Burner arrangement method and arrangement structure for power station boiler

Abstract

The invention discloses a burner arrangement method and arrangement structure for a power station boiler. The method disclosed by the invention is characterized in that a pulverized coal burner is arranged by adopting a manner of combining tangential combustion and opposed combustion. The burner arrangement method and arrangement structure disclosed by the invention have the beneficial effects that combustion stability and economy problems of a boiler are solved firstly and less NOx is discharged. By virtue of massive research and calculation by the inventor, results show that the tangential combustion manner has better economy and less NOx discharge but has poor combustion stability, if the combustion stability is better and a flame is used for supporting combustion, the characteristics of the tangential combustion can be fully played. A symmetric combustion manner has better whole combustion stability as a single burner has stronger combustion stabilizing capability and has poor combustion economy as a combustion stroke is shorter, and NOx discharge is higher as a local high temperature region is formed by higher power of the single burner. Thus, if the advantages of the two combustion manners are combined to form a new combustion manner, better combustion effects can be achieved.

Description

technical field [0001] The invention relates to a burner arrangement method and arrangement structure of a power station boiler, belonging to the field of boiler combustion and design. Background technique [0002] At present, the main combustion methods of power plant boilers are tangential and hedging. There are two ways of tangent circles: four-corner tangent circle and furnace double tangent circle; symmetry has two ways: front and rear wall horizontal symmetry and W flame symmetry. Both tangential and hedging combustion methods have their own advantages and disadvantages. The four-corner tangential combustion is supported by the upstream and downstream to form a stable combustion flame. The flame rotates in the furnace to make the flame stroke long, the combustion economy is high, and the NOx content is low; but the anti-interference ability of the combustion is low, and because of the tangential The temperature of the furnace outlet caused by combustion has a large d...

AI Technical Summary

Problems solved by technology

The four-corner tangential combustion is supported by the upstream and downstream to form a stable combustion flame. The flame rotates in the furnace to make the flame stroke long, the combustion economy is high, and the NOx content is low; but the anti-interference ability of the combustion is low, and because of the tangential The furnace outlet temperature caused by combustion has a large deviation on both sides

Opposite combustion (see Figure 3) each burner burns in parallel, with little mutual influence, a single burner has strong independent combustion stability, and the temperature deviation on both sides of the furnace outlet is small, but due to the short stroke of the symmetrical combustion flame, the combustion economy is relatively low Poor, at the same time, due to the high local combustion intensity, the NOx content is high

Images