Method for controlling intake air content local nitrogen enriched combustion and NOx emission

Abstract

The invention provides a method for controlling intake air content local nitrogen enriched combustion and NOx emission, which uses nitrogen enriched airflow to perform auxiliary jet in an air intake channel, and organizes the intake airflow to form variable density distribution and layering of oxygen-nitrogen content in a combustion chamber so as to achieve density gradient distribution of the oxygen-nitrogen content in the combustion chamber, form regional combustion control, and create fine combustion control technology. The oxygen-nitrogen content of the intake airflow reforms and weakens the oxygen atmosphere in a fiery combustion region, inhibits combustion, and reduces the NOx emission; in the region close to the edge of the combustion chamber, the concentration of oxygen and nitrogen is not affected by the nitrogen enriched airflow to ensure sufficient combustion in the edge region. The method achieves balanced combustion temperature, inhibits the highest combustion temperature, reduces the NOx emission and improves the combustion heat efficiency by implementing 'peak load shifting' on combustion intensity in the combustion chamber, and solves the problem of worse combustion in a weak combustion region caused by intake of full nitrogen enriched air. The provided nitrogen enriched combustion control is not limited in a working process of an internal combustion engine, sothe method has application significance for extensive combustion equipment.

Description

technical field [0001] The invention belongs to the application technical field of internal combustion engines and thermal combustion equipment, and in particular relates to the control problem of variable density distribution of intake air components enriched in nitrogen to suppress combustion and NOx emission. Background technique [0002] The requirements of emission regulations for internal combustion engines and thermal combustion equipment have prompted the continuous improvement of their combustion control technology. Through better combustion process control, thermal power enhancement and ultra-low fuel consumption and emissions have been achieved. The combustion of internal combustion engines and thermal combustion equipment is mainly subject to the concentration of oxygen and nitrogen components in the intake air. Among them, oxygen supports combustion and nitrogen prevents flames. The distribution of the two shares is the basic element of combustion process control...

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Problems solved by technology

However, these patents and researches are only full-intake nitrogen-rich combustion control, and do not mention the local zoning control of variable density distribution or stratification of intake components, that is, the concept of variable density stratification and distribution of nitrogen components

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