CN216644232U - Anchoring structure for furnace wall of secondary combustion chamber for burning hazardous wastes - Google Patents

Abstract

The utility model discloses a furnace wall anchoring structure of a hazardous waste incineration secondary combustion chamber, which comprises an annular anchoring base, a working layer casting material, a heat insulation layer, heat-resistant anchoring nails and anchoring bricks. The anchoring brick is used for replacing a part of the anchoring nail, the stress area of the anchoring brick is large, the anchoring brick is used at the temperature of 1300-; the anchoring structure of the inner wall of the cylindrical pipeline of the secondary combustion chamber divides the annular direction of the pipeline into a plurality of transverse areas, divides the vertical direction of the pipeline into a plurality of longitudinal areas, and the transverse and longitudinal areas are distributed in an interlaced manner to form a stable latticed structure for the cylindrical pipeline, so that the castable and the heat-insulating layer are divided, the gravity overstocking effect is dispersed, and the collapse phenomenon caused by the gravity effect is avoided; local maintenance is damaged locally in the transverse area, so that the effects of quick and efficient maintenance are achieved.

Description

Furnace wall anchoring structure of hazardous waste incineration secondary combustion chamber

Technical Field

The utility model belongs to the technical field of a furnace wall structure of a hazardous waste incinerator, and particularly relates to a furnace wall anchoring structure of a secondary combustion chamber for hazardous waste incineration.

Background

The dangerous waste incinerator generally adopts a rotary kiln and a secondary combustion chamber incineration process with stable operation; firstly burning the dangerous waste in a rotary kiln, and removing toxic gases such as incompletely burnt waste pyrolysis gas and dioxin generated in the burning process after secondary combustion in a secondary combustion chamber; the second combustion chamber is usually composed of a lower square pipeline, a middle cylindrical pipeline and an upper large elbow pipeline; the lining of the furnace wall of the second combustion chamber is generally built by adopting two modes of refractory bricks and castable; by adopting a refractory brick masonry mode, because the joint of the lower square pipeline and the middle cylindrical pipeline is a hemispherical structure, the masonry brick cutting amount is large, the brick joints are more, high-temperature toxic smoke can transfer heat to the outer steel shell along the brick joints, and the steel shell is corroded and easily damaged; meanwhile, the middle cylindrical pipeline is as high as about 14.5 meters, and the problem of gravity overstock of the refractory bricks exists, so that supporting and rotating plates are required to be arranged at intervals, the brick supporting plates are welded on a stainless steel shell, the heat in the furnace is easily transferred from the positions of the brick supporting plates to cause deformation of the steel shell, and the steel shell overtemperature runs for a long time to cause damage of the brick supporting plates and falling of the internal refractory bricks; the problems caused by refractory bricks can be better solved by adopting a pouring material masonry mode, the furnace wall of the secondary combustion chamber is formed by combining a working layer pouring material, a heat insulation layer pouring material and a heat insulation plate into an integral lining, a certain number of heat-resistant anchoring nails are uniformly distributed in the lining, and the anchoring nails are welded with the steel shell to firmly support the pouring material and the steel shell together. However, the heat-resistant anchoring nail can bear the temperature of more than 1000 to 1200 ℃, the environment temperature of a secondary combustion chamber is 1100 to 1300 ℃, the local highest temperature can reach 1350 ℃, the environment temperature in the secondary combustion chamber exceeds the normal use temperature of the anchoring nail, the anchoring nail is easy to soften and deform, the anchoring nail is easy to break even after long-term over-temperature use, and the casting material is locally peeled off due to the fracture of the anchoring nail. The castable on the vertical height of the inner lining of the cylindrical furnace wall bears the gravity action of a castable layer with the height of 14.5 meters from the upper part due to the gravity action of the castable on the square pipeline at the lower part, the static pressure can reach 0.5 MPa (the pressure is increased by times in a hot state), the castable is also a key part for supporting the inner lining of the upper cylindrical furnace wall, if the anchoring nail at the part is broken, the castable at the part is peeled off, the castable at the upper part descends, and finally the integral inner lining of the furnace wall collapses downwards until the castable is damaged.

