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DME gas through the regultor problem

  1. Aug 12, 2014 #1
    I am currently setting up a combustion experiment and I encountered a problem with a fuel I am using.

    For this set up, I am using DME and thread type is POL.

    After DME is evaporated in the bottle and pass through the regulator, it gets really cold that it almost freezes over in few minutes. (This is because of latent heat of vaporization within the bottle, and for regulator - isentropic expansion of the gas, cools and joule thomson cooling effect)

    Thus, this needs to be fixed.

    For this issue, the one proposed method is putting heaters near the regulator so it does not freeze

    Other method is placing a flexible line between DME bottle and regulator. Flexible line from the bottle to the regulator (In line heaters)

    Heat up these line with the heater is or put the flexible line in the hot bucket of water is suggested.

    Since the bottle connection doe not involve the electricity, this option is came out to be most relevant method. But problem is water needs to be replaced several times during the experiments.

    So I wonder whether there is other solution or suggestion for this issue.

  2. jcsd
  3. Aug 13, 2014 #2


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    Science Advisor
    Gold Member

    I will assume that DME is similar to propane in properties of evaporation and liquification. Do a search on propane systems and you will probably find a solution. First hint would be to take liquid out of the tank instead of vapor. That solves the tank freeze over problem. Hot air balloons as well as other equipment that uses propane run the pipe carrying the liquid right through the flame to vaporize it. Vehicles that run on propane have a heat exchanger using the engine coolant to accomplish the same thing.
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