Walking beam reheat furnaces

Cameras observe slabs or billets as they are set on "walking beams" to be moved through reheat furnaces. They also monitor the center of the furnaces for proper distance between slabs and to be sure slabs are held properly before they are lifted from the furnace and placed on the rolling or forge line. In these applications, a lens with a forward-oblique 45° direction of view often furnishes a useful perspective as it views the material within the furnace (see Figure 16.9). 

Typical furnace camera coverage of walking beam furnace in steel industry. ("High-Temperature Furnace Camera Systems/ Lenox Application Solutions in the Steel Industry (reference sheets with diagrams for reheat furnaces, vacuum degas-sers, remelt/reverberatory furnaces).)... 

The so-called accordion effect upsets the supposedly steady pattern of temperature progression as load pieces move through the zones of multizone reheat furnaces, whether rotary, pusher, walking beam, or walking hearth. (See chap. 6.)... 

Refractory Heat Loss Sample Problem 8.1—Required Fuel Inputs. An added aspect of sample problem 8.1 (the same continuous walking beam steel reheat furnace) calculate the required gross heat input to each zone. (See worksheet tables 8.14 to 8.17.). 

In furnaces with bottom zones, such as pusher or walking beam steel reheat furnaces, each skid rail, on which the loads rest or slide, consists of a schedule 160 pipe, 6.625" (0.1683 m) OD with 0.718" (18.24 mm) wall thickness, through which cooling water is circulated. A solid skid wear bar is securely welded onto the top surface of the pipe. The skid wear bars are often small diameter bars of heat-resisting, wear-resisting material. Their small diameter allows less contact area with the load pieces, thereby minimizing heat loss from the loads. 

Marino, P Numerical Modelling of Steel Tube Reheating in Walking Beam Fnmaces. Proceedings of 5th Enropean Conference on Industrial Furnaces and Boilers, Volume II, INFUB, Portugal, 2000. 

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