An automatic coke removal device for alkali furnace tuyeres

Abstract

This utility model belongs to the technical field of chemical equipment and discloses an automatic coking removal device for alkali furnace tuyeres, comprising: a guide cylinder, the front end of which is connected to the flange of the alkali furnace tuyere; a cylinder end cap, which is fixedly connected to the rear end of the guide cylinder and coaxially arranged with the guide cylinder; a circular copper block, which is connected to the cylinder end cap by bolts and coaxially arranged with the cylinder end cap, and whose inner hole has an annular lubrication groove; a coking removal rod, which is slidably connected to the inner hole of the circular copper block and moves back and forth within the channel formed by the guide cylinder, the cylinder end cap, and the circular copper block; and a coking removal claw, which is installed at the end of the coking removal rod facing the alkali furnace tuyere and is used to extend into the tuyere of the alkali furnace to remove coke deposits. This utility model's automatic coking removal device for alkali furnace tuyeres replaces manual coking removal with mechanical automation, significantly improving the operational stability of the alkali furnace, reducing maintenance costs, and has high industrial application value.

Description

Technical Field

[0001] This utility model belongs to the technical field of chemical equipment, and in particular relates to an automatic coking removal device for alkali furnace tuyeres. It is suitable for the maintenance of tuyeres in high-temperature reaction equipment in industries such as pulp and paper making, metallurgy, and chemicals, and is especially suitable for cleaning coking deposits in the tuyeres of alkali recovery boilers. Background Technology

[0002] The alkali furnace is the core equipment of the alkali recovery system in the pulp and paper industry, used to burn black liquor and recover inorganic chemicals. During operation, coking (mainly inorganic salts and carbide deposits) easily forms in the tuyeres area due to high-temperature molten material and chemical reactions, leading to the following problems:

[0003] Blocked air vents: affect the uniformity of ventilation, reduce combustion efficiency, and increase energy consumption.

[0004] Disadvantages of manual descorching:

[0005] Safety risks: Manual operation requires entering a high-temperature environment, which poses occupational hazards such as burns and dust inhalation.

[0006] Incomplete cleaning: Manual cleaning is insufficient to completely remove coking deposits, which are prone to recurrence and affect the long-term stable operation of the equipment. Utility Model Content

[0007] Based on the shortcomings of the existing technology, the technical problem solved by this utility model is to provide an automated, efficient and safe automatic coking device for alkali furnace tuyeres. By replacing manual coking with mechanical automation, it significantly improves the operational stability of alkali furnaces, reduces maintenance costs, and has high industrial application value.

[0008] To solve the above-mentioned technical problems, this utility model provides an automatic coking removal device for alkali furnace tuyeres, comprising: a guide cylinder, the front end of which is connected to the flange of the alkali furnace tuyere; a cylinder end cap, which is fixedly connected to the rear end of the guide cylinder and coaxially arranged with the guide cylinder; a circular copper block, which is connected to the cylinder end cap by bolts and coaxially arranged with the cylinder end cap, and whose inner hole has an annular lubrication groove; a coking removal rod, which is slidably connected to the inner hole of the circular copper block and moves back and forth inside the channel formed by the guide cylinder, the cylinder end cap and the circular copper block; and a coking removal claw, which is installed at the end of the coking removal rod facing the alkali furnace tuyere and is used to extend into the tuyere of the alkali furnace to remove coking material.

[0009] Furthermore, the inner diameter of the circular copper block is smaller than the diameter of the central hole of the cylindrical end cap.

[0010] Furthermore, the edge of the central hole of the cylinder end cap is provided with a guide chamfer to prevent the descaling rod from swaying and rubbing.

[0011] Preferably, a high-temperature gasket is provided between the cylinder end cap and the circular copper block.

[0012] Optionally, the cylinder end cap is welded to the guide cylinder in the circumferential direction.

[0013] Furthermore, the annular lubrication groove has dimensions of 2mm wide and 1mm deep, and is filled with high-temperature grease.

[0014] Optionally, the cylinder end cap is provided with threaded holes that are threaded to the bolt and are evenly distributed in the circumferential direction, and the high-temperature gasket and the circular copper block are provided with through holes for the bolt to pass through and corresponding to the threaded holes.

