JP3122422B2 - Water pipe protection refractory structure and method of assembling the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water tube protection refractory structure for protecting a water tube of a heat exchanger such as a water tube of a boiler from a high-temperature gas atmosphere, and a method of assembling the same.

[0002]

2. Description of the Related Art In a waste heat recovery boiler, a water pipe for heat transfer is protected by a refractory block from heat and corrosive atmosphere transmitted from combustion gas.

FIGS. 5 to 7 show a prior art provided in Japanese Patent Application Laid-Open No. Hei 10-54506 as such a fire-resistant structure for protecting a water pipe for a waste heat recovery boiler, and FIG. 5 is a schematic view from the fire-resistant block side. FIG. 7 is a front view and FIG. 7 is a cross-sectional view taken along line CC of FIG.

In FIGS. 5 to 7, reference numeral 14 denotes a water pipe of a boiler, and 15 denotes a flat rib for connecting the water pipes 14 in a horizontal direction or a vertical direction to reinforce the water pipes. Make up the body 16. 18b
Is a supporting refractory block made of a ceramic material provided so as to cover the water pipe assembly 16 from the combustion gas 50. 19 is a bolt for fixing the supporting refractory block 18b to the flat rib 15 of the water pipe assembly 16, and the bolt 19 is erected from the plate surface of the flat rib 15 through the supporting refractory block 18b, By tightening the nut 20 screwed to the bolt 19, the supporting refractory block 18b is fixed to the water pipe assembly 16.

Reference numeral 21 denotes a cap fixed to the refractory block 18b. The cap 21 is placed over the nut 20 so as to protect the head of the bolt 19, that is, the threaded portion of the nut 20 from the combustion gas 50. ing. A mortar 13 is filled in a space formed between the inside of the refractory block 18b, the outside of the planar rib 15, and the outside of the water pipe 14. Between the mortar 13 and the inside of the supporting refractory block 18b and between the refractory blocks 18b, a cushion material for absorbing a difference in thermal expansion between the water pipe assembly 16 and the supporting refractory block 18b is provided. 12 are filled.

[0006]

However, such a conventional technique has the following problems.
That is, during the operation of the waste heat recovery boiler, when the temperature of the bolt 19 becomes high, the bolt expands toward the combustion gas 50 due to thermal expansion, and its head presses the cap 21 so that the cap 21 is moved from the supporting refractory block 18b. take off. As a result, the head of the bolt 19 and the nut 20 are exposed to the combustion gas 50 and corrode. When the corrosion of the bolt 19 and the nut 20 progresses, the tightening force of the supporting refractory block 18b decreases, and This causes the refractory block 18b to fall off or break.

Further, in addition to the above, since the cushioning material 12 having no adhesive strength to the refractory blocks 18b is filled between the support refractory blocks 18b, the adhesive strength between the support refractory blocks 18b is increased. When the tightening force of the bolt 19 and the nut 20 decreases as described above, the supporting refractory block 18b easily falls off from the water pipe assembly 16.

The present invention has been made in view of the above-mentioned problems of the prior art, and has been made to prevent the refractory block from falling off or being broken during operation while maintaining the function of absorbing thermal expansion difference between the water pipe assembly and the refractory block by the cushioning material. It is an object of the present invention to provide a water pipe protection fire resistant structure and a method for assembling the same, which prevent the fire and improve the workability of mounting the fire resistant block.

[0009]

According to the present invention, there is provided a water pipe comprising a plurality of water pipes and a flat rib for connecting the water pipes with each other from a combustion gas product. to protect the assembly, the water tube protecting refractory structure interposed resistant fire block between the combustion gas and the water tube assembly, a support arm portion which is erected from said water tube assembly, said support arm A plurality of refractory blocks including at least one supporting refractory block having a support portion engageable with the portion, a peripheral joint portion filled with mortar and joined to form a refractory block group. Via the supporting refractory block, a plurality of refractory blocks integrally formed with a plurality of refractory blocks are supported on the water pipe assembly side, and between adjacent joints between the adjacent refractory blocks. Providing water pipe protecting refractory structure characterized in that it was filled with the cushion material.

