Numerical Study of the Effect of Tilt and Yaw Sofa Angles on Boiler Rear Pass Temperature Deviation and NOx Content on a Tangentially Fired Pulverized Coal Boiler at Negative Tilt Burner Angle

The 625 MW steam power plant’sPower plant tangentially fired pulverized coal boiler is facilitated with burner and SOFA angle adjustment to achieve combustion heat balance in variance of fuel input calorific value. This research aims to determine the deviation of rear pass boiler temperatureRear pass boiler temperature and NOx gas generated from the changes in the tilt burnerTilt burner parameter (0°, −15°, −30°) and the variation of tilt-yaw SOFATilt-yaw SOFA angle (−15°, −8°, 0°, +8°, +15°) using low-calorie coal (3900–4500 kcal/kg). The simulation experimentsExperiment of angle changes were done using a computational fluid dynamic software, and the numerical simulation data is processed using ANN training. The results show the lowest MSE value for the rear pass temperature deviation function, which is 0.0198, and the equation for the NOx content function is 0.000673. The lowest deviation temperature obtained from numerical simulation is 35.42 °C at the setting of 0° tilt burnerTilt burner angle and −15° tilt SOFA angle. The NOx generated at the setting of −15° tilt burner angle and −15° tilt SOFA angle is 122.71 mg/Nm³, which is 16.74% lower than the NOxNOx gas emission produced by variations in angles that resulted in the lowest temperature deviation.