乙烯齐聚化工流程熵产率最小化

Minimization of Entropy Generation Rate in the Chemical Process of Olefins Oligomerization

乙烯齐聚反应合成液体燃油技术在军用和民用领域具有广阔的应用前景。基于有限时间热力学,对包含混合器、压缩机、换热器以及乙烯齐聚反应器的化工流程进行了建模与优化,计算给定癸烯产率条件下流程熵产率最小时的压缩机出口压力、换热器出口温度以及换热器与反应器的管外热源分布,并将优化结果与参考化工流程以及反应器熵产率最小的对应流程进行了对比。结果表明,换热器出口温度为608.18 K和压缩机出口压力为2.68 MPa时,流程的熵产率最小,优化后的流程熵产率相比参考化工流程下降了3.12%,相较于反应器熵产率最小对应流程熵产率降低了1.30%。研究结果对乙烯齐聚化工流程最优设计具有一定的指导意义。

The technology of olefin oligomerization to synthesize liquid fuel has broad application prospects in military and civil fields.Based on the theory of finite-time thermodynamics,the chemical process model including a mixer,a compressor,a heat exchanger and an ethylene oligomerization reactor was established and optimized.The compressor outlet pressure,the heat exchanger outlet temperature and the optimal temperature configurations of the heat reservoirs outside the heat exchanger and the reactor for the minimum entropy generation rate of the chemical process were derived under the condition of a given yield of C10H20.The optimization results were also compared with those for the reference chemical process and the process with the minimum entropy generation rate of the reactor.The results showed that the entropy generation rate for the optimal process was reduced by 3.21%compared to that for the reference chemical process and by 1.30%compared to that for the process with the minimum entropy generation of the reactor when the heat exchanger outlet temperature was 608.18 K and compressor outlet pressure was 2.68 MPa.The obtained results in this paper could be a certain theoretical guidance for the optimal design of olefin oligomerization reaction process.