Comparison of Several Multi-Cylinder Paper Drying Simulation Models

Asensio, M. C.; Seyed-Yagoobi, J.; Lehtinen, Jukka; Karlsson, Markku; Timofeev, Oleg; Juppi, Kari

doi:10.1080/07373939508916992

Cited by 8 publications

(3 citation statements)

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“…At low paper temperature, evaporation rate is comparatively low. The constant rate drying period will continue as long as sufficient moisture exists within the web [29].…”

Section: Evaluation Of Evaporation Ratementioning

confidence: 99%

Steady-State Modeling of Multi-Cylinder Dryers in a Corrugating Paper Machine

2015

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In this study a steady state model was developed to describe the paper drying process and to analyze pocket dryer condition for a multi-cylinder fluting paper machine in Iran's Mazandaran Wood and Paper Industries. The machine has 35 cylinders grouped in three drying groups and the cylinders are heated from the inside by steam. The model is based on the mass and energy balance relationships written for fiber, air and water in drying section. In this research, the heat of sorption and its variations with paper temperature and humidity changes have been taken into account. Temperature and moisture variation of the paper web and cylinder surface temperature in machine direction were predicted by the proposed model. Also temperature and humidity of air in the drying pockets and hood exhaust were estimated by the proposed model. Moreover, the model can predict the evaporation rate and specific drying rate with sufficient accuracy in comparison with TAPPI standard.Finally, the main modeling parameters were compared with the available operating data and the effectiveness of the developed model was verified through validations.

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“…At low paper temperature, evaporation rate is comparatively low. The constant rate drying period will continue as long as sufficient moisture exists within the web [29].…”

Section: Evaluation Of Evaporation Ratementioning

confidence: 99%

Steady-State Modeling of Multi-Cylinder Dryers in a Corrugating Paper Machine

2015

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“…Although every published model has been verified with either laboratory experiments or industrial measurements, there has been no attempt to directly compare the individual models to each other or to a standard set of reference data. In this direction, Asensio et al (1995) compared three independently developed simulation models for the same machine operating conditions. They discussed different modeling assumptions and evaluated their effects on model accuracy for two different paper grades produced with two different machine geometries.…”

Section: Introductionmentioning

confidence: 99%

Thermocompressor Design for Efficient Energy Recovery of Paper Production Plant Dryers

1999

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The operational performance of a paper production plant can be significantly improved by appropriate process interventions. This paper deals with energy aspects of the most important section of such a plant, the paper drying section. A significant intenrention that would lower the operational cost of the drying process is proposed. it refers to the recompression of low pressure steam leaving the dryers by means of a thermocompressor that would utilize high pressure steam coming from the plant burners. The mathematical model of the thermocompressor is evaluated and its design procedure is formulated as a mathematical programming problem involving appropriate objective function and constraints.

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“…The commonest drying methods for paper, board and cellulose are cylinder (contact) drying and air float and air impingement drying. Usually, a low steam pressure is used in cylinder dryers, and the drying rates are not very high: 10–25 kg/m 2 /h [ 8 , 9 ]. Air impingement dryers can operate at high air temperature (300–500 °C) and air velocity (50–100 m/s).…”

Section: Introductionmentioning

confidence: 99%

Drying of Pigment-Cellulose Nanofibril Substrates

et al. 2014

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A new substrate containing cellulose nanofibrils and inorganic pigment particles has been developed for printed electronics applications. The studied composite structure contains 80% fillers and is mechanically stable and flexible. Before drying, the solids content can be as low as 20% due to the high water binding capacity of the cellulose nanofibrils. We have studied several drying methods and their effects on the substrate properties. The aim is to achieve a tight, smooth surface keeping the drying efficiency simultaneously at a high level. The methods studied include: (1) drying on a hot metal surface; (2) air impingement drying; and (3) hot pressing. Somewhat surprisingly, drying rates measured for the pigment-cellulose nanofibril substrates were quite similar to those for the reference board sheets. Very high dewatering rates were observed for the hot pressing at high moisture contents. The drying method had significant effects on the final substrate properties, especially on short-range surface smoothness. The best smoothness was obtained with a combination of impingement and contact drying. The mechanical properties of the sheets were also affected by the drying method and associated temperature.

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Comparison of Several Multi-Cylinder Paper Drying Simulation Models

Cited by 8 publications

References 0 publications

Steady-State Modeling of Multi-Cylinder Dryers in a Corrugating Paper Machine

Steady-State Modeling of Multi-Cylinder Dryers in a Corrugating Paper Machine

Thermocompressor Design for Efficient Energy Recovery of Paper Production Plant Dryers

Drying of Pigment-Cellulose Nanofibril Substrates

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