论文部分内容阅读
目前电弧炉排烟装置的结构可分两大类:一类是“内吸”式(即炉顶直接抽烟法);另一类是“外吸式”(即在炉盖、炉门上装有各种型式的排烟罩:如炉顶全密闭抽烟罩、炉顶侧吸式抽烟罩、吹吸式等)“内吸”式的主要缺点是:①烟气温度高、排烟口温度长期在1000℃以上。为了使烟气能适应袋式除尘器,从炉顶上出来的管道应全部作成双层,中间用水冷却。另外除尘器前还要有一个较大的冷却器,平均每炼一吨钢需耗冷却水25—40吨。②管道伸入炉盖内,不仅容易烧损,而且当排风机开动时,即使风速取得较低,仍有不少的氧化物与细渣吸入管内,再加上内管长期在高温下工作,因此管道腐蚀磨损严重。③冶炼进入还原期时,因炉内要保持高温,须关闭排风机,如加碳粉还原
At present, the structure of electric arc furnace smoke extraction device can be divided into two categories: one is “suction” type (ie, the top direct smoking method); the other is “suction type” (ie, Various types of exhaust hood: such as the roof fully enclosed smoking hood, roof side suction hood, blowing suction, etc.) “suction” type of the main drawbacks are: ① flue gas temperature, exhaust port temperature long Above 1000 ℃. In order to adapt the flue gas to the baghouse, the pipes coming out of the top of the furnace should all be double-layered with water cooling in the middle. In addition, there must be a larger cooler in front of the precipitator, which consumes 25-40 tons of cooling water on an average of one tonne of steel. ② The pipe extends into the furnace cover, not only easy to burn, but also when the exhaust fan starts, even if the wind speed is lower, there are still a lot of oxides and fine slag inhaled pipe, together with long-term internal pipe work at high temperature, Corrosion of pipe corrosion so serious. ③ smelting into the reduction period, because the furnace to maintain high temperature, to be closed exhaust fan, such as adding toner reduction