CN219037604U - Furnace cover composite lining and kiln - Google Patents

Abstract

The utility model discloses a furnace cover composite lining and a furnace, wherein the furnace cover composite lining comprises a heat insulation layer, a fiber layer and a fiber module, the heat insulation layer is paved on the inner wall of the furnace cover, the fiber layer is paved on one side of the heat insulation layer far away from the furnace cover, and the fiber module is paved on one side of the fiber layer far away from the furnace cover, wherein the heat conductivity coefficient of the heat insulation layer is smaller than that of the fiber layer and the fiber module. The fiber module and the fiber layer have better sealing performance and high temperature resistance, and the heat conductivity coefficient is smaller than that of the traditional casting material, so that heat dissipation can be reduced; the heat conductivity of the heat insulation layer is smaller than that of the fiber layer and the fiber module, and heat conduction can be well blocked. Therefore, the furnace cover composite lining has good heat insulation effect, can reduce heat loss and prolongs the service life of the furnace cover.

Description

Furnace cover composite lining and kiln

Technical Field

The utility model relates to the technical field of kilns, in particular to a furnace cover composite lining.

The utility model also relates to a kiln.

Background

Through market research, kiln covers of some high-temperature industries mainly use well kilns with the temperature of about 1200-1500 ℃, such as graphitized anode materials. The existing kiln cover uses pouring materials and heavy materials anchored by refractory bricks as lining structures, and the pouring materials have large heat accumulation and large heat conduction, so that the temperature of the outer wall of the kiln cover is high, the energy and the heat cannot be effectively saved, the heat loss is quite high, and a certain economic burden is caused to a user; and the service life of the furnace cover lining is short, the service life is generally about 12 months, then the castable can fall off for a plurality of reasons, and the refractory layer falls off and cracks due to incapability of attaching after the anchoring bricks are broken, so that the castable is lost in the furnace material.

Therefore, how to optimize the furnace cover lining, prolong the service life of the furnace cover, solve the problems of energy saving, consumption reduction and the like, and become the urgent problem to be solved by the furnace cover users of the current kiln.

Disclosure of Invention

The utility model aims to provide a furnace cover composite lining which has good heat insulation effect, can reduce heat loss and prolongs the service life of a furnace cover. The utility model also provides a kiln.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides a compound lining of bell, includes insulating layer, fibrous layer and fibre module, the insulating layer lays in the inner wall of bell, the fibrous layer lay in the insulating layer is kept away from one side of bell, the fibre module lay in the fibrous layer is kept away from one side of bell, the thermal conductivity of insulating layer is less than the fibrous layer and the thermal conductivity of fibre module.

Optionally, the furnace cover further comprises an anchor fixedly connected with the furnace cover, the anchor penetrates through the heat insulation layer and the fiber layer, and the fiber module is fixedly connected with the anchor.

Optionally, the furnace cover also comprises a fire-resistant protective layer covering one side of the fiber module, which is far away from the furnace cover.

Optionally, a cavity is formed in the fiber module, the cavity is communicated with one side, far away from the furnace cover, of the fiber module, and a fire-resistant protection material is filled in the cavity and is connected with the fire-resistant protection layer.

Optionally, the depth direction of the cavity is inclined with respect to the thickness direction of the fiber module.

Optionally, the depth direction of the cavity is inclined at an angle of 10 ° to 25 ° with respect to the thickness direction of the fiber module.

Optionally, the hollow is long.

Optionally, at least two cavities are arranged on the fiber module, and the cavities are not communicated with each other.

Optionally, the depth direction of the cavity is inclined relative to the thickness direction of the fiber module, and the inclination angle of the depth direction of each cavity relative to the thickness direction of the fiber module is consistent.

The kiln comprises a kiln cover and a lining arranged on the kiln cover, wherein the lining comprises the composite lining for the kiln cover.

