WO2016109904A1

WO2016109904A1 - Fireproof wall, in particular for a combustion furnace

Info

Publication number: WO2016109904A1
Application number: PCT/CH2016/000004
Authority: WO
Inventors: Tobias Kern
Original assignee: Mokesys Ag
Priority date: 2015-01-07
Filing date: 2016-01-06
Publication date: 2016-07-14
Also published as: EP3243027A1; PL3243027T3; EP3243027B1; CH710597A1; ES2703583T3; DK3243027T3

Abstract

The invention relates to a fireproof wall, comprising a boiler wall (1) and a protective cladding (2) positioned in front thereof made of a plurality of fireproof plates (21, 22). The fireproof wall has a rear-ventilated wall section, in the region of which an intermediate space (3) is present between the boiler wall (1) and the protective cladding (2). Gas supply means for supplying a protective gas to the intermediate space (3) comprise a gas distribution channel (K) and at least one gas supply line (52) for supplying protective gas to the gas distribution channel. The gas distribution channel (K) is arranged at the lower end of the rear-ventilated wall section, and below the gas distribution channel (K), there is no rear-ventilated wall section. The gas distribution channel (K) is arranged on the same side as the protective cladding (2) with respect to the boiler wall (1), and extends transversely across the protective cladding (2). The gas distribution channel (K) is communicatively connected to the intermediate space (3), continuously over the length of the gas distribution channel, or at several discrete points communicatively with the intermediate space (3), between the part of the protective cladding (2) located above the same and the boiler wall (1).

Description

Fireproof wall, in particular for a combustion furnace

The invention relates to a refractory wall, in particular for a

Incinerator, according to the preamble of patent claim 1.

Such refractory walls are e.g. used in combustion chambers of combustion plants. The boiler wall is often designed as a metal pipe wall and is usually made of webs connected by pipes. The projecting in the distance to the pipe wall refractory protective cover is the pipe wall before

Protect corrosion by flue gases. The refractory protective cover is usually formed in rows and columns next to or above one another arranged plates. Refractory walls are e.g. also used in fluidized bed ovens, where the boiler wall consists of a more or less thick simple metal wall. Again, the boiler wall or metal wall to be protected from corrosion.

The panels of the protective covering are usually sealed to each other to a certain extent by various measures to prevent the passage of

Prevent flue gases. However, in practice this alone can not completely avoid that corrosive flue gases can pass through the protective cover and attack the boiler wall.

So-called ventilated wall systems address this problem by the fact that a protective gas - generally air - is pumped through the space between the boiler wall and the distance superior protective lining. The gas or air is in this case with respect to the combustion chamber under a slight overpressure, which prevents the flue gases from penetrating from the combustion chamber into the wall space and can attack the boiler wall or other metal parts.

A generic refractory wall is described for example in document CH 699 406 A2. In this so-called ventilated fire-resistant wall, the Air supply or more generally the supply of inert gas into the space between the boiler wall and the protective cover by a plurality of distributed at the lower end of the refractory wall across this

Inlet openings in the boiler wall, which are fed from the non-fire side of the refractory wall ago from at least one supply channel. The inlet ports are located in the vessel wall in the area of vertically continuous grooves of the plates of the protective shroud, so that the gas or air (from the side) is primarily supplied to these grooves and can spread over these throughout the wall. For better lateral distribution of the gas or the air, either the panels of the protective covering itself are provided with transverse channels or are individual horizontal rows of panels at certain vertical intervals, e.g. each 2-4 m, arranged at a slightly greater distance from the boiler wall than the other plates, so that horizontal transverse channels are formed over which the gas or the air can spread over the wall width.

The introduction of the gas or the air into the space between the boiler wall and the protective lining described in document CH 699 406 A2 has, inter alia, the disadvantage that transverse channels in the plates are required for adequate distribution over the wall width, which requires additional design effort either with respect to the plates themselves or their arrangement. Further, the feeding of the gas or air into the plates from the side into the grooves has not proved to be optimal. In addition, the boiler wall must be pierced at a variety of locations of inlet openings.

In view of these disadvantages of this known refractory wall, the invention has for its object to improve a refractory wall of the generic type with respect to the supply of protective gas or air in the space between the boiler wall and the protective panel.

