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1990年12月，新日铁君津2号高炉喷煤系统建成并投入运行。虽然喷煤后节约了然比，导致减少炼焦能耗约0．921GJ／t铁，但因风口前煤粉分解吸热，造成火焰温度下降。由此提出了增高风湿的要求，希望热风温度从原有的1000℃上升至1100℃。君津2号高炉热风炉是座已有23年历史的老炉
December 1990, Nippon Steel Junjin No. 2 blast furnace coal injection system was completed and put into operation. Although the ratio of coal is saved, the energy consumption of coking is reduced by about 0.921GJ / t. However, due to the decomposition of the pulverized coal before the tuyere, the temperature of the flame drops. This raised the rheumatism requirements, hoping hot air temperature from the original 1000 ℃ to 1100 ℃. Kim Jun blast furnace blast furnace No. 2 is the seat has been 23-year-old furnace