Supercritical circulating fluidized bed boiler with double-return evaporating heating surface

A technology of evaporating heating surfaces and circulating fluidized beds, which is applied in steam boilers, steam superheating, steam generation, etc., can solve the problems of increased cost, long pipelines, and high difficulty in system structure layout, so as to reduce boiler costs, reduce heating area, The effect of increasing safety performance
CN102012016BActive Publication Date: 2012-08-01SHANGHAI BOILER WORKS
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI BOILER WORKS
Publication Date
2012-08-01

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Abstract

The invention relates to a supercritical circulating fluidized bed boiler with a double-return evaporating heating surface, which is characterized by comprising a descending section water-cooled screen inlet collection box connected with a hearth water-cooled wall outlet collection box, a descending section water-cooled screen connected with the descending section water-cooled screen inlet collection box, a water-cooled screen connecting collection box connected with the descending section water-cooled screen, an ascending section water-cooled screen connected with the water-cooled screen connecting collection box, and an ascending section water-cooled screen outlet collection box connected with the ascending section water-cooled screen, wherein the descending section water-cooled screen and the ascending section water-cooled screen adopt a double-return arrangement mode. The double-return arrangement mode is adopted, the hearth outlet collection box and the descending section water-cooled screen inlet collection box are arranged on the top of a hearth, the connecting length of pipelines is reduced, smaller hearth water-cooled wall heating area can be required, and the height of the hearth can be reduced.
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Description

technical field

[0001] The invention relates to a circulating fluidized bed boiler, in particular to a supercritical circulating fluidized bed boiler with a double-return evaporation heating surface. Background technique

[0002] With the development of circulating fluidized bed boilers from subcritical parameters to supercritical parameters, the layout of the furnace water circulation system and the hydrodynamic safety of the furnace evaporation heating surface will become a key technology. The supercritical parameters require that the working fluid passes through the furnace water wall. and other evaporating heating surfaces, a superheated steam with a certain degree of superheat is formed, so the proportion of heat absorbed by the working medium in the furnace to the total heat absorbed by the working medium is getting higher and higher. In the furnace of a supercritical circulating fluidized bed boiler, About 60%-70% of the total heat absorption of the working fluid is r...

Claims

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