Advanced exergy analysis of distillation systems by splitting the exergy destructions into endogenous and exogenous parts
The total exergy destruction in a component is resulted from the inefficiency of the component itself(endogenous exergy destruction)and other relations(exogenous exergy destructions)in a complex energy system.Advanced exergy analysis by splitting exergy destruction into endogenous and exogenous parts not only helps us to better understand the interactions between components,but also provides valuable information for identifying the exergy-saving potentials in the system,particularly when the concept is combined with the avoidable and unavoidable exergy destruction.This work presents an advanced exergy analysis in distillation processes for identifying the potential of energy savings.Conventional analysis of a C8+separation plant suggests that the energy-saving potentials of components should be improved by the order of C2(5.59%),C1(5.20%),T2(3.92%),R1(3.57%),T1(1.58%),R2(1.47%).In contrast,the advanced analysis shows that the components are ranked as C2(37.44%),T1(81.62%),C1(92.03%),R2(94.21%),R1(95.97%),T2(86.49%).Moreover,plotting the advanced exergy analysis results of all components in asimple diagram(Carnot efficiency(energy grade ε)versus heat flow rate diagram((T-T0)/T vs.Q))clearly reveals the inherent mechanism of exergy destruction and the direction for energy-saving.This study demonstrates that scheme from the advanced analysis offers better understanding to the exergy destruction process,which is useful in the future design/heat integration of distillation system.
Distillation system Exergy analysis Endogenous / exogenous Exergy evaluation
Ting Chen Bingjian Zhang Qinglin Chen
School of Chemistry and Chemical Engineering/Key Lab of Low-carbon Chemistry & Energy Conservation of Guangdong Province,Sun Yat-Sen University,Guangzhou 510275,China
国际会议
桂林
英文
1-17
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）