Logistic函数在连续投料厌氧消化过程分析中的应用  

Application of Logistic Function in Analysis of Continuous Feeding Anaerobic Digestion Process

作　　者：郑锐 蒋东云[2] 农以宁[2] 谢鸿全 颜家兴 ZHENG Rui;JIANG Dong-yun;NONG Yi-ning;XIE Hong-quan;YAN Jia-xing(School of Electronic Engineering and Automation,Guilin University of Electronic Technology,Guilin 541004,China;School of Life and Environmental Science,Guilin University of Electronic Technology,Guilin 541004,China;Guangxi Research Institute of Chemical Industry Co Ltd,Nanning 530001,China)

机构地区：[1]桂林电子科技大学电子工程与自动化学院,广西桂林541004 [2]桂林电子科技大学生命与环境科学学院,广西桂林541004 [3]广西化工研究院有限公司,广西南宁530001

出　　处：《中国沼气》2019年第6期19-24,共6页China Biogas

基　　金：国家科技支撑计划项目(2015BAL04B03);桂科(AB18221104);广西重点研发桂科(AB16380321);中央引导地方科技发展专项

摘　　要：文章通过在线监测连续投料的厌氧消化产气过程,对不同阶段的累积产气量、CH 4和CO 2浓度应用Logistic函数进行拟合并比较其结果。研究发现:1)连续投料厌氧消化过程的各阶段累积产气量与消化时间的关系与Logistic函数的S型曲线相吻合,拟合曲线的均方差R 2高于0.99;2)采用Logistic函数拟合产气中CH 4和CO 2的含量随时间变化的数据,拟合曲线的均方差R 2也高于0.98;3)沼气中CH 4和CO 2的浓度此消彼长动态相关,其拟合曲线的交点接近50%。应用拟合曲线进行动态模拟仿真,可实现对厌氧消化过程的智能化控制。A continuous feeding anaerobic digestion biogas production process was monitored online.The cumulative biogas production,concentrations of CH 4 and CO 2 in different stages were fitted with Logistic function,and the results were compared.The study found that:1)The relationship between cumulative gas production and digestion time in each stage of continuous feed anaerobic process was consistent with the S-curve of the Logistic function,and the mean square error R 2 of the fitted curve was higher than 0.99.2)The relationship between concentrations of CH 4 and CO 2 in biogas with digestion time was fitted by Logistic function,and the mean square error R 2 of the fitted curve was also higher than 0.98.3)The content of CH 4 and CO 2 in biogas was dynamically balanced,and the intersection of the fitting curve was close to 50%.By applying the fitting curve to the dynamic simulation,the intelligent control of anaerobic digestion process can be realized.

关 键 词：Logistic函数拟合 厌氧消化 在线监测 中试规模 沼气分析 

分 类 号：S216.4[农业科学—农业机械化工程]