According to the technical scheme, the furnace cover composite lining comprises the heat insulation layer, the fiber layer and the fiber module, wherein the heat insulation layer is paved on the inner wall of the furnace cover, the fiber layer is paved on one side of the heat insulation layer far away from the furnace cover, and the fiber module is paved on one side of the fiber layer far away from the furnace cover, and the heat conductivity coefficient of the heat insulation layer is smaller than that of the fiber layer and the fiber module. The fiber module and the fiber layer have better sealing performance and high temperature resistance, and the heat conductivity coefficient is smaller than that of the traditional casting material, so that heat dissipation can be reduced; the heat conductivity of the heat insulation layer is smaller than that of the fiber layer and the fiber module, and heat conduction can be well blocked. Therefore, the furnace cover composite lining has good heat insulation effect, can reduce heat loss and prolongs the service life of the furnace cover.

The kiln provided by the utility model can achieve the beneficial effects.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a composite lining for a furnace cover according to an embodiment of the present utility model.

Reference numerals in the drawings of the specification include:

1-anchoring piece, 2-heat insulation layer, 3-fiber layer, 4-fiber module, 5-fire-resistant protective material, 6-fire-resistant protective layer and 7-furnace cover.

Detailed Description

In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

The embodiment provides a compound lining of bell, including insulating layer, fibrous layer and fibre module, the insulating layer lays in the inner wall of bell, the fibrous layer lay in the insulating layer is kept away from one side of bell, the fibre module lay in the fibrous layer is kept away from one side of bell, the thermal conductivity of insulating layer is less than the fibrous layer with the thermal conductivity of fibre module.

The fiber module is a block structure formed of fibers, i.e., a block structure formed of continuous or discontinuous filaments. The fibrous layer is a layered structure formed of fibers, i.e. a layered structure formed of continuous or discontinuous filaments. Inorganic fibers are adopted, the fiber layers and the fiber modules have good sealing performance and high temperature resistance, and the heat conductivity is smaller than that of the traditional casting material, so that heat dissipation can be reduced. The heat conductivity of the heat insulation layer is smaller than that of the fiber layer and the fiber module, and heat conduction can be well blocked. Therefore, the furnace cover composite lining of the embodiment has good heat insulation effect, can reduce heat loss and prolongs the service life of the furnace cover.

Referring to fig. 1 for example, fig. 1 is a schematic diagram of a composite lining of a furnace cover according to an embodiment, as shown in the drawing, the composite lining of a furnace cover includes a heat insulation layer 2, a fiber layer 3 and a fiber module 4, the heat insulation layer 2 is laid on an inner wall of the furnace cover 7, the fiber layer 3 is laid on a side of the heat insulation layer 2 far away from the furnace cover 7, and the fiber module 4 is laid on a side of the fiber layer 3 far away from the furnace cover 7.

The heat insulation layer 2 is made of an ultralow heat conduction material with small heat conduction coefficient, so that a good heat insulation effect is achieved. The insulating layer 2 does not comprise common, standard, high purity, high aluminum, zirconium-containing, chromium-containing fiber modules or components and the like which have high thermal conductivity coefficients during the long-term use of the kiln. The insulating layer 2 may be an insulating board, and the insulating layer 2 may be, but is not limited to, an ultra-low thermal conductive board made of ultra-low thermal conductive material.

The fibrous layer 3 may be, but is not limited to, a fibrous blanket or a fibrous cotton, and the fibrous blanket may be, but is not limited to, a zirconium-containing fibrous blanket, an alumina fibrous blanket or a ceramic fibrous blanket. The fiber layer 3 may include, but is not limited to, a fiber blanket or a fiber cotton using the same material as the fiber module 4, or the fiber layer 3 may include, but is not limited to, a fiber blanket or a fiber cotton using a higher temperature level than the fiber module 4.

The fibre modules 4 may be laid in an array on the side of the fibre layer 2 remote from the furnace cover 7, the individual fibre modules 4 being spliced to one another. In this embodiment, the shape, size and number of the fiber modules 4 are not limited, as long as a plurality of fiber modules 4 can be spliced with each other to form a heat insulation layer, and in practical application, the fiber modules can be set according to the shape and size of the furnace cover 7. Alternatively, the fiber module 4 may be a rectangular parallelepiped or square shape or the like that is convenient for splicing. The fiber module 4 may be, but is not limited to, a ceramic fiber module or a crystalline alumina fiber module.

