Pakistan Sugar Mill Case - INVT Goodrive5000 Medium Voltage VFD

Sugar is an important food material in our daily life.

Sugar is an important food material in our daily life. The most of sugar is made from sugarcane. The sugarcane mill factory normally use sugarcane mill and sugar extraction technology to produce sugar. In Pakistan sugar industry there are some factories use steam turbines to drive shredders and squeezers. This system is an old technology and has many disadvantages. Such as engine pressure is not stable, steam turbine system is too noise, steam pipe is hard and costly to maintenance and steam turbine has low steam using efficiency.

Along with development of inverter technology, more and more AC motor and VFD instead of old traditional technology which is steam turbine. This new technology can deal with all of steam turbine disadvantages and also can bring other benefits such as stepless speed regulation, energy saving and low speed high torque.

HAMZA SUGAR MILL factory is located in the Rahimayar Khan Punjab province. It is the biggest sugarcane mill factory in the whole of Asian. The capacity of sugarcane mill is about 30,000 tons/day. It has three sugarcane mill lines, one line is HAMZA 01, another line is MADINA and the last line is HAMZA 02.

Right now all of sugarcane mill lines use steam turbines driving the squeezers. Due to there are many disadvantages by using steam turbines, the customer wants transform one of steam turbines for example by VFD renovation.

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After using VFD and AC motor, here are some advantages as follow,

1. Low speed high torque; Motor running at 1Hz can support 150% torque.

2. Energy saving; Before using VFD, the power consumption is 1000KW(Only calculate the power, doesn’t mention driven by turbine or electric power) ,after using VFD the power consumption is 6.6KV*55A*0.96*1.732=603.5KW; So the energy saving is (1000-603.5)KW/1000KW=39.6%.

3. Very low torque pulse without causing the resonance between the motor and other mechanical devices, and reducing the transmission mechanism wearing.

4.Perfect output wave, less than 4% of distortion.

5.Easily controlled by DCS system and remote control;

6.Reduce the loss of shutdown maintenance and save plenty of maintenance costs.

5.Conclusion

Compared with original steam turbine system, the VFD system has much more advantages. The VFD system is easily controlled by REMOTE box and the VFD running speed can automatic adjusted from 0Hz to 50 Hz. The upgraded inverter system works well, customers are satisfied.

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