Research Papers

Control Performance Study on the Molten Carbonate Fuel Cell Hybrid Systems

[+] Author and Article Information
Huisheng Zhang, Shilie Weng, Ming Su, Wenshu Zhang

Key Laboratory of Power Machinery and Engineering of Education Ministry, Shanghai Jiao Tong University, Shanghai 200040, P.R. China

J. Fuel Cell Sci. Technol 7(6), 061006 (Aug 17, 2010) (8 pages) doi:10.1115/1.4001322 History: Received November 03, 2008; Revised November 14, 2009; Published August 17, 2010; Online August 17, 2010

The intention of this work is to investigate the control characteristics of molten carbonate fuel cell hybrid systems through dynamic simulation. Because of the complexity and interaction between different components in the hybrid systems, several parameters, such as the turbine rotational speed, the temperatures within the fuel cell, the differential pressure between the anodic and the cathodic side, and the steam-to-carbon ratio, need to be monitored and kept within safe limits. On the other hand, the system response to load variations is required to be as quick as possible in order to meet the energy demand. Several control loops were introduced into the hybrid system. This paper focuses on the control performance to regulate the net electrical power from the hybrid system, avoiding malfunctions or damage. The results for several operating conditions are presented and discussed.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 3

System schematic configuration of the DIR-MCFC/GT hybrid system with controller

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Figure 4

Response of FC power output

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Figure 5

Fuel flow rate response

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Figure 6

Operating voltage of the fuel cell stack

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Figure 7

Current density of the fuel cell

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Figure 8

Electrolyte temperature of the fuel cell

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Figure 9

Response of temperature in the after-burner

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Figure 10

Turbine inlet temperature response

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Figure 11

Response of the air flow rate

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Figure 12

Response for gas turbine power output

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Figure 13

Assistant fuel flow rate with TIT control

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Figure 14

TIT temperature comparisons

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Figure 15

Comparison of the hybrid system efficiency

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Figure 2

Schematic principle of a coflow DIR-MCFC cell

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Figure 1

DIR-MCFC/GT hybrid system bottoming cycle schematic configuration



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