Low-NOx pulverized coal burner

Abstract

The invention discloses a low-NOx pulverized coal burner, which comprises an inner secondary air box, a hierarchical air box and a disturbed air box. The inner secondary air box, the hierarchical air box and the disturbed air box are separated by a first clapboard and a second clapboard sequentially; the centers of the first clapboard and the second clapboard are provided with circular holes; each pipe wall of each of the three air boxes is correspondingly provided with an air inlet which inclines towards the circumferential direction; a primary air pipe axially passes through the inner secondary air box; an inner secondary air pipe with a swirl vane is coaxially sleeved outside the primary air pipe; the inner secondary air pipe is hermetically connected with the first clapboard; the inner secondary air pipe expands conicity and extends outwards to form a conical cylinder at the circular hole of the first clapboard; the conical cylinder is arranged in the hierarchical air box; the disturbed air box is coaxially provided with a precombustion chamber with two open ends; an annular channel is formed between the wall of the disturbed air box and the wall of the precombustion chamber; an annular end face is arranged at an outlet of the annular channel; a disturbed air nozzle is fixed at an opening of the annular end face; the inlet end of the precombustion chamber is hermetically connected with the second clapboard; an annular hierarchical air channel is formed at the root of the inlet of the precombustion chamber; and the conical cylinder is hermetically fixed with the inner wall of the hierarchical air channel.

Description

technical field [0001] The invention relates to a pulverized coal burner, in particular to a low NO X Pulverized coal burner. Background technique [0002] At present, there are about 500,000 industrial boilers in my country, and coal-fired industrial boilers account for more than 80% of the total, and most of them are chain furnaces that use firebed combustion. The defects of chain furnace combustion itself determine that its thermal efficiency cannot reach a high level, and the average thermal efficiency of equipment operation is only about 65%. The pulverized coal industrial boiler using the suspension combustion method has a higher boiler efficiency. The design of the burner is the key to burning pulverized coal on industrial boilers. Due to the small furnace space of industrial boilers, it is required that the burner should be able to better organize the flow field in the furnace, so that the pulverized coal can be burned efficiently and stably, which can not only av...

AI Technical Summary

Problems solved by technology

However, most of the pulverized coal burners put into production are used in power plants, and there are fewer pulverized coal burners suitable for industrial boilers.

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