Processing method for air leakage and powder leakage of blast furnace pulverizing mill body during grinding through

Abstract

The invention belongs to the technical field of blast furnace pulverizing mills, and relates to a blast furnace pulverizing mill body wear-through air leakage and powder leakage treatment method. An inner side vertical part (2) is welded to each side of a grinding-through part of a blast furnace powder mill body (1), outer side arc-shaped plates (3) are welded to the outer sides of the inner side vertical parts (2) on the two sides, the inner side vertical parts (2), the outer side arc-shaped plates (3) and the blast furnace powder mill body (1) form a cavity (5), and the lower ends of the inner side vertical parts (2) and the lower ends of the outer side arc-shaped plates (3) are connected with body flange plates (7); and a ceramic wear-resistant material stirred with water is poured into a cavity (5) formed by the inner side vertical piece (1), the outer side arc-shaped plate piece (2) and the blast furnace pulverizing mill body (1). According to the treatment method for air leakage and powder leakage of the blast furnace pulverizing mill body after grinding through, the grinding through part of the blast furnace pulverizing mill body can be conveniently and rapidly repaired, the overall air tightness and the structural strength are ensured, the powder leakage and air leakage phenomena are completely eradicated, and meanwhile a sealing part is made of a wear-resistant material and is durable.

Description

Technical Field

[0001] The present invention belongs to the technical field of blast furnace coal grinding mills, and more specifically, it relates to a method for dealing with air leakage and powder leakage caused by wear-through of the main body of a blast furnace coal grinding mill. Background Technique

[0002] When the ZGM type mill is in production, the drying gas enters the mill air duct from below and carries the pulverized coal to run upward. If the air flow generates deviation, the mixed gas rises close to the edge, and the powder gas contacts the main body of the mill for a long time, which will wear through the lower end of the main body of the mill. After wear-through, the mill operates under negative pressure, sucking in a large amount of cold air, resulting in an increase in oxygen content and affecting the safe working environment of the system. At the same time, if positive pressure is generated inside the mill, the powder gas mixture overflows through the worn part, causing environmental pollution and increasing the cleaning workload of employees.

[0003] There is a technology with the name of "a system for preparing blast furnace slag micro-powder and purifying hot blast stove flue gas", and the publication (announcement) number is "CN117125914A" in the prior art. This technology relates to the field of resource recycling. The system for preparing blast furnace slag micro-powder and purifying hot blast stove flue gas includes a raw material bin, a belt conveyor for transporting blast furnace slag to the raw material bin, a vertical pulverizer for grinding the blast furnace slag, a slag metering feeder for transporting the materials in the raw material bin to the vertical pulverizer, a hot blast stove flue gas pipeline for transporting the flue gas of the blast furnace hot blast stove into the vertical pulverizer, a bag filter for receiving the grinding products of the vertical pulverizer, a fine powder bin, a fine powder conveying device for transporting the fine powder collected by the bag filter to the fine powder bin, a chimney, a smoke exhaust pipe for transporting the flue gas purified by the bag filter to the chimney, and an induced draft fan for pressurizing the flue gas in the smoke exhaust pipe. The system for preparing blast furnace slag micro-powder and purifying hot blast stove flue gas uses the flue gas of the blast furnace hot blast stove to dry the blast furnace slag micro-powder and uses the blast furnace slag micro-powder to desulfurize the flue gas of the hot blast stove, saving energy consumption and reducing carbon emissions.

[0004] However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: aiming at the deficiencies of the prior art, to provide a method for dealing with air leakage and powder leakage caused by wear-through of the main body of a blast furnace coal grinding mill, which has simple steps, can conveniently and quickly complete the repair of the worn part of the main body of the blast furnace coal grinding mill, ensure the overall airtightness and structural strength, eliminate the phenomenon of powder leakage and air leakage, improve the working environment, reduce the labor intensity, ensure the safe and efficient production of the mill, and at the same time, the sealing components use wear-resistant materials, with a long service life and durability.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0007] The present invention is a method for dealing with air leakage and powder leakage caused by wear-through of the main body of a blast furnace coal grinding mill. The treatment steps of the method for dealing with air leakage and powder leakage caused by wear-through of the main body of the blast furnace coal grinding mill are as follows:

