scholarly journals In Situ Catalytic Pyrolysis of Low-Rank Coal for the Conversion of Heavy Oils into Light Oils

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Muhammad Nadeem Amin ◽  
Yi Li ◽  
Xingmei Lu
Keyword(s):  
Energy Cost ◽  
Research Work ◽  
High Energy ◽  
Low Rank ◽  
Heavy Oils ◽  
Coal Pyrolysis ◽  
Low Rank Coal ◽  
Pyrolysis Tar ◽  
Liquid Yield

Lighter tars are largely useful in chemical industries but their quantity is quite little. Catalytic cracking is applied to improve the yield of light tars during pyrolysis. Consequently, in situ upgrading technique through a MoS2 catalyst has been explored in this research work. MoS2 catalyst is useful for the conversion of high energy cost into low energy cost. The variations in coal pyrolysis tar without and with catalyst were determined. Meanwhile, the obtained tar was analyzed using simulated distillation gas chromatograph and Elemental Analyzer. Consequently, the catalyst reduced the pitch contents and increased the fraction of light tar from 50 to 60 wt.% in coal pyrolysis tar. MoS2 catalyst increased the liquid yield from 18 to 33 (wt.%, db) and decreased gas yield from 27 to 12 (wt.%, db) compared to coal without catalyst. Moreover, it increased H content and hydrogen-to-carbon ratio by 7.9 and 3.3%, respectively, and reduced the contents of nitrogen, sulphur, and oxygen elements by 8.1%, 15.2%, and 23.9%, respectively, in their produced tars compared to coal without catalyst.

In-situ quantification of NO synthesis in a warm air glow discharge by WMS-based Mid-IR QCL absorption spectroscopy

2022 ◽  
Author(s):  
Chuanqi Wang ◽  
Junjie Qiao ◽  
Yijia Song ◽  
Qi Yang ◽  
Dazhi Wang ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Glow Discharge ◽  
Absorption Spectroscopy ◽  
Energy Cost ◽  
High Energy ◽  
Cathode Region ◽  
Synthesis Rate ◽  
No Production ◽  
Airflow Rate

Abstract Nitric oxide (NO) is one of the most crucial products in the plasma-based nitrogen fixation process. In this work, in-situ measurements were performed for quantifying the NO synthesis spatially in a warm air glow discharge, through the method of Mid-infrared quantum cascade laser absorption spectroscopy (QCL-AS). Two ro-vibrational transitions at 1900.076 cm-1 and 1900.517 cm-1 of the ground-state NO(X) were probed sensitively by the help of the wavelength modulation spectroscopy (WMS) approach to increase the signal/noise (S/N) level. The results show a decline trend of NO synthesis rate along the discharge channel from the cathode to the anode. However, from the point of energy efficiency, the cathode region is of significantly low energy efficiency of NO production. Severe disproportionality was found for the high energy consumption but low NO production in the region of cathode area, compared to that in the positive column zone. Further analysis demonstrates the high energy cost of NO production in the cathode region, is ascribed to the extremely high reduced electric field E/N therein not selectively preferable for the processes of vibrational excitation or dissociation of N2 and O2 molecules. This drags down the overall energy efficiency of NO synthesis by this typical warm air glow discharge, particularly for the ones with short electrode gaps. Limitations of further improving the energy cost of NO synthesis by variations of the discharge operation conditions, such as discharge current or airflow rate, imply other effective manners able to tune the energy delivery selectively to the NO formation process, are sorely needed.

The interaction between the char solid heat carrier and the volatiles during low-rank coal pyrolysis

2018 ◽  
Vol 136 ◽  
pp. 160-168 ◽  
Author(s):  
Xiao-hong Li ◽  
Bao-fu Li ◽  
Da-qing Fu ◽  
Jie Feng ◽  
Wen-ying Li
Keyword(s):  
Heat Carrier ◽  
Low Rank ◽  
Coal Pyrolysis ◽  
Low Rank Coal

In-situ catalytic upgrading of coal pyrolysis tar coupled with CO2 reforming of methane over Ni-based catalysts

2018 ◽  
Vol 177 ◽  
pp. 119-128 ◽  
Author(s):  
Mingyi Wang ◽  
Lijun Jin ◽  
Yang Li ◽  
Jiannan Lv ◽  
Baoyong Wei ◽  
...  
Keyword(s):  
Coal Pyrolysis ◽  
Co2 Reforming ◽  
Catalytic Upgrading ◽  
Co2 Reforming Of Methane ◽  
Pyrolysis Tar

