Method for drying pasty materials

Details Method for drying pasty materials Method for drying pasty materials

F - Mech Eng,Light,Heat,Weapons

26

B

F26B 7/00 (2006.01) C02F 11/12 (2006.01) F26B 17/04 (2006.01) F26B 17/08 (2006.01)

Patent

CA 2386075

According to the invention, on drying paste-like materials, in particular, clarifier sludge, the material is previously compacted to a dry weight in the range 60 80 % in a drying intermediate stage, such that a relatively low energy requirement results. The transport of the material, both during the pre-drying and after leaving the compacting device (5), is by means of one or two transport belts (3, 4) which are arranged in series in the direction of transport, which permit the through-flow of air and which are enclosed in a common housing (2). As a result, the drying occurs under the same conditions before or after compacting, such that a plant for carrying out the above is easy and thus economical to install. The end product has advantageous properties with regard to density and friability, such that on subsequent handling the development of dust is avoided.

Ce procédé de séchage de matières pâteuses, en particulier de boues d'épuration, consiste à compacter la matière au cours d'une étape intermédiaire du processus de séchage, lorsque le pourcentage de matières sèches atteint 50 à 80 % environ, ce qui nécessite une quantité d'énergie relativement réduite. La matière est transportée aussi bien pendant le séchage préliminaire qu'à la sortie de l'installation (5) de compactage sur une ou deux courroies (3, 4) de transport successives, perméables à l'air, enfermées dans une enceinte (2) commune. Le séchage précédant et suivant le compactage est effectué dans des conditions de traitement identiques de sorte que la réalisation d'une installation permettant la mise en oeuvre de ce procédé est simple et par conséquent peu coûteuse. Le produit fini présente des caractéristiques avantageuses en matière de densité et de résistance au frottement, ce qui permet d'éviter la production de poussières lors des manipulations ultérieures.

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