INTENSIFICATION OF THE PROCESS OF FLAME COMBUSTION OF A PULVERIZED COAL FUEL

Consideration is given to a method of mechanoactivation intensifi cation of the fl ame combustion of a pulverized coal fuel through the formation of a stressed state for the microstructure of its particles; the method is based on the use of the regularities of their external (diffusion) and internal (relaxation) kinetics. A study has been made of mechanoactivation nonequilibrium processes that occur in fuel particles during the induced relaxation of their stressed state with a resumed mobility of the microstructure of the particles and intensify diffusion-controlled chemical reactions in them under the assumption that the time of these reactions is much shorter than the times of mechanical action on a particle and of stress relaxation in it. The infl uence of the diffusion and relaxation factors on the burnup time of a fuel particle and on the fl ame distance has been analyzed. Ranges of variation in the parameters of fl ame combustion have been singled out in which the fl ame distance is determined by the mechanisms of combustion of the
fuel and of mixing of combustion products.
   
Author:  V. I. Popov
Keywords:  transfer processes, combustion, mechanoactivation, relaxation, stressed state
Page:  1344