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Here we present the results of 3D computer modeling of combustion coal-dust in the combustion chamber of the boiler BKZ-75. Calculations performed by the numerical model for the conditions adopted by the organization of the actual process on Shahtynskaya Thermal Power Plant. Carried out in this paper, the research allowed identifying the main patterns of distribution of heat exchange performance in the entire volume of the combustion chamber of the researched boiler and at the exit from it. The authors carried out numerical experiments of 3D computer modeling for describing complex processes of heat and mass transfer. Proposed the numerical methods of solving a system of equations describing heat and mass transfer, and a program package has been developed for solving combustion problems. New computer modeling results of turbulent heat-and mass transfer process received during burning coal-dust fuel in the combustion chamber of the BKZ-75 boiler. The developed technologies will make it possible to exclude inefficient and costly methods of conducting research in the field of fuel-burning energy industry. Numerical modeling including thermodynamic, kinetic and three-dimensional computer modeling of burning low-grade Kazakhstan coal will optimize the process of ignition, combustion and stabilization of coal combustion, and also develop technical solutions for the modernization of existing power plants and for the design of new power boilers.

In this paper deals with development and application the numerical model for solution of processes at combustion chamber of the industrial boiler. The combustion chamber of the BKZ-75 boiler installed at Shakhtinskaya Thermal Power Plant (Karaganda, Kazakhstan) was chosen as the object of the research. As a result of computational experiments obtained distribution of concentrations of harmful substances: CO2, CO, NO throughout the volume of the combustion chamber and on an output from it. In addition, the authors received a distribution of oxygen depending on the height of the combustion chamber. The minimum and maximum values of the investigated characteristics are established. The dynamics of the change in the characteristics of the heat and mass exchange process in the volume of the researched combustion chamber is shown. Obtained results give quantitative information on the amount of combustion products including harmful substances. The numerical model becomes a tool for investigation and design of combustion chambers with high-efficiency and reliable operation of boiler at thermal power plants. The results of this research has high practical importance, they allow studying heat exchange processes occurring in combustion in real geometry areas (combustion chambers of power plants).