KR20100129548A - Method for making fire proofing wall of incinerator with heat resisting steel blocks - Google Patents

Abstract

PURPOSE: A method for building a fireproof wall of an incinerator using heat resistant steel blocks is provided to facilitate the maintenance and repair of fireproof walls of an incinerator by preventing thermal deformation of heat resistant steel blocks and damage by a clinker even under the high temperature of the incinerator. CONSTITUTION: A method for building a fireproof wall of an incinerator comprises steps of: installing heat resistant steel blocks in the location of fireproof blocks adjacent to a side of a fire grate so that the front side is arranged on the same plane as a fireproof wall, and finishing by filling castable mortar between the adjacent heat resistance steel blocks and the fireproof blocks. Each heat resistance steel block is composed of a casing(100) with backside open and castable filled inside the casing.

Description

Method for Making Fire Proofing Wall Of Incinerator With Heat Resisting Steel Blocks}

The present invention relates to a fireproof wall construction method for incinerators using heat-resistant steel blocks, in particular clinker is attached to the surface to prevent damage of the fireproof wall by clinker attachment in the wall consisting of a refractory block of stepped incinerator composed of movable and fixed grate The present invention relates to a method of constructing a fireproof wall using heat resistant steel blocks which are not thermally deformed.

In general, most of the waste which can not be landfilled and incinerated as a method of treating general household waste or industrial waste is incinerated and disposed of. Such waste incineration is processed at a high temperature of more than 850 degrees to prevent the generation of dioxin, and the burner is ignited with fuel such as diesel and LNG to raise the temperature of the incinerator to a predetermined temperature, and then the burner is stopped and the waste is introduced through the hopper. It is ignited and combusted by the incinerator's elevated temperature inside, and the waste is completely burned while being moved by a grate operated by a ramp pusher in the combustion stage.

An example of such a waste treatment incinerator is shown schematically in FIG. 1. The combustible waste introduced into the hopper 2 of the incinerator 1 is incinerated with the combustion burner 4 while being moved to the grate apparatus 3. The grate device is composed of a stepped alternately grate grate 6 and a fixed grate 7 as shown schematically in Figure 2, the movable grate is moved horizontally by the ramp pusher (8) on the fixed grate The waste present is burned while moving downwards.

However, when the plastics are not completely burned in these incinerators, incineration products generated by mixing with metals or glass components in the wastes, or incineration products called clinkers during incineration and carbonization of wastes such as coal and charcoal, are generated. As the product is firmly attached in response to the refractory brick constituting the incinerator wall, it hinders the operation of the working grate and causes a failure, so the incinerator is stopped, the clinker is removed from the incinerator wall, and the damaged refractory brick is replaced. Maintenance work, etc. should be done. As such, shutdown of the incinerator due to the clinker results in a reduction in the number of days of operation and a significant cost loss due to fuel consumption during the temperature increase during restart.

In order to prevent the clinker from being attached to the refractory brick in the incinerator, a metal plate is conventionally attached to the refractory brick surface inside the incinerator by bolts or by means of fastening means such as bolts, or by installing a water cooling jacket and circulating the coolant to circulate the cooling water. Is generated to prevent the clinker from being integrally attached to the surface of the fireproof wall, so that a predetermined size is eliminated by its own load.

However, the method of attaching the metal plate to the refractory brick is not easy to withstand high temperatures of 850 to 1200 degrees in an incinerator and is easily deformed. In this case, there is a problem that may interfere with the movement of waste and grate, and water cooling jacket is used. The method may be expensive and the water cooling jacket may be damaged by corrosion, in which case the maintenance and repair of the incinerator need to be stopped and repaired.

In order to solve the problem of refractory brick damage in such an incinerator, the refractory brick replacement liner of the incinerator in Korean Patent No. 10-0859588 has a refractory brick layer 9 adjacent to the grate 8, as shown in FIG. 3 is replaced with a refractory brick replacement liner 13 having a slip plate 12 detachably coupled by a coupling means 11 to a fixed member 10 embedded in the fire resistant wall, shown in exploded view in FIG. In addition, the slip plate 12 forms a doyle plane with the fire wall or protrudes by a small distance so that the grate and the slip plate 12 contact each other, thereby preventing the fire brick and the grate from contacting and wearing. When slip plate wear is proposed to install a liner on the fireproof wall by assembling a new slip plate separated from the fixing member (10).

However, since the slip plate 12 and the liner 13 for replacing the refractory bricks have an assembly structure and cannot fill the fireproof material therein, there is a problem that the inside is made of an empty box shape, and thus the thermal insulation function is deteriorated. As the front part exposed by thermal expansion is inflated, excessive contact with the grate occurs, causing excessive wear, which may shorten the life or stop the operation of the grate.