[0015] Therefore, the automatic coke removal device for alkali furnace tuyeres of this utility model has at least the following beneficial effects:

[0016] 1. Automated and efficient coking removal: No manual intervention is required, reducing safety hazards, improving coking removal efficiency, ensuring complete removal of coking at the alkali furnace tuyeres, and reducing the recurrence of blockages.

[0017] 2. Precise and stable operation: The circular copper block support and self-lubricating design ensure smooth movement of the desiccant removal rod and prevent jamming.

[0018] 3. High temperature resistance and long service life: The round copper block and the high temperature resistant coke cleaning rod are adapted to the harsh environment of the alkali furnace, reducing the frequency of maintenance, reducing wear on moving parts, and improving service life.

[0019] 4. Easy maintenance: Modular structure design allows for quick replacement and repair of key components (such as round copper blocks), reducing downtime.

[0020] 5. Wide Applicability: Not only suitable for alkali furnace tuyeres, but also applicable to coking in high-temperature reaction equipment in metallurgy, chemical industry, and other sectors. By replacing manual coking with mechanized automation, it significantly improves the operational stability of alkali furnaces, reduces maintenance costs, and has high industrial application value.

[0021] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the invention more apparent and understandable, the following detailed description is provided in conjunction with preferred embodiments and accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0023] Figure 1 This is a schematic diagram of the automatic coke removal device for the alkali furnace tuyere of this utility model.

[0024] Figure 2 This is a schematic diagram of the structure of the circular copper block of this utility model.

[0025] In the diagram: 1-Guide cylinder; 2-Cylinder end cap; 3-High temperature gasket; 4-Circular copper block; 41-Annular lubrication groove; 5-Bolt; 6-Clearing rod. Detailed Implementation

[0026] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings, which form part of this specification. These embodiments illustrate the principles of the invention, and other aspects, features, and advantages of this utility model will become apparent from this detailed description. In the accompanying drawings, the same or similar parts in different figures are indicated by the same reference numerals.

[0027] like Figures 1 to 2 As shown, the automatic coke removal device for the alkali furnace tuyere of this utility model includes a guide cylinder 1, a cylinder end cap 2, a high-temperature gasket 3, a circular copper block 4, and a coke removal rod 6. The guide cylinder 1, serving as the main frame of the device, is made of high-temperature resistant stainless steel. The front end of the guide cylinder 1 is connected to the flange of the alkali furnace tuyere, and its rear end is equipped with a detachable end cap structure.

[0028] The cylinder end cap 2 is fixedly connected to the rear end of the guide cylinder 1 and is coaxially arranged with the guide cylinder 1. Specifically, the cylinder end cap 2 and the guide cylinder 1 are welded together in the circumferential direction to form a closed structure.

[0029] The circular copper block 4 is connected to the cylinder end cap 2 by bolts 5 and is coaxially arranged with the cylinder end cap 2. The inner hole of the circular copper block 4 has an annular lubrication groove 41. The circular copper block 4 is the core support component, and its material is tin bronze (ZCuSn). 10 Zn2) or copper-based graphite composite material (containing 15%-20% graphite). The annular lubrication groove 41 inside the circular copper block 4 has dimensions of 2mm wide × 1mm deep, and the interior of the annular lubrication groove 41 is filled with high-temperature grease (such as molybdenum disulfide).

[0030] The high-temperature gasket 3 is made of graphite metal composite material and is installed between the cylinder end cap 2 and the circular copper block 4 to achieve high-temperature sealing (temperature resistance ≥600℃). It also has a stress buffering function to prevent the circular copper block 4 from deforming due to bolt preload.

[0031] Bolt 5 is made of A2-70 stainless steel, and a high-temperature anti-seize agent (nickel-based paste) is applied to the threaded part. In this utility model, four bolts 5 are evenly distributed, and the preload is controlled at 25-30 N·m to ensure sealing while preventing the circular copper block 4 from being crushed. The cylinder end cap 2 has four threaded holes that are evenly distributed in the circumferential direction and are threaded to connect with the bolts 5. The high-temperature gasket 3 and the circular copper block 4 have through holes for the bolts 5 to pass through and that correspond to the threaded holes.

