Demonstrating load-change transient performance of a commercial-scale natural gas combined cycle power plant with post-combustion CO2 capture

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Mocholí Montañés, Rubén,1990Norges teknisk-naturvitenskapelige universitet (NTNU),Norwegian University of Science and Technology (NTNU) (author)

Demonstrating load-change transient performance of a commercial-scale natural gas combined cycle power plant with post-combustion CO2 capture

Article/chapterEnglish2017

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Elsevier BV,2017

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LIBRIS-ID:oai:research.chalmers.se:7810d8b8-a788-44ce-aeb0-c9a0d9bd44d5
https://research.chalmers.se/publication/506069URI
https://doi.org/10.1016/j.ijggc.2017.05.011DOI
https://research.chalmers.se/publication/252294URI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype

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The present work aims to study the transient performance of a commercial-scale natural gas combined cycle (NGCC) power plant with post-combustion CO2 capture (PCC) system via linked dynamic process simulation models. The simulations represent real-like operation of the integrated plant during load change transient events with closed-loop controllers. The focus of the study was the dynamic interaction between the power plant and the PCC unit, and the performance evaluation of decentralized control structures. A 613 MW three-pressure reheat NGCC with PCC using aqueous MEA was designed, including PCC process scale-up. Detailed dynamic process models of the power plant and the post-combustion unit were developed, and their validity was deemed sufficient for the purpose of application. Dynamic simulations of three gas turbine load-change ramp rates (2%/min, 5%/min and 10%/min) showed that the total stabilization times of the power plant's main process variables are shorter (10–30 min) than for the PCC unit (1–4 h). A dynamic interaction between the NGCC and the PCC unit is found in the steam extraction to feed the reboiler duty of the PCC unit. The transient performance of five decentralized PCC plant control structures under load change was analyzed. When controlling the CO2 capture rate, the power plant performs in a more efficient manner at steady-state part load; however, the PCC unit experiences longer stabilization times of the main process variables during load changes, compared with control structures without CO2 capture rate being controlled. Control of L/G ratio of the absorber columns leads to similar part load steady-state performance and significantly faster stabilization times of the power plant and PCC unit's main process variables. It is concluded that adding the PCC unit to the NGCC does not significantly affect the practical load-following capability of the integrated plant in a day-ahead power market, but selection of a suitable control structure is required for efficient operation of the process under steady-state and transient conditions.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Maskinteknik Energiteknik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Energy Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Kemiteknik Kemiska processer hsv//swe
ENGINEERING AND TECHNOLOGY Chemical Engineering Chemical Process Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Annan elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
Control
Post-combustion
Operational flexibility
Dynamic simulation
Natural gas

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Òsk Gardarsdòttir, Stefanìa,1987Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)skst (author)
Normann, Fredrik,1982Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)normann (author)
Johnsson, Filip,1960Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)fijo (author)
Nord, Lars O.Norges teknisk-naturvitenskapelige universitet (NTNU),Norwegian University of Science and Technology (NTNU) (author)
Norges teknisk-naturvitenskapelige universitet (NTNU)Chalmers tekniska högskola (creator_code:org_t)

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In:International Journal of Greenhouse Gas Control: Elsevier BV63, s. 158-1741750-5836

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