Kiln shell with heat insulation structure

Abstract

The kiln shell with the heat insulation structure comprises a shell body, a filling layer and a refractory brick layer, the shell body extends in the front-back direction, and a heating cavity which is through in the front-back direction is formed in the shell body; the filling layer is fixed to the inner surface of the heating cavity and comprises a filling assembly and refractory powder, the filling assembly is fixedly connected to the inner surface of the shell, a filling gap is formed between the filling assembly and the shell, and the refractory powder is arranged in the filling gap to fill the filling gap; the filling assembly is provided with a plugging structure used for sealing the filling gap, and the plugging structure is provided with a feeding port used for feeding. According to the kiln shell with the heat insulation structure, the filling layer is filled with the magnesia powder, so that the impact of materials on the shell in the using process is reduced, meanwhile, the magnesia powder has low heat conductivity, the heat insulation capacity of the heat insulation structure is improved, and the magnesia powder can be rapidly replaced after the fire resistance of the magnesia powder is reduced.

Description

Technical Field

[0001] This utility model relates to metal smelting, and in particular to a kiln shell with a heat insulation structure. Background Technology

[0002] Metal smelting is the process of changing metals from a combined state to a free state. A common method is to use reducing agents such as carbon, carbon monoxide, and hydrogen to react with metal oxides at high temperatures to obtain elemental metals. In the metal smelting process, kilns are a widely used piece of equipment, especially suitable for certain types of metallurgical processes.

[0003] Kilns include electric arc furnaces, side-blown furnaces, and rotary kilns. Among them, a rotary kiln refers to a kiln that provides a dynamic heating environment through a rotating cylindrical cavity to promote the mixing, reaction, and processing of materials.

[0004] Existing rotary kilns typically form a refractory layer by installing refractory bricks inside a cylindrical cavity. However, during use, the rotation of the cylindrical cavity causes the internal material to impact the inner wall. When the material impacts the refractory layer, the impact force is transmitted to the shell. After prolonged use, the rotary kiln shell will develop dents and deformations, reducing its mechanical strength and potentially causing cracks inside the shell. Utility Model Content

[0005] In order to solve the problem in the prior art where the impact force is transmitted to the shell when the material impacts the refractory layer, this utility model proposes a kiln shell with a heat insulation structure.

[0006] The technical solution of this utility model is as follows: it includes a shell, a filling layer, and a refractory brick layer.

[0007] The housing extends in the front-to-back direction and has a heating chamber that is open at both ends.

[0008] The filling layer is fixed to the inner surface of the heating chamber. The filling layer includes a filling component and refractory powder. The filling component is fixedly connected to the inner surface of the shell. A filling gap is formed between the filling component and the shell. Refractory powder is provided in the filling gap to fill the filling gap. The filling component is provided with a sealing structure to close the filling gap. The sealing structure is provided with a feed port for feeding.

[0009] The refractory brick layer is placed on the inner surface of the filler layer.

[0010] Preferably, the filling assembly includes a plurality of mounting brackets and an inner liner shell. The plurality of mounting brackets are spaced apart on the inner surface of the shell along the extending direction of the shell, and the mounting brackets are fixedly connected to the inner surface of the shell. The plurality of mounting brackets are arranged at intervals to form the mounting structure of the inner liner shell.

[0011] The inner lining shell is located inside the mounting structure, and the inner lining shell is detachably connected to the mounting frame. In the circumferential direction of the mounting frame, there is a material passage gap between the inner lining shell and the mounting frame for the passage of refractory powder.

[0012] Preferably, the filling assembly further includes multiple sets of reinforcing ribs, each set of reinforcing ribs being disposed between two adjacent mounting brackets, each set of reinforcing ribs including multiple reinforcing ribs, the reinforcing ribs extending along the extension direction of the shell, and both ends of the reinforcing ribs being fixedly connected to the adjacent mounting brackets, the reinforcing ribs and the inner liner shell being arranged at radial intervals in the shell.

[0013] Preferably, the filling component is provided with sealing cover plates at both the front and rear ends. The front side of the mounting bracket at the front end and the front side of the inner liner shell form a first mounting surface, and the rear side of the mounting bracket at the rear end and the rear side of the inner liner shell form a second mounting surface. Sealing cover plates are connected to both the first and second mounting surfaces. The shape of the sealing cover plates is adapted to the material passage gap. The sealing structure is a sealing cover plate.

[0014] Preferably, the sealing cover plate located on the rear side has a feed inlet communicating with the filling gap, and a feed valve is provided at the feed inlet.

[0015] Preferably, the mounting bracket at the front end is provided with multiple bolt connection brackets, and the sealing cover plate at the front side has bolt sockets corresponding to the front and rear positions of the bolt connection brackets. Connecting bolts are inserted into the bolt sockets and are threadedly connected to the bolt connection brackets.

[0016] Preferably, the inner surface of the mounting bracket is fixedly connected to a connecting plate, and the inner liner shell is provided with connecting frames corresponding to the connecting plates. The connecting plates extend into the connecting frames, and the connecting plates and connecting frames are detachably connected by bolts.

