Abstract
The work is devoted to numerical simulation of pulverized-coal combustion processes in the vortex furnace which is a prospective design of a boiler unit for thermal power plants. New modification of this design characterized by additional tangential-injection nozzle located at the bottom of combustion chamber has been studied. Numerical results for the case of Siberian brown coal combustion in this vortex furnace with dual-port loading are presented, including 3-D aerodynamic structure, the fields of temperatures, radiated heat fluxes, species and dispersed phase concentrations, and NOx emissions.
Highlights
IntroductionOne of prospective technologies to improve the heat transfer efficiency and ecological performance of boiler units for thermal power plants utilizing low-grade coals is the use of furnace devices with vertical jet pulverized-coal combustion
The work is devoted to numerical simulation of pulverized-coal combustion processes in the vortex furnace which is a prospective design of a boiler unit for thermal power plants
One of prospective technologies to improve the heat transfer efficiency and ecological performance of boiler units for thermal power plants utilizing low-grade coals is the use of furnace devices with vertical jet pulverized-coal combustion
Summary
One of prospective technologies to improve the heat transfer efficiency and ecological performance of boiler units for thermal power plants utilizing low-grade coals is the use of furnace devices with vertical jet pulverized-coal combustion. In the presented work a new modification of this design, proposed by authors [2] and characterized by additional tangential-injection nozzle located horizontally at the bottom of combustion chamber (bottom loading port), has been studied numerically with comprehensive combustion model for the full-scale furnace configuration. In this new vortex furnace design with dual-port loading, the stable swirl flow inside the combustion chamber is formed by two tangential jets of coal-air mixture released from the upper and the bottom nozzles. The purpose of the presented work is to investigate the features of two-phase turbulent reacting flow inside the furnace with aim to estimate and justify the new design and operating parameters for prospective boiler units with vortex furnace
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