Hydrodynamic analysis of a three-fluidized bed reactor cold flow model for chemical looping hydrogen generation: pressure characteristics
Chemical looping hydrogen generation (CLHG) can produce pure hydrogen with inherent separation of CO2 from fossils fuel.The process involves a metal oxide,as an oxygen carrier,such as iron oxide.The CLHG system consists of three reactors: a fuel reactor (FR),a steam reactor (SR) and an air reactor (AR).In the FR,the fuel gases react with iron oxides (hematite Fe2O3,magnetite Fe3O4,wuestite FeO),generating reduced iron oxides (FeO or even Fe),and with full conversion of gasous fueles,pure CO2 can be obtained after cooling the flue gas from the fuel reactor;in the SR,FeO and Fe reacts with steam to genearte magnetite (Fe3O4) and H2,the latter representing the final target product of the process;in the AR,the magnetite is oxidized back to hematite which is used in another cycle. A cold flow model of three-fluidized bed for CLHG corresponding to 50KW hot units has been built.A major novelty of this facility is the compact fuel reactor,which integrates a bubble and a fast fluidized bed to avoid the incomplete conversion of the fuel gas caused by the thermodynamics equilibrium.In order to study the pressure characteristics and the solids concentration of the system,especially in the fuel reactor,the gas velocity of three reactors,gas flow of L-type value,total solids inventory (TSI) and the secondary air of fuel reactor were varied.Results show that the pressure and the solids concentration are strongly influenced by the fluidizing-gas velocity of three reactors.Moreover,the entrainment of the upper part of fuel reactor increases as the total solids inventory increases,and the operating range of the FR can be changed by introducing secondary air or increasing the total solids inventory.
hydrogen production cold flow chemical-looping CO2 separation three-fluidized bed reactor
Zhipeng Xue Wenguo Xiang Shiyi Chen Dong Wang
School of Energy and Environment,Southeast University,Nanjing 210096,China
国际会议
The 7th International Symposium on Coal Combustion(第七届国际煤燃烧学术会议)
哈尔滨
英文
878-884
2011-07-19（万方平台首次上网日期，不代表论文的发表时间）