JP2008224145A - Construction method of hearth using heat insulating fire brick - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of a hearth using heat insulating fire bricks short in construction period without needing a furnace building worker with expertise and moreover dispensing with pre-drying. <P>SOLUTION: The construction method of the hearth using the heat insulating fire bricks for constructing the hearth by covering the bottom of an industrial furnace with the heat insulating fire bricks 11 comprises a step for combining a plurality of the heat insulating fire bricks 11 into predetermined shapes while bringing them in direct contact with one another and binding them by heat resistant ceramic ropes 12 to form a furnace brick block 13, and inserting heat resistant ceramic fiber buffer materials 18, 19 between the hearth brick blocks to arrange and lay the hearth brick blocks 13 all over the bottom. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a method for constructing a hearth of an industrial furnace such as a heating furnace or a heat treatment furnace using a refractory heat-insulating brick, and more specifically, an operator is placed and moved during the construction of a furnace (new construction, renovation, or repair). The present invention relates to a construction method using a fire-resistant and heat-insulating brick for a hearth in which an electric heater is installed.

In recent years, when building ceilings and side walls of industrial furnaces, ceramic fiber insulation made with ceramic fibers that have extremely low heat capacity per unit volume and have excellent heat insulation properties, instead of refractory insulation bricks Has come to be used. However, since the ceramic fiber heat insulating material is porous, it has a problem that the strength against an external load is small, and foreign matter easily enters. For this reason, ceramic fiber insulation is required for the hearth, which is required to have enough strength to withstand the movement of the operator during construction of the furnace, strong mounting force to suppress thermal deformation of the electric heater and corrosion resistance to the falling scale during use. When applying a material, various methods are proposed (for example, refer patent documents 1-4).

JP-A-56-133583 Japanese Utility Model Publication No. 62-37110 Japanese Utility Model Publication No. 63-40785 JP 2000-274953 A

However, the construction method of the hearth described in Patent Documents 1 to 4 is more complicated than the construction method using the conventional fireproof and heat insulating brick. For this reason, when building the hearth of an industrial furnace using ceramic fiber insulation, in addition to the problem of material costs that ceramic fiber insulation is expensive compared to refractory insulation bricks, the construction cost is high. The problem is that the construction of the hearth is currently done using refractory bricks. For this reason, the problem that the furnace construction worker who has the special technique which piles up a fireproof heat insulation brick must be ensured arises.
Moreover, when constructing a hearth using a fireproof heat insulation brick, it stacks | stacks, adhering the fireproof heat insulation bricks with the adhesive called the mortar which provided the fluidity | liquidity with water. For this reason, when the industrial furnace is operated immediately after the construction of the furnace, the moisture in the mortar raises the dew point in the industrial furnace to cause rust in the furnace and lower the product quality. Therefore, it is indispensable to dry in advance when starting up an industrial furnace, but since drying is performed while gradually raising the temperature in the furnace, it takes a lot of time to complete the drying. And the total time required to start up the industrial furnace is increased. In particular, it is a big problem when a sufficient start-up period cannot be ensured, such as refurbishment or repair of an industrial furnace.

The present invention has been made in view of such circumstances, and it is intended to provide a construction method using a refractory heat insulating brick for a hearth that does not require a furnace builder having specialized skills, has a short construction period, and does not require prior drying. Objective.

The construction method using the refractory insulation brick of the hearth according to the present invention according to the above object is a construction method using the refractory insulation brick of the hearth that constructs the hearth by laying the fireproof insulation brick on the bottom of the industrial furnace. In
A plurality of the refractory insulating bricks are in direct contact with each other and combined in a predetermined shape and bundled with a heat-resistant ceramic rope to form a hearth brick block, and a heat-resistant ceramic fiber cushioning material is inserted between the hearth brick blocks. Then, the hearth brick block is arranged and spread on the bottom of the furnace.

In the construction method using the refractory insulating brick for the hearth according to the present invention, a plurality of through holes penetrating in the front-rear direction and the left-right direction of the hearth brick block are formed in the hearth brick block. It is preferable to insert a heat-resistant rod-shaped member.
Here, the rod-shaped member can be produced by solidifying a rod-shaped molded product formed of a ceramic fabric using a ceramic adhesive.
The ceramic adhesive may be water glass.

In the construction method using the refractory heat insulating brick for the hearth according to the present invention, a through hole is formed in a predetermined position of the refractory heat insulating brick in advance, and the penetration through the through hole is formed when the hearth brick block is formed. Preferably, holes are formed.

