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CO2 Removal from Plant Stacks
MJCronin, One question you asked in passing hasn't been addressed: why do gas-fired combined cycle plants emit less carbon dioxide? Two answers: 1. Natural gas contains a much higher percentage of hydrogen and lower percentage of carbon than the other usual fossil fuels, coal and oil...- dickwilber
- Post #11
- Forum: Constructed items general discussion
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GALVANIZED STEEL CONTACTING CONCRETE
wynn, I followed up on this with the American Galvanizers Association (www.galvanizeit.org) and received the following: "There is typically not a problem with galvanized surfaces in contact with concrete for many decades. There may be some reactions between the galvanized steel and the...- dickwilber
- Post #5
- Forum: Corrosion engineering
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GALVANIZED STEEL CONTACTING CONCRETE
WYNN, You misunderstood my comments - I was talking about galvanized steel components in contact with concrete. Designing and selling concrete structures with galvanized steel attachments used in moderately corrosive environments for over thirty years, I never came across any information...- dickwilber
- Post #4
- Forum: Corrosion engineering
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GALVANIZED STEEL CONTACTING CONCRETE
In over thirty years dealing with galvanized components attached directly to concrete structures, this is the first time I have ever heard of this approach. Can you tell me why? My instincts tell me the rusting of the ungalvanized steel against the concrete would be a greater problem than any...- dickwilber
- Post #2
- Forum: Corrosion engineering
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SO2/ SO3 dew point
I have found two web sites of interest: 1) V.Ganapathy provides a set of formulas at http://vganapathy.tripod.com/corros.html and 2) an on-line acid dew point calculator is available at http://www.jehar.com/dewpnt.htm . The results from both of these compare closely with my previous experience...- dickwilber
- Post #2
- Forum: Corrosion engineering
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Corrossion in dry stacks
After over 40 years in this field, I have to say, "no, there is no software available to estimate the corrosion rate in a stack". But, if the conditions you describe are constant, and the exterior surface is well insulated, then corrosion should not be a problem. The secret is to...- dickwilber
- Post #3
- Forum: Corrosion engineering
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Aluminum in contact with concrete
We had good results with a bituminous coating on either the concrete or the aluminum to maintain isolation and eliminate the formation of the growth salts which are so disruptive to the concrete. However, I would be concerned about reaction between the aluminum and the sulfur compounds in the...- dickwilber
- Post #3
- Forum: Corrosion engineering
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Acid Dew Point Corrosion - Suitable Materials
It appears that you are operating at temperatures well above the acid dew point, which is often, depending upon sulfur content, humidity, etc., above 300 degrees F (150 degrees C). The gunite (refractory concrete) provides an insulating barrier between the hot gases and the metal stack. It...- dickwilber
- Post #7
- Forum: Corrosion engineering
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Settlement or Shrinkage Cracks in Silo
Circular structures, such as silos, are notorious for developing vertical cracking from the inside to the outside - shrinkage cracking almost certainly. Normally this doesn't have much effect on the usability of the structure, but as you're operating under strong negative pressure, it become an...- dickwilber
- Post #10
- Forum: Structural engineering general discussion
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guyed stack design
Question: Why are you designing your own stack? There are half a dozen companies that specialize in this kind of work and can do a better job faster and cheaper. The first time designer usually creates a stack much heavier than needed, and many times that can still be inadequate. The first...- dickwilber
- Post #9
- Forum: Structural engineering general discussion
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Acid Dew Point Corrosion - Suitable Materials
Terry, you say a combination of paint and refractory - I assume the paint is an undercoating and the refractory goes over it? Can you tell me what temperature range you operated at?- dickwilber
- Post #5
- Forum: Corrosion engineering
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Acid Dew Point Corrosion - Suitable Materials
The acid corrosion of duct and flue surfaces has long plagued builders of combustion systems. The solutions can be quite complex - the information you have included is too sparse for a comprehensive reply. First, what is your fuel - what other gases are in the exhaust? Chlorides (probably)...- dickwilber
- Post #3
- Forum: Corrosion engineering
