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Raising pulverized coal injection (PCI) will decrease coke rate, but increase   the residence time of coke and abrasion in the blast furnace (BF). Thus,   insufficient coke strength will generate more coke fines in the lower BF and   result in lower permeability and production of hot metal (HM). For   understanding the behavior of coke at various HM productivities, a tuyere   coke sampler was used to collect the coke samples for measuring the coke   strength. Firstly, the difference of sampled coke under the conditions of   various HM productivities was explored. Secondly, the BF operating conditions   and causes of generating more coke fines was correlated by testing the coke   reaction rate after reaction. Finally, according to the above analysis   results, the relative regression equations had been obtained for sampling   coke properties, BF operation conditions and BF permeability. Furthermore,   the coke strength after reaction (CSR) quantitative target and its online   system at various blast conditions were set to provide some reference for   coke and HM production

Results of tuyere coke sampling with regard to application of appropriate coke strength after reaction (CSR) for a blast furnace