This object is achieved by the inventive refractory wall, as defined in the independent claim 1. Particularly advantageous developments and refinements of the invention will become apparent from the dependent

Claims. The essence of the invention consists in the following: A refractory wall, in particular for a combustion furnace comprises a boiler wall and at a distance from this superior refractory protective covering of a plurality of juxtaposed and stacked in rows and columns refractory plates, each having at least one Plate holder are fixed to the boiler wall, wherein the refractory wall has a ventilated wall portion, in the region between the boiler wall and the protective cover a gap is present, and wherein the refractory wall comprises gas supply means for supplying a protective gas in the intermediate space. The gas supply means comprise a gas distribution channel and at least one gas supply line for supplying inert gas in the

Gasverteilkanal. The Gasverteilkanal is arranged with respect to the installation position of the refractory wall at the lower end of the ventilated wall portion and below the Gasverteilkanals is not a ventilated wall section. Of the

Gas distribution channel is with respect to the boiler wall on the same side as the

Protective cover arranged and extends across the protective cover. The Gasverteilkanal is communicating over its length continuously or at several discrete locations with the space between the above him

connected part of the protective covering and the boiler wall.

The arrangement of a Gasverteilkanals immediately below the ventilated wall section and the direct feed of the inert gas from below from the Gasverteilkanal in the space between the above him part of the protective cover and the boiler wall results in an optimal distribution of the protective gas in the ventilated wall section over the entire wall width.

According to an advantageous embodiment, the gas distribution channel is formed by a gas distribution box into which the at least one gas supply line opens. Such a gas distribution box is easy to implement and quick to install.

Preferably, the gas distribution box has a plurality of gas outlet openings, which in the space between the boiler wall and the Open protective cover. By the majority of Gasaustassöffhungen an optimal protective gas distribution can be achieved.

According to another advantageous embodiment of the gas distribution channel is formed by at least one row of juxtaposed and spaced from the vessel wall refractory plates. This has the advantage that the

Gas distribution channel can be realized without special additional construction elements.

Conveniently, the gas distribution channel is limited on one side by the boiler wall. By using the existing boiler wall as Gasverteilkanalwand the gas distribution channel is easier and cheaper to produce.

In an advantageous embodiment, the at least one opens

Gas supply line laterally through the boiler wall into the gas distribution channel. The gas supply line can be made so short.

According to a further advantageous embodiment variant, the at least one gas supply line opens from below into the gas distribution channel, wherein expediently the at least one gas supply line is guided through the boiler wall below the gas distribution channel and then between the boiler wall and the

Protective cover runs upward and opens into the gas distribution channel. This has the advantage that the location of the passage of the protective gas through the boiler wall can be determined independently of the position of the Gasverteilkanals.

Advantageously, the boiler wall is designed as a pipe wall with pipes connected by webs.

Conveniently, the boiler wall in the area of the ventilated

Wall section above the Gasverteilkanals no gas supply lines to

Supply of gas in the space on. In the following the invention will be described in more detail with reference to exemplary embodiments illustrated in the drawing. Show it:

1 shows a schematic interior view of a combustion furnace with a refractory wall according to the invention,

Fig. 2 is a fragmentary sectional view of the refractory wall according to the

Line 11-11 of FIG. 1,

Fig. 3 is a fragmentary sectional view of the refractory wall according to the

Line III-III of Fig. 2,

4 is a view of a portion of the refractory wall in the direction of

Arrow IV of Fig. 1,

Fig. 5 - a fragmentary sectional view analogous to Fig. 2 of a second

Exemplary embodiment of the inventive refractory wall,

Fig. 6 is a fragmentary sectional view of the refractory wall according to the

Line VI-VI of Fig. 5,

Fig. 7 is a fragmentary sectional view of the refractory wall according to the

Line VII-V1I of Fig. 6,

Fig. 8 - a fragmentary sectional view analogous to Fig. 2 of a third

Exemplary embodiment of the refractory wall according to the invention,

9 is a fragmentary sectional view of the refractory wall according to FIG

Line ΓΧ-ΙΧ of Fig. 8,

10 is a fragmentary sectional view of the refractory wall according to FIG

Line XX of FIG. 9 or FIG. 12, Fig. 1 1 - a partial sectional view analogous to Fig. 2 of a fourth

Embodiment of the inventive refractory wall and

Fig. 12 is a fragmentary sectional view of the refractory wall according to the

Line X1I-XII of Fig. 1 1.

