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TMP properties and refiner conditions in a CD82 chip refiner at different operation points. Part II: Comparison of the five tests

  • Rita Ferritsius EMAIL logo , Olof Ferritsius , Jan Hill , Anders Karlström and Karin Eriksson
Published/Copyright: May 23, 2018
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Abstract

This paper is part two of a study on a CD 82 TMP chip refiner where relations between changes in the process conditions and changes in the properties of the produced pulp are investigated. Focus is on the ratio between tensile index and specific energy consumption when results from five tests are compared. Pulp properties were measured for composite pulp samples taken from the refiner blow line. Residence times and pulp consistencies were estimated by use of the extended entropy model. Clearly, an increase in specific energy does not necessarily implicate an increase in strength properties of the pulp produced. It is of high importance to have access to information about the refining zone conditions when searching for an optimal operation point in terms of the ratio between tensile index and specific energy. In these tests, this ratio had a maximum at about 55 % measured blow line consistency. Unfavourable operating conditions were identified at high pulp consistencies, especially after the FZ, where pulp consistencies well above 70 % were observed. The estimated residence time for each refining zone responded differently when applying changes in production rate, plate gaps and dilution water flow rates. In conclusion, the results associated with estimated pulp consistencies where easier to interpret compared with results for residence times, implying that additional tests are required for the latter variable. In addition to tensile index, pulp properties like freeness, Somerville shives and light scattering coefficient were included in the analysis.

Funding statement: This publication is part of the Energy Efficient Mechanical Pulping (e2mp) program at Mid Sweden University funded by the Knowledge Foundation, Stora Enso, SCA, Holmen, and Valmet. Special thanks to all who gave support to these trials and testing of the pulps.

  1. Conflict of interest: The authors do not have any conflicts of interest to declare.

Appendix

Table 4

Test 2.

Composite Pulp Sample212223242526272829
Load, MW23.724.624.923.321.923.124.224.221.4
Gap FZ, mm1.351.201.051.211.371.351.361.351.36
Gap CD, mm0.780.790.780.770.770.790.780.750.78
Dil. water FZ, l/s3.423.433.433.433.433.363.263.173.43
Dil. water CD, l/s5.235.245.245.235.235.235.235.245.23
Prod., admt/h15.915.915.915.915.915.915.915.915.9
SE., kWh/admt149315521569147313811457152515271353
Calc. conc. FZ, %76.784.389.877.969.375.981.082.068.2
Calc. conc. CD, %60.064.165.458.953.758.664.065.352.3
Tot. res. time, s1.231.281.301.231.171.221.281.301.15
Res. time ratio FZ/CD1.030.980.971.041.111.051.000.991.13
Force FZ 3, N1.111.201.261.191.211.151.111.131.26
Pulp conc., %57.661.062.657.053.558.962.564.253.8
Freeness, ml CSF198192182197225202192193230
Fiber length (ww), mm2.111.961.922.152.292.202.032.012.31
CWT, μm7.88.07.87.97.88.07.97.98.0
Fibrillation, %5.435.645.625.395.565.826.065.675.62
Curl, %14.113.613.513.613.613.913.813.413.6
Somerville, %1.611.151.041.461.781.441.321.341.79
Density, kg/m3329352362343330343348358326
Tensile index, Nm/g27.727.228.030.129.729.627.327.129.1
Elongation, %1.781.711.731.821.731.791.781.731.83
Tear index, mNm2/g6.375.725.866.727.216.885.956.117.27
Light scatt. coeff. m2/kg45.347.748.145.943.245.547.047.843.5
Table 5

Test 3.

Composite Pulp Sample31323334
Load, MW22.422.122.121.9
Gap FZ, mm1.231.241.221.23
Gap CD, mm0.630.570.630.64
Dil. water FZ, l/s3.783.793.783.79
Dil. water CD, l/s5.125.115.125.06
Prod., admt/h15.015.015.015.0
SE., kWh/admt1496147614701463
Calc. conc. FZ, %60.758.059.859.5
Calc. conc. CD, %50.649.649.449.5
Tot. res. time, s1.031.151.151.15
Res. time ratio FZ/CD1.130.990.990.99
Force FZ 3, N1.231.281.271.25
Pulp conc., %51.451.450.850.8
Freeness, ml CSF214212213220
Fiber length (ww), mm2.222.212.282.20
CWT, μm7.97.97.87.9
Fibrillation, %5.485.315.725.72
Curl, %14.513.714.814.0
Somerville, %1.781.881.751.86
Density, kg/m3316328337340
Tensile index, Nm/g26.826.327.827.9
Elongation, %1.781.711.771.78
Tear index, mNm2/g6.426.366.826.79
Light scatt. coeff. m2/kg44.044.243.843.9
Table 6

Test 4.

