Gas Turbine Power Augmentation using Fogging System
Gas Turbine Power Augmentation using Fogging System
(OP)
Does anyone know or have any experience using Fogging system for power augmentation in gas turbine (501D5) operating in symple cycle? I have some questions:
How many additional MW can you obtain using this Fogging system. One of site condition is the average humidity around 70%
How much demin water do you need to increase the power output?
What are the consequences over the internal parts of the Combustion Turbine for example axial compressor diaphragms and blades using fogging system?
What happens with the heat rate when you get more power using fogging system?
I apprecciate any comments or advices.
Alberto J. Hung C.
Caracas Venezuela
How many additional MW can you obtain using this Fogging system. One of site condition is the average humidity around 70%
How much demin water do you need to increase the power output?
What are the consequences over the internal parts of the Combustion Turbine for example axial compressor diaphragms and blades using fogging system?
What happens with the heat rate when you get more power using fogging system?
I apprecciate any comments or advices.
Alberto J. Hung C.
Caracas Venezuela
Regards
Alberto J. Hung C
Caracas Venezuela





RE: Gas Turbine Power Augmentation using Fogging System
The heat rate is improved for two reasons; first, the fogging reduces the inlet air temperature by evaporation and the turbine operates closer to ISO conditions. Second, the vapor added by the fogging adds mass flow through the turbine and the turbine is basically a mass flow device, not caring whether the working fluid is water or air.
70% humidity level is a good candidate for fogging.
I can't tell you the added power offhand (others may be able to), and it varies by the minute with the ambient condition variations (humidity and temperature and atmospheric pressure) but as a generality I can say that the payoff must be good based on the number of fogging (and inlet chilling-a different method but the same result) systems I see on combustion turbines in lots of places. I saw one just last week in Canada on the north side of one of the Great Lakes and was surprised to see that in what I considered to be a cold climate.
Try contacting the 501D5-D5A Users group to see how many of their members are already using fogging.
rmw
RE: Gas Turbine Power Augmentation using Fogging System
The appeal of inlet fogging is low initial cost, not high performance. If you are serious about maximizing power output from your GT's, consider the use of turbine inlet chilling (TIC). A TIC system can deliver much lower inlet temperatures - probably around 10C for a W501D5 - that are independent of the prevailing wet bulb temperature with no risk to your turbine.Granted that the investment is significantly higher, but so is the benefit, so if you evaluate based on $/KW (augmented) and NPV, the TIC system will come out ahead.
RE: Gas Turbine Power Augmentation using Fogging System
www.meefog.com
(I am not affiliated with Mee)
RE: Gas Turbine Power Augmentation using Fogging System
Regards
Alberto J. Hung C
Caracas Venezuela
RE: Gas Turbine Power Augmentation using Fogging System
IGV or front compressor blades. If you want to have approximate estimation of how much power can be gained, run On line water wash and check what happens to output.