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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第9卷    第1期    总第45期    2012年2月

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文章编号:1672-7029(2012)01-0036-06
尾矿库污染物传输过程的数值仿真研究及其经验
孙胜,陈松,吴超

(中南大学资源与安全工程学院,湖南长沙410083)

摘 要: 尾矿库中伴有各种复杂的理、化、生等效应下的污染物传递过程。分析了尾矿中污染物的传输机理和涉及的层流有限速率模型、涡耗散模型、涡耗散概念模型3 种化学反应模型各自的特点。结合工程实际,应用FLUENT 软件对比分析了三种模型下的尾矿污染过程,模拟结果显示: Laminar Finite-Rate 模型的残差曲线迭代到160 步开始收敛,Eddy-Dissipation 模型的残差曲线迭代到300 步后仍未稳定,EDC 模型的残差曲线变化较平稳迭代到120 步就趋于收敛。结果表明: 涡耗散模型下污染物浓度变化规律更明显; 计算效率上,涡耗散概念模型比层流有限速率模型模型低; 层流有限速率模型和涡耗散概念模型比涡耗散模型的计算更加准确。

 

关键字: 化学反应模型; 尾矿污染; FLUENT; 数值模拟; 残差曲线; 污染物浓度

Research on the numerical simulation of the pollutant transferring of tailings and experiences
SUN Sheng,CHEN Song,WU Chao

School of Resources and Safety Engineering,Central South University,Changsha 410083,China

Abstract:There is a variety of complex transfer process of pollutants in tailings,for example,physical reactions,chemical reactions and biological reactions,etc.Based on the analysis of transmission mechanism of pollutants in tailings,three relevant models of chemical reactions were introduced,including Laminar Finite-Rate model,Eddy-Dissipation model and EDC model.Combined with engineering practice,the three models under the tailings pollution process were analyzed with FLUENT software.Simulation results show that residual curve begin to converge till 160 iteration steps under Laminar Finite-Rate model,whilst more than 300 steps under Eddy-Dissipation model,and about 120 steps under EDC model.Finally,it can conclude that changes of the concentration of pollutants under Eddy-Dissipation model is the most obvious; computational efficiency of Eddy-Dissipation model is lower than Laminar Finite-Rate model; the results of Laminar Finite-Rate model and Eddy-Dissipation model are more accurate than EDC model.

 

Key words: chemical reaction models; tailings pollution; FLUENT software; numerical simulation; plot of the residuals; concentration of pollutants

ISSN 1672-7029
CN 43-1423/U

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