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Written by Administrator
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Sunday, 07 September 2008 |
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Washing is the most time consuming part of the biodiesel process. The wash can be sped with a PLC and some other equipment. A PLC is a Prommable Logic Controller, this controller can be programmed to control a wash cycle so that it can be touch free for the user. For this system the PLC is wired to two float switches. One of these switches is a lower and one is an upper switch. The lower is placed about an inch above the level of biodiesel to be washed, while the upper is placed at the highest point in the tank liquid should reach. The plc turns on the mist via an electrically activated valve when the level turns on the top switch the plc turns off the mist and it starts a timer to allow the wash to settle. After this specified time the plc drains the water with the help of an electric valve to the lower float switch. Then it starts the process over again this can repeated however many times are necessary. The only Human interaction is the turn the system on and drain a small amount of wash water at the end of the entire cycle before the fuel is dried.
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