[0008] S1. Detect the height and width dimensions of the worn part of the main body of the blast furnace coal pulverizing mill;

[0009] S2. Fabricate a closing component, which includes an inner vertical member and an outer arc-shaped plate. The length and width of the outer arc-shaped plate are more than twice the size of the worn part;

[0010] S3. Weld the inner vertical members on each side of the worn part of the main body of the blast furnace coal pulverizing mill, and weld the outer arc-shaped plates on the outer sides of the inner vertical members on both sides. A cavity is formed between the inner vertical members, the outer arc-shaped plates and the main body of the blast furnace coal pulverizing mill. The lower ends of the inner vertical members and the lower ends of the outer arc-shaped plates are respectively connected to the main body flange;

[0011] S4. Stir the ceramic wear-resistant material with water, and pour the ceramic wear-resistant material stirred with water into the cavity formed by the inner vertical members, the outer arc-shaped plate members and the main body of the blast furnace coal pulverizing mill;

[0012] S5. After pouring, the temperature of the main body of the blast furnace coal pulverizing mill dries the wear-resistant casting material, and the main body of the blast furnace coal pulverizing mill starts up to resume normal production.

[0013] The worn part of the main body of the blast furnace coal pulverizing mill is located at the part of the flange near the lower end of the main body of the blast furnace coal pulverizing mill.

[0014] The outer arc-shaped plate is an outwardly convex arc-shaped plate member, and the edges on each side of the outer arc-shaped plate are set to be conical structures.

[0015] The inner vertical plate is formed by welding one or more plate members, and the outer arc-shaped plate is formed by welding one or more arc-shaped plate members.

[0016] Reinforcing ribs are welded on the inner surface of the outer arc-shaped member, and reinforcing bars are welded between the inner surface of the outer arc-shaped member and the main body of the blast furnace coal pulverizing mill.

[0017] When pouring the ceramic wear-resistant material stirred with water into the cavity formed by the inner vertical members, the outer arc-shaped plate members and the main body of the blast furnace coal pulverizing mill, the ceramic wear-resistant material is poured to a position 15 mm - 20 mm from the upper end edge of the cavity.

[0018] The inner vertical plate includes a first inner vertical plate and a second inner vertical plate, and flange plates are respectively welded at the bottoms of the first inner vertical plate and the second inner vertical plate.

[0019] The radius of the outer arc-shaped plate in the horizontal direction is the same as the radius of the outer surface of the main body of the blast furnace coal pulverizing mill.

[0020] Multiple groups of closing components are arranged on the outer surface of the main body of the blast furnace coal pulverizing mill, and each group of closing components respectively includes an inner vertical member and an outer arc-shaped plate.

[0021] The composition of the ceramic wear-resistant material includes wear-resistant aggregate, nano metal micro-powder, inorganic cementing material and special additives. The wear-resistant aggregate usually adopts ceramic particles of high hardness, such as alumina (Al2O 3) or silicon carbide (SiC); the nano metal micro-powder is metal powder, the inorganic cementing material is portland cement or phosphate, and the special additives are dispersant or anti-cracking agent.

[0022] Adopting the technical solution of the present invention, the working principle and beneficial effects are as follows:

