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为进一步研究双流化床生物质气化器中合成气含量分布,将气化器鼓泡床层分为气泡相和乳化相,依据动力学反应分别进行各相质量和热量衡算,计算结果与实验值吻合较好.随气化温度升高,CO含量增加,而H2和CO2含量降低;蒸汽与生物质质量比(S/B)增加促进水蒸汽变换和重整反应,消耗CO和CH4,生成H2和CO2,当S/B从0变化到1.2时,CO/H2变化44%,说明S/B增加主要促进了水蒸汽变换反应.气化温度870℃及S/B=0.75条件下,当气化器高度为0~0.5 m时,H2O含量急剧下降,H2含量急剧上升,CO与CO2含量逐渐上升,当该高度大于0.5 m后,气化反应基本完成.
In order to further study the distribution of syngas content in a two-fluidized bed biomass gasifier, the bubbling bed of the gasifier is divided into a bubble phase and an emulsion phase, and the mass balance and heat balance are calculated respectively according to the kinetic reaction. Which is consistent with the experimental data.When the gasification temperature is increased, the contents of CO and CH4 increase while the content of H2 and CO2 decreases.The steam / biomass mass ratio (S / B) increases to promote the steam reforming and reforming reactions, , And H2 and CO2 were generated. When the S / B was changed from 0 to 1.2, the CO / H2 change was 44%, indicating that the increase of S / B mainly promoted the steam reforming reaction.When the gasification temperature was 870 ℃ and S / B = 0.75 When the gasifier height is 0 ~ 0.5 m, the content of H 2 O decreases sharply, the content of H 2 increases sharply, and the content of CO and CO 2 increases gradually. When the height is greater than 0.5 m, the gasification reaction is basically completed.