Characterization and analysis of thermal response of rice husk for gasification applications

Abstract

Present study involves characterisation and thermal analysis of rice husk as a potential source for gasification. Both the thermogravimetric (TG) analysis and differential scanning calorimetry were used to study the influence of heating rate on the degradation of rice husk. Experiments were carried out at three different heating rates of 10, 30, and 80 K min−1. The kinetic parameters, viz. pre-exponential factor, activation energy, and order of reaction were evaluated for both first and second reaction zones, which are categorized based on the degradation of cellulose, hemicelluloses, and lignin content present in the biomass. The degradation of mass with temperature obtained from TG curve was validated numerically. The thermal response of rice husk undergoing decomposition has also been modelled by using a one dimensional (1-D) transient thermal model with an nth order approximation for the rate of decomposition. Kinetic parameters, heat of decomposition, and thermal properties are taken as input to the model. The model was validated by measuring the transient temperature profiles during decomposition using Heisler chart at heat transfer coefficient of 20 W/m2 K. The data for specific heat and thermal conductivity of the biomass were taken from the literature and the values of heat of decomposition and kinetic parameters were taken from the experiments. Model results were compared well with the result obtained by using Heisler chart.

The Thickness Effect of Exothermic Sleeve Made From Rice Husk on Its Performance as A Riser in Steel Casting

“…Sleeve with a thickness of 25 mm has a mass of 450 grams, and a sleeve thick 15 has a mass of 235 grams. The heat produced by each sleeve is determined by its mass and can be calculated as follows note : Q = Heat (Joule) m = Mass of sleeve (kg) c = Specific heat of rice husk (Joule/Kg.K) = 1690,71 J/Kg [18] ∆T = Temperature difference ( o C) Based on the above calculations, the amount of heat produced by a sleeve of 25 mm thick is 159,77 J while a sleeve of 15 mm thick produces only 23,84 J. The temperature of GS30Mn5 steel in the sleeved riser with a sleeve thickness of 25 has a higher increase compared to the sleeved riser with a sleeve thickness of 15 mm.…”

An experimental study on eco-friendly and cost-effective natural materials for productivity enhancement of single slope solar still

“…The materials chosen for this research was molasses powder, rice husk, sawdust, bamboo straw, banana leaf stem and rice straw. These materials were chosen because of their premium properties (Jagannadha Rao et al 2008;Kalita et al 2013;Bello RS and Onilude MA 2017) (mentioned in Table 1), low cost and their availability. The molasses powder, rice husk and sawdust enhance the evaporation rate due to improved wet surface area, which these powders had more absorptivity and more spread over the basin water.…”

An Experimental Study on Eco-Friendly and Cost-Effective Natural Materials for Productivity Enhancemento Single Slope Solar Still

“…The materials chosen for this research was molasses powder, rice husk, sawdust, bamboo straw, banana leaf stem and rice straw. These materials were chosen because of their premium properties (Jagannadha Rao et al 2008;Kalita et al 2013;Bello RS and Onilude MA 2017) (mentioned in Table 1), low cost and their availability. The molasses powder, rice husk and sawdust enhance the evaporation rate due to improved wet surface area, which these powders had more absorptivity and more spread over the basin water.…”