Car bottom furnace max. 1 315 °C

gas

Batch furnaces are fired with either gaseous or liquid fuel, with preheated or cold air for combustion. The air may be preheated by either regenerators or recuperators. When the air is preheated by regenerators, the furnace fires reversed from one end to the other. If the air is preheated by recuperators, they are not reversed and firing is continuous from one or both ends, depending upon the location of the gas outlet port. The steel to be heated in a batch furnace is commonly charged and drawn through front doors by a charging machine. Batch furnaces vary in size from those with hearths of less than a square metre (only a few square feet), with a single access door, to those about 6 metres (20 feet) in depth by 15 metres (50 feet) long, with five or six doors.