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71 Gas turbines as bottoming cycle Gas turbines are one of options for utilizing not burned fuel and waste heat from Solid Oxide fuel cells. The system normally consists of Solid Oxide fuel cell internal gas reforming stack, compressors, recuperator, a combustor and gas turbines. In figure 16 a layout of system has been shown. As depicted in the figure 17, exhaust gasses of SOFC will be added to gas turbine combustion chamber. After producing high temperature gasses, turbines will be used to produce extra amount of power. Even Recuperators which pre‐heat the entering air of compressors can be added to the system to utilize much more waste heat from SOFC. Figure 17: Gas turbine as bottoming cycle of fuel cell Source: Journal of Power Sources34 If a heat recovery system for cogeneration is added, up to 80% efficiency will be gained, otherwise, around 60% efficiency will be the result. The cost of a typical micro gas turbine in conjunction with Solid Oxide fuel cell will be around 2500$/kWe with about 50% efficiency. More efficient systems will cost more. Some modifications same as water injection to combustion chamber will help in increasing the efficiency. 35, 36 34 Chan, S.H., Ho, H.K., Tian, Y., Modeling of simple hybrid Solid Oxide fuel cell and gas turbine power plant, Journal of Power Sources 2009; 109: 111 ‐ 120. 35Wamei Lin, Waste heat recovery system for fuel cell system, Fuel Cell Technology 2009; TRRF05. 40PDF Image | Exergy
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