[0023] For the method for treating the wear-through, air leakage and powder leakage of the main body of the blast furnace coal mill of the present invention, in order to ensure the normal operation of the mill, without replacing the mill, it is necessary to repair the worn part of the main body of the mill in a large range. Therefore, on the one hand, a sealing component is made. The sealing component includes an inner vertical member and an outer arc-shaped plate. Then, the inner vertical members are welded on each side of the worn part of the main body of the blast furnace coal mill. The inner vertical members are vertically arranged. Then, the outer arc-shaped plates are welded on the outer sides of the inner vertical members on both sides. Each side edge of the outer arc-shaped plate is welded and connected to an inner vertical member. The outer arc-shaped plate does not directly contact the outer surface of the main body of the blast furnace coal mill. In this way, a cavity is formed between the inner vertical member, the outer arc-shaped plate and the main body of the blast furnace coal mill. The inner vertical member, the outer arc-shaped plate and the main body of the blast furnace coal mill are convenient to weld. After welding and connection, the overall strength is good and it is not easy to fall off. The welding construction is simple and fast. On the other hand, the ceramic wear-resistant material is stirred with water, and the ceramic wear-resistant material stirred with water is poured into the cavity formed by the inner vertical member, the outer arc-shaped plate member and the main body of the blast furnace coal mill. After the ceramic wear-resistant material is dried, a shielding member is reliably formed, which effectively prevents air leakage and powder leakage at the worn part, ensuring that the blast furnace coal mill can continue to operate only through repair without replacement, reducing the equipment investment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following briefly describes the content expressed by each drawing in this specification and the marks in the drawings:

[0025] Figure 1 is a schematic structural diagram of the main body of the blast furnace coal mill of the present invention;

[0026] Figure 2 is a schematic structural diagram of the main body of the blast furnace coal mill of the present invention;

[0027] Figure 3 is a schematic structural diagram of the main body of the blast furnace coal mill of the present invention;

[0028] The marks in the drawings are respectively: 1. Main body of the blast furnace coal mill; 2. External plate member; 3. Internal plate member; 4. Reinforcing member; 5. Cavity; 6. Flange; 7. First inner vertical plate; 8. Second inner vertical plate; 9. Ceramic wear-resistant material block. DETAILED DESCRIPTION OF THE INVENTION

[0029] The following further describes in detail the specific implementation manners of the present invention, such as the shapes, structures of the components involved, the mutual positions and connection relationships between the various parts, the functions and working principles of the various parts, etc., with reference to the accompanying drawings and through the description of the embodiments:

[0030] As shown in the attached Figure 1 - attached Figure 3 drawings, the present invention is a method for treating air leakage and powder leakage caused by wear-through of the main body of a blast furnace coal pulverizing mill, and the treatment steps of the method for treating air leakage and powder leakage caused by wear-through of the main body of the blast furnace coal pulverizing mill are as follows:

[0031] S1. Detect the height and width dimensions of the worn part of the blast furnace coal pulverizing mill body 1; S2. Fabricate a sealing component, which includes an inner vertical member 2 and an outer arc-shaped plate 3, and the length and width of the outer arc-shaped plate 3 are more than twice the size of the worn part; S3. Weld the inner vertical member 2 on each side of the worn part of the blast furnace coal pulverizing mill body 1, and weld the outer arc-shaped plate 3 on the outside of the inner vertical members 2 on both sides. A cavity 5 is formed between the inner vertical member 2, the outer arc-shaped plate 3 and the blast furnace coal pulverizing mill body 1. The lower ends of the inner vertical member 2 and the outer arc-shaped plate 3 are respectively connected to the body flange 7; S4. Stir the ceramic wear-resistant material with water, and pour the ceramic wear-resistant material stirred with water into the cavity 5 formed by the inner vertical member 1, the outer arc-shaped plate member 2 and the blast furnace coal pulverizing mill body 1; S5. After pouring is completed, the temperature of the blast furnace coal pulverizing mill body 1 dries the wear-resistant casting material, and the blast furnace coal pulverizing mill body 1 is started up to resume normal production. In the above steps, during the operation of the mill, wear will occur near the flange 6 at the lower part of the mill, forming a worn part, and the worn part generally consists of multiple holes of different sizes. To ensure the normal operation of the mill, without replacing the mill, it is necessary to repair the worn part of the mill body in a large range. For this purpose, on the one hand, fabricate a sealing component, which includes an inner vertical member 2 and an outer arc-shaped plate 3, and then weld the inner vertical member 2 on each side of the worn part of the blast furnace coal pulverizing mill body 1. The inner vertical member 2 is vertically arranged, and then weld the outer arc-shaped plate 3 on the outside of the inner vertical members 2 on both sides. Each side edge of the outer arc-shaped plate 3 is welded and connected to an inner vertical member 2. The outer arc-shaped plate 3 does not directly contact the outer surface of the blast furnace coal pulverizing mill body 1. In this way, a cavity 5 is formed between the inner vertical member 2, the outer arc-shaped plate 3 and the blast furnace coal pulverizing mill body 1. The inner vertical member 2, the outer arc-shaped plate 3 and the blast furnace coal pulverizing mill body 1 are convenient to weld. After welding and connection, the overall strength is good and it is not easy to fall off. The welding construction is simple and fast; on the other hand, stir the ceramic wear-resistant material with water, and pour the ceramic wear-resistant material stirred with water into the cavity 5 formed by the inner vertical member 2, the outer arc-shaped plate member 3 and the blast furnace coal pulverizing mill body 1. After the ceramic wear-resistant material is dried, a shielding member can be reliably formed, effectively preventing air leakage and powder leakage at the worn part, ensuring that the blast furnace coal pulverizing mill can continue to operate only through repair without the need for replacement, reducing the equipment investment cost. The method for treating air leakage and powder leakage at the worn part of the blast furnace coal pulverizing mill body described in the present invention has simple steps, can conveniently and quickly repair the worn part of the blast furnace coal pulverizing mill body, ensure the overall airtightness and structural strength, eliminate the phenomenon of powder leakage and air leakage, improve the working environment, reduce the labor intensity, ensure the safe and efficient production of the mill. At the same time, the sealing component uses wear-resistant material, has a long service life and is durable.

