JPS629180A - Furnace wall structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 1 on the top The present invention blocks the joint passing from the inside of the furnace to the furnace casing surface to prevent harmful substances and heat from exiting from inside the furnace to the furnace casing side through this joint. The present invention relates to a furnace wall structure constructed as described above.

LL to LL Previously, inorganic fiber blocks were attached to the surface of a furnace casing made of iron plates or angles using metal fittings to easily construct a furnace wall with good heat insulation efficiency. For example, inorganic mH block is made by laminating blanket-shaped ceramic fibers cut into strips to form blocks in the shape of cubes or rectangular parallelepipeds, or by adding an appropriate binder to bulk ceramic fibers. Examples include those molded into block shapes.

These inorganic things! A characteristic of the furnace wall formed by attaching fibrous blocks to the furnace casing surface is that when the contact surface or space formed by adjacent inorganic fibrous blocks is used as a joint, this joint can be easily seen from the inside of the furnace to the furnace casing surface. It lies in the fact that it is connected continuously.

On the other hand, with fired refractory blocks, the objective was to create a structure that would prevent individual blocks from moving due to various external forces.
In order to prevent the gas and heat inside the furnace from dissipating to the outside through these joints, a structure called a dowel is used, as shown in Figures 13 and 14.

FIG. 13 shows a structure in which adjacent fired refractory blocks are provided with recesses 2 and protrusions 1 that engage with each other and are bonded together with mortar 3. Figure 14 shows that semicircular recesses 5 are formed in adjacent fired refractory blocks, and the circular spaces created at the joints are filled with fired refractory pieces 4 of the same material that are smaller than the spaces and wrapped in mortar 3. It is a structure.

, the OV/pa that makes your mouth swell, but it's inorganic! ! It is difficult to apply such a conventional dowel structure to fiber blocks and is not very effective.

The reason for this is that even if you take the trouble to install the dowels, the characteristics of the fabric blower are that the parts that are heated to high temperatures in the furnace will gradually undergo thermal contraction, and the joints facing the inside of the furnace will shrink by the size of the shrinkage. There is a phenomenon of wedge-shaped frontage. In this phenomenon,
Once the opening is made, heat enters the opening and gradually reaches deep into the furnace wall, creating a gap in the dowel area. Furthermore, this phenomenon cannot be prevented even if the joint parts are bonded with an adhesive such as mortar.

Therefore, conventional dowel-like structures cannot guarantee permanent joint closure. Furthermore, there are recesses in the inorganic fiber block.
To form convex parts, it is common to cut the already completed inorganic fiber block with a saw.
This method is uneconomical as a lot of parts are discarded.
Inorganic fiber blocks are too flexible and cannot be processed accurately.

1) This invention solves the above-mentioned conventional problems, and in the furnace wall made of flexible inorganic fibrous blocks attached to the furnace casing surface, the inorganic fibrous blocks adjacent to each other are To provide a furnace wall structure having a structure that completely blocks joints to be formed, continues to permanently block them even if heat shrinkage occurs, and prevents gas and heat from dissipating from inside the furnace to outside the furnace. With the goal.

11 Hirobi Therefore, in order to achieve this object, the present invention provides a flexible inorganic fibrous block that is attached to a furnace casing surface, the surfaces of adjacent inorganic mH blocks facing each other being the first surface. and the second surface, and when the contact surface formed by the first surface and the second surface or the space sandwiched between the first surface and the second surface is used as the joint, the joint is perpendicular to the length direction. A prevention jig whose cross-sectional dimension in the width direction is larger than the thickness of the joint is inserted into both the first surface and the second surface of the mutually adjacent inorganic fiber blocks, and the inside of the furnace and the furnace casing. The main feature is that it is inserted in a direction almost parallel to the furnace casing surface so that it does not protrude from the surface.

1. In order to prevent 1. Referring to FIG. 1, the prevention jig 10 is inserted into the joint 13 of the inorganic fiber block 7 attached to the furnace casing surface 6. The prevention jig 10 is.

