KR820000039B1 - New fur-nace walls which can be used at high temperatures - Google Patents

Abstract

This invention relates to a furnace which has tubes to distribute heating gas within. This furnace walls which can be used at high temp. are made of refractory steel, refractory concrete and Silica-Alumina containing silicic refractories and a little Alumina. In figure 1, refractory bricks(1) made of Silica-Alumina have relative mechanical strength and their surfaces are covered with insulated layers(2).

Description

New furnace wall for high temperature

1 is a cross-sectional view of a partition wall between two furnaces A and B. FIG.

2 to 8 are detailed cross-sectional views along the line II-II showing various arrangements of the fluid introduction conduits in the sheet of the furnace wall.

The present invention relates to a treatment furnace operated at a temperature of 900 ° C. or higher and having such a high temperature fireproof wall surface and a conduit for distributing the fluid required for heating into the furnace.

The furnace walls of an industrial furnace, which must carry out the reaction at a high temperature, are made of the following material.

Refractory Steel When Maintaining Oven Temperature Below 900 ℃

Refractory ceramic materials and refractory concrete, such as silicate-alumina bricks containing siliceous refractory bricks or some alumina.

Electric melting material when it is necessary to obtain the temperature of 1500 ℃ or higher.

Both refractory ceramic materials and electrolytic materials are somewhat sensitive to thermal shock. That is, it causes a sudden temperature fluctuation for an arbitrary amplitude. On the other hand, all of these materials contain, to some extent, glassy material that, under certain temperatures and given processing conditions, attempts to bind similar materials that may be present in the product to be treated to the furnace wall material. This means that the chemical reactions occurring inside the furnace must be carefully carried out in order not to crack the refractory or the electrolytic material and to prevent the furnace wall from being applied by the molten product. Moreover, repair of such refractory materials is difficult and always costly. It is also known that refractory alloys are somewhat beneficial at working temperatures up to at least about 900 ° C. Above these temperatures, even if the surface conditions of these alloys are adequately maintained at about 1200 ° C, the mechanical strength of these alloys is dependent upon the conditions used. As they decrease somewhat rapidly, they cannot bear substantial stress.

Moreover, the molten phase of the product to be treated itself adheres to the surface of these alloys, but such attachment does not result in sufficient association with the alloy.

In addition, for many furnaces operated at high temperatures, it is necessary to introduce and distribute the fluids required to heat these furnaces, such as fuels, other combustible materials, combustible products or mixtures of these various fluids. The introduction of these various fluids introduces a number of problems associated with the inhomogeneity of the specification of the conduit, which introduces the fluid and is subjected to high temperatures.

In order to minimize these difficulties, a method of arranging these conduits has already been proposed for the requirements formed on the walls of the furnace, which has the major advantage of freeing the total volume of the furnace, but conduits facing the inner side of the furnace. There is a drawback that increases the difficulty associated with the temperature difference between a portion of and a portion of the conduit facing the furnace wall.

The present invention relates to a mineral refractory material for forming a furnace wall load-bearing portion selected from a ceramic material and an electric molten material, a refractory alloy protector for covering and protecting a furnace wall surface made of a refractory material, and joined to the refractory metal protector. A wall surface is formed by using a support body forming a molded part of the fire resistant material, and a plurality of plates mounted on the support body, and the fluid is introduced and distributed between the mounted plates. The device forms a demand to pass through, and the device is composed of an outer conduit and an inner conduit such that the stress generated in the outer conduit is not transmitted to the inner conduit. It is a primary objective to provide new furnace walls for high temperature with the required requirements for passage of the fluid introduction conduits to be dispensed.

The furnace wall according to the present invention can also be characterized in that a insecticide of silica-alumina material containing a surface of a heat resistant insulating material, preferably a mineral refractory material, is provided between the mineral refractory material and the metal alloy protector.

The new furnace wall according to the present invention can be used to make all or part of the furnace, for example to form the outer wall of the furnace or a partition wall between two furnaces.

