Anti-abrasion uniform coal feeding device for circulating fluidized bed

Abstract

The invention discloses an anti-abrasion uniform coal feeding device for a circulating fluidized bed. The problems of how to reduce impact and abrasion of coal particles on a uniform coal feeding pipeand how to reduce the too high concentration ratio when the coal particles enter a hearth are solved. A coal conveying air pipe (2) communicates with an upper port of a uniform coal feeding pipe (4),the cross section of an inclined downward pipe section (8) is gradually changed from round to oval, the cross section of a horizontal pipe section (9) is round, and the cross section of the uniform coal feeding pipe (4) is oval; a coal conveying air flow deflector (3) is arranged at the communication position of a coal falling pipe (1) and the uniform coal feeding pipe (4), and the coal conveyingair flow deflector (3) seals an upper half inner cavity, above a coal falling opening, of the uniform coal feeding pipe (4); and a uniform coal spreading air pipe (6) and a circular coal spreading air pipe (5) are arranged at the communication part of the uniform coal feeding pipe (4) and a water cooling film type wall (7) in a hearth, and coal particles are fully combusted, and the carbon content of bottom slag is reduced.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a device in the circulating fluidized bed boiler which can effectively prevent the coal feeding pipe from being worn and uniformly feed coal to the boiler. Background technique [0002] The circulating fluidized bed boiler uses coal as fuel, and the coal is fed into the furnace of the circulating fluidized bed boiler for combustion through the coal feeding device. It is composed of coal pipe and uniform material sowing air pipe, etc. The coal falling pipe connected to the coal bunker is in a vertical downward state. The lower end of the coal falling pipe is connected with an inclined uniform material feeding pipe. The water-cooled membrane walls in the furnace are connected together; the coal particles in the coal bunker fall vertically through the coal falling pipe, and will directly hit the inner wall of the coal feeding pipe arranged obliquely. Due to the limited coal con...

AI Technical Summary

Problems solved by technology

[0003] The invention provides an anti-abrasion uniform coal feeding device for a circulating fluidized bed, which solves how to reduce the impact and wear of coal particles on the coal feeding pipe, and how to improve the excessive concentration of coal particles when they enter the furnace. Technical Problems of Coal Pipe Blockage and Tempering

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