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Recent content by Easel

  1. Easel

    MACT vs RACT regulations

    MACT only comes into play if your process is covered under section 112 of the Clean Air Act. The 1990 modifications set up various industrial groups and would eventually issue MACT regulations for that industry. MACT is the emission levels from control technology of the best controlled 12% of...
  2. Easel

    Effects of dry ice causing a fatal accident? - need help

    I think most of the respondants have chased the wrong issue. The TWA for CO2 is 5000 ppm or 0.5%. As CO2 concentration increase to about 1%, there is a respratory response. When the lungs sense too much CO2 breathing becomes more rapid. (CO2 is often spiked into Oxygen cylinders to increase...
  3. Easel

    Excessisve arcing in a precipitator

    Everything JEB66 has said is valid. The key is to determine what has changed OR over what timeframe has the unit performance degraded. Precipitators are very sensitive to volume. Refinery precipitators generally collect a higly resistive dust. This demands that the unit remain as clean as...
  4. Easel

    Proper Plenum Planning Problem

    To smooth the air flow will take both a gently expanding transition, preferably about 20 degree diverging angle. Second will be a pressure drop device just before the full size duct. Items such as a dense (low open area) perforated plate, mesh-type mist eliminator or a slotted wall would help...
  5. Easel

    Down wind glc calcs of solids from flue gas and Hg

    The mercury constituents leaving the stack depend on the process chemistry. IF there is combustion and chlorine, the mercury will preferentially go to HgCl2. It can go to HgO but will often leave the stack as vaporous Hg. EPA work in the Utility Industry shows that HgCl2 is captured...
  6. Easel

    316L stack after a wet FGD for a Orimulsion fired boiler

    This is the application that led to the development of the 904 series of stainless steels. The 300 series were marginal. The added chromium and nickel have allowed 904 to survive in this applicaiton. A second concern is 160 ppm of SO3. This will covert to sulfuric acid which will NOT be...
  7. Easel

    Scrubbing exhaust Gases from ng combustion

    Please explain some about the process. From the description, you are burning natural gas and want to scrub CO, CO2 and NOx. This only leaves nitrogen and water in the stream. I suspect that you are not using natrual gas combustion to generate nitrogen.
  8. Easel

    Scrubber plume

    SO3 hydrates to H2SO4 and leaves a system as a <1 micron fume. Being so small, the opacity contribution is much greater than its mass contribution. It cannot be scrubbed with caustic. It must be captured by impaction (Brinks type filter mentioned earlier) or by electrostatic precipitation. Many...
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