NDLI: A heuristic approach to grade transition strategy of the HDPE slurry process in different operation modes

Content Provider	Springer Nature Link
Author	Liao, Zuwei Wang, Ping Wang, Jingdai Yang, Yongrong
Copyright Year	2013
Abstract	To satisfy fast changing market demands, polymer plants are forced to operate under frequent grade transition polices which produce a huge amount of off-specification product and waste the time of normal production. In the present study, a model of grade transition is presented for the industrial continuous high-density polyethylene (HDPE) slurry process, which includes two stirred reactors connected in either parallel mode or series mode. The objective of the study is to maximize the economic benefit and minimize the negative environmental impact of the process. Different objective functions are constructed according to the different operation modes. The trajectories of the operating variables can be optimized successfully with the desired polymer quality targets. A heuristic combined strategy is proposed to solve the unstable problem caused by mathematical optimization during the transition between parallel mode and series mode. The problem is solved from three aspects: temperature, operating variables, and material flow. The result indicates that the heuristic combined grade transition takes longer time, but is more feasible in the restriction of the manipulated variables and therefore more effective in controlling the instantaneous properties of the polymer produced.
Starting Page	833
Ending Page	849
Page Count	17
File Format	PDF
ISSN	1618954X
Journal	Clean Technologies and Environmental Policy
Volume Number	15
Issue Number	5
e-ISSN	16189558
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-02-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Grade transition Objective function HDPE Slurry process Parallel mode Series mode Heuristic combined strategy Sustainable Development Industrial Chemistry/Chemical Engineering Industrial and Production Engineering Environmental Engineering/Biotechnology Environmental Economics
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Environmental Engineering Economics and Econometrics Business, Management and Accounting Management, Monitoring, Policy and Law

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