Study on the Optimal Ultrasonic Emulsification System of Bio-diesel Fuel Based on Dds

This paper applies the direct digital frequency synthesis technology (DDS) to build a controllable variable frequency and waveforms of the bio-diesel fuel phacoemulsification system. The optimal operating parameters of phacoemulsification system are studied by orthogonal experiment. In the experiment, the ultrasonic frequency, waveform, power and process time are changed to study the stability of emulsified bio-diesel fuel. According to the results: when the experimental conditions are amount of emulsifier(Span80,Tween80,Methanol) 3%, bio-oil 20% and 0# diesel 80%, the treating time has the most significant in fluency on the stability of the phacoemulsification bio-diesel fuel, power and frequency are less important and waveform is the least. The optimal operating parameter is power of 30W, frequency of 25 KHz, process time of 8min and waveform of square wave pulse. The emulsification stability of the bio-diesel fuel insurance under these conditions is the best; the stable time of bio-diesel fuel reaches to 2256 hours under room temperature.