Comparison of bituminous coal apparent activation energy in different heating rates and oxygen concentrations based on thermo gravimetric analysis

2017 ◽  
Vol 130 (2) ◽  
pp. 1181-1189 ◽  
Author(s):  
Jiancun Gao ◽  
Mingran Chang ◽  
Jing Shen
Keyword(s):  
Activation Energy ◽  
Apparent Activation Energy ◽  
Bituminous Coal ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Heating Rates ◽  
Thermo Gravimetric ◽  
Oxygen Concentrations

scholarly journals CO2 Gasification Kinetics of Shenhua Bituminous Coal by Isothermal Thermo-Gravimetric Analysis

2020 ◽  
Author(s):  
Jinzhi Zhang ◽  
Zhiqi Wang ◽  
Ruidong Zhao ◽  
Jinhu Wu
Keyword(s):  
Activation Energy ◽  
Bituminous Coal ◽  
Thermo Gravimetric Analysis ◽  
Correlation Coefficients ◽  
Mathematical Expression ◽  
Frequency Factor ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Kinetics Of ◽  
Compensation Relationship

Abstract This research performed the gasification kinetics of three Shenhua coal under CO2 atmosphere using isothermal thermogravimetry. Results showed that isothermal gasification curves for three different coal samples revealed different gasification behaviour. Among the eleven kinetic models, A2 was the most suitable one to describe the gasification kinetics of three coal samples, because it can reproduce the experimental data very well with reasonable correlation coefficients. The activation energy for sample A, B and C were 95.9, 79.1, and 69.4 kJ mol-1, respectively. The activation energy decreased with the increase of the particle size. The compensation relationship was observed between activation energy and frequency factor, and the mathematical expression was lnA=0.1041 E+0.54028 with the correlation coefficients of 0.999.

Activation Energy of Decomposition of Y2bacuo5 Compound in Wet Co2 at Elevated Temperatures

1989 ◽  
Vol 169 ◽  
Author(s):  
John J. Simmins ◽  
Michael J. Hanagan ◽  
Gary S. Fischman ◽  
Robert L. Snyder
Keyword(s):  
Activation Energy ◽  
Elevated Temperatures ◽  
Barium Carbonate ◽  
Thermo Gravimetric Analysis ◽  
Time Derivative ◽  
Simultaneous Thermal Analysis ◽  
Analysis Data ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric

AbstractDecomposition of the Y2BaCuO5 in C02 was studied using simultaneous thermal analysis (STA) and X-ray diffraction (XRD). The time derivative to the thermo-gravimetric analysis data (DTG) was used to calculate the activation energy. The activation energy of decomposition by CO2 into barium carbonate, copper oxide and yttrium oxide was found to be <

Thermo-Gravimetric Analysis (TGA) of Combustion and Gasification of Styrene-Butadiene Copolymer (SBR)

2005 ◽  
Author(s):  
Marco J. Castaldi ◽  
Eilhann Kwon
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Combustion Efficiency ◽  
Unexpected Result ◽  
Gravimetric Analysis ◽  
Heating Rates ◽  
Thermo Gravimetric ◽  
Pure Nitrogen ◽  
Rubber Waste ◽  
Styrene Butadiene ◽  
Sample Carrier

An investigation has been initiated to determine the effects of various atmospheres (6.9% O2/N2, 21% O2/N2 (air), 30% O2/N2, 3% H2/N2 and pure N2) on the efficiency of gasifying or combusting rubber waste to produce synthesis gas or generate steam or power. This paper reports on the findings from a series of TGA experiments at various heating rates on styrene-butadiene copolymer (SBR), which is the main starting component for tire manufacturing. The results indicate that oxygen enhanced atmospheres have a significant effect on increasing combustion efficiency at the tested heating rates. A hydrogen-spiked atmosphere, surprisingly, did not have a significant effect on the gasification rates of SBR at any heating rate; in addition, this atmosphere resulted in a carbon residual that remained in the sample carrier, something that was not observed in the other atmospheres, including pure nitrogen. An unexpected result of the N2-O2 tests was the development of a plateau in the mass-loss versus temperature curves, at temperatures near 500°C.

