DE202008007506U1 - Fireproof outer lining for a burner lance - Google Patents

Abstract

Outer lining of a jacket tube (2) of a burner lance (1) for rotary kilns, z. As cement rotary kilns, with prefabricated refractory moldings in a front fire-loaded Brennerlanzenkopfzone (4) and a refractory monolithic material (5), z. B. refractory concrete, in a less fire-loaded rear Brennerlanzenzone (6) characterized by a refractory lining as outer lining in the Brennerlanzenkopfzone (4) with prefabricated pressed and fired refractory shaped bricks (3), a on the jacket tube (2) seated Zustellring (10, 11) around the jacket tube (2) are arranged lined up, wherein a on the jacket tube (2) fixed holding element (21) in each case two juxtaposed blocks (3) pairs, so that twice as many stones (3) as holding elements ( 21) in a Zustellring (10, 11) are present, and wherein each holding element (21) proportionally in a respective spatial form adapted recess (20) of the two stones (3) of the block pair is added and undercut-like engaging behind holding means (18, 24, 25, 34, 37) between the retaining element (21) and the recesses (20) of the ...

Description

The The invention relates to refractory outer lining for a, in particular suitable for a cement rotary kiln Burner lance, in particular for the fire-side burner lance head zone.

Such an outer lining as a delivery is for example from the DD 223 802 A1 known. With the known delivery, the lower service life of the refractory material in the projecting into the oven, from the outside highly temperature-loaded Brennerlanzenkopfzone and the associated complex repairs after wear are to be compensated. For this purpose, a burner lance in the burner lance head zone is delivered with monolithic prefabricated parts made of refractory concrete to allow for rapid replacement after wear. The subsequent, less temperature-loaded Brennerlanzenzonen are monolithically encapsulated with solidified Feuerbetonmasse and can ensure sufficiently longer life. About an attachment of the monolithic finished parts made of refractory concrete at the burner lance no information is provided.

Adjacent state of the art results for example from DE 20 303 937 U1 . DE 29 911 973 U1 and DE 197 37 303 A1 ,

described In this state of the art, metallic anchor elements for the burner lance sheathing ramming masses, the metallic burner lance casing pipe are attached with their foot area, wherein at the attachment point opposite region arranged so-called branching elements are and some spatial forms of anchor elements in vertical longitudinal section may have a V-shape.

task the invention is, in particular for the burner lance head zone a burner lance suitable delivery of prefabricated refractory To create shaped bricks that are easy to assemble and easy to wear to repair.

These The object is solved by the features of claim 1. Advantageous developments of the invention are in the dependent Subclaims characterized. Based on the drawings The invention is explained in more detail by way of example. Show it:

1 a longitudinal section through an inventively designed burner lance for a cement rotary kiln (section AA in 8th );

2 a perspective view of the burner lance after 1 ;

3 in the 2 circled detail;

4 in perspective, a burner lance holder according to the invention for pairwise holding two adjacently arranged conglomerates in the circumferential direction of the burner lance;

5 in perspective, a molded block according to the invention made of a refractory material;

6a and 6b perspective attachment alternatives for the burner lance holder on the burner lance casing tube;

7 in perspective, the assembly of the stones;

8th a cross section through the present invention equipped burner lance head zone (section BB in 1 );

9 in perspective, another embodiment of a burner lance holder according to the invention;

10 in perspective, the detail of the burner lance head zone with the holder 9 ;

11 in perspective, a shaped stone adapted to the holder 9 ,

In the 1 and 2 pictured burner lance 1 usually has a metallic jacket tube 2 which must be protected with refractory materials against the high temperatures caused by the flame of the burner in a rotary kiln room into which the burner lance projects in part-zone fashion. In the interior of the jacket pipe 2 For example, burner devices are arranged and further tubes can be provided. The interior furnishings are not shown and are not described because they are not relevant to the invention. The invention is concerned with a quick and easy replaceable outer lining of the jacket tube, especially in the highly temperature-sensitive zones.

