Soft Sensor for Ammonia Concentration at the Ammonia Converter Outlet Based on an Improved Group Search Optimization and BP Neural Network*

Chinese Journal of Chemical Engineering ›› 2012, Vol. 20 ›› Issue (6): 1184-1190.

Soft Sensor for Ammonia Concentration at the Ammonia Converter Outlet Based on an Improved Group Search Optimization and BP Neural Network^*

阎兴頔, 杨文, 马贺贺, 侍洪波

Key Laboratory of Advanced Control and Optimization for Chemical Processes of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

收稿日期:2012-06-08 修回日期:2012-07-20 出版日期:2012-12-28 发布日期:2012-12-28
通讯作者: SHI Hongbo,E-mail:hbshi@ecust.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (61074079);Shanghai Leading Academic Discipline Project(B504);Specialized Research Fund for the Doctoral Program of Higher Education of China (20100074120010);the Natural Science Foundation of Shanghai City (11ZR1409700)

Soft Sensor for Ammonia Concentration at the Ammonia Converter Outlet Based on an Improved Group Search Optimization and BP Neural Network^*

YAN Xingdi, YANG Wen, MA Hehe, SHI Hongbo

Key Laboratory of Advanced Control and Optimization for Chemical Processes of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

Received:2012-06-08 Revised:2012-07-20 Online:2012-12-28 Published:2012-12-28
Supported by:
Supported by the National Natural Science Foundation of China (61074079);Shanghai Leading Academic Discipline Project(B504);Specialized Research Fund for the Doctoral Program of Higher Education of China (20100074120010);the Natural Science Foundation of Shanghai City (11ZR1409700)

摘要/Abstract

摘要： The ammonia synthesis reactor is the core unit in the whole ammonia synthesis production.The ammonia concentration at the ammonia converter outlet is a significant process variable,which reflects directly the production efficiency.However,it is hard to be measured reliably online in real applications.In this paper,a soft sensor based on BP neural network (BPNN) is applied to estimate the ammonia concentration.A modified group search optimization with nearest neighborhood (GSO-NH) is proposed to optimize the weights and thresholds of BPNN.GSO-NH is integrated with BPNN to build a soft sensor model.Finally,the soft sensor model based on BPNN and GSO-NH (GSO-NH-NN) is used to infer the outlet ammonia concentration in a real-world application.Three other modeling methods are applied for comparison with GSO-NH-NN.The results show that the soft sensor based on GSO-NH-NN has a good prediction performance with high accuracy.Moreover,the GSO-NH-NN also provides good generalization ability to other modeling problems in ammonia synthesis production.

关键词: ammonia synthesis, ammonia concentration, soft sensor, group search optimization

Abstract: The ammonia synthesis reactor is the core unit in the whole ammonia synthesis production.The ammonia concentration at the ammonia converter outlet is a significant process variable,which reflects directly the production efficiency.However,it is hard to be measured reliably online in real applications.In this paper,a soft sensor based on BP neural network (BPNN) is applied to estimate the ammonia concentration.A modified group search optimization with nearest neighborhood (GSO-NH) is proposed to optimize the weights and thresholds of BPNN.GSO-NH is integrated with BPNN to build a soft sensor model.Finally,the soft sensor model based on BPNN and GSO-NH (GSO-NH-NN) is used to infer the outlet ammonia concentration in a real-world application.Three other modeling methods are applied for comparison with GSO-NH-NN.The results show that the soft sensor based on GSO-NH-NN has a good prediction performance with high accuracy.Moreover,the GSO-NH-NN also provides good generalization ability to other modeling problems in ammonia synthesis production.

Key words: ammonia synthesis, ammonia concentration, soft sensor, group search optimization

阎兴頔, 杨文, 马贺贺, 侍洪波. Soft Sensor for Ammonia Concentration at the Ammonia Converter Outlet Based on an Improved Group Search Optimization and BP Neural Network^*[J]. Chinese Journal of Chemical Engineering, 2012, 20(6): 1184-1190.

YAN Xingdi, YANG Wen, MA Hehe, SHI Hongbo. Soft Sensor for Ammonia Concentration at the Ammonia Converter Outlet Based on an Improved Group Search Optimization and BP Neural Network^*[J]. Chin.J.Chem.Eng., 2012, 20(6): 1184-1190.

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Soft Sensor for Ammonia Concentration at the Ammonia Converter Outlet Based on an Improved Group Search Optimization and BP Neural Network^*

Soft Sensor for Ammonia Concentration at the Ammonia Converter Outlet Based on an Improved Group Search Optimization and BP Neural Network^*

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