适用于重熔铝锭及废料的高效节能熔铝炉

The aluminium melting furnace of high efficiency for remelting aluminum ingots and scraps

为提高火焰熔铝炉的热效率,分析了目前常用熔铝炉型的工作原理及结构,找出各自的优缺点,指出火焰熔铝炉充分利用高温炉气是提高热效率的主要方法。针对现有火焰炉加热时局部温度过高、传热受限的弊端,设计了可上下调节、左右摆动的高速烧嘴。运用对流传热的牛顿定律,设计了适用于重熔铝锭及废料的加热与预热同时进行的双层膛火焰炉,增加了高温气流与炉料的接触面积,强化了对流传热的作用。新型熔铝炉充分利用了余热预热炉料和助燃空气,使熔铝炉的热效率提高到55%以上。

In order to improve heat efficiency of flame furnaces, the work principle and structure of several common types of aluminum melting furnaces are analyzed, with their ad- vantages and disadvantages pointed out. The results show that making full use of high-tem- perature furnace gas is the main method for flame furnaces to improve thermal efficiency. In view of the heat transfer limitation caused by local high temperature, a kind of high-speed burner is designed, which can be moved to the directions of up, down, left and right. The Newtong law of convective heat transfer is used and the double-chamber flame furnace is de- veloped. It can be used to remelt aluminum ingots and scraps with simultaneous heating and preheating processes. The new method increases the contact area of high-temperature air flow and the furnace charge, intensifies the function of convective heat transfer, and makes the best of afterheat to preheat the furnace charge and combustion-supporting air, so that the ther- mal efficiency grows up to over 55 % for aluminum melting furnaces.