Low Consistency Refining (LCR)

Application of low consistency refining right after first or second TMP stage and/or high consistence reject refining is a further development and holds important energy saving potential for softwood mechanical pulping. Key process parameters of the technology are:

  • very low specific edge load (0.4 – 0.6 Ws/m);
  • high stock temperature (around 85 C or higher);
  • very uniform feeding and controlled flow conditions (pressure, consistency, flow) (IPW, 2010, 24).

Moreover the production rate increases by 4% to 12%. The energy saving is due to the difference between refining response for LCR versus high consistency refining for a particular freeness range (Martin et al., 2000. p.24).

Development Status Products
Commercial

Low Consistency Refining (LCR)Costs & Benefits

Parent Process: Mechanical Pulping
Energy Savings Potential

The application of 100 to 200 kWh/t in LC refining can replace 200 to 400 kWh/t of high consistency refining at comparable freeness and tensile strenth (IPW, 2010. p. 24)
Energy savings by 142 kWh/t thermomechanical pulp can be achieved.

CO2 Emission Reduction Potential

CO2 savings by 16.3 Kg/t is estimated.

Costs

Low Consistency Refining (LCR) Publications

Page Number: 

24