In this system, a D32 7.5KW inverter drives the 7.5KW mixer motor, drives the stirring fan blades to stir, and then stirs evenly through the vacuum valve, and then sends it to the feed pump to participate in the next chemical reaction after meeting the requirements. The start/stop operation of the frequency converter is realized through the field operation column, and the frequency converter feeds back the actual value of the motor speed to the DCS, and the operator measures the signal and the actual speed value according to the instrument of the mixing tank. Issue a command to the frequency converter to increase or decrease the motor speed reference.