THE EFFECT OF OPERATING CONDITIONS AND FURNACE GEOMETRY ON THE ATTAINMENT OF FLOW CONDITIONS OF THE FLOATING RICE HUSK PARTICLE

• Main Author: Novebriantika
• Format: Theses
• Language: Indonesia
• Subjects: Teknik kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/60609
• Institution: Institut Teknologi Bandung

furnace. The combustion chamber used needs to be designed in such a way as to obtain the desired particle flow conditions. This study aims to see the effect of geometry and operating conditions of the combustion chamber on the achievement of rice husk particle flow conditions in the combustion chamber. Particle flow conditions are simulated using the Computational Fluid Dynamic (CFD) tool and the device used is the ANSYS Fluent student version. Variations are made on the shape of the combustion chamber (box and cylinder), the size of the combustion chamber, and the number of secondary inlets. The operating conditions were carried out by varying the amount of excess air (EA) and particle diameter. The fluid dynamics modeling in this study uses the mass conservation equation and turbulent momentum which is also known as the Reynolds Average Navier-Stokes (RANS) equation. Meanwhile, the model used to solve the system of equations is the RSM turbulent model. The simulation results show that the magnitude velocity increases with the increase in the amount of excess air, but will decrease with the increasing size of the combustion chamber and the increase in the number of secondary air inlets. Increasing the number of secondary air inlets and the larger the size of the combustion chamber will reduce the intensity of the turbulence that occurs, while increasing the amount of excess air will increase the intensity of the turbulence. The residence time of the particles will decrease with the increase in the amount of excess air, and the size of the combustion chamber, but will increase with the increase in the number of secondary air inlets and the size of the particle diameter. Cylindrical geometry has higher magnitude velocity, turbulent intensity, residence time, and static pressure when compared to box geometry. The cylinder geometry combustion chamber is superior to the box geometry combustion chamber, because it has better turbulence intensity, residence time, and flow structure.