Investigation of low consistency reject refining of mechanical pulp for energy savings
Source abstract
Abstract
Abstract In this study, the effects of low consistency refining (LCR) energy and intensity on mechanical pulp properties have been studied for three different types of reject pulps (softwood TMP, softwood CTMP and hardwood CTMP), which were refined at varying intensity. Resulting pulp properties have been compared with high consistency refining (HCR) of the same reject pulps. For all furnish types, it was shown that LCR can develop pulp properties matching those developed through HCR with significantly less energy. The resulting pulp properties were found to be affected not only by refining intensity and energy, but also by initial fibre morphology. Pilot LCR trials demonstrated that high freeness reject pulp is initially insensitive to refining intensity as specific energy is applied. This enables the first stage of LCR to be carried out at a higher specific energy and intensity, which can reduce the number of stages of LCR required to reach a target quality. This work shows that low intensity LCR is capable of achieving the same tensile index as HCR pulp at a target freeness of 200 ml CSF.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Advanced Cellulose Research Studies · Lignin and Wood Chemistry · Material Properties and Processing
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Allnorth , 1200-1100 Melville St , Vancouver , Canada , V6E 4A6 (former affiliation: University of British Columbia)
University of British Columbia , Pulp and Paper Centre , 2385 East Mall , Vancouver , Canada , V6T 1Z4
References (29)
Show source-provided references
1. Andersson, S., Sandberg, C., Engstrand, P. (2012) Effect of long fibre concentration on low consistency refining of mechanical pulp. Nord. Pulp Pap. Res. J. 27(4):702–706.10.3183/npprj-2012-27-04-p702-70610.3183/npprj-2012-27-04-p702-706 ↗
2. Bonham, J.S., Flowers, A.G., and Schofield, A.J. (1983) Post refining of radiata TMP. Appita J. 36(6):466–470.10.1093/oxfordjournals.pa.a051907 ↗
3. Brecht, W. (1967) Method for comparative evaluation of bar-equipped beating devices. Tappi 50(8):40–44.
4. Chang, X.F., Bridges, C., Yu, D., Kuan, D., Kuang, L., Olson, J.A., Luukkonen, A., Beatson, R.P. (2011) Saving electrical energy by alkaline peroxide pretreatment of TMP prior to low consistency refining. PAPTAC Peer-Rev. Tech. Pap., July–August 2011 Issue.
5. Chang, X.F., Olson, J.A., Beatson, R.P. (2012) A comparison between the effects of ozone and alkaline peroxide treatments on TMP properties and subsequent low consistency refining. BioResources 7(1):99–111.10.15376/biores.7.1.99-111 ↗
6. Elahimehr, A., Olson, J.A., Martinez, D.M. (2015) Low consistency refining of mechanical pulp: How plate pattern and refiner operating conditions change the final properties of pulp. Nord. Pulp Pap. Res. J. 30(04):609–616.10.3183/npprj-2015-30-04-p609-61610.3183/npprj-2015-30-04-p609-616 ↗
7. Elahimehr, A., Olson, J.A., Martinez, D.M., Heymer, J. (2012) Estimating the area and number of bar crossings between refiner plates. Nord. Pulp Pap. Res. J. 27(5):836–843.10.3183/npprj-2012-27-05-p836-84310.3183/npprj-2012-27-05-p836-843 ↗
8. Eriksen, O., Hammar, L.A. (2007) Refining mechanisms and development of TMP properties in a low-consistency refiner. In: Int. Mech. Pulp. Conf., Minneapolis, MN, USA, June 7–9, 2007. TAPPI Press, Norcross, GA, USA. pp. 62–75.
9. Fernando, D., Gorski, D., Sabourin, M., Daniel, G. (2014) Characterization of fiber development in high- and low-consistency refining of primary mechanical pulp. Holzforschung 67(7):735–745.10.1515/hf-2012-0135 ↗
10. Flowers, A.G., Pearson, A.J., and Tyler, A.G. (1979) A preliminary report on single stage TMP pulping of P. radiata followed by post refining. Appita J. 33(3):195–200.
11. Goosen, D.R., Olson, J.A., Kerekes, R.J. (2007) The role of heterogeneity in compression refining. J. Pulp Pap. Sci. 33(2):110–114.
12. Gorski, D., Luukkonen, A., Sabourin, M., Olson, J.A. (2012a) Two-stage low-consistency refining of mechanical pulp. Appita J. 65(3):244–249.