In‐Situ Upgrading of Coal Pyrolysis Tar with Steam Catalytic Cracking over Ni/Al 2 O 3 Catalysts

2020 ◽  
Vol 5 (16) ◽  
pp. 4905-4912 ◽  
Author(s):  
Siqian Cao ◽  
Dechao Wang ◽  
Mingyi Wang ◽  
Jialong Zhu ◽  
Lijun Jin ◽  
...  
Keyword(s):  
Catalytic Cracking ◽  
Coal Pyrolysis ◽  
Pyrolysis Tar

Effect of char powder on gaseous tar reaction during low-rank coal pyrolysis

2021 ◽  
Vol 49 (5) ◽  
pp. 626-633
Author(s):  
Ting LI ◽  
Tian-zhou DU ◽  
Yan-feng SHEN ◽  
Lun-jing YAN ◽  
Jiao KONG ◽  
...  
Keyword(s):  
Low Rank ◽  
Coal Pyrolysis ◽  
Low Rank Coal

scholarly journals Modes of Occurrence of Chromium and Their Thermal Stability in Low-Rank Coal Pyrolysis

Processes ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 15
Author(s):  
Xiaobing Wang ◽  
Lingmei Zhou ◽  
Shuquan Zhu ◽  
Hao Zheng ◽  
Yue Ma ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Organic Matter ◽  
Low Rank ◽  
Chemical Extraction ◽  
Coal Pyrolysis ◽  
Low Rank Coal ◽  
Modes Of Occurrence ◽  
Sequential Chemical Extraction ◽  
Gas Products ◽  
Equilibrium Simulation

Chromium (Cr) and the emission of its compounds into the environment have caused long-term environmental contamination. In this study, the modes of occurrence of Cr in low-rank coal and their thermal stability in pyrolysis were investigated by sequential chemical extraction (SCE), single-component samples (SCS) pyrolysis, and thermochemical equilibrium simulation. The results showed that organic matter, aluminosilicate, and carbonate were the dominant modes of occurrence of Cr in low-rank coal. The modes of occurrence and chlorine (Cl) content affected the volatilization of Cr in coal. The characteristic release temperature range of Cr bounded to aluminosilicate was >600 °C and 400–600 °C for Cr bounded to a disulfide. Cr bounded to organic matter almost released completely before 600 °C. Cl enhanced the volatility of Cr and reduced its release temperature in Cr bounded to aluminosilicate. The simulation showed the content of gas products was very low, mainly chlorides. While the content of solid products, sulfides, and oxides, was much higher than gas products, showing their high thermal stability. The sulfides and oxides in chars were closely related to the carbonate and aluminosilicate bound form of Cr. The results of the equilibrium simulation were consistent with the experimental results.

A Research on Microwave and Conventional Pyrolysis for Low Rank Coal

2014 ◽  
Vol 1044-1045 ◽  
pp. 209-214
Author(s):  
Yong Hui Song ◽  
Xin Li ◽  
Jun Wei Shi ◽  
Xin Zhe Lan
Keyword(s):  
Aromatic Hydrocarbon ◽  
Phenolic Compound ◽  
Gas Analysis ◽  
Low Rank ◽  
Western China ◽  
Low Rank Coal ◽  
Pyrolysis Products ◽  
Microwave Pyrolysis ◽  
Pyrolysis Tar ◽  
Conventional Pyrolysis

In this paper, conventional pyrolysis (CP) and microwave pyrolysis (MWP) for three types of low rank coal in western China was studied. The effects of pyrolysis methods and temperature etc on product yields were also discussed. Pyrolysis products were characterized by IR, Gas analysis meter and GC-MS. Results showed that the tar and gas yields in microwave pyrolysis is about 3%-5% higher than those in the conventional pyrolysis. H2 and CO proportions in gas are above 55%. The contents of benzene, aromatic hydrocarbon and phenolic compound in microwave pyrolysis tar are higher than those in the conventional pyrolysis, in addition, C5~C10 substance content in tar is about 5 times as that in the conventional, so the microwave pyrolysis can prompt tar converting to light fraction.

scholarly journals Evolution Kinetics of Hydrogen Generation from Low Rank Coal Pyrolysis and Its Relation to the First Coalification Jump

2009 ◽  
Vol 25 (12) ◽  
pp. 2597-2603 ◽  
Author(s):  
LI Mei-Fen ◽  
◽  
ZENG Fan-Gui ◽  
SUN Bei-Lei ◽  
QI Fu-Hui
Keyword(s):  
Hydrogen Generation ◽  
Low Rank ◽  
Coal Pyrolysis ◽  
Low Rank Coal ◽  
Kinetics Of
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