of the injection holes 5 is other number.
Further, the position of the injection hole 5 may also be designed according to the type of fuel and the relative position with the second combustion portion.
In detail, the lower end portion of the second combustion chamber 8 is located inside the first combustion chamber 4.
Further, the second combustion chamber 8 is an offset second combustion chamber with respect to the first combustion chamber 4.
Furthermore, each of the plurality of jet holes 10 formed in the second combustion chamber 8 may be individually designed according to actual requirements, for example, the position, number and parameters (including but not limited to angle, aperture and length) of the jet hole 10, so as to satisfy the requirement that the jet flame can be formed by the second combustion chamber 8 and the jet flame can effectively ignite the fuel in the first combustion chamber 4.
For example, the number of the jet holes 10 coincides with the number of the nozzle holes 5 of the first combustor 6. The jet flame formed by the jet hole 10 partially overlaps with the path of the fuel ejected from the nozzle hole 5.
For example, the number of the jet holes 10 does not coincide with the number of the nozzle holes 5 of the first combustor 6.
For example, the downward inclination angle of the jet hole 10 near the first injector 6 is smaller than that of the jet hole 10 on the other side, so that the jet flames from both sides can contact with the corresponding ammonia fuel mist and effectively ignite, thereby improving the ignition effect of the flame jet on the fuel in the first combustion chamber 4. It should be understood that embodiments of the present disclosure are not limited thereto.
For example, the angles and positions of the respective jet holes 10 coincide.
For example, the speed of the fuel ejected from the jet hole 10 is controlled by the overall design of parameters such as the length, the hole diameter, and the angle of the jet hole 10.
According to the embodiment of the present disclosure, a line formed by the first combustion portion and the second combustion portion and a line formed by the intake passage 11 and the exhaust passage 14 are perpendicular to each other in a plane formed by the radial direction of the cylinder head 3. So that the second combustion part forms an offset design relative to the first combustion part, which is beneficial to realizing the design purpose of igniting the first combustion part by the second combustion part by designing the parameters of the jet hole 5 and the jet hole 10.
According to the embodiment of the present disclosure, a groove is formed on the surface of the piston 1 on the same side as the cylinder head 3, the surface of the groove is smoothly arranged, and fuel injected from the injection hole 5 of the first injector forms a vortex mass through the surface of the groove.
In detail, the same side surfaces of the piston and the cylinder cover form a groove, and the bottom of the groove is smoothly provided with round transition.
Furthermore, the middle part of the groove and the orthographic projection position of the first combustion part form a convex part, and the convex part and the groove bottom of the groove are integrally formed. So that the fuel injected into the groove is stopped by the groove bottom of the groove and extends to the radial outside along the groove bottom to form a vortex group. It should be understood that embodiments of the present disclosure are not limited thereto.
For example, the shape of the groove should be designed according to the position of the first combustion portion and the position of the injection hole 5 formed by the first injector 6.
Also, since the piston 1 is moved along the body 2, the shape of the groove should also be designed according to the position of the piston 1 relative to the body 2.
For example, the shape of the groove should be such that, when the piston 1 is moving up to a certain position, what kind of vortices can be formed in the groove by the fuel injected by the first injector 6 as a design objective.
There is also provided in accordance with another aspect of the present disclosure an ammonia-fueled engine, as shown in fig. 6, including an ammonia-fueled combustion system, a monitoring unit, and a control unit. Wherein the monitoring unit is adapted to monitoring the position of the piston 1 and the control unit is adapted to controlling the injection time of the first injector 6 and/or said second injector 9 depending on the position of the piston 1.
In detail, the control unit also controls the opening and closing of the intake valve 12 and/or the exhaust valve 13.
