线性唯象传热定律下热驱动分离过程最优性能

Optimal performance of heat-driven separation process with phenomenological heat transfer law

考虑传热和传质过程分别服从线性不可逆热力学中的线性唯象传热定律和线性传质定律,研究了热驱动分离过程的最小耗热量和最大生产率。得到了线性唯象传热定律下给定功率输出时的内可逆热机最大效率的解析解,导出了热驱动分离过程的最小耗热量和最大生产率的解析解,并将两种不同传热规律下的优化结果进行了比较,结果表明传热规律影响热驱动分离过程最优性能。本文的研究结果可用于估算热驱动分离过程的能量需求,对实际分离过程最优设计与运行具有一定指导意义。

The minimum heat consumption and maximum productivity of a heat-driven separation process,in which the heat and mass transfer obey the linear phenomenological heat transfer law and linear mass transfer law in linear irreversible thermodynamics,is investigated.An analytical solution for the maximum efficiency of an endoreversible heat engine with the linear phenomenological heat transfer law for a given power output is obtained,and those of the minimum heat consumption and the maximum productivity of the heat-driven separation process are also obtained.The results with different heat transfer laws are compared.The results show that the heat transfer behavior has significant effects on the optimal performance of the heat-driven separation process.The results may be used to estimate the energy demand in a heat-driven separation process,and provide some theoretical guidelines for the optimal design and operation of practical separation processes.