In the construction method using the refractory heat insulating brick for the hearth according to the present invention, the weight of the hearth brick block can be 20 kg or less.
The weight of the hearth brick block is more preferably 15 kg or less and 10 kg or more. By setting the weight of the hearth brick block to a range of 20 kg or less, the hearth brick can be efficiently constructed with a size within a range where the hearth brick block can be handled manually. Moreover, by setting the weight of the hearth brick block to 10 kg or more, the number of the hearth brick blocks to be used can be reduced, and the hearth can be efficiently constructed.

In the construction method using the refractory insulation bricks of the hearth according to claims 1 to 6, since the hearth is constructed by arranging the formed hearth brick blocks on the bottom of the hearth, a construction worker having specialized technology is secured. This eliminates the need for the construction of the furnace construction period, and makes it possible to shorten the construction period. Here, the hearth brick block is formed by combining a plurality of refractory heat-insulating bricks directly in contact with each other (in an open joint) and binding them with a heat-resistant ceramic rope so that drying at the time of startup is possible. This eliminates the need for shortening the startup time of the industrial furnace. In addition, since heat-resistant ceramic fiber cushioning materials such as ceramic fiber blankets and ceramic fiber paper are inserted between the hearth brick blocks, the thermal expansion of the fire-resistant and heat-insulating bricks is ensured even when the fire-resistant and heat-insulating bricks are in direct contact with each other. It can be absorbed by the ceramic fiber cushioning material, and can be prevented from being damaged by the pressure between the fireproof and heat insulating bricks. In addition, since the thermal expansion amount of a ceramic rope shows thermal expansion comparable as a refractory heat insulation brick, a ceramic rope does not break.

In particular, in the construction method using the refractory insulating brick for the hearth according to claim 2, the shape retaining property of the hearth brick block is improved and the handling of the hearth brick block becomes easy.
In the construction method using the refractory insulation brick for the hearth according to claim 3, the rod-shaped member is formed by forming a ceramic fabric into a rod shape and curing it using a ceramic adhesive, so that it matches the shape of the hearth brick block. Thus, it is possible to easily obtain the rod-shaped member having the optimum length.
In the construction method using the refractory heat insulating brick for the hearth according to claim 4, since the ceramic adhesive is water glass, it is easy to handle and a rod-shaped member can be easily produced.

In the construction method using the refractory heat insulating brick for the hearth according to claim 5, when the hearth brick block is formed, the through hole is formed by the communication of the through hole previously formed in the refractory heat insulating brick. Insertion of members becomes easy, and the construction period of the hearth brick block is shortened.

In the construction method using the refractory insulation brick for the hearth according to claim 6, since the weight of the hearth brick block is 20 kg or less, the handling of the hearth brick block can be performed manually, and the construction of the hearth is easy. Can be performed.

Subsequently, with reference to the attached drawings, the present invention relates to a construction method using a fireproof insulating brick for a hearth where an operator is placed and moved and an electric heater is installed at the time of construction (new construction, repair, or repair). In order to understand the present invention, embodiments of the present invention will be described.
Here, FIG. 1 is a perspective view of a hearth brick block in a state where an electric heater formed in the construction method using the fireproof heat-insulating brick for the hearth according to the first embodiment of the present invention is installed, and FIG. The perspective view of the hearth brick block main body formed in the construction method using the fireproof insulation brick of the hearth, FIG. 3 (A) is AA arrow sectional drawing of FIG. 2, (B) is B- of FIG. B sectional view, FIG. 4 (A) is the hearth brick block of the state in which the electric heater formed in the construction method using the fireproof heat insulation brick of the hearth which concerns on the 2nd Embodiment of this invention was installed. A perspective view, (B) is a front view of a hearth brick block with an electric heater formed in a construction method using fireproof insulation bricks of the hearth, and (C) is a fireproof insulation brick of the hearths. Electric heater formed by the construction method used is installed Plan view of the hearth bricks blocks, FIG. 5 is a perspective view of the hearth brick block body formed in a construction method using the insulating refractory bricks of the same hearth.

As shown in FIGS. 1 and 2, the hearth brick block 13 produced in the construction method using the hearth refractory heat insulating brick according to the first embodiment of the present invention includes a plurality of refractory heat insulating bricks 11. A plurality of through-holes that are formed by being bundled with an alumina rope 12 that is an example of a heat-resistant ceramic rope that is combined in a predetermined shape while being in direct contact, and that penetrate through the hearth brick block 13 in the front-rear direction and the left-right direction, respectively. 14 and 15 has alumina rod-like members 16 and 17 which are examples of heat-resistant rod-like members respectively inserted, and when laid down side by side on the bottom of the furnace, the heat-resistant ceramic fiber cushioning material is placed between the hearth brick blocks 13 As an example, alumina blankets 18 and 19 are inserted. Further, as shown in FIG. 1, the hearth brick block 13 is mounted using an attachment member 23 at a position where the electric heater 22 is one step away from the uppermost surface. This will be described in detail below.

