Steam as Gasification Agent for Chemical Looping Combustion of Charcoal in an Annular Dual-tube Moving Bed Reactor

• Main Authors: Yi-Rou Lu, 呂易柔
• Other Authors: Young Ku
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/45944509133494743619

碩士 === 國立臺灣科技大學 === 化學工程系 === 104 === hemical looping combustion was conducted in moving bed reactor with various gasification agents, inclining steam mixture, steam/CO2 mixture, steam/O2 mixture and steam/H2 mixture. In the moving bed reactor, high fixed carbon content solid fuel, BC-charcoal, and iron-based oxygen carriers was employed with different gasification agents. Alumina and titania supported Fe2O3 were prepared to evaluate its feasibility as an oxygen carrier for chemical looping combustion. Fe2O3/Al2O3 oxygen carriers were prepared by wet shear granulation preparation and showed better reactivity and recyclability thermogravimetric analysis, crush strength and attrition rate. In this research, BC-charcoal gasification was conducted with various gasification agents at various operational temperatures and gasification agent flow rates to gain high quality syngas produce and determined better operational condition for BC-charcoal combustion in an empty bed reactor. The fuel conversion was increased with increasing operational temperature and gasification agents flow rate in the empty bed reactor. BC-charcoal combustion was successfully carried out in the moving bed fuel reactor with various gasification agents and mostly 100 % yield of carbon dioxide was obtained in all case. Using steam/H2 mixture was reached higher oxygen carriers conversion; furthermore, the reduced Fe2O3/Al2O3 oxygen carriers were capable for hydrogen generation. By analysis of system processing capacity, 20-30% of output processing capacity is acquired for gasification process and other energy could employ for external facility. When steam/O2 mixture and steam/H2 mixture were used for BC-charcoal combustion, it was not acquired extra output processing capacity.