13. Gorski, D., Mörseburg, K., Olson, J.A., Luukkonen, A. (2012b) Fibre and fines quality development in pilot scale high and low consistency refining of ATMP. Nord. Pulp Pap. Res. J. 27(5):872–881.10.3183/npprj-2012-27-05-p872-88110.3183/npprj-2012-27-05-p872-881 ↗
14. Hammar, L.A., Htun, M., Svensson, B. (1997) Two-stage refining process to save energy for mechanical pulps. In: Int. Mech. Pulp. Conf., Stockholm, Sweden, June 9–13, 1997. SPCI, Stockholm, Sweden. pp. 257–261.
15. Hammar, L.Å., Salmén, L., Sandberg, C., and Sundström, L. (2010) The effect of process conditions on pulp quality development in low consistency refining of mechanical pulp – TMP. Appita J. 63(5):377–380.
16. Heymer, J., Olson, J.A., Kerekes, R.J. (2011) The role of multiple loading cycles on pulp in refiners. Nord. Pulp Pap. Res. J. 26(3):283–287.10.3183/npprj-2011-26-03-p283-28710.3183/npprj-2011-26-03-p283-287 ↗
17. Kerekes, R.J. (1990) Characterization of pulp refiners by a C-factor. Nord. Pulp Pap. Res. J. 5(1):003–008.10.3183/npprj-1990-05-01-p003-00810.3183/npprj-1990-05-01-p003-008 ↗
18. Kerekes, R.J. (2010) Energy and forces in refining. J. Pulp Pap. Sci. 36(1–2):10–15.
19. Kerekes, R.J., Senger, J.J. (2006) Characterizing refining action in low-consistency refiners by forces on fibres. J. Pulp Pap. Sci. 32(1):1–8.
20. Lumiainen, J. (1990) New theory can improve practice. PPI Pulp Pap. Int. 32(8):46–47, 54.
21. Luukkonen, A. (2011) Development of a methodology to optimize low consistency refining of mechanical pulp. Ph.D. Thesis, University of British Columbia, Vancouver, BC, Canada.
22. Luukkonen, A., Olson, J.A., Martinez, D.M. (2010) Low consistency refining of mechanical pulp, effect of gap, speed and power. J. Pulp Pap. Sci. 36(1–2):28–34.
23. Luukkonen, A., Olson, J.A., Martinez, D.M. (2012) Low consistency refining of mechanical pulp: Relationships between refiner operating conditions and pulp properties. Nord. Pulp Pap. Res. J. 27(5):882–885.10.3183/npprj-2012-27-05-p882-88510.3183/npprj-2012-27-05-p882-885 ↗
24. Muenster, H., Ferritsius, O., Lecourt, M., and Petit-Conil, M. (2006) High temperature LC/MC refining offers TMP energy advantages. In: RISI Pulp Pap., July 2006. pp. 44–49.
25. Roux, J.C. (2001) Stock preparation part 1 – Pulp treatment processes. In: Sci. Pap., 12th Fund. Res. Symp., Oxford, England, September 17–21, 2001. Ed. Baker, C.F. FRC, London, England. pp. 19–80.
26. Sabourin, M. (2007) Minimizing TMP energy consumption using a combination of chip pre-treatment, RTS and multiple stage low consistency refining. In: Int. Mech. Pulp. Conf., Minneapolis, MN, USA, June 7–9, 2007. TAPPI Press, Norcross, GA, USA. pp. 839–893.
27. Sandberg, C., Engstrand, P., and Berg, J.E. (2016) System aspects on low consistency refining of mechanical pulp. In: Int. Mech. Pulp. Conf. (IMPC) 2016, Jacksonville, FL, USA. TAPPI Press, Norcross, GA, USA, pp. 167–177.
28. Sandberg, C., Sundström, L., Nilsson, L. (2009) Potential of low consistency refining of TMP – Mill evaluation. In: Int. Mech. Pulp. Conf., Sundsvall, Sweden, May 31–June 4, 2009. SPCI, Stockholm, Sweden. pp. 186–189.
29. Vaughn, J.W., Mitchell, G.W., Musselman, R.L. (1998) Third stage, low consistency refining of TMP mill experience on southern pine. In: Int. Mech. Pulp. Conf., Montreal, Canada, October 25–29, 1998. TAPPI Press, Norcross, GA, USA, pp. 379–390.