A 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 specifically discloses a flameless graded oxygen-enriched and low NOx combustion method and system. The method is as follows: the flue gas participating in the circulation is divided into three paths, and the fuel of a preset quality carried by the primary air duct, the secondary air duct and the tertiary air duct are passed into the furnace for combustion. The air outlet of the secondary air duct is located in the main combustion area, and the air outlet of the tertiary air duct is located in the re-combustion area. The injection amount and mass flow of oxygen in each secondary air are controlled to control the range and the oxygen peroxide coefficient of the main combustion area and the re-burning area. Flow characteristics to realize fuel staged oxyfuel combustion mode, fuel-oxygen two-way staged oxyfuel combustion mode and flameless oxyfuel combustion mode. The system includes a boiler, a flue gas pretreatment module, a chimney, a primary air duct, a secondary air duct and a tertiary air duct. The invention can achieve stable and efficient low NO x emission, and can improve the ignition characteristics of coal powder, and promote the reburning of coal powder.

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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