The fire-resistant and heat-insulating brick 11 is made of, for example, an alumina material, exhibits heat resistance of 1000 to 1400 ° C., has a rectangular parallelepiped shape with a length of 230 mm, a width of 114 mm, and a height of 65 mm, and the weight per piece is 0.5 to 1 kg. Thereby, the size of the constructed hearth brick block 13 can be made large enough to hold a person, and the weight can be reduced to 20 kg or less. And as shown to FIG. 3 (A), (B), the chamfering part 20 is formed in the predetermined | prescribed corner | angular part of the fireproof heat insulation brick 11 according to the combination position at the time of forming the hearth brick block 13, and fireproofing is carried out. A through hole 21 is provided at a predetermined position of the heat insulating brick 11. Here, the inner diameter of the through hole 21 is set to a dimension in which the alumina rod-like members 16 and 17 can be fitted. By forming the chamfered portion 20 on the refractory heat-insulating brick 11, when the hearth brick block 13 is formed by combining the refractory heat-insulating brick 11, the corner portions can be prevented from colliding with each other and the corner portions can be prevented from being damaged. When the floor brick block 13 is laid and placed on the bottom of the furnace of an industrial furnace, it is possible to prevent the corners of the hearth brick block 13 from hitting each other and damaging the corners. Moreover, by forming the through hole 21 in a predetermined position of the refractory heat insulating brick 11 in advance, the through holes 14 and 15 can be formed by the communication of the through hole 21 when the hearth brick block 13 is formed.

The alumina rope 12 is formed, for example, by twisting alumina long fibers exhibiting heat resistance of 1000 to 1400 ° C., and has a diameter of 5 to 7 mm.
The alumina blankets 18 and 19 are, for example, a molded body having an alumina fiber thickness of 5 to 7 mm and a heat resistance of 1000 to 1400 ° C. The cut pieces are inserted between the front and rear end faces and the left and right end faces of the adjacent hearth brick block 13.

The alumina rod-like members 16 and 17 are, for example, long sleeves (an example of a ceramic fabric) formed by knitting a string made of alumina-based long fibers exhibiting heat resistance of 1000 to 1400 ° C. in a predetermined length. After cutting the sleeve piece into both ends, the both ends of the cut sleeve piece are contracted in the radial direction to make the string into a compacted state (a rod-shaped product), and then solidified with water glass, which is an example of a heat-resistant ceramic adhesive. The diameter is 5-7 mm, for example. By setting the length of the sleeve piece in consideration of the length of the through holes 14 and 15 formed in the hearth brick block 13 and the elongation rate of the sleeve piece, the alumina rod-like members 16 and 17 having the optimum length can be obtained. Can be easily obtained. By inserting alumina rod-like members 16 and 17 into through holes 14 and 15 formed in the front-rear direction and the left-right direction of the hearth brick block 13, respectively, each refractory heat insulating brick 11 constituting the hearth brick block 13 is inserted. Can be prevented from occurring.

Then, the construction method using the fireproof heat insulation brick of the hearth which concerns on the 1st Embodiment of this invention is demonstrated.
As shown in FIG. 1, the shape of the hearth brick block 13 is determined by dividing (blocking) the hearth to be constructed into a weight of 10 to 20 kg or less, preferably 10 to 15 kg or less. When the shape of the hearth brick block 13 is determined, the combination method of the refractory heat insulating bricks 11 is also determined. Therefore, first, based on the combination position when the hearth brick block 13 is formed, the through hole 21 penetrating the predetermined position of each fireproof heat insulating brick 11 is provided, and the fireproof heat insulating brick 11 that further requires the chamfered portion 20 is provided. A chamfer 20 is formed at a predetermined corner. Further, when the shape of the hearth brick block 13 is determined, the lengths of the through holes 14 and 15 formed in the hearth brick block 13 are also found, so that a predetermined length of sleeve is formed from a long sleeve formed by knitting an alumina string. The length of the sleeve piece is cut out and both ends thereof are stretched to bring the strings into a compacted state, and then solidified using water glass to form the alumina rod-like members 16 and 17.

