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Experimental analysis of convective drying of paper and board

Journal Article · · Drying Technology
 [1];  [2];  [2];  [2]
  1. University of Minnesota, Twin Cities, St. Paul, MN (United States); University of Minnesota
  2. University of Minnesota, Twin Cities, St. Paul, MN (United States)
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Conventional multi-cylinder drying of paper and board involves a mixture of conductive drying from steam-heated dryer cylinders and convective drying by the flow of heated air over the surface of the paper web in the pockets. Pocket ventilation is a critical component in assisting heat and mass transfer during the drying process but is the primary contributor towards removing evaporated water from the web. Air temperature, velocity, and humidity are critical parameters involved in the convective drying process. This paper covers an experimental study involving the design and development of a small lab-scale setup for convective drying of various grades of paper and board, monitoring multiple parameters like paper temperature, moisture content, air humidity, temperature, and velocity measured in situ as the drying proceeds with continuous and accurate sampling capabilities for all parameters in the sample and the system. Instantaneous drying rates, heat, and mass transfer coefficients were also deduced for every time step till the paper completely dried. Furthermore, the coefficients obtained were also reported in the form of dimensionless correlations, and the results were compared against traditional correlations used in the modelling of paper drying. Furthermore, this data will be useful in process development, modelling, design, and the paper drying process simulation.
Research Organization:
University of Minnesota, Twin Cities, St. Paul, MN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
EE0009395
OSTI ID:
2544231
Journal Information:
Drying Technology, Journal Name: Drying Technology Journal Issue: 5 Vol. 42; ISSN 0737-3937
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English

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Rapid and nondestructive evaluation of hygroscopic behavior changes of thermally modified softwood and hardwood samples using near-infrared hyperspectral imaging (NIR-HSI) journal August 2020

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Related Subjects

42 ENGINEERING
convection
drying
heat transfer
mass transfer
paper
process design