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Experimental and Theoretical Study of Heat Losses in Drying Cylinders

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V.P. Sivakov, A.V. Vurasko, N.V. Kutsubina

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UDС

676.056.5

Abstract

The research purpose is to develop methods for determination of heat losses in drying cylinders. Experimental study of temperature of drying cylinders performed in the drying section of a paper machine during its steady-state operation. Medium, maximum and permissible statistical characteristics of drying cylinder temperatures were defined. The drying cylinders with increased condensation concentration were determined by the minimally permissible temperature levels and the repair of the condensation drainage system to reduce heat losses (steam consumption) was justified. The cause of uneven dryness of the paper web across the width has been determined. The condensate ring on the inner wall at the edges of the drying cylinders gets thickened due to moisture coming from the end caps from the action of centrifugal forces. The condensation is removed from the drying cylinders with a siphon on the drive side. Therefore, on the front side of the drying cylinders condensate film has a greater thickness, and the paper web dries worse. The single-sided condensate disposal and the physical effect of centrifugal condensate runoff from the end caps to the side inner surface of the drying cylinders cause a lower dryness from the front side of the paper web. The use of thermal insulation of end caps will contribute to uniform dryness across the width of the paper web. The results of experimental studies were processed by methods of mathematical statistics in order to describe the thermal losses during contact drying of the paper web on drying cylinders with and without thermal insulation of the end caps to the ambient air. The calculation of heat losses is carried out according to the refined method of researching thermal processes in contact drying of paper web. It is found, that the use of thermal insulation of the end caps of the drying cylinders provides a reduction in steam consumption for contact drying of the paper web without affecting the technological process. The research results can be used to reduce heat losses in the drying section of paper machines on cylinders that do not have thermal insulation of the end caps. For instance, for a paper machine consisting of 56 cylinders with a diameter of 1500 mm and a capacity of 7000 kg/h of absolutely dry paper, insulating their end caps saves up to 223 kg/h of steam for drying the paper web. Methods of detection of drying cylinders with increased content of condensation on permissible levels of temperature is developed and approved. A refined method for determining thermal losses during contact drying of the paper web on drying cylinders has been developed.

Authors

Valeriy P. Sivakov, Doctor of Engineering, Prof.;
ResearcherID: AAC-6084-2021, ORCID: https://orcid.org/0000-0002-9387-1512
Alesya V. Vurasko, Doctor of Engineering, Prof.;
ResearcherID: AAC-5594-2021, ORCID: https://orcid.org/0000-0002-9471-085X
Nelli V. Kutsubina, Candidate of Engineering, Assoc. Prof.;
ResearcherID: AAC-4846-2021, ORCID: https://orcid.org/0000-0002-0438-406X

Affiliation

Ural State Forest Engineering University, ul. Sibirskiy trakt, 37, Yekaterinburg, 620100, Russian Federation; e-mail: vurasko2010@yandex.ru, sivakov.VP@usfeu.ru, Nelly3416@mail.ru

Keywords

drying cylinder, temperature of end cups, diagnosis, heat capacity, cooling, thermal insulation, heat losses, saving

For citation

Sivakov V.P., Vurasko A.V., Kutsubina N.V. Experimental and Theoretical Study of Heat Losses in Drying Cylinders. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 2, pp. 169–179. DOI: 10.37482/0536-1036-2021-2-169-179

References

  1. Bel’skiy A.P. Design and Calculation of Heat Exchange (Drying) Plants. Leningrad, LTA Publ., 1992. 115 р.
  2. Bel’skiy A.P., Lotvinov M.D. Ventilation of Paper Machines. Moscow, Lesnaya promyshlennost’ Publ., 1990. 215 p.
  3. Bushmelev V.A., Vol’man N.S. Processes and Apparatus for Pulp and Paper Production. Moscow, Lesnaya promyshlennost’ Publ., 1969. 352 p.
  4. Ershov Yu.G., Sannikov V.A. Condensate Economy of Pulp and Paper Mills. Moscow, Lesnaya promyshlennost’ Publ., 1989. 263 p.
  5. Kurov B.C., Kokushin N.N. Theory and Design of Machinery and Equipment of the Industry. Paper and Board Machines. Saint Petersburg, Polytech Publ., 2006. 588 p.
  6. Sivakov V.P., Vurasko A.V., Leonovich A.A. Fundamentals of Scientific Research in Chemical and Chemical-Mechanical Processing of Plant Raw Materials. Yekaterinburg, USFEU Publ., 2010. 137 p.
  7. Sivakov V.P., Stepanova E.N., Vurasko A.A., Stoyanov O.V. Cluster Diagnosis in a Comprehensive Assessment of the Serviceability of Technical Equipment. Vestnik Kazanskogo tekhnologicheskogo universiteta [Bulletin of the Technological University], 2015, vol. 18, no. 1, pp. 357–358.
  8. Sivakov V.P., Mikushina V.N., Vurasko A.V., Stoyanov O.V., Grebenshikov Y.M. Application of Trend Analysis for Diagnosing the Technical State of Equipment. Vestnik Kazanskogo tekhnologicheskogo universiteta [Bulletin of the Technological University], 2015, vol. 18, no. 2, pp. 390–392.
  9. Tordua G.A. Machines and Apparatus for Pulp and Paper Production. Moscow, Lesnaya promyshlennost’ Publ., 1986. 440 p.
  10. APPM to Revamp Pulp at Novodvinsk Mill. PPI Europe, 2014, vol. 29, no. 12, p. 11.
  11. Dumas: Customized Steam and Condensate System for Palm Wӧrth PM 6. Prof. Papermark, 2004, no. 1, pp. 67–68.
  12. Hazi A., Hazi G. Exergy Flows in the Paper Machine. Modelling and Optimization in the Machines Building Field, 2005, no. 11, vol. III, pp. 146–149.
  13. International Conference Voith Paper – Graphic Papers, September 4–6, 2002. Salzburg, 2002, pp. 23–24.
  14. Jewitt D.E. Apparatus and Associated Method for Drying a Wet Web of Paper. Patent US, no. 6425981, 2002.
  15. Mayer R., Begemann U. Anodrnung zur Herstellung oder/und Behandlung von Bahn- oder Blattmaterial [Device for the Production and/or Treatment of Strip or Sheet Material]. Patent DE, no. WO 2005/045130 A2, 2005.
  16. Metso Paper: Inbetriebnahme der weltgrӧbten Wellpappenrohpapiermaschine. Allgemeine Papier-Rundschau, 2003, pp. 16–21.
  17. Sautter G.M. The Drying and Fining Processes Future Innovation Solutions for Efficiency, Quality and Safety. Pulp and Paper Industry, 2017, vol. 2/3, pp. 30–35.
  18. Sekiya K. Pollution Prevention Method for Cylindrical Dryer Used in Paper Machine. Patent US, no. US 6,858,113 B1, 2005.
  19. Steam System and Dryer Services. Pulp and Paper Industry, 2010, vol. 52, no. 8, p. 11.
  20. Viljanmaa M. Method and Equipment for Producing Driving Power in Paper or Board Mill. Patent US, no. US 2005/0160618 A1, 2005.
  21. Wolf R., Mack T., Oechsle M., Mayer W. Verfahren und Anodrnung zum Trocknen einer Faserstoffbahn insbesondere Papier-, Karton- oder Tissuerbahn. Patent DE no. DE 19958875 A1, 2001.

Experimental and Theoretical Study of Heat Losses in Drying Cylinders

 

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