Start-up improvement of a supplementary-fired large combined-cycle power plant. (April 2018)

• Record Type: Journal Article
• Authors: Alobaid, Falah
• Is Part Of: Journal of process control. Volume 64(2018)
• Page Start: 71
• Page End: 88
• Publication Date: 2018-04
• Subjects: APROS Advanced Process Simulation Software -- Attempt attemperator -- BFP boiler feed pump -- CCPP combined cycle power plant -- CRH cold reheater -- DC device control -- ECO economizer -- EVA evaporator -- FG flue gas -- FW feed water -- G gain of PI -- GT gas turbine -- HRSG heat recovery steam generator -- HP high-pressure -- HPBPCV1 high-pressure bypass to cold reheater -- HPBPCV2 high-pressure bypass to condenser -- MSIPCV main steam to intermediate-pressure steam turbine control valve -- IP intermediate-pressure -- LP low-pressure -- mem memory -- min minimum -- max maximum -- MSLPCV main steam to low-pressure turbine control valve -- LPBPCV low-pressure bypass to condenser -- MSHPCV main steam to high-pressure steam turbine control valve -- PI proportional-integral controller -- RH reheater -- RHBPCV reheater bypass to condenser -- SCR selective catalytic reduction -- SH superheater -- Select selector -- ST steam turbine -- t integration time of PI; Large combined-cycle power plant -- Supplementary-fired heat recovery steam generator -- Dynamic simulation -- Load change -- Start-up procedures -- Start-up improvement; Process control -- Periodicals; Fabrication -- Contrôle -- Périodiques; Process control; Periodicals; Electronic journals; 660.281
• DOI: 10.1016/j.jprocont.2018.02.007
• Languages: English
• ISSNs: 0959-1524

Abstract

Highlights: Dynamic simulation model of 350 MWth supplementary-fired combined-cycle power is developed. All process, automation and electrical components of the real power plant are modelled. Dynamic simulations of switching off the supplementary firing, part loads and start-ups are carried out. GT start-up time reductions by 30%, 80% and 93% in hot, warm and cold start-ups is achieved. HRSG reaches faster its nominal power output by 38%, 31% and 20% in hot, warm and cold start-ups. Abstract: The start-up time of a combined-cycle power plant depends mainly on the heat recovery steam generator (HRSG) with its thick-walled tubes. This work contributes to a start-up time reduction of a large combined-cycle power plant (CCPP) with a supplementary-fired HRSG. Hence, a dynamic simulation model is developed using the advanced process simulation software (APROS). The flue gas path and the water/steam side are modelled in detail. All control structures required for the plant operation are implemented, e.g. drum, steam turbine bypass system and steam temperature control. The comparison between model predictions and design data at different load changes shows high correlation towards given data with an average relative error of 5%. Using the developed model, hot, warm and cold start-ups are simulated and finally three different reduced start-up times of gas turbine (15 min, 24 min and 38 min) are evaluated. A comparison between baseline and improved start-ups reveals time saving and fast power generation rate.