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Research Papers: Gas Turbines: Cycle Innovations

Cascade Utilization of Fuel Gas Energy in Gas-to-Liquids Plant

[+] Author and Article Information
Shimin Deng

Hatch,
2800 Speakman Drive,
Mississauga, ON L5K 2R7, Canada
e-mail: bdeng@hatch.ca

Rory Hynes

Hatch,
2800 Speakman Drive,
Mississauga, ON L5K2R7, Canada

Contributed by the Cycle Innovations Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 8, 2013; final manuscript received January 23, 2014; published online February 20, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(7), 071702 (Feb 20, 2014) (5 pages) Paper No: GTP-13-1442; doi: 10.1115/1.4026599 History: Received December 08, 2013; Revised January 23, 2014

This paper investigates on a gas-to-liquids (GTL) plant with ATR syngas production and proposes a new process to use a gas turbine and waste heat recovery gas/steam streams preheater to replace the fired heater. The new process features cascade utilization of fuel gas energy, as fuel gas is firstly used in a gas turbine (GT) at very high temperature and then lower-temperature GT exhaust gas is further used for preheating. Large exergy loss of heat transfer in the fired heater is eliminated. The improved process has an equivalent power generation efficiency of 80% which is significantly higher than conventional technology. Economic analysis indicates 129.8 M$ revenue would be produced over the lifetime if the extra power from a 15,000 bbl/d GTL plant can be exported to the grid at the price of cost of electricity for a conventional natural gas fired combined cycle plant.

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Figures

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Fig. 1

Block flow diagram of GTL plant

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Fig. 2

Flow diagram of fired heater

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Fig. 3

Flow diagram of GT and WHRGSP

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Fig. 4

Original steam/condensate utilization and power generation system

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Fig. 5

Improved steam/condensate utilization and power generation system

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Fig. 6

Heat transfer profile in fired heater

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Fig. 7

Heat transfer profile in WHRGSP

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