Boiler wall protection block, boiler wall protection element, assembly of such element and a ferrule, a boiler wall provided with such assembly, method for furnishing a boiler inner wall and a boiler wall protection sub-block

Abstract

A boiler tube protection block, comprising an essentially parallellogram shaped body (11), an annular cut-out at all four corners, with the cutting point of two adjacent sides as a center. An assembly of a boiler protection block and a ferrule (21) with a radius essentially corresponding to the central annular hole of the block. A boiler, and a method for furnishing a boiler inner wall, comprising applying protection blocks against the wall, and arranging ferrules through at least the annular cut-outs.

Claims

1. A boiler wall protection block for building a boiler wall, comprising: an essentially parallelogram shaped body; and an annular cut-out at all four corners, with the cutting point of two adjacent sides as a centre, wherein each of the annular cut-outs is arranged to receive at least part of a ferrule; wherein the protection block and the ferrule are distinct, non-integrated structures; and wherein each side of the protection block has a protrusion corresponding to a recess in a neighboring protection block and a recess corresponding to a protrusion in the neighboring protection block preventing direct radiation of heat from reaching the boiler wall.

2. The boiler wall protection block according to claim 1, wherein a first pair of adjacent sides are at an angle of 60 degrees, and a second pair of adjacent sides are at 120 degrees.

3. The boiler wall protection block according to claim 1, wherein a first pair of adjacent sides and a second pair of adjacent sides are all at 90 degrees.

4. The boiler wall protection block according to claim 1, wherein all sides are of equal size.

5. The boiler wall protection block according to claim 1, manufactured of one or more compounds selected from the group consisting of Al2O3, ZrO2, SiO2, TiO2, Y2O3, Na2O, Nb2O5, La2O3, Fe2O3, CaO, SrO, CeO2, MgO, Cr2O3, CuO, the mixed oxides thereof, SiC, TiC, Si3N4 and AlN.

6. A boiler wall protection element having four boiler wall protection blocks according to claim 1, comprising: a central annular through hole for the ferrule; an annular cut-out at the middle of all four sides, with the centre coincident with the side; wherein the central annular through hole and the annular cut-outs at the middle of the four sides have the same radius as the annular cut-out at all four corners.

7. An assembly of a boiler protection element according to claim 6 and the ferrule with a radius corresponding to the central annular hole of the boiler protection element.

8. The assembly according to claim 7, wherein the ferrule comprises a six-sided flange.

9. The assembly according to claim 7, comprising a heat-resistant paper gasket between the boiler wall protection blocks.

10. A boiler wall, comprising an assembly according to claim 7.

11. The boiler wall according to claim 10, comprising a double layer of boiler wall protection blocks, wherein the boiler wall protection blocks of the different layers have a 120 degree different orientation.

12. The boiler wall protection block according to claim 1, wherein each protrusion and recess extends over about half of the thickness of the protection block.

13. The boiler wall protection block according to claim 1, wherein each protrusion and recess extends along an entire side of the protection block preventing direct radiation of heat from reaching the boiler wall.

14. The boiler wall protection block according to claim 1, wherein a paper gasket is positioned between each protrusion and recess of the protection block.

15. The method according to claim 1, wherein adjacent boiler wall protection blocks lock each other together in a roofing-tile wise manner.

16. A method for furnishing a boiler inner wall, comprising: applying boiler wall protection blocks against the wall, and inserting ferrules through annular cut-outs of the boiler wall protection blocks to secure the boiler wall protection blocks, wherein the protection blocks and the ferrules are distinct, non-integrated structures, and wherein each of the protection blocks has an essentially parallelogram shaped body f with the annular cut-outs at all four corners, with the cutting point of two adjacent sides as a centre, wherein each side of the protection block has a protrusion corresponding to a recess in a neighboring protection block and a recess corresponding to a protrusion in the neighboring protection block preventing direct radiation of heat from reaching the boiler wall.

17. The method according to claim 16, comprising applying multiple layers of boiler wall protection blocks, wherein blocks of adjacent layers have a mutually different orientation.

18. The method according to claim 16, wherein each protrusion and recess extends along an entire side of the protection block preventing direct radiation of heat from reaching the boiler wall.

19. The method according to claim 16, comprising positioning a paper gasket between each protrusion and recess of the protection block.

