An anti-clogging system for circulating fluidized bed boiler coal drop pipe

Abstract

The invention discloses an anti-blocking system for a circulating fluidized bed boiler coal drop pipe, 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 connecting Coal feeder outlet, 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 the furnace wall, and the second coal drop pipe The other end is equipped with an air cannon, and several annular gas nozzles are sleeved on the second coal falling pipe, each of the annular gas nozzles communicates with the second coal falling pipe through several nozzles, and the air cannon and Each of the annular gas nozzles is connected to a gas source. The invention can make the raw coal not easy to be dried and bonded at the inlet of the furnace, so that it enters the furnace smoothly, and effectively solves the problem of blockage of the coal falling pipe.

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...

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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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