Disclosure of Invention

The utility model aims to solve the problems of softening, deformation and fracture of an anchoring nail of a lining of a secondary combustion chamber furnace wall and gravity overstock and collapse of castable, and provides an anchoring structure of a secondary combustion chamber furnace wall for burning hazardous wastes.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a dangerous waste incineration secondary combustion chamber furnace wall anchoring structure is characterized in that a secondary combustion chamber is composed of a lower square pipeline, a middle cylindrical pipeline and an upper large elbow pipeline; the second combustion chamber furnace wall is anchored with an annular anchoring base; the annular anchoring base is fixed on the inner wall surface of the middle cylindrical pipeline; the annular anchoring bases are arranged along the height of the inner wall of the second combustion chamber cylinder at intervals; the annular anchoring base consists of a plurality of anchoring bricks, heat-resistant anchoring nails, a heat-insulating layer, a working layer and a heat-insulating layer; the anchoring bricks in the upper and lower adjacent annular anchoring bases are arranged in a staggered manner in the vertical direction; the anchoring bricks and the heat-resistant anchoring nails are distributed in a staggered manner at intervals; the anchoring bricks and the heat-resistant anchoring nails which are arranged in a staggered manner divide the annular direction of the pipeline into a plurality of transverse areas, divide the vertical direction of the pipeline into a plurality of longitudinal areas, and form a stable grid-shaped structure for the cylindrical pipeline by the interweaving distribution of the transverse areas and the longitudinal areas; each anchoring brick is welded with the steel shell through an anchoring brick jacket, and the heat-resistant anchoring nail is directly welded on the steel shell; a heat insulation layer, a pouring heat insulation layer and a working layer are respectively built among the anchoring bricks, the heat-resistant anchoring nails and the steel shell from outside to inside; the front end part of the anchoring brick is flush with the outer end face of the working layer, and the distance between the front end part of the heat-resistant anchoring nail and the outer end face of the working layer is 30 mm; the anchoring brick and the heat-resistant anchoring nail firmly connect the heat-insulating layer, the working layer, the heat-insulating layer and the steel shell into a whole along one circle of the inner wall of the cylinder of the secondary combustion chamber to form an annular anchoring base.

The connecting part of the lower square pipeline and the cylindrical pipeline is of an inclined plane structure, and a circle of anchoring bricks are built along the radial direction of the inclined plane.

The angle of the inclined plane at the connecting part of the lower square pipeline and the cylinder pipeline is 120-140 degrees.

The circumferential distance between every two adjacent anchoring bricks on the annular anchoring base is 300-400mm, and the quantity of the heat-resistant anchoring nails distributed between every two adjacent anchoring bricks is different.

An expansion joint is arranged between the working layers of the upper and lower adjacent annular anchoring bases, the expansion joint is a zigzag joint, an independent longitudinal area is formed in the vertical direction, an expansion and contraction space is reserved for the casting material of the working layers, and damage to the casting material caused by thermal shock is avoided.

The utility model provides a hazardous waste incineration secondary combustion chamber furnace wall anchoring structure, which has the following beneficial effects:

(1) the anchoring bricks are used for replacing part of the anchoring nails, the stress area of the anchoring bricks is large, the anchoring bricks are used at the temperature of 1300-1350 ℃, the high-temperature effect of the anchoring bricks is good, the anchoring bricks cannot deform or break due to high temperature, and the problem that the heat-resistant anchoring nails deform or even break at the high temperature is solved, so that the pouring material is prevented from falling down due to gravity; the anchoring bricks are used for replacing refractory brick supporting plates to support the castable, so that the refractory brick has a high-temperature resistant effect and solves the problem of deformation of the steel shell;

(2) in the vertical direction of the cylinder, an annular anchoring base is fixed every 3.5 meters or so, about 3-4 annular anchoring bases are fixed, a plurality of independent longitudinal areas are formed between an upper base and a lower base in the vertical direction, each annular anchoring base has the function of bearing pull-up and pull-down, and the pouring material in the upper longitudinal area is dragged upwards in the vertical direction of the cylinder pipeline to play a role of supporting; the pouring material in the lower longitudinal area is pulled downwards to play a role of pulling, the upper pouring material, the lower pouring material and the annular anchoring base are firmly combined into a whole, the mutual supporting and fixing effects are achieved, the gravity overstock effect is well dispersed, and the pouring material is prevented from falling due to gravity;

