GB2100397A

GB2100397A - A carrier element for components in containers such as rotating drums

Info

Publication number: GB2100397A
Application number: GB8217106A
Authority: GB
Original assignee: Kloeckner Humboldt Deutz AG
Current assignee: Kloeckner Humboldt Deutz AG
Priority date: 1981-06-12
Filing date: 1982-06-11
Publication date: 1982-12-22
Also published as: DE3123330C2; ES279689U; GB2100397B; DK263382A; ES279689Y; DE3123330A1; FR2507757A1

Abstract

Components such as paddles 5 in a rotating drum are retained by carrier elements 4 in order to improve the thermal protection of the walls 1 of the drum. The carrier elements 4 are hollow members provided with lateral openings and are filled with a fine resistant insulating substance 3 which secures the elements 4 in place. Connecting rods 14 may be arranged in the hollow chambers defined by the carrier elements 4, the rods being welded onto the walls 1 of the drum and providing the carrier elements with an additional fixing. The rotating drum is used in the heat treatment of fine grain solids. Alternatively the container may be stationary, e.g. a cyclone. <IMAGE>

Description

SPECIFICATION A carrier element for components in containers such as rotating drums The invention relates to a container such as a rotating drum for heat treating materials, said container or rotating drum being provided with a protective cladding, carrier elements for components such as paddles being arranged therein.

Paddles or vanes or blades of this type, arranged in rotary tube kilns of cement manufacturing plant, serve the purpose of improving the heat transfer conditions between the hot gases passing through the kiln and the fine grain raw materials which are to be heat treated and move in contraflow with respect to the hot gases. This provides a more even distribution of these raw materials over the crosssection of the kiln.

A rotating drum for heat treating bulk materials is known from German Auslegeschrift No.

10 60 775 in which the inner walls which are provided with a fire resistant cladding are equipped with paddles. The cladding has walled recesses which extend directly to the walls of the rotating drum. The relatively large lower portions of these paddles, which form receiving chambers in the direction of their rotation, cover the base regions of these recesses at a small spacing therefrom and are fixed thereto with the aid of screws penetrating the walls of the rotating drum.

The hot bulk material moved by a paddle within the rotating drum is forced into these receiving chambers and in this way makes direct contact with the lower portions of these paddles. These lower portions are without any protection against heat, so that there is considerable movement of heat towards the walls of the rotating drum and therefore there is a danger of a reduction in strength and stability. Such a connection between the rotating drum and the paddle is a considerable disadvantage if individual paddles are lost, for example due to the screws retaining them falling out, since in this case hot bulk goods can escape through the existing openings in the walls of the rotating drum and cause damage.

The present invention seeks to so arrange components, more particularly their carrier elements and so fix them in a container, for example, a rotating drum for heat treating materials, that the walls of the container or rotating drum are given sufficient protection from excessive heating both simply and securely.

According to the present invention there is provided a container having protecting cladding in which are arranged component carrier elements, the elements being fixed in the protective cladding and/or to the walls of the container.

The walls of the rotating drum are not in any way weakened by the method of fixing selected, for example drill holes, so that hot material for treatment is unable to escape in an uncontrolled manner.

In one refinement of the invention the carrier element is a hollow member provided with openings on all sides and is filled with a substance forming a firm connection at least with the protective cladding. The carrier element inserted into a recess in the protective cladding is reliably fixed because of the filling substance which forms a firm compound arrangement with the protective cladding via the existing openings and this makes assembly very easy.

In a further refinement of the invention the carrier element is arranged so as to be substantially embedded in the protective cladding. Components such as paddles are subject to considerable wear that is, wear due to heat and mechanical wear. This is why the paddle members are preferably detachably connected to the carrier elements which in turn are protected and therefore only subject to slight wear. This means that, when worn paddle members have to be exchanged, the exchange can be limited to the particular paddle members.

In another advantageous refinement of the invention, at least one connecting rod fixed to the walls of the rotating drum so that it cannot be detached therefrom projects into the carrier element. The connecting rod which is preferably welded to the walls of the rotating drum can be of almost any desired shape and is also used to fix the carrer element.

Finally, the outer dimensions of the hollow member, within the protective cladding, correspond to those of the bricks which form said protective cladding. This refinement has the advantage that the carrier elements can be arranged at any desired point on the inner walls of the rotating drum and in any desired arrangement without it being necessary to take any special measures with regard to the required recesses in the protective cladding. This facilitates manipulation of the carrier elements particularly during their assembly.

A preferred embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings of which: Fig. 1 shows a built in paddle with a portion of the cross-section of a rotating drum; Fig. 2 shows a section along the line Il-Il of Fig. 1; and Fig. 3 shows part of the inner walls of a rotating drum.

