Numerical investigation of heat and mass transfer processes in the combustion chamber of industrial power plant boiler. Part 1, Flow field, temperature distribution, chemical energy distribution

摘要

In the present paper, the furnace chamber of the BKZ-160 boiler ofAlmaty TPP-3 (Kazakhstan) has been calculated.The thermal characteristics of the process were studied in the form of the distribution of temperature fields andchemical energy, and the aerodynamics of the combustion chamber was also calculated. The type of fuel, itselementary and fractional composition, exerts the greatest influence on the course of heat-mass exchange processesand aerodynamics. The computational experiment was carried out with two models of particle size distribution: apolydisperse fuel flame (the particle diameter varies from 10 to 120 μm) and monodisperse fuel flame (particle sizeidentical and equal to dp = 60 μm). Based on the results of the computational experiments, the main regularities inthe distribution of heat fluxes in the combustion chamber volume and flow aerodynamicswere obtained. It is shownthat the greatest thermal load falls on the central region of the walls of the combustion chamber and the location ofthe burner devices, which is typical for both mono- and polydisperse fuel flames. The temperature data obtainedas a result of the computational experiment showed better convergence with the empirical data obtained directlyat TPP-3. Aerodynamics of the flow for the two selected models of particle size distribution has insignificantdifferences, but how they affect other characteristics of the process is one of the following tasks in view of theauthors. It should be noted that the calculation of the polydisperse fuel flame takes much more calculation time.