The exemplified burner lance 1 with respect to the refractory lining is divided into one with refractory shaped bricks 3 Delivered, relatively short front, heavily temperature-loaded burner lance head zone 4 and a rearwardly extending, with a monolithic refractory hardened mass, for example, with hardened Feuerbeton 5 sheathed, relatively long rear, less temperature-loaded Brennerlanzenzone 6 ,

In the rear burner lancet zone 6 are, as usual, longitudinal joints 7 and transverse joints 8th introduced into the Feuerbetonummantelung that allow thermal expansion of the sheath material.

The fire concrete 5 is in a conventional manner by means of the jacket tube 2 attached anchor elements 9 anchored, as for example in the German utility model DE 20 303 937 U1 to be discribed.

The particular in 3 pictured burner lance head zone 4 has in the example shown two in the longitudinal direction of the lance 1 juxtaposed delivery rings 10 . 11 on, with the delivery ring 10 at the head of the lance 1 is arranged.

The delivery rings 10 . 11 each consist of circumferentially juxtaposed shaped stones 3 laying on the surface of the jacket pipe 2 seated. The form stones 3 are pressed and fired shaped bricks made of refractory material. They are characterized in particular by high strength, high thermal shock resistance and high corrosion resistance.

The spatial form of the form stones 3 of a refractory material is chosen such that the stringing results in a Zustellring. Accordingly, the stones are 3 Trapezoidal in cross-section and have a narrower bottom surface 10 , a wider outer surface 13 , two oblique, to the ground surface 2 mutually running side surfaces 14 . 15 and two end faces 16 . 17 on ( 5 ). The surfaces of the form stones 3 are expediently designed as flat surfaces, because the production of the stones can be done conventionally. It is within the scope of the invention, the bottom surface 12 the curvature of the jacket tube 2 concave arched to adapt. Similarly, the outer surface 13 be executed convex curved.

In one of the side surfaces 14 or 15 is a down to the floor area 12 opening, in plan view of the side surface 14 or 15 dovetailed recess 20 introduced, the two laterally opposite, down to each other to running abutment surfaces 18 forming downwardly into spaced, gap forming abutment surfaces 19 pass. The other side surface 14 or 15 is continuously planar. This particular spatial form of the recess 20 is easy to shape. For the spatial form of the recess from is essential that abutment surfaces are present, the one engaging in the recess, on the surface of the jacket tube 2 fastened retaining element can undercut undercut, so that the stones 3 on the jacket pipe 2 being held. In this respect - are in the longitudinal section of the recess 20 considered - for example, trapezoidal, triangular, circular arc-shaped recesses or recesses with corrugated walls od. Like. Suitable if underarchive abutment surfaces 18 are formed.

For the recess 20 to 5 in particular, a holding element is suitable 21 made of metal or ceramic according to 4 , The holding element 21 has a foot plate 22 , one of the foot plate 22 protruding bridge 23 and two from the jetty 23 outgoing, diverging V-shaped obliquely upwardly extending abutment arms 24 . 25 on. The width of the abutment arms 24 . 25 corresponds to the length of the foot plate 22 , being a narrow bridge 23 at the edge of the foot plate 22 is provided, which is only about a quarter of the width of the abutment arms 24 . 25 resulting in a cut-out 26 above the footplate 22 results. Below the cutout 26 is a slot 27 in the foot plate 22 brought in. In the slot 27 can one on the jacket pipe 2 fastened and from the jacket pipe 2 intervene protruding screw shaft, so that the retaining element 21 with a mother 28 can be fixed ( 6a ). Alternatively, the foot plate 22 on the jacket pipe 2 with a weld 29 be attached ( 6b ).

