Boiler flue structure

Abstract

The invention relates to a boiler flue structure which belongs to the technical field of combustion equipment. The boiler flue structure comprises a first flue, a second flue and a tail flue, wherein a boiler hearth outlet flue is partitioned into a U-shaped flue by a water-cooled wall partition, and the first flue and the second flue are sequentially arranged along a flue gas flow, and the first flue and the second flue are communicated through an ash bucket; a high-temperature reheater is arranged in the first flue, and a final stage superheater is arranged in the second flue; convection heating surfaces of a low-temperature reheater and a coal economizer are arranged in the tail flue; the bottom of the U-shaped channel is provided with the ash bucket which not only is a reversing chamber of the flue gas flow, but also can be used for ash deposition; the bottom of the ash bucket is provided with a gas lock which is convenient for regularly clearing ash deposition; and heating surfaces arranged in the U-shaped channels are all of slag coagulation structure in a large-pitch arrangement mode. By adopting the boiler flue structure provided by the invention, the problem of severe pollution of boiler high-temperature convection heating surfaces.

Description

technical field

[0001] The invention relates to the structural design of a coal-fired boiler, in particular to the structural design of the flue of a coal-fired boiler with serious pollution on the high-temperature convection heating surface, and belongs to the technical field of combustion equipment. Background technique

[0002] Contamination of the high-temperature convective heating surface is an inevitable phenomenon during the operation of the boiler. It affects the heat transfer of the heating surface, reduces the output of the boiler, causes metal corrosion on the tube wall of the heating surface, and even causes problems such as over-temperature tube explosion when the contamination is serious. A well-designed boiler flue structure can help solve the problem of contamination on the high-temperature heating surface.

[0003] Zhundong coal has high volatile content and low ash content, so it is easy to catch fire and burn out. However, Zhundong coal has a high conten...

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