Three-layer secondary air low nitrogen oxide swirling burner

Abstract

The invention discloses a three-layer secondary air low nitrogen oxide (NOx) swirling burner which comprises a central air pipe as well as a primary air pipe, an inner secondary air pipe, a middle secondary air pipe and an outer secondary air pipe which are concentrically arranged at the periphery of the central air pipe from inside to outside, wherein the air inlets of the inner secondary air pipe, the middle secondary air pipe and the outer secondary air pipe are provided with swirling adjusting mechanisms for generating straightly-flowing secondary air or secondary air with variable swirling intensity by virtue of the respective secondary air pipes; three independent air boxes are sleeved outside each secondary air pipe; and the air volume of each secondary air pipe can be adjusted by air box baffle plate adjusting mechanisms on the air boxes. By adopting the structure of the low NOx swirling burner, the partial grading burning effect of the burner is enhanced and the high temperature smoke reflow is increased, thus finally achieving the aim that the burner burns coals stably and reduces the NOx generated by burning. The three-layer secondary air low NOx swirling burner has a simple structure, is easy to manufacture and install, is high in industrial applicability, is applicable to various coals and guarantees the burning stability and the burning economy of a boiler.

Description

technical field [0001] The invention relates to a swirl burner for controlling nitrogen oxides (NOx) in the combustion process, in particular to a low NOx swirl burner which can adapt to a wide range of coal types and reduce the discharge of nitrogen oxides in the combustion process of coal-fired power plant boilers. Background technique [0002] Acidic pollutant gases discharged from coal-fired power plant boilers mainly include SO x , NOx and CO 2 Wait. With the development of my country's economy and technology and the improvement of environmental protection requirements, effective control of NOx emissions from coal-fired power plant boilers not only has significant environmental benefits, but also has significant economic and social benefits. It is one of the environmental problems that need to be solved urgently. one. [0003] From the perspective of technology and economy, low NOx combustion technology has always been the most widely used measure to control NOx emiss...

AI Technical Summary

Problems solved by technology

[0004] At present, with the shortage of domestic coal price and coal supply, except for a few large-scale power stations or pithead power stations, it is difficult to ensure the coal supply according to the designed coal type

The coal type is changeable and deviates from the designed coal type, which brings many new problems to the safe operation of the boiler, such as: unstable combustion, insufficient output, failure to meet the boiler design parameters, boiler slagging, and serious pollutant discharge exceeding the standard, etc.

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