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  1. boilerguy

    TOC reduction in effluents

    This sounds like a typical first project for new engineers. TOC does indeed refer to the concentration of organics in water. Both aerobic and anerobic digestion (or a combination of the two) are commonly used to reduce TOC. To reduce th flow rate, you will have to identify the individual...
  2. boilerguy

    flash steam

    How about using the flue gas (smoke) to directy heat the fuel oil?
  3. boilerguy

    flash steam

    If all you are doing is heating the furnace fuel oil, then it seems like it would be more efficient to exchange the heat directly with the flue gas. You could run the fuel oil through a few coils in the furnace duct to obtain the desired temperature.
  4. boilerguy

    Tube cleaning on superheater

    I can't imagine that steam purging would be more expensive than a chemical cleaning, but I don't know the economics of your process. When we have performed tube replacements, we like to do a series of steam blows, i. e. bring the boiler up to pressure (but isolated from the generator and/or...
  5. boilerguy

    Control a pumping system off pressure or flow?

    You could stage the pumps and bypass in the following manner using a end-user pressure reading tied into your PLC: High-high pressure -- only one pump running, open FCV bypass High pressure -- one pump running, close bypass Low pressure -- two pumps running Of course, you would have to design...
  6. boilerguy

    Shipping Corrosion Inhibitor

    Are you planning on using the corrosion inhibitor for equipment lay-up, or for corrosion inhibiting during normal continuous operation?
  7. boilerguy

    Shipping Corrosion Inhibitor

    What would you consider reasonably priced? Which inhibitors have you looked at that you would consider over-priced?
  8. boilerguy

    Two Phase Choked Flow

    I can sympathize with your frustration. However, you can use some rules of thumb to help. Boiler blowdown flows generally range from 0.5% to 3% of designed feedwater flow. Pick a number within that range to estimate the blowdown rate, and then it's a simple flash calculation for each stream...
  9. boilerguy

    Two Phase Choked Flow

    Ah, this is more information than in your post in the other forum. Unless you have a very small pipe or a convoluted piping path, most of the pressure drop should occur at the nozzles, which should be located at the blowdown vessel. Therefore, you shouldn't have problems with two-phase flow in...
  10. boilerguy

    Heat Capacity Question

    In the boilers I work with, the blowdown flow measurment element is upstream of the blowdown control valve. This arrangement ensures that the flow meter only sees one-phase (liquid) flow. "The blowdown flow rate is going to depend on the choked flow rate from the boiler to an atmospheric...
  11. boilerguy

    Heat Capacity Question

    If you just want the flow rate, can you take another approach and solve the blowdown flow rate from a material balance around the boiler? i. e. Blowdown Flow = Feedwater Flow - Steam Rate This type of calculation will get you in the ballpark and will be pretty accurate for hourly or daily...
  12. boilerguy

    Furnace specs

    I'll agree with owg in that there is nothing sprecial about the cyclohexane or H2 that would prevent using them as a fuel source in a boiler or furnace. What are the physical properties of your waste stream (temperature, pressure)? If there is sufficient pressure, then you could use atomizing...

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