scholarly journals Investigation of co-pyrolysis characteristics of high-ash Indian coal and rice husk

2021 ◽  
Vol 1146 (1) ◽  
pp. 012014
Author(s):  
Mohd. Moiz ◽  
Saurabh Gupta ◽  
Santanu De
Keyword(s):  
Rice Husk ◽  
Indian Coal ◽  
Pyrolysis Characteristics

scholarly journals Study of the Combustion , Pyrolysis Characteristics and Synergistic Effect of Co-hydrocharsation Products of Oil Shale and Rice HuskStudy of the Combustion , Pyrolysis Characteristics and Synergistic Effect of Co-hydrocharsation Products of Oil Shale and Rice Husk

2021 ◽  
Author(s):  
Yaoxin LIU ◽  
Enyu Wang ◽  
Ze KAN
Keyword(s):  
Synergistic Effect ◽  
Functional Groups ◽  
Rice Husk ◽  
Oil Shale ◽  
Thermal Transformation ◽  
Combustion Process ◽  
Hydrothermal Temperature ◽  
Fossil Energy ◽  
Pyrolysis Characteristics ◽  
Pyrolysis Processes

Abstract Under the pressure of environmental problems and fossil energy shortage, countries all over the world are looking for fuel to replace fossil energy. Oil shale and rice husk are potential fuels, but they both have some problems, such as high ash content and low calorific value .In the present study,oil shale and rice husk were used as feedstock for the high quality fuel through hydrothermal approach,it provides a new way for the resource utilization of oil shale and rice.Thermogravimetric method was used to analyze the functional groups change and thermal transformation characteristics of mixed hydrochars prepared for oil shale(OS) and rice husk(RH) at different hydrothermal temperatures(150,200 and 250℃), including combustion and pyrolysis processes, and analyze the synergistic effects. Results showed that the co-hydrocharsization pretreatment had a significant effect on the thermal transformation behavior of oil shale and rice husk.On the one hand, the mixture of hydrocar has higher volatile content than its calculated value.On the other hand,a synergistic effect(promoting combustion and pyrolysis behavior) was found in both combustion and pyrolysis processes, and this effect was the most obvious when the hydrothermal temperature was around 200℃,and the characteristic peak of functional groups vibration was strong.Since the synergistic effect of pyrolysis process is lower than that of combustion process, co-hydrocharsation products are considered to be more suitable for combustion.These findings have positive significance of energy generation and utilization of organic waste by the combination of co-hydrocharsization modification and subsequent thermochemical process.

Pyrolysis Characteristics of Rice Husk Using TG-DTG Analysis

2013 ◽  
Vol 291-294 ◽  
pp. 351-354
Author(s):  
Qing Wang ◽  
Chun Xia Jia ◽  
Hong Peng Liu
Keyword(s):  
Activation Energy ◽  
Rice Husk ◽  
Frequency Factor ◽  
Weight Loss Curve ◽  
Heating Rates ◽  
Pyrolysis Characteristics ◽  
Thermogravimetric Analyzer ◽  
Purge Gas ◽  
Arrhenius Plot Method ◽  
Pyrolysis Kinetic

The rice husk from China has been non-isothermally pyrolysed on thermogravimetric analyzer(TGA). The analyses were performed at different heating rates (20, 40, 60, 80, 100°C/min) up to 900°C with nitrogen as purge gas. The weight loss curve showed that the main pyrolysis of rice husk took place in the range of 200~500°C. On the basis of experiment data, a pyrolysis kinetic model was proposed. The kinetic parameters of activation energy(E) and frequency factor(A) were obtained by the Direct Arrhenius Plot Method. There was no clear relationship between activation energy and heating rate.

