基于最优周期bang-bang控制的乙醇生产过程强化  被引量:1

Optimal Period bang-bang Control for Ethanol Fermentation Process Enhancement

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作  者:吴思辰 伍子奇 翟持 WU Sichen;WU Ziqi;ZHAI Chi(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区:[1]昆明理工大学化学工程学院,昆明650500

出  处:《华东理工大学学报(自然科学版)》2024年第4期510-516,共7页Journal of East China University of Science and Technology

基  金:云南省重大科技专项(202202AG050001);云南省基础研究计划基金(202001AU070048)。

摘  要:随着纤维素预处理和酶水解技术的突破,发酵过程已成为制约乙醇生产的主要因素。本文从乙醇发酵的简化模型出发,分析了半连续发酵过程的稳定性以及在乙醇抑制条件下系统的失稳条件。基于最优周期控制理论,探讨了周期操作开关生产的最优准则,以及恒化器模型采用周期操控实现过程强化的最优化方案。结果表明:对于具有Monod生长函数的经典恒化器系统,周期性的bang-bang控制(在本文中指控制输出补料操作的开启及关闭)可获得较稳态操作更优的基质转化率。With the breakthrough of cellulose pretreatment and enzyme hydrolysis technology,fermentation has become one of the main limiting factors for process enhancement.Current fermentation techniques are still dominated by the old-fashioned batch mode production with the lag and stationary phase demanding considerable operational time.This handicaps production efficiency and economic viability.In addition,a downtime between two batches is requested for harvesting,cleaning and sterilization,which reduces the overall productivity and increases human labor.Continuous culturing in chemostat,on the other hand,can enhance production and reduce labor(e.g.eliminating downtime intervals,and prior-fermentation steps like shake-flask culture,inoculation and subculture).However,ethanol content might be diluted,making downstream distillation and purification difficult and costly.This study endeavors to explore possible unsteady-state operation/control strategies to improve process performance.Starting from a simplified model of ethanol fermentation,stability analysis of the semi-continuous fermentation process is performed and the instability conditions of the system under ethanol inhibition is conducted.Based on the optimal periodic control(OPC)theory,the optimal criteria for switch production by periodic operations are explored,and the benefit of periodic dilution rate in the chemostat model in terms of averaged conversion rate is discussed.The results show that for the classical chemostat model with a Monod growth function,the performance of the averaged conversion rate can be improved under certain conditions,thus providing theoretical support for the study of self-cyclic fermentation.

关 键 词:含抑制项的Monod生长动力学 最优周期控制 非稳态操控 半连续发酵 过程强化 

分 类 号:TQ021.8[化学工程]

 

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