According to the invention, a holding element engages 21 in each case a recess 20 neighboring shaped stones 3 so that the shaped stones 3 be held in pairs, with the outer surfaces of the abutment arms 24 . 25 from the abutment surfaces 18 of the form stones 3 For example, be interlocked form-fitting. Accordingly, the spatial shape of the recess 20 of the form stones 3 the spatial shape of the holding element 21 customized. In deviating from the illustrated spatial forms other spatial forms is equally to ensure that the recess 20 Has elements, the correspondingly adapted elements of the holding element 21 grip so that two shaped stones 3 in pairs of a holding element 21 be supported and always an undercut element of the retaining element 21 is under attack, for example, form-fitting or merely supporting. In this respect, the retaining element 21 in longitudinal section Y-shaped, circular arc, trapezoidal, dovetail-shaped od. The like. Be formed.

The paired arrangement shortens the assembly time and the material used for the holding elements, because fewer holding elements than stones 3 be used. In addition, the recesses 20 must be molded with only a relatively small depth, so that the strength of a molded block is not reduced by deep recesses. In particular, holding elements 21 used, which has no notch effect on the mating surfaces or abutment surfaces of the recesses 20 exercise, because notch effects can lead to the breaking out of stone material. Accordingly, in particular the spatial forms of holding elements and recesses are suitable, in which engaging behind z. B. inclined surfaces meet, such as in the in 1 to 8th illustrated spatial forms or in trapezoidal room forms or dovetail space shapes or circular arc space forms od. Like.

The inventive paired mounting in the 1 to 8th depicted delivery according to the invention or a delivery with equivalent holding elements 21 and adjusted recesses 20 is done by putting on a jacket pipe 2 to a located in six o'clock position generatrix of the jacket tube 2 a holding element 21 welded on and from both peripheral sides each a molded block 3 against the holding element 21 is set, with the recesses 20 the two form stones 3 in pairs the retaining element 21 overlap laterally.

Subsequently, another shape stone 3 with its continuous flat side surface 15 against the continuous flat surface 15 an already held formstone 3 set, then a holding element in the recess 20 this further form stone 3 pushed and the retaining element 21 on the jacket pipe 2 attached, for example, welded. After that, the next shape stone will be made 3 with its recess 20 , the retaining element 21 across, against the already held stone form 3 set. This assembly process continues until delivery is completed except for a stone gap. The gap then becomes a gap block 3a pushed and mortared, in which both sides 14 . 15 continuous planar, ie without a recess 20 are formed. Of course, but also an inventive with a recess 20 provided molded stone 3 be put into the gap and mortared there.

An even easier mountable two-piece retaining element 21 is in 9 and 10 shown. This holding element has a standing upright in the welded state retaining element plate 30 made of weldable metal, with its foot area on the jacket tube 2 with a weld 29 is welded on. The head area 32 has expediently a circular arc-shaped edge and has a hole 33 on. In the hole 33 expediently it is in the direction of the foot area 31 arcuately curved bolt 34 , preferably loosely inserted. The radius of curvature of the bolt 34 corresponds to z. B. the radius of the jacket tube 2 and is for example 110 to 130, in particular 115 to 125 mm at a diameter of 14 to 18, in particular 15 to 17 mm and a length of 45 to 55, in particular from 48 to 53 mm, the thickness of the plate 30, for example between 8 and 12, in particular between 9 and 11 mm, the height between 55 and 65, in particular between 58 and 62 mm and the width 30 to 40, in particular 33 to 38 mm. The side edges 35 the plate 30 are aligned parallel to each other and perpendicular to the longitudinal surface line of the jacket tube 2 , where the sheet plane of the plate 30 in the longitudinal direction of the jacket tube 2 extends as the detail of the burner head zone 4 in 10 shows the details 3 equivalent. The side edges 35 can also head towards the head area 32 be formed converging.

One to the retaining elements 21 to 9 and 10 matching form stone 3 is in 11 shown. The recess 20 is in this case torbogenförmig and the flat side or broad side shape of the plate 30 customized. In the recessed back surface 36 the recess 20 is a blind hole in the bow area 37 introduced, in which the bolt 34 can intervene.

The depth of the recess 20 is expediently half the thickness of the plate 30 , This preferably also applies to the similar recesses for other spatial forms of holding elements.

