One way to do this is by using an open hearth furnace,where pig iron and scrap steel are heated. 炼钢的一种方法是将生铁和废钢放在平炉内加热。
The fuel burner of an open - hearth furnace is water - cool, as is the valve that regulates the flow of air and waste gases. 平炉的燃料燃烧室是用水冷却的,控制空气和废气的阀也是水冷的。