The effects of in-furnace coal blending 25% MRC and 75% LRC on combustion characteristics in pulverized coal boiler

Coal blending method is a technology of mixing two types of coal with different calorific value to optimize combustion. This study aims to analyze the effect of coal leveling variations to determine the optimal combustion conditions with a composition of 75% LRC and 25% MRC coal. Temperature Distribution, Contour-vector velocity, & Contour of Exhaust Mass Fraction (NOx, CO2, & O2) are results parameters that will be compared to find the optimal blending configuration. The results of the coal leveling configuration study show that the placement of MRC coal at elevation C shows optimal results at the distribution temperature, either distribution analysis in the furnace area or detailed analysis in the FEGT area. Furthermore, the configuration of MRC at level c is simulated to see its effect on the mass flow rate of primary air combustion, it was found that the configuration of primary air combustion mass flow rate within 68 t/h had optimal results compared to 62 t/h & 77 t/h. So that the use of coal with a minimum MRC can be carried out continuously by setting the mass flow rate of primary air combustion in 68 t/h.