[0017] Preferably, each mounting bracket is provided with multiple sets of connecting plates and connecting brackets circumferentially between it and the inner liner shell, so that the inner liner shell is centered inside the mounting structure.

[0018] Preferably, the refractory powder is magnesia powder.

[0019] Advantages of this utility model:

[0020] 1. This allows magnesia powder to fill the filler layer, reducing the impact of materials on the shell during use. Furthermore, due to the low thermal conductivity of magnesia powder, it can provide an additional thermal insulation barrier between the refractory bricks and the shell, reducing the conduction of high temperatures to the shell.

[0021] 2. When the refractory properties of magnesia powder decrease after long-term use, it can be quickly replaced. The magnesia powder in the filling layer can be quickly replaced by a short shutdown. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the main structure of Example 1;

[0024] Figure 2 This is a schematic diagram of the filling component structure in Example 1;

[0025] Figure 3 This is an exploded view of the infill component;

[0026] Figure 4 for Figure 3 A magnified structural diagram at point A.

[0027] In the figure, 1 is the shell, 2 is the filling component, 201 is the mounting bracket, 202 is the reinforcing rib, 203 is the inner lining shell, 3 is the refractory brick layer, 4 is the sealing cover plate, 5 is the feed valve, 6 is the bolt connection bracket, 7 is the connecting bolt, 8 is the connecting plate, and 9 is the connecting bracket. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1: In this example, the kiln is a rotary kiln.

[0030] according to Figures 1 to 4 The aforementioned includes a shell 1, a filling layer, and a refractory brick layer 3.

[0031] The housing 1 extends in the front-to-back direction, and the housing 1 has a heating cavity that is open in both the front and back.

[0032] The filling layer is fixed to the inner surface of the heating chamber. The filling layer includes a filling component 2 and refractory powder. The refractory powder is selected as magnesia powder. The filling component 2 is fixedly connected to the inner surface of the shell 1. The filling component 2 includes multiple mounting brackets 201 and an inner lining shell 203. The multiple mounting brackets 201 are spaced apart along the extension direction of the shell 1 on the inner surface of the shell 1, and the mounting brackets 201 are fixedly connected to the inner surface of the shell 1. The multiple mounting brackets 201 are spaced apart to form the mounting structure of the inner lining shell 203. The inner lining shell 203 is located inside the mounting structure, and the inner lining shell 203 is detachably connected to the mounting brackets 201.

[0033] A connecting plate 8 is fixedly connected to the inner surface of the mounting bracket 201. The inner liner shell 203 is provided with connecting frames 9 that correspond one-to-one with the connecting plates 8. The connecting plates 8 extend into the connecting frames 9. The connecting plates 8 and the connecting frames 9 are detachably connected by bolts. Multiple sets of connecting plates 8 and connecting frames 9 are arranged circumferentially between each mounting bracket 201 and the inner liner shell 203 so that the inner liner shell 203 is centered inside the installation structure. The mounting bracket 201 can be installed first, so that the mounting bracket 201 is welded to the inner wall of the inner liner shell 203, and then the inner liner shell 203 is installed, which simplifies the installation process and facilitates construction.

[0034] The filling component 2 also includes multiple sets of reinforcing ribs 202. Each set of reinforcing ribs 202 is disposed between two adjacent mounting brackets 201. Each set of reinforcing ribs 202 includes multiple reinforcing ribs 202. The reinforcing ribs 202 extend along the extension direction of the housing 1, and both ends of the reinforcing ribs 202 are fixedly connected to the adjacent mounting brackets 201. The reinforcing ribs 202 and the inner liner housing 203 are arranged radially spaced in the housing 1 to connect multiple mounting brackets 201 into one unit and enhance mechanical strength.

[0035] A filling gap is formed between the inner lining shell 203 and the shell 1. Refractory powder is provided in the filling gap to fill the gap. In the circumferential direction of the mounting frame 201, a material passage gap is left between the inner lining shell 203 and the mounting frame 201 for the refractory powder to pass through.

[0036] The filling assembly 2 is provided with a sealing structure for closing the filling gap. The sealing structure is a sealing cover plate 4. Both the front and rear ends of the filling assembly 2 are provided with sealing cover plates 4. The front side of the mounting bracket 201 at the front end and the front side of the inner liner shell 203 form a first mounting surface. The rear side of the mounting bracket 201 at the rear end and the rear side of the inner liner shell 203 form a second mounting surface. The sealing cover plate 4 is connected to both the first mounting surface and the second mounting surface. The sealing cover plate 4 is adapted to the shape of the material passage gap.

[0037] The sealing cover plate 4 located on the rear side has an inlet that communicates with the filling gap. The inlet is equipped with a feed valve 5, which facilitates the feeding of magnesium sand powder into the filling gap through the feed valve 5.

[0038] The mounting bracket 201 at the front end is equipped with multiple bolt connection brackets 6. The sealing cover plate 4 on the front side has bolt sockets corresponding to the positions of the bolt connection brackets 6. Connecting bolts 7 are inserted into the bolt sockets and are threadedly connected to the bolt connection brackets 6. Due to the decrease in fire resistance of magnesia powder after long-term use, the magnesia powder needs to be replaced. When the magnesia powder needs to be replaced, the sealing cover plate 4 on the front side is removed and the magnesia powder is taken out.

