Heating – Tumbler-type rotary - drum furnace
Patent
1993-07-07
1995-02-28
Yuen, Henry C.
Heating
Tumbler-type rotary - drum furnace
432107, 432114, F27B 700
Patent
active
053932250
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a rotating tube heat treatment installation, in particular rotating tubular kiln, with indirect heat feed or dissipation for the thermal treatment of bulk goods or slags, preferably for the splitting of MgSO.sub.3 into MgO and SO.sub.2, in which a rotating tube and a coaxial tubular jacket connected with it so as to be torsion-resistant and provided with an insulation is held in at least two bearings and the tubular jacket carries at its outside the drive as well as potential bearing races and bandings as well as being connected at its ends through a sealing structure with stationary connections for the heat exchange fluid.
Treatment installations of this type are known from DE-A1 37 41 112, PCT-WO 84/00604, DE-C1 36 32 548 and DE-C3 24 33 676. They have, however, the disadvantage that the rotating tube forms with the tubular jacket a structural part which at its inside is chemically attacked by the medium to be treated and thereby, due to the high temperatures, has a low creep rupture strength so that the structural part as a whole must be viewed as a wearing part. In the case of the known constructions the machine devices such as bearing races, drive crowns, etc. are fastened directly on the rotating tube so that practically the entire installations must be viewed as a wearing part and the total construction costs involve the rotatable kiln part.
The invention is based on the task of freeing the rotating tube as a wearing part of all unnecessary details and to assign them to a jacketlike separate second structural part which does not come into contact with the medium being treated in the rotating tube and, consequently, is not subject to chemical corrosion.
The invention is characterized thereby that the jacket tube is connected with the rotating tube through a detachable carrier system in the form of radial resiliently supported pins, in particular ceramic pins, which permit a heat-elastic relative motion of the jacket tube and the rotating tube in the direction of the line of action of the springs. In particular, the jacket tube has at its inside a heat insulation known per se, such as for example light insulation, and the connections for the heat exchange fluid are preferably implemented dividable in the horizontal direction. In advantageous manner the pins are implemented as an intermediate support of the rotating tube.
An essential application purpose of the treatment installation according to the invention is seen in the splitting of the magnesium monosulfite, which takes place at approximately 800.degree. C. wherein in the medium flowing through the rotating tube is comprised approximately 20% SO.sub.2 and, consequently, is highly corrosive.
A further application is found in the cooling of aluminum slag wherein the slag results practically burning and the combustion through lack of oxygen and simultaneous cooling is stopped as quickly as possible so that the granulate forming still comprises aluminum which can be recovered. In this case corrosive vapors are generated also, in particular through the addition of salt in the aluminum melting process, which vapors, together with the liquid aluminum, corrosively stress the inside of the rotating tube so that here also a replacement of the rotating tube must be considered within the operating life of the installation.
The invention is represented in the enclosed FIGURE by example and schematically.
The FIGURE depicts an indirectly heated kiln system with a rotatable inner tube 1, into which the bulk good to be treated is fed in the absence of air via the input device 12 and via the rotary motion of the rotating tube 1 of a further treatment device 13, wherein in the case of the magnesium sulfite splitting in the treatment device 13 a separation takes place into SO.sub.2 and MgO, and a jacket tube 2 connected therewith. The essentially straight rotating tube 1 has at its outside welded-on sheets with grooves 11 which pins 5 supported on springs 6 engage which are disposed radially and in the rotatable jacket tube 2 at which are s
REFERENCES:
patent: 4612711 (1986-09-01), Murray
patent: 4988289 (1991-01-01), Coucher
Freiberger Norbert
Glaser Wolfgang
Wolschner Bernd
Zikeli Stefan
Austrian Energy & Environment SGP/Waagner Biro GmbH
Lenzing Aktiengesellschaft
Yuen Henry C.
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