Research Papers: Gas Turbines: Cycle Innovations

Gas Turbine Combined Cycle Optimized for Postcombustion Carbon Capture

[+] Author and Article Information
S. Can Gülen

Bechtel Infrastructure and Power,
Reston, VA 20190

Chris Hall

Bechtel Oil, Gas and Chemicals,
London EC4V 6RN, UK

Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 20, 2017; final manuscript received January 10, 2018; published online May 24, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(9), 091701 (May 24, 2018) (9 pages) Paper No: GTP-17-1625; doi: 10.1115/1.4039733 History: Received November 20, 2017; Revised January 10, 2018

This paper describes a gas turbine combined cycle (GTCC) power plant system, which addresses the three key design challenges of postcombustion CO2 capture from the stack gas of a GTCC power plant using aqueous amine-based scrubbing method by offering the following: (i) low heat recovery steam generator (HRSG) stack gas temperature, (ii) increased HRSG stack gas CO2 content, and (iii) decreased HRSG stack gas O2 content. This is achieved by combining two bottoming cycle modifications in an inventive manner, i.e., (i) high supplementary (duct) firing in the HRSG and (ii) recirculation of the HRSG stack gas. It is shown that, compared to an existing natural gas-fired GTCC power plant with postcombustion capture, it is possible to reduce the CO2 capture penalty—power diverted away from generation—by almost 65% and the overall capital cost ($/kW) by about 35%.

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Fig. 1

Carbon dioxide capture from flue gas via aqueous amine-based absorption

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Fig. 2

Simple one-pressure HRSG with duct firing and stack gas recirculation

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Fig. 3

Stack gas temperature and CO2 content

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Fig. 4

Stack gas temperature and O2 content

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Fig. 5

Exhaust gas recirculation with booster fan (α is EGR fraction, r is EGR flow, e is GT exhaust flow)

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Fig. 6

Simple one-pressure HRSG with duct firing and gas turbine-assisted stack gas recirculation

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Fig. 7

Exhaust gas recirculation with GTG

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Fig. 8

System diagram of the GTCC optimized for carbon capture

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Fig. 9

System diagram of the GTCC optimized for carbon capture with a HRB downstream of the recirculation GTG

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Fig. 10

Carbon capture schematic

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Fig. 11

Second law efficiency as a function of flue gas CO2 concentration [11]

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Fig. 12

Net value of the proposed system, GTC4. Economic assumptions are: H = 6000 h/year, β = 16%, levelization factor, LF = 1.169.



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