Large-scale circulating fluid bed boiler with buffering bed

Abstract

The invention relates to a large-scale circulating fluid bed boiler with a buffering bed, and relates to a structural design of the circulating fluid bed boiler. The circulating fluid bed boiler provided by the invention is provided with two hearths which are adjacently arranged in parallel, the upper parts of two hearths are completely separated, and the lower parts of the two hearths are communicated through the buffering bed; the buffering bed consists of a buffering bed top, a buffering bed front wall and a material channel formed by front and rear walls of the buffering bed and a buffering bed grid plate, the buffering bed is formed by extending and expanding two-side hearths, the structure is simple, and the buffering bed is of a membrane wall structure; materials in the lower parts of the two-side hearths transversely flow through the buffering bed, the concentration distribution uniformity and the of the temperature distribution uniformity of the materials in the two-side hearths are improved; the upper parts of the hearths are completely separated, so that extended heating surfaces such as airfoil-shaped walls and the like are conveniently distributed in the hearths; the water cooled wall heating condition at the periphery of each hearth is coincident, the water power security of the boiler is improved. The bed pressure on the two-side hearths of the boiler is self-balancing through the buffering, a ' bed turning' phenomenon is basically eliminated, and the operational security of the boiler is improved.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a large circulating fluidized bed boiler in which both sides of the separator are arranged symmetrically. Background technique [0002] With the continuous development of circulating fluidized bed combustion technology, the capacity of circulating fluidized bed boilers is also increasing. The heat release volume of the furnace increases faster than the heating area in the furnace, and more heating surfaces need to be arranged in the furnace. And with the increase of boiler capacity, the cross-sectional area of ​​the furnace is also increasing, and the secondary air penetration is limited, and the center of the furnace is prone to form an oxygen-poor zone; in addition, the area of ​​the air distribution plate also increases accordingly, and the uniform flow of materials in the bed The difficulty of chemicalization is increased, and the bed in the dense phase area is prone to l...

AI Technical Summary

Problems solved by technology

"Turning the bed" makes the bed material in one leg lose fluidization, causing coking in the furnace, which seriously threatens the safe and stable operation of the boiler

In the operation of the boiler, the fine automatic control can better prevent the phenomenon of "turning the bed", but it cannot fundamentally eliminate the phenomenon of "turning the bed"

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