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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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References

Ferguson, S., 2011, “Utility System Optimization for LNG & GTL,” Foster Wheeler, Baar, Switzerland, Technical Paper, http://www.fwc.com/getmedia/fd58ae21-c6c7-40c0-b464-bbefba600505/Utility-System-Optimisation-FINAL.pdf.aspx?ext=.pdf
Halstead, K., 2008, “Oryx GTL From Conception to Reality,” Nitrogen + Syngas, 292, pp. 43–50.
Alderton, P., 2007, “Integrated GTL and Gas Plants, Opportunities and Challenges,” SMi Gas-to-Liquids 2007 Conference, London, October 30–31.
Phillipson, M., 2012, “Unconventional Gas Monetisation: GTL—An Attractive Option?,” Foster Wheeler, Baar, Switzerland, Technical Paper, http://www.fwc.com/getmedia/3eb6f546-c7f6-426a-a227-bcd5739c4829/Unconventional-gas-monetisation-via-GTL.pdf.aspx?ext=.pdf
Economides, M. J., 2005, “The Economics of Gas to Liquids Compared to Liquefied Natural Gas,” World Energy, 8(1), pp. 136–140.
Bilgen, S., and Kaygusuz, K., 2008, “The Calculation of the Chemical Exergies of Coal-Based Fuels by Using the Higher Heating Values,” Appl. Energy, 85(8), pp. 776–785. [CrossRef]
Deng, S., and Hynes, R., 2009, “SNG Production Process Based on Hybrid Gasification,” ASME Power 2009 Conference, Albuquerque, NM, July 21–23, ASME Paper No. POWER2009-81020. [CrossRef]
Energy Information Agency, 2012, “Annual Energy Outlook 2012 Early Release,” U.S. Department of Energy, Washington, DC.
Farmer, R., ed., 2009, Gas Turbine World—2009 Performance Specs, Pequot Publishing, Inc., Fairfield, CT.

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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