Cleaning Brazed Plate Heat Exchanger

  1. Is there a way to chemically clean this type of exchanger from graphite impurities (tiny particles) ? is possible to chemically remove coke,soot,graphite at all? we clean it with xylene but that doesn't help
    tnx
     
  2. jcsd
  3. brewnog

    brewnog 2,793
    Science Advisor
    Gold Member

    Interesting question.

    I've known organic solvents to be pretty good at cleaning brazed plate heat exchangers in combustion engine intercoolers before; recirculated fumes from the crankcase breather system can leave some pretty nasty carbon based deposits on the plates causing a reduction in efficiency.

    However, I'm surprised to hear that xylene isn't effective. Let me know if you do find anything...
     
  4. Take the simple approach and try vinegar.
     
  5. chemisttree

    chemisttree 3,723
    Science Advisor
    Homework Helper
    Gold Member

    Try a hot solution of sodium hydroxide in water if the material will hold up to it. A surfactant will help. Try dodecylbenzenesulfonate or Tide (about 1 to 2 %). Adding a little (5% by volume) of ethylene glycol monobutyl ether (DOW EB, active ingredient in Windex) and a percent of sodium metasilicate will have huge results. It will take time unless you have an ultrasonicator you can put the heat exchanger into. It will only take about 1/2 hour with heat, all of the above chemistry and the sonicator.

    Remember that EB is flammable, so ventilation is required. Good luck!
     
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