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Performance Assessment of the Drying Section of Machines for the Production of Tissue Paper Grades

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D.A. Prokhorov, A.S. Smolin

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UDС

676.056.5 + 676.252

DOI:

10.37482/0536-1036-2020-2-159-168

Abstract

The paper presents the method for assessment the performance of high-speed Yankee hoods in the production of tissue paper grades and the results of its use in working machine. The following parameters are found applying this method: paper web dryness, air pressure in the wet and dry ends of high-speed convective dryers and temperature of the air spilled out of the hoods. The methodology is based on the measurement of these characteristics during the operation of working equipment with further adjustment of the separate system units. Thermal imaging was carried out during the experiment. It has been found that blowing hot air on the front side of the hood and sucking in the cold air on the drive side leads to uneven moisture profile (measured on the paper machine roll) across the paper web width, a decrease in energy efficiency and the machine capacity. Performance indicator may be, for instance, the spilled air temperature, which on the studied machine is significantly different from the standard value and is 175 °C. The rationality of regular monitoring of air characteristics when changing processing modes is proved. The relevance of the cascade system is substantiated, where not only a direct cascade from the dry end to the wet end is possible, but also there is an opportunity to adjust the humidity of exhaust air by addition/reduction of part of it to/from the dry end. The direct effect of adjusting the humidity of exhaust air in the drying section on reduction of energy costs, as well as the effect of makeup air on the amount of infiltration and the air balance of the system are confirmed. A set of measures implemented within the framework of this methodology makes it possible to achieve energy saving in existing industries. The prospective saving potential of gas is 62 m3/h or 17 % of the current consumption and actual electricity consumption is 6.8 kWh or 4 % for the studied machine.

Authors

D.A. Prokhorov, Postgraduate Student; ORCID: https://orcid.org/0000-0001-5206-4119
A.S. Smolin, Doctor of Engineering, Prof.

Affiliation

Saint-Petersburg State University of Industrial Technologies and Design, ul. Ivana Chernykh, 4, Saint Petersburg, 198095, Russian Federation; e-mail: daniel.prokhorov@gmail.comgturp.tbik@mail.ru

Keywords

paper machine, tissue paper grades, tissue, drying section, Yankee hood, energy consumption, cross-direction moisture profile, machine productivity

For citation

Prokhorov D.A., Smolin A.S. Performance Assessment of the Drying Section of Machines for the Production of Tissue Paper Grades. Lesnoy Zhurnal [Russian Forestry Journal], 2020, no. 2, pp. 159–168. DOI: 10.37482/0536-1036-2020-2-159-168

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Received on July 15, 2019


Performance Assessment of the Drying Section of Machines for the Production of Tissue Paper Grades

 

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