The following definition applies to the following description: If reference signs have been given in a figure for the purpose of clarity of drawing, but are not mentioned in the directly related part of the description, reference will be made to them

Explanation referenced in the preceding or following parts of description. Conversely, less relevant reference numerals are not included in all figures to avoid superimposed drawing overhead for the immediate understanding. For this purpose, reference is made to the other figures. Location and direction designations, such as up, down, side by side,

one above the other, side, vertical, horizontal, height and width refer to the usual, shown in the drawing vertical position of the refractory wall.

1 schematically shows a combustion furnace V equipped with a refractory wall W according to the invention. The wall W is in an upper,

ventilated wall section W | and a lower, back-poured wall section W ₂ articulated. Between the two wall sections Wi and W ₂ or at the lower end of the ventilated wall section W | extends over the entire wall width extending Gasverteilkanal K, which will be discussed in more detail below. The wall W comprises a boiler wall 1 (FIG. 2) which is not visible in FIG. 1 and a protective covering 2 which is at a distance from it and which consists of a multiplicity of refractory plates arranged side-by-side and one above the other in rows and columns. The plates in the ventilated wall section W | are designated at 21, while the plates of the lower wall portion W ₂ are denoted by 22. The plates 21 and 22 are, for example, ceramic SiC plates, preferably SiC 90 plates having an SiC content of about 90% in the production, which are fire resistant up to over 1000 ° C. The over the ventilated wall section Wi and the hintergossenen

Wall section W ₂ continuous boiler wall 1 is formed as a tube wall and consists of a plurality of vertical use in practice pipes 1 1, which are held together by webs 12 at a mutual distance (see

in particular Fig. 4). The tubes 1 1 and the webs 12 are usually made of steel. On the side facing away from the protective panel 2 of the boiler wall 1, a boiler insulation 15 is attached (Fig. 2).

The plates 21 and 22 of the protective cover 2 are attached to the boiler or pipe wall 1 by means (here four in the example) plate mounts 13. The

Plate mounts 13 are made of heat resistant steel, e.g. Steel no. 310 according to AISI standard or material no. 1.4845 according to DIN 17440. The plate holders 13 essentially comprise in each case one bolt welded to a web 12 and one nut sitting on the bolt. The plate holders 13 engage in vertically continuous, inwardly widened grooves 21a (FIG. 4) and 22a (FIG. 10) of the plates 21 and 22, respectively, and set the spacing of the plates 21 and 22

Pipe wall I firmly. The plate supports 13 also serve to support the plates 21 and 22 in the vertical direction, the plates 21 and 22 with arranged on them (molded) bridge elements (brackets) 21b and 22b rest on the plate brackets 13. The plates 21 and 22 are movable in the vertical direction to some extent so as to thermally induced expansion or. Allow contraction movements. Between the side by side

arranged plates 21 and 22 extend undeclared vertical joints and between the superposed plates 21 and 22 are not designated horizontal joints. The joints are in a conventional manner by inserted sealing elements and / or an overlapping formation of

Plate edges sealed.

The protective cover 2 is at a certain distance from the boiler wall or

Pipe wall 1 is arranged so that between the plates 21 and 22 of the

Protective cover 2 and the boiler wall 1 each have a gap 3 and 4 respectively. In the upper, ventilated wall section W _t , the gap 3 is empty, in the lower, back-poured wall section W ₂ , the gap 4 with a refractory potting filled. Likewise, in this lower wall section W ₂ , the vertically continuous grooves 22a of the plates 22 are also filled with the potting compound (FIG. 10).

With the exception of the above-mentioned Gasverteilkanals K and related, yet to be described construction elements, the refractory wall according to the invention in its basic structure conventional refractory walls of this type, so far as the expert closer none

Explanation is needed.

The essential difference of the inventive refractory wall over conventional refractory walls of this type is the implementation of the air or general inert gas feed into the ventilated wall portion Wi of the refractory wall W. According to the most essential idea of the invention, the refractory wall with the already above mentioned, on the same side of the boiler wall 1 as the protective cover 2 arranged gas distribution channel K equipped, which extends at the lower end of the ventilated wall portion W] across the width of the wall. The gas distribution channel K is connected via lines still to be explained to a protective gas or air source and is continuous over its length or at several discrete locations in

communicating connection with the gap 3 between the located above him part of the protective cover 2 and the boiler wall 1, so that from the Gasverteilkanal K air or inert gas from below directly into the gap 3 between the boiler wall 1 and the plates 21 of the protective cover. 2 can be fed.

