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Marine large-bore natural gas engine precombustion chamber porous jet flow ignition type efficient combustion system

A technology of porous jet and combustion system, which is applied in the direction of gaseous engine fuel, fuel system, engine components, etc., to shorten the flame propagation distance, improve the turbulence intensity, and improve the combustion efficiency.

Pending Publication Date: 2019-01-11
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the above patents involves optimizing the matching of the intake system, pre-combustion chamber and combustion chamber structure, organizing reasonable airflow movement in the cylinder, achieving the purpose of improving the combustion speed of fuel in the cylinder and improving the thermal efficiency

Method used

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  • Marine large-bore natural gas engine precombustion chamber porous jet flow ignition type efficient combustion system
  • Marine large-bore natural gas engine precombustion chamber porous jet flow ignition type efficient combustion system
  • Marine large-bore natural gas engine precombustion chamber porous jet flow ignition type efficient combustion system

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Embodiment Construction

[0025] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0026] to combine Figure 1-5 , a marine large-bore natural gas engine pre-combustion chamber porous jet ignition high-efficiency combustion system, comprising an intake port 4, a natural gas supply device 5, an intake valve 6, an exhaust port 7, an exhaust valve 8, a pre-combustion Chamber 9, pre-chamber natural gas injection device 10, spark plug 11 and a main combustion chamber consisting of cylinder head 1, piston 2 and cylinder liner 3. There are two sets of natural gas supply devices, one set of natural gas supply device 5 is installed on the intake duct 4 for supplying lean gas to the main combustion chamber; Too rich gas is supplied. The intake port 4 is a spiral intake port. The structure of the spiral intake port allows the mixture of natural gas and air to flow around the central axis of the cylinder after entering the cylinder, forming a large-scale ...

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Abstract

The invention provides a marine large-bore natural gas engine precombustion chamber porous jet flow ignition type efficient combustion system which comprises a cylinder cover, an air cylinder sleeve,a piston, an air inlet passage and an air discharging passage, wherein the piston is positioned in the air cylinder sleeve; a combustion chamber is formed between the top of the piston and the cylinder cover; an air inlet valve is arranged in the air inlet passage; an air discharging valve is arranged in the air discharging passage; a natural gas supply device is arranged in the air inlet passageand is positioned in front of the air inlet valve; a precombustion chamber is formed in the cylinder cover; a sparking plug and a precombustion chamber natural gas jetting device are arranged in the precombustion chamber; and a jet orifice is formed in the part, stretching into the combustion chamber, of the precombustion chamber. The system utilizes high-temperature and high-pressure flue gas jetted by a porous passage to form a plurality of ignition sources and the compact structure of a main combustion chamber, so that the spreading distance of the natural gas flame is shortened, and multi-area ignition combustion of rate mixed gas in the cylinder is realized; and in addition, the high-temperature and high-pressure flue gas jet flow damages the large-scale eddy current in the cylinder,so that the turbulence intensity in the cylinder is improved and the combustion efficiency is remarkably improved.

Description

technical field [0001] The invention relates to an engine, in particular to a combustion chamber of a natural gas engine. Background technique [0002] Natural gas is a resource-rich clean energy with high calorific value and good anti-knock properties, and has been developed as an alternative fuel for diesel and gasoline. In order to meet the increasingly stringent emission regulations, natural gas engines generally adopt lean combustion technology and a large air-fuel ratio, so that part of the heat generated during the combustion process is absorbed by the air, reducing the temperature in the cylinder, effectively reducing NOX emissions, and avoiding deflagration at the same time . [0003] For natural gas engines with large cylinder bores for ships, due to the large diameter of the cylinder, the large internal volume of the combustion chamber, and the slow propagation rate of the natural gas flame, the combustion speed in the cylinder of the lean combustion engine is sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B43/04F02B43/10F02M21/02F02B19/10
CPCF02B19/1004F02B43/04F02B43/10F02M21/0215F02M21/0248F02M21/0278F02B2043/103Y02T10/12Y02T10/30
Inventor 杨立平罗岩费红姿宋恩哲范立云孙军
Owner HARBIN ENG UNIV
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