Detecting and purging combustible gases from heat recovery steam

Details Detecting and purging combustible gases from heat recovery steam Detecting and purging combustible gases from heat recovery steam

1996-12-30

1998-10-13

Kamen, Noah P.

Power plants

Motive fluid energized by externally applied heat

Process of power production or system operation

F01K 1302

Patent

active

058195394

ABSTRACT:
A gas turbine combined cycle system with a heat recovery steam generator which may include enclosed adjacent cavities may accumulate combustible gas mixtures during shut-downs. Gas detectors located in the heat transfer section of the heat recovery steam generator, in related duct work and in the adjacent cavities detect the presence of these gas mixtures and produce appropriate signals. A signal from the detectors in the cavities initiate the aspiration of the mixture from the cavity. Signals from the detectors in the heat transfer section and ducts as well as from the cavities control the gas turbine so that upon start-up, no fuel is introduced to the gas turbine so that the gas turbine forces purge air through the heat recovery steam generator. When all of the signals indicate that no combustible gas mixtures are present, the gas turbine is ignited.

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