The DR furnace is a steel vessel with an internal refractory lining in the reducing zone.
直接还原炉是一种钢制容器，在其还原带内具有耐火材料做的炉衬。
2
The shell of the trolley type resistance furnace is cylindrical, and the inside is a vertical shaft furnace made of refractory bricks.
台车式电阻炉的外壳呈圆筒状，内部是由耐火砖砌成的竖井式炉膛，所以台车式电阻炉因此而得名。
3
Bogie hearth resistance furnace bearing and susceptible to collision parts with high strength refractory brick masonry, and the use of water glass during building the mud, so the strength increase.