Environment-friendly full-closed smelting furnace flue gas purification gas flange sealing device

Abstract

The utility model discloses an environmental protection type full -closed gas flue flange sealing device of gas purification of ore heating furnace, include: sealed apron, detachable embrace setting in the sealed flange outside, wherein, set up insulating sealing filling layer between sealed apron inner wall and sealed flange outer wall.

Description

Technical Field

[0001] This utility model relates to the technical field of gas purification pipeline sealing devices, and in particular to an environmentally friendly fully enclosed flue gas purification flange sealing device for an electric arc furnace. Background Technology

[0002] Environmentally friendly fully enclosed submerged arc furnaces have gradually become widespread in the ferroalloy industry. Unlike semi-enclosed and open submerged arc furnaces, fully enclosed furnaces can further treat and recover the flue gas produced during alloy smelting and reuse it. Compared with other types of submerged arc furnaces, they have lower energy consumption, more advanced production processes, and less pollution to the environment. However, there are also many potential production hazards in the process of recovering and utilizing coal gas from flue gas. The most important of these is the system sealing issue. From the furnace body and flue gas pipelines to each purification process, the coal gas purification system must ensure the stability of the overall sealing performance. If poor sealing or flue gas leakage occurs, it may lead to excessive coal gas content in the area, posing a safety hazard to the workers in the area. In severe cases, it may lead to excessive oxygen content in the purification system, potentially causing a flash explosion at the purification stage. Therefore, the sealing problem of the coal gas purification system has a significant impact on the overall production of the environmentally friendly fully enclosed submerged arc furnace system.

[0003] Currently, due to terrain and plant layout factors, many factories use multi-stage flue gas pipelines for transportation. The sealing of the connecting flanges is a primary factor in ensuring stable production. Connecting flanges are typically sealed with bolts, gaskets, and sealant. However, with prolonged use, the temperature of the purified gas pipeline rises, and the sealant's effectiveness gradually decreases, potentially leading to poor sealing and flue gas leaks. This necessitates furnace shutdown for maintenance and resealing, which is costly in terms of manpower and resources and severely disrupts normal production. Currently, there are few sealing devices available that offer long-term stable sealing, or those that exist have poor operational flexibility and limitations, hindering widespread adoption. There is a lack of pipeline flange sealing devices with good sealing performance and flexible application. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an environmentally friendly, fully enclosed flue gas purification flange sealing device for submerged arc furnaces.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An environmentally friendly, fully enclosed flue gas purification device for an electric arc furnace includes:

[0007] A removable, circumferential sealing plate is mounted on the outside of the sealing flange.

[0008] An insulating and sealing filler layer is provided between the inner wall of the sealing guard plate and the outer wall of the sealing flange.

[0009] The sealing plate consists of two arc-shaped structures, which are connected by fastening bolts to form a cylindrical structure.

[0010] The bottom of the cylindrical structure is provided with an annular plate that can fit tightly against the outer wall of the flue gas duct.

[0011] The beneficial effects of this utility model are as follows: This utility model adds a secondary sealing device to the existing flange sealant, protecting the original sealing device while enhancing the sealing effect at the flange connection of the flue gas duct. This effectively reduces the possibility of sealing failure in key areas where flue gas leaks, thus reducing safety hazards in the working environment. By using small-particle solid filler, the insulation effect of the device is enhanced while ensuring the system's sealing performance, reducing safety hazards for operators. This device can be installed or disassembled for maintenance without shutting down the furnace, increasing the operational flexibility of the sealing device and greatly ensuring the stability of normal production. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the sealing plate of this utility model. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0015] like Figure 1 and Figure 2 As shown, an environmentally friendly, fully enclosed flue gas duct sealing device for an electric arc furnace includes: a sealing plate 1, detachably and surrounding the outside of a sealing flange 4; wherein an insulating and sealing filling layer 3 is provided between the inner wall of the sealing plate 1 and the outer wall of the sealing flange 4. The sealing plate 1 is composed of two arc-shaped structures, which are connected by connecting bolts 2 to form a cylindrical structure. An annular plate is provided at the bottom of the cylindrical structure to fit tightly against the outer wall of the flue gas duct 5.

[0016] The sealing plate 1 of this utility model is made of 3mm thick steel plate, and is used in two halves in a cylindrical shape. An annular plate is made at the bottom end. The inner diameter of the annular plate is the same as the outer diameter of the flue gas duct 5, which can ensure that the sealing plate 1 fits tightly with the flue gas duct 5. A connecting bolt 2 is set at the connection of the two halves of the plate to effectively ensure the tight connection of the two halves of the plate and to ensure good sealing effect of the device. An insulating sealing filling layer 3 is set at the gap between the sealing plate 1 and the outer wall of the flue gas duct 5, which not only ensures the function of the original sealing device of the flange, but also increases its sealing effect and ensures the overall sealing performance of the system.

[0017] The height of the sealing plate 1 and the inner diameter of the annular plate are determined according to the specific production environment. The inner diameter of the annular plate depends on the outer diameter of the flue gas duct 5 and must be the same as the outer diameter of the flue gas duct 5. The height of the plate is determined according to the actual site conditions and must wrap around the flange connection to enhance its sealing performance.

[0018] After installation, this utility model can enclose the sealing flange 4. The two arc-shaped structures of the sealing guard plate 1 are connected by connecting fastening bolts 2, which effectively avoids the phenomenon of poor sealing effect due to misalignment. There is a gap between the sealing guard plate 1 and the purified flue gas pipe 5. After the sealing guard plate 1 is installed, quartz sand is filled into the gap to play a sealing and insulation role.

[0019] The advantages of this utility model are: reasonable structural design, convenient implementation, safe and reliable use, avoidance of delayed leakage caused by failure of the original sealing facilities, and effective protection of the original flange connection sealing device, providing double protection for the safety of the production operation environment.

[0020] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. An environmentally friendly, fully enclosed flue gas purification flange sealing device for a submerged arc furnace, characterized in that, include: A sealing guard plate (1) is detachably mounted on the outside of the sealing flange (4); An insulating sealing filler layer (3) is provided between the inner wall of the sealing guard plate (1) and the outer wall of the sealing flange (4).

2. The environmentally friendly fully enclosed flue gas purification flange sealing device for a submerged arc furnace according to claim 1, characterized in that: The sealing plate (1) consists of two arc-shaped structures, which are connected by connecting fastening bolts (2) to form a cylindrical structure.

3. The environmentally friendly fully enclosed flue gas purification flange sealing device for a submerged arc furnace according to claim 2, characterized in that: The bottom of the cylindrical structure is provided with an annular plate that can be closely attached to the outer wall of the flue gas duct (5).

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