Composite Pulp Sample353637383940414243444546474849
Load, MW19.719.619.719.519.621.521.521.621.321.322.522.522.322.422.5
Gap FZ, mm1.481.481.481.491.481.481.471.471.481.481.491.481.481.481.48
Gap CD, mm1.141.141.131.131.141.151.151.151.151.141.111.121.141.141.13
Dil. water FZ, l/s3.393.393.393.393.403.413.403.403.393.393.383.413.403.433.38
Dil. water CD, l/s3.893.883.883.883.883.883.883.883.883.893.883.893.883.893.88
Prod., admt/h12.512.512.512.512.514.414.414.414.414.415.915.915.915.915.9
SE., kWh/admt158015661578156415681490149414971478148214181415140314101418
Calc. conc. FZ, %75.575.075.074.174.276.076.476.575.275.676.676.275.875.677.6
Calc. conc. CD, %-58.658.657.657.764.564.965.263.964.265.965.465.065.366.1
Tot. res. time, s1.591.581.581.571.571.471.481.481.461.471.361.351.351.351.36
Res. time ratio FZ/CD0.850.850.850.860.860.800.800.800.810.810.800.800.800.800.80
Force FZ 3, N0.560.550.560.580.580.790.780.800.780.790.991.021.000.990.99
Pulp conc., %56.763.260.358.958.867.768.570.464.065.870.873.270.969.575.8
Freeness, ml CSF183198190191194235235260226253303327295280307
Fiber length (ww), mm2.342.332.322.332.322.312.312.282.302.312.332.342.342.362.28
CWT, μm7.67.77.87.77.77.97.98.07.97.98.18.28.08.08.3
Fibrillation, %6.76.476.426.386.66.136.246.186.096.196.156.126.286.155.97
Curl, %15.315.115.114.915.414.414.614.514.614.614.614.615.014.814.2
Somerville, %0.880.920.850.780.951.261.271.221.321.281.401.541.431.391.34
Density, kg/m3362355360360364341352350356346336337339350339
Tensile index, Nm/g34.431.633.132.932.928.128.628.030.528.425.524.527.228.124.9
Elongation, %1.921.831.861.911.881.751.661.671.711.691.531.561.631.681.56
Tear index, mNm2/g7.477.227.597.317.377.166.956.486.936.616.196.236.556.836.06
Light scatt. coeff. m2/kg47.547.447.347.147.346.047.147.447.346.445.244.645.245.444.9
Table 7

Test 5.

Composite Pulp Sample505152535455565758596061626364
Load, MW21.922.322.122.122.618.418.118.518.918.720.019.018.817.617.4
Gap FZ, mm0.870.870.860.860.870.850.850.860.860.860.850.860.850.850.86
Gap CD, mm0.670.670.670.670.650.650.640.650.650.650.670.660.660.650.65
Dil. water FZ, l/s3.293.283.283.283.283.513.513.513.513.513.513.513.513.513.52
Dil. water CD, l/s4.694.704.704.694.704.694.694.694.694.694.454.444.454.444.44
Prod., admt/h14.214.214.214.214.214.314.314.314.314.314.214.214.214.214.2
SE., kWh/admt154015681555155515881285126412971321130614071339132212431223
Calc. conc. FZ, %61.262.562.162.262.553.452.953.654.353.956.454.654.252.451.9
Calc. conc. CD, %57.759.258.458.560.445.444.745.746.846.251.548.848.145.244.5
Tot. res. time, s1.161.171.171.171.181.041.031.041.051.051.101.071.061.041.03
Res. time ratio FZ/CD0.940.920.930.930.901.111.131.111.091.101.011.051.061.111.12
Force FZ 3, N1.561.641.621.631.681.281.271.301.321.311.421.291.301.251.26
Pulp conc., %59.061.259.660.761.445.043.745.548.048.649.049.748.744.344.4
Freeness, ml CSF190194194203205262270259252253214235244286295
Fiber length (ww), mm2.292.242.222.242.192.332.392.392.342.372.342.382.352.332.38
CWT, μm7.87.87.97.88.07.87.87.87.87.97.97.87.77.67.7
Fibrillation, %6.36.36.46.296.25.926.036.056.036.126.166.056.045.916.12
Curl, %14.714.514.514.914.413.714.013.614.013.914.213.914.113.813.9
Somerville, %0.860.760.750.800.641.752.001.661.751.721.321.421.752.242.28
Density, kg/m3372375376381373333329340340338348333329331327
Tensile index, Nm/g34.233.833.933.532.127.926.828.529.128.831.229.027.226.025.8
Elongation, %1.801.831.811.911.821.761.711.761.811.761.851.781.781.681.75
Tear index, mNm2/g7.447.517.747.547.127.186.887.167.147.107.357.266.926.756.44
Light scatt. coeff. m2/kg46.647.247.146.547.143.243.042.843.443.544.543.543.142.041.9

