JPH07225016A - Sidewall structure of incinerator and refractory brick - Google Patents

Abstract

PURPOSE:To efficiently suppress temperature rises of a refractory brick and a matter to be incinerated without leakage of gas from a connected part of the bricks by laterally and longitudinally arranging a plurality of the bricks at a combustion chamber side of a high-temperature zone of a sidewall, and arranging a water-cooled tube at its rear side. CONSTITUTION:An incinerator A has an introducing hopper 5 for a matter 4 to be incinerated arranged at an upper side of a dry fire grate 1. An exhaust path 8 for exhausting incinerated ash 6 to a water sealing conveyor water tank 7 is arranged at an exhaust side of an afterburning fire grate 3. Further, a combustion chamber 10 enclosed by a sidewall 9 is arranged at an upper side of a burning fire grate 2 to communicate with an exhaust smoke opening 12 through a flue 11. In this case, a plurality of refractory bricks 14 are laterally and longitudinally arranged at the chamber 10 side of a high-temperature zone of the sidewall 9. A water cooling tube 15 for cooling is arranged at a rear side of the bricks 14. Thus, temperature rises of the bricks 14 and the matter 4 to be incinerated can be efficiently suppressed without leakage of gas from connected parts of the bricks 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side wall structure of an incinerator.

[0002]

2. Description of the Related Art Conventionally, an incinerator for incinerating incinerators such as municipal waste has a charging port for charging the incinerators into the furnace, and an incinerator in a combustion chamber surrounded by side walls. It has a grate for drying and burning, and transporting and discharging the ash after incineration to a predetermined place.

In recent years, a large amount of paper and plastics are contained in incinerated materials such as municipal waste, and these burn violently when incinerated. Therefore, in order to prevent the corrosion of the water-cooled pipe, the surface of the water-cooled pipe for heat recovery provided on the side wall of the incinerator is provided with castable on the combustion chamber side surface.

On the surface of the water cooling pipe on the combustion chamber side, for example, Si
A plurality of rectangular block-shaped refractory bricks made of C are stacked in layers, the corners of each refractory brick are joined together by fixtures such as mounting bolts, and an outer plate that serves as a furnace body is arranged on the outside to The space surrounded by the outer plate is an air-cooling chamber for cooling refractory bricks, and there is a technique for suppressing the rise in temperature of the refractory bricks by sending air to the air-cooling chamber by an air pipe (for example, Japanese Patent Publication No. Sho 60-9210). .

[0005]

In the above-mentioned conventional incinerator, in which the surface of the water cooling pipe on the combustion chamber side is castable, the volume of the castable shrinks when it is dried, so that the joints between the water cooling pipes are contracted. There is a gap,
The ash of the incinerated substance that has melted adheres to this, and this ash develops on the combustion chamber side and reduces the thermal conductivity of the water cooling pipe.

In the case of stacking rectangular block-shaped refractory bricks on the surface of the water-cooled pipe on the side of the combustion chamber, when the air for cooling the refractory bricks is sent to the air-cooling chamber during incineration of the material to be incinerated, it is stacked. Air leaks into the combustion chamber through the gaps between the refractory bricks, and some of the incineration objects in the combustion chamber near the side walls burn violently, which causes clinker to form on the furnace wall. Also, it may damage the grate.

As described above, especially in recent years, a large amount of plastics to be incinerated is contained in the municipal solid waste, and in this case, if air leaks into the combustion chamber, the plastics to be incinerated. Burns violently, clinker is generated, and the grate is significantly damaged.

Furthermore, since the refractory brick is cooled by sending air to the air-cooling chamber by an air supply pipe, which is a so-called air-cooling type, there is a problem that the refractory brick is not sufficiently cooled.

Therefore, the present invention has an object to provide a sidewall structure of an incinerator which can solve the above problems.

[0010]

Means for Solving the Problems The means for solving the problems in the present invention is to burn an object to be incinerated from an inlet while moving it on a grate arranged in a combustion chamber surrounded by a side wall. In an incinerator that discharges ash after combustion to a predetermined place, the high temperature zone portion of the side wall on the combustion chamber side is composed of a plurality of refractory bricks, and a water cooling pipe is attached to the side opposite to the combustion chamber of the refractory bricks. It is a thing.

Further, there is provided a refractory brick composed of a covering portion having an arcuate cross section along the outer peripheral surface of a plurality of water cooling pipes and a connecting portion for connecting the covering portions, wherein the water cooling pipe is attached to the connecting portion. A mounting hole into which a mounting tool for inserting is attached is formed, and a thickness of a peripheral portion of the mounting hole is thicker than that of the covering portion.

Further, a plurality of protrusions for holding a gap for filling the refractory mortar with the outer peripheral surface of the water cooling pipe is a refractory brick provided separately in the axial direction of the water cooling pipe, and the protrusions are It is arranged in an asymmetrical position around the mounting hole.

