Experimental Research of Biomass Pyrolysis Characteristics at Low Temperature

2013 ◽  
Vol 860-863 ◽  
pp. 522-526
Author(s):  
Kai Wang ◽  
Jian Guo Jiang ◽  
Rong Feng Sun
Keyword(s):  
Low Temperature ◽  
Pyrolysis Product ◽  
Corn Stalk ◽  
Cotton Stalk ◽  
Pyrolysis Gas ◽  
Pyrolysis Characteristics ◽  
Heat Value ◽  
On Line ◽  
Low Temperature Pyrolysis ◽  
Better Than

The pyrolysis characteristics for two types biomass material was tested at 230°C~250°C, and the pyrolysis product component was on-line analyzed by using moisture micro-detection teller, gas chromatograph-mass spectrometer computer and fourier transform infrared spectroscopy. Besides, two different algorithms were used to evaluate the test error. In addition, the generated tar gas was secondary decomposed at 800°C. It is found that the tar was broken up completely, which increased the hydrogen content sharply in the pyrolysis gas. The test data shows that the heat value of cotton stalk improves better than that of the corn stalk after pyrolysis, so it is more suitable for cotton stalk than corn stalk to improve the value in use by means of low temperature pyrolysis technology.

Experimental Research of the Fast Pyrolysis Characteristics for Lignite at Medium Temperature

2014 ◽  
Vol 521 ◽  
pp. 654-657
Author(s):  
Kai Wang ◽  
Jian Guo Jiang ◽  
Rong Feng Sun
Keyword(s):  
Fast Pyrolysis ◽  
Pyrolysis Product ◽  
Proximate Analysis ◽  
Fixed Carbon ◽  
Medium Temperature ◽  
Pyrolysis Characteristics ◽  
Heat Value ◽  
On Line ◽  
Higher Temperature ◽  
Gas Component

The lignite fast pyrolysis characteristics at medium temperature was tested ranging from 400°C to 700°C, and the pyrolysis product component was on-line analyzed by using gas chromatograph-mass spectrometer computer and fourier transform infrared spectroscopy. Besides, two different algorithms were used to evaluate the test error. The results show that the maximum experimental error is no more than 6.2%. In addition, the optimum pyrolysis temperature is about 550°C which causes the maximum tar yield with an obvious increases of heat value. The gas component concentration shows divergences because of the tar decomposition at higher temperature. Finally, the proximate analysis of char was tested, which shows that the ash and fixed carbon of char increase with the temperature addition.

scholarly journals Theoretical study and case analysis for a pre-dried pyrolysis coupled lignite-fired power system

2018 ◽  
Author(s):  
Ming Liu ◽  
Rongtang Liu ◽  
Junjie Yan
Keyword(s):  
Low Temperature ◽  
Case Analysis ◽  
Theoretical Models ◽  
Energy System ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Low Rank ◽  
Drying Process ◽  
Heat Value ◽  
Low Temperature Pyrolysis

Lignite, a kind of low rank coal, has the characteristics of high moisture, high volatile, high ash and low heat value. The low-temperature pyrolysis technology is potential to improve the utilization efficiency of lignite. Therefore, a lignite-based energy system integrated with pre-drying and low-temperature pyrolysis was proposed in this paper. To assess the influence of pre-drying process, theoretical models were developed based on thermodynamics, and a case analysis was then performed to get the quantitative effect of pre-drying on efficiency of energy utilization. Results show that pre-drying on PPPS theoretical model can significantly improve the utilization of lignite by 1.46%.Keywords: Lignite; Pre-drying; Low-temperature pyrolysis; Energy efficiency; Case analysis.   

Low Temperature Pyrolysis Characteristics of Oil Sludge under Various Heating Conditions

2007 ◽  
Vol 21 (2) ◽  
pp. 957-962 ◽  
Author(s):  
Zhiqi Wang ◽  
Qingjie Guo ◽  
Xinmin Liu ◽  
Changqing Cao
Keyword(s):  
Low Temperature ◽  
Oil Sludge ◽  
Pyrolysis Characteristics ◽  
Low Temperature Pyrolysis

Low-Temperature Pyrolysis Characteristics of Inner Mongolia Lignite

2013 ◽  
Vol 805-806 ◽  
pp. 1455-1460
Author(s):  
Zhen Xin Zhao ◽  
Bu Wei Ma ◽  
Shu Quan Zhu ◽  
Hai Jin Zheng
Keyword(s):  
Low Temperature ◽  
Inner Mongolia ◽  
Heat Content ◽  
Calorific Value ◽  
Product Yield ◽  
High Heat ◽  
Holding Time ◽  
Low Rank ◽  
Pyrolysis Characteristics ◽  
Low Temperature Pyrolysis

The utilization of high moisture, high volatile low rank coals such as lignite is gaining importance day by day to meet the growing demands of coal for the energy sectors. For the combustion of pulverized material it appears essential to dry lignite. Further, lowest possible ash and moisture as well as high heat content are desired for combustion. The present work gives the details of the preparation of a product of higher calorific value by thermal treatment of Inner Mongolia lignite. The low-temperature pyrolysis characteristics were carried out on the regularities of pyrolysis temperature and holding time on the product yield of dry distillation of lignite by using aluminium retort method. The result shows that the suitable pyrolysis condition of lignite is 450 ~ 510 °C, holding time for 30 min. The ratio of aliphatic and aromatic groups of 400°C semi-coke obviously decrease 53.1% and 11.8% compared with raw coal. The degree of aromatization of semi-coke is gradually increased and aromatic nucleus condensation degree increases. The retort process of lignite is a dehydrogenation, deoxidization and carbon-rich process.

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

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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