CN112855335A - Independent air inlet pre-combustion chamber of large-cylinder-diameter low-calorific-value gas internal combustion engine and use method - Google Patents

Independent air inlet pre-combustion chamber of large-cylinder-diameter low-calorific-value gas internal combustion engine and use method Download PDF

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CN112855335A
CN112855335A CN202110234517.7A CN202110234517A CN112855335A CN 112855335 A CN112855335 A CN 112855335A CN 202110234517 A CN202110234517 A CN 202110234517A CN 112855335 A CN112855335 A CN 112855335A
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gas
chamber
combustion chamber
internal combustion
combustion engine
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马晓钟
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Shandong University of Technology
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Shandong University of Technology
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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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • 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 an independent air inlet pre-combustion chamber of a large-cylinder-diameter low-calorific-value gas internal combustion engine and a using method thereof. The technical scheme is as follows: the upper part of the precombustion chamber is connected with the bottom of the middle body, and the upper end of the middle body is connected with the upper body; the lower part of the pre-combustion chamber is provided with a flame nozzle, the bottom of the flame nozzle is uniformly provided with a plurality of fire holes which are matched with the main combustion chamber and have an angle larger than 90 degrees, and the inner cavity of the flame nozzle is provided with a large check ball and a large ball screen plug; the inner cavity of the middle body is provided with a spark plug mounting hole and a second premixed gas channel, the bottom of the second premixed gas channel is provided with a small check ball and a small ball screen plug, and a spark plug is mounted in the spark plug mounting hole. The beneficial effects are that: the ignition is reliable, the combustion speed is improved, the exhaust temperature is reduced, the backfire blasting of the air inlet pipe is avoided, and the power generation efficiency of the gas engine is improved; strong ignition energy can reliably ignite the lean premixed gas in the main combustion chamber, and the NOx emission is reduced; saves high-quality fuel and reduces the operating cost.

Description

Independent air inlet pre-combustion chamber of large-cylinder-diameter low-calorific-value gas internal combustion engine and use method
Technical Field
The invention relates to a low-calorific-value gas utilization technology, in particular to an independent air inlet pre-combustion chamber of a large-cylinder-diameter low-calorific-value gas internal combustion engine and a using method thereof.
Background
At present, China has some low-quality fuel gases with the heat value of 750-3000 kcal and complicated and variable combustible components, such as low-concentration coal mine gas, low-concentration methane, oil shale gas, acetylene gas, straw gas, smelting tail gas and the like, and the quantity of the fuel gases is at least 500 hundred million m per year3Equivalent total amount of natural gas. These low-grade fuel gases are difficult to use directly as industrial and domestic fuels, but can be used as fuel for internal combustion engines to generate electricity. But using these low heatsThere are problems with the use of value fuels for internal combustion engine power generation: firstly, because the content of inert gas in the gas is high, the ignition is difficult and the after-burning phenomenon is serious, the exhaust temperature of the internal combustion engine is high, the service life of a valve is short, and the gas is fed back and blown out; second, the exhaust emission of internal combustion engine exceeds standard, NOXEmission of 500mg/m3Above, the difficulty of exhaust gas post-treatment increases. These problems are more pronounced in large bore internal combustion engines.
Aiming at the problems, relevant scientific research institutes and research and development enterprises at home and abroad use the following two modes of precombustion technology to improve ignition energy, ensure ignition feasibility and accelerate combustion speed: one is a premixed gas precombustion chamber technology which enters from a main combustion chamber and has the same quality with the main combustion chamber; the other technology is a technology of independently feeding premixed gas with higher concentration than the premixed gas in the main combustion chamber into the precombustion chamber as the fuel of the precombustion chamber by adopting an independent mechanism. Both methods, while effective, are not ideal and sometimes suffer from engine starting difficulties and misfire problems. Therefore, some low-calorific-value fuel gas at home and abroad is still not well utilized, which wastes energy and pollutes the atmospheric environment.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides an independent air inlet precombustion chamber of a large-cylinder-diameter low-calorific-value gas internal combustion engine and a using method thereof, so that low-calorific-value gas can be safely, reliably, environmentally and energy-saving to be used as the internal combustion engine for power generation.