Further, a refractory mortar is filled between the outer peripheral surface of the water cooling pipe, which is composed of a covering portion having an arcuate cross section along the outer peripheral surface of the plurality of water cooling pipes and a connecting portion connecting the covering portions. A plurality of projections for holding the gap is a refractory brick provided separately in the pipe axial direction of the water cooling pipe,
A mounting hole into which a mounting tool for mounting the water cooling pipe is inserted is formed in the connecting portion, and the protrusion is arranged at an asymmetrical position with the mounting hole as a center.

[0014]

In the above structure, a water cooling pipe is arranged on the back surface of the refractory bricks arranged in the high temperature zone, and water is supplied to the water cooling pipe at the time of incineration of the incineration object, whereby the refractory bricks are surely cooled from the back surface.

Further, the water cooling pipe is brought into contact with the combustion chamber side of the water cooling pipe, the fitting provided on the water cooling pipe side is aligned and inserted into the mounting hole of the connecting portion, and is fastened by the fastener. Secure the refractory bricks to.

The coating part of the refractory brick is brought close to the combustion chamber side of the water cooling pipe, the projection is brought into contact with the surface of the water cooling pipe, the refractory mortar is filled in the water cooling pipe, and the fixture provided on the water cooling pipe side is connected to the connecting portion. The water cooling pipe and the refractory brick are fixed by aligning and inserting them into the mounting holes and fastening them with fasteners. At this time, if any of the protrusions is located at the joint of the water cooling pipe, the refractory brick is turned upside down and the refractory brick is attached to the water cooling pipe without the protrusion hitting the joint.

[0017]

Embodiments of the side wall structure and the refractory brick of the incinerator of the present invention will be described below with reference to the drawings. First, the side wall structure according to the first embodiment of the present invention will be described based on the overall side view of the incinerator A of FIG. 1, which includes a dry grate 1, a combustion grate 2, and a post-combustion grate 3 inside. Are provided in this order in a staircase manner, a hopper 5 for charging the incinerated material 4 is disposed above the dry grate 1, and ash 6 after incineration is disposed on the discharge side of the post-combustion grate 3 in a water-sealed conveyor water tank. A discharge path 8 for discharging to 7 is provided.

An upper side of the combustion grate 2 is a combustion chamber 10 surrounded by a side wall 9, and the combustion chamber 10 includes a flue 11
It communicates with the smoke exhaust port 12 via. Of the side wall 9, the portions corresponding to the end of the dry grate 1 on the side of the combustion grate 2, the side of the combustion grate 2 and the end of the post-combustion grate 3 on the side of the combustion grate 2 are high temperature zones. A plurality of SiC refractory bricks 14 are vertically and horizontally adjacent to each other on the side of the combustion chamber 10 of the side wall 9 in the high temperature zone.
A water cooling pipe 15 for refractory brick cooling is attached to the back side of 4 (the side opposite to the combustion chamber).

Bricks or castables 16 are also arranged in a portion not facing the high temperature zone, and the bricks or castables 16 are of the same quality as those conventionally used as side wall bricks.

In the above structure, since the water-cooling pipe 15 is arranged on the back surface of the refractory brick 14 arranged in the high temperature zone, the refractory brick 14 can be backed by supplying water to the water-cooling pipe 15 when incinerating the incineration object 4. Since it is a water-cooled type that cools the refractory bricks 14 by supplying water to the water-cooled pipes 15 instead of the air-cooled type as in the conventional case, air leaks from the joint portion of the refractory bricks as in the conventional case. Therefore, it is possible to prevent the combustion temperature of the incineration object 4 from rising more than necessary, thereby suppressing the generation of clinker on the furnace wall and preventing the combustion grate 2 from being damaged.

Next, a refractory brick 14 according to a second embodiment of the present invention will be described with reference to the perspective view of the refractory brick shown in FIG. 2, a horizontal sectional view of FIG. 3, a rear view of FIG. 4, and a vertical sectional view of FIG. 2 and FIG. 3, this is a refractory brick 14 provided in the high temperature zone portion of the side wall 9 of the incinerator A shown in the first embodiment, and one refractory brick 14 is A plurality of (two in the figure) water-cooled pipes 15 are covered along the outer peripheral surface on the combustion chamber 10 side and have a predetermined length and have an arcuate cross section.
1, 21 and a connecting portion 22 for connecting the covering portions 21, 21.

The water cooling pipes 15 are attached to each other by a mounting member 23 provided therebetween, and the mounting member 23
Is provided with a fitting 24 for mounting the connecting portion 22 and the mounting member 23 of the water cooling pipe 15 (for example, a stud bolt is welded), and the fitting 24 is provided at the center of the connecting portion 22 of the refractory brick 14. Is formed, and the thickness of the peripheral portion of the mounting hole 25 is made thicker than the covering portions 21 and 21.

