Slow cooling area structure of kiln

Abstract

The slow cooling area structure comprises a kiln chamber, a kiln box and a roller bar, the kiln box comprises a kiln top, a first kiln wall, a kiln bottom and a second kiln wall which are sequentially connected, and the kiln top comprises an upper heat preservation layer, an upper slow cooling layer and an upper heat insulation layer which are sequentially arranged from inside to outside; the upper heat preservation layer is formed by laying ceiling bricks, and the upper heat insulation layer is formed by laying ceramic fiber blankets. The upper slow cooling layer comprises a plurality of first pipelines used for leading in liquid, the first pipelines are installed between the upper heat preservation layer and the upper heat insulation layer side by side at intervals in the horizontal direction, and a first slow cooling cavity is reserved between the upper heat preservation layer and the upper heat insulation layer. According to the scheme, materials in the kiln can be effectively, uniformly and slowly cooled, and the situation that the materials are subjected to cold cracks due to stress generated by different positions of material products on the same cross section of the kiln due to inconsistent cooling speeds is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of kilns, in particular to a slow cooling zone structure of a kiln. Background Art

[0002] During the firing process of materials (such as tiles, etc.), a slow cooling stage must be set up. The purpose is to prevent the material from cold cracking due to rapid cooling by cooling it down gently.

[0003] Currently, kilns used for ceramic firing typically utilize multiple, horizontally spaced heat exchange tubes. This indirect heat exchange mechanism allows the cool air within the tubes to exchange heat with the hot gases within the kiln, thereby slowly cooling the material. Typically, an air inlet is located at one end of the tubes to draw in the cool air, while the other end is connected to an exhaust duct to discharge the absorbed hot air.

[0004] However, in actual work, it was found that due to the low temperature at the end where the cold air enters and the high temperature at the end where the hot air exits, stress was generated at different positions of the material products on the same cross-section of the kiln due to inconsistent cooling speeds, resulting in cold cracking of the material. Utility Model Content

[0005] The purpose of the utility model is to propose a slow cooling zone structure of a kiln, which can effectively and evenly cool the material in the kiln, avoid the situation where the material products at different positions on the same cross section of the kiln generate stress due to inconsistent cooling speeds, resulting in cold cracking of the material, and overcome the shortcomings of the existing technology.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A slow cooling zone structure of a kiln comprises a kiln chamber, a kiln box and rollers, wherein the kiln box is installed inside the kiln chamber;

[0008] The kiln box includes a kiln roof, a first kiln wall, a kiln bottom, and a second kiln wall connected in sequence, and the kiln roof, the first kiln wall, the kiln bottom, and the second kiln wall together form a kiln tunnel for conveying materials; a plurality of rollers are provided, and the plurality of rollers are horizontally installed in parallel inside the kiln tunnel, and the rollers rotate relative to the kiln box;

[0009] The kiln roof includes an upper thermal insulation layer, an upper slow cooling layer and an upper thermal insulation layer which are arranged in sequence from the inside to the outside; the upper thermal insulation layer is paved with ceiling tiles, and the upper thermal insulation layer is paved with ceramic fiber blanket; the upper slow cooling layer includes a plurality of first pipes for introducing liquid, and the plurality of first pipes are installed in parallel and at intervals between the upper thermal insulation layer and the upper thermal insulation layer in the horizontal direction, and a first slow cooling cavity is left between the upper thermal insulation layer and the upper thermal insulation layer.

[0010] Preferably, the upper insulation layer is in contact with the top of the first pipe, and a gap is left between the upper insulation layer and the bottom of the first pipe.

[0011] Preferably, the kiln bottom includes a lower insulation layer, a lower slow cooling layer and a supporting brick layer arranged in sequence from the inside to the outside; the lower insulation layer is paved with mullite bricks, and the lower slow cooling layer includes a plurality of second pipes for introducing liquid, and the plurality of second pipes are installed in parallel and at intervals in the horizontal direction between the lower insulation layer and the supporting brick layer, and a second slow cooling cavity is left between the lower insulation layer and the supporting brick layer.

