第一种:日本NKK开发的三段预热炉的预热装置: 其流程是:从电炉第四孔排出的高温烟气首先进入燃烧室,在此室中,烟气中的一氧化碳进一步燃烧,然后流入三只搁置在小车上、并互为串联的预热炉中,并把热量传递给放在预热炉内的废钢料篮中的废钢、最后烟气通过布袋除尘 The first: Japan NKK developed three preheating furnace preheating device: The flow is: the fourth hole from the furnace hot flue gas first discharged into the combustion chamber, in this chamber, the flue gas of carbon monoxide further combustion, It then flows into three preheated furnaces which rest on the cart and are connected in series with each other and transfer the heat to the scrap placed in the scrap baskets in the preheating furnace,