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Research Papers

Plant-Wide Control of an Integrated Molten Carbonate Fuel Cell Plant

[+] Author and Article Information
Amir Hossein Davoodi

Department of Chemical and Petroleum
Engineering,
Sharif University of Technology,
P.O. Box 11155-9465,
Tehran, Iran
e-mail: ahddavoodi@gmail.com

Mahmoud Reza Pishvaie

Department of Chemical and Petroleum
Engineering,
Sharif University of Technology,
P.O. Box 11155-9465,
Tehran, Iran
e-mail: pishvaie@sharif.edu

1Corresponding author.

Manuscript received May 29, 2016; final manuscript received October 15, 2017; published online February 21, 2018. Assoc. Editor: Jan Van herle.

J. Electrochem. En. Conv. Stor. 15(2), 021005 (Feb 21, 2018) (9 pages) Paper No: JEECS-16-1072; doi: 10.1115/1.4039043 History: Received May 29, 2016; Revised October 15, 2017

This paper presents the design and part-load operation of a molten carbonate-micro gas turbine (MCFC/MGT) hybrid system (HS), and proposes a multiloop control strategy for the HS. A mathematical model of the system is introduced. Then, the structure of process is changed and the performance of HSs at part-load operation is studied. The novelty includes utilizing some part of the main fuel instead of auxiliary fuel in the combustion stage. The results show that the new configuration has more efficiency (about 63%). In order to keep the operating system within safe limits, variables of the control system are determined. Those controlled variables are as follows: stack temperature, fuel utilization (FU), turbine inlet temperature (TIT), and output power of HS. Based on relative gain array (RGA) analysis, control structures are suggested for two HS. Investigations on results of RGA analysis indicate that the new configuration has more interactions between inputs and outputs and so has different control structure. The dynamic simulation results show that the proposed control structure is achievable for MCFC/MGT HSs.

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References

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Figures

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Fig. 1

MCFC/MGT HS configuration (system1)

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Fig. 2

MCFC/GT HS configuration (system2)

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Fig. 3

Experimental and calculated values comparison

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Fig. 4

Change of total power versus current density

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Fig. 5

Change of total efficiency versus current density

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Fig. 6

Change of total power versus fuel flow

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Fig. 7

Change of total efficiency versus fuel flow

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Fig. 8

Control structure of system1

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Fig. 9

Control structure of system2

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Fig. 10

Process variables responses of two systems

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Fig. 11

Manipulated variables responses of two systems

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Fig. 12

Process variables responses of two systems

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Fig. 13

Manipulated variables responses of two systems

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