192 HWAHAK KONGHAK Vol. 41, No. 2, April, 2003, pp. 192-201 50 kW * † ** ** ** 121-742 1 *LG ( ) 550-805 754 **LG-Caltex ( ) Value Creation Center 305-380 104-4 (2002 12 2 , 2003 1 16 ) Flow Sheet Simulation and Control Structure Design for a 50 kW Phosphoric Acid Fuel Cell System Ji S. Lee, J. Kim*, Kwang S. Lee † , Hee J. Lee**, Jae C. Yang** and Seong H. Seo** Department of Chemical Engineering, Sogang University, 1, Shinsoo-dong, Mapo-gu, Seoul 121-742, Korea *LG Petrochemical Corp., 754, Chungheung-dong, Yosu 555-805, Korea **Value Creation Center, LG-Caltex Oil Corp., 104-4, Munji-dong, Yusung-gu, Daejeon 305-380, Korea (Received 2 December 2002; accepted 16 January 2003) , . , . HYSYS 50kW . . . . , . Abstract - Despite the keen and continuous interest in the fuel cell system as an alternative electricity generation system, the research has been confined mostly to the electrode material development and stack design. Sometimes, optimal design of the integrated system has also been reported. On the other hand, research on control system design has been scarcely pre- sented even though a fuel cell system may be subject to frequent load change during operation. In this study, a control sys- tem structure for a 50kW PAFC (Phosphoric Acid Fuel Cell) system has been presented based on steady state simulation studies using the commercial flow-sheet simulator, HYSYS. The prime difficulty encountered in the fuel cell control sys- tem design against load change is that it is not clear which process variable should be regulated in the primary control loop. In this study, through extensive simulation study, the hydrogen utilization ratio has been chosen as a regulation variable for the primary control loop. Since the hydrogen utilization ratio cannot be measured directly, an inference model is devised and proposed, too. On the basis of the concept of the primary control loop, the control structure for the whole PAFC system has been suggested. Key words: Phosphoric Acid Fuel Cell (PAFC), Control System Design, Load Change 1. ( ) [1]. (AFC), (PAFC), (MCFC), (SOFC), (PEMFC) . , † To whom correspondence should be addressed. E-mail: [email protected]
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HWAHAK KONGHAK Vol. 41, No. 2, April, 2003, pp. 192-201
50 kW
*†** ****
121-742 1
*LG ()550-805 754
**LG-Caltex () Value Creation Center 305-380 104-4
(2002 12 2 , 2003 1 16 !)
Flow Sheet Simulation and Control Structure Designfor a 50 kW Phosphoric Acid Fuel Cell System
Ji S. Lee, J. Kim*, Kwang S. Lee†, Hee J. Lee** , Jae C. Yang** and Seong H. Seo**
Department of Chemical Engineering, Sogang University, 1, Shinsoo-dong, Mapo-gu, Seoul 121-742, Korea*LG Petrochemical Corp., 754, Chungheung-dong, Yosu 555-805, Korea
**Value Creation Center, LG-Caltex Oil Corp., 104-4, Munji-dong, Yusung-gu, Daejeon 305-380, Korea(Received 2 December 2002; accepted 16 January 2003)
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Abstract - Despite the keen and continuous interest in the fuel cell system as an alternative electricity generation system,
the research has been confined mostly to the electrode material development and stack design. Sometimes, optimal design
of the integrated system has also been reported. On the other hand, research on control system design has been scarcely pre-
sented even though a fuel cell system may be subject to frequent load change during operation. In this study, a control sys-tem structure for a 50kW PAFC (Phosphoric Acid Fuel Cell) system has been presented based on steady state simulation
studies using the commercial flow-sheet simulator, HYSYS. The prime difficulty encountered in the fuel cell control sys-
tem design against load change is that it is not clear which process variable should be regulated in the primary control loop.
In this study, through extensive simulation study, the hydrogen utilization ratio has been chosen as a regulation variable for
the primary control loop. Since the hydrogen utilization ratio cannot be measured directly, an inference model is devised and
proposed, too. On the basis of the concept of the primary control loop, the control structure for the whole PAFC system has
been suggested.
Key words: Phosphoric Acid Fuel Cell (PAFC), Control System Design, Load Change
1.
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./01 234 /05 6 71 8 9: ;<=+ >
?@ AB CDE FG<H (AFC), IH (PAFC),
JK LM (MCFC), 3 NH (SOFC), OP
QH (PEMFC) R CS T%( UV W
). IH ( X & YZ [ V\ O](^, _†To whom correspondence should be addressed.E-mail: [email protected]