【摘要】 以空气为气化介质,在中型流化床反应器上进行了生物质(木屑)气化实验研究。考察了当量比ER(0.20～0.34)、气化温度(670～820℃)对气化结果的影响,初步探讨加入二次风对气化的影响。在实验研究的条件范围内,煤气热值在5650～6665kJ/m3范围内变化,生物质产气率在1.51～2.26m3/kg之间变化,碳转化率在74.3%～90.8%之间变化,气化效率达到61.8%～78.1%;加入适量二次风可以提高气化效率和碳转化率,减少焦油含量。实验结果表明:此流化床气化炉当气化温度在720～770℃之间,当量比ER在0.24～0.28之间时,气化效果最好,此时煤气热值可达到6400～6600kJ/m3,产气率为1.75～1.95m3/kg,碳转化率为83%～89%,气化效率高达71%以上。更多还原

【Abstract】 The characteristics of biomass(wood powder)gasification with air in a medium fluidized bed gasifier were studied through a series of experiments.The influence of equivalence ratio(0.2～0.34),temperature(670～820℃)and secondary air in freeboard of the gasifier on gas lower heating value,gas yield,carbon conversion efficiency and gasification efficiency were investigated.The results showed that the gas yield ranges between 1.51m3/kg and 2.26m3/kg biomass and the lower heating value of produced gas ranges between 5650kJ/m3 and 6665kJ/m3.The carbon conversion efficiency and gasification efficiency were 74.3%～90.8% and 61.8%～78.1%,respectively.The experiment results indicated that the optimal operational conditions are as following,equivalence ratio:0.24～0.28;temperature:720～770℃;lower heating value of produced gas:6400～6600kJ/m3;gas yield:1.75～1.95m3/kg;carbon conversion efficiency:83%～89%;gasification efficiency:over 71%.The experiment results also showed that the addition of 10% of secondary air can improve the lower heating value,gas yield,the carbon conversion efficiency and gasification efficiency and reduce tar content.更多还原