The Impact of Radiation in the Gas Combustion Model for Sugarcane Bagasse Grate Boiler

Abstract

-This work evaluates the impact of different radiation models on the results of Computational Fluid Dynamics (CFD) simulation of a sugarcane bagasse grate boiler. CFD has been applied extensively in the development of comprehensive models for biomass heterogeneous combustion. The model presented in this paper considers the turbulent flow represented by the standard k-ε model and the homogeneous combustion of the volatiles CH4 and CO by the Eddy Dissipation Model (EDM). Thermal profiles have been evaluated by comparing the results obtained without radiation with the results obtained with radiation represented by the P1 Approximation Method and by the Discrete Transfer Method (DTM). The discussion of the flue gas temperature and chemical composition profiles provides useful information regarding the characteristics of the internal flow and of the equipment operating conditions.

Numerical Simulation of the Process of Combustion of a Stoichiometric Hydrogen-Oxygen Mixture in a Steam Generator

“…The Euler-Euler multiphase model [34][35][36] was used to describe the motion of the twophase flow in the steam generator flow part. The principal model equations are given below: The Eddy Dissipation Model (EDM) [37,38] was used for describing the combustion process: , The description of the complex heat transfer between the gas, flame and walls in the paper accounts for radiant heat transfer by using the P1 model [29,33,38].…”

Vof Simulation of Single Rising Drops in Three Liquid-Liquid Extraction Systems Using CSF and CSS Interfacial Force Models

“…Due to the presence of contaminants and surface-active agents in the experimental studies, there are limitations on obtaining more precise results and, in some cases, requires very clean systems (Bäumler et al, 2011). Nowadays, numerical methods are widely used in different industrial applications (Ferreira et al, 2016;Oliveira et al, 2017, Pelissari et al, 2016, as well as in the new technologies of multiphase flow (Akbari et al, 2016;Goodarzi et al, 2014;Safaei et al, 2014Safaei et al, 2016. In the field of liquid-liquid extraction, numerical simulations are confidently used in order to attain a better hydrodynamic insight.…”