T. Ariyama et al., COMBUSTION BEHAVIOR OF PULVERIZED COAL IN TUYERE ZONE OF BLAST-FURNACE AND INFLUENCE OF INJECTION LANCE ARRANGEMENT ON COMBUSTIBILITY, ISIJ international, 34(6), 1994, pp. 476-483
Hot model experiments on pulverized coal injection were carried out to
understand the combustion mechanism of pulverized coal injected into
the blast furnace. The combustion behavior of the pulverized coal was
directly observed by a high speed camera, and the temperature distribu
tion of combustion flame was analyzed by an image processor. According
to the results, the combustion flame was not uniform across the cross
section of the blow pipe and tuyere, and the fluctuation of the flame
was observed. Then, it was found that the dispersion of the pulverize
d coal had a great role on combustibility owing to the rapid consumpti
on of oxygen by the combustion of volatile matter. Moreover, it was co
nfirmed that the arrangement of injection lance influenced on the comb
ustion efficiency, since the dispersion of coal particles was enhanced
by the double lance arrangement. On the basis of the above results, t
he dispersion of coal particles was analyzed by the calculation of the
average distance of individual coal particles to easily evaluate the
effect of the injection lance on combustibility.