Thermo-Gravimetric Analysis and Kinetic Study of Biomass Pyrolysis

2013 ◽  
Vol 800 ◽  
pp. 509-516 ◽  
Author(s):  
Yong Sheng Fan ◽  
Xiao Hua Li ◽  
Yi Xi Cai ◽  
Wei Dong Zhao ◽  
Hai Yun Yin
Keyword(s):  
Activation Energy ◽  
Heating Rate ◽  
Thermo Gravimetric Analysis ◽  
Evaluation Methodology ◽  
Gravimetric Analysis ◽  
Pyrolysis Process ◽  
Biomass Pyrolysis ◽  
Thermo Gravimetric ◽  
Exponential Factor ◽  
Kinetics Of

In order to realize the optimization of pyrolysis process, the pyrolysis characteristics and kinetics of common agriculture and forestry biomass were studied. Four kinds of biomass were chosen as experiment materials for thermo-gravimetric experiment. The Characteristics of biomass pyrolysis was studied by defining a new evaluation methodology. The method of Coats-Redfern was used to analyze pyrolysis kinetics of biomass pyrolysis process. The results of research show that the pyrolysis process of biomass can be divided into three stages, including drying and preheating, fast pyrolysis and slow decomposition of residue. The activation energy of pyrolysis reaction of biomass during the low temperature stage is higher than that of the high temperature stage. The values of the activation energy and pre-exponential factor are increasing with the increase of heating rate. The pyrolysis of biomass in the main pyrolysis zone can be effectively described by using the kinetic model n=2. The heating rate of 15K/min and temperature of 500°C can improve the reaction rate, and it helps to reduce energy consumption of the reaction.

Thermogravimetric Analysis and Characterisation of Yard Waste as a Feedstock to Gasification Process

2013 ◽  
Author(s):  
Anjireddy Bhavanam ◽  
R. C. Sastry
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Thermal Conversion ◽  
Inert Atmosphere ◽  
Thermochemical Conversion ◽  
Gravimetric Analysis ◽  
Heating Rates ◽  
Thermo Gravimetric ◽  
Yard Waste ◽  
Gasification Process ◽  
Institute Of Technology

Gasification has great potential to make use of the biomass and wastes as a source for energy among various thermochemical conversion processes. The aim of this work is to study the suitability of yard waste for energy conversion using gasification process by Thermo gravimetric analysis. Yard waste (consisting of leaves, twigs and grass clippings) is collected from the National Institute of Technology Warangal. It is then dried and ground to a particle size of less than 250μm for thermo gravimetric study. Before going to thermo gravimetric analysis; the sample is analyzed to measure the main properties that affect thermal conversion. Moisture content present in the sample is determined by the oven drying method. Proximate is done according to standard ASTM test methods and ultimate analysis is conducted using elemental analyzer. Finally thermo gravimetric analyses is performed at various heating rates of 10, 30, and 50°Cmin−1 in nitrogen (inert) and air (oxidizing) atmospheres. The weight losses of yard waste in inert atmosphere occur in three stages and in air it occurs in four stages.

scholarly journals Synthesis, Spectral and Thermo-Gravimetric Analysis of Novel Macromolecular Organo-Copper Surfactants

2018 ◽  
Vol 5 (1) ◽  
pp. 145-157 ◽  
Author(s):  
Anju Joram ◽  
Rashmi Sharma ◽  
Arun K. Sharma
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Free Energy ◽  
Thermogravimetric Analysis ◽  
Edible Oils ◽  
Thermo Gravimetric Analysis ◽  
Spectral Studies ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Structural Insight

Background: The present paper highlights: Synthesis of copper surfactants derived from edible oils i.e. Groundnut & Sesame and non-edible oils i.e. Neem & Karanj. Methods: Spectral studies (IR, NMR) have been carried out to understand the structural insight of the surfactants synthesized. Results and Conclusion: Thermogravimetric analysis of copper surfactants derived from Groundnut, Sesame, Neem & Karanj has been done to confirm the thermal decomposition/stability. Kinetic parameter i.e. activation energy and thermodynamic parameters i.e. Gibbs free energy, entropy and enthalpy were calculated by five different well-known equations namely Freeman Carroll, Coats - Redfern, Horowitz – Metzger, Broido, and Piloyan –Novikova.

