Temperature effect on adhesive capacity of wood and lignite in briquetting

Clean fuel production using renewable plant resources is one of the top-priority goals these days. Spotlight of this study is on the use of refuse wood as a binder in briquetting of massive mature lignite grades 2B and 3B. Cellulose, hemicelluloses and lignin, as three polymeric components of wood cells, possess viscoelasticity. Lignin, taken individually, is thermoplastic and can drop into highly elastic or visco-flow state under higher temperature. Aimed to define phase transitions of the polymeric components and to optimize the briquetting temperature, the viscoelastic properties of pine wood are studied using the method of the dynamic mechanical analysis as function of temperature variation. Alongside the change in the elastic and plastic properties of wood, the effect of water content on rheological properties of the test polymeric components is demonstrated. The structural tests of wooden briquettes and the mechanical analysis of coal-and-wood briquettes validate the obtained data on the viscoelastic properties of wood. In the temperature range of 80–100°С, the storage modulus decreases and the loss modulus increases. The mechanical tests reveal that in the same temperature range, the briquetted products experience the increasing compression strength and compaction and the decreasing elastic expansion.

Solov'ev T. M., Burenina O. N., Zarovnjaev B. N., Nikolaeva L. A. Temperature effect on adhesive capacity of wood and lignite in briquetting. MIAB. Mining Inf. Anal. Bull. 2021;(11):109-122. [In Russ]. DOI: 10.25018/0236_1493_2021_11_0_109.

T.M. Solov'ev¹, Engineer, e-mail: tuskulsolovev@yandex.ru,
O.N. Burenina¹, Cand. Sci. (Eng.), Head of Laboratory of Composite Construction Materials,
B.N. Zarovnjaev, Dr. Sci. (Eng.), Professor, M.K. Ammosov North-Eastern Federal University, 677000, Yakutsk, Republic of Sakha (Yakutia), Russia,
L.A. Nikolaeva¹, Cand. Sci. (Eng.), Senior Researcher,
¹ Institute of Oil and Gases Problems of Siberian Branch of Russian Academy of Sciences, 677007, Yakutsk, Republic of Sakha (Yakutia), Russia.

T.M. Solov'ev, e-mail: tuskulsolovev@yandex.ru.

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