Numerical simulation оf coal combustion in the combustion chamber of a boiler unit

The paper presents the results of numerical investigation of physico-chemical processes in the furnace chamber of a steam boiler during flaring of polyfractional solid fuel. Given the presence of two-phase flow, the application of the QUICK quadratic upward interpolation scheme and the monotonicized counterflow MLU scheme for discretization of the spatial and temporal step of the convection-diffusion equation is considered. The simulation results in general reveal a good convergence of the numerical simulation results with in situ measurements when using the considered approximation schemes. At the same time, it is shown that, when using the QUICK scheme, deviations are observed in regions with large gradients, leading to the propagation of the calculation inaccuracy to subsequent domains. In both versions of the simulation, zones contributing to high-temperature corrosion were identified.