Solids circulation in a recirculating fluidized bed under sticky conditions

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-bidi-theme-font:minor-bidi;="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Experiments have been carried out on a semicircular transparent recirculating fluidized bed (RCFB) cold model to study the circulation under sticky conditions and to foresee the likely problems of the actual incinerator operations. It is observed that the circulation rate decreased with increase in stickiness. Auxiliary air supplied as downcomer aeration and/or side push below the draft tube bottom facilitated the solids movement and increased the circulation rates. Therefore, it is possible to operate the unit at higher stickiness with proper auxiliary air supply. The problems encountered during the operation of the RCFB under sticky conditions and the corresponding alterations in the design of an incinerator are also discussed.</span>