Power–gap relationships in low consistency refining
Source abstract
Abstract
Abstract Distance between stationary and rotating refining plates, gap, has a direct and significant impact on refining power. Gap is almost universally used to control power in low consistency refining operations. The relationship between power and gap are affected by refiner size, pulp type, plate pattern and refining conditions. In this study, a correlation was developed to describe the power–gap relationships at a wide range of refining conditions and furnish. The correlation was developed using pilot-scale refining data of mechanical pulps. Results showed that a properly defined dimensionless power number is suitable to describe refining power as well as to compare different refiners under the same grounds. The developed correlation was also used to predict mill-scale refining data showing good agreement with between predicted and measured values. Finally, experimental data from force sensor measurements supports the correlation’s theoretical assumptions.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Manufacturing Process and Optimization
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Chemical and Biological Engineering , University of British Columbia , Vancouver , Canada
Mechanical Engineering , University of British Columbia , Vancouver , Canada
Funding
Natural Sciences and Engineering Research Council of Canada
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. 27:702–706.10.3183/npprj-2012-27-04-p702-706 ↗
2. Backlund, H.O. (2004). Measurement of Shear Force, Temperature Profiles and Fibre Development in Mill-Scale TMP Refiners. Licentiate thesis, Mid Sweden University.
3. Bürger, R., Concha, F., Karlsen, K.H. (2001) Phenomenological model of filtration processes: 1. Cake formation and expression. Chem. Eng. Sci. 56:4537–4553.10.1016/S0009-2509(01)00115-4 ↗
4. Elahimehr, A., Olson, J.A., Martinez, D.M. (2013) Understanding LC refining: The effect of plate pattern and refiner operation. Nord. Pulp Pap. Res. J. 28(3):386–391.10.3183/npprj-2013-28-03-p386-391 ↗
5. 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-p836-843 ↗
6. Elahimehr, A., Olson, J.A., Martinez, D.M., Heymer, J. (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(4):609–616.10.3183/npprj-2015-30-04-p609-616 ↗
7. Eriksen, O., Holmqvist, C., Mohlin, U.B. (2008a) Fibre floc drainage – A possible cause for substantial pressure peaks in low-consistency refiners. Nord. Pulp Pap. Res. J. 23(3):321–326.10.3183/npprj-2008-23-03-p321-326 ↗
8. Eriksen, O., Holmqvist, C., Mohlin, U.B. (2008b) Theoretical outline of the cause for observed cavitation in a low-consistency refiner. Nord. Pulp Pap. Res. J. 23(3):315–320.10.3183/npprj-2008-23-03-p315-320 ↗
9. Harirforoush, R., Olson, J., Wild, P. (2017) In-process detection of fiber cutting in low consistency refining based on measurement of forces on refiner bars. Tappi J. 16(4):189–199.10.32964/TJ16.4.189 ↗
10. Harirforoush, R., Olson, J., Wild, P. (2018) Indications of the onset of fiber cutting in low consistency refining using a refiner force sensor: the effect of pulp furnish. Nord. Pulp Pap. Res. J. 33(1):48–57.10.1515/npprj-2018-3013 ↗
11. Harirforoush, R., Wild, P., Olson, J. (2016) The relation between net power, gap, and forces on bars in low consistency refining. Nord. Pulp Pap. Res. J. 31(1):71–78.10.3183/npprj-2016-31-01-p071-078 ↗
12. Herbert, W., Marsh, P.G. (1968) Mechanics and fluid dynamics of a disk refiner. Tappi J. 51(5):235–239.
13. 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-p283-287 ↗
14. Kerekes, R.J. (2010) Energy and forces in refining. J. Pulp Pap. Sci. 36(1–2):10–15.
15. Kerekes, R.J. (2011) Force-based characterization of refining intensity. Nord. Pulp Pap. Res. J. 26(1):14–20.10.3183/npprj-2011-26-01-p014-020 ↗
16. 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.
17. Landman, K.A., Sarikoff, C., White, L.R. (1991) Dewatering of flocculated suspensions by pressure filtration. Phys. Fluids A, Fluid Dyn. 3(6):1495–1509.10.1063/1.857986 ↗
18. Landman, K.A., White, L.R. (1994) Solid/liquid separation of flocculated suspensions. Adv. Colloid Interface Sci. 51(29):175–246.10.1016/0001-8686(94)80036-7 ↗
19. Leider, P.J., Nissan, H. (1977) Understanding the disk refiner. Tappi J. 60(10):85–89.
20. 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-p882-885 ↗
21. Mohlin, U.B. (2003) On the complexity of LC refining: Changing consistency and flow rate in the beloit DD refiner. In: 7th International Refining Conference. PIRA International.
22. Mohlin, U.B. (2006) LC-refining of chemical pulps – Refining intensity and gap clearance. In: 9th International Refining Conference. PIRA International.
23. Olender, D., Wild, P., Byrnes, P., Ouellet, D., Sabourin, M. (2007) Forces on bars in high-consistency mill-scale refiners: Trends in primary and rejects stage refiners. J. Pulp Pap. Sci. 33(3):1–9.
24. Prairie, B., Wild, P., Byrne, P., Olender, D., Francias, B., Oluellet, D. (2008) Forces During Bar-Passing Events in Low-Consistency Refining: Distributions and Relationships to Specific Edge Load. University Report, PUR 946.
25. Prairie, B., Wild, P., Byrnes, P., Olender, D., Francis, D.W., Ouellet, D. (2007) Forces during bar-passing events in low consistency refining: Effects of refiner tram. Pulp Pap. Can. 109(9):34–47.
26. Rajabi Nasab, N., Olson, J.A., Heymer, J., Martinez, D.M. (2013) Understanding of No-load power in low consistency refiners. Can. J. Chem. Eng. 92(3):524–535.10.1002/cjce.21818 ↗
27. Riazoshams, H., Habshah Jr., M., Adam, M. (2009). On the outlier detection in nonlinear regression. Int. J. Math. Comput. Phys. Electr. Comput. Eng. 3(12):1105–1111.
28. Roux, J.C., Franc, N., Duffy, G.G., Fabry, B. (2001) Shear factor. A new way to characterize fibre suspension shear. Tappi J. 84(8):46–63.
29. Rubiano Berna, J.E., Martinez, D.M., Olson, J.A. (2018). A comminution model parametrization for low consistency refining. Powder Technol. 328:288–299.10.1016/j.powtec.2018.01.031 ↗