松木屑和褐煤流化床的共气化特性

Characteristics of co-gasification of biomass and lignite in a fluidized bed

在流化床上以空气-水蒸气为气化介质,对松木屑和褐煤的共气化特性进行了试验研究。在828～928℃范围内考察了生物质掺混比例、空气当量比(ER)和水蒸气-燃料比(S/F)对气化气成分、热值、碳转化率及气化效率的影响。结果表明,在生物质掺混比例为50%时,①随着ER值从0.2增加至0.35,CO2含量增加,CO、H2、CH4和CnHm含量减少,气化气热值、碳转换率、气化效率先增加后减少,在ER=0.26时达到最大;②在ER=0.26,S/F从0增加至0.44时,CO2含量增加,CO和H2含量先增加后减少,CH4和CnHm含量减少,气化气热值、碳转化率和气化效率先增加后减少。试验结果表明,在松木屑掺混比例为50%和褐煤共气化过程中,气化气热值最高可达7819 kJ/m3。

The co-gasification characteristics of pine sawdust and lignite with air and steam as fluidizing agent was investigated in a fluidized bed.The effects of pine sawdust blending ratio,equivalence ratio（ER）,and steam/fuel ratio（S/F） on the composition and low heating valve（LHV） of fuel gas,gasification efficiency and carbon conversion rate were studied at 828℃ to 928℃.The test results showed that when blending ratio of pine sawdust was 50%,with ER increased from 0.2 to 0.35,the volume concentration of CO2increased and concentrations of H2,CO,CH4,CnHmdecreased.The LHV of fuel gas,gasification efficiency and carbon conversion rate increased at first,then decreased.The volume concentration of CO2increased with increasing S/F,the volume concentration of CH4and CnHmdecreased.And the concentrations of H2,CO,LHV of fuel gas,gasification efficiency and carbon conversion rate increased at first,then decreased.In this experiment,the maximum LHV of fuel gas reached 7819 kJ/m3 when pine sawdust blending ratio was 50%.