未燃チャーの挙動に基づく高炉への微粉炭吹込み限界量の検討(微粉炭吹込み)(<特集>製銑)

概要

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Experiments concerning the combustion and consumption of pulverized coal (PC) with high volatile matter content were conducted using an experimental apparatus capable of simulating the heat transfer and reaction in the lower part of the blast furnace. First, the calculating method of PC combustion efficiency in the raceway was proposed and the effects of blast conditions on the efficiency were investigated. Secondly, the calculating method of PC consumption efficiency at the apparatus top was proposed and the effects of blast conditions on the efficiency were investigated. Thirdly, the unburnt char weight accumulating in the apparatus was measured and the limited char weight not to cause the permeability deterioration in the apparatus was found. As a result of these analyses, the following conclusion was obtained concerning the maximum PC injection rate : Under the conditions of blast temperature of 1300℃, blast humidity of 5×10^<-3>kg/Nm^3 and oxygen enrichment of 2%, the limited PC injection rate is 245×10^<-3>kg/Nm^3 in the apparatus that prevents the discharge of char from the apparatus top, and the limited PC injection rate is 190×10^<-3>kg/Nm^3 that does not cause the permeability deterioration even when char accumulates in the apparatus.
社団法人日本鉄鋼協会の論文
1992-07-01