In the coking process of a coal chemical enterprise of Shaanxi Haotian Group, the gas pressure fan (Roots blower) is driven by a 10kV / 315kW motor, because the gas contains tar, the fan will be adhered with a lot of tar after a long time running with a larger drag torque, and the excess air volume is adjusted by the return valve with serious energy waste.
Obvious energy saving effect, saving power rate reaches nearly 25%;
Motor achieves soft start, without impact on the power grid;
The large torque and low frequency of inverter can meet the heavy load start of roots blower;
Reduced equipment wear, extended lifetime, reduced noise, improved working environment.
The system power factor and degree of automation have been significantly improved.