EFFECT OF TURNING THE FLOW OF SECONDARY AIR IN THE BOILER'S BURNER SYSTEM ON THE THERMAL AND GAS DYNAMICS OF THE BOILER FIRING SPACE AND THE PROCESS OF FORMATION OF NITROGEN OXIDES IN THE ACTIVE COMBUSTION ZONE

The aim of the work is computer simulation of the formation of nitrogen oxides in the combustion zone of the boiler of the CCI 312 with different twists of secondary air in the boiler burners. The organization of the vortex flow allows to reduce the generation of nitrogen oxides due to the formation of a return flow, which ballasts the combustion zone by oxidation products. The limitation of this technique is to reduce the combustion temperature, which can lead to underburning. The objective of the study is to determine the formation of nitrogen oxides based on computer simulation of the thermogas dynamics of the firing space of the boiler Chamber of Commerce and Industry 312 DTEK Ladyzhinskaya TPP when burning gas coal using spinning blades in the secondary air channels of the burners. The following variants of the secondary air flow in the burners were investigated: 1) without twisting the flow, both in the outer annular channels and in the internal channels of the burners (the variant is taken as the baseline for comparison); 2) 8 blades in the outer annular channels in their absence in the internal channels; 3) 24 blades in the outer annular channels in their absence in the internal channels; 4) 8 blades each, both in the outer annular canals and in the internal canals; 5) 24 blades, both in the outer annular canals, and in the internal canals. With an increase in the number of blades, the pressure drop increased, which was necessary to overcome their resistance. The greatest effectiveness of the use of turbulent blades is observed in the range of their total number from 8 to 16. The expression for the relative change of the amount of nitrogen oxide emissions and the fan power required to overcome the resistance of turbine blades was obtained.