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A lean-burn organization method for a dual-fuel engine

A dual-fuel engine, lean combustion technology, applied to combustion engines, internal combustion piston engines, engine control, etc., can solve the problems of increased HC emissions, low engine economy, and reduced reliability, and achieve the effect of low-emission combustion

Active Publication Date: 2020-11-03
HARBIN ENG UNIV
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Problems solved by technology

[0004] The research on diesel / natural gas dual-fuel engines shows that: diesel / natural gas dual-fuel engines have good power performance under heavy load conditions, reaching the power level of diesel engines, PM and NOx emissions are reduced, but reliability is reduced; When the HC emission increases, the engine economy is low

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  • A lean-burn organization method for a dual-fuel engine
  • A lean-burn organization method for a dual-fuel engine
  • A lean-burn organization method for a dual-fuel engine

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Such as figure 1 Shown, the dual-fuel engine combustion system that the present invention relates to mainly consists of piston (1), cylinder (2), cylinder head (3), secondary fuel injector (4), main fuel injector (5), spiral inlet (6), low-pressure natural gas injection valve (7), intake valve (8) and combustion chamber (9).

[0031] Such as figure 2 , the helical inlet of the dual-fuel engine combustion system is composed of an air passage inlet, a helical chamber and an air passage outlet, wherein the helical chamber is composed of multiple tangent three-dimensional circular arcs. During the intake stroke, the spiral intake port forces the air into the cylinder along the expected diversion direction, generating a strong vortex, so that the air and gas are fully mixed. The intake port adopts a spiral structure. Under the action of the intake swirl, the natu...

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Abstract

The invention relates to the field of combustion methods of internal combustion engines, in particular to an organization method for lean combustion of a dual-fuel engine. The organization method comprises the following steps that (1) in the air inlet stroke, air is forced to enter a cylinder in an expected guide direction along a spiral air inlet duct to generate a large vortex, so that air and fuel gas are fully mixed; and (2) when the engine operates in a fuel gas combustion mode, layer-by-layer gradient control over the concentration of the mixed gas in the cylinder is achieved by adjusting the number of times of low-pressure injection of natural gas and the injection timing of the natural gas according to different working conditions of the engine. According to the organization methodfor lean combustion of the dual-fuel engine, the strength of the vortex in the cylinder is improved through the spiral air duct; and the combustion initial point is controlled by controlling the fuelinjection timing of a main fuel injector and an auxiliary fuel injector, so that stable, efficient and low-emission combustion of the dual-fuel engine is achieved under different working conditions.

Description

technical field [0001] The invention relates to the field of internal combustion engine combustion methods, in particular to a lean combustion organization method for a dual-fuel engine. Background technique [0002] Compared with other types of engines, dual-fuel engines have obvious advantages in terms of economy of use, thermal efficiency, combustion noise, NOx and PM emissions, etc.; Knocking is prone to occur under load, the increase of natural gas substitution rate is limited, and there are problems such as high HC and CO emissions. [0003] In terms of optimizing the combustion system, patent CN102996223A achieves homogeneous premixed compression ignition by injecting fuels with different octane numbers through the main and auxiliary nozzles, which ensures high thermal efficiency; patent CN106870186A summarizes the possible fuel injection methods for dual-fuel engines, Different combustion modes are realized through the combination of different fuel injection modes. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/00F02D19/08F02B31/00
CPCF02B31/00F02D19/08F02D41/0025Y02T10/12
Inventor 杨立平包军杰范立云宋恩哲孙军
Owner HARBIN ENG UNIV
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