Converter tapping hole maintenance anti-blocking fettling method

Abstract

The invention discloses an anti-blocking fettling method for maintaining a tapping hole of a converter, which comprises the following steps of: after deslagging of the converter is finished, adjusting the angle of a converter mouth, and pouring fettling sand into the converter; the converter is shaken to a furnace rear operation position, and a steel pipe is inserted into the converter from the outside of the converter through a tapping hole; a converter sliding plate clamp is used for clamping and fixing the steel pipe; and slowly tilting the converter to enable the fettling sand to flow along the wall of the converter, gathering the fettling sand blocked by the steel pipe, enabling the fettling sand to flow into an annular gap or a damaged pit between the large brick at the tapping hole and the surrounding refractory material until the fettling sand is filled and leveled up, loosening the sliding plate clamp, taking out the steel pipe, and completing fettling. The problem that the tapping hole is blocked in the fettling process is fundamentally solved, the fettling sand is accurately guided and limited in a specific area needing to be repaired, the fettling effect and the material utilization rate are greatly improved, the operation safety and efficiency are improved, and the device is simple, low in cost and beneficial to large-scale application and popularization in iron and steel enterprises.

Description

Technical Field

[0001] This invention relates to the field of steelmaking technology in iron and steel metallurgy, specifically to a method for maintaining the tapping spout of a converter, and more particularly to a method for repairing the converter tapping spout to prevent blockage. Background Technology

[0002] The converter is the core equipment in steel smelting, and the tapping spout is its key component. During the smelting process, the refractory lining of the tapping spout is subjected to chemical erosion and mechanical scouring by high-temperature molten steel and slag for a long time, making it extremely susceptible to damage. In particular, at the joint between the large brick of the tapping spout and the surrounding refractory material, pits or gaps are easily formed, affecting the service life of the tapping spout and safe production.

[0003] In existing technologies, the taphole is typically maintained by adding repair sand, such as magnesia, after slag removal. However, traditional repair methods have the following significant drawbacks: Risk of clogging: After the furnace filler sand is added, the highly fluid sand can easily flow directly into the internal channel of the taphole during furnace shaking or tilting, causing severe blockage. Once blocked, an oxygen lance must be used to clear the blockage, which is not only difficult and dangerous, but will also further damage the refractory material at the taphole and shorten its lifespan.

[0004] Poor precision in sand filling: Traditional methods struggle to accurately fill the specific locations requiring repair with sand, such as the gaps or pits between the taphole brick and the surrounding refractory material. Large amounts of sand flow into other parts of the furnace or into the taphole, resulting in poor repair effectiveness and significant material waste.

[0005] Low operational safety: Operators need to perform tasks such as packing in the high-temperature area behind the furnace, which involves high labor intensity and high risk of heat radiation.

[0006] Therefore, there is an urgent need in this field for a method and apparatus for repairing the converter taphole that can effectively prevent blockage, achieve precise filling, and improve operational safety. Summary of the Invention

[0007] The primary objective of this invention is to ensure that during the furnace repair process, the repair sand will never flow into and block the internal channels of the taphole. The second objective is to ensure that the repair sand accurately and fully fills the target gap between the taphole brick and the surrounding refractory material. The third objective is to simplify the operation process and reduce the labor intensity and risks for operators. To overcome the shortcomings of the prior art, a furnace repair method for preventing blockage at the converter taphole is provided.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for maintaining and preventing blockage at the tapping opening of a converter is disclosed. The method comprises: after the slag is removed from the converter, adjusting the opening angle and pouring repair sand into the converter; shaking the converter to the rear working position and inserting a steel pipe from the outside of the converter into the converter through the tapping opening; using a converter sliding plate clamp to hold and fix the steel pipe; slowly tilting the converter to allow the repair sand to flow along the furnace wall, and the repair sand blocked by the steel pipe gathers and flows into the annular gap or damaged pit between the tapping opening brick and the surrounding refractory material until it is filled; releasing the sliding plate clamp and removing the steel pipe to complete the repair.

[0009] Furthermore, the steel pipe is a high-temperature resistant seamless metal steel pipe.

[0010] Furthermore, the steel pipe is inserted into the converter at the following specific positions: one end extends 50mm beyond the outer sliding plate of the sliding plate clamp, and the other end protrudes beyond the refractory material end face outside the steel outlet.

[0011] The beneficial effects of this invention are: 1. Fundamentally prevents blockage: By inserting a protruding steel pipe, the path of the furnace repair sand flowing into the internal channel of the steel tapping hole is physically blocked, fundamentally solving the long-standing technical problem of steel tapping hole blockage during the furnace repair process.