[0032] The coke-clearing rod 6 is slidably connected to the inner hole of the circular copper block 4, and moves back and forth inside the channel formed by the guide cylinder 1, the cylinder end cap 2, and the circular copper block 4. The circular copper block 4 and the coke-clearing rod 6 are clearance-fitted (H8 / f7) to ensure smooth movement and no radial wobble.

[0033] The coking claw is installed at the end of the coking rod 6 facing the alkali furnace tuyeres, and is used to extend into the tuyeres of the alkali furnace to remove coking deposits. The coking claw is made of high-temperature resistant stainless steel. During boiler operation, persistent coking is prone to occur at the alkali furnace tuyeres, requiring regular inspections and manual cleaning, which involves high frequency of work and a harsh working environment. This invention uses an automatic control system to drive the coking rod 6, which in turn drives the high-temperature resistant coking claw to perform reciprocating coking removal operations at a set frequency of 20-30 minutes per cycle. During the forward stroke, the coking claw precisely extends into the interior of the alkali furnace tuyeres, thoroughly removing coking deposits through efficient scraping. During the return stroke, it automatically retracts to its original position, achieving fully automated operation and completely eliminating the need for manual intervention.

[0034] In addition, the diameter of the central hole of the cylinder end cap 2 is designed to be slightly larger than the inner diameter of the circular copper block 4, so as to isolate the mechanical path of the coke-clearing rod 6 (only the circular copper block bears the weight). The edge of the central hole of the cylinder end cap 2 is machined with a 15° guide chamfer to prevent the coke-clearing rod 6 from swaying and rubbing.

[0035] The composite lubrication system adopted in this invention features a circular copper block that self-lubricates (material properties), forced lubrication (lubrication groove structure), and a graphite bushing (material properties). This triple friction reduction design ensures that the coefficient of friction is ≤0.12 (400℃ operating condition).

[0036] The circular copper block 4 and the descaling rod 6 of this utility model form an independent quick maintenance module. When disassembling, it can be pulled out axially by simply loosening the bolt 5, and the replacement time is less than 15 minutes.

[0037] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A device for automatic decoking of a coke oven mouth of a basic furnace, characterized in that, include: The guide cylinder (1) is connected at its front end to the flange of the alkali furnace tuyeres; The cylinder end cap (2) is fixedly connected to the rear end of the guide cylinder (1) and is coaxially arranged with the guide cylinder (1); A circular copper block (4) is connected to the end cap (2) of the cylinder by bolts (5) and is coaxially arranged with the end cap (2). Its inner hole has an annular lubrication groove (41). The slag removal rod (6) is slidably connected to the inner hole of the circular copper block (4) and moves back and forth inside the channel formed by the guide cylinder (1), the cylinder end cap (2) and the circular copper block (4); The coke removal claw is installed at the end of the coke removal rod (6) facing the alkali furnace tuyeres and is used to extend into the tuyeres of the alkali furnace to remove coke deposits.

2. The automatic coke removing device for the alkali furnace according to claim 1, characterized in that, The inner diameter of the circular copper block (4) is smaller than the diameter of the central hole of the cylindrical end cap (2).

3. The automatic coke removing device for the alkali furnace according to claim 1, characterized in that, The edge of the central hole of the cylinder end cap (2) is provided with a guide chamfer to prevent the descaling rod (6) from swaying and rubbing.

4. The automatic coke removing device for the alkali furnace according to claim 1, characterized in that, A high-temperature gasket (3) is provided between the cylinder end cap (2) and the circular copper block (4).

5. The automatic coke removing device for the alkali furnace according to claim 1, characterized in that, The end cap (2) of the cylinder is welded to the guide cylinder (1) in the circumferential direction.

6. The automatic coke removing device for the alkali furnace according to claim 1, characterized in that, The annular lubrication groove (41) has dimensions of 2mm wide and 1mm deep, and is filled with high-temperature grease.

7. The automatic coke removing device for the alkali furnace according to claim 4, characterized in that, The cylinder end cap (2) is provided with threaded holes that are threaded to the bolt (5) and are evenly distributed in the circumferential direction. The high temperature gasket (3) and the circular copper block (4) are provided with through holes that allow the bolt (5) to pass through and that correspond to the threaded holes.

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