Sludge Acts as a Catalyst for Coal during the Co-Combustion Process Investigated by Thermogravimetric Analysis

Chen, Wendi; Wang, Fei; Kanhar, Altaf Hussain

doi:10.3390/en10121993

Cited by 15 publications

(5 citation statements)

References 32 publications

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“…The TG curves of CG and PVC can be roughly divided into three stages under an air or nitrogen atmosphere. The results of the three stages of weightlessness mass of CG are consistent with those from the aforementioned studies [4–7,15]; therefore, only the experimental results of PVC combustion and pyrolysis are analyzed.…”

Section: Resultssupporting

confidence: 77%

“…Owing to its ignition difficulty, unstable combustion, and low calorific value [3], researchers worldwide have investigated the combustion and co-combustion characteristics of CG. Recently, the co-combustion characteristics of CG was discussed in terms of the various properties of coal rather than non-coal substances [4–7]. Several scholars have conducted research on the co-combustion characteristics of CG with coal gas [8–12]; their results showed that the mixing ratio is the most important parameter to consider when optimizing the efficiency of co-combustion.…”

Section: Introductionmentioning

confidence: 99%

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Thermogravimetric analysis of the co-combustion of coal and polyvinyl chloride

Gao

2019

PLoS ONE

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Coal gangue has the shortcomings of low calorific value and refractory burnout, while polyvinyl chloride has the advantages of a long combustion process and high calorific value. In order to make up for these shortcomings of coal gangue, the possibility of a treatment method based on co-combustion of coal gangue with polyvinyl chloride, which can be centrally recovered from municipal solid waste, is proposed. In order to analyze the combustion effect of a mixture of these two substances, experimental samples were prepared by mixing these two substances in three different ratios, and they were tested by thermogravimetric analysis. The experimental results were compared, analyzed and evaluated. The effects of the proportion of polyvinyl chloride in the mixture on the temperature parameters, activation energy, and interaction during co-combustion were analyzed. In order to analyze the interaction during co-combustion of the two, a coupling analysis method for mixed combustion is presented, and the effectiveness of this method is verified by comparing with the correlation analysis results of co-combustion. The results show that co-combustion can mitigate the ignition difficulty and burnout of coal gangue. When the proportion of polyvinyl chloride in the mixture was increased from 20% to 80%, the maximum weightlessness rate of the first stage rapidly increased from 4.5%/min to 15.6%/min; however, that of the second stage slowly increased from 3.7%/min to 4.2%/min. A 20% proportion of polyvinyl chloride showed the most significant promotion of co-combustion, with a maximum coupling coefficient of 0.00318, which was 1.11 and 1.35 times greater than that of 50% and 80% proportions, respectively. Co-combustion can reduce the activation energy of coal gangue during the initial and end stages. Therefore, co-combustion is helpful to improve the problems of low calorific value and refractory burnout of coal gangue.

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Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Thermogravimetric analysis of the co-combustion of coal and polyvinyl chloride

Gao

2019

PLoS ONE

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“…Some of these reactions can involve interactions with heavy metals, as most of the organic volatiles were decomposed during the main oxidation process. Overall, oxidation is the longest stage with more than 60% of weight loss between 200 and 600 • C. Figure 3A further showed a relatively small weight loss at temperatures higher than 800 • C. According to Chen et al [48], this last stage corresponds to the burnout stage. Magdziarz and Wilk [49] suggested that the burnout happens due to the small part of the carbon left in the sample [49].…”

Section: Thermogravimetric Analysis Of the Ss And The Blends With Coalmentioning

confidence: 74%

“…Magdziarz and Wilk [49] suggested that the burnout happens due to the small part of the carbon left in the sample [49]. However, Chen et al [48] argued that the burnout stage corresponds to the decomposition of the remaining CaO, as reported to be 18.9 wt%, within the sludge as has been proposed by Folgueras et al [30]. Regression was performed for the data presented in Figure 3 and is available in the Supplementary Material (Figure S1, Equations (S1)-(S4)).…”

Section: Thermogravimetric Analysis Of the Ss And The Blends With Coalmentioning

confidence: 99%

Thermal Characterization, Kinetic Analysis and Co-Combustion of Sewage Sludge Coupled with High Ash Ekibastuz Coal

Aidabulov,

Zhakupov,

Zhunussova

et al. 2023

Energies

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Efficient utilization of natural resources and possible valorization of solid waste materials such as sewage sludge into secondary materials via thermal conversion and simultaneously recovering energy is vital for sustainable development. The continuous increase in metropolises leads to an enormous production of wet sewage sludge, which creates major environmental and technical issues. In this paper, the samples of sewage sludge from Astana’s waste water treatment plant are analyzed for their thermochemical properties, followed by thermogravimetric and kinetic analysis using the Flynn–Wall–Ozawa and Kissinger–Akahira–Sunose methods. Overall, the calorific value of sewage sludge sample was 18.87 MJ/kg and was comparable to that of the bituminous coal samples. The activation energy varied from 140 to 410 kJ/mol with changing conversion from 0.1 to 0.7. Further, mono-combustion and co-combustion experiments of the sewage sludge with high ash bituminous coal were conducted using the laboratory scale bubbling fluidized bed rig, respectively. The difference in NOx emissions between mono-combustion of sewage sludge and co-combustion with coal were at around 150 ppm, while this value for SO2 was similar in average, but fluctuates between 150 and 350 ppm. Overall, the findings of this study will be useful in developing a co-combustion technology for a sustainable disposal of municipal sewage sludge.

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“…The research of mathematical models should be further development. Thermal behavior of fuel has been widely studied by thermogravimetric analysis (TGA), which is an extensive and effective research method for studying thermal behavior [8][9][10][11][12]. Thermal characteristics of ignition temperature, burnout temperature, maximum combustion rate, and combustion kinetic parameters can be acquired to quantitatively analyze the thermal process of fuel [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Thermal Behavior of Coal Used in Rotary Kiln and Its Combustion Intensification

et al. 2018

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Pyrolysis and combustion behaviors of three coals (A, B, and C coals) were investigated and their combustion kinetics were calculated by the Freeman-Carroll method to obtain quantitative insight into their combustion behaviors. Moreover, the effects of coal size, air flow, oxygen content, and heating rate on coal combustion behaviors were analyzed. Results showed that the three coals have a similar trend of pyrolysis that occurs at about 670 K and this process continuously proceeds along with their combustion. Combustion characteristics and kinetic parameters can be applied to analyze coal combustion behaviors. Three coals having combustion characteristics of suitable ignition temperature (745-761 K), DTG max (14.20-15.72%/min), and burnout time (7.45-8.10 min) were analyzed in a rotary kiln. Combustion kinetic parameters provide quantitative insights into coal combustion behavior. The suitable particle size for coal combustion in a kiln is that the content of less than 74 µm is 60% to 80%. Low activation energy and reaction order make coal, especially C coal, have a simple combustion mechanism, great reactivity, be easily ignited, and a low peak temperature in the combustion state. Oxygen-enrichment and high heating rates enhance coal combustion, increasing combustion intensity and peak value, thus shortening burnout time.

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Sludge Acts as a Catalyst for Coal during the Co-Combustion Process Investigated by Thermogravimetric Analysis

Cited by 15 publications

References 32 publications

Thermogravimetric analysis of the co-combustion of coal and polyvinyl chloride

Thermogravimetric analysis of the co-combustion of coal and polyvinyl chloride

Thermal Characterization, Kinetic Analysis and Co-Combustion of Sewage Sludge Coupled with High Ash Ekibastuz Coal

Thermal Behavior of Coal Used in Rotary Kiln and Its Combustion Intensification

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