Coal-fired boiler coal pulverizer storage type nitrogen oxide reduction system

Abstract

The invention relates to a storage-type super-low nitric oxide system in a coal fired boiler coal mill. On the basis of the existing low-nitrogen burning technology, the superfine coal powder preparation technology and the smoke circulating technology are adopted. The smoke circulating technology adopts cold furnace smoke to be mixed with primary air to be supercharged by a primary fan, the heating and powder feeding technology of an air preheater and the hot air and high-temperature furnace smoke drying technology of the powder production system are adopted, i.e. superfine coal powder can be prepared, the hot furnace smoke enters a primary air large air bellow, the hot furnace smoke is mixed with superfine coal powder prepared by a superfine coal powder preparation device in a coal powder blender and supplied by a powder supply machine from a coal powder cabin to be heated, and the air-powder mixture is fed into a low-nitrogen burner through a primary air pipe. In the main burning area of the boiler, since the air content of the furnace smoke is little, a lower residual air coefficient can be realized, the emission of the nitric oxide can be reduced.

Description

technical field [0001] The invention relates to a coal-fired boiler system, in particular to a coal-fired boiler coal pulverizer storage type system for reducing nitrogen oxides. Background technique [0002] With the continuous development of the economy and the continuous improvement of living standards, the pollution of the environment in which human beings live is also increasing. Therefore, it is necessary to continuously improve technology to meet the requirements of human beings for the living environment. The combustion of power plant boilers produces a large amount of nitrogen oxides, which seriously pollutes the living environment. [0003] At present, the out-of-stock technology adopted by coal-fired boilers in thermal power plants can be divided into combustion technology for reducing nitrogen oxides in the furnace and tail. The low-nitrogen combustion technology in the furnace adopts multi-stage air classification and thick and thin burners. 40-50%; SCR denitri...

AI Technical Summary

Problems solved by technology

The combustion of power plant boilers produces a large amount of nitrogen oxides, which seriously pollutes the living environment

[0003] At present, the out-of-stock technology adopted by coal-fired boilers in thermal power plants can be divided into combustion technology for reducing nitrogen oxides in the furnace and tail. The low-nitrogen combustion technology in the furnace adopts multi-stage air classification and thick and thin burners. 40-50%; SCR denitrification device needs to be installed at the tail to further reduce the discharge of nitrogen oxides, which can meet environmental protection requirements. Based on the development of multi-stage air classification and rich-lean combustion technology, how to effectively reduce the emission of nitrogen oxides at a lower cost is a very meaningful topic at present.

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