| 传质对热天平坩埚内煤焦气化反应的影响 |
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| 引用本文： | 周静,何品晶,程德理,代正华,于遵宏.传质对热天平坩埚内煤焦气化反应的影响[J].化工学报,2005,56(1):35-40. |
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| 作者姓名： | 周静 何品晶 程德理 代正华 于遵宏 |
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| 作者单位： | 同济大学污染控制与资源化研究国家重点实验室，上海 200092;华东理工大学洁净煤技术研究所，上海 200237 |
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| 基金项目： | 国家重点基础研究发展规划项目 (G19990 2 2 10 3 )~~ |
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| 摘 要： | 热天平标准配置的坩埚为四周及底部密封的敞口容器，气流不能穿过物料层从坩埚底部流出，从而影响煤焦气化反应的动力学行为.研究了坩埚尺寸、物料床层厚度对杯状坩埚内煤焦-CO2气化（气固相反应）影响.采用PHOENICS软件模拟分析了杯状坩埚附近及内部流体运动、浓度分布，同时建立了杯状坩埚内煤焦-CO2反应-扩散模型，两者能很好地吻合.杯状坩埚中进行的煤焦-CO2反应模型参数φ和Da反映了气体质量传递对反应的影响.
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| 关 键 词： | 煤焦气化 扩散 模型 PHOENICS软件 |
| 文章编号： | 0438-1157(2005)01-0035-06 |
| 收稿时间： | 2003-8-28 |
| 修稿时间： | 2003-11-17
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Mass transfer phenomena during coal char gasification reaction in thermobalance setup |
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| ZHOU Jing,HE Pinjing,CHENG Deli,DAI Zhenghua,YU Zunhong.Mass transfer phenomena during coal char gasification reaction in thermobalance setup[J].Journal of Chemical Industry and Engineering(China),2005,56(1):35-40. |
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| Authors: | ZHOU Jing HE Pinjing CHENG Deli DAI Zhenghua YU Zunhong |
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| Abstract: | During the thermogravimetric measurement of reaction rates involving mass change in a solid, such as coal char gasification reactivity, the sample is contained in a cup-like crucible, and CO2 has to access through the top surface of the particle bed.CO2 mass transfer limitations control their reaction in such situations.Different types of crucibles and coal char initial mass loadings were employed to study the effect of gas mass transfer on coal char gasification rate.The reaction temperature was 1140 ℃,which was in the chemical controlled reaction regime for the coal char gasification.The conclusion indicated that the coal char gasification rate strongly dependent on the crucible type and char initial mass loading.However, the gas mass transfer around and inside a crucible could be simulated by the computational fluid dynamics PHOENICS package.By simulating the space above the bed, it was confirmed that diffusion could supply most of the CO2 to the bed surface and molecular diffusion governed the mass transfer.Also, a mono-dimensional model was developed.Two parameters were used to indicate whether mass transfer was constraining the reaction either inside or to the bed according to the model.And, the CO2 concentration calculated by PHOENICS software was in good agreement with what was predicted by the model developed in this work so that the mono-dimensional model could play an important role on studying the gas-solid reaction kinetics when a cup-like crucible was employed during the thermogravimetric measurement. |
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| Keywords: | char gasification diffusion model PHOENICS package |
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