Further, the furnace cover composite lining can further comprise an anchor fixedly connected with the furnace cover 7, the anchor penetrates through the heat insulation layer 2 and the fiber layer 3, and the fiber module 4 is fixedly connected with the anchor. Referring to fig. 1, one end of an anchor 1 is fixedly connected with a furnace cover 7, the other end passes through the heat insulation layer 2 and the fiber layer 3 and is connected with the fiber module 4, and the heat insulation layer 2, the fiber layer 3 and the fiber module 4 are fixedly connected through the anchor 1. For example, the furnace cover 7 is a steel plate, and the anchoring member 1 may be welded to the steel plate of the furnace cover 7. The anchor 1 may be an anchor pin.

Preferably in some embodiments, the furnace lid composite lining further comprises a refractory protection layer covering the side of the fibre module 4 remote from the furnace lid 7. As shown in fig. 1, a fire-resistant protection layer 6 is arranged on the hot surface of the fiber module 4, the fire-resistant protection layer 6 has the functions of high temperature resistance, cracking resistance and thermal shock resistance, and the fire-resistant protection layer 6 can be formed by thermal protection paint. The selectable thermal protection coating can be slurry-shaped coating material which takes fiber and refractory filler as main components, and has the characteristics of high temperature resistance, cracking resistance, thermal shock resistance, mechanical spraying, manual coating and high strength after drying. The fire-resistant protective layer 6 is used at a higher temperature level than or equal to the temperature level of the fiber layer 3 and the fiber module 4, and can be used as a mixture of one or more temperature levels of fiber thermal protective coating. In the present embodiment, the thickness of the refractory protection layer 6 is not limited, and may be set according to circumstances in practical applications.

Further preferably, a hollow is provided on the fiber module 4, the hollow is communicated with a side of the fiber module 4 away from the furnace cover 7, and a fire-resistant protection material is filled in the hollow, and is connected with the fire-resistant protection layer 6. As shown in fig. 1, a cavity is formed in the fiber module 4, a fire-resistant protection material 5 is filled in the cavity, and the fire-resistant protection material 5 is higher than the hot surface of the fiber module 4 and is connected with a fire-resistant protection layer 6 covering the hot surface of the fiber module 4. The fire-resistant protection material 5 is injected into the cavity of the fiber module 4, the fire-resistant protection material 5 has a fixing effect on the fire-resistant protection layer 6 of the hot surface of the fiber module 4 after solidification, plays a role of an anchoring piece to lock the fire-resistant coating of the hot surface of the fiber module 4, has smaller heat conductivity coefficient of the fire-resistant protection material 5, has no high heat conductivity coefficient like the conventional anchoring piece, and can reduce heat loss. The fire-resistant protective material 5 may be formed using the same heat-resistant protective coating as the fire-resistant protective layer 6.

Preferably, the hollow on the fiber module 4 is in a long shape, as shown in fig. 1, so that the fire-resistant protection material 5 is injected into the hollow, and the fire-resistant protection material 5 is firmly fixed on the fire-resistant protection layer 6 on the surface of the fiber module 4 after solidification, just like an anchor nail. Optionally, the vertical distance from the bottom of the cavity to the surface of the fiber module 4 is equal to or greater than one half the thickness of the fiber module 4. Preferably, the depth direction of the cavity is inclined with respect to the thickness direction of the fiber module 4 to prevent the refractory protection material 5 injected into the cavity of the fiber module 4 from falling off. In the present embodiment, the inclination angle of the depth direction of the cavity with respect to the thickness direction of the fiber module 4 is not limited, and alternatively, the inclination angle may be 10 ° to 15 °, preferably 15 °.

