Transformation of sulfur and nitrogen during Shenmu coal pyrolysis

Hou, Jili; Ma, Yue; Li, Shuyuan; Jian, Shi; He, Lu; Li, Jia

doi:10.1016/j.fuel.2018.05.046

Cited by 106 publications

(27 citation statements)

References 39 publications

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“…Since the initial decomposing temperature for every sulfur compound is different, it is rational to use the peak area and peak temperature in TG-MS spectra to analyze the composition and structure changes of sulfur compounds in residues. , Moreover, the TG technology has been considered as an effective method to simulate the coking process of petroleum residues . Hence, in the present work, TG-MS analysis was carried out to demonstrate the sulfur evolution in the RHT process and assess the thermal performance of sulfur compounds during the DC process.…”

Section: Resultsmentioning

confidence: 99%

An Insight into the Evolution of Sulfur Species during the Integration Process of Residue Hydrotreating and Delayed Coking

Zhao

Ren

Liu

et al. 2020

Ind. Eng. Chem. Res.

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Integration technology of residue hydrotreating (RHT) and delayed coking (DC) was first proven to be an effective strategy to process high-sulfur residue oil while reducing the coke yield and simultaneously controlling the sulfur content of coke. Then, the evolution of sulfur species in the integration process was investigated by XPS, online TG-MS analysis, and atmospheric pressure photoionization FT-ICR MS. Finally, the essential effects of the RHT process on sulfur evolution were evaluated. The RHT process optimized the conversion of the refractory thiophenic sulfurs into sulfidic sulfurs as indicated by the increasing abundance of sulfidic sulfur during RHT, which thereby helped to reduce the sulfur content in coke. Moreover, RHT promoted the saturation of condensed-aromatic-ring structures of some refractory thiophenic sulfurs and thus promoted the thermal cracking of these sulfurs, and the resulting sulfurs with a smaller size thereupon directly evaporate into the liquid products, thus further reducing the sulfur content in coke.

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Section: Resultsmentioning

confidence: 99%

An Insight into the Evolution of Sulfur Species during the Integration Process of Residue Hydrotreating and Delayed Coking

Zhao

Ren

Liu

et al. 2020

Ind. Eng. Chem. Res.

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“…With the increase in the pyrolysis temperature, the content of PAHs increased first and then decreased, reaching the maximum at 800 °C. Hou et al 60 reported that the content of thiophene-type sulfur and pyrrole-type nitrogen in coal semicoke increased with the increase in the pyrolysis temperature from 300 to 700 °C. However, the content of pyridine-type nitrogen decreased.…”

Section: Results and Discussionmentioning

confidence: 99%

Pyrolysis Temperature Effect on Compositions of Neutral Nitrogen and Acidic Species in Shale Oil Using Negative-Ion ESI FT-ICR MS

et al. 2020

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Negative-ion electrospray ionization (ESI) Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS) was used to study the effect of the pyrolysis temperature (400, 430, 460, 490, and 520 °C) on acidic and neutral nitrogen species in Huadian shale oil. To more accurately analyze the influence, shale oils produced during the heat-up stage were abandoned. The results show that because of the influence of polymerization and cracking reactions, the increase in temperature increases the content of pyrrole, thiophene, furan, phenol, and aromatic ring cores and decreases the content of carboxylic acid, respectively. Among all the heteroatom compounds identified from negative-ion ESI FT-ICR MS, the relative abundance of N 1 O 1 , N 1 O 2 , N 1 O 3 , N 2 , N 2 O 1 , O 1 , O 3 , O 1 S 1 , and N 1 S 1 species increases, whereas that of O 2 and O 4 species decreases as the pyrolysis temperature increases. The decrease in the O 2 species can be attributed to carboxylic acid with a double-bond equivalence (DBE) value of 1, whereas the increase in the O 2 species with DBE values of 7 and 9 can be attributed to the formation of furan, phenol, and aromatic ring by the polymerization reaction at higher pyrolysis temperatures. Although the effect of the reaction temperature on the molecular composition of acidic and neutral nitrogen species is complex, still characteristic rules are found in this study.

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“…Because incineration is carried out in oxidizing atmosphere, the nitrogen-and sulfur-containing compounds in sewage sludge would convert to air pollutants NO x and SO x , causing major environmental problems such as acid rain and photochemical fog [46,47]. HCl and Cl 2 can also be detected in the flue gas while incinerating sewage sludge due to the presence of chlorine in the feedstock [48], which leads to corrosion of incinerator [49].…”

Section: Pollutants Emissionmentioning

confidence: 99%

Thermochemical conversion of sewage sludge for energy and resource recovery: technical challenges and prospects

Zhang

et al. 2021

Environmental Pollutants and Bioavailability

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Thermochemical processes are considered as a promising technology for sewage sludge management, which could achieve volume reduction, energy and resource recovery, and effective destruction of pathogens. However, there are still many technology limitations and challenges of the thermochemical processes toward industrialization and commercialization. This review first briefly discusses the impact of sewage sludge on environmental sustainability and its current treatment and disposal methods. Typical thermochemical conversion technologies i.e., incineration/combustion, pyrolysis, gasification, and hydrothermal liquefaction for energy and resource recovery from sewage sludge are then comprehensively summarized. Subsequently, the technical challenges of thermochemical conversion of sewage sludge and the solutions that have been and/or are being developed to address the challenges are in-depth analyzed. Meanwhile, the prospects and future directions of the thermochemical technologies are outlined. In addition, the economic analysis and life cycle assessment of thermochemical conversion technologies are evaluated. Finally, the conclusions are put forward.

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Transformation of sulfur and nitrogen during Shenmu coal pyrolysis

Cited by 106 publications

References 39 publications

An Insight into the Evolution of Sulfur Species during the Integration Process of Residue Hydrotreating and Delayed Coking

An Insight into the Evolution of Sulfur Species during the Integration Process of Residue Hydrotreating and Delayed Coking

Pyrolysis Temperature Effect on Compositions of Neutral Nitrogen and Acidic Species in Shale Oil Using Negative-Ion ESI FT-ICR MS

Thermochemical conversion of sewage sludge for energy and resource recovery: technical challenges and prospects

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