In Figures 1 and 2 the walls of a rotating drum are shown at 1, the inner face of which supports a protective cladding 2 comprising a fire resistant material. A carrier element 4 for a paddle or vane is inserted into a recess 3 in the protective cladding 2, said carrier element 4 being equipped with two retaining elements 6 in its region facing the inner face of the rotating drum. The paddle 5 designates an entity comprising carrier element 4 and paddle member 5'. The paddle member 5' is mounted on a carrier element 4 by means of screws which are not shown in the drawings and which are themselves mounted in bores 7 of retaining elements 6.

The carrier element 4 is a hollow u-shaped member in the plane of Fig. 1 and its open side faces the walls 1 of the rotary drum.

Its opposite side is provided with an opening 8 and its open ends are arranged axially with respect to the walls 1 of the rotating drum.

Side walls 9 of the carrier element 4 have further openings 10 and 1 The carrier element 4 is provided with angled portions 12 and 13 in order to extend the bearing surfaces which come into contact with the walls of 1 of the rotating drum. Two connecting rods 14 are welded onto the walls 1 of the rotating drum approximately at the centre of the carrier element base. The hollow chamber defined by the carrier element 4 is filled with a substance comprising a fire resistant insulating material in which the connecting rods 14 are sunk. Apart from the Y-shape shown, connecting rods 14 may alternatively have some other shape providing the connection.

The assembly of the paddles in accordance with the invention is as follows: As soon as the position of the individual paddles on the walls 1 of the rotating drum is fixed and the connecting rods 14 are welded, the carrier elements 4 are inverted over the connecting rods 14 and fixed provisionally to the walls 1 of the rotating drum with the aid of weld seams 15.Then, after bricking up the remaining inner surface of the walls 1 of the rotating drum, the carrier elements 4 are filled with a fire resistant insulating substance through their openings 8, the said insulating substance being compacted by a shaking movement provided by a vibrator, thus via the openings 10 and 11 and the open ends of the carrier elements 4 there is firm connection of this insulating substance to the remaining walling which forms the protective cladding 2 so that the carrier element 4 is secured to the walls 1 of the rotating drum.

A particular advantage of this embodiment is that there is only one relatively small crosssection available for the transfer of heat from the inner chamber of the rotating drum via the carrier element 4 to the walls 1 of the rotating drum, because of the openings 10 and 11 in the carrier elements, so that the wall 1 of the rotating drum is reliably protected from thermal overloading.

Even if individual paddle members 5' are lost this does not damage the walls 1 of the rotating drum because the embedded carrier element 4 prevents hot material for treatment from advancing to the wall 1.

It should be underlined that it is possible for example to provide additional or alternative connection of the carrier elements 4 to the wall 2 at the rotating drum (even without using the described connecting rod 14), for example via a weld connection.

Fig. 3 shows a part of the inner face of a rotating drum in developed view. The arrow 16 shows the direction of rotation and the arrow 1 7 the direction in which the material to be treated is conveyed. It can be seen that the shape and size of the carrier elements 4 correspond to those of the bricks 1 8 which form the protective cladding 2. The same reference symbols have been used for the other components of the drawings as in Figs. 1 and 2. The recesses requires to house the carrier elements 4 in the protective cladding 2 simply represent gaps in the wall which do not require any special measures.

The fixing of thie paddles in arrnngementa in accordance with the invention may find an application not only in rotary tube kilns but in rotating drums of any kind in which it is important to provide better distribution of material for treatment in a flow of gas, tube coolers for example. The carrier elements of arrangements in accordance with the invention can be used not only for paddle fixings but also for components of all types, for example protective elements. In addition to applications in rotating drums, there are also applications in stationary containers in which a thermal process takes place, e.g. in cyclones.

Claims

1. A container having protecting cladding in which are arranged component carrier elements, the elements being fixed in the protective cladding and/or to the walls of the container.

2. A container according to claim 1 which is a rotating drum for heat treating materials.

3. A container according to claim 1 or 2 wherein the elements carry paddles.

4. A container according to any preceding claim wherein each carrier element is a hollow member provided with openings on all sides and is filled with a substance forming a firm connection at least with the protective cladding.

5. A container according to any preceding claim wherein each carrier element is arranged to be substantially embedded in the protective cladding.

6. A container according to any preceding claim wherein at least one connecting rod projects into each carrier element and is fixed to the walls of the container.

7. A container according to any preceding claim wherein each carrier element has a Ushaped cross-section.

8. A container according to any preceding claim wherein the protective cladding comprises a plurality of similar sized bricks and the outer dimensions of at least those parts of each carrier element which are within the protective cladding correspond to the outer dimensions of the bricks.

9. A container substantially as herein described with reference to the accompanying drawings.