The invention provides an independent air inlet pre-combustion chamber of a large-cylinder-diameter low-calorific-value gas internal combustion engine, which adopts the technical scheme that: the device comprises an upper body (2), a middle body (4), small check balls (5), a small ball sieve plug (6), a precombustion chamber (7), a flame spray nozzle (8), large check balls (9) and a large ball sieve plug (10), wherein the upper part of the precombustion chamber (7) is arranged at the bottom of the middle body (4), and the upper end of the middle body (4) is connected with the upper body (2); a flame nozzle (8) is arranged at the lower part of the precombustion chamber (7), a plurality of flame holes (D) which are matched with the main combustion chamber and have an angle larger than 90 degrees are uniformly arranged at the bottom of the flame nozzle (8), and a large check ball (9) and a large ball sieve plug (10) are arranged in the inner cavity of the flame nozzle (8); the inner cavity of the middle body (4) is provided with a spark plug mounting hole (E) and a second premixed gas channel (C), the bottom of the second premixed gas channel (C) is provided with a small check ball (5) and a small ball screen plug (6), and a spark plug (a 9) is mounted in the spark plug mounting hole (E).
Preferably, foretell upper part of the body (2) is equipped with dense premix gas import (A) of precombustion chamber and first premix gas way (B), bolt hole, the lower extreme of first premix gas way (B) and second premix gas way (C) through sealed pad (3) intercommunication, the upper end and the dense premix gas import (A) of precombustion chamber intercommunication are equipped with a plurality of bolt holes in the outside of upper part of the body (2), connect fixedly through housing bolt (1).
Preferably, above-mentioned little check ball (5) and big check ball (9) are the clean shot that high temperature resistant corrosion-resistant material made, and wherein, little check ball (5) are used for preventing explosion flame and high-pressure high-temperature gas cluster in precombustion chamber (7), big check ball (9) are used for preventing main combustion chamber explosion flame and high-pressure high-temperature gas and main combustion chamber premix combustible gas compression cluster, guarantee the interior premix combustible gas quality of precombustion chamber.
Preferably, the large ball sieve plug (10) and the large check ball (9) are arranged in the flame nozzle (8) and are connected with the precombustion chamber (7) through threads, the small check ball (5) is arranged in the middle body (4) and then is screwed into the middle body (4) through threads, the small ball sieve plug (6) is locked, the precombustion chamber (7) which is assembled before is connected with the middle body (4) through threads, and the assembled components are fixed on a cylinder cover of the gas internal combustion engine through the sealing gasket (3) and the upper body (2) by the compression bolt (1).
Preferably, a valve spring group (a 5), a buffer spring (a 4) and a mechanical control rocker arm (a 3) are sequentially mounted at the upper end of a first premixed gas channel (B) of the upper body (2), an adjusting pressure head (a 2) and a locking nut (a 1) are arranged at the top of the mechanical control rocker arm (a 3), a valve guide pipe (a 6) and a valve (a 7) are arranged in an inner cavity of the first premixed gas channel (B), a valve seat ring (a 8) is arranged at the bottom of the valve (a 7), and the upper end of the valve (a 7) is mounted in the valve guide pipe (a 6).
Preferably, the spark plug (a 9) is a high-energy spark plug.
Preferably, the outer side of the richer premixed gas inlet (A) of the precombustion chamber is connected with an electric control valve (a 10).
The invention provides a use method of an independent air inlet pre-combustion chamber of a large-cylinder-diameter low-calorific-value gas internal combustion engine, which comprises the following steps of:
firstly, assembling a precombustion chamber: the pre-assembled pre-combustion chamber is pressed into a cylinder cover of the gas internal combustion engine through a compression bolt (1), and a spark plug is arranged in a middle body (4) and is connected with an ignition system of the gas internal combustion engine; connecting a pre-combustion chamber air inlet mechanism;
secondly, supplying gas to the precombustion chamber: synchronous with the air intake of the main combustion chamber, a gas internal combustion engine control mechanism starts a relatively dense premixed gas to enter the precombustion chamber (7), and discharges the waste gas formed in the precombustion chamber (7) in the last working cycle into the main combustion chamber, wherein the relatively dense premixed gas can be a mixture of gasoline and air formed by a carburetor, or a mixture of natural gas or petroleum liquefied gas and air;
thirdly, air supply compression of the precombustion chamber: in synchronization with the compression of the main combustion chamber, the piston of the gas internal combustion engine ascends to compress and intake air, the large check ball (9) ascends to close a channel for the lean premixed gas in the main combustion chamber to enter the precombustion chamber (7), and the small check ball (5) closes a channel for the denser premixed gas to enter;
fourthly, igniting the precombustion chamber: before the piston of the gas internal combustion engine reaches the top dead center, a spark plug ignites the thicker premixed gas in the pre-combustion chamber (7), explosion flame rushes open a large check ball (9), the flame passes through a large ball screen plug (10) and is sprayed into a main combustion chamber from a spray hole of a flame nozzle (8), and the compressed lean premixed gas in the main combustion chamber is ignited to do work;
fifthly, exhaust gas emission: the exhaust valve of the main combustion chamber of the gas internal combustion engine is opened, the piston moves upwards, high-temperature waste gas after work is done in the main combustion chamber is discharged, and a large check ball (9) moves upwards to closely block the waste gas in the main combustion chamber and enters a precombustion chamber (7) during the period;
and sixthly, working enters the next cycle: repeating the two to five steps.
