Rokhman B. Aerodynamics, heat transfer and combustion in gas-dispersion ascending flows

The main objective of this work is development of methods of mathematical modeling of transport processes in the boilers that are more correct, informative, complete and adequate in comparison with the known models. For this purpose we developed a new method of calculation based on building of the chain of high order correlations equations, with regard for turbulent and pseudo turbulent transfer mechanisms of admixture in anisotropic field of chaotic particles energy. We have proposed a new closure model of equations for the second, third and fourth moments based on the hypothesis of equality to zero of fourth and fifth order cumulants and derived analytical expressions for the double correlations induced by interparticle collisions.Using moment equations in the Euler approximation we constructed a number of models of aerodynamics, heat exchange and combustion of upward polydisperse flow with regard for interphase and interparticle interaction, rotation of particles, their polydispersity, radiative and conductive-convective heat transfer. The engineering methods of calculation of the workflow in fluidized bed (FB) and circulating fluidized bed (CFB) furnaces are created. The way of thermal contact pyrolysis of coal in the part of annular zone and its implementation method are proposed by which the effect of clusters destruction is found near the wall.The results of calculations of flow parameters are in good agreement with experiment. With the help of a number of constructed models we have found the optimal coal burning mode in FB with minimal mechanical underburning and the reasons of downcomer risers clogging in the furnace of the CFB of Starobeshevska thermal power plant and proposed an effective way to eliminate this danger. Key words: burning, gas, generation, dissipation, interparticle collisions, moments, rotation, pseudoturbulence, pyrolysis, furnace, turbulence.