Transport and reaction in evolving, disordered composites-I. Gasification of porous solids

✍ Scribed by N. Shah; J.M. Ottino

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 971 KB
• Volume: 42
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(87)80210-5

✦ Synopsis

The problem of modelling the gasification of porous solids is complicated by the interactions between the transport-reaction mechanisms and the dynamics of the complex, evolving morphology of the solid. These mechanisms can be decoupled by assuming that the morphology is perfectly disordered and remains as such throughout the gasification process. Whereas this assumption is undoubtedly simplistic it allows the study of the problem in the range between diffusion control and kineticcontrol. Throughout this work, the role of the morphology is highlighted whereas other aspects, such as chemistry, have been considerably simplified. The main goals are to study the interactions between the transport, reaction and morphological evolution processes and to emphasize the role of the erosion process in the acceleration of the gasification rate. iNTRODUCTlON Many media of interest in chemical engineering can be broadly classified as composites.

For our purposes, a