Effect of biomass addition on the devolatilization kinetics, mechanisms and thermodynamics of a northeast Indian low rank sub-bituminous coal

Konwar, Kaberijyoti; Nath, Hari Prasad; Bhuyan, Nilutpal; Saikia, Binoy K.; Borah, Ramesh Chandra; Kalita, Alok Chandra; Saikia, Nabajyoti

doi:10.1016/j.fuel.2019.115926

Cited by 50 publications

(17 citation statements)

References 53 publications

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“…These results indicated that the biomass fuels had a much lower ignition temperature and were easier to achieve burnout due to the higher volatile content in biomass, resulting in better thermal reactivity. Besides, the higher carbon content and the lower oxygen content in coal also contributed to the higher decomposition temperature as the chemical bond energy for breaking the C-C bond was higher than that for the C-O and C-H bonds (Konwar et al, 2019). Therefore, the destruction of the macromolecular structure and chemical bonds delayed the burnout of coal, and the reaction occurred at a higher temperature.…”

Section: Fuel Properties Of a Single Samplementioning

confidence: 99%

“…It was noteworthy that the interaction between 60% biomass and 40% coal lagged behind other group blends; for CS, the interaction functioned as inhibition. This phenomenon may be driven by the fact that the devolatilization of chemical constituents from biomass blocked the pores of coal (Konwar et al, 2019), which could weaken heat-transfer efficiency and oxygen diffusion, therefore hindering the combustion of fixed carbon, inhibiting the devolatilization process and exerting resistance on gas diffusion (Chen et al, 2015). Besides, the generated fly ash would hinder the diffusion of the flame during 40% coal char combustion, thereby exhibiting a distinct flame retardant effect.…”

Section: Synergistic Effect Analysismentioning

confidence: 99%

“…Many researchers (Gil et al, 2010;Yanfen and Xiaoqian, 2010;Su et al, 2013;Lin et al, 2015;Lu and Chen, 2015;Jayaraman et al, 2017;Chen et al, 2018;Hu et al, 2019;Wang et al, 2019;Wang et al, 2020) have studied the cocombustion behaviors of different biomass and coal/biomass blends. A significant decrease in ignition and burnout temperature was observed by Wang et al (2019) and Konwar et al (2019). According to Chen et al (2018) and Liu et al (2015), the combustion indices, such as maximum mass loss, ignition performance, and the comprehensive combustion index, were evaluated.…”

Section: Introductionmentioning

confidence: 99%

“…Guo et al (2020) and Shi et al (2019) found the interaction between coal and biomass, including promoting synergy and inhibiting effects. The combustion kinetic parameters, including activation energy and the preexponential factor, using the Coats and Redfern method (Gil et al, 2010;Wang et al, 2012;Lin et al, 2015;Jayaraman et al, 2017;Chen et al, 2018) and the Flynn-Wall-Ozawa method (Xie and Ma, 2013;Liu et al, 2015;Konwar et al, 2019;Wang et al, 2019;Guo et al, 2020) were determined.…”

Section: Introductionmentioning

confidence: 99%

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Co-Combustion Characteristics of Typical Biomass and Coal Blends by Thermogravimetric Analysis

Yuan

Tan

et al. 2021

Front. Energy Res.

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In this study, the co-combustion characteristics of coal and biomass blends (20, 40, 60, 80, and 100 wt%) were investigated by thermogravimetric analysis. All the samples were operated under an oxidative atmosphere, with a heating rate of 20 C/min. The reaction stages, ignition and burnout temperature, maximum weight loss rate, and different combustion indices were determined. When the percentage of biomass in the blends was increased, the maximum mass loss rate was enhanced in the second region, and the ignition and burnout temperature was lowered, indicating the higher reactivity and better combustion performance of the samples. The comprehensive performance index presented an N shape with the increasing biomass blending ratio. Based on various combustion indices, 20% was an optimum percentage for the co-utilization of coal-biomass blends. A significant promoting interaction was observed between corn straw and rice straw blends, while inhibiting effects occurred between rice husk and coal. The kinetic parameters of the blends were evaluated by the Coats and Redfern method using the nth-order reaction model. The value of activation energy and the pre-exponential factor increased with the decreasing biomass percentage in the blends.

