Water quality for Fogging (GT's)
Water quality for Fogging (GT's)
(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: Water quality for Fogging (GT's)
There are compact self contained demin stations you can buy, and the power to operate these is easily recovered with the increase in gas turbine output.
fogger water has to be "holy water" to avoid accumulating deposits on the compressor,or imposing a stress-corrosion cracking mechanism on the compressor blades.
There have been a couple of failures of compressors in the last 5 yrs , and you can assume you will lose your OEM warranty on the compressor if you add the fogger. But the capital payback due to the added power is very hard to pass up.
RE: Water quality for Fogging (GT's)