Heating – Tumbler-type rotary - drum furnace
Patent
1995-06-09
1998-03-24
Nelli, Raymond A.
Heating
Tumbler-type rotary - drum furnace
F27B 700
Patent
active
057305900
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an inlet for feeding raw material into a rotary drum, particularly into a cylindrical rotary kiln for the production of cement clinkers, the rotary drum provided with a chute that leads to an inlet opening of the rotary drum. The chute consists of a metal mantle and an interior lining of refractory material, with the part of the chute located at the very front being formed by a collar that extends into the rotary drum. The collar is removably attached to the chute and designed to be hollow and closed toward the rotary drum.
Inlets of cylindrical rotary kilns with inlet chutes for the material are, for example, known from U.S. Pat. No. 3,547,417. The chutes utilized with such units are subject to a very high abrasive and thermal stress which is associated with a progressive abrasion of the refractory lining, particularly in the area of the outlet end of the chute.
In order to prevent the disadvantages, associated therewith it is known from DE-32 45 702 C2 to provide at the end of the chute a collar for supporting the refractory lining which collar is double-walled and consists of separate supporting segments and is facing the rotary drum. By individual stays the collar is divided into chambers which are open toward the exterior of the chute and can be cooled by introducing a cooling medium from the exterior.
However, this inlet is also subject to high abrasive forces so that maintenance work is often required during its service life.
The object of the invention is to develop the known inlet for feeding raw materials into a rotary drum such that greater repair intervals during service life and greater ease of service are achieved.
SUMMARY OF THE INVENTION
For resolving this object, it is suggested that the collar is provided with a refractory abrasion protector of a ceramic material at the surfaces facing the rotary drum, and that the collar is provided at its back side with a projection by means of which the collar can be suspended on the chute or a part thereof.
An inlet for introducing raw material into a rotary drum according to the present invention is primarily characterized by: material, the chute having a forward end for connecting the chute to a rotary drum; to extend into the rotary drum, the collar being closed toward the rotary drum; heatproof, ceramic protective lining against abrasion; and side having a projection for connecting the collar to the chute.
Preferably, the projection extends perpendicular to a longitudinal axis of the collar.
Such an inlet shows a significantly reduced wear in the area of the collar so that it is less frequently required, compared with known constructions, to carry out repairs and maintenance work in the area of the inlet of the rotary drum. Moreover, it is particularly simple to attach the collar, respectively, to remove it again. Since it is simply suspended on the chute, it is not necessary to remove the refractory lining of the chute for replacing the collar, so that, altogether, a construction is achieved which makes repair and maintenance easier.
BRIEF DESCRIPTION OF THE DRAWINGS
Further details and advantages of the object of the invention follow from the subsequent description of the accompanying drawings. It is shown in:
FIG. 1 a schematic of a unit for the production of cement clinkers;
FIG. 2 a section of FIG. 1 in the area of the inlet to a cylindrical rotary kiln, and
FIG. 3 details of a collar arranged in the area of the inlet.
DESCRIPTION OF PREFERRED EMBODIMENTS
FIG. 1 illustrates a unit for the production of cement clinkers. It comprises a cylindrical rotary kiln in which the cement clinker is fired, a preheating system 2 which is designed in the embodiment as a four-step cyclone heat exchanger unit, as well as a cooling device 3 downstream of the cylindrical rotary kiln 1.
The raw material enters the preheating system 2 at the location with the reference numeral 4, passes the individual steps one after another in order to reach the cylindrical rotary kiln 1 subsequently via a kiln inle
REFERENCES:
patent: 2266396 (1941-12-01), Lincoln et al.
patent: 3436061 (1969-04-01), Zinn
patent: 3547417 (1970-12-01), Elkjaer
patent: 4508503 (1985-04-01), Ramesohl
patent: 5123496 (1992-06-01), Ahvenainen
LandOfFree
Inlet for feeding raw materials into a rotary drum does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Inlet for feeding raw materials into a rotary drum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inlet for feeding raw materials into a rotary drum will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2284454