Fluidised-bed combustion of a charge of coke with a wide distribution of particle sizes

✍ Scribed by O.D.S. Mota; A.M.F.R. Pinto; J.B.L.M. Campos

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 600 KB
• Volume: 49
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(94)85082-8

✦ Synopsis

Abstraet~We describe a study of the combustion of charges of coke with a wide range of particle sizes in fluid&d beds of sand. The coke particles ranged in size from 2.0 to 6.5 mm and experiments were performed with small and large charges of particles. In the latter case the experiments were performed only in conditions where the mass transfer resistance of O2 from the bubbles to the particulate phase had a negligible contribution to the overall 0, mass transfer resistance. The beds of sand were made of closely sized particles with average diameters of 0.23, 0.46 and 0.65 mm. The beds were operated at atmospheric pressure and at a temperature of 1223 K. A simple theory was developed, based on the findings ofPinto and Guedes de Carvalha (1990, Trans. Instn them. Engrs 68A, 503-509) and G&es de Carvalho Ed al. (1991, Trans. Instn them. Engrs 69A, 63-70), to predict the mass transfer resistance of 0, from the particulate phase to the burning particles and the bum-out time. This theory shows excellent agreement with the experimental data.