Best 50MW range Gas Turbine for existing 2x1 combined cycle plant to improve heatrate
Best 50MW range Gas Turbine for existing 2x1 combined cycle plant to improve heatrate
(OP)
We are looking to add one GT/HRSG package in our existing 150MW supplementary fired CC plant in order to stop duct firing and use the 3rd GT/HRSG to supply about 160-170 kpph (~75ton/hr) HP steam presently coming by Duct firing. Maximum Steam pressure for ST is @ 1470psi (100bar) & steam inlet temperature is 930F (500C). Since we are limited by our Electrical Power Evacuation limit, therefore only 50-55MW GT model will be compatible. Exhaust Temp. of new GT shall be > 970F and HRSG shall be Single Pressure (HP drum only) because LP steam is already on maximum limits. I am asking for the best GT model suitable for integration which provides the best efficiency at minimum cost. In my view Siemens SGT800 or GE 6F.01 are the only proper candidates. I would appreciate any detailed views from engineering community. Also what will be approximate cost of of this addition. it may be noted that ST, Condenser & Cooling Tower are not needed because overall steam requirements will not change.
Regards,
Asif, Operations Manager
Regards,
Asif, Operations Manager
RE: Best 50MW range Gas Turbine for existing 2x1 combined cycle plant to improve heatrate
RE: Best 50MW range Gas Turbine for existing 2x1 combined cycle plant to improve heatrate
RE: Best 50MW range Gas Turbine for existing 2x1 combined cycle plant to improve heatrate
Are you intending to use the HRSG to raise HP steam rather than just IP and LP steam? I'm guessing this is the reason for the relatively high minimum EGT?
RE: Best 50MW range Gas Turbine for existing 2x1 combined cycle plant to improve heatrate
RE: Best 50MW range Gas Turbine for existing 2x1 combined cycle plant to improve heatrate
RE: Best 50MW range Gas Turbine for existing 2x1 combined cycle plant to improve heatrate
RE: Best 50MW range Gas Turbine for existing 2x1 combined cycle plant to improve heatrate
- condenser
-cooling tower
-condensate pumps
-water treatment
-need to add double block and bleed valves on boilers as they will be on a "header system"
- steam turbine blade and path review, thrust calcs, etc
-transformers and electrical buses
-fuel gas flow element , press reducing station or compressor
-financial calcs- all of this investment is aimed at improving heat rate to reduce the fuel charge, but at historically low fuel gas costs it may be difficult to prove a adequate rate of return.
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