生物质与石油焦共气化特性的研究

Study on characteristics of co-gasification of biomass and petroleum coke

在内径为50mm,高约950mm的固定床反应器上对生物质与石油焦共气化特性进行了研究。研究了气化模式、石油焦添加比例、添加方式、粒径大小及气化温度对气化效果及焦油量的影响。结果表明,石油焦可以起到催化裂解生物质焦油的作用。随着氧气的体积分数从2%增加到15%时,气体的热值从5.35M J/m3降低到2.98M J/m3。在气化温度为700℃时,四种氧气含量下生物质单独气化时焦油产率平均值为6.4%,气体热值为4.31M J/m3;生物质和石油焦混合气化时焦油产率平均值为2.9%,气体热值为5.19M J/m3。石油焦的最佳添加比例为1∶1。生物质和石油焦不混掺焦油的产率最大,混掺其次,石油焦提前加入效果最好。随着添加石油焦粒径的增大,石油焦对生物质气化焦油的裂解率逐渐降低。在两种气化模式下,随着气化温度的升高,焦油的产率均逐渐降低。

The gasification experiments of co-gasification of biomass and petroleum coke were conducted in a fixed-bed reactor to determine the effect of the gasification mode, mix mode and proportion, particle size of petroleum coke on the tar yield and gas heat value, which was intended to provide the support for the idea of decoupled dual fluidized bed co-gasification of biomass and petroleum coke. The results show that the gas heat value decreases from 5.35 MJ/m3 to 2.98 MJ/m3 with the increasing of oxygen content from 2% to 15%. The average tar yield is 6.4%, and gas heat value is 4.31 MJ/m3 as biomass is gasified alone at 700 ℃. For the co- gasification, the average tar yield is 2.9%, and gas heat value is 5.19 MJ/m3. At the temperature of 700℃, the best ratio of the petroleum coke to biomass is 1：1 as the oxygen content is 4%. The largest tar yield is produced for the gasification with petroleum coke alone, and the smallest tar yield for the co-gasification with feeding the petroleum coke first. With the increasing particle size of petroleum coke, the tar decomposition rate decreases gradually. The tar yield decreases with temperature for any case.