ТЕРМІЧНЕ РОЗКЛАДАННЯ ГРАНУЛЬОВАНОГО БІОПАЛИВА, ОТРИМАНОГО РІЗНИМИ СПОСОБАМИ АКТИВАЦІЇ

• Datum: 2020
• Hauptverfasser: Korinchevska, T.V., Mykhailyk, V.A.
• Format: Artikel
• Sprache: Ukrainian
• Veröffentlicht: Institute of Engineering Thermophysics of NAS of Ukraine 2020
• Online Zugang: https://ihe.nas.gov.ua/index.php/journal/article/view/419
• Назва журналу: Thermophysics and Thermal Power Engineering

The article considers the effect of the granulometric composition of pine wood sawdust and granulation modes on the thermal decomposition of biofuel. Mechanical activation and thermal activation of raw materials before pressing were used in the study. Thermal decomposition of granular fuel was carried out by the methods of thermogravimetry and differential thermal analysis. The temperature ranges of dehydration, thermal decomposition of organic and mineral substances, moisture and ash content of the fuel have been determined. The rates of thermal decomposition of organic substances in granular fuel were also determined. The thermal effects of thermal decomposition of the granule samples were compared. It is registered that the equilibrium moisture content of granules obtained after thermal activation of the raw material is lower than that for granules made by cold pressing. This is indirect evidence of their increased density. It has been determined that most of the heat of thermal decomposition of organic substances in granular fuels is released in the high-temperature period at a decomposition rate of 1,12 to 1,37 % dry matter per minute. It was revealed that the thermal effect of thermal decomposition of granules depends on the fractional composition of the ground raw materials. This may be due to the difference in the chemical composition of the fractions. The analysis of obtained results made it possible to determine that the mechanical activation of raw materials increases the average rate of granule decomposition, and thermal activation reduces it. That is, the mechanical activation of raw materials has a positive effect on the thermal decomposition process. Grinding wood sawdust to particles smaller than 0,2 mm can lead to partial destruction of complex macromolecular compounds (hemicellulose, cellulose and lignin). Thus, this leads to a decrease in the degree of intermolecular interaction and intensification of the decomposition process.