Pyrolysis Kinetics of Oil Shale and its Kerogen

2015 ◽  
Vol 733 ◽  
pp. 236-240 ◽  
Author(s):  
Wei Wang ◽  
Shu Yuan Li ◽  
Ting Tan ◽  
Yue Ma
Keyword(s):  
Oil Shale ◽  
Regression Coefficient ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Pyrolysis Kinetics ◽  
Heating Rates ◽  
Nitrogen Flux ◽  
Thermo Gravimetric ◽  
Gravimetric Data ◽  
Kinetics Of

The pyrolysis kinetics of Chinese oil shale and its kerogen was investigated using thermo gravimetric analysis (TGA) in this paper. Experiments were performed at four different heating rates of 10, 15, 20 and 25°C/min from ambient temperature to 560 °C at nitrogen flux with 60ml/min. The results demonstrated that the thermal decomposition of oil shale and its kerogen involved three degradation steps. Different thermo gravimetric data were analyzed by Friedman procedure. The values of apparent activation energy E of oil shale ranged from 160kJ/ mol to 240kJ/mol, but these of kerogen were in the range of 150kJ/mol to 240kJ/mol. It was found that the plot of lnA versus E became a linear line with a regression coefficient of 0.99.

Kinetics and exergy analysis of pyro-gas from residual tyres

2021 ◽  
Vol 23 (08) ◽  
pp. 795-811
Author(s):  
P. Rajkumar ◽  
◽  
Dr. S. Murugavelh ◽  
Keyword(s):  
Activation Energy ◽  
Thermo Gravimetric Analysis ◽  
Fixed Bed ◽  
Fine Powder ◽  
Calorific Value ◽  
Maximum Energy ◽  
Total Carbon ◽  
Gravimetric Analysis ◽  
Heating Rates ◽  
Model Free

About1.5 billion tyres are manufactured every year and enormous quantity of the tyres end up in trash. Waste rubber tyres possess calorific value around 39- 42 MJkg-1which makes it an attractive choice for pyrolysis process. The aim of the present work is to convert residual tyres into energy reach pyro-gas. A single column fixed bed batch pyrolyzer was designed pyrolysis of residual tyres. The residual tyres were ground into fine powder. The characterization of powdered residual tyres was performed with elemental analyser to determine the total carbon, hydrogen, nitrogen and sulphur. Thermo Gravimetric Analysis of the residual tyres was conducted at different heating rates viz., 5 °C min-1, 10 °C min-1, 15 °C min-1 to elucidate the thermal degradation profile. The thermal cracking of a residual tyres was conducted at temperature range of 450 °C to 550 °C with increment of 50 °C. Pyro-gas was measured individually for each trail and the exergy was determined using thermodynamic laws. Four different model-free methods were employed to estimate the kinetic parameter such as activation energy and order of the reaction. The average activation energy from Friedman model was evaluated to be 127.35 kJ mol-1. A maximum of 52.11% of Pyro-oil was reported at 550 °C. The maximum energy and exergy were 5.49 MJ kg-1 and 4.92 MJ kg-1 respectively.

scholarly journals Physio-Chemical and Thermo-Gravimetric Analysis of Prosopis Juliflora and Fibre-Reinforced Plastic for Gasification Process

2019 ◽  
Vol 8 (2) ◽  
pp. 4232-4238
Keyword(s):  
Gas Flow ◽  
Thermo Gravimetric Analysis ◽  
Chemical Conversion ◽  
Prosopis Juliflora ◽  
Nitrogen Atmosphere ◽  
Gravimetric Analysis ◽  
Waste Biomass ◽  
Heating Rates ◽  
Thermo Gravimetric ◽  
Reinforced Plastic

Significance of developing energy from waste biomass has grown extremely high in recent decades. Prosopis Juliflora (PJ - Organic) is a waste plant which was grown in agricultural landfills and Fibre-reinforced plastic (FRP - Inorganic) is procured from composite industry waste are collected for this work, which is abundant in quantity. Gasification are the adequate method for harvesting energy efficiently from organic and inorganic biomass. The objective of this research was to conclude the proximate and ultimate analysis of Prosopis Juliflora and Fibre-reinforced plastic to study the potential for thermo-chemical conversion process. Thermo-gravimetric analysis were observed at heating rates of 20, 30 and 40 ºC/min in inert (nitrogen) atmosphere with gas flow protection rate of 40 ml/min was analyzed for PJ, FRP and PJ+FRP (50:50). Index Terms:

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