In order to protect a water pipe assembly comprising a plurality of water pipes and planar ribs connecting the water pipes from a combustion gas product, the invention according to claim 2 is provided between the water pipe assembly and the combustion gas. A water pipe protection refractory structure having a refractory block interposed therein, the refractory structure including at least one supporting refractory block having a support arm portion erected from the water pipe assembly and a support portion engageable with the support arm portion. A plurality of refractory blocks are filled with mortar in joints around them, and a refractory block group is formed by joining and integrally forming the plurality of refractory blocks. Through the support refractory blocks, a plurality of refractory blocks are integrally formed. A refractory block group, which is supported on the water pipe assembly side, a castable refractory material is installed adjacent to the refractory block group, and a joint between both is filled with the cushion material. That proposes a water pipe protecting refractory structure.

The invention according to claim 3 relates to a method for assembling the refractory structure for protecting a water pipe assembly, wherein the water pipe comprises a plurality of water pipes and a flat rib for connecting the water pipes from a combustion gas product. In order to protect the assembly, a method for assembling a water pipe protecting refractory structure in which a refractory block is interposed between the water pipe assembly and the combustion gas and the water pipe assembly and the refractory block are fixed by mortar. The water pipe assembly further includes a support arm portion erected on the side of the refractory block, wherein the refractory block has at least one support refractory block having a fitting portion to the support arm portion, and a plurality of other refractory blocks. A refractory block group, wherein the supporting refractory block and another refractory block are integrally formed by a mortar joint filled in joints, and a refractory block group integrating step, The block group via a supporting refractory block, characterized in that it and a step of supporting the support arm portion of the water tube assembly.

The invention according to claim 4 is characterized in that the method further comprises a step of filling a cushion material between joints around the adjacent refractory blocks.

According to a fifth aspect of the present invention, there is provided a different form of the fourth aspect of the present invention, wherein a castable refractory material is installed adjacent to the refractory block group, and a joint between the two is filled with the cushion material. It is characterized by having a process.

According to this invention, one or at most about two of the refractory blocks composed of a plurality of refractory blocks are used as supporting refractory blocks, and each of the refractory blocks is filled with mortar at joints between them. By adhering to form a unitary refractory block group, the supporting refractory block in the refractory block group is supported by a support arm fixed to the water tube assembly, thereby absorbing thermal expansion between the refractory block group and the water tube assembly. In addition, the plurality of refractory blocks constituting the refractory block group can be simultaneously fixed to the water pipe assembly with only the one or two support arms.

Thus, the number of supporting arms for supporting can be reduced as compared with the prior art, and the refractory block can be easily assembled, and the number of assembling steps can be reduced.

Further, the support arm for supporting the refractory block group on the water pipe assembly is structured so as not to be exposed to the combustion gas side, so that the support arm and related members are prevented from being corroded by the combustion gas. In addition, it is possible to prevent the refractory block from falling off or being damaged due to such corrosion.

Further, since the cushioning material is filled in each of the refractory blocks composed of a plurality of refractory blocks, unlike the prior art, it is not necessary to provide a cushioning material for each of the refractory blocks. In addition, the number of places where the cushion material is filled is reduced, and the man-hour for the cushion material is reduced.

According to a third aspect of the present invention, in addition to the first aspect, a castable refractory material is provided adjacent to the refractory block group, and a joint between the two is filled with the cushion material.

According to this invention, since the castable refractory material is provided adjacent to the refractory block group, it is possible to prevent combustion gas from entering the support arm from outside the refractory block group.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

FIG. 1 is a schematic front view of a refractory structure for protecting a water pipe of a waste heat recovery boiler according to a first embodiment of the present invention, as viewed from a refractory block side. FIG. 2 is a cross-sectional view taken along line AA of FIG. FIG. 3 is a sectional view taken along line BB of FIG.