(3) a transverse area is formed between two adjacent anchoring bricks in each annular anchoring base, the annular anchoring base is divided into a plurality of transverse areas by taking the anchoring bricks as boundaries, heat-resistant anchoring nails, castable and heat-insulating layers are distributed in the plurality of transverse areas, if the heat-resistant anchoring nails are broken or the castable is peeled off in a certain transverse area, the anchoring bricks at two ends of each transverse area have a supporting function, so that large-area peeling damage cannot be caused, the normal work of other transverse areas cannot be influenced, a cylindrical lining can be well protected, and on the other hand, local maintenance can be performed by local damage in the transverse areas, so that the effects of rapid and efficient maintenance are achieved;

(4) the anchoring structure of the inner wall of the cylindrical pipeline of the secondary combustion chamber divides the annular direction of the pipeline into a plurality of transverse areas, divides the vertical direction of the pipeline into a plurality of longitudinal areas, and the transverse and longitudinal areas are distributed in an interweaving way to form a stable grid structure for the cylindrical pipeline, so that the castable and the heat-insulating layer are divided, the overstocking effect of gravity is dispersed, and the collapse phenomenon caused by the gravity action is avoided;

(5) the anchoring brick on the inclined plane of the large corner structure at the joint of the hemispherical position of the lower square pipeline and the upper cylinder bears the gravity of the lining of the upper cylinder pipeline and can be decomposed into a downward pulling force parallel to the inclined plane and a downward pressure perpendicular to the inclined plane, the pulling stress and the compressive stress simultaneously act on the anchoring brick, and the anchoring brick is pulled and influenced by the pressure for a long time and can deform or even break; the latticed structure formed by the anchoring bricks is stable, the action of compressive stress and tensile stress on the anchoring bricks on the inclined plane is well relieved, the breakage of the anchoring bricks at the square-to-round part is avoided, and the collapse of the part is avoided.

Drawings

FIG. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of a portion I of FIG. 1;

FIG. 3 is a schematic structural view of an annular anchoring base;

FIG. 4 is a schematic view of a net structure of anchoring bricks;

fig. 5 is a schematic structural view of a connection portion of a lower square pipe and a middle cylindrical pipe.

In the figure: 1. anchoring the bricks; 2. anchoring nails; 3. a working layer; 4. a heat-insulating layer; 5. a thermal insulation layer; 6. a steel shell; 7. and (5) expanding the gap.

Detailed Description

Example 1:

as shown in fig. 1 and 2, a hazardous waste incineration secondary combustion chamber furnace wall anchoring structure, wherein a secondary combustion chamber is composed of a lower square pipeline, a middle cylindrical pipeline and an upper large elbow pipeline; the second combustion chamber furnace wall is anchored with an annular anchoring base; as shown in fig. 3 and 4, the annular anchoring base is fixed on the inner wall surface of the middle cylindrical pipeline; the annular anchoring base is composed of 25 anchoring bricks 1, 25 anchoring nails 2, a heat-insulating layer 4, a working layer 3 and a heat-insulating layer 5; the circumferential spacing distance between two adjacent anchoring bricks is 300 mm; the front end part of the anchoring brick is flush with the outer end face of the chrome corundum wear-resistant castable, the distance between the front end part of the heat-resistant anchoring nail and the outer end face of the chrome corundum wear-resistant castable is about 20mm, the anchoring brick 1 and the anchoring nail 2 are distributed at intervals in a staggered mode, the interval distance is 150mm, the anchoring brick 1 is welded with a steel shell through an anchoring brick jacket, the heat-resistant anchoring nail is directly welded on the steel shell, and a heat insulation layer 5, a pouring working layer and a pouring heat insulation layer are respectively built among the anchoring brick, the heat-resistant anchoring nail and the steel shell from outside to inside; the castable, the heat insulation layer and the steel shell are firmly connected into a whole along the circle of the inner wall of the cylinder of the secondary combustion chamber through the anchoring bricks and the heat-resistant anchoring nails to form an annular anchoring base.

