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Boiler system of circulating fluid bed burning in oxygen enrichment

A circulating fluidized bed and oxygen-enriched combustion technology, which is applied in the direction of fluidized bed combustion equipment, combustion type, combustion method, etc., can solve the problems of preheater gas leakage, large gas flow rate, and large boiler volume, etc., and achieve flue gas The effect of flow reduction, avoiding gas leakage, and improving desulfurization efficiency

Inactive Publication Date: 2007-05-09
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, O 2 / CO 2 The combustion boiler system only replaces the nitrogen in the air with the flue gas at the tail of the boiler. The volume share of oxygen is basically unchanged, and there is still a large part of the gas that cannot participate in the combustion. The gas flow is very large, making the volume of the boiler relatively large. higher cost
In addition, the temperature in the furnace is difficult to control, and the preheater is prone to gas leakage

Method used

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  • Boiler system of circulating fluid bed burning in oxygen enrichment

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Embodiment Construction

[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] As shown in Figure 1, the structure of an embodiment of the oxygen-enriched combustion circulating fluidized bed boiler system of the present invention is that the circulating fluidized bed furnace 1, the lower exhaust cyclone separator 2 and the tail convection heat exchanger 3 are connected in sequence, and the tail The convection heat exchanger 3, the pre-heater 4, the dedusting and desulfurization device 5 and the gas cooler 6 are connected in sequence, and the gas cooler 6 is connected with the CO by the induced draft fan 13, the first gas flow regulating valve 16 2 The recovery device 7 is connected, the gas cooler 6 is connected with the pre-heater 4 through the induced draft fan 13, the first gas flow regulating valve 16, the second gas flow regulating valve 17, and the flue gas recirculation fan 14, and the gas cooler 6 is connected with the pr...

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Abstract

A circulation fluidized-bed boiler of rich-oxygen combustion type is prepared as utilizing circulation fluidized-bed boiler with external fluidized bed heat exchanger to carry out combustion in mode of mixing mixture gas of high concentration oxygen from air separate and recirculation smoke from boiler tail with fuel, controlling load and firepot temperature of said boiler by regulating flow rate of fly ash particles entering into external fluidized bed heat exchanger.

Description

technical field [0001] The invention relates to an oxygen-enriched combustion circulating fluidized bed boiler system, which is mainly suitable for burning coal and other solid fuels with carbon as the main component. Background technique [0002] At present, most boilers at home and abroad use air as the fuel oxidant, and the flue gas generated by combustion is discharged to the atmosphere after certain treatment. Although air is available everywhere, no special preparation equipment is required, but due to the N in the air 2 Can not participate in combustion, and take away part of the heat generated by combustion, thus increasing the heat loss of exhaust smoke; at the same time, N 2 During the combustion process, it will be oxidized to produce nitrogen oxides that pollute the environment. In addition, when burning carbon-based solid fuels such as coal, the flue gas produced contains the greenhouse gas CO 2 , cannot be discharged directly to the atmosphere, and CO 2 Sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/18F23C13/00F23L7/00
CPCY02E20/34
Inventor 陈汉平王静张世红王贤华杨海平郑楚光
Owner HUAZHONG UNIV OF SCI & TECH
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