KR102143613B1 - chute liner for thermoelectric power plants and ironworks and manufacturing the same - Google Patents

Abstract

The present invention relates to a wear-resistant ceramic chute liner for a thermal power plant and a steel mill, comprising a base portion formed of a steel material and forming a square bottom surface, and a border portion extending upward from the edge of the base portion to form an internal accommodation space. However, the inner side of the rim portion is formed to be inclined toward the center as it proceeds upwards, so that the inner width of the inner receiving space gradually narrows as the inner width of the inner receiving space proceeds upward, and the floor is accommodated in the inner receiving space of the steel housing to suppress separation. Between the ceramic liner and the base part to absorb the impact of mineral powder colliding with the ceramic lighter and the ceramic liner formed of ceramic material so that the inner width gradually decreases as it progresses upward along the extension direction of the edge part from the bottom opposite the surface. Equipped with a shock absorbing pad. According to such a wear-resistant ceramic chute liner for thermal power plants and steel mills and its manufacturing method, it is possible to extend the service life by suppressing the separation and damage of the ceramic liner due to the drop impact of coal, and to prevent frequent maintenance and replacement. It provides the advantage of enabling the efficient operation of the coal handling facility system.

Description

Wear-resistant ceramic chute liner for thermal power plants and steel mills, and manufacturing method thereof {chute liner for thermoelectric power plants and ironworks and manufacturing the same}

The present invention relates to a wear-resistant ceramic chute liner applied to a coal handling facility system of a thermal power plant and a steel mill, and in detail, it is possible to suppress the separation, abrasion, and damage of the wear-resistant ceramic liner due to intensive fall of coal. It relates to a wear-resistant ceramic chute liner for thermal power plants and steel mills, and a method of manufacturing the same.

Thermal power plants using coal as the main raw material supply finely powdered pulverized coal together with air to burn it in a boiler, and to generate power by rotating the turbine by vaporizing water in a water pipe piped in the boiler.

Such a thermal power plant typically pulverizes coal into fine-sized pulverized coal and supplies it through a pulverized coal main supply pipe, a blower that supplies air through the pulverized coal main supply pipe, and a mixture of pulverized coal and air transported through the pulverized coal main supply pipe. Equipped with a boiler that is supplied and burned.

In addition, most coal, which is a raw material for thermal power plants, is unloaded from a ship loaded with coal to an unloading machine, and is loaded into a storage yard using a conveyor as a transport means, and the coal stacked in the storage yard is transferred according to the required process. It goes through the process of transferring using the inner conveyor belt and the upper/lower tanker. In this way, a chute for collecting coal falling through a conveyor belt having a different height difference between the conveyor belt and the conveyor belt or through the final conveyor belt is provided on the transfer path for transferring the coal. A chute liner is attached to the chute body so as to suppress abrasion from a contact impact caused by falling coal. A steel plate is applied to the conventional chute liner, and the domestic registered utility model No. 0345951 discloses a chute liner fixing device.

However, since the conventional chute liner is made of a steel plate, there is a disadvantage in that the replacement cycle is short due to a high speed of wear due to falling coal.

Meanwhile, a method of attaching a ceramic liner to protect equipment by preventing abrasion caused by coal intensively pouring into the chute liner is also applied. However, ceramic liners have excellent abrasion resistance, but are easily damaged due to weak shock absorption, or are experiencing considerable difficulties in the normal operation of coal facilities due to problems in which the ceramic lighters are separated from the frame.

The present invention was invented to solve the above-described problems in the related art, and a wear-resistant ceramic chute liner for thermal power plants and steel mills capable of prolonging the service life by improving the impact absorption efficiency of fallen coal while suppressing the separation of the ceramic liner. And to provide a method for manufacturing the same.

In order to achieve the above object, the wear-resistant ceramic chute liner for a thermal power plant and a steel mill according to the present invention is formed of a steel material and has a base portion forming a square bottom surface, and an internal accommodation space extending upward from the edge of the base portion. A steel housing having a border forming a rim, wherein the inner surface of the rim portion is formed to be inclined toward the center as it proceeds upward so that the inner width of the inner accommodation space gradually narrows as the inner width proceeds upward; A ceramic liner that is accommodated in the inner receiving space of the steel housing and is formed of a ceramic material so that the inner width gradually decreases as it progresses upward along the extending direction of the edge portion from the bottom surface opposite to the bottom surface to suppress separation; And a shock absorbing pad mounted between the ceramic liner and the base portion to absorb the impact of the mineral powder impinging on the ceramic lighter.

