Conveyor rake

A typical positive rake angle of a conveyor flight would be 1°. Sometimes this is automatically provided by the design of the tile wear protection. The reasoning behind such a raked flight is that it wilt tend to lift the cake from the bowl and in so doing reduce conveyor torque. Thus, this would not be used on soft cake/low torque applications but more on torque-producing, stiff, cohesive cakes. 

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Special designs of spray dryers may provide for cooling air to enter around the chamber, closed systems for the recoveiy of solvents, and air sweepers or mechanical rakes to remove dry product from the walls and bottom of the chamber. Some are followed by pneumatic conveyors as depicted in Fig. 12-101, in which drying air is diluted with cool air for product cooling before separation. Spray dryers may... 

Continuous Percolators Coarse sohds are also leached by percolation in moving-bed equipment, including single-deck and nmlti-deck rake classifiers, bucket-elevator contactors, and horizontal-belt conveyors. 

Tray Classifier A hybrid like the screw-conveyor classifier, the tray classifier rakes pulp up the sloping bottom of a tank while solvent flows in the opposite direction. The solvent is forced by a baffle to the bottom of the tank at the lower end before it overflows. The sohds must be rugged enough to stand the stress of raking. 

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. 

The sorting is carried out as follows upon arrival at the center, the waste is placed in a hopper located at the start of the conveyor belt. Two workers place the material on the belt with the help of rakes. 

Ash Removal System. A rake, screw conveyor and ash box comprise the ash removal system. A rake mounted above the pinhole grate ploughs ash towards the centrally mounted ash discharge screw. A screw conveyor transports the ash via a gate equipped chute into the ash bin below. 

Specialized shore-cleaning equipment is available that is equipped with rakes, elevating conveyors, or spiked drums to remove oil and oily sand from sand shorelines. Although these devices are more selective than earth-moving equipment, they still remove more material than would be removed by hand labour. These devices do have the potential, however, to clean small amounts of tar balls from many miles of beaches in a single day. 

The coal-raking system with tilt scraper and symmetric wheels is put under the low coal-caving window, rakes the cracking drop-coal on the floor into the high troughs of scraper conveyor s head and tail. 

As with waste charging, MCUs are provided with both manual and automatic discharge systems. After burnout, the chamber of smaller units is opened and ash residue is manually raked out. With continuous-operating units, ash is continually discharged, normally into a wet well, from which it is transferred to a container or truck by means of a drag conveyor. 

The rake or cant of the flight is varied for some applications, as is the conveyor pitch or pitch angle (see Sections 2.4.8 and 2.4.10). 

When applying adsorbents, it is important to spread them evenly across the oil and to give them enough time to work. When possible, iimocuous substances should be used. Straw is cheap, and it can absorb between 8 and 30 times its own weight in oil. When it is saturated, the straw is loaded into boats with rakes or a conveyor system and transported to land. Oil can be recovered from the straw by passing it through a wringer. 

For cleaning oil from beaches, farm machinery and earthmoving equipment have been used to good effect. In many cases, a layer of straw is spread across the oil. After a few days, the oil-laden straw is raked onto a conveyor, screened to drop out sand, and sent to wringer. Recovered oil is trucked away to a refinery. The spent straw, which still contains some oil, can be blended with coal and burned in a power plant, or simply incinerated. The separated sand is washed and returned to the beach. 

Pharmaceutical wastes Screw conveyors, plows, rakes Up to 815 X Oxidation/sulfidation... 

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