References

Backlund, H.-O. (2004) Measurement of shear force, temperature profiles and fibre development in mill-scale TMP refiners. Licentiate thesis, Mid Sweden University ISBN 91-87908-81-6.Search in Google Scholar

Bussiere, S., Vuorio, P., Ullmar, M., Hensley, E., Arid, J., Huhtanen, J.-P. (2007) Mill scale development towards high-production, low-energy TMP refining line. In: Prceedings, Int. Mech. Pulping Conf., Minneapolis, USA.Search in Google Scholar

Deer, G., Carello, G., Fox, B., Cloutier, D. (2005) Power cost reduction through advanced quality control and refiner segment change at Tembec Pine Falls. In: Prceedings, Int. Mech. Pulping Conf., Minneapolis, USA.Search in Google Scholar

Engstrand, P., Engberg, B., Eds. (2014) Filling the Gap – Final report. Report series FSCN 2014:57, Mid-Sweden University, Sundsvall, Sweden, ISSN 1650-5387.Search in Google Scholar

Ettaleb, L., Roche, A.A., Miles, K. (2005) Method of refining wood chips or pulp in a high consistency conical disc refiner. Patent number: US7240863 B2.Search in Google Scholar

Ferritsius, O. (1996) Control of fundamental pulp properties in TMP and SGW production by the use of factor analysis. In: SPCI, Stockholm, Sweden.Search in Google Scholar

Ferritsius, R., Ferritsius, O., Hill, J., Karlström, A., Eriksson, K. (2018) TMP properties and process conditions in a CD82 chip refiner at different operation points Part I: Step changes of the process variables, description of the separate tests. Nord. Pulp Pap. Res. J. accepted.10.1515/npprj-2018-3002Search in Google Scholar

Ferritsius, R., Ferritsius, O., Hill, J., Karlström, A., Ferritsius, J. (2017) Process considerations and its demands on TMP property measurements – A study on tensile index. Nord. Pulp Pap. Res. J. 32(1):45–53.10.3183/npprj-2017-32-01-p045-053Search in Google Scholar

Ferritsius, R., Hill, J., Ferritsius, O., Karlström, A. (2014) On energy efficiency in chip refining. In: Proceedings, Int. Mech. Pulping Conf., Helsinki, Finland.Search in Google Scholar

Ferritsius, O., Jämte, J., Ferritsius, R.: (1989) Single and double disc refining at Stora Kvarnsveden. In: Prceedings, Int. Mech. Pulp. Conf., Helsinki, Finland, pp. 58–71.Search in Google Scholar

Fostokjian, R., Arid, J., Vuorio, P., Huhtanen, J.-P. (2005) Development results in reducing of refining energy consumption at Tempec paper group – Spruce Falls operations. In: Int. Mech. Pulping Conf., Oslo, Norway.Search in Google Scholar

Härkönen, E., Huusari, E., Ravila, P. (1999) Residence time of fiber in a single disc refiner. In: Proceedings, Int. Mech. Pulping Conf., Huston, USA.Search in Google Scholar

Härkönen, E., Tienvieri, T. (1995) The influence of production rate on refining in a specific refiner. In: Int. Mech. Pulping Conf., Ottawa, Canada.Search in Google Scholar

