A DEVICE FOR SMOOTH CHANGE OVER FROM GAS TURBINE (GT) MODE TO FRESH AIR FORCE DRAFT (FD) MODE WITH REDUCTION OF BACK PRESSURE TO THE GAS TURBINE

摘要

Accordingly, there is provided a device for inducing draft in a heat recovery steam generator (HRSG) system, the HRSG being flowable connected to a gas turbine via a transition duct acting as a passage for exhaust gas from the gas turbine, the HRSG comprising: (1) a super heater formed of a plurality of tubes, (2) an evaporator consisting of a plurality of configured tubes; (3) an economizer adjacently located to the evaporator; and (4) a condensate pre heater/makeup water heater adjacently located to the economizer. The exhaust gases from the economizer/condensate pre heater/makeup water heater emitting via a stack through a device called induced draft fan. The device comprising an uptake duct, a set of blades along with shaft and an outlet duct disposed in between the last heat transfer section of HRSG and stack.