According to another aspect of the present disclosure, there is also provided a combustion control method of an ammonia-fueled engine, as shown in fig. 6, including: monitoring the position of a piston 1 of an ammonia-fueled engine; the injection timing of the second injector 9 is controlled according to the position of the piston 1; and controlling the injection timing of the first injector 6 according to the state of the second combustion chamber 8.
According to an embodiment of the present disclosure, monitoring the position of the piston 1 of the ammonia-fueled engine includes obtaining the position of the piston 1 from an angle of a corresponding crank angle of a crankshaft associated with the piston 1 during one cycle of operation of the piston 1.
According to an embodiment of the present disclosure, controlling the timing of the injection of the fuel by the second injector 9 according to the position of the piston 1 includes the second injector 9 injecting the fuel during the approach of the piston 1 to the top dead center in one working cycle of the piston 1.
According to an embodiment of the present disclosure, controlling the timing of the injection of the first injector 6 according to the state of the second combustion chamber 8 includes forming a jet flame in the first combustion chamber 4 after the fuel in the second combustion chamber 8 is ignited, while the first injector 6 injects the ammonia fuel.
In detail, the piston 1 firstly descends from the top dead center, when the intake valve 12 is opened, the exhaust valve 13 is in a closed state, and fresh air enters the first combustion chamber 4 and the second combustion chamber 8 through the intake passage 11; when the piston 1 passes through the bottom dead center, the air inlet valve 12 is closed, and the piston 1 moves upwards to compress air in the cylinder, so that the temperature and the pressure of the air are continuously increased; when the piston 1 moves to a position close to the top dead center, the second injector 9 starts to inject high-activity fuel, the high-activity combustion is ignited and combusted under the action of high temperature and high pressure, the temperature and the pressure in the second combustion chamber 8 are increased rapidly due to the heat release of the fuel combustion, so that the pressure difference between the second combustion chamber 8 and the first combustion chamber 4 is increased gradually, and the combustion flame in the second combustion chamber 8 is sprayed out from the jet hole 10 under the action of the pressure difference to form jet flame; at the same time, the first injector 6 also starts to inject ammonia fuel, and due to the higher injection pressure, the ammonia fuel spray will be injected to the edge of the first combustion chamber 4, so that the jet flame can ignite the combustible mixture at the end of the spray; after the combustible mixed gas at the spray tail end of the first combustion chamber is ignited, diffusion combustion flame is formed, and a large amount of heat is released by fuel combustion to push the piston 1 to move downwards and output mechanical work; when the piston 1 moves to a position close to the bottom dead center, the exhaust valve 13 is opened, and the piston 1 moves upwards to remove waste gas in the combustion chamber, so that the whole working process is completed.
According to the ammonia fuel combustion system, the ammonia fuel engine and the combustion control method of the ammonia fuel engine provided by the disclosure, 1, the jet flame generated by the combustion of the high-activity fuel in the second combustion chamber is utilized to ignite the ammonia fuel in the first combustion chamber, so that the ammonia fuel can realize diffusion combustion, and the diffusion combustion has high efficiency. 2. The ignition effect of the jet flame can obviously improve the ignition and combustion stability of the ammonia fuel under the working condition of small load. 3. The fuel quantity entering the first combustion chamber and/or the second combustion chamber can be adjusted according to the real-time change of the load, so that the stable combustion of the combustion system under the full working condition can be effectively improved. And then make the fuel quantity that increases the second combustion chamber under the light load condition, strengthen the pilot action of efflux flame, the stability of comparatively effectual promotion burning, under the heavy load condition, optimize the injection strategy of fuel, comparatively effectual prevention burning is too rough.
The embodiments of the present disclosure have been described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although the embodiments are described separately above, this does not mean that the measures in the embodiments cannot be used in advantageous combination. The scope of the disclosure is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the present disclosure, and such alternatives and modifications are intended to be within the scope of the present disclosure.

