scholarly journals Enhanced Combustion of Bituminous Coal and Semicoke Mixture by Ferric Oxide with Thermographic and Kinetic Analyses

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7696
Author(s):  
Tingting Lv ◽  
Luyao Kou ◽  
Tu Hu ◽  
Libo Zhang ◽  
Li Yang

We study the specific catalytic effect of the catalyst on the combustion process of pulverized coal of increasing the proportion of semicoke in the mixture of semicoke and bituminous coal, and reducing the cost of blast-furnace coal injection. A combination of thermogravimetric and kinetic analyses were used to study the catalytic effect of Fe2O3 on semicoke and bituminous coal, and to improve the amount of semicoke in the mixed coal powder of bituminous coal and semicoke. Experimental results showed that Fe2O3 had a catalytic effect on both semicoke and bituminous coal, but there were differences in the catalytic stages of the same catalyst for different pulverized coal types. The addition of 2 wt % Fe2O3 to semicoke and bituminous coal each led to the ignition temperature and maximal burning rate temperature of the semicoke decreasing, indicating that the catalyst promoted the precipitation of a volatile fraction from the semicoke. The maximal burning rate temperature and burnout temperature of the bituminous coal decreased, and maximal weight loss rate increased, indicating that the catalyst promoted the combustion of the fixed carbon of bituminous coal. The optimal proportioning amount of semicoke in the mixed coal powder without the addition of a catalyst was 25%. After adding 2 wt % Fe2O3, the proportional amount of semicoke increased by 10%. The addition of the catalyst resulted in even lower activation energy for the same conversion rate. When the conversion rate was in the ranges of 0.1–0.2 and 0.5–0.7, the activation energy decreased by 22% and 26%, respectively, compared with that without a catalyst. Fe2O3 promoted the combustion of bituminous coal and semicoke. This enhanced the combustion performance of the pulverized coal mix and increased the proportion of semicoke in the mix, which has certain guiding significance in reducing the cost of blast-furnace iron making.

2019 ◽  
Vol 38 (2019) ◽  
pp. 733-738
Author(s):  
Yi-fan Chai ◽  
Guo-ping Luo ◽  
Sheng-li An ◽  
Jun Peng ◽  
Yi-ci Wang

AbstractIn order to explore the influence of unburned pulverized coal on gasification reaction of coke in blast furnace, kinetic rules of gasification reaction between CO2 and coke powder adding pulverized coals with different volatiles were studied by thermogravimetric analysis. The results showed that weight-loss ratio of samples reacted with CO2 increased after adding pulverized coal, and the weight-loss ratio rose with the increase of coal’s addition. When the content of pulverized coal was up to 50%, the weight-loss ratio of the sample which adding pulverized coal with high volatile was higher under the same temperature. The activation energy about C-CO2 gasification reaction of samples reduced observably after adding pulverized coal. The activation energy of samples had a largest decrease with 83.408 kJ mol−1 at the range of 1223 K~1373 K and it was 28.97 kJ mol−1 at the range of 1373 K~1523 K. The addition of pulverized coal with high volatile can reduce the reaction activation energy of samples more effectively. In the soft melting zone, the gasification reaction model of coke blocks attached the unburned pulverized coal was up to unreacted core model and porous volume-reacted model jointly.


2013 ◽  
Vol 303-306 ◽  
pp. 2577-2580
Author(s):  
Chun Yan Song ◽  
Yong Liang Gui ◽  
Bin Sheng Hu

The dynamic characteristic parameter of conveying property of pulverized coal is described with the conveying mass of pulverized coal in unit time. The conveying process of pulverized coal is studied by means of the pulverized coal’s conveying property testing equipment developed by ourselves. Results show that the conveying property of bituminous coal is better than anthracitic coal. If the improvement of conveying property of pulverized coal is considered purely, the size of pulverized coal can properly be reduced and the proportion of anthracitic coal can properly be decreased. The water content of pulverized coal can be controlled from 1% to 2%.


2020 ◽  
Vol 47 (3) ◽  
pp. 228-237
Author(s):  
Yanjiang Li ◽  
Jianliang Zhang ◽  
Guangwei Wang ◽  
Wang Liang ◽  
Nan Zhang ◽  
...  

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