Circulating fluidized bed boiler coal drop pipe anti-blocking system

Abstract

The invention discloses a circulating fluidized bed boiler coal drop pipe anti-blocking system which comprises a vertically-arranged first coal drop pipe and an obliquely-arranged second coal drop pipe, the upper end of the first coal drop pipe is used for being connected with an outlet of a coal feeder, and the lower end of the first coal drop pipe communicates with the side wall of the second coal drop pipe. One end of the second coal drop pipe is installed on a furnace wall, an air cannon is installed at the other end of the second coal drop pipe, the second coal drop pipe is sleeved with a plurality of annular gas spray pipes, and each annular gas spray pipe communicates with the second coal drop pipe through a plurality of nozzles. The air cannon and each annular gas spray pipe are connected with a gas source. According to the circulating fluidized bed boiler coal drop pipe anti-blocking system, raw coal is not easy to dry and bond at the furnace inlet, so that the raw coal smoothly enters the hearth, and the problem of blockage of the coal dropping pipe is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of coal feeding systems for circulating fluidized bed boilers, and in particular relates to an anti-blocking system for coal falling pipes of circulating fluidized bed boilers. Background technique [0002] Between the coal feeder and the inlet of the fluidized bed boiler, the coal feeding into the furnace is generally completed through the coal drop pipe. Due to the combustion characteristics of fluidized bed boilers, the coal fed into the furnace is usually low-quality coal with low calorific value, or even coal gangue with some mud, and the humidity is usually high. When the water content is greater than 10%, the fluidity of the coal entering the furnace decreases and the viscosity increases. The mouth of the furnace pipe evaporates quickly and sticks to the pipe wall. As the amount of coal entering the boiler increases, it gradually forms a blockage. Once a coal blocking fault occurs, it will be diffic...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides an anti-clogging system for the coal falling pipe of a circulating fluidized bed boiler, which can make the raw coal not easy to dry and stick at the furnace entrance, thereby smoothly entering the furnace, and effectively solves the problem of coal falling. coal pipe blockage

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