Development and Thermal Modeling of a New Construction Biomass Dryer

Abstract

A new dryer construction has been developed for drying biomass basic materials for energy purposes (straw, sawdust, and other light granular materials). As a result of its simple design, the machine is perfectly suitable for reducing moisture by heat transfer. Compared to the machine types applied thus far, this new construction provides a better ratio of dryer floor space and drying distance and, as a result, a longer drying time. A differential equation system for convection drying was applied for the thermal modeling of the equipment; the mathematical model produced on the basis there of is suitable for examining the heat and mass transfer processes within the dryer. In the course of experimental measurements performed in an industrial size apparatus, the temperature and moisture content of the drying gas were recorded with the initial and final moisture content and surface temperature of the product. The measured values were compared to the results of calculations using the mathematical model.

Keywords:

• Biomass drying
• Heat and mass transfer
• Heat transfer coefficient

ACKNOWLEDGMENT

The project TÁMOP-4.2.1.B-11/2/KMR-2011-0001 “Research for critical infrastructure protection” was realized through the assistance of the European Union, with the cofinancing from the European Social Fund. Thanks to Takácsi Brikett Kft. for the use of the dryer.