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  1. refiner

    Heavy metal in wastewater

    Hi. I wonder if activated sludge system can handle heavy metal.especially arsenic and mercury, in wastewater or not. Concentration is 150 mg/l As, 0.1 mg/l Hg, and COD of 2500 mg/l. Or is there any pre-treatment system that can handle before sending to the activated sludge. Thank you in advance...
  2. refiner

    High flue gas temperature

    Hi op9 and Setra, 2 - 3 % excess o2 is same for FO and FG, we used to increase this to 5 - 6 % but does not help much. Unfortunately we don't have CO analyzer. You are right that we have radiant coil only but there is no baffle and no air preheater. We are trying to "seal" every...
  3. refiner

    High flue gas temperature

    Hi setra, You are right that the damper was damaged by overheating. Damper material is SS310.
  4. refiner

    High flue gas temperature

    Thanks Setra and Combuster, Here's some more info. Fuel type : Fuel oil and Fuel gas Product : heavy naphtha Design flue gas temp : 890 deg. C (but actual flue gas temp was more than 900 deg C at design feed capacity!) This furnace has been operating for years but this problem has just happened...
  5. refiner

    High flue gas temperature

    Hi, Can anybody give me recommendations? We've got a problem with a furnace - very high flue gas temperature at only 70 % heat load. This furnace has no convection tube. Its flue gas duct is connected to others furnace's duct (We have no problem with other furnaces). We have tried : -...
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