循环流化床反应器二氧化碳捕集研究  

Study on Carbon Dioxide Capture in Circulating Fluidized Bed Reactors

作　　者：于广滨[1,2] 陈巨辉[1] 戴冰[1] 高德军[1] 

机构地区：[1]哈尔滨理工大学机械动力工程学院,哈尔滨150080 [2]哈尔滨工业大学化工学院,哈尔滨150001

出　　处：《机械工程学报》2015年第2期155-160,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51406045);科技部国际合作(2014DFA70400);黑龙江省自然科学基金重点(ZD20140139);黑龙江省自然科学基金(E201441)资助项目

摘　　要：采用固体吸收剂对二氧化碳进行捕集是一种简单有效的方法。基于双流体模型,采用考虑颗粒聚团结构影响的能量最小多尺度曳力模型(Energy minimization multi-scale method,EMMS)计算气固相间曳力作用。以碳酸钾作为固体吸收剂,结合化学反应动力学理论,建立碳酸钾吸收二氧化碳过程的化学反应模型。以YI等的流化床试验台为模拟对象,对循环流化床二氧化碳吸收器内二氧化碳捕集过程进行模拟研究。模拟得到不同曳力模型对二氧化碳去除率的影响,发现采用EMMS曳力模型更接近试验数据。模拟给出颗粒体积分数、二氧化碳组分质量分数及固体温度分布特性。分析水蒸气质量分数、反应器高度以及操作压力对二氧化碳去除率的影响。结果表明,随着水蒸气质量分数及反应器高度的增加,二氧化碳去除率得到明显提高;而操作压力的增加使得二氧化碳的去除率有所降低。The dry sorbent technology for carbon dioxide capture is a common and efficient method to remove CO2 from flue gases. On the basis of two-fluid model, the energy minimization multi-scale （EMMS） model is present by considering the effect of clusters to calculate the inter-phase drag coefficient. The potassium carbonate pellets are used as dry sorbents. Combined with chemical reaction kinetics theory, the reaction model is present for the process of sorption reaction of CO2. The simulation based on the experiment by YI et al. is performed in circulating fluidized bed absorbor for carbon dioxide capture process. The predicted results are in a better agreement with experimental results by EMMS method. The simulation results also give the distribution characteristics of solid concentration, CO2 concentration and solid temperature. The effects of water vapor content, reactor height and operating pressure on CO2 removal are investigated. The results indicate that CO2 removal will be enhanced with increasing the water vapor content and reactor height, and decreasing the operating pressure.

关 键 词：二氧化碳吸收 数值模拟 循环流化床 

分 类 号：TK229[动力工程及工程热物理—动力机械及工程]