Devolatilization and ash comminution of two different sewage sludges under fluidized bed combustion conditions

• Published in: Experimental thermal and fluid science Vol. 34; no. 3; pp. 387 - 395
• Main Authors: Solimene, R., Urciuolo, M., Cammarota, A., Chirone, R., Salatino, P., Damonte, G., Donati, C., Puglisi, G.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier Inc 01-04-2010; Elsevier
• Subjects: ABRASION; Abrasion resistance; Applied sciences; ASHES; Attrition; Combustion; Combustion of heterogeneous mixtures. Incineration; Combustion. Flame; COMBUSTORS; COMMINUTION; Comminution phenomena; DEVOLATILIZATION; ELUTRIATION; Energy; ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; Energy. Thermal use of fuels; Exact sciences and technology; Fluidized beds; FLUIDIZED-BED COMBUSTION; FRAGMENTATION; Fragments; FUEL PARTICLES; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; MECHANICAL PROPERTIES; PARTICLES; Sewage; SEWAGE SLUDGE; SIZE; Theoretical studies. Data and constants. Metering; VOLATILE MATTER; Wet sewage sludge; Comminution phenomena; Devolatilization; Wet sewage sludge; Attrition; Fluidized beds; Fluidized bed combustion; Ash; Urban waste water; Waste water purification; Sewage sludge; Fragmentation
• ISSN: 0894-1777; 1879-2286
• DOI: 10.1016/j.expthermflusci.2009.10.033

Two different wet sewage sludges have been characterized under fluidized bed combustion conditions with reference to their devolatilization behavior and ash comminution with the aid of different and complementary experimental protocols. Analysis of the devolatilization process allowed to determine the size of fuel particle able to achieve effective lateral spreading of the volatile matter across the cross-section of medium-scale combustors. Primary fragmentation and primary ash particle characterization pointed out the formation of a significant amount of relatively large fragments. The mechanical properties of these fragments have been characterized by means of elutriation/abrasion tests using both quartz and sludge ash beds.