A device for preventing lining displacement in a cylindrical natural gas hot blast stove

Abstract

This utility model discloses a device for preventing displacement of the inner lining of a cylindrical natural gas hot blast stove, relating to the technical field of cylindrical natural gas hot blast stoves. It includes four arc-shaped plates, each with a 90-degree angle. The four arc-shaped plates are tightly attached to the last ring of refractory bricks at the tail end of the hot blast stove lining. Each pair of adjacent arc-shaped plates has a convex joint and a concave joint. The four arc-shaped plates are assembled into a single retaining ring using these joints. Eight sets of right-angle ribs are provided on the inner wall of the four arc-shaped plates. Each right-angle rib is equidistantly welded to the inner wall of the four arc-shaped plates. This utility model can prevent displacement of the refractory bricks in the hot blast stove lining due to thermal expansion, ensuring the lining's firmness and stability. It features a simple structure, convenient installation, and good performance. The 10mm thickness ensures the ribs' resistance to deformation and enhances the constraint effect on the circumferential displacement of the refractory bricks.

Description

Technical Field

[0001] This utility model relates to the technical field of cylindrical natural gas hot blast stoves, and in particular to a device for preventing displacement of the inner lining of a cylindrical natural gas hot blast stove. Background Technology

[0002] The lining of the natural gas cylindrical hot blast stove is constructed of refractory bricks. Due to the intermittent production operation and frequent heating and cooling of the hot blast stove, the refractory bricks in the lining expand and shift when heated. After cooling, they cannot return to their original position. After long-term operation, the expansion joints of the refractory bricks continue to widen, the furnace lining becomes loose, and the refractory bricks fall off, affecting the furnace life and the safe production of the hot blast stove. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a device to prevent lining displacement in a cylindrical natural gas hot blast stove, solving the problem that the lining of a cylindrical natural gas hot blast stove is constructed of refractory bricks. Due to the intermittent production operation and frequent heating and cooling of the hot blast stove, the refractory bricks in the lining expand and shift when heated, but cannot return to their original position after cooling. After long-term operation, the expansion joints of the refractory bricks continuously widen, the furnace lining loosens, and the refractory bricks fall off, affecting the furnace life and the safe production of the hot blast stove.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A device for preventing displacement of the inner lining of a cylindrical natural gas hot blast stove includes four arc-shaped plates with an angle of 90 degrees. The four arc-shaped plates are closely attached to the last ring of refractory bricks at the tail end of the hot blast stove inner lining. Each pair of arc-shaped plates is provided with a convex joint and a concave joint at their adjacent ends. The four arc-shaped plates are assembled into an integral retaining ring through the convex joint and the concave joint.

[0006] Preferably, the inner walls of the four arc-shaped plates are provided with eight sets of right-angle ribs, and each right-angle rib is welded and fixed to the inner wall of the four arc-shaped plates at equal intervals around its circumference. The outer diameter of the arc-shaped plates is 2660mm, the inner diameter is 2420mm, the thickness is 10mm, and the material is 310S. The right-angle sides of the right-angle ribs are 200mm and 100mm respectively, the thickness is 10mm, and the material is 310S.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] This invention can prevent the refractory bricks in the lining of a hot blast stove from shifting due to thermal expansion, thus ensuring the lining's firmness and stability. It features a simple structure, easy installation, and good performance. Attached Figure Description

[0009] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0010] Figure 1 This is a structural diagram of the entire utility model;

[0011] Figure 2 This is a structural diagram of the arc-shaped plate of this utility model;

[0012] Figure 3 This is a structural diagram of the convex connector of this utility model;

[0013] Figure 4 This is a structural diagram of the concave connector of this utility model.

[0014] Legend: 1. Curved plate; 2. Right-angle rib plate; 3. Convex joint; 4. Concave joint. Detailed Implementation

[0015] This application provides a device to prevent displacement of the inner lining of a cylindrical natural gas hot blast stove, effectively solving the problem that the inner lining of the natural gas cylindrical hot blast stove is constructed of refractory bricks. Due to the intermittent production operation and frequent heating and cooling operations of the hot blast stove, the refractory bricks in the lining expand when heated and shift, but cannot return to their original position after cooling. After long-term operation, the expansion joints of the refractory bricks continue to widen, the inner lining of the stove becomes loose, and the refractory bricks fall off, affecting the service life of the stove and the safe production of the hot blast stove. Example

[0016] like Figures 1-4 As shown, the technical solution in this application aims to effectively address the problem that the lining of a natural gas cylindrical hot blast stove is constructed of refractory bricks. Due to the intermittent production operation and frequent heating and cooling processes of the hot blast stove, the refractory bricks in the lining expand and shift when heated, but cannot return to their original position after cooling. Over long-term operation, the expansion joints of the refractory bricks continuously widen, causing the furnace lining to loosen, refractory bricks to fall off, and affecting the furnace's lifespan and the safe operation of the hot blast stove. The overall approach is as follows:

[0017] To address the problems existing in the prior art, this utility model provides a device for preventing displacement of the inner lining of a cylindrical natural gas hot blast stove. The device includes four arc-shaped plates 1, each with an angle of 90 degrees. The four arc-shaped plates 1 are tightly fitted to the last ring of refractory bricks at the tail end of the hot blast stove's inner lining. Each pair of adjacent arc-shaped plates 1 is equipped with a convex joint 3 and a concave joint 4. The four arc-shaped plates 1 are assembled into a single retaining ring via the convex and concave joints 3 and 4, forming a ring-shaped rigid constraint structure. This structure can tightly fit the tail end of the refractory bricks, directly blocking their radial expansion displacement. The modular design facilitates on-site installation and debugging. The overall retaining ring structure provides uniform ring-shaped support force, preventing uneven local stress on the refractory bricks that could lead to misalignment.

