A TGA Investigation to Co‐Pyrolysis Characteristics of Shenhua Direct Coal Liquefaction Residue and Huolinhe Lignite and the CO 2 Gasification Behavior of the Derived Char

2020 ◽  
Vol 5 (39) ◽  
pp. 12103-12108
Author(s):  
Tao Fan ◽  
Yang Qu ◽  
Zhibing Chang ◽  
Lingmei Zhou ◽  
Yan Hao ◽  
...  
Keyword(s):  
Coal Liquefaction ◽  
Pyrolysis Characteristics ◽  
Direct Coal Liquefaction ◽  
Coal Liquefaction Residue

Effects of Direct Coal Liquefaction Residue Additions on Low-Rank Pulverized Coal during Co-Pyrolysis

2020 ◽  
Vol 999 ◽  
pp. 167-177
Author(s):  
Ning Yin ◽  
Yong Hui Song ◽  
Jun Zhou ◽  
Yu Hong Tian ◽  
Ai Wu Yang
Keyword(s):  
Weight Loss ◽  
Free Radical ◽  
Loss Rate ◽  
Coal Liquefaction ◽  
Low Rank ◽  
Coke Yield ◽  
Weight Loss Rate ◽  
Pyrolysis Characteristics ◽  
Direct Coal Liquefaction ◽  
Coal Liquefaction Residue

This study examined the co-pyrolysis characteristics of low-rank coal (SJC) and direct coal liquefaction residue (DCLR) through thermogravimetric analysis coupled with Fourier transform infrared spectrometry. It also investigated the influences of different mass fractions of DCLR to SJC on the co-pyrolysis characteristics and release regulation of gas phase components. Results showed that with increasing DCLR content, coke yield initially decreased and then increased, but tar and gas yield reversed. Different addition of DCLR changed the composition of the pyrolysis gas in various degrees, and reduced the content of-OH and nitrogen compounds in coke. The H2 content in the gas gradually increased. When 40% DCLR was added, the maximum tar yield was 22.79%, and the maximum H2 yield was 37.12%. At 60% DCLR, the lowest semi-coke yield was 65.01%, and the highest gas yield was 14.65%. The co-pyrolysis of SJC and DCLR can be divided into three stages. The first was the dry degassing stage, during which the adsorbed gas and small-molecule gas were removed on the coal surface at room temperature to 350 °C. The second stage (350 °C–650 °C) was the intense pyrolysis reaction stage, during which a large number of volatiles were obtained. The substantial weight loss rate peak appeared around 450 °C. The weight loss rate of pyrolysis gradually increased with increasing DCLR dosage. The co-pyrolysis of SJC and DCLR was not a simple sum between SJC and DCLR, which indicated a synergistic effect in the co-pyrolysis. The synergistic effect between SJC and DCLR enhances the interaction between free-radical fragments, thereby increasing the yield of pyrolysis tar. The third stage was the shrinkage of semi-coke from 650 °C to the end of the reaction. The polycondensation reaction between free-radical fragments to form solid coke with higher aromaticity, and H2 released.

Study on Properties of the Blends with Direct Coal Liquefaction Residue and Asphalt

2014 ◽  
Vol 488-489 ◽  
pp. 316-321 ◽  
Author(s):  
Jie Ji ◽  
Yong Shang Zhao ◽  
Shi Fa Xu
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Processing Method ◽  
Coal Liquefaction ◽  
Direct Influence ◽  
Processing Methods ◽  
High Temperature Properties ◽  
Additive Content ◽  
Direct Coal Liquefaction ◽  
Coal Liquefaction Residue

This paper studies the properties of the blends composed of DCLR (direct coal liquefaction residue) and asphalt using two different processing methods, compares the regulation that the DCLR additive content and processing method take influence on the high-temperature properties, low-temperature properties and durability of the blends. It is found that the DCLR can improve the high-temperature properties of asphalt but degrade its low-temperature properties. The properties of blends composed of DCLR, asphalt and furfural extract oil are tested and analyzed by adding a certain amount of furfural extract oil into it, which shows that adding DCLR can improve the high-temperature properties of asphalt and reduce its low-temperature properties but can hardly cause any impact on the properties of the blends. In addition, the processing method has a direct influence on the properties of blends.

scholarly journals Recycling Molybdenum from Direct Coal Liquefaction Residue: A New Approach to Enhance Recycling Efficiency

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 306
Author(s):  
Chunling Wu ◽  
Yang Luo ◽  
Kai Zhao ◽  
Xiaobing Yu ◽  
Xian Zhang ◽  
...  
Keyword(s):  
Coal Liquefaction ◽  
X Ray Diffraction ◽  
New Approach ◽  
Sublimation Temperature ◽  
Thermal Analyzer ◽  
Ft Ir ◽  
Set Up ◽  
Direct Coal Liquefaction ◽  
Coal Liquefaction Residue ◽  
Optimum Extraction

In this paper, direct coal liquefaction residue was prepared from Shen-dong coal, and the solubility of the residue in five organic solvents was studied. Then, an experimental device was set up to recover molybdenum (Mo) compounds from the direct coal liquefaction residue after extraction, and the influences of sublimation temperature and duration on recycling efficiency were examined. The recycled Mo-based products were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and a thermal analyzer. The results reveal that the optimum extraction conditions were obtained through ultrasonic extraction with a quinoline solvent and the highest recycling efficiency occurred for sublimation at 900 °C for 30 min. The recycled products are identified to be α-MoO3 crystals. Moreover, the α-MoO3 crystal is thermally stable before the temperature reaches its melting point.

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