gas generation washing

not a clue what you said.

I have not heard this particular term. In my oil refinery days we "scrubbed" our refinery off gasses in a contacting vessel to remove other components - usually H2S and SO2 for example. The gas entered the bottom of a packed column and exited the top - meanwhile a scrubbing reagent entered the top of the vessel flowed downward and exited the bottom. The vessel is "packed" with rings and saddles that break up the the downflow of the reagent so it has as near 100% contact with the rising gas as possible. These rings and saddles are made of a ceramic type material and are hand stacked in the vessel. In our particular case we used caustic which absorbed the H2S and other sulfur compounds. This fuel gas is now considered to be "sweet" - that means virtually no sulfur compounds. Depending upon the makeup of the particular gas there may be several of these columns in series with each other. This process is also done on landfill gasses (methane). One difference here is that the gas that is scrubbed out is CO2. Landfill fuel gas is also cooled to condense out any entrained water vapor that is usually present in the raw gas. The gas is now clean enough to sell to a utility or to burn in a boiler , combustion turbine or furnace.I hope this is what you meant and are looking for. Good luck in your quest. Ed

Thanx a lot.

I'm in a fertiliser manufacturing company. We are using natural / associated gas for making ammonia, urea. Quantum of the gas from the offshore platforms frequently gets reduced. The reason given by the company is GG washing. During this period they stop one of the two running compressors, due to which total avalibility of the gas in the grid is reduced as well as gas pressure drops and we have to reduce our plant load.

I personally do not have any idea regarding how this gas generation washing is done. Basically I'm a mechanical engineer and in maintenance.

The query was just to know more about the subject. Thanx once again.

Your answer is in line with what I had in my mind. But I'm not fully satisfied. Please tell me more about the same. I'm not sure whether GG washing is done to increase throughput of the gas in the grid or to reduce sulfur content in the gas or to remove condensate?

Bye!

Gas scrubbing is done in order to remove the components that you don't want in the fuel gas. Sulfur is unwanted because of pollution issues - if it is in the form of hydrogen sulfide it is very toxic - just a few hundred ppm's can be fatal to humans. Depending upon the particular composition of your gas you could lose a considerable volume in the scrubbing process - you really don't want these components anyway. Sulfur is also very corrosive on components such as the impinged blades on combustion turbines and boiler tubes and refractories. Other gasses such as carbon dioxide do not burn and only lower the therms for a given volume of gas so you don't want them either. You will not be able to find a buyer for your gas unless it meets the right specs. A really good source of detailed info on most all petrochemical processes and safety issues is The American Petroleum Institute ( API ). They publish all kinds of texts and are pretty much the final word in the industry. You should be able to find them online. Good luck. Ed

the platform has gas compressors that use gas turbine as the power sourse. A gas turbine is a jet engine. Sometimes the the the jet engine is refereed to as a Hot Gas Genererator or a Gas Generator. Beacuse the jet engine intakes air from around the platform, the air will be loaded with water and salt spray. The salts will build up on the blades in the engine and power turbines. The jet engine needs to have the blades cleaned, so they shut the engine down and wash them.

Anilrdeo are you asking about processing fuel gas for use by removing the components that you don't want or need.

OR

Are you asking about waterwashing the compressor section of a Combustion Turbine.

Your question was very vague.

Please tell me about waterwashing of the compressor section of a Combustion Turbine.

Basically there are 2 methods of water washing. "Online" and "offline" sometimes referred to as "on crank" You MUST USE Distilled or deionized water for any water washing process in ANY combustion turbine. You also use a cleaning agent that is approved by the manufacturer of the CT. We use a solution of Simple Green a citrus based cleaner followed by plain DI water. The water and cleaner is sprayed on the compressor blades in order to remove deposits that cause a loss of efficiency and possible vibration. In "on crank" washing the CT is being turned by the starter motor at 25% or so of running speed and the solution is sprayed on the blades via an access panel. We use a common garden hose and nozzle supplied by a small pump. In "online" washing the turbine is on load and the wash nozzle and piping is part of the package. I have given you the basics - maybe you should do a Google search to find what you are looking for. http://www.google.com/search?hl=en&q=Water+washing+gas+turbine+compressor+&btnG=Google+Search

ONE CAUTION : IMHO this should not be attempted by amateurs as very expensive equipment damage and injury could result. Best of luck to you. Ed

If you are looking to clean oils and grease, I recommend using PowerGreens H2Pro Cleaner/Degreaser. It's a green cleaner that actually breaks down grease and oils into their base fatty acids and allows for a better cleaning with no residue. Place parts in aqueous solution, agitate or scrub, then rinse clean. you can also use wit h a preassure washer or the like. I am unfamiliar with your equiment, but I am very familiar with cleanin. This will get oils and grease off in a safe manner without the worry of solvents, voc's or other toxic chemicals in the mix. Check it out at www.thepowergreen.com

Water washing a gas turbine compressor is entirely different from washing anything else. You must use a cleaner specified by the OEM and mineral free water. The Ca & Mg salts ( and other minerals in the water) could be a source of major problems later. What you may think is "residue free" is not especially if you use plain old "city water". What we are talking about here is near surgical cleanliness. BTW grease and oils would be a small ( if any ) component of the fouling on these blades.