Effect of Diffusers Installation in Inlet Primary Air Coal Pulverizer on Airflow Characteristic and Wear Concentration using CFD Modeling

Abstract

This study investigates the effect of installing several diffuser models in the supercritical power plant pulverizer inlet ducting on airflow characteristics and wear concentration. The pulverizer internal check results show that one area of the wall was wearing abnormally or faster than usual. This condition affects the availability of the pulverizer. Previous research has produced a method to overcome this phenomenon, but the design model was still unsuitable for the actual operational condition. This study simulated air motion in a pulverizer with six different diffuser models. The two variations in the number of blades were two and three blades, combined with three angle variations, which were 30 • , 45 • , and 50 • . Viscous k-omega SST was used in this CFD modeling to simulate airflow from the primary inlet to the area above the throat ring. The results show the contours of the velocity of the air and the velocity vector on the pulverizer. From all the variations in this study, the 45 • angle model with three blades and the 50 • angle model with three blades can help overcome the concentration of wear on the pulverizer wall.

Numerical Study of Heat Sink Models Mosquito Hotend on FDM 3D Printer to Determine Heat Transfer Characteristics

“…SIMPLE is used as Pressure-Velocity coupling. Also, secondorder discretization is used as a solution method [7,8]. In this study, to determine the effect of variations in inlet airflow velocity on the temperature profile of the heat sink, speed variations are 0, 0.25, 0.5, 0.75, and 1 m/s were carried out by running the geometry and meshing that had been formed and achieving grid independence in ANSYS software based on operating conditions and repeating them using the specified speed variations.…”