1 to 3, reference numeral 14 denotes a water pipe of a boiler, and 15 denotes a flat rib for connecting the water pipes 14 in a horizontal or vertical direction to reinforce the water pipes. Make up the body 16. 18a
And 18b are a refractory block and a supporting refractory block made of a ceramic material provided to cover the water pipe assembly 16 from the combustion gas 50.

The refractory block 18a and the supporting refractory block 18b are provided so as to cover the water pipe assembly 16 on one side from the combustion gas 50 side. Also,
The refractory block 18a and the supporting refractory block 18b
It is made of a heat-resistant material such as SiC, which has relatively high thermal conductivity and high heat resistance, and is formed by molding with a metal mold. Two water pipes surround the combustion gas 50 side of the water pipe assembly 16. It covers every 14th.

The flat ribs 15 of the water pipe assembly 16
In the longitudinal direction (axial direction) of the water pipe 14, it extends horizontally from the plate surface toward the supporting refractory block 18 b at a predetermined pitch, and then bends upward and parallel to the water pipe 14. The supporting arm portions 17b are alternately erected.

On the other hand, the refractory block 18a and the supporting refractory block 18b are provided with concave portions 18d and 18c which are fitted to the respective arm portions 17a and the supporting arm portions 17b.
It is formed corresponding to the arm part 17a and the support arm part 17b.

That is, as shown in FIG.
The recessed portion 18d on the side of the arm 8a is connected to the arm portion 1 fitted thereto.
The concave portion 18c on the side of the support refractory block 18b is provided in the horizontal direction corresponding to the shape of the support refractory block 18b. It is recessed so as to be bent. The mortar 13 is filled between each arm 17a and the recess 18d and between the support arm 17b and the recess 18c. As the mortar 13, the refractory blocks 18a, 1
SiC mortar which can improve the adhesive strength with 8b is preferable.

The arm portion 17a and the support arm portion 17b, and the concave portions 18d of the refractory block 18a and the support refractory block 18b provided corresponding to the arm portion 17a and the support arm portion 17b.
It is preferable that two rows of the water pipes 14 are provided as one set as shown in FIG. 2, but three or more rows may be provided as one set.

A mortar 13 is provided between the inner surfaces of the refractory block 18a and the supporting refractory block 18b and the outer peripheral surface of the water pipe 14 of the water pipe assembly 16 and the plate surface of the flat rib 15.
Is filled. The joint between the upper and lower ends and the left and right ends of the adjacent refractory block 18a and the supporting refractory block 18b is also filled with the mortar 13. Therefore, each of the refractory blocks 18a and the supporting refractory blocks 18b has its inner surface fixed to the water pipe assembly 16 by the mortar 13, and the upper and lower ends and the left and right ends are firmly fixed by the mortar 13 between each other. Become.

Reference numeral 11 denotes a castable refractory material mainly composed of SiC, Al ₂ O ₃ , or SiO ₂ provided above the refractory block 18a (or the supporting refractory block 18b) provided at the uppermost part. Numeral 12 is a cushion material for absorbing thermal expansion between the water pipe assembly 16 and the refractory block 18a or the supporting refractory block 18b. As the cushion material 12, a ceramic fiber mainly composed of Al ₂ O ₃ or SiO ₂ is preferable. However, as described above, the thermal expansion between the water pipe assembly 16 and the refractory block 18a or the supporting refractory block 18b is performed. Any material can be used as long as it can absorb heat and has heat resistance and high-temperature corrosion resistance. The arrangement of the cushion member 12 will be described later.

Front positions of the supporting refractory block 18b and the refractory block 18a (positions viewed from the combustion gas 50 side).
As shown in FIG. 1, the arrangement of 9 is made up of nine refractory blocks as a set of refractory blocks 30, and the central refractory block is constituted by the above-described supporting refractory block 18 b and surrounds it. Eight fireproof blocks are constituted by the fireproof blocks 18a as described above.

Then, as shown in FIG. 1, the joints between the ends of the refractory block group 30 including the nine refractory blocks are filled with the cushion material 12. Further, the joints between the ends of the refractory blocks constituting each refractory block group 30 are filled with mortar 13.

