A side-blowing gun body installation method and side-blowing gun body structure for a steel smelting furnace

Abstract

The present invention belongs to the field of steel smelting technology for a side-blowing gun body installation method for a steel smelting furnace. The installation steps of the side-blowing gun body installation method for a steel smelting furnace are as follows: a hole penetrating the furnace wall is reserved at the side-blowing gun body installation portion of the furnace wall; refractory mud is filled into the hole, and the refractory mud fills the entire hole; the furnace body refractory material, especially the refractory mud at the side-blowing oxygen gun installation portion, is fully sintered; the installation guide rod is used to clear the hole filled with refractory mud; refractory mud is applied on the surface of the side-blowing gun body; the gas source is connected to the side-blowing gun body, nitrogen is supplied to the center hole of the side-blowing gun body, and nitrogen is also supplied to the annular seam layer of the side-blowing gun body; the gun body is embedded in the hole. The side-blowing gun body installation method for a steel smelting furnace described in the present invention has simple steps, can conveniently and quickly realize the installation of the side-blowing gun body, ensure the installation quality, avoid major safety accidents such as penetration of steel or even penetration of the furnace, improve on-site operation safety, and protect the personal safety of on-site personnel.

Description

Technical Field

[0001] The invention belongs to the technical field of steel smelting, and more specifically relates to a method for installing a side-blowing gun body of a steel smelting furnace. Background Art

[0002] In the field of steel smelting technology, side-blowing oxygen lance oxygen supply is one of the important ways to achieve composite oxygen supply in modern electric arc furnaces. The side-blowing oxygen lance adopts a buried oxygen supply method. The lance is buried below the molten steel surface and directly contacts the molten steel to supply oxygen. This oxygen supply method improves the decarburization rate and enhances the stirring intensity of the molten pool, which can effectively improve the smelting rhythm. However, this oxygen supply method causes great loss of refractory materials around the lance body, and fast and safe lance loading and replacement is a technical difficulty in using the side-blowing oxygen supply method. The side-blowing oxygen lance is a buried oxygen supply lance installed below the molten steel surface on the side wall of the electric arc furnace and in direct contact with the molten steel. The lance body and the refractory materials in this part are subjected to long-term impact from the molten steel and the high-speed oxygen flow. It is the weakest part of the furnace body. If the lance body installation position is not handled properly, it is very easy to cause major safety accidents such as steel penetration or even furnace penetration. Therefore, safe and reliable installation of the side-blowing lance is an important guarantee for achieving safe production.

[0003] In the prior art, there is a technology named "composite furnace combining oxygen-enriched bottom blowing and side blowing" and publication number "115449589A", which includes a furnace body, a bottom oxygen lance socket, a side oxygen lance socket, a bottom oxygen lance and a side oxygen lance. A furnace cavity is built in the furnace body, and the furnace cavity includes a material melting zone and a metal precipitation zone distributed in a step-like manner. A concave precipitation trough is provided at the bottom surface of the metal precipitation zone; at least one bottom oxygen lance socket is opened on the furnace body corresponding to the material melting zone; at least one side oxygen lance socket is opened on the furnace body corresponding to the metal precipitation zone; the bottom oxygen lance is correspondingly assembled in the bottom oxygen lance socket; the side oxygen lance is correspondingly assembled in the side oxygen lance socket; the angle between the axial direction of the side oxygen lance socket and the vertical direction is greater than the angle between the axial direction of the bottom oxygen lance socket and the vertical direction.

[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: in view of the shortcomings of the existing technology, a method for installing a side-blowing gun body for a steel smelting furnace is provided, which has simple steps, can conveniently and quickly realize the installation of a side-blowing gun body, and ensure the installation quality, avoid major safety accidents such as penetration of steel or even penetration of the furnace, improve on-site operation safety, and protect the personal safety of on-site personnel.