Preferably, the ceramic liner is Al ₂ O ₃ 87 to 96 wt%, CaO 0.5 to 2 wt%, kaolin 0.5 to 2 wt%, talc 0.5 to 1 wt%, ZrO ₂ 1 to 4 wt%, CeO ₂ 0.5 to 2 wt%, La ₂ O ₃ 1 to 2 What is formed in weight percent is applied.

In addition, the impact absorbing pad is bonded to at least one flat plate portion formed to extend in a plate shape, and at least one of the top and bottom surfaces of the flat plate portion, but is formed to extend in a wave shape to form an air layer between the flat plate portion. Apply the one formed in a structure with a wrinkle part.

In addition, the impact absorbing pad has an elastic silicone adhesive applied to the base portion and the bottom surface is bonded, and the edge portion and the side surface of the impact absorbing pad are bonded with elastic silicone adhesive.

In addition, in order to achieve the above object, the method of manufacturing a wear-resistant ceramic chute liner for a thermal power plant and a steel mill according to the present invention is a. Forming a base portion forming a square bottom surface; I. Bonding an edge portion extending upward along an edge to the three sides of the base portion, the inner surface being inclined toward the center as it proceeds upward; All. Applying a silicone adhesive to the bottom surface of the base portion and bonding a shock absorbing pad; la. Applying a silicone adhesive to the inner surface of the edge portion; hemp. Inserting a ceramic liner formed of a ceramic material through the open space of the edge portion, the inner width of which is formed to gradually decrease from the bottom surface to the upper portion along the extending direction of the edge portion on the shock absorbing pad; bar. And joining the edge portion formed to be inclined toward the center as the inner surface extends upward along the edge on the other surface of the base portion.

According to the wear-resistant ceramic chute liner for a thermal power plant and a steel mill according to the present invention and a method for manufacturing the same, it is possible to extend the service life by suppressing the separation and damage of the ceramic liner due to the dropping impact of coal, and frequent maintenance and replacement. It provides the advantage of enabling the efficient operation of the coal handling facility system by preventing it.

1 is a schematic cross-sectional view showing a coal handling facility system to which a wear-resistant ceramic chute liner according to the present invention is applied,
2 is a perspective view showing an excerpt of the ceramic chute liner of FIG. 1,
3 is a cross-sectional view of the ceramic chute liner of FIG. 2,
4 is an exploded perspective view showing a part of the steel housing of FIG. 2 by exploding,
5 is a perspective view showing an extract of the shock absorbing pad applied to FIG. 3,
6 is a perspective view showing a shock absorbing pad according to another embodiment of the present invention,
7 is a flow diagram showing the manufacturing process of the ceramic chute liner according to the present invention,
FIG. 8 is a perspective view showing an assembly state corresponding to the manufacturing process of FIG. 7 for each process.

Hereinafter, a wear-resistant ceramic chute liner for a thermal power plant and a steel mill according to a preferred embodiment of the present invention and a method of manufacturing the same will be described in more detail with reference to the accompanying drawings.

1 is a schematic cross-sectional view showing a coal handling facility system to which a wear-resistant ceramic chute liner according to the present invention is applied, FIG. 2 is a perspective view showing an extract of the ceramic chute liner of FIG. 1, and FIG. 3 is a ceramic of FIG. It is a cross-sectional view of the chute liner, and FIG. 4 is an exploded perspective view showing a part of the steel housing of FIG. 2 in an exploded view.

1 to 4, a wear-resistant ceramic chute liner 100 according to the present invention includes a steel housing 101, a ceramic liner 130, and an impact absorbing pad 140.

In the illustrated example, the ceramic chute liner 100 is mounted on the chute 10 of the upper/lower tanker temporarily receiving coal falling from the conveyor belt 30 for transporting the coal 40.

