Modeling mercury adsorption on carbon particles in simulated flue gas  

模拟烟气中炭质颗粒的汞吸附模型(英文)

作　　者：王立刚[1] 陈昌和[2] Kruse H.Kolker 

机构地区：[1]北京科技大学热能系 [2]清华大学热能工程系 [3]Department of Chemical Engineering,University of North Dakota,Grand Forks,ND 58202,USA

出　　处：《Journal of Southeast University(English Edition)》2006年第2期256-259,共4页东南大学学报（英文版）

基　　金：TheNationalNaturalScienceFoundationofChina(No.50306010),theNationalBasicResearchProgramofChina(973Program)(No.G1999022200).

摘　　要：A model was developed to describe the adsorption characteristic of mercury in flue gas based on one residual carbon sample and one activated carbon sample. The differential equations were established with mass balance of mercury in the gas phase and in the solid phase. Then the model was solved using a Matlab program with a Runge-Kutta process. The mercury adsorption isotherms of these two adsorbents were obtained by breakthrough column experiments. The results show that at low gas phase mercury concentrations （ 〈 0. 3 mg/ m^3）, the adsorption equilibrium of residual carbon is in accord with the case of a type Ⅱ isotherm of the Freundich theory. Whereas the data of activated carbon falls into the Langmuir relationship, it is the case of a type Ⅲ isotherm. The experimental data were fitted to the Freundlich model by Matlab software. The variances of mercury concentration are smaller than 0. 81 which implies the agreement between measurements and simulation is quite agreeable considering the wide scatter of the measurements. This model is useful for forecasting mercury removal efficiency and is helpful to the mechanism analysis of mercury adsorption on carbon-based adsorbent.根据残炭和活性炭的穿透吸附试验数据,提出了残炭吸附等温线的数学模型.通过所取微元内气相汞和固相汞的总量平衡关系建立相关微分方程组,并运用Matlab软件结合Runge-Kutta过程推导出适用模型.穿透试验结果表明在与电厂烟气汞浓度相近的低汞浓度条件下(<0.3mg/m3),残炭的吸附等温线符合Freundich理论的Ⅱ型等温线,而活性炭的数据则明显具有Langmuir关系,即属于Ⅲ型等温线.运用Matlab软件将实验数据对修正模型进行拟合计算,经过统计分析,出口汞浓度数据方差不超过0.81,表明在允许的误差范围内,测试数据和模拟结果令人满意.该模型对汞吸附脱除效率预测和炭质吸附剂的汞吸附富集机理研究有重要意义.

关 键 词：MERCURY ADSORPTION residual carbon fly ash activated carbon 

分 类 号：X701[环境科学与工程—环境工程]