Simulation and Experimental Study of Water Soot Blower for Pulverized-Coal Boiler Based on Discrete Phase Model

Abstract

A pulverized-coal boiler is a type of boiler that is commonly seen in power plants. During an operation, a portion of the coal is converted to ash. The consequence is a cause of slagging on the furnace wall and a considerable loss in heat transfer performance. In coal-fired power plants, slagging is one of the most common causes of maintenance issues. This problem can be resolved by using a water soot blower cleaning system. It shoots a high-pressure jet of water through a hole in the side of the furnace’s wall to clean the opposite wall surfaces. This study presents a Computational Fluid Dynamics (CFD) investigation of the water soot blower trajectory with a flow field in full-scale boiler. Multiphase-flow simulation is utilized. The turbulence model couple and Discrete Phase Model are used to analyze flow field in boiler and water soot blower trajectory, respectively. The aim is to accurately determine an injection angle degree for the water soot blower. The CFD results are compared with the experiment of water soot blower shooting in Cold Air Velocity Test (CAVT) conditions. The results of the study show that the simulation results agree with the experimental data. Moreover, the velocity profile of numerical study shows that the effect of flow field in boiler has little effect on the water soot blower trajectory.