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1 问题的提出 本钢4号高炉1992年大修时采用了软水密闭循环冷却工艺,高炉投产3年多来,整个冷却系统运转良好。但由于高炉现场拥挤,无法安装脱气罐,只好采用手动方式对软水系统进行人工定期排气。由于排气效果不理想,使得管网中存在着大量气体和溶解氧,冷却系统实际水量相应减少,换热率明显下降。当含有气体和溶解氧的软水通过冷却壁的薄弱部位时,这些部位极易产生过热进而被烧坏。当管网中的气体进入泵体高压区及阀门等局部区域时产生“气塞”,溶解氧还会使这
1 PROBLEM PROBLEM BONDS BF 4 adopted a soft-water closed-cycle cooling process when it was overhaul in 1992. After the blast furnace was put into operation for more than three years, the whole cooling system was operating well. However, due to crowded blast furnace site, can not be installed degassing tank, had to manually manual soft water system for artificial exhaust regularly. Due to the unsatisfactory exhaust effect, there is a large amount of gas and dissolved oxygen in the pipe network, and the actual water volume of the cooling system is correspondingly reduced, and the heat exchange rate is obviously decreased. When soft gas containing gas and dissolved oxygen passes through the weakened area of the cooling wall, these areas can easily overheat and burn out. When the gas in the pipe network into the high pressure area of the pump and valves and other local areas have a “gas plug”, dissolved oxygen will make this