Method and device for synergic catalytic cycle hydrogen production and carbon dioxide trapping on basis of CaFe2O4/Ca2Fe2O5

Abstract

The invention discloses a method and a device of synergic catalytic cycle hydrogen production and carbon dioxide trapping on the basis of CaFe2O4 / Ca2Fe2O5. The method prepares high-purity hydrogen andtraps carbon dioxide by a one-step reaction of CaFe2O4 and Ca2Fe2O5 composite calcium iron powder, and the reaction occurs circularly. The device is a folded circulating fluid bed or a nested fluid bed. The method and the device have the following advantages that: the method of the synergic catalytic cycle hydrogen production and the carbon dioxide trapping on the basis of CaFe2O4 / Ca2Fe2O5 produces the hydrogen by the one-step reaction; carbon dioxide and the high-purity hydrogen can be trapped at the same time; a CaFe2O4 and Ca2Fe2O5 oxygen carrier adopted by the method has higher strengththan an iron-based oxygen carrier and a calcium-based oxygen carrier used independently; the utilization in the fluid bed is facilitated; the reaction time is shorter; the deactivation possibility islow; the prepared hydrogen is high in purity; the folded circulating fluid bed and the nested circulating fluid bed are simple in structure and can effectively trap carbon dioxide and the high-purityhydrogen.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide capture, and relates to a chemical chain hydrogen production technology, specifically a CaFe-based 2 o 4 / Ca 2 Fe 2 o 5 A method and device for catalytic cycle hydrogen production and co-capture of carbon dioxide. Background technique [0002] The basic principle of chemical chain hydrogen production is to decompose the traditional combustion of fuel in direct contact with air into two gas-solid reactions with the help of an oxygen carrier. The fuel and air do not need to be in contact, and the oxygen carrier will Oxygen from the air is transferred to the fuel. [0003] In the previous chemical chain hydrogen production process, it was divided into gas fuel and solid fuel hydrogen production. The gas fuel hydrogen production process mainly used iron-based oxygen carrier, and the solid fuel hydrogen production process mainly used iron-based or Calcium-based oxygen carrier. Chemical ch...

AI Technical Summary

Problems solved by technology

[0004] Among them, the fuel conversion efficiency and carbon dioxide removal efficiency of iron-based oxygen carriers are low, the reaction time is long, three-step chemical reactions are required, and the structure of the reaction device is relatively complicated.

The structural strength of the calcium-based oxygen carrier is weak, and the surface is easy to sinter, which will easily lead to the deactivation of the calcium-based catalyst after multiple cycles of catalysis

Images