In a cross section perpendicular to the length direction, the dimension W in the width direction is larger than the thickness S of the joint, and as shown in FIG. Insert it so that it is almost parallel to the furnace casing surface 6 so that it does not protrude from the inside or outside the furnace casing surface 6.

LJL Multiple flexible inorganic tI attached to furnace casing 6
In the fibrous block 7, along the joint formed by mutually adjacent inorganic fibrous blocks 7, a cross section perpendicular to the length direction has a width W larger than the thickness S of the joint, and the upper and lower lines are parallel or at the center as necessary. When the hard prevention jig 10, which has a shape that expands vertically as it moves away from the furnace casing 6, is inserted almost parallel to the furnace casing 6, the prevention jig 1
0 bites into both adjacent inorganic fiber blocks 7, and the upper and lower surfaces of the prevention jig 10 and the inorganic fiber blocks 7 are in strong contact.

Maru 1i1 This will be explained with reference to FIGS. 1 and 2.

In the plurality of inorganic fibrous blocks 7 that are attached to the furnace casing surface 6 and constitute the furnace wall, the surfaces of the adjacent inorganic fibrous blocks 7 that face each other are defined by a first surface 8 and a second surface 8. Therefore, it is set as 9.

When the contact surface formed by the first surface 8 and the second surface 9 or the space sandwiched between the first surface 8 and the second surface 9 is used as the joint,
Prevention jig 10 whose dimension W in the width direction is larger than the thickness S of the joint
, the first surface 8 and the second surface of the adjacent inorganic fibrous blocks 7
Insert it so that it bites into both sides 9. At this time, the direction in which the prevention jig 10 is inserted is approximately parallel to the furnace casing surface 6.

In this invention, the furnace casing surface 6 forms part of the outer shell of the furnace, and supports the inorganic fiber block 7. The furnace casing surface 6 is, for example,
It includes not only flat structures such as iron plates and firebrick walls, but also structures made of iron angles, wire mesh, etc., which can support the inorganic fiber block 7 and have a planar shape.

The inorganic fiber block 7 is intended for various types. Items that are made of heat-resistant inorganic fibers, formed into blocks, and used as materials for furnace walls are eligible. However, flexibility to the extent that it can be easily cut with a paper knife, saw, etc. is necessary for the purpose of making it easier to insert the prevention jig 10. Therefore, rigid and hard materials such as fired refractory blocks are excluded.

Preferably, for example, (1) a blanket-like or felt-like ceramic fiber is cut into strips to form a strip-shaped sheet 11, and a large number of these are laminated to form the inorganic fiber block 7;

(2) Mix phenolic resin or latex with bulk ceramic fiber and mold it into one piece to create a moldless material II
A fiber block.

(3) Bulk ceramic fiber is formed into a box with a certain thickness, and the box is filled with bulk ceramic fiber.

etc.

Usually these inorganic fibrous blocks are attached to the furnace casing surface 6 in different directions.

Therefore, although there are various combinations of the first surface 8 and the second surface 9, the present invention can be applied to any combination of the first surface 8 and the second surface 9.

In general, inorganic fibrous blocks made by the method (1) above are considered to be the most resistant to high temperatures and are therefore preferred. When the present invention is applied to the first surface and second surface of such inorganic fibrous blocks 7, the first surface 8 and the second surface 9 constitute these inorganic fibrous blocks 7, respectively. It is preferable to apply it to a surface parallel to the lamination direction of the strip-shaped blanket 11 or felt.

Since the surface in the other direction is a conventionally compressed surface, it is difficult to see the joints, so it is less effective, and when the prevention jig 10 is inserted, the strip-shaped sheet 11 in that part will be cut and fall off. It is from.

The prevention jig 10 blocks the joints of the inorganic fiber blocks 7, and can withstand the temperature of the place where it is applied.
It has a heat resistance that allows it to be inserted into the inorganic fiber block 7, a density that allows it to block gas, and a shape that always maintains adhesion even when the inorganic fiber block 7 shrinks. It is necessary to have it.

