Methanation system and method for solar thermochemical cycle hydrogen production

Abstract

The invention relates to a methanation system and method for solar thermochemical cycle hydrogen production. The system comprises a thermochemical cycle hydrogen production module, wherein water and cerium oxide are taken as raw materials to realize thermochemical cycle hydrogen production, and then high-temperature hydrogen and high-temperature oxygen are generated; a high-temperature gas waste heat recovery module, wherein the high-temperature gas waste heat recovery module is used for receiving the high-temperature hydrogen and the high-temperature oxygen generated by the thermochemical cycle hydrogen production module for power generation; and a biological methane module, wherein the biological methane module takes industrial waste gas and low-temperature hydrogen subjected to waste heat recovery as input, and the high-temperature gas waste heat recovery module is used for generating power to provide a voltage environment to generate methane gas. Compared with the prior art, the method has the advantages of simple operation process, energy conservation, consumption reduction, lower investment cost and operation cost, environmental friendliness, capability of preparing high-quality methane gas suitable for wide application, and the like.

Description

technical field [0001] The invention relates to the technical field of new energy utilization, in particular to a methanation system and method for solar thermochemical cycle hydrogen production. Background technique [0002] In response to climate change, in September 2020, at the 75th session of the United Nations General Assembly, China proposed the goals of carbon peaking by 2030 and carbon neutrality by 2060. As the world's largest developing country and carbon emitter, it is in the stage of rapid industrialization and urbanization, with rapid economic growth and large energy demand. The coal-based energy system and high-carbon industrial structure make my country's carbon emissions The total amount and intensity are both high. It will take less than 10 years to achieve carbon peak and another 30 years to achieve carbon neutrality. The task is very arduous. The extensive development and use of fossil energy is the root of the carbon emission problem. Accelerating the pr...

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Problems solved by technology

But there is a problem: after ZnO is reduced, if the oxygen produced is not separated in time, it will be oxidized again to form ZnO. In addition, in the reduction reaction, the generated ZnO will cover the surface of Zn, affecting the reaction rate and hindering the generation of hydrogen.

This scheme uses zinc oxide as a carrier. After zinc oxide is reduced, if the oxygen produced is not separated in time, it will be oxidized again to form zinc oxide. In addition, during the reduction reaction, the generated zinc oxide will cover the surface of zinc, affecting the reaction rate and hindering hydrogen generation

At the same time, there are some irreversible losses such as secondary radiation loss and quenching loss

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