Design And Test Of A Hydrogen Production System Based On Chemical Looping Combustion Theory

The shortage of resource and climate change were global problem, and attention was taken to chemical looping combustion for the inherent CO2 separation. An effective way to clean use of energy was combined hydrogen production and chemical looping combustion. In this paper, a system of hydrogen production with CO2 zero emission based on chemical looping combustion was proposed, which can obtain clean hydrogen with near zero emission of carbon dioxide and can supplied energy itself.Firstly, the oxygen carrier Fe2O3/Al2O3 was prepared by impregnation methods. And the texts were carried out in the fluidized bed reactor of quartz, which CO was used as fuel. The results suggested the reactivity of oxygen carrier was influenced by temperature. The carbon was likely to deposit when temperature was below750℃. High temperature can avoid carbon deposition, but caused the oxygen agglomerated, so 850℃was a good choice for this oxygen carrier. Then, Thermodynamic equilibrium and testes were researched for the feasibility of this system. The results showed that the system can supplied energy by itself, and the circulation of materiel was fulfilled in a three interconnected fluidized bed. Subsequently, the experiment setup of hydrogen production with CO2 zero emission based on chemical looping combustion was designed and built. Then a series of experiments were carried out. The resistance characteristics curves of the distribution plates, the critical fluidization velocity, and pressure drop of system were obtained. These showed some important information or further study. The experiments of gasification was carried our in this setup. And the results suggested when biomass was gasified with air in the gasification reactor, the H2 fraction in the produced gas was between 4-5% at 700℃, and the heat value of produced gas was between 4000-5000kJ/m3; Both H2 fraction and the heat value of produced gas were increased. When biomass was gasified with steam gasification at 700℃in the gasification reactor, the H2 fraction in the produced gas was about 13%, and the H2 fraction in the produced gas was about 18% at 800℃.