Abstract
Direct evaluation of the combustibility of pulverized coals in ironmaking blast furnace pulverized coal injection (PCI) is difficult. A pilot-scale PCI rig may be used to test the combustion performance of a PCI coal. However, the replication of the conditions in the blowpipe–tuyere–raceway region is complicated and costly. Drop-tube furnaces (DTFs), which have been widely used in coal combustion research, are seen as an alternative to such combustion tests. This study therefore compares coal combustion performances in a DTF and a PCI rig, where the coal is burned at the as-ground size distribution to assess the suitability of a DTF to replace a PCI rig. In addition, this study tries to establish the methodology for ranking the PCI coal combustion performance through coal burnouts produced in the DTF. The measured burnouts from both the DTF and the pilot-scale PCI rig produced a linear relationship against the coal volatile matter (VM) content, although the trend of the DTF burnouts have a steeper slope. ...
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