Bruks Bed Dryer
The BRUKS Bed drier utilizes a flat steel plate on which the chips are deposited. Flights pull the thick mat of chips down the length of the plate. Shaped holes in the plate allow hot air to enter from below. The hot air rises through the mat, moving the moisture from the bottom to the top of the mat, and into the air above. The mat is about 1 m thick. The top-most later does not dry to the level desired, and is skimmed off by a screw located at the discharge end.
An infrared sensor monitors the top of the skimmed mat to insure that the position of the skimming screw is just right, with respect to the overall moisture content of the mat that remains below. The skimming screw moves up and down, as needed, to control this point. The flights that move the mat are on a variable frequency drive to move the material only in accordance to the overall operating parameters of the dryer, which include the temperature and volume of air available for drying, the temperature and moisture content of the infeed chips, and many other variables.
Recommended heat source: Hot water (or steam), available for the heat exchangers in sufficient volume and temperature to drive the air heating process. BRUKS will specify the estimated
consumption for each unique installation.One of the great advantages of this style of dryer is that the inlet temperature is below the volitization point of many organic compounds. As a consequence, the emission rates are very, very low (below permit levels). Comparable drum dryers use inlet temperatures of more than 500 C, which can be a real VOC problem – they typically need scrubbers or RTO’s to control the VOC’s. Also, the wet top layer of chips traps the particulates as the hot air moves through the mat. Consequently the particulate emission rates are low.
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RP Engineering Dryers
We at Southern Cross have the rights to manufacture a range of small to medium sized dryers as designed by R P Engineering of Italy. We can offer Rotary dryers; conventional or containerized, flash dryers, and low temperature dryers.
The drum dryers are most suited to dry high input – humidity materials with granula sizes from medium to small. They have high reliability and easy to operate. Being Triple pass drums they require little space.
The low temperature dryers utilise heating sources such as hot water, steam or exhaust gases and will suit similar products as above.
The Flash dryers are suited for products that are very small in size. In these dryers the product is in suspension and comes into direct contact with the hot gases.
Whatever the size, heating medium, material to dry may be we at Southern Cross Engineering can help together with our dryer partners; Bruks and RP Engineering.