Demonstrating load-change transient performance of a commercial-scale natural gas combined 1 cycle power plant with post-combustion CO 2 capture 2 Corresponding

17 The present work aims to study the transient performance of a commercial-scale natural gas combined 18 cycle (NGCC) power plant with post-combustion CO2 capture (PCC) system via linked dynamic process 19 simulation models. The simulations represent real-like operation of the integrated plant during load 20 change transient events with closed-loop controllers. The focus of the study was the dynamic interaction 21 between the power plant and the PCC unit, and the performance evaluation of decentralized control 22 structures. A 613 MW three-pressure reheat NGCC with PCC using aqueous MEA was designed, 23 including PCC process scale-up. Detailed dynamic process models of the power plant and the post24 combustion unit were developed, and their validity was deemed sufficient for the purpose of application. 25 Dynamic simulations of three gas turbine load-change ramp rates (2%/min, 5%/min and 10%/min) 26 showed that the total stabilization times of the power plant’s main process variables are shorter (10-30 27 min) than for the PCC unit (1-4 hours). A dynamic interaction between the NGCC and the PCC unit is 28 found in the steam extraction to feed the reboiler duty of the PCC unit. The transient performance of 29 five decentralized PCC plant control structures under load change was analyzed. When controlling the 30 CO2 capture rate, the power plant performs in a more efficient manner at steady-state part load; however, 31 the PCC unit experiences longer stabilization times of the main process variables during load changes, 32 compared with control structures without CO2 capture rate being controlled. Control of L/G ratio of the 33 absorber columns leads to similar part load steady-state performance and significantly faster 34 stabilization times of the power plant and PCC unit’s main process variables. It is concluded that adding 35 the PCC unit to the NGCC does not significantly affect the practical load-following capability of the 36 integrated plant in a day-ahead power market, but selection of a suitable control structure is required for 37 efficient operation of the process under steady-state and transient conditions. 38

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