System and method for improving preparation speed and efficiency of solar thermo-chemical fuel

Abstract

The invention discloses a system and method for improving the preparation speed and efficiency of a solar thermo-chemical fuel. The system comprises a condensation device (a), a contact heat exchange device (b), a reactor (c), an oxygen collecting device (d), a heat exchanger (e) and a gas separation and collecting device (f). Compared with a solar thermo-chemical isothermal method, the system and method for improving the speed and efficiency of preparing the fuel by solar thermo-chemical circulation have the advantages that the two methods are devoted to eliminating the loss of energy for heating a catalyst, but the temperature of the isothermal method is unchanged, and the oxidation reaction temperature is higher than that of a dual-temperature method, so that the oxygen vacancy change is relatively low when the reduced cerium oxide and H2O undergo oxidation reaction, which is unfavorable for fuel production. Through active cooling of the catalyst, the time required for each cycle of the reactor can be greatly shortened, meanwhile, more hydrogen is produced in each cycle compared with the isothermal method, moreover, the reaction rate of the oxidation step can be improved, the heat of the high-temperature reduction step is reasonably utilized, the conversion efficiency of the solar fuel is improved, use of a solid-solid heat exchanger is avoided, and the mechanical properties of the reactor are improved.

Description

technical field [0001] The invention relates to the technical field of fuel preparation by high-temperature solar thermochemical cycle dual-temperature method, especially by converting CO 2 or H 2 O to CO and H 2 A system and method for increasing the speed and efficiency of solar thermochemical fuel production. Background technique [0002] As a clean energy, hydrogen has more and more applications in industry, medicine and so on. The traditional way is to produce hydrogen through electrolysis of water or methane reforming, which undoubtedly indirectly increases the consumption of fossil energy. Today, fossil energy is increasingly depleted, and hydrogen production by combining renewable energy such as solar energy with water splitting has highlighted many advantages. In addition, the process of decomposing carbon dioxide to produce carbon monoxide can reduce greenhouse gas emissions and reduce the consumption of fossil energy, which is a supplementary method of carbon ...

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Problems solved by technology

[0025] In this case, the huge energy consumed by heating cerium oxide can be eliminated. Although the efficiency is improved compared with the traditional two-temperature method under certain conditions, because the oxidation step is an exothermic reaction, high temperature will not be conducive to the progress of the reaction.

In addition, the heat exchanger at high temperature (not lower than 1100°C) is immature, and it is difficult to recover and utilize heat

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