The advantage of a retaining element 21 to 9 and 10 is that the assembly of the delivery according to the invention is very simple. You can get all the plates first 30 before setting the stones 3 weld on according to a given position plan. Then you start with a, for example, in a six o'clock position of the jacket tube 2 located plate 30 and put a shape stone 3 against the plate 30 , Then the bolt 34 through the plate 30 in the hole 37 of the formstone 3 stuck and a second stone 3 with its recess 20 against the plate 30 set, with the over the plate 30 protruding bolts 34 in the hole 37 of the second form stone 3 intervenes. Then another shape stone 3 radially against the casing pipe 2 set, with the recess 20 via the correspondingly positioned second plate, for example fixed in a four o'clock position 30 slipped, with the continuous flat side surfaces 15 the now adjacent form stones 3 lie together. With the fourth stone 3 one proceeds as with the second stone 3 , after in the second plate 30 a bolt 34 has been plugged, resulting in that the second pair of blocks is mounted.

Also in this case, as in the out 8th recognizable case, the last gap of delivery with a molded block 3 or shaped stone 3a occupied, who is mortgaged.

According to a further embodiment of the invention, the molded blocks 3 the delivery according to the invention on their side surfaces 14 . 15 mortared with a mortar of refractory material, from which mortar joints 38 result.

A particular embodiment of the invention provides for the use of a mortar which scales at about 800 ° C. The scaling can be done before using the burner lance 1 or done in situ by the temperature load in the rotary kiln.

Scaling mortars are known. They are used for mortaring of refractory shaped bricks and have before their scaling, for example, the following components: Wt .-% component 5-20 Al (aluminum) 5-20 _MgSO4 -7 FeO + Al ₂ O ₃ -5 FeO × Fe ₂ O ₃ (magnetite) 20-70 MgO (periclase) 5-30 Fe ₂ O ₃ (hematite) -9 MgO × Al ₂ O ₃ (spinel)

When scaling such mortar very high temperatures arise up to, for example, 2000 ° C, where the refractory material of the mortar and adjacent surface areas of the stones 3 sinter or melt, resulting in a ceramic bond.

The invention provides for the first time to use pressed and fired and refractory bricks made of refractory material for the external delivery of the head zone of a burner lance and allows easy installation and ensures high chemical and temperature resistance and high durational punching strength of the head zone. The form stones 3 are, for example, magnesia spinel stones or high clay earth-containing shaped blocks with SiC.

The dimensions of the stones 3 are for example: Length: 180-220 mm Width above: 106-114 mm Width down: 76-84 mm Height: 86-94 mm

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DD 223802 A1 [0002]
• - DE 20303937 U1 [0003, 0021]
• - DE 29911973 U1 [0003]
• - DE 19737303 A1 [0003]

Claims (14)

