Side wall structure of high-strength pellet shaft furnace

Abstract

The utility model provides a high-strength pellet shaft furnace side wall structure, shaft furnace comprises a hearth and a combustion chamber which are located in the furnace shell, the combustion chamber is located outside the hearth and is communicated with the hearth through a flue, the flue comprises an inner wall and an outer wall, the inner wall is located on one side close to the hearth, and the outer wall is located on the other side close to the hearth. The outer wall is attached to the furnace shell, a plurality of supporting assemblies are distributed between the inner wall and the outer wall at intervals, and the supporting assemblies are used for transmitting side pressure borne by the inner wall to the furnace shell. Connection of the inner wall and the outer wall is achieved through the supporting assembly, pellet side pressure borne by the inner wall can be finally transmitted to the furnace shell steel structure through the supporting assembly, in other words, the furnace shell steel structure supports the inner wall, the inner wall can be effectively prevented from cracking and collapsing, the service life of the shaft furnace lining is prolonged, and the shutdown overhaul time is shortened.

Description

Technical Field

[0001] This utility model relates to the field of vertical shaft furnace technology for pelletizing ore, and specifically to a side wall structure for a high-strength vertical shaft furnace for pelletizing ore. Background Technology

[0002] Vertical shaft furnaces are one of the production processes for pelletizing ore. A vertical shaft furnace consists of a steel furnace shell and a refractory lining, and can be divided into the furnace chamber, combustion chamber, flue, and air guide walls. The furnace chamber can be further divided into a drying section, a preheating section, a roasting section, a soaking section, and a cooling section. In existing vertical shaft furnaces, the furnace side walls (i.e., the inner walls of the flue) are constructed from standard bricks from bottom to top. Except for the bottom support by the furnace shell, the upper part of the furnace side walls has no lateral supports, and the upper part of the furnace side walls is completely independent of the combustion chamber flue side walls (i.e., the outer walls of the flue).

[0003] In actual production, the lifespan of a vertical shaft furnace primarily depends on the service life of its refractory lining. Due to thermal stress and the thermal expansion of the refractory bricks in the furnace sidewalls (i.e., the inner walls of the flue), the working surfaces of the sidewalls crack, resulting in a loose structure. Furthermore, the lateral impact of materials falling into the furnace on the sidewalls makes them prone to collapse, damaging the furnace interior, reducing the lining's lifespan, and increasing downtime for maintenance. Therefore, the lifespan of the furnace sidewalls is the most critical factor determining the lifespan of a vertical shaft furnace.

[0004] In summary, there is an urgent need for a high-strength sidewall structure for a pelletizing vertical shaft furnace to solve the problems existing in the current technology. Utility Model Content

[0005] The purpose of this utility model is to provide a high-strength sidewall structure for a pelletizing vertical shaft furnace, aiming to solve the problem that the sidewall of the furnace (i.e., the inner wall of the flue) of existing vertical shaft furnaces is prone to deformation and collapse due to the lateral impact force generated by falling materials. The specific technical solution is as follows:

[0006] A sidewall structure for a high-strength pelletizing vertical shaft furnace, the furnace including a furnace chamber and a combustion chamber located inside the furnace shell, the combustion chamber being located outside the furnace chamber and connected to it via a flue, the flue including an inner wall and an outer wall, the inner wall being located on the side closer to the furnace chamber, the outer wall being disposed against the furnace shell, and multiple sets of support assemblies spaced apart between the inner wall and the outer wall, the support assemblies being used to transmit the lateral pressure on the inner wall to the furnace shell.

[0007] Preferably, the support assembly includes a support member and a base, and both the inner wall and the outer wall are provided with bases. The two ends of the support member are respectively connected to the bases on the inner wall and the bases on the outer wall.

[0008] Preferably, the support member and the base are connected by a protrusion and a cavity.

[0009] Preferably, the gap between the support and the base is filled with a ceramic fiber blanket.

[0010] Preferably, both the support member and the base are provided with a steel reinforcement skeleton inside.

[0011] Preferably, both the support and the base are made of high-alumina refractory material.

[0012] Preferably, the support member is streamlined in the direction of flue gas flow.

[0013] Preferably, both the outer wall and the inner wall are constructed from bottom to top using standard bricks, and the base is embedded in the outer wall and the inner wall. The height H of the base is an integer multiple of the height of the standard brick.

[0014] Preferably, the bottom surface of the inner wall is supported by the furnace shell; heavy high-alumina bricks are provided between the outer bottom of the inner wall and the refractory lining of the combustion chamber.

[0015] Preferably, at least two sets of support components are spaced apart between the inner wall and the outer wall in both the vertical and horizontal directions.

[0016] The application of the technical solution of this utility model has the following beneficial effects:

[0017] This utility model uses a support component to connect the inner wall and the outer wall. The pressure from the pellet ore side on the inner wall can ultimately be transferred to the furnace shell steel structure by the support component. In other words, the furnace shell steel structure provides support for the inner wall, which can effectively prevent the inner wall from cracking and collapsing, extend the service life of the vertical furnace lining, and reduce downtime for maintenance.

