In 2016 and 2017, AO Machine Building Factory of Podolsk jointly with OOO ZiO-COTES realised the projects for the retrofit of boilers PK-38 Nos.3A, 4B at the Nazarovo GRES power plant. A range of implemented technical solutions [1] allowed reach stable continuous operation of boiler PK-38 at the Nazarovo GRES at loads as high as 270 t/h and significantly reduced nitrogen oxide emissions. Development of the burners system and combustion modes, as well as estimation of nitrogen oxides emissions has been performed using three-dimensional computational fluid dynamics modelling.
A prospective laboratory-scale burner device that employs a concept of liquid fuel spraying in the high-speed superheated steam jet is considered. The presented work is devoted to numerical study of aerothermochemical processes occurring in this novel-design burner during the combustion of diesel fuel sprayed with axial jet of water steam. The mathematical model is based on Euler-Lagrange approach for two-phase turbulent reacting flow description applied in 2D axisymmetric steady-state formulation. The vaporized diesel fuel combustion is described via EDC model with chemical kinetics mechanism for n-heptane (30 species, 66 reactions). The two-step soot model is also used, as well as NOx prediction at post-processing stage. The fields of velocity, temperature, heat fluxes, gas species and disperse phase concentrations, including soot and NOx, have been obtained from numerical simulation for a typical operational mode with diesel supply rate of 1.2 kg/hour and water steam flowrate of 0.8 kg/hour. Analysis of these flowfield data has allowed to reveal the two-layer coaxial structure of reacting flow (consisting of relatively cold near-axis jet layer and the coaxial layer formed by the hot recirculation zone) inside the burner.
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