The steel housing 101 is formed of steel, that is, a steel plate and has an inner receiving space 114 that can be accommodated in a constrained state so as to suppress separation of the ceramic liner 130 to be described later, and has an open square frame shape. The steel housing 101 is divided into a base portion 110 and a border portion 120.

The base portion 110 is formed of a plate-shaped steel material and forms a square bottom surface. The base portion 110 is formed with a plurality of seating support grooves 112 that can be accommodated and supported in a restrained state of the head portion 111a of the support bolt 111 to be described later, spaced apart from each other. In the illustrated example, the head 111a of the support bolt 111 is formed in a shape whose outer diameter gradually decreases toward the body 111b, and the seating support groove 112 also accommodates the head 111a. However, the outer diameter is formed to gradually decrease as it progresses from the top to the bottom so that departure to the bottom is suppressed.

The support bolt 111 is mounted to be inserted into the seating support groove 112 formed in the base portion 110. The support bolt 111 is applied to be used as an anchor bolt capable of fixing the ceramic chute liner 100 on the inner surface of the body 20 of the chute 10 of the upper/lower loading machine for handling coal.

The rim portion 120 is a portion extending upward from the edge of the upper surface of the base portion 110 to form an internal accommodation space. The inner surface 120a of the border portion 120 is formed to be inclined toward the center as it proceeds upward, so that the inner width of the inner receiving space 114 of the steel housing 101 is gradually narrowed as it proceeds upward. The outer surface of the rim portion 120 is formed to extend vertically with respect to the base portion 110 so that it can be closely assembled with the other steel housing 101.

In consideration of the assembly process of the shock absorbing pad 140 and the ceramic liner 130, which will be described later, the rim portion 120 is first bonded to three of the four surfaces along the edge of the base portion 110 so that one side can be After the shock absorbing pad 140 and the ceramic liner 130 are mounted to be accommodated, and then the other edge part 120 is joined so that the horizontally open part is closed. In order to facilitate the bonding operation of the edge portion 120 to be bonded, it may be formed in a structure that can be fitted together. That is, a fitting groove 120c inserted into the inside is formed at the end of the edge portion 120 that is first continuously bonded to the three surfaces of the base portion 110, and the shock absorbing pad 140 and the ceramic liner 130 After mounting so as to be accommodated, a structure having a fitting protrusion 120d so as to be inserted into the fitting groove 120 is applied to the last edge portion 120 to which the horizontally open portion is joined to be closed. The rim portion 120 is fitted with each other to prevent distortion during welding. The edge portions 120 are bonded to each other by ultra-low temperature welding.

The ceramic liner 130 is accommodated in the inner accommodation space 114 of the steel housing 101, but the vertical direction of the rim portion 120 from the bottom surface opposite to the upper surface of the base portion 110 corresponding to the bottom surface so as to suppress separation. It is formed in the shape of a square plate with an inclined edge so that the inner width gradually decreases as it progresses upward along the extension direction of the furnace. It goes without saying that the ceramic liner 130 is manufactured as a single body, but is divided into a plurality of pieces in consideration of the size of the suit and manufactured to be integrated.

The stew-chill ceramic liner 130 is formed by mixing ceramic raw materials and pulverizing fine powder into a molding mold, pressing and molding, and firing.

Preferably, the ceramic liner 130 is alumina (Al ₂ O ₃ ) 87 to 96 wt%, calcium carbonate (CaO) 0.5 to 2 wt%, kaolin 0.5 to 2 wt%, talc 0.5 to 1 wt%, zirconia (ZrO) ₂ ) 1 to 4% by weight, cesium oxide (CeO ₂ ) 0.5 to 2% by weight, lanthanum oxide (La ₂ O ₃ ) 1 to 2% by weight is applied.

Alumina (Al2O3), the main component, is a material with excellent physical properties such as abrasion resistance and strength, and excellent chemical resistance. It is the most excellent material for price/performance among the abrasion resistance materials currently in use.

Kaolin added to alumina gives strength to ceramic materials, increases plasticity of raw materials, and improves formability, enabling precise product molding. If the amount of kaolin is less than 0.5% by weight, it is difficult to improve plasticity, and if it exceeds 2% by weight, the molding ability is improved, but the strength of the ceramic liner is lowered.

