METHOD FOR ENHANCED COLD STEAM TURBINE START IN SUPPLEMENTARY FIRED MULTI GAS TURBINE COMBINED CYCLE PLANT

摘要

PROBLEM TO BE SOLVED: To provide an improved method for a cold or warm steam turbine start in a supplementary fired single or multi-gas turbine combined cycle plant.SOLUTION: A method for enhanced cold (or warm) steam turbine 26 start in a supplementary fired multi-gas turbine combined cycle plant 10 is disclosed. Boiler supplementary firing functionality, which is normally used to increase a steam flow when a plant gas turbine 12 is at the maximum load, is used to augment steam production with a partly loaded, temperature matched gas turbine. Lighting supplementary firing burners 29 in a heat recovery steam generator/boiler 24 serves to add enough steam, at the proper temperature, to ensure a successful cold or warm steam turbine start when the gas turbine load and related steam production capacity from a gas turbine exhaust flow are limited by the need to match the required steam temperature and/or maintain low gas turbine exhaust emissions.SELECTED DRAWING: Figure 1