Rotary kilns are commonly used to heat aggregate materials from lime and cement to soil, stone, fertiliser and various minerals. Most rotary kilns are direct fired, with a flame shooting into the kiln from the discharge end (the fire wall).
Some products, like cement for example, tend to clump during processing. Because the large clumps of materials retain their heat, these so-called clinkers pose a thermal hazard. Conveyors often have a 200°C upper temperature limit, for example.
The Williamson sensor is installed above the conveyor belt to view the product as it passes underneath. The sensor is used to trigger an alarm or to trigger active cooling of the product on the belt. The Williamson product is unique in three critical areas. The Williamson hot spot detector views a large area allowing it to cover the entire width of the belt. The Williamson product includes a rate-of-rise alarm, which allows it to identify hot product without regard for the bulk temperature of the measured area. Finally, the sensor is able to view through heavy steam without interference.
For more information contact Andy Brown, Temperature Controls, +27 (0) 11 791 6000, [email protected]
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