Pyrolysis and Gasification Reactivity of Several Typical Chinese Coals and Their Macerals

Wang, J.-H.; Chang, Liping

doi:10.1080/15567036.2011.594857

Cited by 11 publications

(3 citation statements)

References 20 publications

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“… 12 According to Li et al, each maceral in coal has different thermal stability from others. 13 It was also discovered that vitrinite has a higher pyrolysis reactivity than inertinite, 14 and the number of broken covalent bonds in vitrinite after pyrolysis is far greater than those in inertinite. 15 Inertinite has a higher condensation index of aromatic rings and graphitizes faster than vitrinite during pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

Effects of Functional Groups in Coal with Different Vitrinite/Inertinite Ratios on Pyrolysis Products

et al. 2023

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Maceral composition is one of the key factors affecting the liquefaction and gasification of coal, which has attracted extensive attention of researchers working on coal chemical industry. To elucidate the impact of vitrinite and inertinite in coal on pyrolysis products, vitrinite and inertinite were extracted from a single coal sample and mixed to create six samples with varying vitrinite/inertinite ratios. The samples were subjected to thermogravimetry coupled online with mass spectrometry (TG–MS) experiments, and the Fourier transform infrared spectrometry (FITR) experiment was used to determine the macromolecular structures before and after the TG–MS experiments. The results show that the maximum mass loss rate is proportional to the vitrinite content and inversely proportional to the inertinite content, and increased vitrinite content accelerates the pyrolysis process and shifts the pyrolysis peak to low temperatures. Based on FTIR experiments, the sample’s CH2/CH3 content, representing the length of aliphatic side chains, decreases significantly after pyrolysis, and the greater the loss of CH2/CH3, the greater the intensity of organic molecule production, indicating that aliphatic side chains are likely to yield organic molecule products. The aromatic degree (I) of samples rises sharply and steadily with increasing inertinite content. After high-temperature pyrolysis, the polycondensation degree of aromatic rings (DOC) and relative abundance of aromatic and aliphatic hydrogen (Har/Hal) within the sample increased significantly, indicating the thermal degradation rate of aromatic hydrogen content is much lower than that of aliphatic hydrogen. When the pyrolysis temperature is lower than 400 °C, the higher the inertinite content, the easier it is to produce CO2, whereas an increase in vitrinite leads to an increase in CO production. At this stage, the “–C–O–” functional group is pyrolyzed to produce CO and CO2. When the temperature exceeds 400 °C, the CO2 output intensity of vitrinite-rich samples is much higher than that of inertinite-rich samples, while the CO output intensity of vitrinite-rich samples is lower, and the higher the vitrinite content, the higher the peak temperature of CO gas production of samples, indicating that when the temperature exceeds 400 °C, the increase of vitrinite inhibits CO production and promotes CO2 production. At this stage, the reduction of each sample’s “–C–O–” functional group after pyrolysis is positively correlated with the maximum CO gas production intensity, and the reduction of each sample’s “–CO” functional group after pyrolysis is positively correlated with the maximum CO2 gas production intensity. As a result, the “–C–O–” functional group is more likely to produce CO, whereas the “–CO” functional group is more likely to be pyrolyzed to CO2. Hydrogen is primarily produced during the polycondensation and aromatization processes, and its production is proportional to the dynamic DOC values after pyrolysis. The higher the I value after pyrolysis, the lower the maximu...

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Section: Introductionmentioning

confidence: 99%

Effects of Functional Groups in Coal with Different Vitrinite/Inertinite Ratios on Pyrolysis Products

et al. 2023

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“…In the past few decades, experimental studies on the structural transformation of macerals and the change in chemical reactivity during pyrolysis/gasification have attracted significant attention [13][14][15][16][17][18]. For example, Sun et al [14] compared the structural variations of the macerals before and after pyrolysis and found that vitrinite led to the yield of more aliphatic C-H and lowered aromaticity than inertinite.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, Sun et al [17] conducted CO2 gasification of vitrinite char and inertinite char in a pressurized thermobalance at a temperature up to 950 ºC and reported that the vitrinite char was more reactive than the inertinite char with or without a catalyst. However, more recently, Wang et al [18] stated that the gasification reactivity of vitrinite was lower than that of inertinite under CO2 gasification atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Gasification of Coal and Its Macerals and Prediction of the Synergistic Effects Under Typical Entrained-Bed Pulverized Coal Gasification Conditions

Jiang

Guo

Luo

et al. 2019

Journal of Energy Resources Technology

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This research is focused on the gasification performance of coal and its corresponding macerals as well as on the interactions among macerals under typical gasification conditions by Aspen Plus modeling. The synergistic coefficient was employed to show the degree of interactions, while the performance indicators including specific oxygen consumption (SOC), specific coal consumption (SCC), cold gas efficiency (CGE), and effective syngas (CO + H2) content were used to evaluate the gasification process. Sensitivity analyses showed that the parent coal and its macerals exhibited different gasification behaviors at the same operating conditions, such as the SOC and SCC decreased in the order of inertinite > vitrinite > liptinite, whereas CGE changed in the order of liptinite > vitrinite > inertinite. The synergistic coefficients of SOC and SCC for the simulated coals were in the range of 0.94–0.97, whereas the synergistic coefficient of CGE was 1.05–1.13. Moreover, it was found that synergistic coefficients of gasification indicators correlated well with maceral contents. In addition, the increase in temperature was found to promote the synergistic coefficients slightly, whilst at an oxygen to coal mass ratio of 0.8 and a steam to coal mass ratio of 0.8, the highest synergistic coefficient was obtained.

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Charging mechanism analysis of macerals during triboelectrostatic enrichment process: Insights from relative dielectric constant, specific resistivity and X-ray diffraction

Sun

Chen

et al. 2018

Fuel

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Pyrolysis and Gasification Reactivity of Several Typical Chinese Coals and Their Macerals

Cited by 11 publications

References 20 publications

Effects of Functional Groups in Coal with Different Vitrinite/Inertinite Ratios on Pyrolysis Products

Effects of Functional Groups in Coal with Different Vitrinite/Inertinite Ratios on Pyrolysis Products

Comparative Study of the Gasification of Coal and Its Macerals and Prediction of the Synergistic Effects Under Typical Entrained-Bed Pulverized Coal Gasification Conditions

Charging mechanism analysis of macerals during triboelectrostatic enrichment process: Insights from relative dielectric constant, specific resistivity and X-ray diffraction

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