Drying and gas or vapor contact with solids – Process – Mechanical liquid removal
Patent
1994-10-07
1996-05-07
Yeung, James C.
Drying and gas or vapor contact with solids
Process
Mechanical liquid removal
34437, 34104, 34105, F26B 514
Patent
active
055134467
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method for drying hollow bodies having an access opening, especially for drying industrial barrels after washing, where the hollow body is tilted and a residual liquid quantity that is still contained in the hollow body and that has gathered at a lowest point of the hollow body is removed from the hollow body by means of a suction pipe introduced through the access opening.
The invention further relates to an apparatus for drying hollow bodies having an access opening and being positioned on an inclined support, especially for drying industrial barrels after washing, having holding means for the hollow bodies and a suction pipe as well as a displacing device for introducing the suction pipe into the access opening in such a way that the end of the suction pipe comes to lie at the lowest point within the hollow body.
A method and an apparatus of the before-mentioned type is known from SU-PS-423 530.
Given the general shortage of raw materials, it is of general interest, with respect to the use of hollow bodies, to enable even such hollow bodies, which formerly would be used only once, i.e. as a single-used packing, to be used repeatedly, i.e. as a multiple-use packing.
Whenever the term "hollow bodies" is used in the context of this application, this term is to be interpreted as referring to industrially employed containers by means of which liquids or pourable solid materials are transported. For reasons of greater simplicity and better illustration, the following specification will refer to the example of industrial barrels, without however thereby limiting the scope of the present invention.
Industrial barrels are produced and in use in different sizes and different designs. One typical industrial barrel is a steel-sheet drum having a diameter of approximately 560 mm and a height of approximately 900 mm, corresponding to a volume of approximately 220 liters. Barrels of this type are used for transporting the most different goods, including for example organic liquids, such as oils, varnishes, fuels, and the like.
Such industrial barrels are already in use as multiple-use packings, which requires however that the barrels be reconditioned after every use. According to the known reconditioning methods for such barrels, one proceeds for example as follows: First of all, any residual content is removed from the barrels. Then the barrel inside is washed, for example using a soda lye, and then rinsed. The barrel edges are then mechanically dressed, and dents are removed from the barrel bodies, for example by blowing in compressed air. Thereafter, one removes old external paint finishes, if any, and cleans the barrel from rust. Finally, a new paint finish is applied, the barrels are checked for tightness, rinsed once more with water, and are then dried.
It is of course desirable that upon completion of these procedural steps, the barrel inside should be dry, if possible. This is necessary on the one hand in order to prevent further corrosion of the barrels; on the other hand, however, it must be ensured that no residual liquid or residual water remains in the barrel as such residual quantities could possibly react with the medium to be filled in later.
According to the known methods, final drying of the barrels was effected by heating them directly with a gas flame, or by drying them with hot air, hot steam and compressed-air. In a practical example, for drying a barrel of the described type, 5 Kg of steam at a pressure of 12 bar are needed for example, in which case a circulating-air temperature of 180.degree. C. can be reached via a heat exchanger. For pre-heating the barrels, 0.05 Kg of fuel oil and a total of approximately 0.2 KW of electric power are consumed per barrel for the circulating-air fans and the blow-out devices.
In drying barrels of this type, it has further been known to heat compressed-air via heat exchangers and to blow the heated air into the barrels, but this process that does without recirculated air leads to an even higher en
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Hauschka Peter
Neubauer Wilhelm
Aichelin GmbH
Yeung James C.
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