Thermal decomposition, kinetics and combustion parameters determination for two different sizes of rice husk using TGA

Q2 Engineering

Engineering in Agriculture, Environment and Food Pub Date : 2019-10-01 DOI:10.1016/j.eaef.2019.08.002

Saad El-Sayed

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引用次数: 21

Abstract

The present study concerns the thermal pyrolysis kinetics of sieved rice husk that was classified into two sizes (38–200 μm) and (200–1000 μm) by using Thermo-Gravimetric analysis (TGA) at different heating rate (HR) values under N₂. The thermal pyrolysis analysis was presented and kinetic parameters as activation energy (E), frequency factor (A), and order of reaction (n) were determined by using three different kinetic models. The effect of heating rate (HR) and particle sizes on the chemical kinetic parameters were presented and discussed. Direct method gave lower values of E and A compared to the integral method. Results showed that as particle size increases, values of the activation energy (E) and frequency factor (A) nearly increase. The combustion characteristic parameters such as ignition, burnout and peak temperatures and their corresponding times were determined. It found that larger sizes (200–1000 μm) have a relatively lower ignition temperature, higher activation energy and noticeably lower ignition times as compared to the smaller sizes (38–200 μm).

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用热重分析仪测定两种不同尺寸稻壳的热分解、动力学和燃烧参数

采用热重分析(TGA)方法，研究了在N2条件下不同加热速率(HR)下筛分的稻壳(38 ~ 200 μm)和(200 ~ 1000 μm)的热热解动力学。采用三种不同的动力学模型进行热热解分析，确定了活化能(E)、频率因子(A)和反应级数(n)等动力学参数。讨论了加热速率和粒径对化学动力学参数的影响。与积分法相比，直接法得到的E和A值较低。结果表明:随着粒径的增大，活化能(E)和频率因子(A)的值几乎增大;测定了点火、燃尽、峰值温度等燃烧特性参数及其对应的时间。结果表明，与较小尺寸(38 ~ 200 μm)相比，较大尺寸(200 ~ 1000 μm)的点火温度较低，活化能较高，点火次数明显减少。

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来源期刊

Engineering in Agriculture, Environment and Food Engineering-Industrial and Manufacturing Engineering

CiteScore

1.00

自引率

0.00%

发文量

期刊介绍： Engineering in Agriculture, Environment and Food (EAEF) is devoted to the advancement and dissemination of scientific and technical knowledge concerning agricultural machinery, tillage, terramechanics, precision farming, agricultural instrumentation, sensors, bio-robotics, systems automation, processing of agricultural products and foods, quality evaluation and food safety, waste treatment and management, environmental control, energy utilization agricultural systems engineering, bio-informatics, computer simulation, computational mechanics, farm work systems and mechanized cropping. It is an international English E-journal published and distributed by the Asian Agricultural and Biological Engineering Association (AABEA). Authors should submit the manuscript file written by MS Word through a web site. The manuscript must be approved by the author''s organization prior to submission if required. Contact the societies which you belong to, if you have any question on manuscript submission or on the Journal EAEF.