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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

Active Publication Date: 2012-08-01
SHANGHAI BOILER WORKS
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AI Technical Summary

Problems solved by technology

Its disadvantage is that the outlet of the water-cooled wall of the furnace 13 is led by pipelines to the inlet header 16 of the water-cooled screen in the ascending section, and the connecting pipelines are long, which makes the system structure layout difficult and the cost increases

Method used

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

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Embodiment Construction

[0030] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

[0031] The present invention describes a supercritical circulating fluidized bed boiler with a double-pass evaporation heating surface, the structure of which is as follows Figure 4 As shown, the boiler includes an economizer 21, a furnace water-cooled wall inlet header 22, a furnace 23, a furnace water-cooled wall outlet header 24, a steam-water separator 25, a descending section water-cooled screen inlet header 26, a descending section water-cooled screen 27, The water cooling screen is connected to the header box, the water cooling screen 29 of the ascending section and the outlet header 30 of the water cooling screen of the ascending section.

[0032]The input port of the economizer 21 inputs working medium water through a pipeline, and its output port is connected with the inlet header 22 of the furnace water wall through a pipeline...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B31/08F22B3/08
CPCF22G7/14F22B31/0015
Inventor 肖峰徐雪元姜雯雯
Owner SHANGHAI BOILER WORKS
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