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Sequential supplementary firing in natural gas combined cycle with carbon capture: A technology option for Mexico for low-carbon electricity generation and CO2 Enhanced Oil Recovery

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Original languageEnglish
JournalInternational Journal of Greenhouse Gas Control
Early online date7 Jun 2016
DOIs
Publication statusE-pub ahead of print - 7 Jun 2016

Abstract

Combined cycle gas turbine power plants with sequential supplementary firing in the heat recovery steam generator could be an attractive alternative for markets with access to competitive natural gas prices, with an emphasis on capital cost reduction, and where supply of carbon dioxide for Enhanced Oil Recovery (EOR) is important. A techno-economic assessment shows that Sequential Supplementary Firing Combined Cycle power plants (SSFCC) compare favourably, in this context, with natural gas combined cycle (NGCC) power plant integrated with MEA-based CO2 capture. A case study with CO2 sales for EOR in Mexico is presented, with a tentative CO2 price up to $50/tCO2, over a range of fuel prices and capital cost estimates. A supercritical, double reheat combined cycle improves performance and take full advantage of sequential supplementary firing in the heat recovery steam generator (HRSG). Sequential combustion with additional fuel uses the oxygen available in the flue gas fully and keeps gas temperatures below 820°C, avoiding large irreversibilities and a step change in
capital costs in the HRSG. In addition, Sequential Supplementary Firing Combined Cycle power plants benefits from a positive effect on capital costs caused by an increase in the output of the combined steam cycle and a
reduction of the number of gas turbines, at a similar power output to that of a conventional NGCC. The lower volume of flue gas generated per unit of electrical output reduces by half the number of absorber train required.
Overall, the findings are robust over a range of fuel prices and capital costs when compared to a NGCC integrated with MEA-based CO2 capture.

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