Zero-discharge hydrogen-electric co-production system

Abstract

The invention discloses a zero-discharge hydrogen-electric co-production system which comprises a supercritical carbon dioxide circulation subsystem, a natural gas steam reforming hydrogen productionsubsystem and an air oxygen production subsystem. Direct-fired heating supercritical carbon dioxide circulation power generation is performed, turbine exhaust high-temperature segment heat is used fora natural gas steam reforming hydrogen production process, hydrogen production tail gas and supplementary natural gas mixed gas serves as a combustor fuel, an air device provides pure oxygen, all carbon dioxide generated by combustion is captured, all water is recycled, and NOx gas discharge is omitted. Fuel consumption can be reduced by externally provided low-grade heat energy. The hydrogen-electric yield grade matching property of the system is good, the prior art is integrated, only part of equipment needs to be changed, and research input is less.

Description

technical field [0001] The invention relates to a zero-emission hydrogen-electricity cogeneration system, belonging to the technical field of energy. Background technique [0002] Hydrogen and electricity are zero-carbon and pollution-free energy carriers, both of which play an extremely important role in the energy field. With the progress of society, hydrogen energy has been paid more and more attention, and is considered to be the main body of future energy. The existing hydrogen production plant and power plant are mutually independent systems. The former mainly obtains hydrogen from hydrogen-containing substances through chemical reaction, electrolysis, thermal decomposition and other principles, and the latter mainly uses the principle of thermodynamic cycle to burn fuel and nuclear fission , solar radiation, etc. to convert heat into electricity. In recent years, research on hydrogen-power cogeneration systems has received widespread attention, including cogeneratio...

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Problems solved by technology

[0004] The supercritical carbon dioxide cycle turbine with direct combustion heating has high inlet temperature and pressure, but the turbine expansion ratio is small. Under the optimal expansion ratio, the exhaust gas temperature of the turbine can reach above 900°C. If it directly enters the regenerator, it will As a result, the temperature at the hot end of the high-pressure side of the regenerator is too high, and the allowable stress of the material is difficult to meet the requirements, so the expansion ratio has to be increased, which requires additional compression equipment, and also causes loss of cycle efficiency

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