Compared with the prior art, the invention has the following beneficial effects:
firstly, ignition is reliable, and the heat efficiency is improved: the mechanism ensures that the thicker premixed gas in the precombustion chamber is not interfered by the lean premixed gas and the waste gas in the main combustion chamber, the precombustion chamber reliably ignites and ignites the low-heat value lean premixed gas in the main combustion chamber, the combustion speed is improved, the exhaust temperature is reduced, the backfire blasting of an air inlet pipe is avoided, and the power generation efficiency of a gas engine is improved;
secondly, the main combustion chamber is in lean combustion, so that the tail gas denitration cost is reduced: strong ignition energy can reliably ignite the lean premixed gas in the main combustion chamber, and the NOx emission is reduced;
thirdly, saving high-quality fuel and reducing operating cost: the low-heat value lean premixed gas in the main combustion chamber is prevented from entering the precombustion chamber to dilute the high-heat value richer premixed gas in a large amount, the premixed gas concentration required by ignition of the precombustion chamber is ensured, and the excessive use of high-quality fuel is avoided;
fourthly, expanding the power generation market range of the gas internal combustion engine: as long as the calorific value of the fuel gas is more than 750kcal, the fuel gas can be used as the power generation fuel of the internal combustion engine after being purified.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of embodiment 2 of the present invention;
in the upper diagram: a compression bolt 1, an upper body 2, a sealing gasket 3, a middle body 4, a small check ball 5, a small ball plug 6, a precombustion chamber 7, a flame nozzle 8, a large check ball 9 and a large ball plug 10,
the device comprises a locking nut a1, an adjusting pressure head a2, a mechanical control rocker arm a3, a buffer spring a4, a valve spring group a5, a valve guide pipe a6, a valve a7, a valve seat ring a8, a spark plug a9 and an electric control valve a 10.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Embodiment 1, referring to fig. 1, the independent air intake precombustion chamber of the large-cylinder-diameter low-calorific-value gas internal combustion engine comprises an upper body 2, a middle body 4, a small check ball 5, a small ball plug 6, a precombustion chamber 7, a flame spray nozzle 8, a large check ball 9 and a large ball plug 10, wherein the bottom of the middle body 4 is arranged above the precombustion chamber 7, and the upper end of the middle body 4 is connected with the upper body 2; a flame nozzle 8 is arranged at the lower part of the precombustion chamber 7, a plurality of fire holes D which are matched with the main combustion chamber and have an angle larger than 90 degrees are uniformly arranged at the bottom of the flame nozzle 8, and a large check ball 9 and a large ball sieve plug 10 are arranged in the inner cavity of the flame nozzle 8; the inner cavity of the middle body 4 is provided with a spark plug mounting hole E and a second premixed gas channel C, the bottom of the second premixed gas channel C is provided with a small check ball 5 and a small ball screen plug 6, and a spark plug a9 is mounted in the spark plug mounting hole F.
Wherein, foretell upper part of the body 2 is equipped with dense premix gas import A of precombustion chamber and first premix gas way B, bolt hole, the lower extreme and the second of first premix gas way B premix gas way C through sealed 3 intercommunications, the upper end and the dense premix gas import A intercommunication of precombustion chamber, be equipped with a plurality of bolt holes in the outside of upper part of the body 2, connect fixedly through housing bolt 1.
