双流化床生物质气化动力学建模与分析  

Kinetic Modeling and Analysis of Biomass Gasification in a Dual Fluidized Bed

作　　者：诸林[1] 范峻铭[1] 张政[1] 蒋鹏[1] 

机构地区：[1]西南石油大学化学化工学院,四川成都610500

出　　处：《过程工程学报》2013年第5期836-840,共5页The Chinese Journal of Process Engineering

摘　　要：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0-0．5m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0．5m后，气化反应基本完成.In order to further study the distribution of synthesis gas concentration in the biomass gasifier of a dual fluidized bed, the two-phase modeling was developed by dividing the bubbling fluidized bed into bubble and emulsion phases, and the mass and heat balance for the two-phases were accounted based on the kinetic rate equations. The simulated values agreed with the experimental data. The effects of ratio of steam to biomass （S/B） and gasification temperature on the composition of synthesis gas were studied. The results showed that the CO content increased with the increase of gasification temperature, and H2 and CO2 contents decreased. The water-gas shift and reforming reactions were promoted to their positive direction with the increase of S/B, leading to more consumption of CO and CH4, and generation of H2 and CO2. When S/B was 0-1.2, the ratio of CO to H2 changed 44%, which indicated that the water-gas shift was the main reaction with the increase of S/B. The profiles of syngas composition along the gasifier height were further analyzed at the gasification temperature 870 ℃ and S/B 0.75. When the gasifier height was less than 0.5 m, the H2O content decreased sharply, and the molar concentration of H2 increased steeply, and the CO and CO2 contents increased gradually. When the gasifier height was more than 0.5 m, the gasification reactions were inclined to equilibrium.

关 键 词：双流化床 生物质 气化 两相模型 动力学 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]