Flameless graded oxygen-enriched low-NOx combustion method and system

Abstract

The invention belongs to the field of pulverized coal combustion and emission performance control, and particularly discloses a flameless graded oxygen-enriched low-NOx combustion method and system. The method comprises the following steps that smoke participating in circulation is divided into three paths, the fuel with the preset mass carried by a primary air pipeline, a secondary air pipeline and a tertiary air pipeline is introduced into a hearth through the primary air pipeline, the secondary air pipeline and the tertiary air pipeline to be combusted, wherein air outlets of the primary air pipeline and the secondary air pipeline are positioned in a main combustion area and an air outlet of the tertiary air pipeline is located in a re-combustion area, and the injection amounts and themass flows of oxygen in air in the air pipelines are controlled so as to control the peroxide coefficient range and the flow characteristic of the main combustion area and the re-combustion area so that a fuel staged oxygen-enriched combustion mode, a fuel-oxygen two-way staged oxygen-enriched combustion mode and a flameless oxygen-enriched combustion mode are achieved. The system comprises a boiler, a flue gas pretreatment module, a chimney, the primary air pipeline, the secondary air pipeline and the tertiary air pipeline. According to the invention, stable and efficient low NOx emission canbe achieved, the ignition characteristic of pulverized coal can be improved, and pulverized coal reburning is promoted.

Description

technical field [0001] The invention belongs to the field of pulverized coal combustion and emission performance control, and more specifically relates to a flameless graded oxygen-enriched and low-NOx combustion method and system. Background technique [0002] Atmospheric CO 2 Increased levels have caused more severe global warming, storms, droughts, rising sea levels and frequent extreme weather events. To this end, countries have reached an agreement on reducing greenhouse gas emissions and formulated CO 2 The emission reduction plan aims to reduce greenhouse gas emissions by half by 2050. However, China's current energy structure and fossil energy resource reserves determine that a large amount of coal will still be used for thermal power generation in the short term. 2 Great pressure and responsibility to reduce emissions. [0003] Carbon capture utilization and storage technology (Carbon Capture Utilization and Storage, CCUS is considered to be the only way to deep...

AI Technical Summary

Problems solved by technology

[0007] Traditional combustion methods will produce a large amount of original emissions of nitrogen oxides, which cannot meet the emission standards

The existing combustion system has been able to maturely operate traditional combustion conditions, but it cannot achieve low NO during operation x At the same time, complete the large-scale capture of carbon dioxide, improve the environmental protection and economics of large-scale units and slow down the greenhouse effect

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