Isothermal combustion characteristics of anthracite and spent coffee grounds briquettes

• Published in: Journal of thermal analysis and calorimetry Vol. 136; no. 3; pp. 1447 - 1456
• Main Authors: Wei, Yuanhang, Chen, Meiqian, Li, Qinghai, Niu, Shibo, Li, Yang
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.05.2019; Springer; Springer Nature B.V
• Subjects: Analysis; Analytical Chemistry; Anthracite; Ashes; Blending; Briquets; Burning rate; Chemistry; Chemistry and Materials Science; Coffee; Combustion; Control engineering; Deformation; Furnaces; Inorganic Chemistry; Measurement Science and Instrumentation; Nitrogen dioxide; Physical Chemistry; Polymer Sciences; Thermogravimetric analysis; Anthracite; Isothermal combustion; Fixed bed; Spent coffee grounds; Macro-thermogravimetric analysis; Emissions
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-018-7790-x

The isothermal combustion characteristics of anthracite and spent coffee grounds briquettes in a bench-scale fixed-bed furnace were examined by using a macro-thermogravimetric analysis approach between 873 and 1173 K. The combustion performances in terms of the conversion rates, flame evolution, pollutant emissions, ash compositions and ash fusion temperatures of two anthracite/spent coffee grounds blend briquettes with blending ratios of 40% and 60% were also compared with those of their individuals. There was only an obvious peak in DTG profile for every sample at each temperature. At 973 K, the average burning rate of the spent coffee grounds was about 8 times higher than that of the anthracite. The average burning rate of 60% anthracite/40% spent coffee grounds blend at 1173 K increased by about 3 times in comparison with that at 873 K. NO 2 emissions for the four samples were much less than other gaseous emissions. The four ash fusion temperatures for the anthracite were higher than 1791 K. The deformation temperature, softening temperature, hemispherical temperature and flow temperature for the spent coffee grounds were 1526, 1626, 1687 and 1791 K. The ash fusion characteristics of the spent coffee grounds were improved by blending the anthracite.