CATEGORY: STEAM SYSTEM OPTIMIZATION
PSE2015 - ESCAPE25
12th International Symposium on Process Systems Engineering and 25th
European Symposium on Computer Aided Process Engineering
Copenhagen, Denmark, 31 May - 4 June 2015
Steam
System Optimization at Mitsubishi Chemical Corporation
Kashima Site
Toshiharu Morishita
Mitsubishi Chemical Corporation Kashima Site, Maintenance Technology
Department, Process Control Technology
Group, Japan
Mitsubishi
Chemical Corporation Kashima Site is purchasing steam and power from
Kashima-Kita Electric Power Corporation, which is the main distributor of steam
and power in Kashima Industrial Area. Operators in Kashima Site was trying to
minimize steam purchasing cost by adjusting the balance of steam production and
consumption especially at the second ethylene plant. However, due to
possibility of many different operating patterns of the plant, it was difficult
for operators to find and keep the optimum steam balance all the time.
Therefore, we have prepared a complete steam system model of the overall
factory, and with this model, an optimization system which determines the
optimum operating pattern of the plant from 800 thousand possible operating
patterns has been developed.
The system has also been provided with web-based visualization tools
for monitoring of the optimized condition of the plant. Furthermore, the system
has been integrated with the advanced process control system to realize
automatic adjustment of the optimum operating condition of the plant. The
annual benefit of the application of the system in 2012 has been estimated as
50 million yen (500 thousand US dollars).
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