Three-layered secondary air low nitrogen oxide swirl burner

Abstract

The invention provides a three-layered secondary air low nitrogen oxide (NOx) swirl burner, which consists mainly of: a first-layer center air pipe, a first-layer primary air pipe, an internal secondary air pipe, a middle secondary air pipe, an external secondary air pipe and a third-layer secondary air pipe in a sequentially sleeved manner from inside to outside, wherein the primary air pipe adopts the tangential air feeding manner, an outlet end of the primary air pipe is equipped with a coal dust collector; the internal secondary air pipe and the external secondary air pipe are internally equipped with swirl blades; the outlet ends of the secondary air pipes all have certain angles expanding outwards. With the above structure, the low NOx swirl burner according to the invention can reinforce the local fractional burning effect thereof and increase the quantity of flux of high temperature smoke, thereby ultimately reaching the purpose of stable burning and reduction of NOx generated by burning. The swirl burner according to the invention has strong industrial applicability and wide applicable types of coal, and is particularly suitable for coal used for power in power system in China.

Description

technical field [0001] The present invention relates to nitrogen oxides (NO x ) field of emission control devices, especially relating to a low NO x burner. Background technique [0002] Acidic pollutant gases discharged from coal-fired power plant boilers mainly include SO x , NO x and CO 2 Wait. With the development of my country's economy and technology and the improvement of environmental protection requirements, the NO x Effective control of emissions 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. [0003] From a technical and economic point of view, low NO x Combustion technology has been the most widely used to control coal-fired boiler NO x Emission measures, even in order to meet the emission standards have to use post-combustion flue gas denitrification technology with huge investment and operating costs, still must adopt low NO ...

AI Technical Summary

Problems solved by technology

[0004] At present, there are low NO x Swirl burner can effectively reduce NO in lignite and bituminous coal boilers x However, lean coal, anthracite and other low-volatile coals have the characteristics of difficulty in ignition, poor combustion stability, and difficulty in burning out. The conventional means are to strengthen ignition, intensify combustion, and increase thermal intensity, which is of course beneficial to lean coal and anthracite. combustion, but also leads to NO x increase in production and thus existing low NO x Effect of Swirl Burner on NO of Lean Coal / Anthracite Boiler x Mitigation effect is very poor

However, the proportion of lean coal and anthracite boilers in my country's coal-fired power plants is relatively large, and the quality of coal in power plants is variable and poor. poor low volatile coal

Low volatile coal boiler adopts low NO x Swirl burner achieves stable combustion and low NO at the same time x The problem of emissions has not been well resolved so far, and there are few related researches at home and abroad.

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