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Murphy on About fuel additives.. gas turbine? boiler?...

By: Murphy [21] 4 Stars
Date: Tuesday, October 31, 2017
Time: 1:34:59 PM

I think you have a pretty good handle on fuel additives and how they manipulate Ash deposits. Your question seems to talk more about pretreatment, but I thought it might be helpful we talk about MgO and MgOH additives in liquid and solid fuels.

I would like to say that the end result is the same regardless of what it is being used. The object of the fuel additives you discussed are for corrosion control and suppress the high temperature corrosion reactions -formation of ash deposits and I dont mean just coal fired boilers but in combustion turbines or gas turbines.

Basically Additives such as Magnesium Oxides MgO and Magnesium Hydroxides MgOH and Magnesium Sulfate MgSO4 manipulate the combustion high temp corrosion reactions so the temperature at which these metal oxide or ash condensates form is lowered so they dont form on hot metal surfaces.

MgO and MgOH is sometimes less costly than MgSO4. So, that is a consideration.

MgO and MgOH will become corrosive at a temp of around 1750F or there about, but under that it works great. So, we see it is used on Boilers fuels. In a Combustion Turbine the temperatures are more tricky than a large furnace, but that is my opinion.

FYI - Sulfonate is an organo sulfur salt. We interchange this term by oversimplifying to say Magnesium makes the Sulfur Acid a Sulfur based Salt using Mg.

In pretreatment of Combustion Turbines, the use of Magnesium Sulfate MgSO4 is used to treat Vanadium Oxide deposits on Hot Section components, but not just VO for there likely is other trace metals that will condense out on the hot section components and corrode and severily just like on a boiler superheater and reheater.

I think it is important to understand the form that Sulfur take and it is generally in the form of FeS2 Pyite and or Na2SO4 Sodium Sulfate in the fuels. Na2SO4 is a bad player in Combustion Turbines hot zones and Boiler Superheaters and Reheaters. Na2SO4 has a melting temp around 1000F and mixed in the ash. Ugh doesnt begin to express the undesirability of Na2SO4 in fuels.

My general impression is the MgSO4 to V ratio is around 3:25 plus or minus some number, and it is not a rule for it is not right, so never follow it for we must and should consult with a professional to get it right and have your fuel pretreatment system double checked.

Maybe someone more smarter than me can readdress your question, but this explanation should help.

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Is Cp/Cv applicable to steam to calculate?
By: Kent mayhew [2161]

The reason that isobaric Cp heat capacity is greater than isometric Cv is that isobaric involves expansion. Remember our atmosphere has mass, so in order for a system to expand it must displace that mass. And this requires work. So Cp requires work plus the energy to heat the gas , while Cv only requires the energy to heat.

So for all gases and/or steam the work required to expand a given volume is the same that being the work required to displace our atmosphere by a given volume.

Hence t....   Read All
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