Outer lining of a jacket pipe ( 2 ) of a burner lance ( 1 ) for rotary kilns, z. Cement rotary kilns, with prefabricated refractory moldings in a front firelit burner lance head zone ( 4 ) and a refractory monolithic material ( 5 ), z. B. refractory concrete, in a less fire-loaded rear burner lance zone ( 6 ) characterized by a refractory lining as outer lining in the burner lance head zone ( 4 ) with prefabricated pressed and fired refractory shaped bricks ( 3 ), one on the jacket tube ( 2 seated delivery ring ( 10 . 11 ) around the jacket tube ( 2 ) are arranged around one another lined up, one on the jacket tube ( 2 ) fixed retaining element ( 21 ) each two opposing molded blocks ( 3 ) holds in pairs, so that twice as many shaped stones ( 3 ) like holding elements ( 21 ) in a delivery ring ( 10 . 11 ) are present, and wherein each retaining element ( 21 ) Proportionally in each a spatially adapted recess ( 20 ) of the two shaped stones ( 3 ) of the shaped stone pair is received and undercut-like engaging behind holding means ( 18 . 24 . 25 ; 34 . 37 ) between the retaining element ( 21 ) and the recesses ( 20 ) of the two shaped stones ( 3 ) are provided. External cladding according to claim 1, characterized in that the shaped blocks ( 3 ) are trapezoidal in cross-section and a narrower bottom surface ( 10 ), a wider outer surface ( 13 ), two oblique, to the bottom surface converging side surfaces ( 14 . 15 ) and two end faces ( 16 . 17 ), wherein in one of the side surfaces ( 14 or 15 ) the recess ( 20 ) is arranged. External cladding according to claim 1 and / or 2, characterized in that the recess ( 20 ) to the bottom surface of a molded block ( 3 ) forming a gap and, in particular, viewed in the plan view of the side surface, is dovetail-shaped, wherein two laterally opposite, downwardly converging abutment surfaces ( 18 ) formed in spaced-apart, gap-forming abutment surfaces (FIGS. 19 ) pass over. Outer lining according to claim 2 and / or 3, characterized in that the other recess-free side surface ( 14 or 15 ) is formed continuously planar. External cladding according to claim 3 and / or 4, characterized in that the retaining element ( 21 ) a foot plate ( 22 ), one of the foot plate ( 22 ) projecting web ( 23 ) and two from the jetty ( 23 ) outgoing, diverging obliquely upwardly extending abutment arms ( 24 . 25 ) having. Outer lining according to claim 5, characterized in that the width of the abutment arms ( 24 . 25 ) the length of the foot plate ( 22 ), wherein a narrow web ( 23 ) at the edge of the foot plate ( 22 ), which is only about one quarter of the width of the abutment arms ( 24 . 25 ), from which a cut-out ( 26 ) above the foot plate ( 22 ) and below the cutout ( 26 ) a slot ( 27 ) in the foot plate ( 22 ) is introduced. Outer lining according to one or more of claims 1 to 6, characterized in that the holding means of the holding element ( 21 ) is formed in longitudinal section Y-shaped or arcuate or trapezoidal or dovetailed or the like. Outer lining according to claim 1 and / or 2, characterized in that a two-part holding element ( 21 ) is provided, the upright in the welded state holding element plate ( 30 ) of metal, whose head area ( 32 ) expediently an arcuate outer edge and a hole ( 33 ), wherein in the hole ( 33 ) expediently in the direction of the foot area ( 31 ) arcuately curved bolt ( 34 ) is loosely inserted and the plate plane of the holding element plate ( 30 ) in the direction of a longitudinal surface line of the jacket tube ( 2 ). External cladding according to claim 8, characterized in that the side edges ( 35 ) of the holding element plate ( 30 ) aligned parallel to one another or in the direction of the head region ( 32 ) are formed converging. External cladding according to claim 8 and / or 9, characterized in that the recess ( 20 ) archway-shaped and to the flat side or broad side shape of the plate ( 30 ) of the retaining element ( 21 ) and in the recessed back surface ( 36 ) of the recess ( 20 ) in the arc region of the recess ( 20 ) a blind hole ( 37 ) is inserted, into which the bolt ( 34 ) can intervene. Exterior cladding according to one or more of claims 1 to 10, characterized in that the shaped stones ( 3 ) of delivery to their side surfaces ( 14 . 15 ) are mortared together with a mortar of refractory material, from which mortar joints ( 38 ) result. Outer lining according to claim 11, characterized characterized in that the composition of the mortar at high temperatures from z. B. 800 ° C formed verzallernd is. External cladding according to claim 12, characterized in that the mortar before its scaling comprises the following components: Wt .-% component 5-20 Al (aluminum) 5-20 _MgSO4 -7 FeO + Al ₂ O ₃ -5 FeO × Fe ₂ O ₃ (magnetite) 20-70 MgO (periclase) 5-30 Fe ₂ O ₃ (hematite) -9 MgO × Al ₂ O ₃ (spinel) Exterior cladding according to one or more of claims 1 to 13, characterized in that the refractory material of the mortar and adjacent material of the surface areas of the molded blocks ( 3 ) are sintered or fused and form a ceramic bond.