Modelling of the Voelund Cigar Burner by means of the computer model STRAW

摘要

The Voelund Cigar Burner gas been modelled by means of the Computer Model STRAW which calculates the steady and non-steady behaviour of surface combusting straw bales. The mathematical formulation is one-dimensional and the flow of gas through the straw bales is described by means of Darcy's law for flow through a porous medium. The model treats important phenomena such as: Evaporation, condensation and diffusion of water; Pyrolysis of straw; Combustion of gas; Combustion of straw char; Thermal radiation; heat conduction in the straw; Straw-gas heat transfer; The straw bale properties such as porosity, permeability and water content may vary with time and the location in the bale. The influence of various events upon the straw bale combustion has been examined. The options considered are: Straw bale feed stop; Continuous straw bale feed; Change of straw bale feed velocity; Change of primary air flow rate; Change of straw bale water content. (au) 2 tabs., 61 ills., 13 refs.