[0018] The support components and base in the support assembly are made of high-aluminum materials and have an internal steel reinforcement frame, which enhances the strength and stability of the support assembly. The support components are streamlined in the flue gas scouring direction to reduce the resistance of flue gas flow and reduce the scouring effect of flue gas on the support components.

[0019] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 This is a cross-sectional view of the vertical furnace in this utility model;

[0022] Figure 2 yes Figure 1Sectional view at point AA;

[0023] Figure 3 yes Figure 1 A schematic diagram of the structure of the central support component;

[0024] Figure 4 yes Figure 3 Front view of the central support component;

[0025] Figure 5 yes Figure 3 Side view of the central support component;

[0026] Among them, 1. Furnace shell, 2. Furnace chamber, 3. Combustion chamber, 4. Flue, 4.1. Outer wall, 4.2. Inner wall, 5. Air guide wall, 6. Material, 7. Support components, 7.1. Supporting parts, 7.2. Base, 7.3. Steel reinforcement frame. Detailed Implementation

[0027] To facilitate understanding of this invention, a more comprehensive description is provided below, along with preferred embodiments. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this invention.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0029] Example:

[0030] See Figures 1-5 This embodiment provides a sidewall structure for a high-strength pellet vertical shaft furnace. The furnace includes a furnace chamber 2 and a combustion chamber 3 located inside the furnace shell 1. The combustion chamber 3 is located outside the furnace chamber 2 and the two are connected by a flue 4. In this embodiment, there are two combustion chambers 3, which are arranged on both sides of the furnace chamber 2. Each combustion chamber 3 is connected to the furnace chamber 2 by a flue 4. The high-temperature flue gas from the combustion chamber 3 enters the interior of the furnace chamber 2 through the flue 4, thereby drying and roasting the material 6 inside the furnace chamber 2.

[0031] Furthermore, the flue 4 includes an inner wall 4.2 and an outer wall 4.1. The inner wall 4.2 is located on the side closer to the furnace 2 (the inner wall is also the side wall of the furnace 2, i.e., the inner wall separates the furnace and the flue), and the outer wall 4.1 is set against the furnace shell 1. The inner side of the inner wall 4.2 is the furnace 2. The material falling inside the furnace 2 will generate lateral pressure on the inner wall 4.2, which may cause the inner wall 4.2 to collapse. To solve this problem, in this embodiment, multiple sets of support components 7 are arranged at intervals between the inner wall 4.2 and the outer wall 4.1. The support components 7 are used to transfer the lateral pressure on the inner wall 4.2 to the furnace shell 1 (i.e., the support components provide lateral support to the inner wall), thereby preventing the inner wall 4.2 from deforming and collapsing.

[0032] like Figure 3 As shown, the support assembly 7 includes a support member 7.1 and a base 7.2. Both the inner wall 4.2 and the outer wall 4.1 are provided with bases 7.2. The two ends of the support member 7.1 are connected to the bases 7.2 on the inner wall 4.2 and the outer wall 4.1, respectively. During the material falling process, the lateral pressure on the inner wall 4.2 is transmitted from the bases 7.2 on the inner wall 4.2 to the support member 7.1, and then through the support member 7.1 to the bases 7.2 on the outer wall, ultimately acting on the furnace shell 1. This provides a supporting force for the inner wall 4.2, preventing deformation or collapse of the inner wall.

[0033] Preferably, in this embodiment, the support member 7.1 and the base 7.2 are connected by a protrusion and a cavity; in this embodiment, both ends of the support member are provided with protrusions, and both bases 7.2 are provided with cavities. The support member and the base are quickly connected by the cooperation of the protrusions and cavities (i.e., the protrusion is inserted into the cavity), thereby realizing the transmission of force. Furthermore, the gap between the support member 7.1 and the base 7.2 is filled with ceramic fiber blanket, which is used as an expansion joint.

[0034] Preferably, both the support member 7.1 and the base 7.2 are internally provided with a steel reinforcement cage 7.3, thereby improving the structural strength and stability of the support assembly, enhancing the structure's resistance to the impact of flue gas, and thus providing long-term and effective support for the inner wall. Figure 4 and Figure 5 As shown, the steel reinforcement cage 7.3 generally includes horizontal steel bars and stirrups. Multiple horizontal steel bars are arranged at intervals in the horizontal and vertical directions, and the horizontal steel bars are lapped together by multiple stirrups to form the steel reinforcement cage 7.3. Of course, those skilled in the art can adjust and optimize the structure of the steel reinforcement cage according to the actual situation. In this embodiment, the possible structural forms of the steel reinforcement cage are not listed one by one.