[0012] Preferably, the lower slow cooling layer further includes a plurality of support blocks, and the plurality of support blocks are evenly positioned between the lower thermal insulation layer and the support brick layer.

[0013] Preferably, a gap is left between the lower insulation layer and the top of the second pipe, and a gap is left between the supporting brick layer and the bottom of the second pipe.

[0014] Preferably, the kiln bottom further includes a lower thermal insulation layer, the lower thermal insulation layer is attached to the top of the lower thermal insulation layer, and the lower thermal insulation layer is a polycrystalline fiber blanket.

[0015] Preferably, the inlet and outlet of the first pipe protrude from both sides of the kiln chamber respectively;

[0016] The inlet and the outlet of the second pipe protrude from both sides of the kiln chamber respectively.

[0017] The technical solution provided by the utility model may have the following beneficial effects:

[0018] 1. Multiple first pipes for introducing liquids are installed on the kiln roof. Through liquid cooling, the liquid in the first pipes exchanges heat with the high-temperature gas in the kiln, thereby slowly cooling the material. Since the specific heat capacity of liquids is usually larger than that of gases, this means that the liquid needs to absorb more heat to increase its temperature by the same amount; in addition, the thermal conductivity of liquids is usually better than that of gases, so heat spreads faster in the liquid, but this also means that the temperature of the liquid rises more evenly after absorbing heat, rather than being concentrated in a certain area. Therefore, using liquid cooling to cool the slow cooling zone structure of the kiln can effectively balance the temperature on the same cross-section of the kiln, avoiding stress caused by inconsistent cooling rates at different locations of the material product on the same cross-section of the kiln, which can lead to cold cracking of the material.

[0019] 2. In order to allow the first pipeline to directly contact the high-temperature gas in the kiln, accelerate the liquid's absorption of heat, and cause the material to crack due to rapid cooling, an upper insulation layer and an upper heat-insulating layer made of insulation materials are provided in the kiln roof; furthermore, a first slow-cooling cavity (i.e., an air heat-absorbing layer) is left between the upper insulation layer and the upper heat-insulating layer to achieve dual slow cooling of gas and liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional schematic diagram of the slow cooling zone structure of a kiln of the present invention.

[0021] Figure 2 It is a cross-sectional schematic diagram of the kiln box in the utility model.

[0022] Among them: kiln chamber 1;

[0023] Kiln box 2, kiln roof 21, upper insulation layer 211, upper slow cooling layer 212, first pipe 2121, first slow cooling cavity 2122, upper insulation layer 213, first kiln wall 22, kiln bottom 23, lower insulation layer 231, lower slow cooling layer 232, second pipe 2321, second slow cooling cavity 2322, support block 2323, support brick layer 233, lower insulation layer 234, second kiln wall 24;

[0024] Roller 3. DETAILED DESCRIPTION

[0025] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0026] The present technical solution provides a slow cooling zone structure of a kiln, comprising a kiln chamber 1, a kiln box 2 and rollers 3, wherein the kiln box 2 is installed inside the kiln chamber 1;

[0027] The kiln box 2 includes a kiln roof 21, a first kiln wall 22, a kiln bottom 23, and a second kiln wall 24 connected in sequence, and the kiln roof 21, the first kiln wall 22, the kiln bottom 23, and the second kiln wall 24 together form a kiln tunnel for conveying materials; a plurality of rollers 3 are provided, and the plurality of rollers 3 are horizontally installed in parallel inside the kiln tunnel, and the rollers 3 rotate relative to the kiln box 2;

[0028] The kiln roof 21 includes an upper insulation layer 211, an upper slow cooling layer 212 and an upper thermal insulation layer 213 arranged in sequence from the inside to the outside; the upper insulation layer 211 is paved with ceiling tiles, and the upper thermal insulation layer 213 is paved with ceramic fiber blanket; the upper slow cooling layer 212 includes a plurality of first pipes 2121 for passing liquid, and the plurality of first pipes 2121 are installed in parallel and at intervals in the horizontal direction between the upper insulation layer 211 and the upper thermal insulation layer 213, and a first slow cooling cavity 2122 is left between the upper insulation layer 211 and the upper thermal insulation layer 213.

