Computing the Thermal Efficiency of Autoclaves during Steaming of Frozen Prisms for Veneer Production at Changing Operational Conditions-Reference-Cited by-同舟云学术

Computing the Thermal Efficiency of Autoclaves during Steaming of Frozen Prisms for Veneer Production at Changing Operational Conditions

Published:2023-03-09 Issue:3 Volume:11 Page:822
ISSN:2227-9717
Container-title:Processes
language:en
Short-container-title:Processes

Author:

Deliiski Nencho¹,Niemz Peter²³,Angelski Dimitar¹,Vitchev Pavlin¹,Tumbarkova Natalia¹

Affiliation:

1. Faculty of Forest Industry, University of Forestry, Kliment Ohridski Blvd., 10, 1797 Sofia, Bulgaria

2. Institute for Building Materials, ETH Zürich, CH 8093 Zürich, Switzerland

3. Department of Wood Science and Engineering, Luleå University of Technology, 931 77 Skellefteå, Sweden

Abstract

A methodology for the computation of the thermal energy efficiency of modes for the heat treatment of frozen wooden prisms in an autoclave with saturated water vapor at changing operational conditions has been proposed. The methodology includes computer simulations with two own-coupled unsteady models: one to calculate the 2D temperature distribution in the cross-section of prismatic wood materials during their heat treatment, and the second to determine the heat balance of industrial autoclaves for such wood treatment. Simulations were carried out in order to determine the duration, energy consumption, and thermal efficiency of different modes, caused by changed operational conditions, for the autoclave steaming of frozen beech prisms with industrial parameters in the absence and presence of dispatcher intervention. The influence of nine combinations between the time of dispatcher intervention and the degree of reduction of the constant maximum temperature from the 130 °C of the basic mode on the thermal efficiency of the autoclave was investigated. The results show that all studied dispatching interventions cause an increase in both the duration and the thermal efficiency of the modes. This efficiency in the modes at changing operational conditions has values between 68.7% and 74.6%, while the efficiency in the basic steaming mode is equal to 68.0%.

Publisher

MDPI AG

Subject

Process Chemistry and Technology,Chemical Engineering (miscellaneous),Bioengineering

Link

https://www.mdpi.com/2227-9717/11/3/822/pdf

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