20. A boiler wall protection sub-block, comprising a part of a boiler wall protection block wherein the part corresponds to a section of the boiler wall protection block from one annular cut-out to an adjacent one or to a section of the block from one annular cut-out to an opposite one, wherein each of the annular cut-outs is arranged to receive at least part of a ferrule, wherein the part of the boiler wall protection block and the ferrule are distinct, non-integrated structures, and wherein the protection block has an essentially parallelogram shaped body of which with the annular cut-outs at all four corners, with the cutting point of two adjacent sides as a centre, wherein each side of the protection block has a protrusion corresponding to a recess in a neighboring protection block and a recess corresponding to a protrusion in the neighboring protection block preventing direct radiation of heat from reaching the boiler wall.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will now be explained into more detail with reference to the following figures. Herein:

(2) FIG. 1 shows a first embodiment of a block according to the invention;

(3) FIG. 2 shows a second embodiment of a block according to the invention;

(4) FIGS. 3a, b show a combination of a block according to the invention and a ferrule;

(5) FIG. 4a shows a composition of multiple blocks and ferrules according to the invention;

(6) FIG. 4b shows the use of paper gaskets between blocks.

(7) FIG. 5 shows a method for decomposing a composition from FIG. 5;

(8) FIG. 6 shows how a double layered boiler wall protection may be arranged;

(9) FIG. 7 shows an alternative embodiment of a block according to the invention;

(10) FIG. 8 shows a composition of multiple blocks according to claim 7; and

(11) FIG. 9 shows some examples of boiler tube protection sub-blocks.

DETAILED DESCRIPTION OF THE INVENTION

(12) FIG. 1 shows a first embodiment 1 of a block according to the invention. The block comprises an essentially lozenge shaped body 2, with an annular cut-out 3, 4, 5, 6 at all four corners, with the cutting point A, B, C, D of two adjacent sides 7, 8, 9, 10 as a centre.

(13) FIG. 2 shows a second embodiment 11 of a block according to the invention, having a central annular through hole 12 for a ferrule, and annular cut-outs 13, 14, 15, 16 at the middle of all four sides, with the centre coincident with the side 17, 18, 19, 20.

(14) FIGS. 3a and b show different perspectives of a combination of a block 11 according to the invention and a ferrule 21. As can be seen in FIG. 3b, the annular holes and cut-outs are arranged such that adjacent six-sided flanges of ferrules fill the entire surface. The annular through hole and the annular cut outs have a rounded edges 22.

(15) FIG. 4a shows a composition 30 of multiple blocks 31 and ferrules 32 according to the invention. In this example, the ferrules 32 have annular flanges instead of the six-sided ones as shown in FIGS. 3a, 3b. The blocks 31 are provided with recesses 33 for receiving the annular flanges of the ferrules 31. Also visible in FIG. 4 is that two adjacent sides of the blocks 31 have a protrusion 34, and the two other adjacent sides have a corresponding recess 35. In the example given, the protrusions 34 and recesses 35 extend over about half the thickness of the block.

(16) FIG. 4b shows the use of paper gaskets 36 between the blocks 31, for obtaining a gas-tight connection. The paper may for instance be 2 or 3 mm thick in an uncompressed state, and 1 mm in a compressed state.

(17) FIG. 5 shows a method for decomposing a composition from FIG. 5. After removing the ferrules, one of the blocks 41 may be moved in the direction of arrow E, and subsequently the adjacent ones 42 may be moved in direction F. Then, the block 41 may be lifted and taken out.

(18) FIG. 6 shows how a double layered boiler wall protection may be arranged. Blocks 50 form a first layer, with a first length orientation G, while block 51 of a second layer is placed with length orientation H.

(19) FIG. 7 shows an alternative embodiment 60 of a block according to the invention. The block comprises an essentially square body 61, with an annular cut-out 62, 63, 64, 65 at all four corners, with the cutting point A, B, C, D of two adjacent sides 66, 67, 68, 69 as a centre.

(20) FIG. 8 shows a composition 70 of multiple blocks 71 and ferrules 73 according to the invention. In this example, the ferrules 73 have annular flanges. The blocks 71 are provided with recesses for receiving the annular flanges of the ferrules 73. Also visible in FIG. 8 are the paper gaskets 72 used for obtaining a gas-tight connection.

(21) FIG. 9 shows some examples of boiler tube protection sub-blocks 80-85, comprising a part of a boiler tube protection block from FIG. 1. The parts 80, 81 correspond to a section of the block from one annular cut-out to an adjacent one. The parts 82, 83 and 84, 85 respectively corresponds to a section of the block from one annular cut-out to an opposite one. These boiler tube protection sub-blocks may be manurefactured for the ease of production, or placement of the blocks. Besides the examples given, other sections are thinkable too. The same goes for sub-blocks for forming a boiler tube protection block as shown in FIG. 2.

(22) Besides the examples shown, multiple variations are possible, all falling within the scope of the present application, as determined by the following claims.