Heat Transfer Analysis of Laboratory Scale Reactor of Fast Pyrolysis Fluidised Bed

• Main Author: Tan, Yong Sin
• Format: Thesis
• Language: English
• Published: 2015
• Subjects: TJ Mechanical engineering and machinery
• Online Access: http://eprints.intimal.edu.my/102/1/BMEGI%20-%2043.pdf; http://eprints.intimal.edu.my/102/
• Institution: INTI International University

This report presents the results of heat transfer analysis of a fluidised bed by using different type of fluidised bed sands. Academic version of FLUENT 15.0 was used in performing the simulations. Eulerian-Eulerian two-fluid granular model is used as the multiphase flow model to solve this simulation. 2-D axisymmetric fluidised bed (2.5cm X 50cm), glass beads and stainless steel beads of 1 mm and 0.5mm in diameter are used in the simulations. Thermal conductivity of the material is calculated using the standard approach used by Kuipers et al. (1992). Gidaspow model is used for the drag equation and Gunn’s model (1978) is used in the calculation fir interphase heal transfer coefficient. In order to analyse the heat transfer of different material and different sizes heat transfer is evaluated by comparing the IITC measured in (he simulation. It is found out that stainless steel beads is better in heat transfer compared to glass beads as it has higher heat transfer coefficient, interphase HTC and wall to bed HTC. Nevertheless, the temperature rise of the glass beads is higher than stainless steel beads after 30 seconds. It is also found out that temperature rise for small diameter granular solids is much higher than that of the larger diameter granular solids.