The object of the present invention is to solve the problem of the block for replacing the heat-resistant brick of the conventional incinerator described above, the heat-resistant steel block to improve heat resistance and minimize deformation due to thermal expansion of the incineration process, improve durability and prevent damage to the grate It is to provide a fireproof wall construction method for the incinerator.

Fireproof wall construction method for an incinerator according to the present invention for achieving the above object is incinerator fireproofing by inserting the heat-resistant steel block in the firebrick position adjacent to the grate to prevent damage of the firebrick by the attachment of clinker generated in the incinerator In the wall construction method, a fireproof wall is formed at a location of a firebrick adjacent to the side of the grate. The front face is installed on the same plane, and the castable mortar is filled between the adjacent heat-resistant steel blocks and the refractory bricks.

The castable consists of 62-85% by weight of powdered aluminum oxide, 16-38% by weight of silicon dioxide, 1-2% by weight of calcium oxide, 0.0-1.5% by weight of iron oxide, and 0.0-1% by weight of magnesium oxide. The mixture is mixed into the casing and calcined.

The casing is preferably molded into a composition comprising 11 to 37 parts by weight of nickel and 0.20 to 0.70 parts by weight of carbon, based on 15 to 28 parts by weight of chromium.

Incinerator fire wall construction method using a heat-resistant steel block according to the present invention can be constructed as a conventional fire brick at the location of the fire brick adjacent to the grate side by the integrated heat resistant steel block by filling the castable as a refractory material in the inner space of the cube. The construction of the fireproof wall or the replacement of the existing firebrick can be performed very simply, and the heat resistant steel block of the present invention is easy to maintain and repair the incinerator fireproof wall because it is prevented from being damaged by heat deformation and clinker even at high temperatures in the incinerator. It works.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, a method for constructing a fireproof wall for an incinerator using a heat resistant steel block according to the present invention.

4 and 5 show a heat resistant steel block used in the fireproof wall construction method for the incinerator of the present invention. The heat resistant steel block according to the present invention is composed of a casing 100 having a hollow hexahedron shape formed of a heat resistant steel material and having an open rear side, and a castable 101 which is filled as a heat insulating material in the casing inner space and integrated.

The casing 100 has a plurality of holes 102 in the front surface exposed when assembled to the incinerator fire wall, in the embodiment shown in the figure are respectively formed in the four corners and the center of the thermal expansion during the high temperature incineration operation, The swelling of the center portion is prevented by the gas generated from the castable filled therein.

Alternatively, slits may be formed instead of holes in the front of the casing.

In addition, the casing 100 is preferably formed of a heat-resistant steel that can have sufficient durability even at an incinerator operating temperature of 1200 degrees or more, and a castable filled as a refractory in the casing is sufficient at an incinerator operating temperature of 1200 degrees or more. Insulation and fire resistance, hot volume stability and high strength in the entire temperature range should be used. To this end, the high alumina heat insulating castable according to the present invention is 62-85% by weight of aluminum oxide, 16-38% by weight of silicon dioxide, 1-2% by weight of calcium oxide, 0.0-1.5% by weight of iron oxide, magnesium oxide 0.0-1 It is preferably a composition in weight percent.

Table 1 below is a heat-resistant steel specimen (X1) consisting of 34 parts by weight of nickel, 0.4 parts by weight of carbon, 1.6 parts by weight of silicon, 1.4 parts by weight of manganese, 0.03 parts by weight of phosphorus, 0.02 parts by weight of sulfur, and 18 parts by weight of chromium. Standard tensile test results for the heat-resistant steel specimen (X2) consisting of 36 parts by weight of nickel, 0.5 parts by weight of carbon, 1.4 parts by weight of silicon, 1.5 parts by weight of manganese, 0.02 parts by weight of phosphorus, and 0.04 parts by weight of sulfur. It can be seen that the casing made of the heat resistant steel composition has good mechanical properties.

Table 1. Heat resistant steel composition test results

Items  Heat resistant steel composition X1 X2 Average  Elongation (%) 9 9.8 9.4 Tensile Strength (Kg / mm ² ) 58 56 57 Strength (Kg / mm ² ) 28 27 27.5 Chemical composition (%)
Chemical composition C 0.4 0.5 0.45 Si 1.6 1.4 1.5 Mn 1.4 1.5 1.45 P 0.03 0.02 0.025 S 0.02 0.04 0.03 Ni 34 36 35 Cr 18 17 17.5

Table 2 below is castable composition (Y1) consisting of 68% by weight of aluminum oxide, 20% by weight of silicon dioxide, 1.2% by weight of calcium oxide, 0.5% by weight of iron oxide, 0.3% by weight of magnesium oxide, 70% by weight of aluminum oxide, Linear change rate (%) after being maintained at 110 degrees for 24 hours for a castable composition (Y2) composed of 18% by weight of silicon, 1.4% by weight of calcium oxide, 0.4% by weight of iron oxide, and 0.2% by weight of magnesium oxide, 1000 degrees and 1350 degrees Permanent linear change after 3 hours at, and 24 hours at 110 degrees, 3 hours at 1000 degrees, and 3 hours at 135 degrees, respectively.

