試験高炉における還元ガス吹込みについて

概要

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The effect of reducing gas injection on the coke rate and coke to oil replacement ratio was investigated in an experimental furnace of 3.2m^3 inner volume under conditions similar to a commercial furnace. Reducing gas made by partial combustion of oil with oxygen was injected at a constant blast volume. (1) The 571 kg/tHM of coke rate in the standard process decreased to 374 kg/tHM with 628 Nm^3/tHM of gas injection. The replacement ratio was between 0.75 and 0.82 depending on the amount of injected gas. (2) An appropriate amount of injection of reducing gas together with oxygen enrichment improved heat exchange condition at the furnace shaft to increase productivity without any increase in coke rate. (3) 85 percent of oxygen of ore was removed by CO and H_2 with 628Nm^3/tHM of injected gas in comparison with 65% in the standard process. Ore reduced in the same retention time increased by two times by this gas injection. (4) By considering the staged heat balance, it was shown that the gas should contain less CO_2 and H_2O and had to be heated above 1000℃. The gas should be injected at below the thermal reserve zone. (5) The economy of the technipue depended on the prices of coke and gas, and the replacement ratio. Even at present, this technipue has been proved to be economical.
社団法人日本鉄鋼協会の論文
1972-04-01