Improving flame guniting has made it necessary to design the nozzles of the tuyeres through which the air is supplied to the guniting mass in the hollow of the metallurgical assembly. : Figure 1 shows the diagram of the burner of the tuyeres for flame guniting.The guniting mass is a polydispersed system consisting of particles of coke and magnesite having different densities and thermophysical characteristics. From a sieve analysis, the curve characterizing the grain composition of the Gunite mass has been drawn and the particles have been separated into three fractions of equal mass for each component [1].Since the gas in the nozzles moves with acceleration, the velocities of the particles of the solid phase will lag behind that of the gas; but the lag will not be identical for different particles. Therefore, with high concentrations of the Gunite mass in the transporting flow, we must take into account the collisions between particles of different fractions of both components.In studying the motion of particles of a Gunite mass in the transporting stream of air, we assume that the flow of the gas suspension is adiabatic and uniform. We assume that the interphase heat exchange is affected only by convection and that the gas is an ideal gas. The particles of the solid phase are assumed to be spherically symmetrical and the collisions between particles of various fractions of the components are calculated using the normal method [2].In order to describe the motion of a gas suspension on the basis of the above assumptions, we shall use the following system of equations: the motion of particles of the i-th fractions:the equation for the conservation of the mass of particles the i-th fraction:the equation of the heat exchange between particles of the i-th fraction and the gas:the equation of the conservation of mass of the gas :the equation of gas motion: du dp ~" OiRiOu dx dx i= 1 mi the equation of conservation of energy of the gas flow:All-Union Institute of Refractories. Western Siberia Metallurgical Plant.

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