JPS5940886B2 - Method for forming fireproof insulation material coating on water-cooled pipes for continuous heating furnaces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a refractory insulation coating on a water-cooled pipe for a continuous heating furnace. The outer circumferential surface of the main skid water cooling pipe, cross pipe, and support pipe (hereinafter collectively referred to as [continuous heating furnace water cooling pipe J]) installed in the heating furnace is made of non-refractory material such as fireproof castable or fireproof plastic. Y-shaped or Y-shaped anchor studs (hereinafter collectively referred to simply as "anchor studs") were provided to support lining shaped refractories or to prevent them from falling off, but these existing anchor studs In addition to this, new longer anchor stands were installed, and while supported by these anchor stands, we first formed a fireproof and heat-insulating layer of stamp material whose main component was ceramic fiber, and then coated the outer surface of this layer. The present invention provides a quick, easy, and economical method for forming a coating of a refractory heat insulating material on a water-cooled pipe for a continuous heating furnace, which is used to coat a monolithic refractory.

As mentioned above, even if there are existing anchor studs on the outer circumferential surface of the water cooling pipe for continuous heating furnaces, the purpose is to do this without removing them all or correcting their arrangement. After creating new anchor studs that are longer than the existing anchor studs and adjusting the lengths of the old and new anchor studs, we first use a stamping material that is mainly composed of ceramic fibers, that is, has high fire resistance and excellent heat insulation properties. 1. By forming a fireproof heat insulating layer using a mixture of adhesive, irregularly shaped ceramic fibers, water, adhesive, etc.
Even if there is an existing anchor stand, the workability will not be reduced in any way; rather, by coating the outer surface of the anchor stand with a strong and inexpensive monolithic refractory, the interior can be made with excellent heat insulation. A method for forming a fireproof insulation coating on a water-cooled pipe for a continuous heating furnace, which forms a double structure consisting of a highly elastic layer and a strong layer on the outside, and is easy and quick to construct, has good workability, and is economical. The aim is to make it possible.

Conventionally, the method for forming a coating with this type of fire-resistant insulation material is to provide supporting anchor studs on the outer circumferential surface of a water-cooled pipe for a continuous heating furnace, and to attach a monolithic refractory material such as refractory castable or fire-resistant plastic to the outer circumferential surface. A method of pouring or hammering was used.

However, this method of coating the outer circumferential surface of a water-cooled pipe for a continuous heating furnace with a refractory heat-insulating layer made only of monolithic refractories is disadvantageous in terms of energy conservation because the loss of heat dissipated from the surface is large. However, since the entire structure is uniformly strong, it has poor spalling resistance, is prone to cracking and peeling, and has poor durability.

Therefore, in order to solve these shortcomings,
A skid water cooling pipe has been proposed in which an elastic heat insulating layer is provided by wrapping a cotton-like blanket or band-like bulk of ceramic fiber inside the coating layer of the monolithic refractory as seen in Japanese Patent No. 13681. It has been adopted.

However, when attempting to implement such a skid water-cooled pipe, if there are existing anchor studs on the outer circumference of the pipe, these existing anchor studs may become an obstacle to attaching the ceramic fiber blanket or bulk. As a result, the workability is reduced, and it may be impossible to adhere to complex-shaped pipes where the cross pipe intersects with other pipes, or the ceramic fiber elastic insulation layer on the inner layer may deteriorate. This has the disadvantage that it absorbs moisture from the indefinite refractories on the surface, inhibiting the hydration hardening reaction of refractory castables and causing strength deterioration.

In view of these circumstances, the present inventors developed an irregularly shaped stamp material containing ceramic fiber as a main component in place of the ceramic fiber elastic heat insulating layer of the invention disclosed in the above-mentioned Japanese Utility Model Publication No. 43-13681. By adopting this method, the efficiency of the coating formation work is significantly increased, all of the above-mentioned drawbacks are solved, and the advantages are taken advantage of. No. 51-30626).

The present invention is an attempt to further improve the invention related to the above-mentioned optical patent application.

In other words, conventionally, when constructing a new water cooling pipe for a continuous heating furnace or replacing it, it was necessary to arrange the anchor studs in a rational manner and somehow secure the pipes even if they were made of ceramic fiber blanket or bulk. However, when performing covering work such as replacing only the fireproof insulation layer on the outer circumferential surface of the pipe or partially repairing it, it is necessary to melt and remove all the existing anchor studs.
It was necessary to install a new anchor stand by welding, etc., and cover it with fireproof insulation material.

Therefore, when the anchor studs are fused and removed, the pipes may be damaged, and replacing all the anchor studs requires a great deal of cost and time.