Hill, J. (1993) Process understanding profits from sensor and control developments. In: Int. Mech. Pulping Conf.Search in Google Scholar

Hill, J., Saarinen, K., Stenros, R. (1993) On the control of chip refining systems. Pulp Pap. Can. 94(6):43–47.Search in Google Scholar

Johansson, O., Hogan, D., Blankenship, D., Snow, E., More, W., Qualls, R., Pugh, K., Wonderer, M. (2001) Improved process optimization through adjustable refiner plates. In: Proceedings, Int. Mech. Pulping Conf., Helsinki, Finland.Search in Google Scholar

Johansson, B.-L., Karlsson, H., Jung, E. (1980) Experiences with computer control, based on optical sensors for pulp quality, of a two-stage TMP-plant. In: Proceedings, Process Control Conf., Halifax, Nova Scotia, Canada.Search in Google Scholar

Johansson, O., Richardson, J. (2005) The effect of refining zone temperature on refining efficiency and pulp quality. In: Proceedings, Int. Mech. Pulping Conf., Oslo, Norway.Search in Google Scholar

Karlström, A., Eriksson, K. (2014) Fiber energy efficiency Part I–IV. Nord. Pulp Pap. Res. J. 29(2):322–331, 332–343, and 29(3):401–408, 409–417.10.3183/npprj-2014-29-02-p322-331Search in Google Scholar

Karlström, A., Hill, J., Ferritsius, R., Ferritsius, O. (2015) Pulp property development Part I: Interlacing undersampled pulp properties and TMP process data using piece-wise linear functions. Nord. Pulp Pap. Res. J. 30(4):599–608.10.3183/npprj-2015-30-04-p599-608Search in Google Scholar

Karlström, A., Hill, J., Ferritsius, R., Ferritsius, O. (2016a) Pulp property development Part II: Process nonlinearities and its influence on pulp property development. Nord. Pulp Pap. Res. J. 31(2):287–299.10.3183/npprj-2016-31-02-p287-299Search in Google Scholar

Karlström, A., Hill, J., Ferritsius, R., Ferritsius, O. (2016b) Pulp property development Part III: Fiber residence time and consistency profile impact on specific energy and pulp properties. Nord. Pulp Pap. Res. J. 31(2):300–307.10.3183/npprj-2016-31-02-p300-307Search in Google Scholar

Karlström, A., Isaksson, A. (2009) Multi-rate optimal control of TMP refining processes. In: Proceedings, Int. Mech. Pulping Conf., Sundsvall, Sweden.Search in Google Scholar

Miles, K.B., May, W.D. (1989) The flow of pulp in chip refiners. In: Int. Mech. Pulping Conf., Helsinki, Finland, Tappi, Peachtree Corners, GA, USA.Search in Google Scholar

Strand, B.C., Mokvist, A., Falk, B., Jackson, M. (1993) The effect of production rate on specific energy consumption in high consistency chip refining. In: Proceedings, Int. Mech. Pulping Conf., Oslo, Norway.Search in Google Scholar

Tistad, G., Asklund, S., Görfelt, P. (1981) TMP for newsprint produced by single stage refining with and without conical periphery segments. Operating experience from Hallsta Paper mill. In: Proceedings, Int. Mech. Pulping Conf., Oslo, Norway.Search in Google Scholar

Vikman, K., Vuorio, P., Huhtanen, J.-P., Huhtokari, J. (2005) Residence time measurements for a mill scale high consistency CD refiner line. In: Proceedings, Int. Mech. Pulping Conf., Oslo, Norway.Search in Google Scholar

Received: 2016-09-21
Accepted: 2017-12-12
Published Online: 2018-05-23
Published in Print: 2018-05-23

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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  2. Publisher’s note
  3. Now at De Gruyter: Nordic Pulp & Paper Research Journal
  4. Editorial
  5. News from Nordic Pulp & Paper Research Journal
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  7. Optimum strategies for pulp fractions refining
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  13. Control strategies for refiners Part II: Consistency control in twin-disc refining zones using temperature profile information
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  15. TMP properties and refining conditions in a CD82 chip refiner. Part I: Step changes of process variables, description of the tests
  16. TMP properties and refiner conditions in a CD82 chip refiner at different operation points. Part II: Comparison of the five tests
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