Effects of CO2 and H2O on coal pyrolysis with the ultrafast heating rate in a concentrating photothermal reactor

The pyrolysis tests of Shenhua coal and Shenhua direct liquefaction residue have been carried out using thermogravimetric at the differential heating rate. The kinetic parameters k and E were calculated using DAEM method. Results show DAME model can describe the pyrolysis behavior of Shenhua coal within the range of 20% to 95%, the activation energy of coal pyrolysis ranges from 53.98 to 279.38 kJ/mol, and DAME model can describe the behavior of Shenhua direct liquefaction residue within the range of 10% to 80%, the activation energy of residue pyrolysis is about 170 kJ/mol. The results of which are basically consistent with the experimental data.

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Pyrolysis Characteristics and Kinetics of Low Rank Coal

Materials Science Forum ◽

10.4028/www.scientific.net/msf.695.493 ◽

2011 ◽

Vol 695 ◽

pp. 493-496 ◽

Cited By ~ 2

Author(s):

Yong Hui Song ◽

Jian Mei She ◽

Xin Zhe Lan ◽

Jun Zhou

Keyword(s):

Weight Loss ◽

Heating Rate ◽

Frequency Factor ◽

Low Rank ◽

Coal Pyrolysis ◽

Pyrolysis Characteristics ◽

Second Stage ◽

Thermo Gravimetric Analyzer ◽

Kinetics Of ◽

Pyrolysis Kinetic

The pyrolysis characteristics of Jianfanggou(JFG) coal was studied using a thermo-gravimetric analyzer and the pyrolysis kinetic parameters were calculated at the different heating rate. The results showed the DTG curves under different heating rate had three peaks and the corresponding temperature were 100°C, 470°C and 750°C, the pyrolysis process can be divided into three stages conclusively. The maximum weight loss rate at 470°C indicated the major weight loss occurred in the second stage. The Tb, Tf and T∞ obtained under experiment situation. The results of the JFG coal pyrolysis kinetic showed the Tb, Tf and T∞ increased gradually with the accretion of the heating rate. In the meantime, the variation of frequency factor was consistent with the trend of activation energy.

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The Effect of Additive on Temperature Rising Characteristics during Coal Pyrolysis in Microwave Field

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.512-515.1790 ◽

2012 ◽

Vol 512-515 ◽

pp. 1790-1794

Author(s):

Quanrun Liu ◽

Hao Xia

Keyword(s):

Heating Rate ◽

Microwave Field ◽

Pyrolysis Temperature ◽

Coal Pyrolysis ◽

Final Temperature ◽

Absorbing Material ◽

Microwave Absorbing ◽

Rapid Pyrolysis

The pesent paper decribed the effects of additive on temperature rising characteristic during coal pyrolysis at different temperature in microwave field. Different mixture rate of carboncoal with coal and different final temperature on coal pyrolysis tempereature rising characteristics were studied in the work. The results indicate: Coal is a poorly microwave absorbing material, and its pyrolysis in microwave field need to add a certain amount of microwave absorbent for higher heating rate; Because carbocoal can be fast heated in microwave field, so it can be used as additive for coal pyrolysis. Carbocoal otained from different pyrolysis temperature have different heating rate, along with the increase of carbocoal pyrolysis temperature, carbocoal heating rate increases in microwave field. Using charcoal as microwave absorbent for coal rapid pyrolysis in microwave field is feasible.

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