Circulating fluidized bed boiler

Abstract

The invention relates to a circulating fluidized bed boiler, belongs to the field of mechanized equipment, and particularly relates to a circulating fluidized bed boiler. The circulating fluidized bed boiler comprises a boiler chamber and a returning charge device and is successively provided with a combustion chamber, a cyclone separator and a rear smoke channel from front to back, wherein the hearth is a full-suspended water wall; an air distribution plate of the water wall is uniformly provided with an air cap; a high-temperature superheater is suspended above the rear smoke channel; a low-temperature superheater, a coal economizer and an air preheater are of support structures; the boiler is of an all-steel frame structure; and four rows of stand columns are arranged backward in front of the boiler. The circulating fluidized bed boiler is characterized in that the air cap is changed to be a small bell jar type air cap; and the upper end of the air cap is connected with an air cap head through a clamp cover. The circulating fluidized bed boiler is reasonable in structure and easy in replacing of the air cap, completely solves the problems of air cap abrasion and air chamber ash, is stable in air feeding and returning charge operation, and can ensure stable operation of the whole combustion system.

Description

technical field [0001] The invention relates to the field of mechanical equipment, in particular to a circulating fluidized bed boiler. technical background [0002] As a new generation of clean coal technology, circulating fluidized bed combustion technology has been widely used in the world. The low-temperature combustion characteristics of circulating fluidized bed boilers allow the desulfurization process to be carried out in the combustion zone. The furnace of circulating fluidized bed boiler contains a large amount of materials. During the combustion process, a large amount of materials are carried to the upper part of the furnace by the flue gas. After passing through the separator arranged at the outlet of the furnace, the materials are separated from the flue gas and passed through the non-mechanical return valve. The material is returned to the bed to realize multiple cycle combustion. Due to the high material concentration, large heat capacity and good material ...

AI Technical Summary

Problems solved by technology

[0003] However, the existing circulating fluidized bed boilers often suffer from wear and tear of the wind cap and severe ash pouring in the air chamber, and are prone to bending and deformation under high-temperature operation, resulting in poor reliability; the return air is provided in parallel with the primary air, and the primary air is adjusted at the same time Affect the supply of the return air, and improper operation may easily cause the phenomenon of unstable return, intermittent return and over-temperature coking of the return device

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