Investigation of combustion characteristics and kinetics of coal gangue with different feedstock properties by thermogravimetric analysis

Zhang, Yuanyuan; Guo, Yanxia; Cheng, Fangqin; Yan, Kezhou; Cao, Yan

doi:10.1016/j.tca.2015.06.018

Cited by 131 publications

(13 citation statements)

References 46 publications

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“…This finding was also consistent with the proximate analysis that the volatile content of extracted leaves was higher than that of non-extracted leaves. The results of the study were similar to those of Zhang et al (2015) who conducted the study on coal gangue. The results also explained the high ash and fixed carbon of nonextracted leaves' pellets presented in Table 1 very well.…”

Section: Analysis Of Combustion Performancesupporting

confidence: 85%

“…There was considerable difference in these parameters between the extracted and non-extracted leaves' pellets. As shown in Table 3, extracted leaves' pellets exhibited lower ignition and burnout temperature; in other words, extracted leaf pellets are easy to ignite and burn out (Zhang et al 2015). By comparing the maximum burning rate, the average burning rate, and the combustion characteristic index, extracted leaf pellets had a higher value than that of non-extracted.…”

Section: Table 3 Combustion Performance Parametersmentioning

confidence: 93%

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Effect of extractives on the physicochemical properties of biomass pellets: Comparison of pellets from extracted and non-extracted sycamore leaves

Liu

Chen

Jiang

et al. 2019

BioRes

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Physicochemical properties of biomass pellets were compared following their preparation from extracted and non-extracted sycamore leaves. The goal was to achieve high-quality biomass pellets. Batches of pellets were prepared at different moisture contents and pressure. The properties, including pellet density, diametric compressive strength, and combustion performance, were analyzed. Pellets produced from extracted leaves had higher pellet density (between 1125 and 1250 kg·m-3) compared to those made from non-extracted leaves. In addition, data of the combustion experiment showed more weight loss in extracted leaves’ pellets and a higher burning rate (9.54%·min-1) than that of non-extracted leaves’ pellets (8.47%·min-1). Also, the pellets made from extracted leaves could be ignited and burned easily compared to non-extracted leaves. However, the diametric compressive strength was not always higher in extracted leaves’ pellets compared to non-extracted. In general, it was concluded that extraction could increase the pellet density and improve combustion performance but did not fit the purpose to increase the diametric compressive strength. The analysis and conclusions can provide a reference for the production of high-quality biomass pellets.

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Section: Analysis Of Combustion Performancesupporting

confidence: 85%

Section: Table 3 Combustion Performance Parametersmentioning

confidence: 93%

Effect of extractives on the physicochemical properties of biomass pellets: Comparison of pellets from extracted and non-extracted sycamore leaves

Liu

Chen

Jiang

et al. 2019

BioRes

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“…Additionally, the flammability index for all the samples followed a similar trend. These ranges of reactivity indexes of our blends were found to be higher than those for coal samples, as reported elsewhere . For instance, the

D_{i}

value for our proposed fuel is

8.33 \times 10^{- 3},

which is higher than the

D_{i}

values of anthracite and lignite coal, which were

1.41 \times 10^{- 3}

1.41 \times 10^{- 3}

.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of petroleum coke thermal reactivity using Oxy‐cracking technique

2019

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Petroleum coke (petcoke) is a challenging fuel in terms of its complexity, high sulphur and nitrogen content, low volatile content, and undesirable emissions of SOx and NOx when used for power generation. To overcome these challenges, the oxy‐cracking process was recently proposed to convert the petcoke into a clean combustion fuel by reducing its sulphur and nitrogen contents, and consequently increasing its reactivity and combustibility. This work aimed to study the heating values and thermo‐oxidative behaviour of the oxy‐cracked petcoke, virgin petcoke, and their blends using thermogravimetric analysis (TGA). The results showed that the oxy‐cracked petcoke is oxidized at a temperature of 475 °C, which is easier and faster than the virgin petcoke, which is usually oxidized at around 540 °C. The heating value of the oxy‐cracked petcoke was not impacted and maintained constant ~30 MJ/kg, which is relatively similar to the virgin petcoke. The nitrogen and sulphur content in the oxy‐cracked petcoke is much lower than that of virgin petcoke. A significant improvement in the combustion performance parameters of the oxy‐cracked petcoke and their blends with virgin petcoke was achieved. For instance, the ignition temperature of the proposed fuel is reduced to 13 % compared to the virgin petcoke, which led to increasing the ignition index by two‐folds. Therefore, this approach might help in improving the thermal efficiency of petcoke by using oxy‐cracked products as an initiator in the combustion process.

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“…For coal (0:100), thermal degradation process starts at 320°C, with an initial mass gain arising from the chemisorption of oxygen on coal surface, which will cause the thermal decomposition to happen in increasing temperature [36][37][38] The events of mass loss related to volatile matter combustion (primary combustion) and the char combustion (secondary combustion) are not clearly distinguished ( Fig. 2a).…”

Section: Resultsmentioning

confidence: 99%

“…El-Sayed and Mostafa [15] also reported two exothermic peaks in DTA curves during sugarcane decomposition. According to Yuanyuan et al [38], the reactivity of samples can also be predicted by oxygen adsorption behavior, during the early stage of heating. The absence of mass gain in the related region of TG curve for bagasse sample suggests the formation of more unstable carbonoxygen complexes, which are easily desorbed at relatively low temperatures, increasing the reactivity of this biomass during volatiles release.…”

Section: Resultsmentioning

confidence: 99%

Co-firing of blends of sugarcane bagasse and coal

Mortari

Torquato

Crespi

et al. 2018

J Therm Anal Calorim

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The interaction effects between sugarcane bagasse and a Brazilian coal during co-firing were investigated by means of thermal decomposition behavior, comparison between theoretical and experimental results, activation energy, and ignition temperature. The blends were prepared in the ratios of 100:0; 75:25; 50:50; 25:75; 0:100 (bagasse/coal). The interaction effect evaluated in this study was related to the interference of the bagasse volatile matter content in the coal thermal decomposition. The thermal decomposition behavior analyses were performed in a thermogravimetric balance, and the apparent activation energy was determined by two different models-model-free and local linear integral isoconversional method-under two different heating rate ranges. The results showed that the high volatile content of the sugarcane bagasse leads to more intense combustion, lower ignition temperature, and more complex reaction mechanism, as compared to coal. When the fuels are blended, there is a temperature anticipation of the events related to the decomposition of the coal portion in the mixture, the reaction rates increase and the ash formation is affected. The kinetic data also suggested that the interaction between both materials may occur and improve the burnout of the blend in relation to the pure coal firing due to the contribution of sugarcane bagasse volatile matter. Nevertheless, the presence of the bagasse did not allow to lower activation energy during the blends devolatilization process.

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Investigation of combustion characteristics and kinetics of coal gangue with different feedstock properties by thermogravimetric analysis

Cited by 131 publications

References 46 publications

Effect of extractives on the physicochemical properties of biomass pellets: Comparison of pellets from extracted and non-extracted sycamore leaves

Effect of extractives on the physicochemical properties of biomass pellets: Comparison of pellets from extracted and non-extracted sycamore leaves

Enhancement of petroleum coke thermal reactivity using Oxy‐cracking technique

Co-firing of blends of sugarcane bagasse and coal

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