The refractory brick 1 constructed in this way
4 are arranged on the combustion chamber 10 side of the side wall 9 of the incinerator A. In the above-mentioned structure, the coating portions 21 and 21 of the refractory bricks 14 are brought into contact with the combustion chamber 10 side of the water cooling pipe 15, and the fixture 24 is aligned with and inserted into the attachment hole 25. The refractory brick 14 is fixed to the water cooling pipe 15 by inserting and tightening (a nut is used).

By forming the thickness of the peripheral portion of the attachment hole 25 to be thicker than that of the covering portions 21 and 21, the fastening force of the fastener can be endured and cracking of the refractory brick 14 accompanying the fastening of the fastener can be prevented. .

Further, only the periphery of the mounting hole 25 is covered with the covering portion 2.
Since it is formed thicker than the Nos. 1 and 21, heat conduction to the water cooling pipe 15 is not reduced. FIG. 6 shows a refractory brick 14 as a comparative example. In order to reinforce the water-cooling pipe 15 when it is attached, the whole is formed in a rectangular parallelepiped shape, and the back side portion that abuts the water-cooling pipe 15 is formed in a wavy shape. However, in this refractory brick 14, the portion that does not need to be reinforced is also thick, so that a large amount of material is required during manufacture.

Next, the refractory brick 14 according to the third embodiment of the present invention will be described with reference to the horizontal sectional view of the state where it is attached to the water cooling pipe of FIG. 7, the side view of FIG. 8 and the front view of the single body of FIG. Then, this is the refractory brick 14 as in the second embodiment.
Is a coating portion 21, 21 having a predetermined height along the outer peripheral surface of the water cooling pipe 15 on the side of the combustion chamber 10 and a coupling for coupling the coating portions 21, 21 between the coating portions 21, 21. And a mounting hole 25 is formed in the center of the connecting portion 22, and the mounting member 2 of the water cooling pipe 15 is formed.
3, a mounting tool 24 for mounting the connecting portion 22 and the mounting member 23 of the water cooling pipe 15 is provided.

A refractory mortar 30 is formed between the center of the back surface of each of the coating portions 21 and 21 and the outer peripheral surface of the water cooling pipe 15.
Pair of protrusions 32, 33 for holding a gap for filling
Are formed so as to be separated from each other in the axial direction (vertical direction) of the water cooling pipe 15, and the protrusions 32 and 33 are arranged at asymmetrical positions with the mounting hole 25 as the center.

For example, one of the protrusions 32 has a mounting hole 25.
To L1 = 80 mm, and the other protrusion 33 is provided at a position L2 = 60 mm from the mounting hole 25. As shown in FIG. 8, the water cooling pipe 15 has a joining portion joined by welding 34 at a predetermined position.

In the above structure, the projections 32 and 33 formed on the coating portions 21 and 21 of the refractory brick 14 are brought into contact with the surface of the water cooling pipe 15 from the side of the combustion chamber 10 of the water cooling pipe 15, and the refractory mortar 30 is connected to the water cooling pipe 15. And the fitting 24 is aligned with the fitting hole 25 of the connecting portion 22 and inserted, and the fitting is fastened to fix the refractory brick 14 to the water cooling pipe 15.

By the way, when the refractory brick 14 is attached to the water cooling pipe 15, if any of the protrusions 32 and 33 is located at the joint portion of the water cooling pipe 15, the refractory brick 14 is mounted upside down. Then, the protrusions 32, 33
Is formed in an asymmetrical position around the mounting hole 25, so that if one protrusion 32 is located at the joint portion 14 of the water cooling pipe 15, by flipping the refractory brick 14 upside down, the other protrusion 33 Can avoid the joint, and the projections 32 and 33 do not hit the joint 14 and the refractory brick 1
4 can be attached to the water cooling pipe 15.

The present invention is not limited to the above embodiment, and the refractory brick 14 used in the high temperature zone portion of the incinerator A described in the first embodiment is shown in the second embodiment or the third embodiment. It can also be a refractory brick 14.

Further, in the second embodiment, the number of the coating portions 21 and 21 of the refractory brick 14 is two, but the number is not limited to this, and as shown in FIGS. 10 and 11, three coating portions 21 are provided. Also, even if the periphery of the mounting hole 25 formed in each connecting portion 22 between the covering portions 21 is formed to be thicker than the covering portions 21 and 21, the same effect as the second embodiment is obtained. Can play.

In the third embodiment, the protrusion 32,
33 is arranged at the center of the back surface of the covering portions 21 and 21, but is not limited to this, and is displaced from the center by a predetermined angle θ (for example, in the range of 45 °) toward the connecting portion 22 side in the circumferential direction of the arc. You may make it arrange | position in a position.

