Chemical chain hydrogen production device and method based on iron-based oxygen carrier graded reduction

Abstract

The invention discloses a chemical chain hydrogenation device and a chemical chain hydrogenation method based on iron-based oxygen carrier graded reduction. The device is a circulation loop composed of an air reactor, a cyclone separator, a reduction reactor, a fuel reactor, a return feeder, a steam reactor, and an isolator. According to the method, a Fe3O4-state iron-based oxygen carrier is oxidized into a Fe2O3-state iron-based oxygen carrier with air in the air reactor; separation is carried out in the cyclone separator; the Fe2O3-state iron-based oxygen carrier enters the reduction reactor, and is reduced into Fe3O4-state iron-based oxygen carrier with weakly reductive gas; the Fe3O4-state iron-based oxygen carrier enters the fuel reactor through a discharge pipe of the reduction reactor, and is reduced to FeO-state iron-based oxygen carrier with a gaseous fuel; the FeO-state iron-based oxygen carrier enters the steam reactor through the return feeder, and is subjected to a reaction with steam, such that the FeO-state iron-based oxygen carrier is converted into a Fe3O4-state iron-based oxygen carrier, and at a same time hydrogen is produced and is discharged through a hydrogen discharge pipe of the steam reactor; the Fe3O4-state iron-based oxygen carrier enters the air reactor through the isolator, and is subjected to an oxidation reaction with air, such that the regeneration of the Fe2O3-state iron-based oxygen carrier is completed.

Description

technical field [0001] The invention relates to a gas fuel chemical chain hydrogen production device and method, in particular to realize the grading reduction of iron-based oxygen carriers, improve the hydrogen production efficiency and gas fuel conversion efficiency, and achieve a chemical chain hydrogen production device for separating carbon dioxide in the hydrogen production process and methods. Background technique [0002] Chemical chain hydrogen production is a new type of hydrogen production technology. Gas fuel is not directly contacted with water vapor to produce hydrogen through water-gas shift reaction, but alternates between air reactor, fuel reactor and steam reactor through oxygen carrier. The oxidation-reduction reaction realizes the transfer of oxygen and the hydrogen production reaction, and completes the conversion of chemical energy of gas fuel. The principle is: the oxygen carrier in the oxidized state undergoes a reduction reaction with the gaseous fu...

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Problems solved by technology

[0004] The moving bed is used as the fuel reactor, and the reducing gas flows upward and contacts the oxidized oxygen carrier particles moving downward, which can deeply reduce the oxygen carrier. However, due to the deep reduction of the oxygen carrier in the moving bed fuel reactor, it is easy to produce Particle agglomeration and carbon deposition on the surface of oxygen carrier particles make the oxygen carrier particles unable to flow normally, and the carbon deposited oxygen carrier particles enter the steam reactor, and the carbon deposits will react with water vapor to produce CO, which affects the steam reactor H 2 product purity

[0005] Using a fluidized bed as a fuel reactor can solve the problems of agglomeration of oxygen carrier particles and carbon deposition on the surface of oxygen carrier particles in a moving bed fuel reactor. The deeper the reduction degree of oxygen gas, the higher the concentration of incompletely converted combustible gas in the outlet gas of the fluidized bed fuel reactor, resulting in the lower conversion efficiency of gaseous fuel

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