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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Performance Analysis of an Intermediate-Temperature-SOFC/Gas Turbine Hybrid System Using Gasified Biomass Fuel in Different Operating Modes

[+] Author and Article Information
Xiaojing Lv

Key Laboratory for Power Machinery
and Engineering of Ministry of Education,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Hopkinson Lab,
Department of Engineering,
University of Cambridge,
Cambridge CB2 1PZ, UK

Xiaoyi Ding

Key Laboratory for Power Machinery
and Engineering of Ministry of Education,
Shanghai Jiao Tong University,
Shanghai 200240, China

Yiwu Weng

Key Laboratory for Power Machinery
and Engineering of Ministry of Education,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: ywweng@sjtu.edu.cn

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received May 7, 2018; final manuscript received June 7, 2018; published online September 14, 2018. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 141(1), 011501 (Sep 14, 2018) (5 pages) Paper No: GTP-18-1198; doi: 10.1115/1.4040811 History: Received May 07, 2018; Revised June 07, 2018

This work used the established mathematic models of an intermediate-temperature solid oxide fuel cell (IT-SOFC) and gas turbine (GT) hybrid system fueled with wood chip gas to investigate the load performance and safe characteristic under off-design conditions. Three different operating modes (mode A: regulating the fuel proportionally, and the air is passively regulated. Mode B: regulating the fuel only. Mode C: simultaneously regulating the fuel and air) were chosen, and the component safety factors (such as fuel cell maximum temperature, compressor surge margin, carbon deposition in reformer) were considered. Results show that when the operation modes A and C are executed, the hybrid system output power can be safely changed from 41% to 104%, and 45% to 103%, respectively. When mode B is executed, the load adjustment range of hybrid system is from 20% to 134%, which is wider than that of two above operation modes. However, the safety characteristic in this case is very complicated. The system will suffer from two potential malfunctions caused by too lower temperature entering turbine and CH4/CO cracking in reforming reactor when it operates in low load conditions. When the system operates in the high load conditions exceeding 130% of relative power, the potential thermal cracking of fuel cell will be occurred.

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Figures

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Fig. 4

Variation of compressor surge margin with different modes

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Fig. 5

Fuel cell working temperature and voltage with different modes

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Fig. 6

Fuel cell mean temperature gradient with different modes

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Fig. 7

SOFC output power and efficiency with different modes

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Fig. 3

Variation of fuel and air flow rates with different modes

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Fig. 2

Gas turbine operating trajectory

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Fig. 1

Flowchart of IT-SOFC/GT hybrid system

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Fig. 8

K1 and K2 of reforming with different modes

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Fig. 9

S/Cbv with different modes

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Fig. 10

Turbine inlet temperature and gas turbine output power with different modes

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Fig. 11

Hybrid system efficiency and PGT/PSOFC with different modes

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