|
|
|
| Fundamental of explosibility of pulverized coal injection and suppressed measures |
| GAO Qiang-jian，HE Yun-feng，LIU Zhao，YANG Fu-cai |
| （School of Metallurgy， Northeastern University， Shenyang 110819， Liaoning， China） |
|
|
|
|
Abstract The explosibility of pulverized coal injection （PCI） is a main concern for metallurgical industry enterprises. The main factors which affect the explosibility of pulverized coal in PCI process were studied. Additionally，the effective measures for suppressing explosive of PCI were proposed. It has been found that the reasonable blended proportion of bituminous coal and anthracite can be utilized to adjust the explosibility of the coals. With the increasing of the proportion of anthracite，the explosibility of PCI decreases gradually. Therefore，the proper proportion of blended coals between the bituminous coal and anthracite should be determined based on ensuring safe injection and achieving the low-cost of PCI. Physical properties of pulverized coal also play an important role in explosibility. As the volatile matter mass percent increases from 24.63% to 30.65%，the explosibility index（L） of pulverized coal raises nearly three times. Similarly，with the proportion of 0.074 mm for pulverized coal granularity decreases from 100% to 50%，the explosibility also appears decreasingly. Moreover，the explosibility is found to be significantly going up with the increasing of oxygen concentration in atmospher. For instance，a kind of blended coal which has no explosibility in the air shows strong explosibility in the high oxygen concentration atmosphere. Moreover，by adding MgCO3·5H2O in blended coals，the explosibility can be effectively suppressed，the L drops by 61.67% as the portion of additive is 6.0%，which means that MgCO3·5H2O has an advantageous action for suppressed explosibility.
|
|
Received: 03 July 2018
Published: 24 December 2018
|
|
|
|
| [1] |
PENG Zheng-fu, ZHANG Jian-liang, BI Chuan-guang, NING Xiao-jun, TAN Pei-long, WANG Guang-wei. Effect of coke powder and semi-coke on combustion characteristics of blast furnace blended coal[J]. Iron and Steel, 2019, 54(12): 10-18. |
| [2] |
SHAN Liang，LI Zhong-hu，FENG Xiao-dong. Establishment and application of coal gas prediction model based on EMS data[J]. Chinese Journal of Iron and Steel, 2016, 34(3): 6-10. |
| [3] |
XIAO Hong， ZHANG Jian-liang， JIA Feng-juan， PANG Qing-hai，ZHU Guang-yue， ZHENG Chang-le. Coal Blending Optimization for Blast Furnace Pulverized Coal Injection[J]. Iron and Steel, 2014, 49(9): 29-33. |
| [4] |
QU Jun-jie，WU Keng，WANG Chong-mao，FU Ping，ZHAN Wen-long，SHAO Teng-fei. Effect of Pulverized Coal Injection on the Theoretical Flame Temperature Before Tuyere in COREX Melter-Gasifier[J]. Iron and Steel, 2012, 47(6): 14-17. |
| [5] |
ZHANG Jianliang;ZHANG Xidong;CHEN Shanshan;L Wei. Blended Coal Combustion Studied by Thermogravimetry[J]. Chinese Journal of Iron and Steel, 2009, 21(2): 6-0. |
|
|
|
|
2018, Vol. 53 