In this embodiment, one set of nine refractory blocks 30 is formed by surrounding one central refractory block 18b at the center with eight refractory blocks 18a. If the mortar 13 is filled into the joints between the ends of the plurality of refractory blocks and one or more of the mortars 13 are used as the supporting refractory blocks 18b, the number of the refractory blocks is Optional.

The refractory structure for protecting a water pipe having such a configuration supports one or at most about two of a refractory block group 30 composed of a plurality of refractory blocks.
b, positioning in the up-down direction and left-right direction is performed, and a plurality of refractory blocks 18a are bonded to the mortar 13 having a strong adhesive force at a high temperature to form an integrated refractory block group. Is the mortar 13
A refractory block group 30 firmly adhered is obtained, and the refractory block group 30 is supported on the water pipe assembly 16 by one or more supporting refractory blocks 18b, that is, a plurality of refractory blocks are provided. 18a
Can be simultaneously supported on the water pipe assembly 16 by the supporting refractory block 18b.

The supporting refractory block 18b constituting the refractory block group 30 and the refractory block 1 surrounding the same
The support arm 17b and the arm 17a for fixing the 8a to the water pipe assembly 16 are not exposed to the combustion gas 50 side, so that the support arm 17b and the arm 17a are corroded by the combustion gas 50. The refractory blocks 18a, 18b caused by such corrosion are prevented from falling off or being damaged.

Further, a plurality of refractory blocks 18a, 18
b with a mortar 13 to form one refractory block group 30
And one of them (or at most two)
Of the refractory block as the supporting refractory block 18b, is positioned and supported on the water pipe assembly 16 for each refractory block group 30, so that the refractory block is positioned on the water pipe assembly 16 and the support arm 17b for support is provided. The number can be significantly reduced compared to the prior art, which reduces the man-hours for installing the refractory block.

Further, since the joints between the ends of each of the refractory blocks 30 are filled with the cushion material 12, the thermal expansion between the refractory blocks 30 and the water pipe assembly 16 can be absorbed. Unlike the prior art, it is not necessary to fill the joints between the refractory blocks with the cushioning material 12, and the number of places where the cushioning material 12 is filled is reduced.
2, the number of construction steps is reduced.

Further, the provision of the castable refractory material 11 adjacent to the plurality of the refractory block groups 30 prevents the combustion gas from entering the support arm portion 17b and the arm portion 17a from outside the refractory block group 30. Can be prevented.

FIG. 4 is a diagram showing a second embodiment of the present invention.
It is an expanded sectional view corresponding to FIG. In this embodiment, the shape of the support arm portion 21 erected from the planar rib 15 of the water pipe assembly 16 toward the support refractory block 18b is changed so that the cross-sectional area is increased toward the support refractory block 18b. The concave portion 18e of the supporting refractory block 18b into which the supporting arm portion 21 is fitted is also configured to have a shape whose cross-sectional area is enlarged as it goes deeper according to the shape of the supporting arm portion 21, The mortar 13 is filled between them.

Accordingly, the refractory block group 30 is supported by the supporting refractory block 18b via the support arm portion 21 having the cross-sectional area changing as described above.
It will be supported by. Structures other than the above are the same as those of the first embodiment shown in FIGS. 1 to 3, and the same members are denoted by the same reference numerals.

[0040]

As described above, according to the present invention, a plurality of refractory blocks are filled with mortar in joints between them and fixed to form a unit refractory block group, and a cushion material is provided for each refractory block group. 1
With the support arm at about or two places, the difference in thermal expansion between the refractory block group and the water pipe assembly can be absorbed by the cushion material, and at one or at most two places A plurality of refractory blocks can be simultaneously fixed to the water pipe assembly only by the arm.

As a result, the number of support arms is reduced as compared with the prior art, so that the refractory block can be easily assembled and the number of assembly steps can be reduced. In addition, since the support arm for supporting the refractory block group on the water pipe assembly is not exposed to the combustion gas side, the occurrence of corrosion of the support arm and related members due to the combustion gas is avoided, whereby the refractory block is dropped or damaged. Can be prevented.

