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Contract n° BOS-135(II)-S

Improved Papermaking with Emphasis on Energy Savings and High Consistency Technology
  • O. Terland

Summary

The possibilities of reducing energy consumption in the papermaking process have been studied. The approach was to improve the paper web dewatering in the wire and press sections, by utilizing that an increase in temperature improves the drainage of water. Starting with a 60°C headbox stock temperature, the temperature typically decreases slowly along the wire, then rapidly at the couch and finally slowly in the press section, ending at about 40°C. The rate of cooling was studied as a function of the rate of dewatering by changing various vacuum levels at different positions. The rate of cooling can be decreased by increasing the ambient wet bulb air temperature. This effect was shown by computer modelling. As a separate part of the project, high consistency technology (HC) stock cleaning and forming technologies were evaluated from an energy savings point of view. Estimates based on full scale trials indicate that reductions of the order of 50% in electric energy to pumps and screens can be achieved as a result of the reduced water flow. In addition, sheet formed at high consistency is easier to dewater and results in increased press dryness.

Keywords

High Consistency Paper Machine Press Section Full Scale Trial Papermaking Process 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ECSC, EEC, EAEC, Brussels and Luxembourg 1987

Authors and Affiliations

  • O. Terland
    • 1
  1. 1.Paper Technology DepartmentSwedish Pulp and Paper Research InstituteSweden

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