Drying and gas or vapor contact with solids – Apparatus – Stationary receptacle or tube with agitator or conveyor
Patent
1986-06-04
1987-12-08
Schwartz, Larry I.
Drying and gas or vapor contact with solids
Apparatus
Stationary receptacle or tube with agitator or conveyor
34182, 34183, 165 92, F26B 1104
Patent
active
047110414
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a drier of wet comminuted materials such as organic matter.
Such driers are known, for example from Danish Pat. No. 138.406, where the drier's rotor is provided with helical cavities in the annular drying elements, which on the surface have completely smooth faces in contact with the material to be dried, so that it is difficult for said material to stick fast and reduce the efficiency of the drier. However, stationary clearing elements can be arranged to reach in between the drying elements, for example in the zone where the material to be dried is still very adhesive. Moreover, transverse or obliquely-positioned vanes can be disposed on the rotating drying elements themselves, which help to move the material being dried forward towards the discharge opening for the dried product. Driers of this kind are used for the drying of fishmeal, comminuted offal, mash and similar products, and are often designed for high performance, e.g. for the drying of 1 to 4 tons per hour.
SUMMARY OF THE INVENTION
The object of the invention is to improve driers of this kind, so that an improved drying and mixing during the drying is achieved, whereby the efficiency of the drier is increased.
This is achieved by constructing the drier according to the invention. The lifting elements lift the material being dried in portions, and tear any possible lumps into pieces. The lifted material falls down over the drying rotor, and is thus given more frequent contact with the heating surfaces. At the same time, a better stirring is thus achieved, so that the material being dried is mixed more thoroughly, the result being a completely uniform product.
The lifting elements will sit in a particularly secure manner, in that the lifting elements can be fastened on two sides.
By way of example, the drier may be constructed so that it provides further possibilities of achieving a solid mounting and securing of the lifting elements.
The drier according to the invention can be constructed so that the lifted material is spread a lot during its fall down over the rotor, and thus comes into contact with the whole of the heating surface, while at the same time a great mixing effect is achieved.
It is also possible in a simple manner to secure the lifting elements with bolts and to replace them, for example if they are worn or defect, but one can also adapt the drier for another production where another number of lifting elements provide an optimum operation.
One can also determine now quickly the material being dried shall travel forwards in the drier and, if there is a need for this, the lifting elements can be disposed in such a manner that the material being dried remains longer in one zone than in another. A further possibility is thus achieved of being able to set the drier precisely for the raw materials to be dired. The consumption of energy is hereby optimized, so that the drier according to the invention uses the least possible thermal energy for the process without any adverse affect on the speed of production.
The lifting element achieved hereby is robust but still inexpensive, and can be produced in a simple manner from plate material with sufficient strength and wear characteristics. An extremely simple construction is also acheivable which can be stamped out in one operation, e.g. so that the completely finished lifting element is complete with securing holes. Furthermore, if the plate piece is formed symmetrically and securing holes are provided in two free edges in both triangular portions, the lifting element can be turned when the leading edge is worn, hereby further increasing its lifetime.
The drier according to the invention has proved to be particularly well-suited for use in the production of meat meal, bone meal and fish meal, and great improvements have been achieved hereby, both of a technical as well economic nature.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in closer detail with reference to the drawing, which shows a preferred embodi
REFERENCES:
patent: 3701713 (1972-10-01), Bennett et al.
patent: 3777810 (1973-12-01), Phillips
A/S Atlas
Schwartz Larry I.
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