[0029] In order to cool the material in the kiln evenly and slowly, and avoid the situation where the material on the same cross section of the kiln produces stress due to inconsistent cooling speed at different positions, which leads to cold cracking of the material, this technical solution proposes a slow cooling zone structure of the kiln, such as Figure 1-2 As shown, it includes a kiln chamber 1, a kiln box 2 for achieving a slow cooling effect, and rollers 3 for conveying materials, wherein the kiln box 2 of this solution is surrounded by a kiln top 21, a first kiln wall 22, a kiln bottom 23 and a second kiln wall 24.

[0030] Specifically, the present solution provides a plurality of first pipes 2121 for introducing liquid (such as water, etc.) on the kiln roof 21. Through liquid cooling, the liquid in the first pipe 2121 exchanges heat with the high-temperature gas in the kiln, thereby slowly cooling the material. Since the specific heat capacity of liquid is usually larger than that of gas, this means that the liquid needs to absorb more heat to increase its temperature by the same amount; in addition, the thermal conductivity of liquid is usually better than that of gas, so heat propagates faster in the liquid, but this also means that the temperature of the liquid rises more evenly after absorbing heat, rather than being concentrated in a certain area. Therefore, the use of liquid cooling for the slow cooling zone structure of the kiln can effectively balance the temperature on the same cross section of the kiln, avoiding stress caused by inconsistent cooling speeds at different positions of the material product on the same cross section of the kiln, which leads to cold cracking of the material.

[0031] Furthermore, in order to allow the first pipe 2121 to directly contact the high-temperature gas in the kiln, accelerate the liquid's absorption rate of heat, and cause the material to cold crack due to rapid cooling, the present solution also provides an upper insulation layer 211 and an upper heat-insulating layer 213 made of insulation material in the kiln roof 21; further, a first slow cooling cavity 2122 (i.e., an air heat-absorbing layer) is left between the upper insulation layer 211 and the upper heat-insulating layer 213 to achieve dual slow cooling of gas and liquid.

[0032] It should be noted that the ceiling bricks of this solution are conventional structures in kilns, which are generally hung on the top beams of the kiln chamber 1 through hanging bricks. For the specific structure, please refer to the Chinese utility model patent disclosed as CN208269639U.

[0033] To further explain, the upper insulation layer 214 is in contact with the top of the first pipe 2121 , and a gap is left between the upper insulation layer 211 and the bottom of the first pipe 2121 .

[0034] In addition, in order to increase the slow cooling effect of the first slow cooling chamber 2122, this solution also leaves a gap between the upper insulation layer 211 and the bottom of the first pipe 2121 to increase the space of the first slow cooling chamber 2122 and prevent the first pipe 2121 from deforming.

[0035] To further explain, the kiln bottom 23 includes a lower insulation layer 231, a lower slow cooling layer 232 and a supporting brick layer 233 arranged in sequence from the inside to the outside; the lower insulation layer 231 is paved with mullite bricks, and the lower slow cooling layer 232 includes a plurality of second pipes 2321 for passing liquid, and the plurality of second pipes 2321 are installed in parallel and at intervals in the horizontal direction between the lower insulation layer 231 and the supporting brick layer 233, and a second slow cooling cavity 2322 is left between the lower insulation layer 231 and the supporting brick layer 233.

[0036] In a preferred embodiment of the present technical solution, the kiln bottom 23 is also provided with a matching structure of pipes and slow cooling chambers similar to those of the kiln top 21 to further enhance the dual slow cooling effect of the slow cooling zone structure.

[0037] To further illustrate, the lower slow cooling layer 232 further includes a plurality of support blocks 2323 , and the plurality of support blocks 2323 are evenly positioned between the lower thermal insulation layer 231 and the support brick layer 233 .

[0038] As a preferred embodiment of the above embodiment, the present solution further provides a plurality of supporting blocks 2323 between the lower insulation layer 231 and the supporting brick layer 233 to prevent the second pipe 2321 from being subjected to excessive stress, thereby causing deformation of the pipe.