The placed material sheet forming the interior of the furnace can be easily replaced by a plate configured in advance in the same manner. Since the protection material of the refractory material which covers the surface of the refractory material which forms the mechanical resistance part of a furnace wall protects this furnace wall from thermal shock, it turns out that the downtime for repairing the furnace manufactured by this invention is as short as possible.

Moreover, these mounted plates can be sized to protect as much of the majority of the surface of the furnace as possible in the normal area, given the various equipment fitted to the furnace. Features They pass through the high heat section of the furnace and can be used to at least partially protect conduits that may prematurely corrode or wear due to the presence of solid particles moving in the furnace.

While these conduits are actually located on demands made on the furnace walls, it has been found that even with such an arrangement the conduits are substantially deformed. In order to avoid this deformation, it has been found that the conduits should consist of a large conduit of the furnace where the gas is introduced and an outer conduit surrounding the large conduit to protect the large conduit.

Thus, according to the device, the fluid introduced through the conduit passes through the outer conduit before being dispensed into the furnace, so that the device provides a fluid introduction conduit (most conduit) and other means for properly dispensing the fluid to the furnace. It is possible to use conduits (external conduits).

The outer conduits are arranged such that the stresses and strains that can be applied thereon cannot have a significant effect on the majority conduits, and for this purpose use of various known solutions for connecting these two conduits, for example thin deformation members. Extension bellows made of threaded or telescopic joints can be used.

As a result, it has been found that the outer conduits can be shaped and occupy such a position that they can form vertical surfaces and continuous walls together with the material plates on which they are placed. Thus, for example, these conduits may have a rectangular cross section with an outer surface located coplanar with the free surface of the mounting material plate. Such a configuration is in such a form as to avoid local vortices in the furnace and prevent binding of the molten product to the conduit surface that may be present in the furnace.

The present invention will be described in detail with reference to FIG. 1 and FIG.

In FIG. 1, 1 is a big material which has the mechanical resistance of a silica sand-alumina brick material, for example. 2 is a dialogue insulation layer covering the two surfaces of the dialogue material, and for this purpose, a felt or a board composed of kaolin base fibers is preferably selected. 3 is also a large alloy protector covering the large insulating material 2. In this figure, the two materials 2 and 3 are supported in place on the surface of the central dialog by a screw rod 4 equipped with washers and nuts at both ends thereof. The screw rod is made of, for example, a refractory alloy. 5 is a mounting member made of a refractory alloy, which is welded at an appropriate position on the lower protective member. Fig. 6 is a cover member made of refractory alloy, which is simply bent on the mounting member 5.

In this figure, conduit 7 is located in a request formed by the inner wall of the furnace and can be used for air introduction or various fluid circulations. As can be seen from the figure, the covering member placed on the base partially protects the conduit.

In FIG. 2, 8 is the end wall of the furnace, 9 is the bottom of the request formed in the wall of the furnace, and the device 7 for fluid introduction and distribution is embraced in this request.

Device 7 is formed from an inner conduit with an outer conduit 10 secured around the conduit. Conduits 10 and 7 are joined by telescopic bellows 11.

The fluid passes through conduit 7, which is discharged through the orifice of the conduit, introduced into conduit 10, and from there into the interior 12 of the furnace.

Two conduits of different structures may be used. In addition, the inner and outer conduits may be joined by a deformable thin metal member located at both ends of the outer conduit, which is briefly indicated as 13 in FIG.

It is also possible to form a flexible joint between the two conduits according to the assembly method briefly shown in FIG. 4, although a suitable gasket (e.g. asbestos) is of course secured to the junction between the conduits. It is also possible to use several short conduits which are installed on the same inner conduit as interconnectable or unconnectable, which is shown briefly in FIG.

