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Hot air (150°C) can be recovered from the cooling zone to feed the kiln burners, providing fuel savings in the order of 6%. All combustion air piping is insulated and incorporated within the structure. In the slow cooling zone, the micro-blowers used on previous versions have been replaced by an indirect heat exchange zone with heat exchange piping. In final blowing, numerical computer simulation has been used to identify the most efficient hole diameters, pipe center-to-centers, and pipe diameters.
A new final extraction hood geometry has been developed and assessed the same way; unlike previous versions, the new hoods result in a more homogeneous thermal profile and lower outgoing piece temperatures. The goal was to use the two-channel kiln as the “sum” of two separate -- and separately manageable – machines. To this end, the intermediate roof has been built using a new construction technique that employs a greater number of silicon carbide bars than other machines on the market, thus allowing temperature differences between one channel and the other as high as 450°C.
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