In the following, four exemplary embodiments of the refractory wall according to the invention will be explained in more detail, which are primarily only by the formation of the

Gas distribution channel K and the type of protective gas supply into the gas distribution channel K differ. The remaining structure of the refractory wall is at all four

Exemplary embodiments basically as already described above, so that will not be discussed in more detail. In the first embodiment of the illustrated in Figures 2-4

inventive refractory wall of the gas distribution channel K is formed by a rectangular cross-section gas distribution boxes 5, which is disposed between the bottom row of plates 21 and the top row of plates 22 and terminates substantially flush with the outer surface of the protective cover 2. On its inside is preferably made of metal

Gas distribution box 5 limited by the boiler wall 1 and attached to this

(Welded). At the upper boundary wall of the gas distribution box 5, this has a plurality of distributed over its entire length (width of the wall) arranged gas outlet openings 51, which open from below into the gap 3 between the boiler wall 1 and the plates 21 of the protective cover 2 and the

Connecting interior of the gas distribution box communicating with the gap 3. For supplying protective gas or air into the gas distribution box 5 or gas distribution channel K, a plurality of gas supply lines 52 are preferably provided, which are passed through the boiler insulation 15 and the boiler wall 1 and open into the interior of the gas distribution box 5. The gas supply lines 52 are in operation with a symbolic only indicated by the arrow Q Schutzgasbzw. Air source connected.

Compared with the above and below the Gasverteilkastens 5 adjacent plates 21 and 22, the gas distribution box 5 by means of sealing elements, for example

Sealing cords 55 sealed.

The third Ausftihrungsbeispiel the illustrated in Figures 8-10

Refractory wall according to the invention differs from the just described first exemplary embodiment only by the way in which the protective gas is fed into the gas distribution box 5. The gas supply takes place from below into the

Gas distribution box 5 by means of several gas supply lines, each having a vertical portion 53 a and a substantially horizontal portion 53 b. The vertical sections 53a of the gas supply lines run parallel to the boiler wall 1 through part of the back-poured wall section W ₂ and open from below into the gas distribution box 5 (FIG. 8). The horizontal sections 53b of

Gas supply lines enforce similar to the gas supply lines according to FIG. 2 the kettles wall 1 and the boiler insulation 15 (not shown) (Figure 10). The length of the vertical sections 53a of the gas supply lines can be several meters, as can be seen for example from FIG. 1, where the vertical sections 53a of the gas supply lines extend into the lower region of the lower, back-poured wall section W ₂ .

FIGS. 5-7 show a second exemplary embodiment of the refractory wall according to the invention, which is primarily determined by the implementation of the invention

Gas distribution channel of the two embodiments just described differs. The here with K 'designated gas distribution channel is here integrated directly into the protective cover 2 and between the boiler wall 1 on the one hand and a number of (non-cast) plates 23 on the other hand formed. Downstream of the Gasverteilkanal K 'is limited by the top row of the back-cast plates 22 of the lower wall portion W ₂ , and above the Gasverteilkanals K immediately adjoins the bottom row of plates 21 of the rear-ventilated wall portion Wj.

The plates 23 in the region of the gas distribution channel K 'are preferably of the same design and are fastened to the vessel wall 1 as the plates 22 of the back-poured wall section W ₂ , except that they are thinner (in the direction perpendicular to their surface). Plate holders 13 engage in vertically continuous, inwardly widened grooves 23a (FIG. 7) of the plates 23 and fix their distance from the tube wall 1. The plate supports 13 also serve to support the plates 23 in the vertical direction, the plates 23 with them arranged (molded) bridge elements (consoles) 23 b (Figures 5 and 6) on the

Plate holders 13 rest. In contrast to the plates 22 of the lower wall portion W ₂ , the plates 23 are not cast-in. They are also less thick or deep formed as the plates 21 of the ventilated wall portion Wi.

Due to the smaller thickness or depth of the plates 23 in the region of

Gasverteilkanals K 'is their distance from the boiler wall 1 significantly larger, so that between the row of plates 23 and the boiler wall 1, a relatively large free space, which forms the gas distribution channel K', in which the protective gas is relatively unhindered over the entire width the refractory wall can distribute. Of course it is also possible in the field of

Gasverteilkanals K 'other, especially even less deep plates

if they allow only the formation of a Gasverteilkanals sufficiently large cross-sectional dimensions.

