Depth hierarchy low-NOx combustion system in low-temperature plasma direct-current pulverized coal furnace

Abstract

The invention discloses a depth hierarchy low-NOx combustion system in a low-temperature plasma direct-current pulverized coal furnace. The system comprises a furnace and four low-temperature plasma direct-current pulverized coal ignition combustors which are configured in the main combustion region of a boiler hearth in a four-angle mode; a primary air nozzle of each low-temperature plasma direct-current pulverized coal ignition combustor is connected with the main combustion region of the hearth, and the main combustion region of the hearth is connected with a secondary air main pipeline nozzle; the hearth after-combustion region of the boiler is provided with a sectional air nozzle; a secondary air branch pipe is configured on the secondary air main pipeline; the sectional air nozzle is connected with the secondary air branch pipe, i.e., fuel materials are subjected to thermal cracking treatment before the combustion of the fuel materials, and the combustion effect is improved; andhierarchy air distribution is adopted for the combustion in a fuel furnace, thus the NOx generation is reduced. Therefore, according to the invention, the low-temperature plasma direct-current pulverized coal ignition combustors and the furnace hierarchy low-NOx combustion system are combined, the stable combustion of a combustion device under a low-load condition is ensured, simultaneously on the premises of not reducing the economic efficiency of the boiler, the emission of NOx is reduced.

Description

technical field [0001] The invention relates to a pulverized coal low-NOx combustion system, in particular to a pulverized coal low-NOx combustion system which combines a low-temperature plasma direct-flow pulverized coal burner and a graded air distribution technology in a furnace and applies it to a boiler. It belongs to the technical field of thermal energy power engineering and the technical field of environmental protection. Background technique [0002] Nitrogen oxides are one of the main air pollutants, mainly including NO, NO 2 , N 2 O, N 2 o 3 , N 2 o 5 etc., collectively referred to as NOx. In addition to harming human health as a primary pollutant, nitrogen oxides will also produce a variety of secondary pollution. Nitrogen oxides are one of the important precursors for the formation of ozone, and are also an important reason for the formation of regional fine particle pollution and haze. As a result, the visibility of the atmosphere in economically develop...

AI Technical Summary

Problems solved by technology

The application of these technologies usually changes the combustion structure in the furnace, thus affecting the combustion efficiency of the boiler

In the actual operation of the boiler, considering the requirements of ignition, stable combustion and burnout after pulverized coal is sprayed into the furnace, as well as the economic indicators of boiler operation, the degree of fuel classification and air classification is limited, and the effect of NOx emission reduction cannot meet expectations

Images