Further, the protrusion 3 as shown in the third embodiment.
2, 33 may be provided for the refractory brick 14 having a thick wall around the mounting hole 25 shown in the second embodiment,
In this case, the mounting hole 25 can be reinforced, and the refractory bricks 14 can be attached to the connecting portion 22 without the projections 32 and 33 hitting the joint portion of the connecting portion 22 during the attachment.

[0035]

EFFECTS OF THE INVENTION As is clear from the above description, according to the present invention, a refractory brick is provided in the high temperature zone of the side wall of the incinerator, and the water cooling pipe is attached to the side opposite to the combustion chamber of the refractory brick. The refractory bricks can be reliably cooled when incinerating the incinerator, and there is no air leak between the refractory bricks into the combustion chamber that occurs in the case of the conventional air-cooled type, so the combustion temperature of the incineration object is abnormally high. It is possible to prevent the formation of clinker and prevent burnout of the grate.

Further, the refractory brick is composed of a covering portion for covering the water cooling pipe and a connecting portion for connecting the covering portions,
Since the periphery of the mounting hole formed in this connecting part is reinforced by forming it thicker than the covering part, the covering part having a predetermined thickness can maintain the necessary thermal conductivity and the refractory brick can be connected to the connecting part. When it is attached to, it is possible to withstand the fastening force of the fixture and prevent the fireproof brick from being broken by the fastening force of the fixture.

Further, since a plurality of protrusions for holding a gap for filling the refractory mortar with the outer peripheral surface of the water cooling pipe are arranged at asymmetrical positions around the mounting hole, one of the protrusions is a joint portion of the water cooling pipe. If it is located on the other side, by flipping the refractory brick upside down, the other protrusion avoids its joint,
Refractory bricks can be attached to water-cooled tubes without bumps hitting the joints.

[Brief description of drawings]

FIG. 1 is an overall side view of an incinerator showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a single unit of refractory brick showing a second embodiment of the present invention.

FIG. 3 is a horizontal sectional view of the same.

FIG. 4 is a rear view of the same.

FIG. 5 is a vertical sectional view of the same.

FIG. 6 is a perspective view showing a used state of a refractory brick showing a comparative example.

FIG. 7 is a cross-sectional view showing a usage state of a refractory brick showing a third embodiment of the present invention.

FIG. 8 is a vertical sectional view of the same.

FIG. 9 is a front view of a single fireproof brick.

FIG. 10 is a perspective view of a single unit of refractory brick showing another embodiment.

FIG. 11 is a horizontal sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dry grate 2 Combustion grate 3 Post-combustion grate 4 Incinerator 9 Side wall 10 Combustion chamber 14 Refractory brick 15 Water cooling pipe 21 Covering part 22 Connecting part 23 Mounting member 24 Mounting tool 25 Mounting hole 30 Refractory mortar 32 Projection 33 Projection

Claims (5)

[Claims] 1. An incinerator that burns while moving an incineration object that has been injected from an injection port while moving on a grate disposed in a combustion chamber surrounded by a side wall, and discharging the ash after combustion to a predetermined place, A side wall structure of an incinerator, wherein a high temperature zone portion on the side of the combustion chamber of the side wall is composed of a plurality of refractory bricks, and a water cooling pipe is attached to the side of the refractory brick opposite to the combustion chamber. 2. A refractory brick composed of a coating portion having an arcuate cross-section along the outer peripheral surface of a plurality of water cooling pipes and a connecting portion connecting the coating portions, wherein the water cooling pipe is provided at the connecting portion. A refractory brick characterized in that a mounting hole into which a mounting tool for mounting is inserted is formed, and a thickness of a peripheral portion of the mounting hole is thicker than that of the covering portion. 3. A refractory brick provided with a plurality of protrusions for holding a gap filled with refractory mortar between the water-cooled pipe and an outer peripheral surface of the water-cooled pipe, the protrusions being spaced apart from each other in the axial direction of the water-cooled pipe. The refractory brick according to claim 2, wherein the refractory brick is arranged in an asymmetrical position around the mounting hole. 4. A refractory mortar is filled between the outer peripheral surface of the water cooling pipe, which is composed of a covering portion having an arcuate cross section along the outer peripheral surface of the plurality of water cooling pipes and a connecting portion connecting the covering portions. Is a refractory brick provided with a plurality of projections for holding the gap to be spaced apart in the pipe axial direction of the water cooling pipe, the connecting portion has a mounting hole into which a mounting tool for mounting the water cooling pipe is inserted. A refractory brick formed, wherein the protrusions are arranged in an asymmetrical position around a mounting hole. 5. The side wall structure for an incinerator according to claim 1, comprising the refractory brick according to any one of claims 2 to 4.