[0035] Preferably, both the support member 7.1 and the base 7.2 are made of high-alumina refractory material, which has good refractory properties and meets the working environment requirements of the vertical shaft furnace. Furthermore, in this embodiment, both the support member 7.1 and the base 7.2 are prefabricated, which can reduce the complexity of subsequent construction and improve construction efficiency; however, in some embodiments, the support member 7.1 and the base 7.2 may also be cast in place.

[0036] See Figure 5 The support member 7.1 is streamlined in the direction of flue gas flow in order to reduce the flow resistance of high-temperature flue gas in the flue and at the same time reduce the scouring of the support member surface by the flue gas, thereby increasing the service life of the support member.

[0037] Preferably, both the outer wall 4.1 and the inner wall 4.2 are constructed from bottom to top using standard bricks. When constructing the outer wall 4.1 and the inner wall 4.2, bases 7.2 are embedded in corresponding positions. The height H of the base 7.2 is an integer multiple of the height of the standard brick, which can effectively reduce the difficulty and workload of on-site brick cutting.

[0038] Preferably, the bottom surface of the inner wall 4.2 rests on the furnace shell 1, and the furnace shell 1 provides vertical support for the inner wall; furthermore, heavy high-alumina bricks are provided between the outer bottom of the inner wall 4.2 and the refractory lining of the combustion chamber 3, and the location of the heavy high-alumina bricks is the bottom refractory lining of the flue (i.e., Figure 1 The gap at point B (within the dashed box) provides lateral support to the bottom of the inner wall.

[0039] See Figure 1 and Figure 2 Between the inner wall 4.2 and the outer wall 4.1, at least two sets of support components 7 are spaced apart in both the vertical and horizontal directions to provide multiple lateral supports for the inner wall 4.2, ensure uniform stress distribution, and enhance the structural strength and resistance to lateral forces of the inner wall.

[0040] Furthermore, the interior of the furnace chamber 2 is provided with an air guide wall 5, and the furnace chamber can be divided into a drying section, a preheating section, a roasting section, a homogenizing section, and a cooling section (cooling air is input for cooling); the furnace shell 1 is a steel structure, serving as the main load-bearing structure of the entire vertical furnace; for any aspects of the vertical furnace not described in detail in this embodiment, please refer to the prior art.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A side wall structure of a high-strength pellet shaft furnace, the shaft furnace comprising a furnace chamber (2) and a combustion chamber (3) inside a furnace shell (1), the combustion chamber (3) being located outside the furnace chamber (2) and communicating with each other through a flue (4), the flue (4) comprising an inner wall (4.2) located close to one side of the furnace chamber (2) and an outer wall (4.1) arranged against the furnace shell (1), characterized in that, A plurality of support assemblies (7) are arranged between the inner wall (4.2) and the outer wall (4.1) to transmit the lateral pressure received by the inner wall (4.2) to the furnace shell (1).

2. The side wall structure of a high-strength pellet shaft furnace according to claim 1, characterized by, The support assembly (7) comprises a support (7.1) and a base (7.2), and the base (7.2) is arranged in both the inner wall (4.2) and the outer wall (4.1), and the two ends of the support (7.1) are connected with the base (7.2) on the inner wall (4.2) and the base (7.2) on the outer wall (4.1) respectively.

3. The side wall structure of a high-strength pellet shaft furnace according to claim 2, wherein The support (7.1) and the base (7.2) are connected by a convex and concave structure.

4. The side wall structure of a high-strength pellet shaft furnace according to claim 3, wherein The gap between the support (7.1) and the base (7.2) is filled with a ceramic fiber blanket.

5. The side wall structure of a high-strength pellet shaft furnace according to claim 2, wherein The support (7.1) and the base (7.2) are internally provided with a steel reinforcement (7.3).

6. The side wall structure of a high-strength pellet shaft furnace according to claim 5, wherein The support (7.1) and the base (7.2) are made of high-alumina refractory material.

7. The side wall structure of a high-strength pellet shaft furnace according to claim 2, wherein The support (7.1) is streamlined in the direction of the flue gas flow.

8. The side wall structure of a high-strength pellet shaft furnace according to claim 2, wherein The outer wall (4.1) and the inner wall (4.2) are both built from standard bricks from bottom to top, and the base (7.2) is embedded in the outer wall (4.1) and the inner wall (4.2), and the height H of the base (7.2) is an integer multiple of the height of the standard brick.

9. The side wall structure of a high-strength pellet shaft furnace according to claim 1, wherein The bottom surface of the inner wall (4.2) is supported by the furnace shell (1), and heavy high-alumina bricks are arranged between the outer side of the bottom of the inner wall (4.2) and the refractory lining of the combustion chamber (3).

10. The side wall structure of a high-strength pellet shaft furnace according to claim 1, wherein The inner wall (4.2) and the outer wall (4.1) are both arranged with at least two groups of support assemblies (7) in the vertical and horizontal directions.

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