| 气固循环流化床能量最小多尺度环核(EMMS/CA)模型 |
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| 引用本文： | 程从礼,高士秋,张忠东.气固循环流化床能量最小多尺度环核(EMMS/CA)模型[J].化工学报,2002,53(8):804-809. |
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| 作者姓名： | 程从礼 高士秋 张忠东 |
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| 作者单位： | 中国科学院过程工程研究所多相反应开放研究实验室 |
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| 基金项目： | 中国科学院留学经费择优支持基金，教育部留学回国人员科研启动基金资助项目 |
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| 摘 要： | 通过对核区和环区分别建立相应的流体速度表达式改进了能量最小多尺度 (EMMS)径向流动模型 ,使模拟计算结果更趋合理 .将EMMS模型和环核 (CA)模型结合起来 ,建立了能量最小多尺度环核 (EMMS/CA)模型 ,通过EMMS模型的解可以使求解困难的CA模型得到封闭解 .运用该模型可以计算气固循环流化床中空隙率、流体速度、颗粒速度、滑移速度等动力学参数的二维分布 .模型计算值与文献报道的实验值符合较好
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| 关 键 词： | 气固循环流化床 能量最小 多尺度 滑移速度 环核结构 径向流动模型 |
| 文章编号： | 0438-1157(2002)08-0804-06 |
| 修稿时间： | 2000年10月24 |
ENERGY-MINIMIZATION MULTI-SCALE CORE-ANNULUS (EMMS/CA) MODEL FOR GAS-SOLID CIRCULATING FLUIDIZED BEDS |
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| CHENG Congli,GAO Shiqiu,ZHANG Zhongdong.ENERGY-MINIMIZATION MULTI-SCALE CORE-ANNULUS (EMMS/CA) MODEL FOR GAS-SOLID CIRCULATING FLUIDIZED BEDS[J].Journal of Chemical Industry and Engineering(China),2002,53(8):804-809. |
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| Authors: | CHENG Congli GAO Shiqiu ZHANG Zhongdong |
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| Abstract: | A modified energy-minimization multi-scale (EMMS) model is proposed th rough establishing different corresponding expressions for calculating radial pr ofiles of gas velocity in core and annulus.The calculating results of the modifi ed model are more reasonable than the previous model compared with the experimen tal results.A new model,called energy-minimization multi-scale core-annulus (EMMS/CA) model,is developed by combination of the EMMS and CA model s.The equation of CA model can be solved via the solution of EMMS model.Two-dime nsional distributions of dynamic parameters in gas-solid circulating fluidized b ed,including voidage,fluid velocity,particle velocity,slip velocity and so o n,can be calculated with the use of the present model.Comparisons with experime ntal data from literature confirmed the validity of the model. |
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| Keywords: | circulating fluidized bed energy-minimization multi-scale slip velocity clus ter core-annulus structure |
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