Coal-fired gas power generation system

A power generation system and coal gas-fired technology, applied in steam generation, machines/engines, steam generation methods using heat carriers, etc., can solve the problems of low steam extraction rate, low power generation cycle efficiency, high loss of cold source, etc., to achieve cold Low source loss, improved power generation cycle efficiency, and increased gas extraction

Pending Publication Date: 2018-12-28
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0003] Aiming at the problems of low steam extraction rate, high cold source loss and low power generation cycle efficiency in the existing gas boiler power generation system,

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  • Coal-fired gas power generation system

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Embodiment Construction

[0033] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0034] A gas-fired power generation method, comprising the steps of:

[0035] 1) input the coal gas into the boiler 2 through the first pipeline 25, and input the combustion-supporting air into the boiler 2 at the same time, so that the coal gas is burned in the boiler 2, and the combusted flue gas is discharged to the outside of the boiler 2 through the gas outlet pipe;

[0036] 2) Through the third pipeline 27, the liquid water is input to the pipeline in the boiler 2, and the water absorbs the combustion heat of the gas in the boiler 2 and forms water vapor, and the water vapor is passed into the steam turbine 9, and the generator 14 is connected to the steam turbine 9. Driven to generate electricity; the exhausted steam discharged from the steam turbine can be condensed to form water to re-enter the third pipeline 27, or it can be discharged d...

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Abstract

The invention discloses a coal-fired gas power generation system, comprising a steam turbine, a power generator, a boiler, as well as an economizer, an air preheater and a superheater installed in theboiler. The steam extraction of the steam turbine is transmitted to the preheater and serves as a heat source of the preheater, and the preheater preheats the gas in a first pipeline. As the air extraction amount is increased, the loss of a cold source is low, and the power generation cycle efficiency is improved; the regenerative heat is used for heaing the gas, and the regenerative heat is finally used for raising the theoretical combustion temperature of the gas, and the heat energy is raised to very high grade from very low grade, and therefore heating the gas with the regenerative heat has a greater thermodynamic significance in improving the quality of the power generation cycle. The raise of theoretical combustion temperature of gas increases the radiant heat transfer share of a boiler, and decreases and the metal consumption of the boiler to some extent.

Description

technical field [0001] The invention belongs to the technical field of gas-fired power generation, and in particular relates to a gas-fired power generation system. Background technique [0002] Existing gas-fired power generation systems all use steam extraction to preheat the feed water, which is the so-called regenerative heating cycle to reduce the loss of cold source. However, due to the limited heat capacity of the feed water, the amount of gas extraction is restricted, resulting in low efficiency of gas power generation, such as blast furnaces with high-pressure parameters The power generation cycle efficiency of the gas boiler is only about 38%. One of the reasons for the low power generation efficiency of the power generation system is that although the gas boiler power generation system with high parameters uses the heat recovery cycle of extracting steam to heat the feed water to reduce the loss of the cold source and improve the cycle efficiency, However, due to ...

Claims

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Application Information

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IPC IPC(8): F01K11/02F01D15/10F22B1/18F22D1/02
CPCF01D15/10F01K11/02F22B1/18F22D1/02
Inventor 王子兵张玉柱邢宏伟王乙竹
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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