Calcium carbonate (CaO) serves to increase the density of the sintered body by inhibiting grain growth during the sintering process and preventing separation of pores from the grain boundary when the grain boundary moves during the sintering process.

If the amount of calcium carbonate (CaO) added is less than 0.5% by weight, it is difficult to inhibit grain growth, and if it exceeds 2% by weight, the efficiency of inhibiting grain growth decreases.

Talc facilitates firing by lowering the firing temperature during firing and reduces firing costs. If the amount of talc added is less than 0.5% by weight, the effect of lowering the firing temperature is reduced, and if it exceeds 1% by weight, the increase in the effect of lowering the firing temperature becomes insignificant.

Zirconia (ZrO ₂ ) improves the density when manufacturing a sintered body to increase strength, improve wear resistance, and increase mechanical strength. If the amount of zirconia (ZrO ₂ ) added is less than 1% by weight, the effect of increasing the strength is small, and if it exceeds 4% by weight, it is oversupplied, resulting in an increase in shrinkage.

Cesium oxide (CeO ₂ ) extends the life of the chute liner 130 by increasing wear resistance. If the amount of cesium oxide (CeO2) is less than 0.5% by weight, the effect of increasing abrasion resistance is small, and even if it contains more than 2% by weight, a cost problem compared to the effect of increasing abrasion resistance occurs.

Lanthanum oxide (La ₂ O ₃ ) is effective in increasing the strength and abrasion resistance of ceramics by suppressing the phase transition of alumina during sintering and preventing abnormal grain growth. When lanthanum oxide (La ₂ O ₃ ) is added less than 1%, the effect does not occur, and when it is added in excess of 2%, the sintering properties are reduced, which adversely affects the sintered product.

The shock absorbing pad 140 is mounted between the ceramic liner 130 and the base portion 110 to absorb the impact of mineral powder such as coal colliding with the ceramic liner 130.

The shock absorbing pad 140 is formed to increase the shock absorbing efficiency, and an example thereof will be described with reference to FIG. 5.

Referring to FIG. 5, the shock absorbing pad 140 has a structure having a flat plate portion 141 and a wrinkle portion 142.

The flat plate portion 141 is a portion formed by extending in a plate shape, and a square plate shape corresponding to the size of the base portion 110 so as to be accommodated may be applied.

The corrugated portion 142 is joined at each of the upper and lower surfaces of the flat plate portion 141, but is formed to extend in a wave shape by bending the plate-shaped sheet in a corrugated manner, so that air flows between the upper and lower surfaces of the flat plate portion 141. ) To form.

The shock absorbing pad 140 may be formed of a material capable of elastically deforming, for example, a soft rubber material or a silicone material.

Unlike this, the shock-absorbing pad 140 may have an air layer 142a between the two flat portions 141 as shown in FIG. have.

The shock absorbing pad 140 has an elastic silicone adhesive 145 applied to the base portion 110, and the bottom surface is bonded, and the side surface of the edge portion 120 and the shock absorbing pad 140 and a ceramic liner ( The side of 130) is adhesively treated with a silicone adhesive 150 having elasticity.

Hereinafter, a manufacturing process of the ceramic straitliner 100 will be described with reference to FIGS. 7 and 8.

First, a base portion 110 for forming a square bottom surface is formed by laser processing a steel sheet as a raw material (step 310). In addition, a rim portion 320 with an inclined inner surface is formed (step 320). Here, the rim part 320 manufactures a part corresponding to three sides of the base part 110 and a part corresponding to the other side, or manufactures four parts corresponding to each side of the base part 110, respectively. It can be manufactured by applying any one of the following methods.

Next, the edge portion 120 formed to be inclined toward the center is extended upwardly along the edge on the three sides of the base portion 110, but the inner side is joined by welding (step 330). Here, the support bolt 111 is mounted before welding of the rim portion 120, or after welding the rim portion 120 to the three surfaces of the base portion 110.

Thereafter, a silicone adhesive 145 is applied to the bottom surface of the base portion 110, and the shock absorbing pad 140 enters through the side opening in which the edge portion 120 is opened to be adhesively bonded (step 340).

