Drying and gas or vapor contact with solids – Process – By centrifugal force
Patent
1998-07-10
2000-05-23
Gravini, Stephen
Drying and gas or vapor contact with solids
Process
By centrifugal force
34369, 34371, 34135, 34147, F26B 508
Patent
active
060652241
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for the aerobic treatment, conditioning and/or drying of moist, preferably at least partly organic material essentially of a solid or paste-like nature, utilizing a specific reactor geometry and special inserts. The device is suitable in particular for the microbiological treatment, conditioning and/or hygienization of organic residues and other organic wastes, in particular of industrial and communal sewage sludges, and of wastes from agricultural production, large-scale animal keeping, horticulture and industrial production of food and of luxury consumables, for the purpose of long-term stabilization of the residues and/or for the production of organic and organo-mineral fertilizers, culture substrates and/or soil conditioners.
PRIOR ART
The most closely related prior art (AT 382 862 B) describes a process and a device for drying layers' droppings or similar paste-like substance. There, in a microbiological phase, shaped, stable supports are populated with selective microorganisms, the paste-like substances to be treated are compressed beforehand into strand-like pellets and suitable climatic conditions for the activity of microorganisms are created by means of conditioned air. The resulting heat and moisture are removed by the air stream. After the end of the microbiological phase, the remaining material is dried in a drying phase to the desired dryness by means of air flowing through. The device used for this purpose has a closed cylindrical vessel which contains in the interior two coaxially arranged, air-permeable cylinders which are made of perforated sheet metal, can be vibrated vertically and contains [sic], between the perforated metal sheets, supports for the selected microorganisms. The air inlet and air outlet pipes and the fans are mounted in such a way as to force a centripetal air flow from the inner wall of the vessel through the perforated metal sheets to the centre of the vessel, from where it is removed from the vessel via an air outlet pipe.
By means of this process, it is possible by using microorganisms which are concentrated on supports to dry granulated, briquette-like or shredded, paste-like substances with the lowest possible energy. Finally, it is intended, for example, to process layers' droppings from large-scale animal keeping in such a way that the dried product in granular form emerges from the drying process and can be stored without problems and also sold in supermarkets as biological fertilizer. In addition, a small part of the organic as well as inorganic substances present are converted by the microorganisms into CO.sub.2, heat and residues in this process, which is an advantageous effect in that these organic substances are frequently undesired in the end product since they have an unpleasant smell and limit the stability of the dried end product.
Disadvantages of this plant include the fact that, as a result of the reactor geometry, a substantially larger inlet area into the reaction chamber than outlet area out of the reaction chamber is available to the air flowing through always only in one direction, namely centripetally. As a result of this, in particular in the case of relatively large layer thicknesses of the reaction chamber, for example more than 100 cm, the air velocity at the outlet orifices of the inner perforated sheet metal cylinder is so high that--especially in the drying phase--it can also transport relatively small particles which are then deposited outside the reaction chamber in the bioreactor and must be removed from there by a tedious procedure since they would otherwise cause an undesired odor.
The problem of the undesired emergence of the content from the reaction chamber also occurs in the course of the filling process, where frequently particles are thrown or forced through the holes of the perforated sheet metal cylinder into the air chamber.
A further disadvantage of the known plant is that, especially in the region of the base of the reaction chamber, where the freshly intr
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Gravini Stephen
Interlicense Den Haag B.V.
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