The supply of inert gas in the gas distribution channel K 'is carried out as in

Exemplary embodiment of Figures 2-4 from the side by means of several, the

Boiler insulation 15 and the boiler wall 1 penetrating gas supply lines 52, which open directly into the gas distribution channel K '.

The illustrated in Figures 10-12 fourth exemplary embodiment of

inventive refractory wall differs from the just described third exemplary embodiment only by the type of supply of the protective gas in the Gasverteilkanal K \ The gas supply takes place here similar to the second

Execution example according to the figures 8-10 from below into the gas distribution channel K 'by means of several gas supply lines, each having a vertical portion 53a and a substantially horizontal portion 53b. The vertical sections 53a of the gas supply lines run parallel to the boiler wall 1 through part of the back-poured wall section W ₂ and open from below into the gas distribution channel K '(FIG. 11). The horizontal sections 53b of

Gas supply lines, similar to the gas supply lines 52 according to FIG. 2, pass through the boiler wall 1 and the boiler insulation 15 (not shown) (FIG. 10).

As already mentioned, the boiler wall of the refractory wall according to the invention does not have to be formed as a tube wall, but may, for example, also be a normal metal wall, on which the plate holders 13 are arranged and fastened analogously to the tube wall described above.

Claims

claims

1. Refractory wall (W), in particular for a combustion furnace, with a boiler wall (1) and at a distance from this superior refractory

Protective covering (2) of a multiplicity of refractory plates (21, 22, 23) arranged in rows and columns, which are fastened to the boiler wall (1) via at least one plate holder (13), wherein the refractory wall ( W) has a ventilated wall section (Wi), in the region between the boiler wall (l) and the protective cover (2) has a gap (3) is provided, and wherein the refractory wall (W) gas supply means for supplying a protective gas in the intermediate space ( 3), characterized in that the gas supply center 1 a Gasverteilkanal (K; K ') and at least one

Gas supply line (52; 53a, 53b) for supplying protective gas into the gas distribution channel (K; K '), the gas distribution channel (K; K') with respect to the installation position of the refractory wall (W) at the lower end of the ventilated wall portion (W _t ) is arranged and below the Gasverteilkanals (K; KZ) is not a ventilated wall section, wherein the gas distribution channel (K; K ') with respect

Boiler wall (1) is arranged on the same side as the protective covering (2) and extends across the protective covering (2) and wherein the Gasverteilkanal (K; K ') over its length continuously or at a plurality of discrete locations

communicating with the intermediate space (3) between the above him part of the protective covering (2) and the boiler wall (1) is connected.

2. Fireproof wall according to claim 1, characterized in that the

Gas distribution channel (K) by a gas distribution box (5) is formed, in which the at least one gas supply line (52; 53a, 53b) opens.

3. Refractory wall according to claim 2, characterized in that the

Gas distribution box (5) has a plurality of gas outlet openings (51), which open into the intermediate space (3) between the boiler wall (1) and the protective cover (2).

4. Refractory wall according to claim 1, characterized in that the

Gas distribution channel (Κ ') through at least one row of side by side and in

Distance from the boiler wall (1) arranged refractory plates (23) is formed.

5. Fireproof wall according to one of the preceding claims, characterized

characterized in that the Gasverteilkanal (K, K ') is bounded on one side by the boiler wall (1).

6. Fireproof wall according to one of the preceding claims, characterized

characterized in that the at least one gas supply line (52) through the

Kesselwand (1) through the gas distribution channel (K; K ') opens.

7. Refractory wall according to one of claims 1-5, characterized in that the at least one gas supply line (53a, 53b) opens from below into the gas distribution channel (K; K ').

8. Refractory wall according to claim 7, characterized in that the at least one gas supply line (53a, 53b) below the Gasverteilkanals (K; K ') is passed through the boiler wall (1) and then between the boiler wall (1) and the protective covering ( 2) runs upwards and flows into the gas distribution channel (K; K ').

9. Fireproof wall according to one of the preceding claims, characterized

in that the boiler wall is designed as a pipe wall (1) with pipes (1 1) connected by webs (12).

10. Fireproof wall according to one of the preceding claims, characterized

characterized in that the boiler wall (1) in the area of the back-ventilated

Wall section (WO above the Gasverteilkanals (K, K ') has no gas supply lines for supplying gas into the intermediate space (3).