According to the method, fixing annular anchoring bases on the inner wall of a cylinder of a secondary combustion chamber every 250 cm along the height direction, and fixing about 3-4 annular anchoring bases, wherein the anchoring bricks in each base and the anchoring bricks in the upper and lower adjacent bases are arranged in a staggered manner in the vertical direction;

a heat insulation layer 5, a pouring working layer and a pouring heat insulation layer are built between the upper annular anchoring base and the lower annular anchoring base, and heat-resistant anchoring nails are distributed in a staggered manner; an expansion joint 7 is arranged between the working layers built between the upper base and the lower base, the expansion joint 7 is a zigzag joint, an independent longitudinal area is formed in the vertical direction, an expansion and contraction space is reserved for the casting material of the working layers, and damage to the casting material caused by thermal shock is avoided.

Example 2: the main structure of the embodiment is the same as that of embodiment 1, and in the embodiment, the annular anchoring base is composed of 20 anchoring bricks, 20 heat-resistant anchoring nails, an insulating layer 4, a working layer 3 and a heat insulation layer 5. The anchoring bricks and the heat-resistant anchoring nails are distributed in a staggered mode at intervals, and the interval distance is 200 mm.

Example 3: the main structure of the embodiment is the same as that of embodiment 1, in the embodiment, as shown in fig. 5, the connection part of the lower square pipeline and the cylindrical pipeline is a slope structure, and a circle of anchoring bricks are built along the radial direction of the slope; in the embodiment, the connecting part of the lower square pipeline and the cylindrical pipeline is an inclined plane with an angle of 135 degrees.

Claims (5)

1. The utility model provides a hazardous waste burns two combustion chamber furnace wall anchor structure which characterized in that: the second combustion chamber consists of a lower square pipeline, a middle cylindrical pipeline and an upper large elbow pipeline; the second combustion chamber furnace wall is anchored with an annular anchoring base; the annular anchoring base is fixed on the inner wall surface of the middle cylindrical pipeline; the annular anchoring bases are arranged along the height of the inner wall of the second combustion chamber cylinder at intervals; the annular anchoring base consists of a plurality of anchoring bricks, heat-resistant anchoring nails, a heat-insulating layer, a working layer and a heat-insulating layer; the anchoring bricks in the upper and lower adjacent annular anchoring bases are arranged in a staggered manner in the vertical direction; the anchoring bricks and the heat-resistant anchoring nails are distributed in a staggered manner at intervals; the anchoring bricks and the heat-resistant anchoring nails which are arranged in a staggered manner divide the annular direction of the pipeline into a plurality of transverse areas, divide the vertical direction of the pipeline into a plurality of longitudinal areas, and the transverse areas and the longitudinal areas are distributed in an interwoven manner to form a stable grid-shaped structure for the cylindrical pipeline; each anchoring brick is welded with the steel shell through an anchoring brick jacket, and the heat-resistant anchoring nail is directly welded on the steel shell; a heat insulation layer, a pouring heat insulation layer and a working layer are respectively built among the anchoring bricks, the heat-resistant anchoring nails and the steel shell from outside to inside; the front end part of the anchoring brick is flush with the outer end face of the working layer, and the distance between the front end part of the heat-resistant anchoring nail and the outer end face of the working layer is 30 mm; the anchoring brick and the heat-resistant anchoring nail firmly connect the heat-insulating layer, the working layer, the heat-insulating layer and the steel shell into a whole along one circle of the inner wall of the cylinder of the secondary combustion chamber to form an annular anchoring base.

2. A hazardous waste incineration secondary combustion chamber furnace wall anchoring structure according to claim 1, wherein: the connecting part of the lower square pipeline and the cylindrical pipeline is of an inclined plane structure, and a circle of anchoring bricks are built along the radial direction of the inclined plane.

3. A hazardous waste incineration secondary combustion chamber furnace wall anchoring structure according to claim 2, wherein: the angle of the inclined plane at the connecting part of the lower square pipeline and the cylinder pipeline is 135 degrees.

4. A hazardous waste incineration secondary combustion chamber furnace wall anchoring structure according to claim 1, wherein: the circumferential distance between every two adjacent anchoring bricks on the annular anchoring base is 300-400mm, and the quantity of the heat-resistant anchoring nails distributed between every two adjacent anchoring bricks is different.

5. A hazardous waste incineration secondary combustion chamber furnace wall anchoring structure according to claim 1, wherein: and expansion joints are arranged between the working layers of the upper and lower adjacent annular anchoring bases and are zigzag joints.

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