Preferably, at least two cavities may be provided on the fiber module 4, each of the cavities being not in communication with each other. Preferably, the depth direction of the hollow is inclined with respect to the thickness direction of the fiber module 4, and the inclination angle of the depth direction of each hollow with respect to the thickness direction of the fiber module 4 is uniform. Referring to fig. 1, the depth direction of each cavity is inclined at a uniform angle with respect to the thickness direction of the fiber module 4, and each cavity is filled with a fire-resistant material 5, and the fire-resistant material 5 in each cavity is connected to a fire-resistant layer 6.

For the kiln with the lining structure of the existing kiln cover made of pouring materials and heavy materials anchored by refractory bricks, the construction process of modifying the kiln cover into the composite lining of the embodiment is as follows:

(1) And (3) removing the original pouring material, removing the original anchoring piece structure, correcting the steel plate if the steel plate is deformed after the original pouring material is removed, and replacing the steel structure of the furnace cover 7 and using a new steel structure of the furnace cover 7 if the steel plate is damaged and can not be corrected.

(2) The steel structure of the furnace cover 7 is subjected to rust removal treatment, and the positions of the anchor points are marked according to the arrangement form of the fiber modules 4.

(3) And the welding anchoring piece 1 is firmly welded, and surface welding slag is removed after the welding is finished.

(4) The insulating layer 2 is laid on the furnace cover 7 through the anchor 1.

(5) A fibrous layer 3 is laid on the hot face of the insulating layer 2 and passes through the anchor 1.

(6) The fiber module 4 is installed by auxiliary tools such as a guide rod, a guide pipe and the like, and is subjected to leveling modification according to the installed condition.

(7) A fire-resistant protection material 5 and a fire-resistant protection layer 6 are formed on the surface of the fiber module 4, and a proper cavity is firstly drilled on the fiber module 4, and the cavity is constructed by inclining by 10-15 degrees in order to prevent paint injected into the cavity from falling off.

(8) And injecting a fire-resistant protection material 5 into the hollow hole formed on the fiber module 4, wherein the fire-resistant protection material 5 is higher than the hot surface of the fiber module 4.

(9) And uniformly spraying the refractory protective material on the hot surface of the fiber module 4, wherein the spraying thickness is more than 5mm and less than 8mm, and naturally drying for one week after the construction is finished.

For the existing kiln, the furnace cover uses pouring materials and heavy materials anchored by refractory bricks as lining structures, the temperature of the outer wall is higher than 200 ℃, heat dissipation is large, heat energy conversion is increased, the energy-saving effect is poor, the kiln top materials are completely removed when the service life of the kiln top materials is up, the installation period is long, the cost is high, and the economic burden of kiln users is increased when the pouring materials and the refractory bricks are reinstalled.

In contrast, the furnace cover composite lining of the present embodiment has the following advantages: 1. the heat-insulating surface uses the material with low heat conductivity coefficient as the back lining, effectively utilizes the low heat conductivity coefficient performance of the material to reduce the temperature of the cold surface, and has the effects of energy conservation and environmental protection. 2. The thermal surface layer adopts a temperature-resistant fiber module, such as a 1600 ℃ crystalline alumina fiber module, and the fiber module has high temperature resistance and high temperature stability, and the shrinkage of a heating wire can not exceed 1% below 1500 ℃, so that the thermal surface layer has extremely high temperature resistance. And the heat conductivity coefficient is only 1/5 of that of the heavy casting material, so that the heat insulation material has good heat insulation effect and good energy saving effect. And the density is low, the density is only 1/10 of that of the heavy casting material, and the protection effect on the steel structure and mechanical devices is achieved. 3. The protective layer is coated with a thermal protective coating. The heat protection coating has strong wind erosion resistance after being dried and sintered, and can form a layer of shell on the surface, thereby protecting the fiber module, blocking the convection heat transfer and playing a main role in the service life of the fiber module. The furnace cover composite lining is economical and practical, can prolong the service life of the furnace lining by more than 2 years, is used for the novel furnace lining made of the anode material, and can ensure that the heat preservation and insulation performance of the furnace is not lower than or better than that of the original structure.

