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  1. robot6

    Desuperheating in PRO/II

    Ah, yes, you can do it in excel and I have done it there a ton of times. In fact I actually coded the IAWPS equations into visual basic so that I could get away from tables.... which crash the solver in excel because of the discontinuity betwen points. The point of the posted question (as...
  2. robot6

    Desuperheating in PRO/II

    What's the best way to model a desuperheater? Difficulty arises if... 1) you try to control against "dew temperature," because you can add slightly more water and the temperature doesn't change -> solver doesn't solve 2) you send the outlet of the mixer into a phase separator and look for a...
  3. robot6

    Accuracy of ultrasonic thickness measurement.

    Thanks!!!
  4. robot6

    Accuracy of ultrasonic thickness measurement.

    Do you get a more accurate result measuring the thickness of the metal of an elbow, when the process is running or when it is shut down? I'm concerned about interference from other sources. I think it may not matter, because the frequencies of ultrasound are not within the spectrum of the...
  5. robot6

    Sulfuric acid dryer

    Thanks for the reference! Trying to convince management to purchase...
  6. robot6

    Sulfuric acid dryer

    Here's a page from the second edition. I forgot to look there. They recommend SX or SARAMET or ZeCor, without a corrosion barrier under the "Alternate materials." Now I have to figure out who will make me a vessel and what the maximum temp of the sulfuric acid should be so I can design the...
  7. robot6

    Sulfuric acid dryer

    Ironic_metallurgist! Thank you for the references! Always nice to get more reading material. But inherent in your answer is that theoretically it's possible to forego brick lining, it seems.
  8. robot6

    Sulfuric acid dryer

    A lot of sulfuric acid plant vessels are brick-lined. The vessel is typically made of carbon steel. Brick lining can crack during transport and installation, and increases the cost of the carbon steel vessel. On the other hand, 316L and other stainless steels can be found which have minimal...
  9. robot6

    Diverter or mixing valve

    Maintaining velocity is important, because it reduces the thickness of the insulating wall film. (Remember the boundary condition which indicates that vfluid -> 0 at the wall, so there is a mass of fluid on the wall that does not move and acts as an insulator. Theoretically, of course.) To...
  10. robot6

    Bustles on heat exchangers

    I often see bustles on steam heaters, and that makes sense, because you want the steam to be distributed evenly. Also, as the steam is cooled and condensed in the heater, its velocity at the inlet can become very great. I never see bustles on condensers and coolers, which use cold water to...
  11. robot6

    What's an FCE?

    Sorry, I don't know where else to post this, but it looks like "chemical engineering-other topics" would be the best place. I'm looking at a job description for a "Process Engineer -- FCE". Please let me know what FCE means. Thanks.
  12. robot6

    Mercury in a hot source

    Interesting, this seems to suggest that the mercury should be in the free state. But I think that the mercury content can exceed the H2S content in oil wells, so this may not be a surprise.
  13. robot6

    Mercury in a hot source

    I need to remove mercury from a gas which is produced from a hot source with ample hydrogen sulfide. As you may know, when you get a sample tested for mercury they report it as Hg0. But you don't really know whether it is chemically combined. And in most cases, this doesn't matter, because...
  14. robot6

    Sparging hot gas

    Folks, Thanks for the help. I will check these out. -robot6
  15. robot6

    Sparging into a slurry

    This reaction is kept going by the addition of lime to eat up the sulfuric acid... LeChatelier's...
  16. robot6

    Sparging into a slurry

    Yes, it is severely limited by O2 uptake, that is correct. The reaction is "catalyzed" by Cu(II). (I put that in quotes because I wonder whether the Cu(II) is really catalyzing the reaction, since there are some reports of it going without the Cu(II), but Cu, being a transition element, may...
  17. robot6

    Sparging hot gas

    What are your thoughts about sparging hot gas? I imagine that if you can take relatively hot gas, say 400C or so, and introduce it into water, the bubble collapse might really aid mass transfer, moving in from diffusion/film limited to really be solubility limited. Also, this would increase...
  18. robot6

    Sparging into a slurry

    What are the difficulties in sparging air into the cyanide detoxification (INCO) process, CN- + H2O + O2 + SO2 -> OCN- + H2SO4 ? Typically the "substrate" is some kind of slurry ... how does this affect sparger selection? That is, the tank is vigorously agitated, so does the sparger have...
  19. robot6

    Brake Horsepower

    LionelHutz, you understand my confusion, thanks for the help! And he is my boss, acts like a * and that's why I find it hard to approach him with questions. Thanks for participating in eng-tips! Actually all your responses are great, but here's the scoop, I finally found what I am supposed...
  20. robot6

    Brake Horsepower

    Thanks for the detailed answer, but I guess I need to make the question more direct, if I may. He wants me to report energy requirement for the proposal (which contains many motors) in units of BHP, because these are English units, and he wants the units to be consistent. However, it seems...

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