Development of the technology of injecting pulverized-coal fuel into the blast furnace (Analysis of world practice for the period 1993–1997)

Nozdrachev, V. A.; Formoso, A.; Babich, Alexander; Yaroshevskii, S. L.; García, L.

doi:10.1007/bf02511804

Cited by 2 publications

(1 citation statement)

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“…6) On the other hand, it seems highly likely that more emission of un-burnt char under higher PCR conditions should yield higher degrees of fine holdup at the lower part of the furnace, which results in more fine trapped on the deadman surface or at roots of the cohesive zone and then causes increased pressure losses. Consequently, techniques such as Double Lance Injection, 7) Excentric Double Lance, 8) Oxycoal Lance, 9) Coal Preheating, 10) and Co-axial Lances, 11) etc., have been developed or been under development for better coal combustibility. Another viewpoint mainly remarked by Kobe Steel is that the emitted un-burnt char prior to bed coke be gasified by the solution loss reaction and be fully utilized to replace lump coke.…”

Section: Introductionmentioning

confidence: 99%

Combustion Behaviors of Fine Coal and Its Impact on Gas Permeability at Lower Part of Blast Furnace under High Pulverized Coal Rate Operation

Nozawa¹,

Kasai²,

Matsui³

et al. 2011

ISIJ Int.

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Practical ways of estimating temperatures of coke flowing into raceway as well as the gas core depth validated by direct measurement were suggested for the purpose of better describing the combustion behaviors of injected coal fine in blast furnace raceway. The numerical simulation model was refurnished with the scheme, and helped clarifying an intriguing effect of coal gasification or decomposition degrees before exiting tuyere tip on attained combustibility of coal at raceway boundary.Another scheme for quantitative expression of pressure losses caused exclusively by coal fine residence in and around raceway was also developed by shutting off coal injection for minutes at practical operation. The obtained results lead to developing the advanced tuyere, CD (converged and diverged) tuyere which enabled reducing the interaction between injectants and hot blast inside tuyere and thus improving overall gas permeability even under conditions of massive coal injection over 250 kg/tHM.

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Section: Introductionmentioning

confidence: 99%