The pneumatic transport of cracking catalyst in vertical risers

✍ Scribed by S. Stemerding

• Publisher: Elsevier Science
• Year: 1962
• Tongue: English
• Weight: 704 KB
• Volume: 17
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(62)80053-0

✦ Synopsis

The paper discusses pressure-drop data obtained in the pneumatic transport of fme cracking catalyst in vertical risers of 241~ diameter and of several lengths, with air and steam as tran~poti gases at various temperatures and pressures. An analysis, based on a theoretical relation derived by HINZE, shows that the main contributions to the pressure drop come from: (1) The static hold-up of solids in the riser. (2) The friction of the solids at the wall. (3) The acceleration of the solids. From this theoretical relation and the experimental data an empirical relationship is established which contains all characteristic variables. The pressure drop across the riser proves not to depend on the viscosity or on the density of the transport gas within the ranges studied (viscosity: l&37 x 10-B Nsec/m2; density: 0.33-5.0 kg/m3).