System and method for cooling of circulating fluidized bed boiler

Abstract

The invention discloses a system and method for cooling of a circulating fluidized bed boiler. The system comprises a boiler body, a separation chamber, a slag cooler, a booster pump and a first draught fan, wherein a bottom slag discharge pipeline and a return pipeline communicate with the surface of the boiler body; and the right end of the bottom slag discharge pipeline communicates with the left side of the separation chamber. The invention relates to the technical field of fluidized bed boilers. The system and method for cooling of the circulating fluidized bed boiler have the beneficialeffects that air is blown into the separation chamber from two sides at the same time by the first draught fan and a second draught fan; the air is diverted by a first diversion plate and a second diversion plate respectively; the direction of air is changed, so that bottom slag is blown about; big-particle bottom slag is filtered out by a particle filtering net; the big-article bottom slag and small-particle bottom slag can be rapidly separated through coordination of an arc-shaped chamber; hot air treated with heat exchange and the small-particle bottom slag are fed into the boiler body again; separation effects are better; and heat of the bottom slag can be quickly brought away.

Description

technical field [0001] The invention relates to the technical field of fluidized bed boilers, in particular to a cooling system and method for circulating fluidized bed boilers. Background technique [0002] In the circulating fluidized bed boiler, the raw coal enters the furnace with a certain wide sieving particle size distribution after coming out of the coal mill for combustion, and the fine particles formed by combustion enter the tail flue with the flue gas in the form of fly ash and fly out of the boiler. The particles leave the bed from the bottom of the boiler in a high-temperature state to form bottom slag. The early circulating fluidized bed boilers had less slag discharge due to their small capacity, and the high-temperature bottom slag was generally discharged directly. However, with the continuous increase of boiler capacity , Boiler bottom slag emissions are also increasing, and the way of direct discharge is not only unfriendly to the environment, but also ca...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a cooling system and method for a circulating fluidized bed boiler, which solves the problem that the large and small particle bottom slag cannot be completely removed in the slag discharge process by simply using the blowing method. The separation, and the heat of the bottom slag cannot be completely absorbed by the blast alone, the cooling effect is poor, and the heat exchange efficiency is low.

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