[0039] To further illustrate, a gap is left between the lower insulation layer 231 and the top of the second pipe 2321 , and a gap is left between the supporting brick layer 233 and the bottom of the second pipe 2321 .

[0040] As a preferred embodiment of the above embodiment, this solution reserves a certain space between the top and bottom of the second pipe 2321 to increase the cross-sectional area of ​​the second slow cooling chamber 2322, thereby enhancing the slow cooling effect of the second slow cooling chamber 2322.

[0041] To further illustrate, the kiln bottom 23 further includes a lower heat insulation layer 234 , which is attached to the top of the lower thermal insulation layer 231 and is a polycrystalline fiber blanket.

[0042] Furthermore, the present solution also provides a lower thermal insulation layer 234 made of polycrystalline fiber blanket on top of the lower thermal insulation layer 231 to reduce heat loss of the kiln and improve energy efficiency, while also helping to protect the kiln structure and extend the service life of the kiln.

[0043] To further illustrate, the inlet and outlet of the first pipe 2121 are respectively protruded from both sides of the kiln chamber 1; the inlet and outlet of the second pipe 2321 are respectively protruded from both sides of the kiln chamber 1. This facilitates the entry of liquid.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0046] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0049] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0050] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will be able to devise other specific implementations of the present invention without inventive effort, and such implementations will fall within the scope of protection of the present invention.

Claims

1. A slow cooling zone structure of a kiln, characterized by: It includes a kiln chamber, a kiln box and rollers, wherein the kiln box is installed inside the kiln chamber; The kiln box includes a kiln roof, a first kiln wall, a kiln bottom, and a second kiln wall connected in sequence, and the kiln roof, the first kiln wall, the kiln bottom, and the second kiln wall together form a kiln tunnel for conveying materials; a plurality of rollers are provided, and the plurality of rollers are horizontally installed in parallel inside the kiln tunnel, and the rollers rotate relative to the kiln box; The kiln roof includes an upper thermal insulation layer, an upper slow cooling layer and an upper thermal insulation layer which are arranged in sequence from the inside to the outside; the upper thermal insulation layer is paved with ceiling tiles, and the upper thermal insulation layer is paved with ceramic fiber blanket; the upper slow cooling layer includes a plurality of first pipes for introducing liquid, and the plurality of first pipes are installed in parallel and at intervals between the upper thermal insulation layer and the upper thermal insulation layer in the horizontal direction, and a first slow cooling cavity is left between the upper thermal insulation layer and the upper thermal insulation layer.

2. The slow cooling zone structure of a kiln according to claim 1, characterized in that: The upper heat-insulating layer is in contact with the top of the first pipe, and a gap is left between the upper heat-insulating layer and the bottom of the first pipe.

3. The slow cooling zone structure of a kiln according to claim 1, characterized in that: The kiln bottom includes a lower insulation layer, a lower slow cooling layer and a supporting brick layer arranged in sequence from the inside to the outside; the lower insulation layer is paved with mullite bricks, and the lower slow cooling layer includes a plurality of second pipes for passing liquid, and the plurality of second pipes are installed in parallel and at intervals in the horizontal direction between the lower insulation layer and the supporting brick layer, and a second slow cooling cavity is left between the lower insulation layer and the supporting brick layer.

4. The slow cooling zone structure of a kiln according to claim 3, characterized in that: The lower slow cooling layer further includes a plurality of support blocks, and the plurality of support blocks are evenly positioned between the lower thermal insulation layer and the support brick layer.

5. The slow cooling zone structure of a kiln according to claim 3, characterized in that: A gap is left between the lower insulation layer and the top of the second pipe, and a gap is left between the supporting brick layer and the bottom of the second pipe.

6. The slow cooling zone structure of a kiln according to claim 3, characterized in that: The kiln bottom further comprises a lower heat insulation layer, which is attached to the top of the lower thermal insulation layer and is a polycrystalline fiber blanket.

7. The slow cooling zone structure of a kiln according to claim 3, characterized in that: The inlet and outlet of the first pipe protrude from both sides of the kiln chamber respectively; The inlet and the outlet of the second pipe protrude from both sides of the kiln chamber respectively.

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