Therefore, the present inventors conducted various studies to apply the technical concept of the previously proposed invention when replacing only or partially repairing the fireproof insulation layer on the outer circumferential surface of the pipe, and found that, for example, continuous heating Approximately half or less of the existing anchor studs on the outer circumferential surface of the water cooling pipe for the furnace will be removed by fusing, and a new anchor stud that will be as long as the thickness will be coated with a fireproof insulation layer made of stamp material whose main component is ceramic fiber. By setting the long and short lengths of the old and new anchor studs as a whole, it is possible to construct the internal ceramic fiber fireproof insulation layer more easily and quickly than with the conventional method, and it is also possible to install the external monolithic refractory. It has been discovered that this new effect can be achieved by preventing the fire-resistant lining layer from peeling off.

In this way, the reason why the new and old anchor studs have different lengths is that they are relatively short, like the existing old anchor stands, to support the stamp material whose main component is ceramic fiber that forms the inner layer. On the other hand,
The newly provided long anchor studs can firmly support the monolithic refractories that form the outer layer, and in addition, in conventional methods, the surface of the water-cooled pipe is lined only with monolithic refractories such as fire-resistant castable or fire-resistant plastic. The length of the anchor stud is approximately 50 mm.
~60Cr11 was sufficient, but it would be better to use a double structure skid pipe as proposed in the above-mentioned Japanese Utility Model Publication No. 43-13681 or a double structure as in the present invention to further improve its fire resistance and heat insulation properties. In this case, it is important to slightly increase the thickness of the entire fireproof insulation layer, and if long and short anchor stands are arranged alternately, for example, it will be especially important to make the fireproof insulation layer below it thicker. This is because there are advantages such as easier and faster work.

To this end, it is necessary to improve the durability (lifespan) of water cooling pipes that were previously lined only with monolithic refractories, and furthermore, when re-lining them for purposes such as energy conservation, monolithic refractories should be used. By removing less than half of the existing anchor studs while removing the lining and installing new relatively long anchor studs, or by cutting the existing anchor stand and joining a new anchor stud to it, it is possible to It is much more advantageous both economically and in terms of shortening the construction period, since there is no need to damage or replace all the parts.

The outer periphery of the water-cooled pipe on which the anchor studs are installed is first coated with a fireproof and heat-insulating layer made of a stamp material whose main component is ceramic fiber. , pre-water and starch paste, CMC (carboxyl methyl cellulose),
Because it is a kneaded mixture of ceramic fibers with adhesives such as sodium alginate, inorganic binders such as silica gel and alumina sol, as well as surfactants and foaming agents, if necessary, it becomes sticky and It is an irregularly shaped object that can be freely deformed because it is rich in plasticity, and even if there is an existing anchor stud, the workability will not be reduced in any way, and the water cooling pipe has a shape similar to that of the previous one. It can also be coated quickly and easily.

In other words, regardless of the size of the diameter of the water cooling pipe, and even if the shape is abnormal such as a daruma shape or an egg shape, or a complex shape such as the intersection of a cross pipe and a main skid water cooling pipe, The work can be done freely, easily and quickly according to the shape and size, and the work can be done in less than half the time compared to conventional construction, and as mentioned above, it can be done quickly.

Since tamping material is a wet kneaded material containing an appropriate amount of water, even if the outer surface is coated with a monolithic refractory (e.g. refractory castable), it will not absorb the water essential for these water hardening reactions. Rather, the reaction is promoted under good conditions to form a strong fireproof heat insulating layer,
Its strength can be improved.

Furthermore, not only can the thickness of the fireproof heat insulating layer formed in this way be freely selected, but also
The organic matter contained in the stamp material is gradually burned away by heating during use, giving the lower layer appropriate elasticity, and
It is possible to significantly improve the spalling resistance of the water-cooled pipe by acting as a buffering material for the fireproof insulation layer made of the monolithic refractory material in the upper layer, and sufficiently withstanding rapid thermal changes of the water-cooled pipe.
Furthermore, it brings about a number of excellent effects, such as being able to reduce the amount of heat dissipated by the water-cooled pipe to about % or less compared to conventional pipes.

As described above, according to the present invention, there is no need to replace all the existing anchor studs, and there is no need to correct their arrangement, but simply by providing lengths and shorts in the anchor studs, the retention of the double fireproof insulation layer is increased. The construction is simple and quick, and it is possible to provide a water-cooled pipe for a continuous heating furnace that is extremely economical and has excellent fireproof insulation properties and spalling resistance.

Hereinafter, specific examples of the water-cooled pipe for continuous heating furnace obtained by the present invention will be explained with reference to the drawings.