In addition, above-mentioned little check ball 5 and big check ball 9 are the clean shot that high temperature resistant corrosion-resistant material made, and wherein, little check ball 5 is used for preventing to cluster on explosion flame and the high-pressure high-temperature gas in the antechamber 7, big check ball 9 is used for preventing to cluster on explosion flame and the high-pressure high-temperature gas in the main combustion chamber and the compression of the premixed combustible gas of main combustion chamber, guarantees to premix the combustible gas quality in the antechamber.
The large ball sieve plug 10 and the large check ball 9 are arranged in the flame nozzle 8 and are connected with the precombustion chamber 7 through threads, the small check ball 5 is arranged in the middle body 4 and then screwed into the middle body 4 through threads and locked, the precombustion chamber 7 which is assembled before is connected with the middle body 4 through threads, and the assembled components are fixed on a cylinder cover of the gas internal combustion engine through the sealing gasket 3 and the upper body 2 by the compression bolt 1.
The invention provides a use method of an independent air inlet pre-combustion chamber of a large-cylinder-diameter low-calorific-value gas internal combustion engine, which comprises the following steps of:
firstly, assembling a precombustion chamber: the pre-assembled pre-combustion chamber is pressed into a cylinder cover of the gas internal combustion engine through a compression bolt 1, and a spark plug is arranged in a middle body 4 and is connected with an ignition system of the gas internal combustion engine; is connected with the precombustion chamber air inlet mechanism.
Secondly, supplying gas to the precombustion chamber: synchronized with main combustion chamber intake. The control mechanism of the gas internal combustion engine starts the dense premixed gas to enter the precombustion chamber 7, and discharges the waste gas formed in the precombustion chamber 7 in the last working cycle into the main combustion chamber. The richer premixed gas may be a mixture of gasoline and air formed by a carburetor, or a mixture of natural gas or liquefied petroleum gas and air.
Thirdly, air supply compression of the precombustion chamber: in synchronism with the main combustion chamber entering compression. The piston of the gas internal combustion engine ascends to compress and intake air, the large check ball 9 ascends to close a passage for the lean premixed gas in the main combustion chamber to enter the precombustion chamber 7, and the small check ball 5 closes a passage for the richer premixed gas to enter.
Fourthly, igniting the precombustion chamber: before the piston of the gas internal combustion engine reaches the top dead center, the spark plug ignites the thicker premixed gas in the pre-combustion chamber 7, the explosion flame rushes the big check ball 9, the flame passes through the big ball screen plug 10 and is sprayed into the main combustion chamber from the spray hole of the flame spray nozzle 8, and the compressed thin premixed gas in the main combustion chamber is ignited to do work.
Fifthly, exhaust gas emission: the exhaust valve of the main combustion chamber of the gas internal combustion engine is opened, the piston moves upwards, high-temperature waste gas after work is done in the main combustion chamber is discharged, and the large check ball 9 moves upwards to tightly block the waste gas in the main combustion chamber to enter the precombustion chamber 7.
And sixthly, working enters the next cycle: repeating the two to five steps.
Embodiment 2, referring to fig. 2, the independent intake prechamber of a large-cylinder-diameter low-calorific-value gas internal combustion engine according to the present invention includes a locking nut a1, an adjusting pressure head a2, a mechanical control rocker arm a3, a buffer spring 4, a valve spring set 5, a valve guide 6, an upper body 2, a valve a7, a valve seat ring a8, a gasket 3, a middle body 4, a spark plug a9, a small check ball 5, a small ball plug 6, a prechamber 7, a burner 8, a large check ball 9, and a large ball plug 10, wherein the locking nut a1, the adjusting pressure head a2, and the mechanical control rocker arm a3 are connected together by a screw thread; after the valve seat ring a8 and the valve guide pipe are respectively pressed into the upper body 2, the valve a7 is arranged in the upper body 2, the valve spring group 5 is clamped with the valve a7, and the sealing gasket 3 is pressed into the upper body; the upper end of the buffer spring 4 is connected with a mechanical control rocker arm a3, and the lower end is connected with a valve spring group 5. The large ball sieve plug 10 is pressed into the flame nozzle 8, and the flame nozzle 8 is tightly connected with the precombustion chamber 7 by threads after the large check ball 9 is placed into the flame nozzle 8; the small check ball 5 is put into the middle body 4 and then is connected with the small ball sieve plug 6 and the middle body 4 in a threaded mode, the assembled precombustion chamber 7 is connected with the middle body 4 in a threaded mode, and then the spark plug a9 is screwed in the middle body 4 in a threaded mode. The upper body 2 is provided with a bolt hole, and the assembled middle body 4 is pressed on a cylinder cover of the gas internal combustion engine through the bolt.
