The raw material requirements for the indirect liquefaction of biomass are strict. The volume ratio of H2 to CO must be greater than or equal to 1.0～2.0. The effect on biomass gasification syngas in staged-gasification of biomass was analyzed. Biomass staged-gasification system contained low temperature biomass pyrolysis furnace and high temperature entrained-flow bed. Influence factors were studied including gasification temperature and first gasification time. The result investigation contained composition of syngas, volume ratio of H2 to CO, carbon conversion ratio, gasification efficiency and tar mass concentration. Results show that staged-gasification and increasing temperature can enhance the volume ratio of H2 to CO. The optimum condition of staged gasification was the first gasification time at 0.6 s and gasification temperature at 1 100 ℃. The result was best in the conditions. Gasification efficiency was up to 75%, the volume ratio of H2 to CO reached the maximum at 1.22, and carbon conversion was up to 96.3%. The tar mass concentration was decreased from 5.46 g/m3 to 50 mg/m3.
［1］ 仇松柏.利用生物质基合成气制备清洁生物燃料的研究［D］.合肥:中国科技大学,2010: 16-18.
QIU Song-bai. Study on production of clean biofuel using bio-syngas ［D］. Hefei: University of Science and Technology of China, 2010: 16-18.
［2］ GAHLY M, PISKORZ J, SCOTT D S, et al. The hydro gasification of wood ［J］. Industrial and Engineering Chemistry Research, 1988, 27(2): 256-264.
［3］ 吴创之,徐冰,罗曾凡,等.生物质中热值气化装置设计与运行［J］.太阳能学报,1997, 18(1): 16.
WU Chuang-zhi, XU Bing, LUO Zeng-fan, et al. Design and operation of a biomass gasifier producing MHV fuel gas ［J］. Act a Energiae Solaris Sinica, 1997, 18(1): 16.
［4］ LOPAMUDRA D, KRZYSZTOF J P, JANSSEN F J. A review of the primary measures for tar elimination in biomass gasification processes ［J］. Biomass and Bioenergy, 2003, 24(2): 125-140.
［5］ 刘玉环,朱普琪,王允圃.生物质气化焦油处理技术的最新研究进展［J］.现代化工, 2013, 33(11): 24-27.
LIU Yu-huan, ZHU Pu-qi, WANG Yun-pu, et al. Advance in tar removal technology of biomass gasification ［J］. Modern Chemical Industry, 2013, 33(11): 24-27.
［6］ HENRIKSEN U, AHRENFELDT J, JENSEN T K, et al. The design, construction and operation of a 75 kW two-stage gasifier ［J］. Energy, 2006, 31(10/11): 1542-1553.
［7］ WOLF B. Entrained-flow gasification: the Carbo-V gasification method ［J］. Thermal Use of Solid Biomasses, 2001, 1588: 247-261.
［8］ XU Guang-wen, TAKAHIRO M, TOSHIYUKI S. Two-stage dual fluidized bed gasification: its conception and application to biomass ［J］. Fuel Processing Technology, 2009, 90(1): 137-144.
［9］ WANG Yin, YOSHIKAWA K, NAMIOKA T, et al. Performance optimization of two-staged gasification system for woody biomass ［J］. Fuel Processing Technology, 2007, 88(3): 243-250.
［10］ NGO S I, THANH D B N, LIM Y. Three-stage steady-state model for biomass gasification in a dual circulating fluidized-bed ［J］. Energy Conversion and Management, 2012,54 (1): 100-112.
［11］ PILON G, LAVOIE J M. Characterization of switchgrass char produced in torrefaction and pyrolysis conditions ［J］. BioResources, 2011, 6(4): 4824-4839.
［12］ BANG-MOLLER C, ROKNI M, ELMEGAARD B, et al. Decentralized combined heat and power production by two-stage biomass gasification and solid oxide fuel cells ［J］. Energy, 2013, 58(2013): 527-537.
［13］ 赵辉.生物质高温气流床气化制取合成气的机理试验研究［D］.杭州：浙江大学,2007: 33-34.
ZHAO Hui. Experimental and mechanism research on entrained flow gasification of biomass for syngas ［D］. Hangzhou: Zhejiang University, 2007: 33-34.