[0032] The worn part of the blast furnace pulverizing mill body 1 is located at the part of the flange 6 near the lower end of the blast furnace pulverizing mill body 1. The outer arc plate 3 is a convex arc plate member, and the edge of each side of the outer arc plate 3 is set to be a conical structure. With the above structure, since the outer arc plate 3 is a convex arc plate member, it is ensured that after the outer arc plate 3 is welded, the outer arc plate 3 will not fit against the blast furnace pulverizing mill body 1, but there is a gap between the two, which is convenient for forming an inner cavity. The edge of each side of the outer arc plate 3 is set to be a conical structure, that is, a conical interface is formed for overall welding to ensure the flatness after the components are welded and effectively improve the welding quality.

[0033] The inner vertical plate 2 is formed by welding one or more plate members, and the outer arc plate 3 is formed by welding one or more arc plate members. With the above structure, according to the size of the worn part, the sizes of the inner vertical plate 2 and the outer arc plate 3 are selected to ensure reliable shielding of the worn part.

[0034] Reinforcing ribs are welded on the inner surface of the outer arc member 3, and reinforcing bars 4 are welded between the inner surface of the outer arc member 3 and the blast furnace pulverizing mill body 1. With the above structure, welding reinforcing ribs on the inner surface of the outer arc member 3 improves the strength of the outer arc member itself, and welding reinforcing bars 4 between the inner surface of the outer arc member 3 and the blast furnace pulverizing mill body 1 realizes the connection strength between the outer arc member and the blast furnace pulverizing mill body 1, ensuring the connection reliability of the closed component and preventing it from falling off easily.

[0035] When the ceramic wear-resistant material stirred with water is poured into the cavity 5 formed by the inner vertical member 1, the outer arc plate member 2 and the blast furnace pulverizing mill body 1, the ceramic wear-resistant material is poured to a position 15 mm - 20 mm away from the upper end edge of the cavity 5. With the above structure, pouring the ceramic wear-resistant material to a position 15 mm - 20 mm away from the upper end edge of the cavity 5 prevents the ceramic wear-resistant material from falling outwards.

[0036] The inner vertical plate 2 includes a first inner vertical plate 7 and a second inner vertical plate 8, and flanges 6 are respectively welded to the bottoms of the first inner vertical plate 7 and the second inner vertical plate 8. With the above structure, the lower part of the flange is connected to the air inlet channel, and flanges 6 are respectively welded to the bottoms of the first inner vertical plate 7 and the second inner vertical plate 8 to ensure the connection strength at the bottoms of the first inner vertical plate 7 and the second inner vertical plate 8. The lower end of the outer arc member 3 is welded with a flange 6 to form a shield for the bottom of the cavity through the flange. Thus, a cavity with only an upper opening is formed, and the upper part is used for pouring the ceramic wear-resistant material. After the poured ceramic wear-resistant material is dried, a ceramic wear-resistant material block 9 is formed to effectively block the worn part.

