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青岛市车辆制造厂在0.5吨碱性侧吹转炉上进行了预热鼓风强化冶炼的试验,效果很好,克服了小转炉散热快、出钢温度较难控制的缺陷。目前已在全市许多转炉上开始推广。该厂采用的热风炉是经修改后的“八九”式管式热风炉,有效热交换面积为75平方米,炉条面积为720毫米×2300毫米=1.65平方米,耗煤量为0.79～0.92吨/平方米·昼夜。根据测定,风温一般在300～400℃,最高达432℃。转炉用42立方米/分的罗茨式鼓风机一台,电动机功率为55瓩。为了克服热风管道阻力的增加,把风机转速由480转/分增加到600转/分。热风转炉必须考虑空心耳轴受热后的机械强度和变形,以及轴承润滑等问题。目前该厂采用的耳轴装置如图1。采用这种装置后,炉体只能在280度范围内运转,对烘炉等操作有一定的妨碍。为了避免这个缺点,可以考虑用绝热的办法解决,如图2。
Qingdao vehicle factory in 0.5 tons of alkaline side blowing converter preheat blasting smelting test, the effect is very good, to overcome the small converter fast cooling, tapping temperature difficult to control the defect. At present, many converters in the city have started to promote. The stove used by the plant is a modified “89” type tubular stove, effective heat exchange area of 75 square meters, the furnace area of 720 mm × 2300 mm = 1.65 square meters, the amount of coal consumption is 0.79 ~ 0.92 tons / square meter · day and night According to the determination, the air temperature is generally 300 ~ 400 ℃, up to 432 ℃. Converter with 42 cubic meters / min Roots blower, a motor power of 55 瓩. In order to overcome the increase of hot air pipe resistance, the fan speed increased from 480 rev / min to 600 rev / min. Hot air converter must consider the hollow trunnion heated mechanical strength and deformation, and bearing lubrication and other issues. At present, the trunnion device used in the factory is shown in Fig.1. With this device, the furnace can only operate in the range of 280 degrees, the baking oven and other operations have some obstacles. In order to avoid this shortcoming, you can consider using adiabatic solution, as shown in Figure 2.