Abstract:

Simulated evaporation experiments were carried out by using a self-designed scale-preveniing apparatus with the synergistic action of ultrasonic field and electrostatic field.The orthogonal experiment result shows that ex-cellent synergistic effect can be obtained when the ultrasonic field intensity and the electrostatic field intensity are respectively 0.53 W/cm²and 32 kV/m,and an inhibition rate of 78.46% is achieved.The results of iodine release
experiment show that the ultrasonic cavitation is enhanced by electrostatic field,and that the microscopic energy caused by the ultrasonic cavitation is absorbed by the supersaturated solution in the action of ultrasonic field.Thus,the induction period of CaCO₃ crystal is shortened and the nucleation rate is accelerated,which makes the crystals become stable in the form of aragonite suspending but not depositing in the solution,that is to say,the scale is effectively prevented.

Key words: ultrasonic field, electrostatic field, synergistic action, scale prevention