Circulating fluidized bed boiler

Abstract

The invention discloses a circulating fluidized bed boiler, which comprises an air distributor and a hearth surrounded by water cooling walls, wherein the air distributor comprises an air distributing plate, a plurality of air pipes passing through the air distributing plate to extend and air caps arranged on each air pipe, and a hole is formed on each air cap and communicated with the air pipe; in the central region of the air distributing plate, the flow area of the air distributor is smaller than those of other regions; a transition layer is arranged on a corner part between two adjacent water cooling walls and generates arc transition between the adjacent water cooling walls. By reducing the flow area in the central region with a thinner bed material, the aims of grading air distribution and uniform fluidizing are fulfilled, so that the efficiency of the circulating fluidized bed boiler is improved and the problems of air cap wear and slag leakage can also be solved radically. Moreover, the arc-shaped transition layer is formed between the adjacent water cooling walls, so that the wear of the corner parts can be relieved. Thus, the circulating fluidized bed boiler of the invention can guarantee long-period, safe and stable operation.

Description

technical field [0001] The present invention relates to circulating fluidized bed boilers. Background technique [0002] Circulating fluidized bed boilers use circulating fluidized bed combustion technology, which has the advantages of good fuel adaptability, high efficiency, and less pollution emissions. Among them, the fluidization is realized by the following method: the air required for combustion enters the fluidized bed evenly through the air distribution plate at the bottom of the furnace, and maintains an appropriate airflow rising speed in the fluidized bed, and the airflow holds up most of the material particles While moving up and down, it becomes boiling, so the mixing is very strong. It can be seen that the ventilation system is the key to the entire combustion system. [0003] In the circulating fluidized bed boiler, the fan provides air to the air preheater for preheating, and the preheated air enters the bottom air chamber of the furnace, and enters the fur...

AI Technical Summary

Problems solved by technology

In addition, the small air distribution resistance will also lead to difficulty or uneven fluidization of the bed surface

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