The upper surface of the shock absorbing pad 140 as a preparation process for mounting the ceramic liner 130, which will be described later, while the silicone adhesive 145 is cured and the shock absorbing pad 140 does not move with respect to the base portion 110. And a silicone adhesive 150 is applied to the inner surface of the rim portion 120 (step 350).

After that, the ceramic liner 130 is inserted through the open space of the edge portion 120 so that the ceramic liner 130 is seated on the shock absorbing pad 140 and attached to the shock absorbing pad (step 360).

In addition, after applying the silicone adhesive 150 to the open side of the ceramic liner 130, the remaining bar-shaped edge portion 120 forming the inner receiving space 114 on the other side of the base portion 110 last. Are joined by welding (step 370).

The ceramic chute liner 100 manufactured through this manufacturing process can suppress the damage of the ceramic liner 130 due to the impact of coal by the shock absorbing pad 140 and the silicone adhesive 145, 150, and Since the ceramic liner 130 is structurally mounted to the housing 101 to suppress separation, the service life can be extended, thereby preventing maintenance and replacement, thereby providing the advantage of enabling efficient operation of the coal handling facility system. do.

Such a ceramic chute liner can be installed and used in a suit for coal or mineral transport facilities such as cement manufacturing facilities and mines, as well as thermal power plants and steel mills.

101: steel housing 130: ceramic liner
140: shock absorbing pad

Claims (6)

delete It is formed of a steel material and has a base portion forming a square bottom surface, and an edge portion extending upward from the edge of the base portion to form an internal accommodation space, but the inner surface of the edge portion is formed to be inclined toward the center as it proceeds upward. A steel housing formed to gradually narrow as the inner width of the inner receiving space proceeds upward;
A ceramic liner made of a ceramic material to be accommodated in the inner receiving space of the steel housing and gradually decrease its inner width as it progresses upward along the extending direction of the edge portion from the bottom surface opposite to the bottom surface to suppress separation;
And a shock absorbing pad mounted between the ceramic liner and the base portion to absorb the impact of the mineral powder colliding with the ceramic liner,
The ceramic liner is Al ₂ O ₃ 87 to 96 wt%, CaO 0.5 to 2 wt%, Kaolin 0.5 to 2 wt%, Talc 0.5 to 1 wt%, ZrO ₂ 1 to 4 wt%, CeO ₂ 0.5 to 2 wt% , La ₂ O ₃ Wear-resistant ceramic chute liner, characterized in that formed of 1 to 2% by weight. The method of claim 2, wherein the impact absorbing pad is bonded to at least one plate portion formed to extend in a plate shape, and at least one of an upper surface and a bottom surface of the plate portion, but is formed to extend in a wave shape, and is formed between the plate portion. Wear-resistant ceramic chute liner, characterized in that formed in a structure having a corrugated portion forming an air layer. The method of claim 3, wherein the shock absorbing pad has an elastic silicone adhesive applied to the base portion, and the bottom surface is adhesively treated, and the edge portion and the side surface of the shock absorbing pad are adhesively treated with an elastic silicone adhesive. Wear-resistant ceramic chute liner, characterized in that. delete end. Forming a base portion forming a square bottom surface;
I. Bonding an edge portion extending upward along an edge to the three sides of the base portion, the inner surface being inclined toward the center as it proceeds upward;
All. Applying a silicone adhesive to the bottom surface of the base portion and bonding a shock absorbing pad;
la. Applying a silicone adhesive to the inner surface of the edge portion;
hemp. Inserting a ceramic liner formed of a ceramic material through the open space of the edge portion, the inner width of which is formed to gradually decrease as it progresses upward from the bottom of the impact absorbing pad along the extending direction of the edge portion;
bar. Including; and joining the edge portion formed to be inclined toward the center as the inner surface is extended upward along the edge to the other surface of the base portion, as it proceeds upward, and
The ceramic liner is Al ₂ O ₃ 87 to 96 wt%, CaO 0.5 to 2 wt%, Kaolin 0.5 to 2 wt%, Talc 0.5 to 1 wt%, ZrO ₂ 1 to 4 wt%, CeO ₂ 0.5 to 2 wt% , La ₂ O ₃ Method for producing a wear-resistant ceramic chute liner, characterized in that formed in 1 to 2% by weight.

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