Assessment of efficiency of drying grain materials using microwave heating
| Autor: | Irina Boshkova, Natalya Volgusheva, Alexandr Titlov, Sergij Titar, Leonid Boshkov |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
020209 energy Airflow 0211 other engineering and technologies Energy Engineering and Power Technology microwave heating 02 engineering and technology Kinetic energy Industrial and Manufacturing Engineering optimal method Management of Technology and Innovation 021105 building & construction lcsh:Technology (General) 0202 electrical engineering electronic engineering information engineering lcsh:Industry Electrical and Electronic Engineering Process engineering Water content Physics::Atmospheric and Oceanic Physics moisture content business.industry Applied Mathematics Mechanical Engineering temperature Energy consumption microwave-convective Computer Science Applications Control and Systems Engineering Scientific method lcsh:T1-995 lcsh:HD2321-4730.9 business drying rate Microwave Efficient energy use Dimensionless quantity |
| Zdroj: | Eastern-European Journal of Enterprise Technologies, Vol 1, Iss 8 (97), Pp 78-85 (2019) |
| ISSN: | 1729-4061 1729-3774 |
| Popis: | We present results of experimental work on studying the drying of a dense layer of grain using microwave heating. We investigated a series of techniques to supply heat to grain to assess energy efficiency of a microwave field. We studied the following ways of drying: a microwave method, a pulsating microwave method, a microwave-convective cyclic method with blow of a layer with heated air flow and air without preheating, simultaneous microwave-convective drying method. Studying the kinetics of drying in a microwave field showed that we can divide the process into heating periods (zero drying rate), constant (first drying rate) and falling (second drying rate). These periods are characteristic for drying of colloidal capillary-porous bodies at other methods of heat supply. We obtained empirical relationships for the drying rate and the average temperature of grain in the first period based on the generalization of experimental data on the study on drying of grain of buckwheat, barley, oats, and wheat. We presented kinetic dependences in a dimensionless form. They summarize data on the studied grains. The aim of comprehensive studies of various methods of heat supply during drying was determination of the optimal method and rational operational parameters, which ensure high intensity of the process and the required quality of the finished product with minimal energy consumption. All studies took place under identical conditions and for the same grain (oats) to ensure the accuracy of the comparison. We determined that the most preferable method is a simultaneous microwave-convective energy supply without air preheating, which minimizes specific energy consumption. Experimental studies on drying using a microwave field made possible to select the required process parameters: power, heating rate, mass, and form of loading. We plan to develop a technology for drying of grain using microwave energy based on the study data |
| Databáze: | OpenAIRE |
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