Fine coal powder recombustion denitrificating method

Abstract

The invention discloses a method and device for using tiny coal powder as reiguition fuel to reduce the NOX, which belongs to coal powder cleaning and combusting field. The method is: uses separator of raw and tiny coal powder to decrease the thin rate of all coal powder and improve the homogeneity, and uses part of tiny coal powder as reiguition fuel, extracts part of smoke form the tail smoke channel and then transmits the reiguition fuel into the reacting area, the NOX generated in the primary combustion area into N2; pours in part of combustion air from the top of the reacting area, ensures the coal powder combustion safety. The invention can decrease the discharge of nitrogen-oxygen material for 60% based on guaranteeing the boiler efficiency. In order to realize the technology, the primary combustor on the furnace is arranged with a reiguition fuel, burned wind aperture, and assembled with advanced raw powder separator and smoke extracting and transmitting system. The method in the invention has high denitration efficiency, it does not affect the combustion efficiency, the structure is reasonable, the investment is little, and the running cost is low.

Description

technical field [0001] The invention belongs to boiler combustion technology, and relates to a method for clean coal combustion and reduction of NOx emission from a coal-fired boiler, in particular to a fine coal powder reburning and denitrification method. Background technique [0002] my country is rich in coal resources. For a long time, coal has always occupied a dominant position in my country's energy production and consumption. According to statistics, coal accounts for 76% of the country's total primary energy production and 75% of the total primary energy consumption. With the rapid growth of my country's economy, the consumption of coal will increase. The massive consumption of coal, while providing sufficient energy, has also brought about many environmental problems, among which nitrogen oxides (abbreviated as NOx) is one of the important air pollutants. The combustion of pulverized coal is an important source of nitrogen oxides. The NOx emitted by a large numb...

AI Technical Summary

Problems solved by technology

The denitrification technology in combustion has the characteristics of simple system, relatively low cost of transformation and operation, but the disadvantage is that the denitrification efficiency is low, and it cannot meet the requirements of deep reduction of NOx emissions

The denitrification efficiency of post-combustion denitrification technology is relatively high (can exceed 90%), but its system is complicated, and the construction and operation costs are high, so it is very difficult to promote it in a large area in my country

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