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Recent content by RistEcho

  1. R

    Fan upstream or downstream of a scrubber

    When installing the fan for a scrubber for exhaust gas treatment, do people like to design it upstream or downstream of scrubber? I’ve seen it done both ways, but I would like to see hear the group’s thoughts on pros/cons.
  2. R

    Rotating Packed Bed

    Does anyone have any industrial experience with using a Rotating Packed Bed (i.e. RPB, HiGee) for gas (CO2, VOC, etc.) absorption or stripping? Was the technology reliable? What are main trouble points? Online descriptions focus on RPB's advantages, such as its smaller size compared to a...
  3. R

    Wet scrubber - what happens if you continue to re-circulate a scrubbing liquid?

    Let me try to illustrate better with an example. Suppose I have a scrubber for DMF vapor at 40C at 10000ppm. I want the outlet gas concentration to be 2500ppm or less. DMF is completely miscible so solubility limit is not an issue. DMF’s Henry’s law constant is also very low (7.47 × 10−5 at...
  4. R

    Wet scrubber - what happens if you continue to re-circulate a scrubbing liquid?

    I appreciate everyone’s input. To summarize, provided that the solubility limit has not been reached, the ratio of the molar fraction of the chemical in vapor and recycling liquid will simply equal its Henry constant. Chemical concentration in vapor needs to be low (say, <3%) for Henry's Law to...
  5. R

    Wet scrubber - what happens if you continue to re-circulate a scrubbing liquid?

    I have a general question about wet bed scrubber (packed bed scrubber). If I re-circulate a scrubbing liquid (e.g. water) to capture a pollutant (e.g. a chemical compound) from a gas stream, I understand that the concentration of that chemical will accumulate in the scrubbing liquid. At what...
  6. R

    Vapor recovery unit (VRU) design and methodology

    @georgeverghese - What have been your experience with why VRUs fail or do not meet their emission targets?
  7. R

    Vapor recovery unit (VRU) design and methodology

    I've been asked to review some VRU designs for a tank terminal containing HC (activated carbon beds with PSA followed by a scrubber), but admittedly I do not have hands-on experience with VRUs so would like to seek everyone's experience. Design is for 1000 NCMH. Couple initial questions: 1...
  8. R

    Exclusion From the Scope of ASME BPVC VIII-1 - water-based solution

    Dear all, I'm designing a finned tube exchanger (think a shell tube exchanger with extruded fins on tubes) as a condenser. Gas at approximately atmospheric pressure flows on the shell side, while an ethylene glycol-based (in water) solution runs on tube side at up to 50 psig (from pump) at low...
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