Comparative Study on Microwave Co-Pyrolysis Products of Low Rank Coal in CO2 and N2 Atmosphere

2014 ◽  
Vol 1033-1034 ◽  
pp. 142-145
Author(s):  
Jun Zhou ◽  
Zhe Yang ◽  
Wen Zhi Shang ◽  
Qiu Li Zhang ◽  
Yong Hui Song ◽  
...  
Keyword(s):  
Comparative Study ◽  
Functional Groups ◽  
Low Rank ◽  
Gas Chromatography Mass Spectrometry ◽  
Lower Content ◽  
Low Rank Coal ◽  
Fixed Carbon ◽  
Pyrolysis Products ◽  
Liquid Products ◽  
New Research

Microwave pyrolysis of coal is a new research method for deeply processing of low rank coal. This paper conducted comparative study on microwave co-pyrolysis products of low rank coal in CO2 and N2 atmosphere. The composition and content of tar and bluecoke were analyzed by gas chromatography-mass spectrometry and FTIR spectroscopy. The results showed that the yields of liquid products in CO2 and N2 atmosphere were 20.6% and 18.0% respectively, and the yields of bluecoke were 62.0% and 65.8%. Bluecoke obtained from CO2 pyrolysis atmosphere had the lower content of fixed carbon and oxygenic functional groups, but the higher content of volatile. There was the lower content of aromatic hydrocarbons and the higher content of oxygenic functional groups in the tar produced in CO2 pyrolysis atmosphere due to CO2 gasification effect.

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

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.

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%.

scholarly journals Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 759
Author(s):  
Ivan Kojić ◽  
Achim Bechtel ◽  
Nikoleta Aleksić ◽  
Dragana Životić ◽  
Snežana Trifunović ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
Plastic Material ◽  
Isotope Analysis ◽  
Synergetic Effect ◽  
High Density ◽  
Low Rank ◽  
Gas Chromatography Mass Spectrometry ◽  
Low Rank Coal ◽  
Simultaneous Treatment ◽  
Pyrolysis Products

The mutual impact of low-quality lignite and high-density polyethylene (HDPE) during open system pyrolysis was investigated, aiming to improve utilization of lignite with simultaneous treatment of HDPE waste. Pyrolysis of lignite, HDPE, and their mixture (mass ratio, 1:1) was performed at temperatures 400, 450, 500, 550, and 600 °C. Initial substrates and pyrolysis products were characterized by thermogravimetric analysis (TGA), gas chromatography–mass spectrometry (GC–MS), specific carbon isotope analysis of individual hydrocarbons (δ13C), Rock-Eval pyrolysis, and elemental analysis. The positive synergetic effect during co-pyrolysis of lignite/HDPE mixture was observed at temperatures ≥450 °C, with the greatest being at 500 °C. The highest yield of liquid co-pyrolysis products with a similar composition to that of crude oils is also noticed at 500 °C. The yields of liquid and gaseous products and quality of pyrolytic products obtained by co-pyrolysis of lignite/HDPE mixture are notably improved compared with pyrolysis of lignite alone. On the other hand, data obtained from pyrolysis of HDPE alone indicate that it cannot be concurrent to well-developed catalytic thermal processes for polymer recycling. However, concerning the huge amount of produced HDPE, at least part of this plastic material can be reused for advanced thermal treatment of lignite, particularly in countries where this low-rank coal represents the main source of energy.

Experimental Study on Low-Temperature Carbonization of Low Rank Coal

2013 ◽  
Vol 805-806 ◽  
pp. 1311-1316
Author(s):  
Li Qun Wang ◽  
Zhong Xiang Wei ◽  
Zhong Bo Yi
Keyword(s):  
Experimental Study ◽  
Ash Content ◽  
Carbonization Temperature ◽  
Holding Time ◽  
Low Rank ◽  
Volatile Content ◽  
Low Rank Coal ◽  
Fixed Carbon ◽  
Dry Distillation ◽  
Increasing Trend

In this paper,a research was carried out on the regularities of carbonization temperature,holding time and mass on weightlessness of low rank coal. The experiment showed experiments in a certern range (450°C~700°C,<60min),weightlessness of coal in an increasing trend,the remained volatile content of semi-coke was measured reduce tending to value,ash content increased,fixed carbon gradually increased in the temperature range with the improvement of the carbonization temperature and holding time,also hydrogen and oxygen content of the char decreased,a significant increased in the carbon content,nitrogen and sulfur content was essentially the same. Reactivity of CO2 and semi-coke obtained in different carbonization conditions were better,the response rates are 100% when the temperature exceeded 1000°C. Best condition of dry distillation: carbonization temperature was 500°C~650°C,mass of low rank coal was less than 30g,holding time was between 30 minutes to 40 minutes.

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 Study on Chemical Bond Dissociation and the Removal of Oxygen-Containing Functional Groups of Low-Rank Coal during Hydrothermal Carbonization: DFT Calculations

ACS Omega ◽  
2021 ◽  
Vol 6 (39) ◽  
pp. 25772-25781
Author(s):  
Han Dang ◽  
Guangwei Wang ◽  
Chunmei Yu ◽  
Xiaojun Ning ◽  
Jianliang Zhang ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Chemical Bond ◽  
Functional Groups ◽  
Hydrothermal Carbonization ◽  
Low Rank ◽  
Low Rank Coal ◽  
Bond Dissociation

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.

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