Pyrolysis characteristics and kinetic analysis of rice husk

2019 ◽  
Vol 139 (1) ◽  
pp. 577-587 ◽  
Author(s):  
Chunxia Jia ◽  
Jiajia Chen ◽  
Jiawen Liang ◽  
Shaobo Song ◽  
Kexin Liu ◽  
...  
Keyword(s):  
Kinetic Analysis ◽  
Rice Husk ◽  
Pyrolysis Characteristics

Co-gasification of Indian rice husk and Indian coal with high-ash in bubbling fluidized bed gasification reactor

2018 ◽  
Vol 137 ◽  
pp. 608-615 ◽  
Author(s):  
M. Bharath ◽  
Vasudevan Raghavan ◽  
B.V.S.S.S. Prasad ◽  
S.R. Chakravarthy
Keyword(s):  
Fluidized Bed ◽  
Rice Husk ◽  
Indian Coal ◽  
Bubbling Fluidized Bed

Study of Co-pyrolysis Characteristics of Lignite and Rice Husk in a TGA and a Fixed-Bed Reactor

2013 ◽  
Vol 11 (1) ◽  
pp. 479-488 ◽  
Author(s):  
Wenju Wang ◽  
Xiaobing Zhang ◽  
Yunhua Li
Keyword(s):  
Synergistic Effect ◽  
Rice Husk ◽  
Fixed Bed ◽  
Kinetic Studies ◽  
Order Reaction ◽  
Fixed Bed Reactor ◽  
First Order Reaction ◽  
First Order ◽  
Pyrolysis Characteristics ◽  
Exponential Factors

Abstract Co-pyrolysis characteristics of lignite and rice husk blend were determined in TGA and a fixed-bed reactor. From TGA results, the weight loss rate of lignite and rice husk blend increases at 250–400°C. In a fixed bed at programmed temperature condition, the synergistic effect to produce more volatiles is appeared at 500–700°C, and the maximum synergistic effect exhibits with a rice husk blending ratio of 0.8. The gas yield of co-pyrolysis of lignite and rice husk blend was higher than that of the sum of lignite and rice husk individually. The kinetic studies were performed according to Coats–Redfern method for first-order reaction. It was found that the pyrolysis process of lignite and rice husk could be described by one first-order reaction and two consecutive first-order reactions, respectively. However, for lignite and rice blends, this process can be described by three consecutive first-order reactions. The estimated kinetic parameters, viz., activation energies and pre-exponential factors for lignite, rice husk and their blends, were found to be in the range of 63.5–477.8 kJ/mol and 1.4 × 103–6.5 × 1047 min−1, respectively.

scholarly journals Elucidating The Thermal Decomposition Mechanism and Pyrolysis Characteristics of Biorefinery-Derived Humins From Sugarcane Bagasse And Rice Husk

2021 ◽  
Author(s):  
Julio César de Jesus Gariboti ◽  
Marina Gontijo Souza Macedo ◽  
Vinícius Matheus Silva Macedo ◽  
Yesid Javier Rueda-Ordóñez ◽  
Emília Savioli Lopes ◽  
...  
Keyword(s):  
Activation Energy ◽  
Sugarcane Bagasse ◽  
Rice Husk ◽  
Isoconversional Method ◽  
Reaction Model ◽  
Thermochemical Conversion ◽  
Thermal Decomposition Mechanism ◽  
Pyrolysis Kinetics ◽  
Pyrolysis Mechanism ◽  
Pyrolysis Characteristics

Abstract Biomass-derived humins produced in the biorefining of biomass represent an attractive feedstock for thermochemical processes and other carbon-derived platform chemicals. However, in most works, humins are merely a by-product that is not further analyzed. This work presents the purification and characterization of humins derived from sugarcane bagasse and rice husks (H-SCB and H-RH respectively), followed by the kinetic and thermodynamic analysis of its pyrolysis. Pyrolysis was examined via thermogravimetric analysis (TGA), and a global reaction model was adopted to address pyrolysis kinetics. To understand the pyrolysis process of humins and boost the quality of fit between the kinetic model and thermoanalytical data, the analyses were based on the Vyazovkin isoconversional method. The activation energy of H-SCB increased from 166.09 to 329.76 kJ mol-1. In contrast, the activation energy of H-RH decreased from 163.31 to 84.99 kJ mol-1. According to the results of the generalized master plot approach, the governing reaction mechanism shifted among order-based models, nucleation, and diffusion-controlled particle mechanisms. Derived thermodynamic properties showed that the heat absorbed helps the humins to achieve a more ordered state close to a conversion of 0.50. As far as we know, these findings are the first reported data on the forecast kinetic curves and pyrolysis mechanism of biorefinery-derived humins from sugarcane bagasse and rice husk, and these results will enable process design for the thermochemical conversion of these emerging materials to produce energy and other products.

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