膜吸收法天然气脱硫的数值分析  

Numeric Alanalysis of Membrane-absorption for Natural Gas Desulfurization

作　　者：马路 李恩田 王剑[2] 王树立[2] 曹鑫[2] 刘永亮[2] 

机构地区：[1]江苏省油气储运技术重点实验室 [2]常州大学石油工程学院,常州213016

出　　处：《科学技术与工程》2013年第19期5475-5481,5486,共8页Science Technology and Engineering

基　　金：江苏省科技厅资助项目(BY2011127);(BY2012095);中石油科技创新基金项目(2012D-5006-0604)资助

摘　　要：在双膜理论的基础上,建立了传质阻力方程和传质微分方程相结合的传质动力学模型。模拟了以N-甲基二乙醇胺(MDEA)为吸收液,聚丙烯疏水性中空纤维膜接触器吸收H2S的传质过程;并进行了相应的天然气脱硫实验。模拟结果显示:H2S脱除率随吸收液浓度和气相压力的增大而增大,随气体流量的增大而降低,模拟值和实验值吻合较好;气体流速的升高导致管内同一点处H2S的浓度也随之升高,开始时H2S浓度沿轴向降低速度较快,然后趋于平缓;随着轴向长度的增加,H2S浓度沿管程逐渐减小,其径向的下降幅度逐渐减弱。该模型能够预测给定操作条件下的脱硫率,并对膜组件的设计提供了一定的理论依据。A dynamic model of mass transfer was developed, which included mass transfer equation and mass transfer differential equation. The transport of hydrogen sulfide through hollow fiber hydrophobic membrane （HFM） contactors while using N-methyldiethanolamine （MDEA） as the chemical solvent was simulated. The model results matched with the experimental data well, which indicated that the removal of H2S increased while increasing con- centration of MDEA and gas pressure, however, the removal of H2 S decreased while increasing gas velocity. H2 S concentration at the same point in the tube increased with the rate of gas flow. At the beginning, the speed of the H2S concentration along the axial direction reduced faster and then flatten out. With the increasing of the axial length, H2S concentration along the tube side decreased gradually and the radial extent declines slowly. The model could predict the desulfurization efficiency of a given operation conditions and provided a certain theoretical basis for the design of membrane modules.

关 键 词：膜基吸收 硫化氢 数值分析 

分 类 号：TE644[石油与天然气工程—油气加工工程] O643.46[理学—物理化学]