[0039] The refractory brick layer 3 is disposed on the inner surface of the filling layer, that is, on the inner surface of the inner lining shell 203. In this embodiment, the refractory bricks are laid on the inner surface of the inner lining shell 203 by refractory mortar.

[0040] Operating principle: Open the feed valve 5 to fill the gap with magnesium sand powder. By rotating the housing 1 and filling multiple times, the gap is filled with magnesium sand powder.

[0041] When in use, when the material impacts the refractory brick layer 3, the inner lining shell 203 applies an impact force to the filling layer. The magnesia powder in the filling gap absorbs the vibration and impact generated. When the material impacts the shell 1, the magnesia powder layer can disperse the local concentrated force to a larger area, thereby avoiding deformation or cracks caused by local overload.

[0042] This allows magnesia powder to absorb vibration and impact, while dispersing localized concentrated forces over a larger area. Furthermore, magnesia powder has a low thermal conductivity, which can provide an additional thermal insulation barrier between the refractory bricks and the shell 1, reducing the conduction of high temperatures to the shell 1.

[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims and not by the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A kiln shell with a thermally insulated structure, characterized by: It includes a shell (1), a filling layer and a refractory brick layer (3). The housing (1) extends in the front-to-back direction, and the housing (1) is provided with a heating cavity that is open in the front and back; The filling layer is fixed to the inner surface of the heating chamber. The filling layer includes a filling component (2) and refractory powder. The filling component (2) is fixedly connected to the inner surface of the shell (1). A filling gap is formed between the filling component (2) and the shell (1). Refractory powder is provided in the filling gap to fill the filling gap. The filling component (2) is provided with a sealing structure to close the filling gap. The sealing structure is provided with a feed port for feeding. The refractory brick layer (3) is placed on the inner surface of the filling layer.

2. The kiln shell with heat insulation structure according to claim 1, characterized in that: The filling component (2) includes a plurality of mounting brackets (201) and an inner liner shell (203). The plurality of mounting brackets (201) are spaced apart on the inner surface of the shell (1) along the extending direction of the shell (1), and the mounting brackets (201) are fixedly connected to the inner surface of the shell (1). The plurality of mounting brackets (201) are spaced apart to form the mounting structure of the inner liner shell (203). The inner lining shell (203) is located inside the mounting structure, and the inner lining shell (203) is detachably connected to the mounting frame (201). In the circumferential direction of the mounting frame (201), there is a material passage gap between the inner lining shell (203) and the mounting frame (201) for the refractory powder to pass through.

3. A kiln shell with a thermally insulated structure according to claim 2, characterized in that: The filling component (2) also includes multiple sets of reinforcing ribs (202). Each set of reinforcing ribs (202) is disposed between two adjacent mounting brackets (201). Each set of reinforcing ribs (202) includes multiple reinforcing ribs (202). The reinforcing ribs (202) extend along the extension direction of the shell (1), and both ends of the reinforcing ribs (202) are fixedly connected to the adjacent mounting brackets (201). The reinforcing ribs (202) and the inner liner shell (203) are arranged radially at intervals in the shell (1).

4. A kiln shell with a thermally insulated structure according to claim 3, characterized in that: The filling component (2) is provided with sealing cover plates (4) at both the front and rear ends. The front side of the mounting bracket (201) at the front end and the front side of the inner liner shell (203) form a first mounting surface. The rear side of the mounting bracket (201) at the rear end and the rear side of the inner liner shell (203) form a second mounting surface. The sealing cover plates (4) are connected to both the first and second mounting surfaces. The sealing cover plates (4) are adapted to the shape of the material passage gap. The sealing structure is the sealing cover plate (4).

5. A kiln shell with a thermally insulated structure according to claim 4, characterized in that: The sealing cover plate (4) located on the rear side has an inlet that communicates with the filling gap, and an inlet valve (5) is provided at the inlet.

6. A kiln shell according to any one of claims 2 to 4, wherein: The mounting bracket (201) located at the front end is provided with multiple bolt connection brackets (6). The sealing cover plate (4) located on the front side is provided with bolt sockets corresponding to the positions of the bolt connection brackets (6). Connecting bolts (7) are inserted into the bolt sockets and are threadedly connected to the bolt connection brackets (6).

7. A kiln shell according to any one of claims 2 to 4, wherein: The inner surface of the mounting bracket (201) is fixedly connected to a connecting plate (8), and the inner liner shell (203) is provided with a connecting frame (9) corresponding to the connecting plate (8). The connecting plate (8) extends into the connecting frame (9), and the connecting plate (8) and the connecting frame (9) are detachably connected by bolts.

8. A kiln shell with a thermally insulated structure according to claim 7, characterized in that: A plurality of connecting plates (8) and connecting frames (9) are arranged circumferentially between each mounting frame (201) and the inner liner shell (203) to center the inner liner shell (203) inside the mounting structure.

9. A kiln shell with a thermally insulated structure according to any one of claims 1 to 4, characterized in that: The refractory powder is selected from magnesia powder.

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