超重力反应器内MEA-乙醇溶液用于沼气脱碳的优化传质模型  

Optimized Mass Transfer Model of CO_(2) Removal From Biogas by MEA-ethanol Solution in High Gravity Reactor

作　　者：尹龙天 李秀金[1] 张良[1] 常燕青 YIN Long-tian;LI Xiu-jin;ZHANG Liang;CHANG Yan-qing(College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;WELLE Environmental Group Co Ltd,Changzhou 213125,China)

机构地区：[1]北京化工大学化学工程学院,北京100029 [2]维尔利环保科技集团股份有限公司,江苏常州213125

出　　处：《中国沼气》2022年第2期39-46,共8页China Biogas

基　　金：“十三五”国家重点研发计划项目(2018YFC1900903)。

摘　　要：对超重力反应器内MEA-乙醇溶液吸收沼气中高浓度CO_(2)的传质过程进行模型化研究。该传质过程属于伴随化学反应的高浓度气体吸收过程,在传质过程中气液流量、气液相温度会有较大的变化。在实验部分进行了MEA-乙醇溶液的CO_(2)吸收能力测试实验,为模型的建立提供了基础数据;进行了超重力反应器内4.92 mol·L^(-1)的MEA-乙醇溶液用于沼气(成分为50%CH_(4)、 50%CO_(2))脱碳的传质实验,为检测模型可靠性提供依据。在模型部分使用双膜理论建立了超重力反应器内的传质过程和传热过程的数学模型,通过传质机理分析确定了数学模型中的模型参数,引入双曲正切函数优化了有效传质表面积的关联式。利用优化的数学模型预测传质结果,使用传质实验的实验值对预测值进行验证,发现实验值与预测值之间的误差在±15%以内。The mass transfer model of MEA-ethanol removing CO_(2)from biogas in a high gravity reactor(RPB) was studied.This process was a high concentration gas absorption process with chemical reaction.During this process,the gas-liquid flow rate and the gas-liquid temperature would vary greatly.The CO_(2)absorption capacity of MEA-ethanol was tested to provide data for model establishment.The 4.92 mol·L^(-1)MEA-ethanol was used to remove CO_(2)from biogas(50%CH_(4),50%CO_(2)) in the RPB,providing a basis for testing the model.The mathematical model of mass transfer and heat transfer in the RPB were established by using the double-film theory.The model parameters were determined by analyzing the mass transfer mechanism,and the correlation formula of effective mass transfer surface area was optimized by using the hyperbolic tangent function.The optimized mathematical model was used to predict the mass transfer results,and the predicted values were verified by the experimental values.It was found that the errors between the experimental values and the predicted values were within ±15%.

关 键 词：超重力反应器 MEA-乙醇溶液 沼气脱碳 数学模型 

分 类 号：S216.4[农业科学—农业机械化工程] X703[农业科学—农业工程]