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Section: Fuel Properties Of a Single Samplementioning

confidence: 99%

Section: Synergistic Effect Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Co-Combustion Characteristics of Typical Biomass and Coal Blends by Thermogravimetric Analysis

Yuan

Tan

et al. 2021

Front. Energy Res.

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“…Ozawa-Flynn-Wall method was used for determination of kinetic parameters. Konwar et al studied how the addition of biomass influences the pyrolysis behavior of low-rank sub-bituminous coal [8]. Pyrolysis experiments were performed in a nitrogen atmosphere with linear heating rates of 5, 10 and 20 °C/min.…”

Section: Introductionmentioning

confidence: 99%

Determination of Kinetic Parameters of Cheery Tree Pyrolysis Using Kissinger Method

Protić¹,

Miltojević²,

Raos³

et al. 2020

FU Work Liv Env Prot

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In the global quest for substitution of fossil fuels, biomass is regarded as one of the most promising alternatives. Thermochemical conversion is one of the dominant biomass-to-energy processing routes with pyrolysis as one of the options that gained importance in recent years. In this paper pyrolysis experiments of cheery tree samples were performed. The objective of this research was to determine selected physical and chemical properties of cheery related to thermochemical conversion. The samples were pyrolysed in a thermogravimetric analyzer in an inert, nitrogen, atmosphere at four different heating rates 1, 2, 5 and 10 °C/min. Pyrolysis occurred, as expected, in three step: loss of moisture and light volatiles, active and passive pyrolysis. With an increase in heating rate a lateral shift of the maximum rate of weight loss for the thermal decomposition to higher temperatures was observed, as well as an increase in the amount of residual char. Moreover, kinetic studies were performed using the Kissinger method. The activation energy was calculated to be 155.26 kJ/mol, while the pre-exponential factor was 1.685×1012 min-1. Obtained results are comparable to values reported in literature. Kissinger method is straightforward and offers the possibility for fast and reliable determination of kinetic parameters.

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Effect of beeswax and petroleum wax on the thermal degradation behavior, kinetics, and thermodynamics of low‐grade coal

Behera,

Mahapatra,

Sabat

et al. 2024

Environmental Quality Mgmt

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The co‐pyrolysis behavior of low‐grade coal with two different feedstocks (beeswax and petroleum wax) at different compositions (w/w) [(75:25), (50:50), (25:75)] is investigated by using a thermogravimetric (TG) analyzer under the non‐isothermal condition at a constant heating rate of 20°C/min from an ambient temperature to 900°C under nitrogen atmosphere. The kinetic and thermodynamic analysis for the thermal decomposition of the sample parameters was carried out by applying the model fitting Coats–Redfern method to the thermogravimetry data of different feedstocks. The activation energy of thermal degradation of coal is found to be 55.8 kJ/mole. A decrease in activation energy is observed by the addition of 25% and 50% waxes in the blended sample and the blended sample with 25% wax and 75% coal has the lowest activation energy. The activation energy for coal‐beeswax blend (75:25) is 35.718 KJ/mol, but it is 34.237 KJ/mol for coal‐petroleum wax blend (75:25). The value of ∆H decreases by the addition of waxes and follows the order (Coal: Feedstock) {(75:25) < (50:50) < (25:75)}, while that of value of ∆S increases by the addition of waxes and follows the order {(75:25) > (50:50) > (25:75)}. However, the value of ΔG does not significantly shift as the blend ratio of the feedstocks is altered. The addition of both feedstocks with the coal sample showed some degree of synergy. The result illustrates that the co‐pyrolysis of coal with wax be energy economical than individual pyrolysis and this study would give precious scope to design a more efficient conversion system.

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Effect of biomass addition on the devolatilization kinetics, mechanisms and thermodynamics of a northeast Indian low rank sub-bituminous coal

Cited by 50 publications

References 53 publications

Co-Combustion Characteristics of Typical Biomass and Coal Blends by Thermogravimetric Analysis

Co-Combustion Characteristics of Typical Biomass and Coal Blends by Thermogravimetric Analysis

Determination of Kinetic Parameters of Cheery Tree Pyrolysis Using Kissinger Method

Effect of beeswax and petroleum wax on the thermal degradation behavior, kinetics, and thermodynamics of low‐grade coal

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