Air-cooled slag discharge pipe used for small and medium size circulating fluidized bed boiler

Abstract

The invention discloses an air-cooled slag discharge pipe used for a small and medium size circulating fluidized bed boiler. The air-cooled slag discharge pipe used for the small and medium size circulating fluidized bed boiler comprises a slag discharge pipe main body mounted in an air chamber of a hearth, wherein the upper end of the slag discharge pipe main body is connected with an air distributing plate in the hearth; the lower end of the slag discharge pipe after stretching out of the air chamber is connected with an ash collection device; the air distributing plate is provided with multiple air caps around the sag discharge pipe main body; multiple air cap holes are arranged at the upper part of each air cap; an outer pipe is arranged at the outer part of the upper end of the slag discharge pipe main body; the outer pipe is connected with the upper end and the lower end of the slag discharge pipe main body through an upper annular plate and a lower annular plate; the lower annular plate is provided with multiple air inlet holes; and correspondingly, multiple air outlet holes are arranged on the pipe wall at the upper part of the slag discharge pipe main body. The air-cooled slag discharge pipe used for the small and medium size circulating fluidized bed boiler, disclosed by the invention, has the advantages of a simple structure, easy arrangement, low manufacturing cost, and a capability of efficiently preventing negative phenomena of deterioration of partial flow state around the slag discharge pipe.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to an air-cooled slagging pipe used for small and medium-sized (less than 40 tons) circulating fluidized bed boilers. Background technique [0002] At present, due to its unique fluid dynamic characteristics and structure, the fluidized bed boiler has unique advantages such as wide fuel adaptability, high combustion efficiency, and wide load adjustment range. However, most of the fluidized beds are unstable gas-solid systems, and a reasonable air distribution design must be carried out in order to make them operate well. This is especially important for small and medium-sized boilers (less than 40 tons). For small and medium-sized fluidized bed boilers using water-cooled slag discharge pipes, the adverse phenomenon of local fluidization deterioration is likely to occur around the slag discharge pipes during operation. The main reason for this phenomenon is that when the boiler...

AI Technical Summary

Problems solved by technology

Effectively solve the problems existing in the slagging pipes of small and medium-sized circulating fluidized bed boilers in the prior art

Images