First, Figure 1 is a vertical cross-sectional view of a water-cooled pipe for a continuous heating furnace equipped with anchor studs for supporting or preventing falling off for lining only monolithic refractories such as refractory castables or refractory plastics according to the conventional method. FIG. 2 shows a corresponding cross-sectional view.

In these drawings, reference numeral 1 denotes the water cooling pipe, and for example, an iron pipe with a finch diameter is used.

Reference numeral 2 denotes an anchor stud, which is attached to the outer peripheral surface of the water-cooled pipe by welding or tightening a nut prior to lining construction in order to support the monolithic refractory or prevent it from falling off.

FIG. 3 is a longitudinal sectional view of the water-cooled pipe shown in FIGS. 1 and 2, with the outer peripheral surface lined with fire-resistant castable or fire-resistant plastic, and FIG. FIG.

In the above drawings, numerals 1 and 2 respectively indicate the water cooling pipe and the anchor stand provided on its outer peripheral surface as described above, and numeral 3 indicates a fireproof heat insulating layer of monolithic refractory material, such as alumina. Fireproof castable (SK36 or higher) is used.

Next, the water-cooled pipe obtained by the present invention will be explained.

Fig. 5 is a vertical cross-sectional view of the water-cooled pipe in which long and short lengths are alternately provided using existing anchor studs provided on the outer peripheral surface of the water-cooled pipe, and Fig. 6 corresponds to this. FIG.

In the above drawings, 2a shows the existing anchor studs as they are, and 2b shows a new, longer anchor stand by removing these existing anchor studs.

FIG. 1 shows that the outer circumferential surface of the water cooling pipe shown in FIGS. Bulk of ``F]'') 6
Parts by weight (bulk specific gravity approximately 0.1), 13 parts by weight of water, and parts by weight of MC (methyl cellulose) are kneaded in a Z-type kneader to form a coating, and then the outer surface is coated with a wet stamp material. - While supporting the relatively long anchor studs described in 2b, the monolithic refractories (for example, alumina refractory castables of 5K36 or higher) are held until sufficient moisture remains on the surface or inner layer of the coating layer of the stamp material. FIG. 8 is a longitudinal cross-sectional view of the pipe, which has been coated with a double layer of superior refractory cross-section during heating, and FIG. 8 is a corresponding cross-sectional view.

In the drawings shown in Figure 2, numeral 3 indicates a lower refractory cross-sectional layer made of a stamp material whose main component is ceramic fiber, and numeral 4 indicates an upper refractory heat insulating layer made of a monolithic refractory.

In the thus obtained double-structured fireproof and heat-insulating coating layer, the ceramic fibers and the monolithic refractories mix well even at the interface, and the ceramic fibers play the role of a cutter. There is no clear boundary line as shown in the above drawings, which is an advantageous condition in terms of strength and workability, and how will the advantage be demonstrated?

[Brief explanation of the drawing]

FIG. 1 shows a longitudinal cross-sectional view of a water-cooled pipe for a continuous heating furnace provided with an anchor stand in the conventional method, and FIG. 2 shows a corresponding cross-sectional view. FIG. 3 is a longitudinal sectional view of the water-cooled pipe shown in FIGS. 1 and 2 above, with only monolithic refractories lining the outer peripheral surface of the pipe, and FIG. 4 corresponds to this. FIG. FIG. 5 shows a longitudinal cross-sectional view of a water-cooled pipe for a continuous heating furnace in which existing anchor studs and longer new anchor studs are alternately provided in the method of the present invention, and FIG. 2 shows a cross-sectional view corresponding to FIG. FIG. 7 shows a longitudinal cross-section of the water-cooled pipe shown in FIGS. 5 and 6, whose outer peripheral surface is coated with a stamp material mainly composed of ceramic fibers and a monolithic refractory, respectively. FIG. 8 is a cross-sectional view corresponding to this. In the above drawings, 1 is a part of a water cooling pipe for a continuous heating furnace, 2 is an anchor stud, 2a is an anchor stud similar to 2 above, 2b is a newly installed anchor stud, and 3 is a stamp material whose main component is ceramic fiber. 4 indicates a fireproof heat insulating layer made of a monolithic refractory.

Claims (1)

[Claims] 1 New anchor studs that are longer than the existing anchor studs are installed on the outer periphery of a water cooling pipe for a continuous heating furnace where an anchor stand has already been installed, and while supported by these anchor studs, 1. A method for forming a fire-resistant heat-insulating material coating on a water-cooled pipe for a continuous heating furnace, the method comprising: forming a fire-resistant heat-insulating layer on a stamp material, and then coating the outer surface of the fire-resistant heat-insulating layer on the stamp material with an amorphous refractory.