Continuous furnace with conveyor

For the same reason, the placement of samples in the electric furnace requires careful consideration. Figure 8-20 shows the flow of gas in a continuous furnace with a conveyor of the type frequently used for firing LTCCs. In a continuous furnace with a conveyor there are some ten heater... 

Figure 8-20 Flow of gas in a continuous furnace with a conveyor.

Continuous production ol charcoal is typically performed in multiple hearth furnaces, as illustrated in the Herreshoff patent shown in Figure 2. Raw material is carried by a screw conveyor to the uppermost of a series of hearths, /kir is supplied counter-currently and burns some of the wood to supply process heat. As the layers of wood carbonize, they are transported to the lower (hotter) hearths by rakes. The hot charcoal product is discharged onto a conveyor belt and cooled with a water spray. 

Fig. 1.5. Continuous belt-conveyor type heat treat furnace (1800 F, 982 C maximum). Except for very short lengths with very lightweight loads, a belt needs underside supports that are nonabrasive and heat resistant—in this case, thirteen rows, five wide of vertical 4 in. (100 mm) Series 304 stainless-steel capped pipes, between the burners of zones 2 and 4. An unfired cooling one Is to the right of zone 3.

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