Abstract: An exergy balance equation which relates to heat and mass transfer on distillation stages was derived from the theory of non - equilibrium thermodynamics. This equation was used to analyze an ethylene distillation tower, and the result checked satisfactorily with that of the equilibrium thermodynamic exergy analysis. In a multiphase discontinuous system, each phase may be considered as a subsystem and all subsystems are separated by interfaces. With appropriate hypotheses, the equation of exergy loss relating to energy and mass transfer through interfaces may be expressed as follows: Thus, profound insight into distillation process could be gained to provide ideas for further improvement of the distillation scheme.

摘要： 本文应用非平衡热力学的理论建立了旨在反映精馏塔板热量传递和质量传递的有效能衡算方程,并以此方程分析了某乙烯装置的乙烯精馏塔.对于具有多相的非连续体系,可以把每一个相作为一个子体系,各个子体系由相界面隔开,在一些合理的假设条件下,可得出与相际间热量和质量传递相关联的有效能损失方程如下:D=T_0[J_q△(1/T)-sum from k to n J_k·△(μ_k/T)]从而可以深入认识精馏过程中能量转化、传递的实质,并有针对性地改进过程.计算结果表明,所建方程和经典热力学有效能衡算有着很好的一致性,可用于精馏过程的热力学分析.