First, regarding heat resistance, as the material for the prevention jig 10, for example, stainless steel or Inconel can be used as long as the operating temperature is 1100 degrees Celsius or lower.

If higher heat resistance is required, preventive jig 10
As the material, ceramics such as alumina, mullite, silicon carbide, silicon nitride, and zirconia are used. Furthermore, ceramics made by molding inorganic Na fibers such as ceramic fibers and mullite fibers together with various binders, and those whose mechanical strength is further strengthened with binders can also be used. Of course, ceramics
Although it can be used at temperatures below 1,100 degrees Celsius, the price should be taken into consideration when deciding.

This prevention jig 10 can take various shapes depending on the above-mentioned materials. Examples of cross-sectional shapes taken along a plane perpendicular to the direction of insertion into the MII fibrous block 7 include those shown in FIGS. 3 to 8, for example.

The prevention jig 10 shown in FIG. 3 is the prevention jig shown in FIGS. 1 and 2, and has a planar shape. This prevention jig 1
Both longitudinal edges 10b of 0 are sharp.

4 to 8 show other prevention jigs 20-60.

The prevention jig 20 shown in FIG. 4 has projections 20c formed vertically on both longitudinal edges of a middle plate 20b, and has a single-shaped cross section.

The prevention jig 30 shown in FIG. 5 has a cross-shaped cross section. 6th
The prevention jig 40 shown in the figure has a cross-shaped cross section, but a protrusion 40b extending in the left-right direction (width direction) inserted into the inorganic fiber block 7 is longer than a protrusion 40C extending in the vertical direction. Further, a protrusion 40d is provided along the longitudinal direction of the edge of the protrusion 40b.

Although the prevention jig 50 shown in FIG. 7 has a cross-shaped cross section,
A projection 5 in which a projection 50b extending in the left-right direction extends upward.
It is longer than 0c. In particular, the difference from the prevention jigs 10 to 40 shown in FIGS. 3 to 6 is that the top of the protrusion 50b, the underlines 50d, 50e are not parallel, but gradually widen up and down as they move away from the center position 12. It has a cross-sectional shape.

Similar to the one shown in FIG. 7, the prevention jig 60 shown in FIG. There is.

On the other hand, in the prevention jigs 10 to 40 shown in FIGS. 3 to 6, the top, underlined lines 10c, 10d,
20d, 20e, 30a.

Each set of 30b, 40e, and 4Qf is parallel to each other. In these examples, the width W must be greater than the thickness S of the joint to which it is applied. If it is smaller than the thickness S of the joint, it will not be possible to cut into both of the two inorganic fiber blocks 7 forming the joint at the same time, and the joint will not be blocked. Furthermore, if the width W is too large, it may cause increased resistance when inserted into the inorganic fibrous block 7, or the area cut when inserted into the inorganic fibrous block 7 becomes large, reducing the overall strength. It also becomes.

Normally, the width W is preferably 50 mm. In addition, in a cross section perpendicular to the length direction, the vertical lines of the parts extending left and right from each center position 12 are always parallel (see Figures 3 to 6), or are the parts extending left and right from the center position 12 It is necessary to have a shape that gradually expands upward and downward as it moves away (see Figures 7 and 8).

However, the shapes of both ends and the center portion 12 are not particularly limited. For example, even if the center portion 12 has a projection perpendicular to the width direction, if the width of the projection is narrow, the joint will not be pushed open and the effect will remain the same.

The length L of each piece may be long or short, but if it is too long, handling may be inconvenient, and depending on the angle at which it is inserted, there is a risk that the length L may protrude into the furnace or onto the furnace casing surface. Also, if it is too short, it will take time and inconvenience to install.

Usually, the length L is preferably the same as the length of one side of the inorganic fiber block 7.

The attachment method is to insert it directly into the soft am-free fibrous block 7, or to make a narrow cut in the am-free fibrous block 7 with a sharp knife in advance and insert it along this cut.