[0012] 2. Precise filling and material saving: This method uses steel pipes as baffles and guide plates to precisely guide and confine the furnace sand to the joint between the large bricks and refractory materials in the specific area that needs to be repaired, avoiding material waste and greatly improving the furnace repair effect and material utilization rate.

[0013] 3. Improved operational safety and efficiency: The entire operation process is simple and quick. Operators only need to complete a few simple actions such as "inserting the tube, clamping it, and removing it," eliminating the need for complex packing operations in a high-temperature environment. This significantly reduces labor intensity and safety hazards, shortens maintenance time, and increases the converter's operating rate.

[0014] 4. Simple equipment and low cost: The equipment used is only ordinary steel pipe and converter sliding plate slag blocking mechanism. The manufacturing and maintenance costs are extremely low, which is very conducive to its widespread use in steel enterprises. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the anti-clogging device for maintaining the converter tapping outlet of the present invention; Figure 2 This is a schematic diagram of the skateboard clamp structure of the present invention; The labels in the diagram are as follows: 1-The pit in the large brick needs to be filled, 2-Steel pipe, 3-Slide clamp, 4-Inner slide, 5-Outer slide, 6-Steel outlet. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to embodiments, such as... Figure 1 As shown, after the converter slag is discharged, the temperature inside the furnace is still relatively high. The operator remotely controls the converter to move to the working position behind the furnace.

[0017] Prepare a seamless steel pipe 2 with a diameter of 120-170mm and a length approximately 300-500mm longer than the total length of the steel outlet. The operator uses a long-handled tool to insert the steel pipe 2 into the outer end face of the steel outlet until its rear end protrudes 50mm beyond the outer sliding plate 5. At this point, the rear end of the steel pipe 2 will inevitably protrude 300-500mm beyond the refractory material of the steel outlet.

[0018] Then, the operator uses a handheld device to remotely control, such as Figure 2 The slide clamp 3 shown can lock and fix the steel pipe 2 firmly by slowly closing the inner slide 4 to lock the protruding steel pipe 2 using the lever principle.

[0019] After confirming the locking, the operator slowly tilts the converter through the control room. The magnesia sand fed from the scrap steel trough flows along the furnace wall to the tapping area. The magnesia sand is effectively blocked by the steel pipe 2 and cannot enter the internal channel of the tapping. Instead, it gathers around the steel pipe 2 and, under the action of gravity, flows precisely into and fills the large brick pit 1 that needs to be filled at the tapping.

[0020] After observing and confirming that the gaps have been filled and leveled, sinter for 10-20 minutes, tilt the converter to the rear area, open the slide clamp 3, release the steel pipe 2, remove it, and the furnace repair operation is completed. The converter can then be restored to an upright standby state.

[0021] This invention proposes an efficient and low-cost solution to the problem of melting loss in large bricks at the steel tapping outlet, and has the following advantages for widespread application: 1. High applicability: Applicable to the maintenance of the tapping port of most steelmaking converters, without the need to modify existing equipment.

[0022] 2. Significant effect: The service life of the tapping spout is significantly improved after repair, which can directly reduce the consumption of refractory materials and production downtime losses.

[0023] 3. Simple to operate: easy to master and implement, suitable for promotion and use in various steelmaking plants.

[0024] 4. It is expected that this invention will have broad application prospects in the steel industry, and can bring significant economic benefits and process optimization space to steelmaking enterprises.

[0025] The above content is only used to illustrate the technical solution of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A method for preventing blockage at the tapping spout of a converter, characterized in that: The method is as follows: After the converter slag is discharged, adjust the furnace opening angle and pour the repair sand into the converter; shake the converter to the rear working position and insert a steel pipe from the outside of the converter into the converter through the tap hole; use the converter sliding plate clamp to clamp and fix the steel pipe; slowly tilt the converter to allow the repair sand to flow along the furnace wall. The repair sand blocked by the steel pipe will gather and flow into the annular gap or damaged pit between the tap hole brick and the surrounding refractory material until it is filled. Release the sliding plate clamp, take out the steel pipe, and the repair is completed.

2. The furnace repair method for preventing blockage at the converter tapping outlet according to claim 1, characterized in that: The steel pipe is a high-temperature resistant seamless metal steel pipe.

3. The furnace repair method for preventing blockage at the converter tapping outlet according to claim 1, characterized in that: The steel pipe is inserted into the converter at the following position: one end extends 50mm beyond the outer sliding plate of the sliding plate clamp, and the other end protrudes from the refractory material end face outside the steel outlet.

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