NUMERICAL SIMULATION OF CO-COMBUSTION OF BIOMASS AND PULVERIZED COAL IN A PRECALCINER

As high energy consumption and pollution increase in the cement industry, utilizing biomass as a substitute fuel has been deemed a promising energy-saving and emission reduction measure. Currently, research on the mixed burning of coal and biomass has mostly been done at the experimental level, providing limited guidance for actual production. Therefore, this paper investigates the mixed burning of coal fines and corn straw in a TTF-type precalciner by combining real production data and CFD numerical simulation methods. The influences of different corn straw blending ratios on the performance of precalciner are explored. The results show that, compared with non-corn straw, as the blending ratio of corn straw increases, the high temperature zone inside the precalciner significantly shrinks. The maximum temperature of the furnace decreases to 1370 K, the export raw materials' decomposition rate decreases to 83.92%, and the concentration of NO drops to 464 ppm when 40% corn straw is blended. After comprehensive consideration, it is found more suitable to mix 30% corn straw. Compared to experimental studies, this study has more practical guidance significance for cement enterprises seeking to utilize biomass alternative fuels.