气泡修正多尺度曳力模型的鼓泡流化床生物质气化分析  

Analysis of biomass gasification in bubbling fluidized bed with a revised bubble-based energy minimization multiscale drag model

作　　者：陈巨辉[1,2] 殷维杰 王帅[3] 于广滨[1] 胡汀 林枫 

机构地区：[1]哈尔滨理工大学机械学院,黑龙江哈尔滨150080 [2]哈尔滨第703研究所燃气轮机室,黑龙江哈尔滨150036 [3]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001

出　　处：《化工进展》2017年第4期1224-1230,共7页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(51406045);中国博士后自然科学基金(2016M590122);哈尔滨理工大学青年拔尖创新人才培养计划(201504)项目

摘　　要：以双流体模型为框架,气泡修正多尺度曳力模型描述介观尺度作用影响,结合化学反应动力学方法建立生物质气化模型,模拟了鼓泡流化床内生物质气化过程。采用气泡修正多尺度曳力模型考虑了介观尺度影响,使气固异相反应增强,模拟结果更接近实验值。模拟结果给出了颗粒浓度、速度矢量瞬时分布、气体组分摩尔分数瞬时分布及碳和灰分的质量分数瞬时分布特性。分析了氧当量比对鼓泡流化床生物质气化过程的影响。总体上,气体产量随着氧当量比的增加而减小。经分析得出,H_2和CH_4的产量与氧当量比有着较高的相关性,拟合优度都在0.99以上;对于CO和CO_2,则用三次多项式拟合时能有较好拟合优度。并且,CO随着氧当量比的增加先下降较快,然后平缓,最后再次较快下降。而CO_2的下降趋势则与CO正好相反,先平缓,后下降快,最后再次平缓。Based on the framework of two-fluid model, a revised bubble-based energy minimization multiscale （EMMS） drag model was proposed. Incorporating chemical kinetics method, the biomass gasification model was presented for simulating the biomass gasification process in the bubbling fluidized. The simulations with Bubble-based EMMS drag model that accounted for the effect of bubble in mesoscale which enhances the heterogeneous reaction between gas phase and solid phase were in good agreement with the experimental data. The simulation results provided the distributions of particles concentration, velocity vector, molar fractions of gas phase, and mass fractions of carbon and ash. The effect of equivalence ratio on biomass gasification process in the bubbling fluidized bed was analyzed. In general, the gas products tend to decrease with the increase of equivalence ration. Analysis found that the production of H2 and CH4 has strong correlation with the equivalence ratio with goodness of fit （adj. R2） above 0.99. As for CO and CO2, their correlations with the equivalence ratio can be better predicted by cubic polynomials. And, CO first decreases significantly as equivalence ratio increases, then becomes fiat and finally decreases afterwards. C02, however, follows the opposite trend.

关 键 词：气泡修正多尺度曳力模型 双流体模型 氧当量比 生物质气化 鼓泡流化床 

分 类 号：O359[理学—流体力学]