At this time, it is also possible to coat the prevention jig 10 with adhesive and insert it. Each prevention jig 10, 20, 30, 40, 50.6 is usually installed by inserting it into this hole.
0 one end 10a, 20a, 30a, 40a, 5
0a.

It is convenient for 60a to be pointed because it has less resistance.

Next, as an example, a situation in which the prevention jig 10 is inserted into a joint 13 formed by two inorganic fiber blocks 7 will be explained with reference to FIGS. 1 and 2.

In the figure, a plurality of solid fibrous blocks 7 are attached to the furnace casing 6 by suitable attachment means. Muta next door! A joint 13 is formed by the lithium block 7. A flat prevention jig 10 having a width W larger than the thickness S of the joint 13 is inserted so as to divide the joint 2 into upper and lower parts and to bite into both of the two inorganic fiber blocks 7. There is.

Here, the prevention jig 10 is inserted substantially parallel to the furnace casing surface 6, but "substantially parallel" means that it has a considerable degree of freedom in terms of angle.

Specifically, one end 10a of the prevention jig 10 is connected to the furnace casing 6.
This means the angle at which it will not fly out into the furnace. This angle changes depending on the length of the prevention jig 10 and the thickness of the furnace wall.

Next, Examples 2 to 4 of furnace wall structures constructed using the prevention fitting 10 shown in FIG. 3 will be described.

Figures 9 to 11 show Examples 2 to 4;
The figure is a cross-sectional view of a conventional furnace wall structure and is a reference example.

9 to 11, inorganic fiber blocks 7 forming joints 13, 23 of various shapes are attached to the furnace casing surface 6 made of iron angles. These inorganic fiber blocks 7 are all made by laminating blankets. Here, the first surface 8. which forms a joint 13.23 with its neighbors. The second surfaces 9 are each a surface formed by a cut of the blanket. To give a specific example of dimensions, the spacing between the joints is about 300 mm. The dimensions of the joints in the thickness direction of the furnace wall are all 300 m1.

In each of Figures 9 to 11, the thickness is 31 = 311.
Joint 13 of 1111 and joint 82-0111111'
There are two types of 23.

Next, a prevention jig 10 made of ceramics with a dense structure containing, for example, alumina is inserted 100 mm from the inside of the furnace.
parallel to the furnace casing surface 6 along the joint 13.23 at a depth of 1 ml, and inorganic fiber blocks 7 on both sides.
It is inserted so that it bites into the hole almost evenly. When inserting, insert the prevention jig 10 with its pointed end 10a first. At this time, the dimensions of the prevention jig 10 are: length = 300 m
The dimensions of the cross section perpendicular to the length direction at m are width -5Qmm and thickness 5mm, and the upper and lower lines are parallel.

Sequentially, a prevention jig 10 is attached to such an inorganic fiber block 7.
is inserted into the furnace casing to create a furnace wall structure of 900 mm in length and width in each case as shown in FIGS. 9 to 11.

In addition, in FIG. 12, as a comparative example, a cylindrical space with a diameter of 30 mm+ can be seen at the joint part 13.23 of the inorganic fiber block 70, and in this space, a diameter of 2 Q mm,
Inorganic material with a length of 300ml! Mortar 3 is attached around the L-striped lower shaped product 4 and inserted. In this way the 12th
Make the furnace wall structure shown in the figure.

Next, the furnace wall structures of FIGS. 9 to 11 showing the furnace wall structures of the present invention and FIG. 12 showing a comparative example were each installed as part of the furnace wall of a separately prepared test furnace. We will conduct a heating experiment and report the IC results.

The inner surface of each furnace was heated at 1300 degrees Celsius for 100 hours, and at the same time ammonia gas was introduced into the furnace for testing.

As a result, in the furnace wall structures of the present invention shown in FIGS. 9 to 11, almost no hot ammonia flow was observed to flow out from the joints on the furnace casing side during heating.

