ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Modelling of Nonlinear Behaviour during Combustion of Single Coal Char Particle

Ľ. Jelemenský, J. Markoš, R. Žajdlík, and B. Remiarová

Department of Chemical and Biochemical Engineering, Faculty of Chemical Technology, Slovak University of Technology, SK-812 37 Bratislava

E-mail: jelemen@cvt.stuba.sk

Received: 19 May 2000

Abstract: Experimental and theoretical investigation of combustion of a single coal char particle is presented. As a model of coal char particle combustion the shell progressive mechanism was considered. The porous structure of an original, devolatilized and partially combusted particle was analyzed. Due to the bimodal character of the porous structure, the pore size distribution was determined by a sorption method and mercury porosimetry. Combustion experiments were carried out in an equipment where the TGA method was applied for process monitoring. This equipment allowed to study the behaviour of the coal char particle during the process of drying, degassing, and combustion. During the combustion process, the particle consisted of two regions { the noncombusted core and the ash layer. The time dependences of the particle mass, temperature in the particle and gas phase, and composition of the combustion products were measured. The obtained experimental results confirmed that the shell progressive mechanism can be applied for the mathematical description of combustion of single coal char particle.

Full paper in Portable Document Format: 546ba473.pdf

Chemical Papers 54 (6b) 473–481 (2000)