Circulating fluidized-bed boiler with multiple separators and annular hearth

Abstract

A circulating fluidized-bed boiler with an annular hearth comprises the hearth and two sets of cyclone separators. The cyclone separators are correspondingly arranged on the outer sides of the two side walls. Each set of cyclone separators is provided with three cyclone separators, and all the cyclone separators are the same in cylinder structure and size. In the plane crossing all the hearth smoke outlet center points, the hearth smoke outlet center points of the two separators on the outmost side in one set of separators and the hearth smoke outlet center holes of the two separators on the outermost side in the other set of separators are symmetric about the intersecting point of the hearth center face perpendicular to the first side wall and the hearth center face perpendicular to the second side wall; and the hearth smoke outlet center points of the two separators on the outmost side in each set of cyclone separators are axially symmetric about the hearth center line formed by the intersecting line of the hearth center face perpendicular to the first side wall and the plane. The position relation of the two cyclone separators on the outmost side in each set of cyclone separators meets the conditions that when b is smaller than or equal to 2m, a is larger than or equal to b / 3 and smaller than b-0.3m; and when b is larger than 2m, a is larger than or equal to m / 2 and smaller than b-0.3m.

Description

technical field [0001] The invention relates to the technical field of circulating fluidized bed boilers, in particular to the arrangement of cyclone separators of circulating fluidized bed boilers. Background technique [0002] Since the circulating fluidized bed combustion technology was applied in the field of power generation, it has been developing in the direction of large capacity and high parameters. While the capacity and parameters of the circulating fluidized bed boiler are enlarged, in order to ensure the separation efficiency, the size of the cyclone separator cannot be increased synchronously with the size of the furnace, so the parallel arrangement of multiple cyclone separators is a commonly used structure for large circulating fluidized bed boilers form. However, the gas-solid two-phase flow in a circulating fluidized bed with multi-cyclone separators belongs to the problem of multiphase flow in parallel channels. Both the literature reports and the actual ...

AI Technical Summary

Problems solved by technology

However, due to the existence of the water-cooling column, the distribution of the gas-solid flow field in the furnace is changed, especially for the two separators located in the middle of both sides of the furnace. Gas-solid circulation between vessels is weakened

The multi-separator layout plan summarized in the development of the circulating fluidized bed boiler with a rectangular upper section of the furnace is no longer applicable to the circulating fluidized bed boiler with this structure

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