This condition did not change over time.

However, in the furnace wall structure shown in FIG. 12, which is a comparative example, a hot ammonia-smelling gas flow was observed to flow out from the joint on the furnace casing side 12 hours after the start of heating. This gas flow became more popular over time.

Note that the present invention is not limited to the above embodiments.

When a heat-resistant prevention jig is inserted almost parallel to the furnace casing surface along the joint formed by adjacent flexible inorganic fiber blocks, the width W in the cross section of the prevention jig is larger than the thickness S of the joint. can be completely blocked.

As a result, gas dissipating from the inside of the furnace to the furnace casing surface through the joint can be completely blocked, and heat dissipation can also be reduced.

Furthermore, in the cross section perpendicular to the length direction of the prevention jig, the upper and lower lines are parallel to each other (because they have a shape that expands in the vertical direction as you move away from the center of the cross section to the left and right,
Even if the lower lock of the MIL II screen shrinks due to heat and moves to open the joint, the gap will be created just by moving the upper and lower surfaces of the inorganic TlIII blotter blocks that are in contact with these blocks. do not have.

Therefore, the effect of preventing gas and heat from dissipating from the inside of the furnace to the surface of the furnace casing through the joint continues forever.

[Brief explanation of drawings]

Figure 1 is a side view showing Example 1 of the furnace wall structure of the present invention, Figure 2 is a front view of Example 1, and Figures 3 to 8 are of a prevention jig used in the present invention. A perspective view with a cross section showing each embodiment, FIGS. 9 to 11 are front views showing embodiments 2 to 4 of the furnace wall l1lt structure of the present invention, and FIG. 12 is a comparison with embodiments 2 to 4. 13 and 14 are perspective views showing typical conventional furnace wall structures. 6. Furnace casing surface 7 Inorganic fibrous block 8.9. ,,
,,,first and second surfaces 10.20°30.40°50.60. , , , Prevention jig 13.23. ,,,,Joint Figure 1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 11 Figure 12 Figure 51 b? Figure 13

Claims (8)

[Claims] (1) A flexible inorganic fibrous block that is attached to the furnace casing surface, in which the surfaces of adjacent inorganic fibrous blocks that face each other are defined as a first surface and a second surface, and the first surface and the second surface are When the contact surface formed by the second surface or the space sandwiched between the first surface and the second surface is used as a joint, the dimension in the width direction is larger than the thickness of the joint in a cross section perpendicular to the length direction. Place the prevention jig against the furnace casing surface so that it bites into both the first and second surfaces of the mutually adjacent inorganic fiber blocks, and so that it does not protrude into the furnace or onto the furnace casing surface. A furnace wall structure that is inserted in a substantially parallel direction. (2) The furnace wall structure according to claim 1, wherein the prevention jig has upper and lower lines parallel to each other in the width direction in a cross section perpendicular to the length direction. (3) The furnace wall structure according to claim 1, wherein, in a cross section perpendicular to the length direction, the upper and lower lines in the width direction of the prevention jig widen upward and downward as they move away from the center of the cross section. (4) The first and second surfaces into which the prevention jig bites are the surfaces of an inorganic fibrous block made by stacking together a large number of strip-shaped sheets cut out from inorganic fibrous sheets. The furnace wall structure according to claim 1, wherein the surface is parallel to the stacking direction. (5) The furnace wall structure according to claim 1, 2, or 3, wherein the prevention jig is made of heat-resistant metal or ceramics. (6) Claims 1 or 2 or 3 or 4 or 5, wherein the cross section of the prevention jig cut in the width direction is linear-shaped, and one end is pointed. Furnace wall structure described in section. (7) According to claim 1 or 2 or 4 or 5, the cross section of the prevention jig cut in the width direction is I-shaped and one end is pointed. Furnace wall structure. (8) Claim 1 or 2 or 3 or 4 or 5, wherein the cross section of the prevention jig cut in the width direction is cross-shaped and one end is pointed. The furnace wall structure described.