[0018] Eight sets of right-angle stiffeners 2 are provided on the inner walls of the four arc-shaped plates 1. Each right-angle stiffener 2 is welded and fixed to the inner wall of the four arc-shaped plates 1 at equal intervals around its circumference. The right-angle stiffeners 2 form a "well"-shaped reinforcing structure. Their right-angled sides contact the inner wall of the arc-shaped plates 1 and the side of the refractory bricks respectively, which can simultaneously withstand radial expansion force and circumferential shear force. By increasing the contact area, stress is dispersed, preventing the arc-shaped plates 1 from deforming or breaking due to excessive force at a single point, thus improving the overall rigidity of the device. The outer diameter of the arc-shaped plates 1 is 2660mm, the inner diameter is 2420mm, and the thickness is 10mm. The material is 310S. 310S austenitic stainless steel is resistant to high temperature (above 1200℃), oxidation resistant, and 10mm thick. The thick arc-shaped plate 1 forms a rigid support surface, precisely matching the outer diameter (2420mm) of the refractory brick. It maintains structural strength over a long period of time in high-temperature environments, preventing constraint failure due to material softening. At the same time, the precise dimensional design ensures tight positioning of the refractory brick. The right-angled stiffener plate 2 has right-angled sides of 200mm and 100mm respectively, a thickness of 10mm, and is made of 310S material. The 200mm×100mm right-angled side design expands the contact area with the refractory brick, and the 10mm thickness ensures the deformation resistance of the right-angled stiffener plate 2 itself, enhancing the constraint effect on the circumferential displacement of the refractory brick. At the same time, it is made of the same material as the arc-shaped plate 1, avoiding stress cracking due to differences in thermal expansion coefficients.

[0019] Working principle:

[0020] Four arc-shaped plates 1 with a central angle of 90° are arranged close to the last ring of refractory bricks at the tail end of the hot blast stove lining. They are then assembled into a complete circular retaining ring by the convex joints 3 and concave joints 4 at the ends of adjacent arc-shaped plates 1, forming a ring-shaped constraint structure for the refractory bricks.

[0021] Radial limiting: The inner diameter (2420mm) of the arc plate 1 is adapted to the outer diameter of the refractory brick, and its 10mm thick metal plate forms a rigid support surface, directly blocking the radial displacement of the refractory brick caused by thermal expansion.

[0022] Circumferential fixing: 8 sets of right-angle stiffening plates 2 (right-angled sides 200mm×100mm, thickness 10mm) are welded at equal intervals along the inner circumference of the arc-shaped plate 1 to form a "well"-shaped reinforcement structure. The right-angle design of the stiffening plates can simultaneously withstand the radial expansion force and circumferential shear force of the refractory bricks. By increasing the contact area, stress is dispersed, and excessive force at a single point is avoided, which could lead to deformation of the device.

[0023] Both the arc plate 1 and the right-angle stiffener plate 2 are made of 310S stainless steel. Their high temperature resistance (maximum working temperature can reach 1200℃) and oxidation resistance can ensure that the structural strength is maintained for a long time in the high temperature environment of the hot blast furnace, and avoid the loss of restraint function due to material softening failure.

[0024] When the hot blast stove is running, the refractory bricks in the lining expand due to heat, generating an outward thrust. The device converts the expansion force into the internal stress of the metal components through the rigid retaining ring and rib structure. The expansion displacement is offset by the strength reserve of the material itself. At the same time, the modular structural design (convex and concave joints) allows for the coordination of small thermal deformations between each arc plate 1, avoiding local stress concentration caused by excessive overall rigidity.

[0025] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A device for preventing lining displacement in a cylindrical natural gas hot blast stove, comprising an arc-shaped plate (1), characterized in that: The number of the arc-shaped plates (1) is four, the angle of the arc-shaped plates (1) is ninety degrees, and the four arc-shaped plates (1) are closely attached to the last ring of refractory bricks at the tail end of the hot blast stove lining. Each pair of arc plates (1) is provided with a convex joint (3) and a concave joint (4) at their adjacent ends. The four arc plates (1) are assembled into an integral retaining ring by means of the convex joint (3) and the concave joint (4).

2. The device for preventing lining displacement in a cylindrical natural gas hot blast stove according to claim 1, characterized in that: The inner walls of the four arc-shaped plates (1) are provided with eight sets of right-angle ribs (2).

3. The device for preventing lining displacement in a cylindrical natural gas hot blast stove according to claim 2, characterized in that: Each of the right-angle ribs (2) is welded and fixed to the inner wall of the four arc-shaped plates (1) at equal intervals around its circumference.

4. The anti-liner displacement device for a cylindrical natural gas hot blast stove according to claim 3, characterized in that: The arc plate (1) has an outer diameter of 2660mm, an inner diameter of 2420mm, a thickness of 10mm, and is made of 310S material.

5. The anti-liner displacement device for a cylindrical natural gas hot blast stove according to claim 4, characterized in that: The right-angled rib plate (2) has right-angled sides of 200mm and 100mm respectively, a thickness of 10mm, and is made of 310S material.

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