In-furnace grading low-NOx combustion system of low-temperature plasma rotational flow coal powder furnace

Abstract

The invention discloses an in-furnace grading low-NOx combustion system of a low-temperature plasma rotational flow coal powder furnace , which comprises a coal powder boiler and low-temperature plasma rotational flow coal powder ignition combustors arranged at two sides of the boiler in an offset manner, wherein primary air nozzles of the low-temperature plasma rotational flow coal powder ignition combustors are connected with a hearth main combustion region of the coal powder boiler, the hearth main combustion region is connected with a nozzle of a secondary air main pipeline, a hearth after-combustion region of the boiler is provided with a subsection air nozzle, the secondary air main pipeline is provided with a secondary air branch pipe, and the subsection air nozzle is connected with the secondary air branch pipe. The low-temperature plasma rotational flow coal powder ignition combustors are combined with the in-furnace low-NOx combustion system, thus a combustion device can stably carry out combustion under the condition of low load, and solves the problem that the emission of the NOx is reduced on the premise of no reduction of economic efficiency of the boiler.

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 swirl 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 developed are...

AI Technical Summary

Problems solved by technology

Therefore, the technical purpose of the present invention is to combine the low-temperature plasma swirl pulverized coal burner with the graded low NOx combustion system in the furnace, so as to ensure that the combustion equipment can burn stably under low load conditions, and at the same time solve the problem of not reducing the economic efficiency of the boiler. Under the premise of reducing NOx emissions

Images