The Respective Arrangement Of The Mesh Belt Dryer

The respective arrangement of the mesh belt dryer is such that an upper conveying

run of each conveying belt separates the corresponding pressure chamber from the respective exhaust chamber. The empty lower run of each mesh belt dryer extends above the conveying run of the next lower mesh belt. Both runs of each mesh belt extend across the entire through-flow cross-section for the steam from the pressure chamber into the exhaust chamber. This feature assures that the carrying surface of the empty lower run of a belt faces downwardly and is essentially empty of material, which has already been transferred to the next lower belt at the transfer point. Thus, the empty lower belt run can be penetrated by the steam in a downward direction, or from the inside out, so to speak, whereby any material particles still clinging to the carrying surface, are carried downwardly by the steam onto the material layer on the conveying run of the next lower mesh belt dryer, whereby an additional self-cleaning effect is achieved beyond the typical cleaning of such mesh belts in conveyor belt dryers, wherein additional mechanical cleaning means, such as brushes or the like, are arranged to clean the mesh belts.

The material transferred to the upper run of the lowest mesh belt dryer has already been extensively pre-dried. The extraction of the remaining water for achieving the desired level of dryness, becomes more difficult as the concentration of salts and other water-binding compounds in the remaining water is increased. Therefore, it is advantageous to provide an additional heat exchanger extending across the inflow cross-section above the upper run of the lowest mesh belt. The use of this extra heat exchanger is especially advantageous, for example for drying sugar beet cossettes which are still wetted by syrup when they are finally transferred to the lowest mesh belt dryer. The remaining water in this syrup can only be extracted by the steam at increased temperature.

The uppermost mesh belt dryer 8 is driven in the direction of arrow 9 as seen in FIG. 1. The several mesh belts 8, 8', 8" are stacked one above the other and staggered in their lengthwise direction for transferring the material to the respective lower belt. Thus, the material which is deposited on the upper run 8a of the uppermost mesh belt 8 is conveyed to the right end of the belt as seen in FIG. 1, and is then transferred to the next lower mesh belt 8'. The material is then transferred in a similar manner from the middle mesh belt 8' to the lowest mesh belt 8".

by: ericfu

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