上吸式秸秆气化炉中当量比对气化特性的影响

Effect of Equivalence Ratio on Gasification Characteristics in a Straw Updraft Gasifier

我国拥有丰富的农作物废弃物生物质资源,生物质气化技术是洁净高效利用生物质能的有效途径。以自行研制的上吸式秸秆气化炉为研究对象,通过实验研究的方法,研究了当量比Φ对该气化炉气化特性的影响。结果表明:在实验工况下,最佳气化当量比Φ为0.25~0.3,此时气化区平均温度在950℃,秸秆气化煤气低位热值平均可达5.98MJ/m3(标准立方米),气化强度达到137.7kg/(m2·h),产气率为1.68m3/kg,碳转化率为86.4%,气化效率为73.3%。当Φ<0.3时,气化煤气焦油含量随Φ增加较缓慢,但当Φ>0.3后,煤气焦油含量迅速提升。

China produces abundant biomass waste during agriculture process, and biomass gasification technology is a clean and high efficient way to use biomass energy. Using a self-developed updraft gasifier as carrier, the effect of equivalence ratio Φ on gasification characteristics was studied through experimental methods in an updraft gasifier. The results obtained show that the optimal value of Φ is between 0.25 and 0.3 under the experimental condition, the mean temperature in gasification reaction zone can reach 950℃, heating value of 5.98 MJ/m3, gasification intensity of 137.7 kg/(m2·h), gas production rate of 1.68 m3/kg, carbon conversion rate of 86.4%, and 73.3% for the overall gasification efficiency. The tar content in gas increase slowly with increasing equivalence ratio when Φ is below 0.3, but the tar content increase rapidly when Φ is above 0.3.