摘要
CO_(2)氢化合成低碳烯烃是一种非石油原料合成烯烃路径,具有广阔的应用前景。以有限时间热力学理论为基础,对包含混合器、压缩机、换热器与CO_(2)氢化合成低碳烯烃反应器的反应流程进行建模及优化。在压缩机效率和癸烯(C10H20)产率均给定以及换热器与反应器热源温度完全可控的条件下,以整个流程的熵产率最小为优化目标,对流程最小熵产率及换热器与反应器的热源温度分布最优构型进行数值求解,并将最优流程与反应器熵产率最小对应流程进行对比。结果表明:通过优化使反应流程熵产率相比参考反应流程下降7.77%;在优化范围内,选取较低的换热器出口温度、适当提高H2摩尔分数与降低CO_(2)摩尔分数可以降低反应流程的熵产率。研究结果对CO_(2)氢化合成低碳烯烃反应流程最优设计具有一定理论指导意义。
The CO_(2) hydrogenation to light olefins is a synthesis method of light olefins that does not use petroleum. Based on the theory of finite-time thermodynamics(FTT), the reaction process model including mixer, compressor, heat exchanger and CO_(2) hydrogenation to light olefins reactor is established and optimized.Taking the compressor efficiency and the decene(C_(10)H_(20)) yield as given parameters, and the heat reservoir temperatures of both the heat exchanger and the reactor as controllable factors, the optimization objective is to minimize the total entropy generation rate of the entire process. The minimum entropy generation rate of the process and the optimal configurations of the heat reservoir temperature distributions of both the heat exchanger and the reactor are derived numerically and compared with the corresponding process with the minimum entropy generation of the reactor. The results show that the optimized entropy generation rate of the reaction process is reduced by 7.77% compared with the reference process. Within the scope of optimization, the entropy generation rate of the reaction process can be reduced by selecting a lower heat exchanger outlet temperature, appropriately increasing the H_2 mole fraction and reducing the CO_(2) mole fraction. The obtained results could supply theoretical guidance for the optimal design of CO_(2) hydrogenation to light olefins reaction process.
作者
于亚杰
夏少军
赵明
YU Yajie;XIA Shaojun;ZHAO Ming(College of Power Engineering,Naval University of Engineering,Wuhan 430033,China)
出处
《热科学与技术》
CAS
CSCD
北大核心
2024年第3期257-266,共10页
Journal of Thermal Science and Technology
基金
国家自然科学基金资助项目(51976235,51606218)
湖北省自然科学基金资助项目(2018CFB708)。
关键词
有限时间热力学
合成低碳烯烃
化学反应流程
熵产率最小化
finite-time thermodynamics
synthesis of light olefins
chemical reaction process
minimization of entropy generation rate
