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Method and device for gradient utilization of heat of oxygen-enriched combustion unit

An oxygen-enriched combustion and unit technology, which is used in preheating, feedwater heaters, lighting and heating equipment, etc., can solve the problems of complex oxygen-enriched combustion systems and large optimization space.

Active Publication Date: 2013-07-10
SOUTHEAST UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The oxygen-enriched combustion system is relatively complex, and there is a large room for optimization

Method used

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  • Method and device for gradient utilization of heat of oxygen-enriched combustion unit

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] The invention relates to a heat cascade utilization method of an oxygen-enriched combustion unit, which can significantly improve the heat utilization rate of the system.

[0023] Another core of the present invention is to provide a device for implementing the above method. structured as figure 1 shown.

[0024] The heat cascade utilization method of the oxygen-enriched combustion unit provided by the present invention:

[0025] The flue gas discharged from the boiler is split to form the first part of flue gas, the second part of flue gas and the third part of flue gas.

[0026] The first part of the flue gas is used as the circulating flue gas, which is re-sent into the furnace, the second part of the flue gas is used to preheat the oxygen fed into the boiler, and the third part of the flue gas is used to heat the low-pressure feed water. ...

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Abstract

The invention discloses a method and a device for gradient utilization of the heat of an oxygen-enriched combustion unit. The method comprises the following steps of: (A) dividing the outlet smoke of a boiler (1) into a first part of smoke, a second part of smoke and a third part of smoke, feeding the first part of smoke into a hearth of the boiler (1), preheating the oxygen fed into the boiler (1) by the second part of smoke, and heating the low-pressure feed water by the third part of smoke; (B) feeding the second part of smoke and the third part of smoke into a smoke condenser (11) after heat exchange, condensing to normal temperature and feeding into a smoke compressor (8); (C) compressing air by an air compressor (5), cooling by a compressed air low-pressure feed water heater (6) and feeding into an oxygen generation system (7), and feeding the oxygen generated by the oxygen generation system (7) into an oxygen preheater (2); and (D) heating the low-pressure feed water of the boiler. According to the invention, the power generation efficiency of an oxygen-enriched combustion power station is improved, and the CO2 trapping cost of the coal-fired power plant is reduced.

Description

technical field [0001] The invention relates to a heat cascade utilization method of an oxygen-enriched combustion unit, which belongs to the cross field of energy technology and environmental protection technology. In addition, the invention also relates to a device for carrying out the above-mentioned method. Background technique [0002] The greenhouse gas CO emitted by fossil fuel combustion 2 The harm to the environment has aroused great concern all over the world. In numerous CO 2 Among the separation and capture technologies, oxyfuel combustion technology is a new type of low-cost separation and recovery of CO 2 And the new concept of combustion with low pollutant emissions has attracted the attention of researchers from all over the world. [0003] Due to the addition of the air separation subsystem and the flue gas purification and compression subsystem, the power generation efficiency of the unit is 8% to 12% lower than that of conventional units, which restric...

Claims

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Application Information

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IPC IPC(8): F22D1/00
Inventor 段伦博韩冬段钰锋向文国
Owner SOUTHEAST UNIV
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