The embodiment also provides a kiln, comprising a kiln cover and a lining arranged on the kiln cover, wherein the lining comprises the composite lining for the kiln cover.

The kiln of this example. The composite lining of the furnace cover comprises a heat insulation layer, a fiber layer and a fiber module, wherein the heat insulation layer is paved on the inner wall of the furnace cover, the fiber layer is paved on one side, far away from the furnace cover, of the heat insulation layer, and the fiber module is paved on one side, far away from the furnace cover, of the fiber layer, and the heat conductivity coefficient of the heat insulation layer is smaller than that of the fiber layer and that of the fiber module. The fiber module and the fiber layer have better sealing performance and high temperature resistance, and the heat conductivity coefficient is smaller than that of the traditional casting material, so that heat dissipation can be reduced; the heat conductivity of the heat insulation layer is smaller than that of the fiber layer and the fiber module, and heat conduction can be well blocked, so that the furnace cover composite lining has a good heat insulation effect, heat dissipation can be reduced, and the service life of the furnace cover is prolonged.

The kiln of the present embodiment may be, but not limited to, a shaft kiln or a vertical kiln, for example, a shaft kiln for high temperature industries such as graphitizing of negative electrode materials. The following describes in detail the construction process of retrofitting the kiln cover with specific examples.

Example 1

In the embodiment, a refractory furnace cover of a vertical furnace is taken as an example, a heavy casting material and refractory bricks are used for the original furnace cover, and the original casting material structure is replaced, so that the use temperature is 1350 ℃.

(1) And removing the original pouring material, removing the original anchoring piece structure, and finding the deformation of the steel structure after the original pouring material is removed. And (3) correcting the deformation of part parts, correcting by using a large hammer for heating by using gas flame, and welding and repairing the individual damaged parts of the steel plate.

(2) Derusting treatment is carried out on the surface of the steel plate and the welding correction position to reach the corresponding derusting grade, and then the anchoring point position is marked out according to the arrangement form of the fiber modules.

(3) The metal anchoring piece is welded by using the gold bridge 402 welding rod of the common electric welding machine, the welding is firm and free of sand holes and coating, the welding seam is uniform, the molten pool is full, the ring Zhou Manhan is full, and the surface welding slag is removed after the welding is finished.

(4) Cutting the ultralow heat conducting plate of the low heat insulating material to a corresponding size, paving the low heat insulating material on a furnace cover through the anchoring piece, and cleaning the garbage on the toilet surface by using a dust collector.

(5) After the low-heat-insulating material ultralow heat-conducting plate is paved, a ceramic fiber blanket is paved, and the ceramic fiber blanket passes through the anchoring piece and the fiber blanket to cut the size according to the field condition.

(6) The guide rod is firstly arranged on the bolt according to the position, then the crystal fiber module is pushed to a specified position by the guide rod, and the adjustment is carried out by lightly beating the racket plate. And installing nuts on the bottom bolts of the guide rods by using the guide pipes, and taking down the auxiliary tool after the installation is completed. And carrying out leveling modification according to the condition after the installation.

(7) And (5) painting and spraying the thermal protection coating on the surface of the crystal fiber module. A suitable cavity is first drilled on the new crystalline fiber module with an electric drill. The hollow is inclined by 15 degrees for construction.

(8) And injecting a thermal protection coating into a 15-degree hole drilled by an electric drill by using a glue gun, wherein the coating protrudes out of a fiber hot surface by 5mm.

(9) The thermal protection coating is uniformly sprayed on the crystalline fiber module by using spraying equipment on the hot surface, the spraying thickness is 5mm, the surface is leveled by using a photomask, and the crystalline fiber module is transported to the site for use after being dried for one week.

Example 2

In the embodiment, the refractory furnace cover of a common graphitization furnace is taken as an example, the original furnace cover uses heavy casting materials and refractory bricks, and the original casting material structure is replaced, so that the using temperature is 1400 ℃.

(1) And manufacturing a new steel structure according to the drawing, spraying paint on the cold surface after the steel structure is manufactured, and checking the steel structure after the manufacturing is completed.