Further, since the cushioning material is filled for each refractory block group which is an aggregate of a plurality of refractory blocks, the cushioning material is individually filled in the refractory blocks as in the prior art. Therefore, unlike the prior art, it is not necessary to provide a cushioning material for each of the refractory blocks, and the number of filling portions of the cushioning material is reduced,
It is possible to reduce the number of man-hours for installing the cushion material.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a refractory structure for protecting a water pipe of a waste heat boiler according to a first embodiment of the present invention, as viewed from a refractory block side.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an enlarged view corresponding to FIG. 2, showing a second embodiment of the present invention.

FIG. 5 is a diagram corresponding to FIG. 1 showing a conventional technique.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

FIG. 7 is a sectional view taken along line CC of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Castable refractory material 12 Cushion material 13 Mortar 14 Water pipe 15 Flat rib 16 Water pipe assembly 17a Arm part 17b, 21 Support arm part 18a Fireproof block 18b Support fireproof block 18c, 18d, 18e Depression 50 Combustion gas

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Keita Inoue 12 Nishikicho, Naka-ku, Yokohama-shi Yokohama Heavy Industries, Ltd. (56) References JP-A-9-184602 (JP, A) JP-A-9-236203 (JP, A) Japanese Utility Model Showa 50-28174 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F22B 37/10 602

Claims (5)

(57) [Claims] Claims 1. A plurality of water pipes and water
Protects water pipe assembly consisting of flat ribs connecting pipes
Between the water pipe assembly and the combustion gasResistant toFire bro
In a fire-resistant structure for protecting water pipes,A support arm portion erected from the water pipe assembly; At least having a support portion engageable with the support arm portion
Multiple refractory blocks, including one supporting refractory block
The surrounding joints are filled with mortar, joined and integrated
With a group of refractory blocks formed in Through the supporting refractory block, a plurality of refractory blocks
The refractory block group formed integrally with the water pipe assembly side
In addition to supporting Cushions between adjacent joints between adjacent refractory blocks
That the filling material has been filled Characteristic fire protection structure for water pipe protection
body. 2. A plurality of water pipes and said water
Protects water pipe assembly consisting of flat ribs connecting pipes
Between the water pipe assembly and the combustion gasResistant toFire bro
In a fire-resistant structure for protecting water pipes,A support arm portion erected from the water pipe assembly; At least having a support portion engageable with the support arm portion
Multiple refractory blocks, including one supporting refractory block
The surrounding joints are filled with mortar, joined and integrated
With a group of refractory blocks formed in Through the supporting refractory block, a plurality of refractory blocks
The refractory block group formed integrally with the water pipe assembly side
In addition to supporting  Castable refractory material is installed adjacent to the refractory block group.
And fill the joint between them with the cushion material.
A fire-resistant structure for protecting water pipes. 3. A method for producing a plurality of water pipes and water
Protects water pipe assembly consisting of flat ribs connecting pipes
Between the water pipe assembly and the combustion gasResistant toFire bro
The water pipe assembly and the refractory block are mortared
How to assemble a fire-resistant structure for protecting water pipes fixed by
In the law,The water pipe assembly has a support erected on the refractory block side.
With arm part,  In the refractory block,The fitting part to the support arm part
At least one Supporting fireproof blockAnd several other
A refractory block, wherein the supporting refractory block and another refractory block fill the joints
Refractory blower integrally formed by mortar bonding
A block group integrating step, and the integrally formed refractory block group is
Via the support arm of the water pipe assembly
Assembling a refractory structure for protecting a water pipe, comprising the steps of:
Method. 4. A peripheral eye between said adjacent refractory blocks.
The method for assembling a water pipe protecting refractory structure according to claim 3 , further comprising a step of filling a cushion material between the grounds . 5. A cast stub adjacent to said group of refractory blocks.
A fireproof material, and put the cushioning material in the joint between them.
4. The method according to claim 3, further comprising the step of:
A method of assembling a water pipe protecting refractory structure.