The adjusting pressure head a2 can be adjusted up and down to ensure the proper opening lift of the valve a 7; the buffer spring 4 relieves hammering of the adjusting pressure head a2 on the upper end of the valve a 7. The valve a7 and the valve seat ring a8 are universal with a small gasoline engine, the stroke is short, and the air supply and the air stop of the precombustion chamber are rapid. The gasket 3 ensures the sealing between the air chamber of the valve a7 and the spark plug chamber of the middle body 4, and the precombustion chamber 7 uses gasoline as fuel.
Embodiment 3, referring to fig. 3, the invention provides an independent air intake precombustion chamber of a large-cylinder-diameter low-calorific-value gas internal combustion engine, which adopts the following technical scheme: the fuel gas burner comprises an upper body 2, an electric control valve a10, a middle body 4, a spark plug a9, a small check ball 5, a small ball sieve block 6, a precombustion chamber 7, a burner 8, a large check ball 9 and a large ball sieve block 10, wherein the connection relation of the middle body 4, the small check ball 5, the small ball sieve block 6, the precombustion chamber 7, the burner 8, the large check ball 9 and the large ball sieve block 10 is the same as that of the specific implementation mode, the electric control valve a10 is connected with a premixed gas channel on the upper body 2, and the spark plug a9 is fastened on the middle body 4 through threads.
The electric control valve a10 senses the air intake of the main combustion chamber and synchronously air intake with the main combustion chamber, the spark plug a9 is a high-energy spark plug, and the fuel used in the precombustion chamber 7 is natural gas or liquefied petroleum gas.
The above description is only a few of the preferred embodiments of the present invention, and any person skilled in the art may modify the above-described embodiments or modify them into equivalent ones. Therefore, the technical solution according to the present invention is subject to corresponding simple modifications or equivalent changes, as far as the scope of the present invention is claimed.

Claims (8)

1. The independent air inlet precombustion chamber of the large-cylinder-diameter low-calorific-value gas internal combustion engine is characterized in that: the device comprises an upper body (2), a middle body (4), small check balls (5), a small ball sieve plug (6), a precombustion chamber (7), a flame spray nozzle (8), large check balls (9) and a large ball sieve plug (10), wherein the upper part of the precombustion chamber (7) is arranged at the bottom of the middle body (4), and the upper end of the middle body (4) is connected with the upper body (2); a flame nozzle (8) is arranged at the lower part of the precombustion chamber (7), a plurality of flame holes (D) which are matched with the main combustion chamber and have an angle larger than 90 degrees are uniformly arranged at the bottom of the flame nozzle (8), and a large check ball (9) and a large ball sieve plug (10) are arranged in the inner cavity of the flame nozzle (8); the inner cavity of the middle body (4) is provided with a spark plug mounting hole (E) and a second premixed gas channel (C), the bottom of the second premixed gas channel (C) is provided with a small check ball (5) and a small ball screen plug (6), and a spark plug (a 9) is mounted in the spark plug mounting hole (E).
2. The independent intake pre-chamber of a large-bore low heating value gas internal combustion engine as set forth in claim 1, wherein: the upper part of the body (2) is provided with a pre-combustion chamber dense pre-mixed gas inlet (A), a first pre-mixed gas channel (B) and bolt holes, the lower end of the first pre-mixed gas channel (B) is communicated with a second pre-mixed gas channel (C) through a sealing gasket (3), the upper end of the first pre-mixed gas channel is communicated with the pre-combustion chamber dense pre-mixed gas inlet (A), the outer side of the upper part of the body (2) is provided with a plurality of bolt holes, and the first pre-mixed gas channel (B) and the bolt holes are fixedly connected through.
3. The independent intake pre-chamber of a large-bore low heating value gas internal combustion engine as set forth in claim 1, wherein: little check ball (5) and big check ball (9) are the clean shot that high temperature resistant corrosion-resistant material made, and wherein, little check ball (5) are used for preventing interior explosion flame of precombustion chamber (7) and high-pressure high-temperature gas from bunching up, big check ball (9) are used for preventing interior explosion flame of main combustion chamber and high-pressure high-temperature gas and main combustion chamber premix combustible gas compression from bunching up, guarantee the interior premix combustible gas quality of precombustion chamber.