Next, the fire-resistant and heat-insulating bricks 11 subjected to the processing of the through holes 21, the chamfered portions 20, and the through holes 21 are combined while being in direct contact with each other, and bundled with an alumina rope 12 to form a hearth brick block 13. Here, in the front-rear direction and the left-right direction of the formed hearth brick block 13, through-holes 14, 15, each having a through-hole 21, are formed. Therefore, alumina rod-like members 16 and 17 prepared in advance are inserted into the through holes 14 and 15, respectively. By inserting alumina rod-like members 16 and 17 into the through holes 14 and 15 of the hearth brick block 13, respectively, the fireproof and heat-insulating bricks 11 that are bound by the alumina rope 12 and constitute the hearth brick block 13 are in the form of alumina rods. It can fix using the members 16 and 17, and even if shear force acts from the front-back direction and the left-right direction of the hearth brick block 13, it can prevent reliably that a fireproof heat insulation brick 11 arises.

Subsequently, alumina blankets 18 and 19 cut and molded in accordance with the shapes of the front and rear end faces and the left and right end faces of the hearth brick block 13 are inserted between the hearth brick blocks 13, and the hearth brick block 13 is made into an industrial furnace. The hearth is constructed by laying down while pressing the hearth brick blocks 13 so that the alumina blankets 18 and 19 are, for example, half the thickness. Here, since the weight of the hearth brick block 13 is adjusted to 20 kg or less, handling of the hearth brick block 13 and laying work on the bottom of the hearth are facilitated. Furthermore, since the refractory heat insulating bricks 11 are fixed to each other by the alumina rope 12 and the alumina rod-like members 16 and 17, the shape retaining property of the hearth brick block 13 is improved, and the laying work of the hearth brick block 13 is efficiently performed. Can be done.

In the hearth constructed in this way, since the refractory heat insulating bricks 11 are not joined with mortar, drying at the time of start-up becomes unnecessary, and the start-up time of the industrial furnace can be shortened. Further, since the refractory and heat insulating bricks 11 are in direct contact with each other in the hearth brick block 13, the adjacent hearth brick blocks 13 expand to each other when the industrial furnace is started up and used, but the adjacent hearth bricks are adjacent to each other. Since there is a compacted alumina blanket 18, 19 between the brick blocks 13, these thermal expansions are absorbed by the alumina blanket 18, 19, and breakage due to pressing between the refractory heat insulating bricks 11. Can be prevented. In addition, since the thermal expansion coefficient of the alumina rope 12 and the alumina rod-shaped members 16 and 17 is approximately the same as the thermal expansion coefficient of the refractory heat-insulating brick 11, the alumina rope 12 may break when the industrial furnace is started up and used. The alumina rod-like members 16 and 17 are not broken. For this reason, the hearth brick block 13 in use can be taken out at the time of repairing or repairing the industrial furnace.

As shown in FIGS. 4 and 5, the hearth brick block 24 produced in the construction method using the refractory heat insulating brick for the hearth according to the second embodiment of the present invention is shown in FIGS. 1 and 2. The range to be blocked is narrower than that of the hearth brick block 13, and the hearth is composed of the hearth brick block 24 and the refractory heat insulating brick 25. For this reason, the hearth brick block 24 is reduced in weight, and the hearth brick block 24 can be integrated only by the alumina rope 12. In the hearth brick block 24, a groove 26 in which the alumina rope 12 is accommodated is formed in advance at a portion where the alumina rope 12 contacts. Thereby, it can prevent that the alumina rope 12 slip | deviates.

In the construction method using the refractory heat insulating brick for the hearth according to the second embodiment of the present invention, the hearth brick block 24 and the refractory heat insulating brick 25 are alternately arranged in the furnace width direction of the hearth, An alumina blanket 27 having a shape is inserted between the block 24 and the refractory heat insulating brick 25. On the other hand, since a row of hearth brick blocks 24 and a row of refractory heat insulating bricks 25 are formed in the furnace longitudinal direction, alumina blankets 28 each having a shape are inserted between the hearth brick blocks 24, respectively. Between the fireproof and heat insulating bricks 25, for example, alumina blankets 29 each having a shape are inserted into joints of the fireproof and heat insulating bricks 25 that are present at intervals corresponding to the length of the hearth brick block 24.
Since the hearth brick block 24 can be fastened only to the alumina rope 12 by reducing the weight, workability is improved. Further, in the hearth brick block 24, the processing contents are simplified and the processing amount is reduced as compared with the hearth brick block 13 of the first embodiment, and the manufacturing cost can be reduced.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, as a rod-shaped member, an alumina woven fabric or alumina paper having a predetermined width may be wound to form a rod-shaped molded product, and the rod-shaped molded product may be solidified with water glass to form an alumina rod-shaped member. Further, instead of water glass, an alumina high temperature adhesive in which fine alumina powder is dispersed in an organic adhesive liquid can be used. Furthermore, an alumina-siliceous rope may be used as the ceramic rope.
Furthermore, in the embodiment of the present invention, the alumina blanket is cut and inserted into an appropriate size between the hearth brick blocks, but the front and rear and left and right end faces of the hearth brick block are covered with alumina blankets in advance. You can also.

