Mesh Belt Dryer For Industry

These objects have been achieved by a steam dryer for pressed fibrous material according

to the invention, comprising a pressurized, horizontally arranged pipe which is closed at both ends. The pressurized pipe is provided with diametrically opposed steam supply and steam exhaust manifold arrangements. At least one heat exchanger is arranged in a lengthwise half of the pressurized pipe, whereby this heat exchanger extends across the entire flow-through cross-section for the steam. The other lengthwise half of the pressurized pipe is provided with endless loop screens or mesh mesh belt dryer which are arranged one above another and are driveable in opposite directions in the manner of a conveyor mesh belt dryer. These mesh mesh belt dryer convey the material to be dried and transfer the material from mesh belt dryer to mesh belt dryer. A supply-or feed-arrangement is provided above the upper mesh mesh belt dryer and an output or discharge device is provided underneath the lowest mesh mesh belt dryer in order to respectively supply and discharge the material to be dried. The mesh mesh belt dryer define a separation plane between pressure and exhaust chambers which are alternatingly arranged above and below each mesh mesh belt dryer. The pressure chambers comprise inflow ports open to the lengthwise half of the pressurized pipe with the heat exchanger, and the exhaust chambers comprise outflow ports open to at least one exhaust space.

By means of the described arrangement and drive direction of the mesh mesh belt dryer, after material is supplied to the upper mesh belt dryer, the material is conveyed and then transferred to each respective lower mesh belt dryer. Thus, the layer thickness of the material on the mesh belt dryer may be adjusted to match the existing drying requirements by individually adjusting the drive velocity of the mesh belt dryer to different speed as needed. Similarly, the total processing time of the material in the steam flow may be adjusted over a large range of values by varying the movement velocity of the driven mesh mesh belt dryer in unison. The steam is directed through the pressure plenum to all the mesh belt dryer in parallel, so that the steam penetrating each material layer on the separate mesh mesh belt dryer comprises the same moisture absorption capacity for all mesh belt dryer.

As further shown in FIG. 4, an additional heat exchanger 35 is arranged to extend across the steam flow cross-section above the lowest mesh belt dryer 8". This heat exchanger 35 further heats the steam penetrating the material on the lowest mesh belt dryer 8", whereby the final level of dryness of the material is considerably increased.

by: ericfu

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