It is also possible to use two inner conduits arranged adjacent to the closed ends, as shown in FIG. With respect to this drawing, the following interesting fact is that if the orifice in the inner conduit, which passes the fluid from the inner conduit to the outer conduit, is located near the center of the furnace (in this case, near the closed end of the inner conduit), It is appreciated that the maximum amount of fluid will in fact flow through the inner conduit. Proper distribution of the fluid in the furnace is achieved by an orifice with the appropriate position and size within the sole outer conduit.

If the fluid introduction into the furnace and the distribution of this fluid in the furnace are separated, the uniformity of the temperature of the internal conduits can be better achieved, and furthermore, the conduits can be made of various protectors, i.e. Relatively low and uniform temperatures can be maintained by various protectors that can be placed outside or inside the conduit, such as an insulation protector.

In order to make the internal conduit more robust, it is also possible to install this conduit (e.g. by spring) under slight tension and be compatible with the strength of the conduit at the operating temperature conditions as well as the applied tension. The use of this tensile force is particularly advantageous when the length of the furnace wall is extremely long, for example 3 m or more.

According to a specific embodiment of the present invention, the outer conduit can bear certain deformations, but these deformations are relatively limited since they are mainly generated in the deformation joints located at both ends of the conduit, and the reason for this is that the outer conduit is, for example, ceramic It was found that even a solid material such as a material could be applied internally with such a fireproof material.

In a simple variant of the device, the inner conduit is used for fluid introduction and for fluid distribution in the furnace.

This conduit preferably insulates the outer surface from heat by a flexible refractory material.

The outer conduit may be replaced with fragments of short length surrounding the fluid introduction tube and hereinafter called discs, but the shape does not necessarily have to be cylindrical. These discs are preferably separated from each other by a thin gasket composed of a refractory material having some degree of reflection.

Of course, the disc located in line with the orifice for injection into the furnace is perforated on the portion coinciding with the orifice.

The assembly is fixed on the gas introduction tube and supported by stops located in the direction of each end of the conduit.

In this simplified variant of the device, the fragments surrounding the fluid introduction tube are perforated to leave free space around the fluid introduction tube.

Transverse lateral movement of these discs in the fluid introduction tube is prevented by suitable means such as protrusions and the like.

The device according to the invention consisting of a disc which is an inner conduit and an outer conduit for fluid introduction is shown in FIG.

In this figure, it can be seen that the inner conduit 13 is closed at one end of the inner conduit 13 and attached to the insulator 14. Around this conduit a disc 15 is located between two stops 16 and 10. The gasket 18 is located between these discs.

In a variant of this latter device, the inner conduit is also used for fluid introduction and for dispensing of the fluid into the furnace (Fig. 8).

The conduit 19 is thermally insulated from the outside by, for example, the flexible refractory material 20.

Fluid is distributed through the nozzle 21 through the insulator.

The insulator and the inner conduit are cylindrical or non-cylindrical and are protected by short-length pieces 22 fixed to or held in place with the nozzle 21.

These protective pieces can be separated into gaskets to have sufficient clearance between them or to be deformed without significantly affecting the inner conduit or its refractory protector.

The novel furnace wall according to the present invention can be used in various types of furnaces, but it has been found to be particularly useful for producing furnaces for carrying out coking or oxidation reactions of masses based on coal or carbonaceous materials.

Claims (1)

A new high-temperature furnace wall having a permissible working temperature of 900 ° C. or higher and having a requirement that a conduit for introducing fluid to be distributed into the furnace can be passed, wherein the load-bearing portion of the furnace wall selected from ceramic materials and electric melting materials is used. With the mineral fireproof material 1, the refractory alloy protector 3 which covers and protects the furnace wall surface made of fireproof material, the support body 5 which joins to the above-mentioned furnace wall protector of fireproof material, or comprises the molded part of the fireproof material, And a plurality of plates 6 mounted on the support, and between the mounted plates, an outer conduit 10 and an inner conduit 7 so that the stress generated in the outer conduit is not transferred to the inner conduit. High temperature new furnace wall, characterized in that the device has a request to pass.

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