Thin-phase combustion method for realizing low-emission of diesel engine and apparatus thereof

Abstract

The invention provides a dilute phase combustion method for realizing low emission of diesel engine and a device thereof, wherein the diesel fuel is ejected into the high temperature high pressure synthetic gas for pre evaporation and then mixes with the compressed excess air for combustion; the synthetic gas is made by using the afterheat of the diesel scavenging air to catalyze and crack the carbinol; the pre evaporation process of the diesel fuel is completed in a pre evaporation chamber, a pore piston is arranged between the pre evaporation chamber and the combustion chamber and controls the communication and the break of two spaces; when the air compression is close to the end, the pore piston opens the pore canal and is instantly lifted to the top part of a cylinder due to the impact of the great air differential pressure and the driving of the sliding control bar, which presses the gas in the pre evaporation chamber into the combustion chamber to mix with the air for combustion. The invention has the advantages of reducing the NOx emission of the diesel engine by more than 95 percent and PM by more than 60 percent, keeping relatively low HC and CO emission, overcoming defects existing in prior dilute phase combustion diesel engine of the narrow operating range, the low compression ratio and uneasy control of the fire ignition angle, etc.

Description

technical field [0001] The invention relates to a dilute-phase combustion method capable of realizing low emission of a diesel engine. [0002] The invention also relates to a device for implementing the above method. Background technique [0003] The efficiency of the diesel engine is as high as 33-42%, which can save energy by 30% compared with the gasoline engine. However, with the increasingly stringent emission regulations of various countries in the world, the traditional diesel engine is facing great challenges. The main pollutants of diesel engine exhaust are nitrogen oxides (NOx) and particulate matter (PM). The conditions for the formation of NOx are high temperature and rich oxygen, while the main reason for the formation of PM is the local hypoxia caused by the uneven mixing of oil and gas. At present, the basic method to achieve low NOx and PM emissions from diesel engines is dilute-phase combustion, that is, to use high air-fuel ratio to reduce local hypoxia a...

AI Technical Summary

Problems solved by technology

[0008] In order to achieve the above object, the technical solution of the present invention is to pre-evaporate diesel in high-temperature and high-pressure syngas, and then mix and burn with excess compressed air in non-premixed dilute phase combustion. This method can effectively reduce NOx and particulate matter in diesel engine exhaust. , unburned hydrocarbons (HC) and CO and other pollutants, overcome the shortcomings of dilute-phase combustion diesel engines with narrow operating range, low compression ratio and difficult control of ignition angle

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