变压吸附分离CH_(4)/CO_(2)模拟计算与工艺设计  

Simulation Calculation and Process Design of CH_(4)/CO_(2) Separation by Pressure Swing Adsorption

作　　者：田玲 TIAN Ling(State Key Laboratory of Bio-Based Fiber Manufacturing Technology,China Textile Academy,Beijing 100025,China)

机构地区：[1]中国纺织科学研究院有限公司,生物源纤维制造技术国家重点实验室,北京100025

出　　处：《中国沼气》2023年第1期66-72,共7页China Biogas

摘　　要：利用Aspen adsim模拟软件,以CH_(4)/CO_(2)混合气体为研究对象,采用硅胶作为吸附剂,对变压吸附过程进行模拟计算。建立单塔动态吸附模型,流动模型为考虑轴向扩散的一维活塞流模型;吸附方程为扩展的Langmuir方程;传质模型选用线形推动力(Linear Drive Force,简称LDF)模型;采用塔底进料方式;床层动量平衡采用Ergun方程计算。利用该模型分别考察了不同流量、压力和温度下的床层穿透曲线。掌握了各种参数对变压吸附过程的影响,获得工艺设计和操作运行的优化解(操作温度298.15 K、压力0.6 MPa、吸附时间550 S以内)。在高压低温的优化条件下,建立双塔循环吸附过程模型,实现了系统的稳定操作。通过模拟计算,推进生物天然气提纯技术进步,为工程设计提供可靠的依据。The pressure swing adsorption process is simulated by Aspen adsim simulation software. The research object is CH_(4)/CO_(2)mixed gas, and silica gel is used as adsorbent. In the established single tower dynamic adsorption model, flow model is a one-dimensional piston flow model considering axial diffusion, and the adsorption equation is an extended Langmuir equation, as well as the linear drive force(LDF) model is selected as the mass transfer model. Mixed gas enters from the bottom of tower;the bed momentum balance is calculated by Ergun equation. The model is used to investigate the bed penetration curves under different flow, pressure and temperature. The influence of various parameters on PSA process is mastered, and the optimal solution of process design and operation is obtained, i.e. operating temperature is 298.15 K, pressure is 0.6 MPa and adsorption time within 550 s. Under the optimized conditions of high pressure and low temperature, the model of double tower circulating adsorption process is established to realize the stable operation of the system. Simulation calculation can promote the progress of biogas purification technology, and provide rationales for the engineering design.

关 键 词：变压吸附 CH_(4)/CO_(2) Aspen adsim 模拟计算 工艺设计 

分 类 号：S216.4[农业科学—农业机械化工程] TE992[农业科学—农业工程]