THERMOGRAVIMETRIC ANALYSIS OF THE COMBUSTION CHARACTERISTICS OF OIL SHALE SEMI-COKE/BIOMASS BLENDS

Oil Shale ◽  
2011 ◽  
Vol 28 (2) ◽  
pp. 284 ◽  
Author(s):  
W QING ◽  
X HAO ◽  
L HONGPENG ◽  
J CHUNXIA ◽  
B JINGRU
Keyword(s):  
Thermogravimetric Analysis ◽  
Oil Shale ◽  
Combustion Characteristics

Co-combustion Characteristics and Kinetics Behavior of Torrefied Sugarcane Bagasse and Lignite

2021 ◽  
Vol 10 (4) ◽  
pp. 737-746
Author(s):  
Ukrit Samaksaman ◽  
Kanit Manatura
Keyword(s):  
Thermogravimetric Analysis ◽  
Physicochemical Properties ◽  
Burning Rate ◽  
Sugarcane Bagasse ◽  
Combustion Characteristics ◽  
Firing Process ◽  
Combustion System ◽  
Heating Value ◽  
Kinetics Of ◽  
Derivative Thermogravimetry

The co-combustion characteristics and kinetics of torrefied sugarcane bagasse (TB), lignite (L), and their blended samples were experimentally investigated using thermogravimetric analysis (TGA) and derivative thermogravimetry (DTG)based on the Coats-Redfern method for kinetic estimation.Their physicochemical properties were also investigated.Raw bagasse was thermally treated in a laboratory-scale torrefactor at 275 °C with a torrefaction time of 60 min under an inert nitrogen environment.Then, the torrefied bagasse was blended with Thai lignite as a co-fuel at ratios of 50:50 (TB50L50), 70;30(TB70L30), and 90:10 (TB90L10), respectively. Torrefaction improved the fuel properties and heating value of the raw bagasse as well as reducing the O/C and H/C ratios.In addition, the blending of torrefied bagasse with lignite improved the combustion behavior.The TGA and DTG results indicated that the ignition and burnout temperatures stepped downwards with different increasing ratios of torrefied bagasse.The co-combustion behavior at the maximum burning rate showed that the burnout temperatures of TB50L50, TB70L30, and TB90L10 were 532, 529, and 528 °C, respectively, indicating a slight decrease with an increasing torrefied bagasse blending ratio.These results were sufficient to provide comprehensive guidelines in terms of the design and operation of the combustion system for adding torrefied bagasse into the co-firing process.

Thermogravimetric Analysis of Combustion Characteristics of Palm Oil and Rapeseed Oil Biodiesel

2014 ◽  
Vol 14 (1) ◽  
pp. 9-15 ◽  
Author(s):  
Yongbin Lai ◽  
Bo Wang ◽  
Xiu Chen ◽  
Yinnan Yuan ◽  
Lei Zhong ◽  
...  
Keyword(s):  
Thermogravimetric Analysis ◽  
Palm Oil ◽  
Rapeseed Oil ◽  
Combustion Characteristics

scholarly journals Pyrolysis Kinetic Parameters of Omari Oil Shale Using Thermogravimetric Analysis

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4060
Author(s):  
Ziad Abu El-Rub ◽  
Joanna Kujawa ◽  
Samer Al-Gharabli
Keyword(s):  
Activation Energy ◽  
Thermogravimetric Analysis ◽  
Kinetic Parameters ◽  
Oil Shale ◽  
Arrhenius Plot ◽  
Frequency Factor ◽  
Coefficient Of Determination ◽  
Assay Method ◽  
Temperature Integral ◽  
Integral Approximation

Oil shale is one of the alternative energies and fuel solutions in Jordan because of the scarcity of conventional sources, such as petroleum, coal, and gas. Oil from oil shale reservoirs can be produced commercially by pyrolysis technology. To optimize the process, mechanisms and rates of reactions need to be investigated. Omari oil shale formation in Jordan was selected as a case study, for which no kinetic models are available in the literature. Oil shale was analyzed using the Fischer assay method, proximate analysis (moisture, volatile, and ash), gross calorific value, elemental analysis (CHNS), and X-ray fluorescence (XRF) measurements. Non-isothermal thermogravimetric analysis was applied to study the kinetic parameters (activation energy and frequency factor) at four selected heating rates (5, 10, 15, and 20 °C/min). When oil shale was heated from room temperature to 1100 °C, the weight loss profile exhibited three different zones: drying (devolatilization), pyrolysis, and mineral decomposition. For each zone, the kinetic parameters were calculated using three selected methods: integral, temperature integral approximation, and direct Arrhenius plot. Furthermore, the activation energy in the pyrolysis zone was 112–116 kJ/mol, while the frequency factor was 2.0 × 107 − 1.5 × 109 min−1. Moreover, the heating rate has a directly proportional relationship with the rate constant at each zone. The three different methods gave comparable results for the kinetic parameters with a higher coefficient of determination (R2) for the integral and temperature integral approximation compared with the direct Arrhenius plot. The determined kinetic parameters for Omari formation can be employed in developing pyrolysis reactor models.

Synergistic Investigation for Co-Combustion of Biochars and Lignite—Thermogravimetric Analysis Approach

2018 ◽  
Vol 11 (1) ◽  
Author(s):  
H. Haykiri-Acma ◽  
S. Yaman
Keyword(s):  
Thermal Analysis ◽  
Thermogravimetric Analysis ◽  
Hybrid Poplar ◽  
Calorific Value ◽  
High Reactivity ◽  
Combustion Characteristics ◽  
Heterogeneous Reactions ◽  
Analysis Approach ◽  
Fundamental Change ◽  
Burning Behavior

Abstract This paper addresses whether synergistic interaction or additive behavior govern the co-combustion characteristics of lignite and biochars produced from hybrid poplar (HP), ash tree (AT), and rhododendron (RH). The biochars were blended with lignite and the burning behavior was investigated by thermal analysis. Upon carbonization, fundamental change occurred in the burning mechanisms of biomass from homogeneous to heterogeneous reactions. Blending the lignite with biochars led to improvement in the calorific value and reductions in the ash yield. Carbonization limited the high reactivity of biomass, and the reactivities of biochars became closer to the lignite's reactivity, consequently they burned in accord without segregation.

scholarly journals KINETIC INVESTIGATION ON PARTIALLY OXIDIZED HUADIAN OIL SHALE BY THERMOGRAVIMETRIC ANALYSIS

Oil Shale ◽  
2014 ◽  
Vol 31 (4) ◽  
pp. 377 ◽  
Author(s):  
F BAI ◽  
Y SUN ◽  
Y LIU ◽  
B LIU ◽  
M GUO ◽  
...  
Keyword(s):  
Thermogravimetric Analysis ◽  
Oil Shale ◽  
Kinetic Investigation

Combustion Characteristics of Coal and Waste Fuels by Thermogravimetric Analysis

2016 ◽  
Vol 33 (5) ◽  
pp. 461-466 ◽  
Author(s):  
Jeong Min Park ◽  
◽  
Sangin Keel ◽  
Jinhan Yun ◽  
Ji Hye Yun ◽  
...  
Keyword(s):  
Thermogravimetric Analysis ◽  
Combustion Characteristics
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