Moreover, although the alumina blanket was used as the ceramic fiber cushioning material, alumina paper having a predetermined thickness can also be used. When alumina paper is used, it is not necessary to lay down while pressing the hearth brick blocks, and the operation of laying the hearth brick blocks becomes easy.
Furthermore, when a through hole was formed in advance by forming a through hole in the refractory insulating brick and the hearth brick block was formed, a through hole was formed, but after forming a hearth brick block by combining the refractory insulating brick, You may make it form a through-hole with a drill. When forming a through-hole with a drill, the hearth brick block which requires the high precision for the pre-processing of a fireproof heat insulation brick can be formed in a short time.

It is a perspective view of the hearth brick block of the state in which the electric heater formed in the construction method using the fireproof heat insulation brick of the hearth which concerns on the 1st Embodiment of this invention was installed. It is a perspective view of the hearth brick block main body formed in the construction method using the fireproof heat insulation brick of the same hearth. (A) is AA arrow sectional drawing of FIG. 2, (B) is BB arrow sectional drawing of FIG. (A) is a perspective view of the hearth brick block in the state where the electric heater formed in the construction method using the fireproof heat insulating brick of the hearth according to the second embodiment of the present invention is installed, (B) is the same Front view of the hearth brick block with the electric heater formed in the construction method using the refractory insulation brick of the hearth, (C) is the electric heat formed in the construction method using the refractory insulation brick of the hearth It is a top view of the hearth brick block in the state where the heater was installed. It is a perspective view of the hearth brick block main body formed in the construction method using the fireproof heat insulation brick of the same hearth.

Explanation of symbols

11: Fireproof heat insulating brick, 12: Alumina rope, 13: Hearth brick block, 14, 15: Through hole, 16, 17: Alumina rod-shaped member, 18, 19: Alumina blanket, 20: Chamfered part, 21: Through hole, 22: electric heater, 23: mounting member, 24: hearth brick block, 25: fireproof and heat insulating brick, 26: groove, 27, 28, 29: alumina blanket

Claims (6)

In the construction method using the refractory heat insulation bricks of the hearth to construct the hearth by laying refractory heat insulation bricks on the bottom of the furnace of the industrial furnace,
A plurality of the refractory insulating bricks are in direct contact with each other and combined in a predetermined shape and bundled with a heat-resistant ceramic rope to form a hearth brick block, and a heat-resistant ceramic fiber cushioning material is inserted between the hearth brick blocks. A method of constructing a hearth brick using refractory heat-insulating bricks, characterized in that the hearth brick blocks are arranged and spread on the bottom of the hearth. The construction method using the fireproof heat-insulating brick for the hearth according to claim 1, wherein a plurality of through holes penetrating in the front-rear direction and the left-right direction of the hearth brick block are formed in the hearth brick block. A construction method using a fire-resistant and heat-insulating brick for a hearth, wherein a heat-resistant bar-like member is inserted into the hearth. The construction method using the fireproof heat insulation brick of the hearth of Claim 2 WHEREIN: The said rod-shaped member solidifies the rod-shaped molding formed with the ceramic fabric using a ceramic adhesive agent, The hearth characterized by the above-mentioned. Construction method using fireproof and heat insulating bricks. The construction method using the fireproof heat-insulating brick for the hearth according to claim 3, wherein the ceramic adhesive is water glass. In the construction method using the refractory heat insulation brick of the hearth according to any one of claims 2 to 4, a through hole was previously formed in a predetermined position of the refractory heat insulation brick, and the hearth brick block was formed. The construction method using the refractory heat insulating brick of the hearth, wherein the through hole is formed by the communication of the through hole. In the construction method using the refractory heat insulation brick of the hearth of any one of Claims 1-5, the weight of the said hearth brick block shall be 20 kg or less, The refractory heat insulation brick of the hearth characterized by the above-mentioned. The construction method used.

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