(2) And correcting the surface of the steel plate, performing rust removal treatment to reach the corresponding rust removal grade, and then marking out the anchor point position according to the arrangement form of the fiber modules.

(3) The metal anchoring piece is welded by using a common electric welding machine and a gold bridge 402 welding rod, so that the welding is firm and free of sand holes, free of coating, uniform in welding seam, full in molten pool and full in ring Zhou Manhan, and surface welding slag is removed after the welding is finished.

(4) Cutting the ultralow heat conducting plate of the low heat insulating material to a corresponding size, paving the low heat conducting plate on a furnace cover through an anchoring piece, and cleaning surface garbage by using a dust collector.

(5) After the low-heat-insulating material ultralow heat-conducting plate is paved, a ceramic fiber blanket is paved, and the ceramic fiber blanket passes through the anchoring piece and the fiber blanket to cut the size according to the field condition.

(6) The guide rod is firstly arranged on the bolt according to the position, then the crystal fiber module is pushed to a specified position by the guide rod, and the adjustment is carried out by lightly beating the racket plate. And installing nuts on the bottom bolts of the guide rods by using the guide pipes, and taking down the auxiliary tool after the installation is completed. And carrying out leveling modification according to the condition after the installation.

(7) Leveling the surface of the crystal fiber module, sucking floating dust by using a dust collector, and then drilling holes by using an electric drill to incline for 15 degrees. The depth of the holes is 1/2 of that of the fiber modules, and the surfaces of the fiber modules are cleaned by a dust collector after the holes are drilled.

(8) And injecting a thermal protection coating into a 15-degree hole drilled by an electric drill by using a glue gun, wherein the thermal protection coating needs to be filled, holes cannot appear, and the coating protrudes out of a hot surface of the fiber module by 5mm.

(9) The thermal protection coating is uniformly sprayed on the crystalline fiber module by using spraying equipment on the hot surface, the spraying thickness is 5mm, the surface is leveled by using a photomask, and the crystalline fiber module is transported to the site for use after being dried for one week.

The furnace cover composite lining and the furnace provided by the utility model are described in detail. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims (10)

1. The utility model provides a bell composite lining, its characterized in that includes insulating layer, fibrous layer and fibre module, the insulating layer lays in the inner wall of bell, the fibrous layer lay in the insulating layer is kept away from one side of bell, the fibre module lay in the fibrous layer is kept away from one side of bell, the thermal conductivity of insulating layer is less than the fibrous layer and the thermal conductivity of fibre module.

2. The roof composite lining of claim 1, further comprising an anchor fixedly connected to the roof, the anchor passing through the insulating layer and the fibrous layer, the fibrous module being fixedly connected to the anchor.

3. The furnace lid composite lining of claim 1, further comprising a fire resistant protective layer covering a side of the fiber module remote from the furnace lid.

4. A roof composite lining according to claim 3, characterized in that a cavity is provided in the fibre module, which cavity communicates with the side of the fibre module remote from the roof, and in that the cavity is filled with a fire-resistant protective material, which fire-resistant protective material is connected to the fire-resistant protective layer.

5. The furnace lid composite lining of claim 4, wherein a depth direction of the void is inclined with respect to a thickness direction of the fiber module.

6. The furnace lid composite lining according to claim 5, wherein the depth direction of the void is inclined at an angle of 10 ° to 15 ° with respect to the thickness direction of the fiber module.

7. The furnace lid composite liner of claim 4, wherein the void is elongated.

8. The roof composite lining of claim 4, wherein at least two of said voids are provided in said fiber module, each of said voids not being in communication with each other.

9. The furnace lid composite lining of claim 8, wherein the depth direction of the voids is inclined with respect to the thickness direction of the fiber module, and the inclination angle of the depth direction of each of the voids with respect to the thickness direction of the fiber module is uniform.

10. A kiln comprising a furnace lid and a lining disposed on the furnace lid, the lining comprising the furnace lid composite lining of any one of claims 1 to 9.

Images