The cogen plant is running a small GT, which has rated output of 6560kW at site condition. At full load, the expected EGT is 543 deg C, with 24.7kg/s exhaust gas flow, and 13.62% O2 in exhaust gas. This is the design point of HRSG (simple recovery), to produce 16.5 ton/hr saturated steam.
However, during commissioning, actual EGT temperature is 524 deg C. Exhaust gas flow is not measured. O2 is at 15%. Based on HRSG vendor, their boiler cannot generate 16.5 ton/hr due to low EGT.
Based on GT OEM, they are planning to adjust IGV setting in order to increase the EGT. My question is, can the IGV setting increase EGT by 19 deg C? If it does, will air mass flow be decreased as well? Ultimately, can HRSG produce additional 1.7 ton/hr steam?
Thanks.
However, during commissioning, actual EGT temperature is 524 deg C. Exhaust gas flow is not measured. O2 is at 15%. Based on HRSG vendor, their boiler cannot generate 16.5 ton/hr due to low EGT.
Based on GT OEM, they are planning to adjust IGV setting in order to increase the EGT. My question is, can the IGV setting increase EGT by 19 deg C? If it does, will air mass flow be decreased as well? Ultimately, can HRSG produce additional 1.7 ton/hr steam?
Thanks.