Quality of water for Fogging GT inlet air
Quality of water for Fogging GT inlet air
(OP)
Hi
I have a problem with power not being available at the GT's during hot summer days. Fogging has been suggested to improve the situation.
The required water quality is the (traditional !) DMW with < 10 ppm of TDS, <3 SiO2, pH bet 6.5 to 7.5, conductance < 11x10^(-6) mho/cm.
I have the following water available...
TDS 38 ppms, sulphide 26ppm, hardness (Ca) Nil, pH 3 to 4.5,CO2 100ppm - rarely some traces of light hydrocarbons (evaporatable...) conductnce at about 50 or so...
Normally used fuel gas contains much higher H2S - about 1000 ppms, about 4% CO2.
My query is - (leaving traditional DMW quality specifications aside, which are written around ground water treatment) - can we look at the contaminants in the water (instead of the conventional markers of contamination like TDS / conductance) and evaluate their effect for use in fogging ?
TDS in this supply is due to H2S dissolved...and low pH a result of CO2 / H2S again... There is no conventional scalants (Ca/Mg...). What exactly is the effect on the (initial stages of) air compressor / GT if this quality of water is used for fogging ?
I would prefer not to treat (except for filtration) this water...as some of the treatment options (like de-aeration) is likely to create some additional problems (of disposal of H2S laden air...)
Comments are welcome....
Thanks
I have a problem with power not being available at the GT's during hot summer days. Fogging has been suggested to improve the situation.
The required water quality is the (traditional !) DMW with < 10 ppm of TDS, <3 SiO2, pH bet 6.5 to 7.5, conductance < 11x10^(-6) mho/cm.
I have the following water available...
TDS 38 ppms, sulphide 26ppm, hardness (Ca) Nil, pH 3 to 4.5,CO2 100ppm - rarely some traces of light hydrocarbons (evaporatable...) conductnce at about 50 or so...
Normally used fuel gas contains much higher H2S - about 1000 ppms, about 4% CO2.
My query is - (leaving traditional DMW quality specifications aside, which are written around ground water treatment) - can we look at the contaminants in the water (instead of the conventional markers of contamination like TDS / conductance) and evaluate their effect for use in fogging ?
TDS in this supply is due to H2S dissolved...and low pH a result of CO2 / H2S again... There is no conventional scalants (Ca/Mg...). What exactly is the effect on the (initial stages of) air compressor / GT if this quality of water is used for fogging ?
I would prefer not to treat (except for filtration) this water...as some of the treatment options (like de-aeration) is likely to create some additional problems (of disposal of H2S laden air...)
Comments are welcome....
Thanks





RE: Quality of water for Fogging GT inlet air
The end result would be that the remaining dissolved sulfide would end up coating the GT blades.
RE: Quality of water for Fogging GT inlet air
That said; fogging a small amount of water into a high volume air steam would appear to be analogous to an evaporative stripper process. The H2S and CO2 have to enter the compressor in the gas phase. Any entrained water droplets would eventually evaporate as the air is compressed and the temperature increases.
You might want to run the calculation to have on-hand should your local air regulators question the increased emission of SO2/SO3.