[0037] The radius of the outer arc plate 3 in the horizontal direction is the same as the radius of the outer surface of the blast furnace pulverizing mill body 1. With the above structure, it is ensured that after the outer arc plate 3 is welded, the outer arc plate 3 will not fit against the blast furnace pulverizing mill body 1, and there is a gap between the two, which is convenient for forming an inner cavity.

[0038] A plurality of sets of closed components are arranged on the outer surface of the blast furnace pulverizing mill body 1, and each set of closed components respectively includes an inner vertical member 2 and an outer arc-shaped plate 3. With the above structure, according to the actual wear-through situation of the blast furnace pulverizing mill body 1, a plurality of closed components can be arranged at different positions.

[0039] In the method of the present invention, the composition of the ceramic wear-resistant material includes wear-resistant aggregate, nano metal micro-powder, inorganic cementing material and special additive. The wear-resistant aggregate usually adopts high-hardness ceramic particles such as alumina (Al2O3) or silicon carbide (SiC); the nano metal micro-powder is metal powder, the inorganic cementing material is portland cement or phosphate, and the special additive is dispersant or anti-cracking agent. In the above steps, the wear-resistant aggregate usually adopts high-hardness ceramic particles such as alumina (Al2O3) and silicon carbide (SiC), and these particles can effectively resist material erosion and mechanical wear 1. The nano metal micro-powder enhances the overall strength and toughness of the coating material by filling the voids between the aggregates 1. Inorganic cementing materials such as portland cement and phosphate are the bonding basis of the coating material, ensuring that each component is closely combined to form a strong protective layer 1. Special additives such as dispersants and anti-cracking agents are used to improve the construction performance and long-term stability of the coating material.

[0040] In the method for treating air leakage and powder leakage caused by wear-through of the blast furnace pulverizing mill body of the present invention, in order to ensure the normal operation of the mill, without replacing the mill, it is necessary to repair the wear-through part of the mill body in a large range. On the one hand, make a closed component, which includes an inner vertical member 2 and an outer arc-shaped plate 3, and then weld the inner vertical member 2 on each side of the wear-through part of the blast furnace pulverizing mill body 1. The inner vertical member 2 is vertically arranged, and then weld the outer arc-shaped plate 3 on the outside of the inner vertical members 2 on both sides. Each side edge of the outer arc-shaped plate 3 is welded and connected to an inner vertical member 2, and the outer arc-shaped plate 3 does not directly contact the outer surface of the blast furnace pulverizing mill body 1. In this way, a cavity 5 is formed between the inner vertical member 2, the outer arc-shaped plate 3 and the blast furnace pulverizing mill body 1. The inner vertical member 2, the outer arc-shaped plate 3 and the blast furnace pulverizing mill body 1 are convenient to weld, and the overall strength is good after welding connection and is not easy to fall off, and the welding construction is simple and fast; on the other hand, stir the ceramic wear-resistant material with water, and pour the ceramic wear-resistant material stirred with water into the cavity 5 formed by the inner vertical member 2, the outer arc-shaped plate member 3 and the blast furnace pulverizing mill body 1. After the ceramic wear-resistant material is dried, a shielding member can be reliably formed to prevent air leakage and powder leakage at the wear-through part, ensuring that the blast furnace pulverizing mill can continue to operate only through repair without replacement, reducing the equipment investment cost.

