板坯连铸机结晶器钢液卷渣的水模型研究

A Study of Water Model on Slag Entrapment of Molten Steel in Mould of Slab Continuous Caster

针对安钢超低头板坯连铸机结晶器液面卷渣现象 ,用 0 6∶1 0水模型 ,研究了水口浸入深度 30mm、6 0mm和 110mm时 ,铸坯拉速 1 0～ 0 7m min、水流量 2 6 2 4～ 18 4m3 min范围内水口浸入深度、拉速对结晶器内钢液卷渣程度的影响。提出卷渣指数J =V·h (t·H) ,式中V 拉速 ;h 1 10大波值 ;t 开始卷渣时间 ;H 水口浸入深度。结果得出 ,为防止安钢板坯结晶器液面卷渣 ,当水口浸入深度为 110mm时 ,拉速应≤0 90m min ;浸入深度 6 0mm时 ,拉速应≤ 0 85m min ;J应 <1 37× 10 - 2 mm s2 。

According to slag entrapment phenomenon of molten steel in mould of extra-low head slab continuous caster at Anyang Iron and Steel, the effect of nozzle immersion depth and casting speed on slag entrapment degree of molten steel in mould has been studied by water model in proportion 0.6∶1.0 in conditions of nozzle immersion depth 30, 60 and 110mm, slab casting speed in the range of 1.0～0.7 m/min, and water flow rate 26.24～18.4 m3/min. The concept of slag entrapment index J was advanced: J = V·h/(t·H), where V- casting speed, h- 1/10 large wave value, t- start slag entrapment time and H- nozzle immersion depth. The results obtained that to avoid slag entrapment in mould of slab continuous caster at Anyang, as nozzle immersion depth H was 110 mm, the casting speed should be no more than 0.90 m/min, as H was 60 mm, the casting speed should be no more than 0.85 m/min; and the J should be less than 1.37×10-2.