1 School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710311, Shaanxi, China 2 Technical Center of Shandong Iron and Steel Co., Ltd. (Laiwu Branch), Jinan 271104, Shandong, China
Comparison of semi-coke with traditional pulverized coal injection and iron ore sintering fuels based on chemical structure and combustion behavior
1 School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710311, Shaanxi, China 2 Technical Center of Shandong Iron and Steel Co., Ltd. (Laiwu Branch), Jinan 271104, Shandong, China
摘要 Substantial semi-coke has been produced through the industrialized low-temperature pyrolysis process, which has great potential as an alternative fuel for pulverized coal injection (PCI) and iron ore sintering. X-ray diffraction, Raman spectroscope, and thermal analysis were used to compare the carbon chemical structure and combustion reactivity of semicoke, pulverized coal, and coke breeze. The results show that the average volatile matter content in 46 types of semi-cokes is 8.94 wt.%. The fluctuation range of the characteristic parameters of the semi-coke chemical structure is d002 = (0.352–0.379) nm and AD1/AG = (2.51–7.92), while the fluctuation range of the characteristic parameters of pulverized coal is d002 = (0.348–0.373) nm and AD1/AG = (1.71–9.03) (where d002 means the interlayer spacing between the aromatic planes, and AD1/AG is an index that characterizes the degree of disorder of the char structure through the area ratio of the defect peak band D1 to the perfect graphite peak band G); the overlap between these ranges is relatively high. Contrarily, the fluctuation range of the characteristic parameters of coke breeze is d002 = (0.343–0.350) nm and AD1/ AG = (0.75–2.51), which is markedly different from that of semi-coke. Semi-coke combustion reactivity is close to that of pulverized coal, but considerably better than that of coke breeze. In terms of chemical structure and combustion reactivity, semi-coke can be used as an alternative fuel for PCI; however, when used for sintering alternative fuel, matching of the heat supply and demand in the later sintering stage must be scrupulously analyzed.
Abstract：Substantial semi-coke has been produced through the industrialized low-temperature pyrolysis process, which has great potential as an alternative fuel for pulverized coal injection (PCI) and iron ore sintering. X-ray diffraction, Raman spectroscope, and thermal analysis were used to compare the carbon chemical structure and combustion reactivity of semicoke, pulverized coal, and coke breeze. The results show that the average volatile matter content in 46 types of semi-cokes is 8.94 wt.%. The fluctuation range of the characteristic parameters of the semi-coke chemical structure is d002 = (0.352–0.379) nm and AD1/AG = (2.51–7.92), while the fluctuation range of the characteristic parameters of pulverized coal is d002 = (0.348–0.373) nm and AD1/AG = (1.71–9.03) (where d002 means the interlayer spacing between the aromatic planes, and AD1/AG is an index that characterizes the degree of disorder of the char structure through the area ratio of the defect peak band D1 to the perfect graphite peak band G); the overlap between these ranges is relatively high. Contrarily, the fluctuation range of the characteristic parameters of coke breeze is d002 = (0.343–0.350) nm and AD1/ AG = (0.75–2.51), which is markedly different from that of semi-coke. Semi-coke combustion reactivity is close to that of pulverized coal, but considerably better than that of coke breeze. In terms of chemical structure and combustion reactivity, semi-coke can be used as an alternative fuel for PCI; however, when used for sintering alternative fuel, matching of the heat supply and demand in the later sintering stage must be scrupulously analyzed.
Jiang-yong He,Chong Zou,Jun-xue Zhao, et al. Comparison of semi-coke with traditional pulverized coal injection and iron ore sintering fuels based on chemical structure and combustion behavior[J]. Journal of Iron and Steel Research International, 2022, 29(5): 725-740.
2022, Vol. 29 