[0041] The present invention has been described exemplarily in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method for treating air leakage and powder leakage caused by wear-through of the main body of a pulverizing mill in a blast furnace, characterized in that: The treatment steps of the method for treating air leakage and powder leakage caused by wear-through of the blast furnace pulverizing mill body are as follows: S1. Detect the height and width dimensions of the wear-through part of the blast furnace pulverizing mill body (1); S2. Fabricate a sealing component, which includes an inner vertical member (2) and an outer arc-shaped plate (3). The length and width of the outer arc-shaped plate (3) are more than twice that of the wear-through part; S3. Weld the inner vertical members (2) on each side of the wear-through part of the blast furnace pulverizing mill body (1), and weld the outer arc-shaped plates (3) on the outer sides of the inner vertical members (2) on both sides. A cavity (5) is formed between the inner vertical members (2), the outer arc-shaped plates (3) and the blast furnace pulverizing mill body (1). The lower ends of the inner vertical members (2) and the lower ends of the outer arc-shaped plates (3) are respectively connected to the body flange (7); S4. Stir the ceramic wear-resistant material with water, and pour the ceramic wear-resistant material stirred with water into the cavity (5) formed by the inner vertical member (1), the outer arc-shaped plate member (2) and the blast furnace pulverizing mill body (1); S5. After pouring is completed, use the temperature of the blast furnace pulverizing mill body (1) to dry the wear-resistant castable, and start the blast furnace pulverizing mill body (1) to resume normal production.

2. The method for treating the wear-through, air leakage and powder leakage of the main body of the blast furnace coal mill according to claim 1, characterized in that: The wear-through part of the blast furnace pulverizing mill body (1) is located at the part of the blast furnace pulverizing mill body (1) close to the flange (6) at the lower end; 3. The method for treating the wear-through, air leakage and powder leakage of the main body of the blast furnace coal mill according to claim 1 or 2, characterized in that: The outer arc-shaped plate (3) is an outwardly convex arc-shaped plate member, and the edges on each side of the outer arc-shaped plate (3) are set to be conical structures; 4. The method for treating air leakage and powder leakage caused by wear-through of the main body of the blast furnace coal mill according to claim 1 or 2, characterized in that: The inner vertical plate (2) is formed by welding one or more plate members, and the outer arc-shaped plate (3) is formed by welding one or more arc-shaped plate members; 5. The method for treating the wear-through, air leakage and powder leakage of the main body of the blast furnace coal mill according to claim 1 or 2, characterized in that: Reinforcing ribs are welded on the inner surface of the outer arc-shaped member (3), and reinforcing rods (4) are welded between the inner surface of the outer arc-shaped member (3) and the blast furnace pulverizing mill body (1); 6. The method for treating air leakage and powder leakage caused by wear-through of the main body of the pulverizing mill in the blast furnace according to claim 1 or 2, characterized in that: When pouring the ceramic wear-resistant material stirred with water into the cavity (5) formed by the inner vertical member (1), the outer arc-shaped plate member (2) and the blast furnace pulverizing mill body (1), the ceramic wear-resistant material is poured to a position 15 mm - 20 mm from the upper end edge of the cavity (5); 7. The method for treating air leakage and powder leakage caused by wear-through of the main body of the blast furnace coal mill according to claim 2, characterized in that: The inner vertical plate (2) includes a first inner vertical plate (7) and a second inner vertical plate (8), and flanges (6) are respectively welded to the bottoms of the first inner vertical plate (7) and the second inner vertical plate (8); 8. The method for treating the wear-through, air leakage and powder leakage of the main body of the blast furnace coal mill according to claim 1 or 2, characterized in that: The radius of the outer arc-shaped plate (3) in the horizontal direction is the same as the radius of the outer surface of the blast furnace pulverizing mill body (1); 9. The method for treating the wear-through, air leakage and powder leakage of the blast furnace coal grinding mill body according to claim 1 or 2, characterized in that: Multiple groups of sealing components are arranged on the outer surface of the blast furnace pulverizing mill body (1), and each group of sealing components respectively includes an inner vertical member (2) and an outer arc-shaped plate (3); 10. The method for treating the wear-through, air leakage and powder leakage of the main body of the blast furnace coal mill according to claim 1 or 2, characterized in that: The composition of the ceramic wear-resistant material includes wear-resistant aggregate, nano metal micro-powder, inorganic cementing material and special additives. The wear-resistant aggregate usually adopts high-hardness ceramic particles alumina (Al2O3) or silicon carbide (SiC); the nano metal micro-powder is metal powder, the inorganic cementing material is portland cement or phosphate, and the special additives are dispersants or anti-cracking agents.

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