吸附天然气储罐放气过程的数学模拟  

Performance Simulation of Adsorption Natural Gas Storage Cylinders during Discharge

作　　者：傅国旗[1] 周理[1] 

机构地区：[1]天津大学化学工程研究所,天津300072

出　　处：《计算机与应用化学》2001年第1期35-40,共6页Computers and Applied Chemistry

基　　金：日本丰田公司助研金资助项目!(No 98112 )

摘　　要：吸附天然气储罐的放气行为与其实际应用密切相关 ,因而对此研究具有重要意义。描述该过程的数学模型是含积分约束条件的发展型偏微分方程组 ,其中的积分约束方程较难处理。针对文献中其他求解方法的不足 ,本文基于线上方法 ,采用正交配置离散空间变量 ,无需对模型本身另作特别处理 ,用Radu积分式即可以很容易地处理积分约束方程 ,并用DASSL软件求解所得隐式常微分方程组 ,解法方便、快捷、稳定。通过模拟计算分析了改善储罐放气性能的途径。指出增加床层导热系数并非改善放气性能的有效方法 ,而采用给罐壁加热的方式较易消除吸附热效应对放气过程的不利影响。The performance of adsorptive natural gas storage systems during discharge is important in view of the commercial application. However, the simulation model consists of evolutionary partial differential equations, coupled with an integral constraint equation is difficult to be solved. A new strategy is proposed in order to overcome the drawbacks involved in the previous solution methods. On the basis of numerical method of lines the spatial variables are discretized using orthogonal collocation. The integral constraint equation can be dealt with using Radu quadrature without any special reformulation of the model, and a set of resulting implicit time-derivative ODEs are solved with the software DASSL. It is shown that this method is convenient, fast and stable. Furthermore, a series of simulations are employed on enhancing the performance of the storage cylinders. The simulation results reveal that increasing heat conductivity of adsorbent bed is not a feasible approach to improve the performance, while maintaining the wall cylinder at moderate temperatures can effectively offset the performance loss.

关 键 词：吸附 天然气 存储 正交配置 储罐 放气过程 数学模拟 

分 类 号：TE82[石油与天然气工程—油气储运工程]