How is electrical specific energy consumption calculated in a paper mill?

Electrical specific energy consumption is generally calculated by dividing total electrical energy consumed by the tonnes of saleable paper produced during the same period.

How can a paper mill reduce steam consumption?

Paper mills can reduce steam consumption by improving press dryness, correcting dryer drainage, recovering condensate and flash steam, repairing leaks, balancing hood ventilation and stabilising machine operation.

Does installing a VFD always save electricity?

No. A VFD saves energy only where the process duty permits useful speed reduction and the pump, fan or vacuum-system operating requirement has been properly evaluated.

Can excessive vacuum increase paper machine energy consumption?

Yes. Vacuum higher than required for the paper grade and machine condition can increase electrical consumption without producing a proportional improvement in dewatering or sheet dryness.

How does pulp refining affect paper mill energy consumption?

Refining directly consumes electricity and also changes fibre drainage. Excessive refining can increase refiner power and the thermal energy required to remove water in the dryer section.

Can water conservation reduce paper mill energy cost?

Yes. Reduced water use can lower pumping, treatment, heating, cooling, wastewater aeration, sludge handling and tertiary-treatment energy when implemented without harming process quality.