Table 2. Castable composition test results

Items Castable composition X1 X2 Average Linear rate of change (%)
Permanent Linear
Change 110 ℃ × 24hrs -0.05 -0.04 -0.045 1000 ℃ × 3hrs -0.19 -0.21 -0.20 1350 ℃ × 3hrs -0.4 -0.38 -0.39 Compression [curve] strength (Kg / ㎠)
Cold crushing
Strength
[Modulus of Rupture] 110 ℃ × 24hrs 88 86 87 1000 ℃ × 3hrs 70 76 73 1350 ℃ × 3hrs 140 138 139 Chemical composition (%)
Chemical composition Al ₂ O ₃ 68 70 69 SiO ₂ 20 18 19 CaO 1.2 1.4 1.3 FeO3 0.5 0.4 0.45 MaO 0.3 0.2 0.25

From Table 2 above, the castable used in the present invention can be seen that the volume change is very stable with respect to the operating conditions in the incinerator does not cause deformation of the casing, it provides sufficient strength.

In the method of constructing a fireproof wall for an incinerator according to the present invention, first, the powdery components are uniform in the hexahedral casing 100 in which the anchor 110 is welded to both sides of which the inside is empty and the back side is opened. The mixed castable composition was filled and calcined as shown in FIG. 6 to produce a heat resistant steel block in which the castable is integrated into the casing by the anchor.

Then, as described above, the heat-resistant steel block filled with the castable removes two layers of fire bricks adjacent to the grate from the fire wall of the incinerator, and the heat-resistant steel of the present invention at the removed fire brick position. The block is inserted into the fire wall so that its front face is flush with the surrounding fire wall, and the gap between the adjacent fire bricks is filled with the above-mentioned castable mortar and finished.

According to the present invention, holes 102 are formed in the front side of the casing, so that gas generated in the castable can be discharged during the operation of the incinerator, thereby preventing the deformation of the casing, and the casing and the castable are integrally formed by the anchor. It is maintained, and the refractory wall construction or repair work can be performed simply and efficiently by simply repairing and incineration of the heat resistant steel blocks in which the castable is filled in the heat resistant steel casing according to the present invention like a firebrick.

According to the present invention, a heat-resistant steel block filled with a fire-resistant castable in a heat-resistant steel casing and firmly held by an anchor is installed in place of fire-bricks adjacent to the grate in an incinerator wall like a conventional fire-brick. Compared with assembling on the wall, the construction is very simple, and there is no effect of deformation of the heat resistant steel block at the incinerator operating temperature, and the clinker is not firmly attached.

1 is a schematic internal configuration diagram of an incinerator.

Figure 2 is a schematic configuration diagram for explaining the movement of waste by the grate of Figure 1;

Figure 3 is a schematic exploded perspective view of a firebrick replacement liner for installing in a conventional fireproof wall.

4 is a schematic perspective view of a heat resistant steel block casing according to the present invention;

FIG. 5 is a perspective view seen from the back side of the heat resistant steel block casing of FIG. 4; FIG.

6 is a cross-sectional view showing a state in which a castable is filled in the heat resistant steel block casing of FIG. 4 and integrated by an anchor;

7 is a view showing the construction of the heat-resistant steel block of Figure 6 in the incinerator fire wall.

Claims (3)

In an incinerator fire wall construction method in which a heat resistant steel block is inserted at a location of a fire brick adjacent to a grate to prevent damage of a fire brick by attachment of a clinker generated in an incinerator, the front side of the incinerator fire wall is open and has an empty hexahedron shape. The front of the heat resistant steel block is disposed on the same plane as the fire wall at the location of the fire brick adjacent to the side of the grate, and the heat resistant steel block including the casing 100 having holes formed therein and the castable 101 filled with the fire resistant material in the inner space of the casing. Incinerator fire wall construction method characterized in that the filling and finishing the filling between the adjacent heat-resistant steel block and the refractory brick. The method according to claim 1, wherein the castable is 62-85% by weight of powdered aluminum oxide, 16-38% by weight of silicon dioxide, 1-2% by weight of calcium oxide, 0.0-1.5% by weight of iron oxide, 0.0-1% by weight of magnesium oxide An incinerator fireproof wall construction method, characterized in that the mixture is made of% and uniformly filled in the casing and calcined. 3. The incinerator fire wall construction method according to claim 2, wherein the casing is formed of a composition including 11-37 parts by weight of nickel and 0.20-0.70 parts by weight of carbon with respect to 15-28 parts by weight of chromium.

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