Supercritical carbon dioxide power generation system and method based on natural gas waste heat recovery

A carbon dioxide and waste heat recovery technology, applied in chemical instruments and methods, inorganic chemistry, chemical industry, etc., can solve the problem of not improving the efficiency of generator sets, and achieve improved waste heat utilization efficiency, reduced compression power, and good matching. Effect

Pending Publication Date: 2019-02-12
HUANENG CLEAN ENERGY RES INST
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[0003] The purpose of the present invention is to provide a supercritical carbon dioxide power generation system and method ...

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  • Supercritical carbon dioxide power generation system and method based on natural gas waste heat recovery

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Embodiment Construction

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

[0022] Such as figure 1 As shown, a supercritical carbon dioxide power generation system for natural gas waste heat recovery provided by the present invention includes an air separation device 1, a burner 2, a carbon dioxide turbine 3, a regenerator 4, a first cooler 5, a water separator 6, First carbon dioxide booster 7, second cooler 8, second carbon dioxide booster 9, carbon dioxide recovery device 10, waste heat recovery heat exchanger 11, Karina turbine 11-1, Karina regenerator 11 -2. First mixer 11-3, low pressure condenser 11-4, low pressure pump 11-5, ammonia separator 11-6, second mixer 11-7, high pressure condenser 11-8, high pressure pump 11-9 and gas-liquid separator 11-10, wherein, the oxygen outlet of air separation device 1 links to each other with the oxygen inlet of burner 2, and the outlet of burner 2 links to each other with the inlet of c...

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Abstract

The invention provides a supercritical carbon dioxide power generation system and method based on natural gas waste heat recovery. The supercritical carbon dioxide power generation system comprises anair separation device, a combustor, a carbon dioxide turbine, a heat regenerator, a water separator, a first carbon dioxide pressurization device, a carbon dioxide recovery device, a waste-heat-recovery heat exchanger, a Kalina turbine, a Kalina heat regenerator, a first mixer, an ammonia separator, a second mixer, a high-pressure condenser and a gas-liquid separator. According to the supercritical carbon dioxide power generation system, natural gas is taken as fuel, and the full capture of carbon dioxide is achieved by adopting an oxygen-enriched combustion method; in the carbon dioxide turbine, carbon dioxide expands to the subcritical state and achieves a higher expansion ratio than that the supercritical carbon dioxide Brayton cycle, so that the carbon dioxide turbine can do more workand the cycle efficiency can be improved; and during the bottom cycle, waste heat of the supercritical carbon dioxide cycle is recovered by adopting the Kalina cycle, and the concentration of a working medium changes in the working medium phase-change non-isothermal process and cycle process, so that the vaporization process and the heat-source heat release process can be matched well, the irreversible loss in the heat exchange process can be reduced, and the waste heat utilization efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of supercritical carbon dioxide power generation, and in particular relates to a supercritical carbon dioxide power generation system and method for recovering natural gas waste heat. Background technique [0002] Energy and the environment are two major problems facing the development of human society. Continuously improving the efficiency of generator sets is the eternal theme and goal of power industry research. Currently, the more commonly used power cycles include the Rankine cycle with water as the working fluid and the Brayton cycle with air as the working fluid. Conventional coal-fired power plants mainly use the Rankine cycle with water as the working fluid. At present, the initial steam parameters of the largest one-million-kilowatt coal-fired power plant have reached 31MPa and 620°C. The gas turbine mainly uses the Brayton cycle with air as the working medium. At present, the inlet gas temperatur...

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Application Information

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IPC IPC(8): F02C6/00F02C3/22F01K23/10F01K25/10C01B32/50
CPCF01K23/10F01K25/106F02C3/22F02C6/00C01B32/50Y02P20/129Y02P20/10Y02P20/54
Inventor 彭烁周贤李启明钟迪王保民
Owner HUANENG CLEAN ENERGY RES INST
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