A Research on Microwave and Conventional Pyrolysis for Low Rank Coal

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.

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Analysis of Products by Conventional and Microwave Induced Pyrolysis for Low Rank Coal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.524-527.871 ◽

2012 ◽

Vol 524-527 ◽

pp. 871-875

Author(s):

Yong Hui Song ◽

Jun Wei Shi ◽

Jian Ping Fu ◽

Xin Zhe Lan ◽

Qiu Li Zhang ◽

...

Keyword(s):

Phenolic Compounds ◽

Microwave Power ◽

Microwave Treatment ◽

Light Fraction ◽

Low Rank ◽

Low Rank Coal ◽

Microwave Pyrolysis ◽

Microwave Assisted ◽

Component Content ◽

Conventional Pyrolysis

This paper describes the products characteristic derived from the conventional pyrolysis (CP) and microwave-assisted pyrolysis (MWP) of low metamorphic coal. GC/MS were used to analyze the volatile fractions of tar obtained by pyrolysis at different temperature and microwave power. It was found that microwave treatment produces more gas and oil than conventional pyrolysis at 800w and 800°C. In addition, the gas from the microwave has much higher syngas (H2+ CO) contents (up to 55 vol. %) than those obtained by conventional hydrolysis (up to 42 vol. %). The tar from the microwave is mainly composed of aromatic pyrolysis and phenolic compounds, and the content is 47.398% and 13.831% respectively as the microwave power is 800w. Meanwhile, the tar component content of C5-C10from microwave pyrolysis is up to 5 fold than conventional pyrolysis. By contrast, the microwave-assisted pyrolysis is beneficial to the tar conversion to light fraction.

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Research on the Microwave Pyrolysis of Coal under N2 Atmosphere

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.672-674.672 ◽

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%.

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Low-Temperature Co-Pyrolysis Products of Low Rank Coal and Enteromorpha

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1008-1009.307 ◽

2014 ◽

Vol 1008-1009 ◽

pp. 307-311

Author(s):

Chun Xia Wang ◽

Xuan Ming He ◽

Xian Can Zeng ◽

Du Zhang

Keyword(s):

Sem Analysis ◽

Low Rank ◽

Low Rank Coal ◽

Pyrolysis Gas ◽

Pyrolysis Products ◽

Pyrolysis Characteristics ◽

Pyrolysis Tar ◽

Dry Distillation ◽

Heat Value ◽

Distillation Equipment

Co-pyrolysis characteristics of low rank coal (LRC) and enteromorpha (EN) in different proportins were studied in a dry distillation equipment. The results show that he maximum tar yiled of blends was 11.39% with a EN ration of 30%, which increased by 28.61% compared to LRC pyrolysis alone. In the co-pyrolysis tar ,the alkanes’ content was 48.66% and the phenolic was 9.12%, which was significantly higher than the content of the corresponding components of the original tar. The H/C ratio was increased by 9.87%. It indicated the pyrolysis tar became lighter on some degree. While the contents of CH4and H2in the pyrolysis gas were increased. SEM analysis showed the surface of co-pyrolysis semi-coke became rough and formed obvious center cracks. The heat value of co-pyrolysis semi-coke was higher than that of semi-coke from LRC.

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Contrastive Study on Microwave Pyrolysis Products of Coal under N2 and Non-N2 Atmosphere

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.672-674.601 ◽

2014 ◽

Vol 672-674 ◽

pp. 601-604

Author(s):

Zhe Yang ◽

Jun Zhou ◽

Qiu Li Zhang ◽

Xin Zhe Lan ◽

Xi Cheng Zhao

Keyword(s):

Research Method ◽

Low Rank ◽

Low Rank Coal ◽

Pyrolysis Products ◽

Microwave Pyrolysis ◽

Contrastive Study ◽

Peak Intensity ◽

Liquid Products ◽

Light Oil ◽

New Research

The microwave pyrolysis is a new research method for deeply processing of coal. This paper researched the microwave pyrolysis products of low rank coal under N2 and non-N2 atmosphere. The results showed that, compared with non-N2 atmosphere, the yield of liquid products increased by 4.65%, while the yield of solid bluecoke decreased by 2.95% under N2 atmosphere. The infrared characteristics absorption peak intensity of bluecoke obtained from N2 pyrolysis atmosphere was weaker; N2 contributed to the transformation of heavy oil into light oil.

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