Improving Particle-Burning Efficiency of Pulverized Coal in New Inclined Jet Burners

This paper shows an investigation of pulverized coal in new inclined jet burners for improving particle-burning efficiency through parameter adjustment. The research focuses on the interaction between two oblique jet methane (CH4)/air premixed flame burners and a coal particle jet feeder on an impinging burner. Various parameters such as CH4/air ratios, gas fuel flow rates, deflection angles, and coal dust feed speeds are systematically examined. The findings of the study reveal the establishment of distinct flow field structures, characterized by collision and recirculation zones, upon the interaction of jets. Momentum transfer in the upstream airflow creates a preheating zone, fostering fuel-air mixing. Within these recirculation zones, coal particles undergo pyrolysis facilitated by temperature gradients, resulting in increased volatile output that promotes downstream combustion. Additionally, coal particles traversing recirculation zones with higher vorticity and elevated temperature regions tend to undergo early fragmentation and combustion of volatile components upon exiting these zones. This study underscores the intricate interplay of parameters in optimizing coal combustion efficiency and highlights avenues for further research and practical application. Observations indicate enhanced burner performance with increased CH4/air ratios and central flow speeds. The study identifies a correlation between the deflection angle and particle reduction rate, which increases from 63.5% to 64.7% with an increase in the deflection angle. The reduction rate ranges from 59.7% to 67.8% with a transition from fuel-rich to fuel-lean conditions. As velocity increases from 0.6 to 1.2 m/s, the particle reduction rate escalates from 57.5% to 74.5%.