The thermal-chemical aspect of the new ironmaking process, which is based on high furnace temperature, tall pellet bed and high volatile coals to reduce ore/coal pellet in a hearth furnace, are independent of the shape, movement and hearth size. For tall and even pellet beds and a smooth operation, fixed retaining walls must be built at the edges of the hearth. Therefore, hot DRI cannot be discharged on the side of the hearth. The discharge of the very hot DRI is limited to the forward direction of the movement of the hearth in a continuous reactor. Compared with the rotary version, this is because a straight hearth furnace is easier to build and be operated. The PSH furnace is proposed as an example.
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