scholarly journals Effect of hydrogen-rich gas from char gasification on rapid pyrolysis products of low rank coal in a downer pyrolyzer

RSC Advances ◽  
2021 ◽  
Vol 11 (61) ◽  
pp. 38537-38546
Author(s):  
Ting Li ◽  
Yong Li ◽  
Yanan Cheng ◽  
Xiaorong Li ◽  
Yanfeng Shen ◽  
...  
Keyword(s):  
Low Rank ◽  
Coal Pyrolysis ◽  
Low Rank Coal ◽  
Pyrolysis Products ◽  
Coal Gas ◽  
Char Gasification ◽  
Rapid Pyrolysis

Simulated coal gas from char gasification played a different role at different temperature (550–700 °C) during coal pyrolysis.

scholarly journals Pyrolysis of a typical low-rank coal: application and modification of the chemical percolation devolatilization model

RSC Advances ◽  
2021 ◽  
Vol 11 (29) ◽  
pp. 17993-18002
Author(s):  
Tong Lv ◽  
Mengxiang Fang ◽  
Huaixiang Li ◽  
Jiqing Yan ◽  
Jianmeng Cen ◽  
...  
Keyword(s):  
Prediction Accuracy ◽  
Low Rank ◽  
Coal Pyrolysis ◽  
Low Rank Coal ◽  
Pyrolysis Products

The modified CPD model with tar consumption and a gas correlation expression improved the prediction accuracy of coal pyrolysis products and provides a reference for their application over a wider range of conditions.

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

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

Research on the Microwave Pyrolysis of Coal under N2 Atmosphere

2014 ◽  
Vol 672-674 ◽  
pp. 672-675
Author(s):  
Jun Zhou ◽  
Zhe Yang ◽  
Wen Zhi Shang ◽  
Yong Hui Song ◽  
Xin Zhe Lan
Keyword(s):  
Flow Rate ◽  
Microwave Power ◽  
Loss Rate ◽  
New Technology ◽  
Low Rank ◽  
Low Rank Coal ◽  
Weight Loss Rate ◽  
Pyrolysis Products ◽  
Microwave Pyrolysis ◽  
Liquid Products

Microwave pyrolysis of low rank coal is a new technology of cleaner production. The effect of microwave power and flow rate of N2 on the yield of pyrolysis products under N2 atmosphere was explored. The results showed that the higher microwave power was, the higher all the terminal temperature, the yield of liquid products and the weight loss rate were. The flow rate of N2 had little influence on the yield of pyrolysis solid products, while it exerted a greater influence on the yield of pyrolysis liquid products. When the low rank coal was pyrolysised under the conditions of microwave power of 800W and flow rate of N2 of 4.0×10-4 m3/min, the yield of Bluecoke and liquid products respectively reached 65.8% and 18%.

Influence of Fe2 O3 /CaO Catalysts on the Pyrolysis Products of Low-Rank Coal

2015 ◽  
Vol 3 (10) ◽  
pp. 1068-1071 ◽  
Author(s):  
Xiaohan Cheng ◽  
Xuanming He ◽  
Cheng Chen ◽  
Shuang Yi
Keyword(s):  
Low Rank ◽  
Low Rank Coal ◽  
Pyrolysis Products

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.

scholarly journals The Resources of Oil-rich Coals in China

2021 ◽  
Author(s):  
Shuzheng Ning ◽  
Li Zhang ◽  
XinQian Shu ◽  
JianQiang Zhang ◽  
Zhuo Zou ◽  
...  
Keyword(s):  
Mining Area ◽  
Low Rank ◽  
Shaanxi Province ◽  
Volatile Content ◽  
Low Rank Coal ◽  
Coal Resources ◽  
Coal Gas ◽  
Development And Utilization ◽  
Resource Characteristics ◽  
Coal Reserves

Abstract The resource characteristics of coal-rich, oil-deficient, and low-gas have determined the need to fully exploit the advantages of coal resources in China. China holds a large amount of low-rank coal with high volatile content and high tar yield. Based on the abundant oil-rich and low-rank coal resources, resource evaluation and research on its development and utilization are of great significance to the coal geology. According to the estimated reserves, the low-rank coal reserves are about 63.86 billion tons. Among the low-rank coals, the tar yield is greater than 7%, which is called oil-rich coal. Gas and semi-coke resources, which can greatly increase the application value of this type of coal resources. The oil-rich coal resources are widely distributed in the Carboniferous-Permian, Triassic, Jurassic, Cretaceous, and Neogene in China. They are mainly distributed in the three provinces of Inner Mongolia, Shaanxi, Xinjiang, and also Qinghai and Gansu in space. The Carboniferous-Permian oil-rich coal is mainly distributed in Shaanxi Fugu mining area, and the Triassic oil-rich coal is mainly distributed in the Zichang mining area of Shaanxi Province. It shows that the oil-rich coals are mainly lignite and long-flame coal with low metamorphism but also contains a small amount of gas coal and gas-fat coal. The tar yield and volatile content generally have a positive correlation. It has great significance to further study on the oil-rich coal resources.

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