An experimental verification of numerical model on superheated steam drying of Belchatow lignite

7th European Thermal-Sciences Conference

Zakrzewski, M.^1 ; Sciazko, A.^1 ; Komatsu, Y.^2,3 ; Akiyama, T.^3 ; Hashimoto, A.^3 ; Kaneko, S.^3 ; Kimijima, S.^3,3 ; Szmyd, J.S.^1 ; Kobayashi, Y.^3

Department of Fundamental Research in Energy Engineering', Faculty of Energy and Fuels, AGH University of Science and Technology, 30 Mickiewicza Avenue, Krakow

30-059, Poland^1

Division of Regional Environment Systems, Graduate School of Engineering and Science, Shibaura Institute of Technology, 307 Fukasaku, Minuma-ku, Saitama

337-8570, Japan^2

Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku Tokyo

153-8505, Japan^3

关键词: Drying parameters;    Experimental investigations;    Experimental verification;    Heat and mass transfer;    High moisture contents;    Process parameters;    Superheated steam drying;    Temperature profiles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/745/3/032145/pdf
DOI  :  10.1088/1742-6596/745/3/032145

来源: IOP

【 摘 要 】

Due to low production costs, lignite is an important component of energy mixes of countries in its possession. However, high moisture content undermines its applicability as fuel for power generation. Drying in superheated steam is a prospective method of upgrading quality of lignite. The study aimed to validate the drying model of lignite from Belchatow mine in Poland. The experimental investigation on superheated steam drying of lignite was previously conducted. Spheres of 10 mm in diameter were exposed to the drying medium at the temperature range of 110-170oC. The drying behaviour was described in the form of moisture content, drying rate and temperature profile curves against time. With the application of basic coal properties (e.g. density, water percentage, specific heat) as well as the mechanisms of heat and mass transfer in subsequent stages of the process, the numerical model of drying was constructed. It was tentatively verified with reference to experimental results both in terms of drying parameters and temperature. The model illustrated drying behaviour in the entire range of conditions. Nevertheless, further development of numerical model is desirable regarding accuracy of the process parameters.