High-pressure pyrolysis and CO2-gasification of coal maceral concentrates: conversions and char combustion reactivities

Megaritis, A.; Messenböck, R.; Chatzakis, Ioannis; Dugwell, D. R.; Kandiyoti, R.

doi:10.1016/s0016-2361(99)00003-4

Cited by 42 publications

(15 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Isolating resinites from coals in sufficient quantities for experimentation, however, is usually difficult. Our previous work on coal constituents ( macerals )2–5 has been confined to the broader, less specific but more accessible coal fractions: vitrinites, inertinites and liptinites, where liptinites include, among others, resinites as a subgroup.…”

mentioning

confidence: 99%

Structural characterisation of Baltic amber and its solvent extracts by several mass spectrometric methods

Islas

Suelves

Carter

et al. 2001

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

A sample of Baltic amber ( approximately 40 million yrs old) has been extracted using pentane, toluene and 1-methyl-2-pyrrolidinone (NMP). The relationship between solubility characteristics of the extracts in relation to molecular mass and chemical makeup has been investigated. The extracts were first characterised by (13)C-NMR spectrometry, size exclusion chromatography (SEC) and UV-fluorescence spectroscopy. The fractions differed less in terms of chemical structural features than they did in terms of molecular mass. This contrasts markedly with data on fractions of coal-derived liquids, but parallels results from petroleum-derived vacuum residues. In SEC, the toluene soluble/pentane insoluble fraction gave a peak for high mass material at about 67 000 u. Material excluded from the column porosity in this fraction and in NMP solubles eluted between 8 and 11 min, corresponding to polystyrene masses between 200 000 and several million u. A column with a larger pore size distribution was calibrated using polystyrene and polymethylmethacrylate standards with detection by a light-scattering evaporative analyser. The largest polystyrene standard (15.4 million u) eluted at 13.4 min, similar to that of the earliest eluting amber-derived material in the NMP solubles fraction. Results from probe-MS and pyrolysis-GC/MS have been used to confirm the similarity of chemical structures of the three solubility fractions. Broadly, low mass ions appear to correspond to the various monomeric units of structures present in the amber, the higher mass ions to dimer units and the molecular ions to the different combinations of three or more monomeric units. The main monomer groups have been identified in detail, showing a situation very different from that of coal-derived materials, where the sizes of aromatic ring systems increase with molecular size.

show abstract

mentioning

confidence: 99%

Structural characterisation of Baltic amber and its solvent extracts by several mass spectrometric methods

Islas

Suelves

Carter

et al. 2001

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

show abstract

“…Moreover, as is shown in Figure 1, as increasing of inertinite content in coal (Table 1), the sample pyrolysis reaction rate decreases. This probably is due to the fact that inertinite, which contains more aromatic structure units, cannot be opened easily at lower pyrolysis temperature so that their reaction required an induction period (Megaritis et al, 1999). On the other hand, with an increase of oxygen content in coal (Table 1), the gasification reaction rate increases, which may be because with the oxygen content increasing in coal, the surface oxygen increases and leads to an activity site, and carbon-oxygen complex increases (Zhuang et al, 1996).…”

Section: Resultsmentioning

confidence: 99%

“…Liu et al (2004) investigated the effect of pyrolysis time on the gasification reactivity of char with CO 2 and found that a longer pyrolysis time led to lower reactivity of a char and this effect leveled off as pyrolysis time increased. Moreover, the pore structure of coal or char (Kasaoka et al, 1987;Liu et al, 2000), reaction ambience (Fushimi et al, 2003;Roberts and Harris, 2007), and petrographic component (Megaritis et al, 1999;Sun et al, 2004;Zhuang et al, 1996) have also a remarkable effect on coal gasification reactivity. Mineral matter in coals has been known to influence gasification reactivity because of the presence of catalytically active components (Kyotani et al, 1993;Lemaignen et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Chang

2015

Energy Sources, Part A: Recovery, Utilization, and Environmenta

View full text Add to dashboard Cite

Coals with different reducibility and their macerals in China were chosen as the experimental samples. The pyrolysis and isotherm CO 2 -gasification reactivity and their influencing factors were investigated by thermogravimetric analysis method. The results show that the coal with stronger reducibility has higher pyrolysis reactivity and lower gasification extent than that of the coal with weaker reducibility. With the increase of holding temperature time and pyrolysis final temperature, coal pyrolysis extent increases, while the sample isotherm gasification reactivity presents different properties. Vitrinites show higher pyrolysis reactivity and lower gasification extent than that of raw coals and inertinites. In addition, maceral origin has a remarkable effect on the pyrolysis and isotherm gasification reactivity of coal samples.

show abstract

“…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. It is reported [13,16] that at a short gasification residence time (10 s), the conversion is in the order of liptinite> vitrinite> inertinite, while at a long residence time (200 s), the extent of gasification was found to be inertinite> vitrinite>liptinite. 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.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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

View full text Add to dashboard Cite

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.

show abstract

High-pressure pyrolysis and CO2-gasification of coal maceral concentrates: conversions and char combustion reactivities

Cited by 42 publications

References 22 publications

Structural characterisation of Baltic amber and its solvent extracts by several mass spectrometric methods

Structural characterisation of Baltic amber and its solvent extracts by several mass spectrometric methods

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

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

Contact Info

Product

Resources

About