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'A PROCESS OF INTEGRATED OPERATION OF A HEAT RECOVERY STEAM GENERATOR (HRSG) WITH SMOOTH CHANGE OVER FROM GAS TURBINE (GT) MODE TO FRESH AIR FIRING (FD) MODE COMBINED CYCLE AND CO-GENERATION SYSTEMS'
'A PROCESS OF INTEGRATED OPERATION OF A HEAT RECOVERY STEAM GENERATOR (HRSG) WITH SMOOTH CHANGE OVER FROM GAS TURBINE (GT) MODE TO FRESH AIR FIRING (FD) MODE COMBINED CYCLE AND CO-GENERATION SYSTEMS'
The invention relates to a process of integrated operation of a Heat recovery steam generator (HRSG) with smooth change over from gas turbine (GT) mode to fresh air firing (FD) mode in combined cycle and Co-generation systems comprising the steps of switching on the select for switch connected to the DCS when the gas turbine trip transfer action is to be initiated, the accessories of the FD fan and those of the HRSG being restored in desired positions wherein the GT is tripped; performing the trip transfer activities; checking the boiler (HRSG) interlocking before starting the FD-fan, the boiler interlocking including closing the inlet and outlet dampers of the ( HRSG); transmitting command to open the outlet damper upon the FD fan attains at least 80% of its full capacity; simultaneously transmitting signal to the HRSG to close the diverter to allow airflow towards the HRSG; commanding opening of the FD Fan inlet damper upon attaining the FD Fan outlet damper 100% of its full speed; and sending an "open and hold" signal to the full load control valve of the HRSG upto at least 40% to avoid high drop in outlet steam pressure followed by a 100% close command to the low load control valve for transfer of the full load control valve to FD mode of operation.
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