Claims (10)

1. An ammonia-fueled combustion system comprising:
a body (2);
a piston (1) mounted within the body (2);
a cylinder head (3) mounted in an open position of the body (2), the cylinder head (3), the body (2) and the piston (1) defining a first combustion chamber (4);
a first combustion section comprising:
a first injector (6) arranged in the middle of the cylinder head (3) for injecting ammonia fuel into the first combustion chamber (4);
a second combustion section including:
a second combustion chamber (8) formed in said cylinder head (3) and communicating with said first combustion chamber (4) for igniting fuel prior to said first combustion chamber (4);
a second injector (9) disposed in the second combustion chamber (8) for injecting fuel into the second combustion chamber (8) such that the fuel injected from the second injector combusts under pressure prior to the ammonia fuel in the first combustion chamber; and
and the jet hole (10) is formed on the surface of the cylinder cover (3) facing the piston (1) and is used for forming jet flame from the fuel combusted in the second combustion chamber (8) and introducing the jet flame into the first combustion chamber (4), igniting the ammonia fuel in the first combustion chamber (4) and enabling the ammonia fuel in the first combustion chamber (4) to be combusted in a diffusion combustion mode.
2. The ammonia-fueled combustion system according to claim 1, further comprising:
an intake duct (11) formed in the cylinder head (3); and
an exhaust passage (14) formed on the other radial side of the cylinder head (3) that is symmetrical to the intake passage (11);
wherein an inlet valve (12) is mounted in the air inlet channel (11) in an openable and closable manner; an exhaust valve (13) is mounted in the exhaust passage (14) in an openable and closable manner.
3. The ammonia-fueled combustion system according to any one of claim 1, wherein the first injector (6) extends into the first combustion chamber (4) in an axial direction of the cylinder head (3).
4. The ammonia-fueled combustion system according to claim 3, wherein an end of the first injector (6) in the first combustion chamber (4) is circumferentially evenly spaced with a plurality of injection holes (5).
5. The ammonia fuel combustion system according to claim 4, wherein a groove is formed on the surface of the piston (1) and the cylinder head (3) on the same side, the surface of the groove is smoothly arranged, and the ammonia fuel injected from the injection hole (5) of the first injector (6) forms a vortex group through the surface of the groove.
6. An ammonia-fueled engine comprising:
the ammonia-fueled combustion system according to any one of claims 1 to 6;
a monitoring unit adapted to monitor the position of the piston (1); and
-a control unit adapted to controlling the injection time of the first injector (6) and/or the second injector (9) depending on the position of the piston (1).
7. A combustion control method of an ammonia-fueled engine, comprising:
monitoring the position of a piston (1) of an ammonia-fueled engine;
controlling the injection timing of a second injector (9) according to the position of the piston (1); and
the injection timing of the first injector (6) is controlled in accordance with the state of the second combustion chamber (8).
8. The combustion control method as claimed in claim 7, wherein monitoring the position of a piston (1) of an ammonia-fueled engine comprises obtaining the position of the piston (1) from an angle of a corresponding crank angle of a crankshaft associated with the piston (1) in one working cycle of the piston (1).
9. The combustion control method as defined in claim 8, wherein controlling injection timing of a second injector (9) in accordance with the position of the piston (1) includes the second injector (9) injecting fuel during a period in which the piston (1) approaches top dead center in one working cycle of the piston (1).
10. The combustion control method as claimed in claim 9, wherein controlling the timing of injection of the first injector (6) in accordance with the state of the second combustion chamber (8) includes forming a jet flame in the first combustion chamber (4) after the fuel in the second combustion chamber (8) is ignited while the first injector (6) injects ammonia fuel.
CN202111530462.0A 2021-12-14 2021-12-14 Ammonia fuel combustion system, engine and combustion control method Pending CN114233465A (en)

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CN202111530462.0A CN114233465A (en) 2021-12-14 2021-12-14 Ammonia fuel combustion system, engine and combustion control method

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2023194188A1 (en) * 2022-04-04 2023-10-12 Green AP GmbH Internal combustion engine, in particular for a motor vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023194188A1 (en) * 2022-04-04 2023-10-12 Green AP GmbH Internal combustion engine, in particular for a motor vehicle

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