Side Firing In-and-Out Furnaces

With thick loads, the pieces should be on piers with high-velocity burners located in rows near the bottoms of both sidewalls, alternating on 4-ft (1.22 m) centers. With this arrangement, flues can be in the roof. One important point In batch operations, do not pass the poc gases of any zone through another zone because that will result in loss of temperature control for the second zone. 

Burners should have capacity for 60 000 to 125 000 Btu/ft hr hearth, preferably about 75 000 Btu/ft hr. A heating curve is preferred to select a firing rate accurately. 

Side firing in-and-ouf furnaces is more difficult because generally one long wall is a door or row of doors, which makes it difficult to measure temperature, increases heat losses, and prevents use of burners on the door wall. However, if the temperature uniformity requirements for the product are not stringent, the burners can be located in the back wall firing foward the doors with control thermocouples inserted through the roof. 

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Fig. 6.1. Side-fired in-and-out furnace (with car-hearth), 18 wide x 12 deep x 8 high iD. Adjustabie fiame burners give uniform heating width-wise/depth-wise double-stacked piers help bottom uniformity. (See also figs. 3.26 and 6.23.)...

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