4. The independent intake pre-chamber of a large-bore low heating value gas internal combustion engine as set forth in claim 1, wherein: the large ball sieve plug (10) and the large check ball (9) are arranged in the flame nozzle (8) and are connected with the precombustion chamber (7) through threads, the small check ball (5) is arranged in the middle body (4) and then is screwed into the middle body (4) through threads, the precombustion chamber (7) which is assembled before is connected with the middle body (4) through threads, and the assembled components are fixed on a cylinder cover of the gas internal combustion engine through the sealing gasket (3) and the upper body (2) by the compression bolt (1).
5. The independent intake pre-chamber of a large-bore low heating value gas internal combustion engine as set forth in claim 1, wherein: the upper end of a first premixing gas channel (B) of the upper body (2) is sequentially provided with a valve spring group (a 5), a buffer spring (a 4) and a mechanical control rocker arm (a 3), the top of the mechanical control rocker arm (a 3) is provided with an adjusting pressure head (a 2) and a locking nut (a 1), an inner cavity of the first premixing gas channel (B) is provided with a valve guide pipe (a 6) and a valve (a 7), the bottom of the valve (a 7) is provided with a valve seat ring (a 8), and the upper end of the valve (a 7) is arranged in the valve guide pipe (a 6).
6. The independent intake pre-chamber of a large-bore low heating value gas internal combustion engine as set forth in claim 1, wherein: the spark plug (a 9) adopts a high-energy spark plug.
7. The independent intake pre-chamber of a large-bore low heating value gas internal combustion engine as set forth in claim 1, wherein: the outer side of the pre-combustion chamber richer pre-mixed gas inlet (A) is connected with an electric control valve (a 10).
8. A method of using the independent intake pre-chamber of the large-cylinder low-heating-value gas internal combustion engine as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps:
firstly, assembling a precombustion chamber: the pre-assembled pre-combustion chamber is pressed into a cylinder cover of the gas internal combustion engine through a compression bolt (1), and a spark plug is arranged in a middle body (4) and is connected with an ignition system of the gas internal combustion engine; connecting a pre-combustion chamber air inlet mechanism;
secondly, supplying gas to the precombustion chamber: synchronous with the air intake of the main combustion chamber, a gas internal combustion engine control mechanism starts a relatively dense premixed gas to enter the precombustion chamber (7), and discharges the waste gas formed in the precombustion chamber (7) in the last working cycle into the main combustion chamber, wherein the relatively dense premixed gas can be a mixture of gasoline and air formed by a carburetor, or a mixture of natural gas or petroleum liquefied gas and air;
thirdly, air supply compression of the precombustion chamber: in synchronization with the compression of the main combustion chamber, the piston of the gas internal combustion engine ascends to compress and intake air, the large check ball (9) ascends to close a channel for the lean premixed gas in the main combustion chamber to enter the precombustion chamber (7), and the small check ball (5) closes a channel for the denser premixed gas to enter;
fourthly, igniting the precombustion chamber: before the piston of the gas internal combustion engine reaches the top dead center, a spark plug ignites the thicker premixed gas in the pre-combustion chamber (7), explosion flame rushes open a large check ball (9), the flame passes through a large ball screen plug (10) and is sprayed into a main combustion chamber from a spray hole of a flame nozzle (8), and the compressed lean premixed gas in the main combustion chamber is ignited to do work;
fifthly, exhaust gas emission: the exhaust valve of the main combustion chamber of the gas internal combustion engine is opened, the piston moves upwards, high-temperature waste gas after work is done in the main combustion chamber is discharged, and a large check ball (9) moves upwards to closely block the waste gas in the main combustion chamber and enters a precombustion chamber (7) during the period;
and sixthly, working enters the next cycle: repeating the two to five steps.
CN202110234517.7A 2021-03-03 2021-03-03 Independent air inlet pre-combustion chamber of large-cylinder-diameter low-calorific-value gas internal combustion engine and use method Withdrawn CN112855335A (en)

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CN202110234517.7A CN112855335A (en) 2021-03-03 2021-03-03 Independent air inlet pre-combustion chamber of large-cylinder-diameter low-calorific-value gas internal combustion engine and use method

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