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

[0007] The present invention provides a method for installing a side-blowing gun body of a steel smelting furnace. The installation steps of the method are as follows:

[0008] S1. During the refractory masonry process for a new steelmaking furnace, a hole is reserved through the furnace wall for the side-blowing lance installation area. The hole is filled with refractory mud until it completely fills the hole.

[0009] S2. When smelting the first heat of a new steelmaking furnace, do not install the side-blowing oxygen lance and conduct the smelting as if it were a new furnace. This allows the furnace refractory materials, especially the refractory clay where the side-blowing oxygen lance is installed, to be fully sintered. After the first heat of the new furnace is completed, drain the molten steel, leaving little or no molten steel in the furnace.

[0010] S3. Use the guide rod to unclog the hole filled with refractory mud. The diameter of the guide rod should be the same as that of the side-blowing lance, and the surface of the guide rod should be polished smooth to remove burrs and deflections. After the hole is unclogged, twist the end of the guide rod with a wrench to quickly remove it.

[0011] S4. Apply refractory mud on the surface of the side-blowing gun body; connect the gas source to the side-blowing gun body, supply nitrogen to the center hole of the side-blowing gun body, and also supply nitrogen to the annular seam layer of the side-blowing gun body;

[0012] S5. With nitrogen flowing throughout the process, insert the side-blowing gun head into the hole at the side-blowing gun installation location from the outside of the furnace wall, so that the gun body is embedded in the hole; until the side-blowing gun head passes through the installation hole and the gun head is exposed inside the furnace body, the installation of the side-blowing oxygen gun is completed.

[0013] After the installation of the side-blowing oxygen lance is completed, the material is fed and smelted, but the gas source of the side-blowing lance body is still supplied with nitrogen. After using other oxygen lances to supply oxygen to the furnace body for smelting for 13 minutes to 18 minutes, the gas source of the side-blowing lance body is switched to oxygen, and the oxygen supply gear is turned on from the lowest gear, and upgraded one gear every 2 minutes to 3 minutes, gradually reaching the highest gear.

[0014] When a hole penetrating the furnace wall is reserved at the side-blowing gun installation position of the furnace wall of the steel smelting furnace body, the diameter of the hole is 2mm~3mm larger than the diameter of the pipe of the side-blowing gun body.

[0015] When a new steel smelting furnace is smelted for the first time, the sintering time of the new furnace shall be ≥ 2.0 hours to allow the refractory materials of the furnace body, especially the refractory mud at the installation position of the side-blowing oxygen lance, to be fully sintered.

[0016] The installation guide rod is made of smooth steel bars.

[0017] When using the installation guide rod to clear the hole filled with refractory mud, two short steel bars are welded to the tail of the installation guide rod, and the two short steel bars are flush with the tail of the installation guide rod.

[0018] When applying refractory mud on the side-blowing gun body, the thickness of the refractory mud is 2mm~4mm.

[0019] When the side blowing gun head passes through the installation hole and is exposed inside the furnace body, the length of the gun head of the side blowing gun body exposed in the furnace body is 20mm~30mm.

[0020] The refractory mud filled in the hole is silicon carbide refractory mud; the refractory mud coated on the surface of the side-blowing gun body is silicon carbide refractory mud.

[0021] The nitrogen flow rate blown into the side blowing gun body is above 150Nm3 / h, and the nitrogen flow rate blown into the annular seam layer is above 60Nm3 / h.

[0022] The steel smelting furnace side blowing gun body structure of the present invention has a plurality of side blowing gun body installation positions on the steel smelting furnace body, each side blowing gun body installation position is provided with a hole, and a side blowing gun body is installed in each hole.

[0023] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0024] The method for installing the side-blowing lance body of a steel smelting furnace body described in the present invention can complete the installation and replacement of the side-blowing oxygen lance within 15 minutes. The entire installation process is simple and fast, with high installation efficiency, and effectively guarantees the use quality of the side-blowing lance body of the furnace body after installation, comprehensively improves safety during operation, and ensures personnel safety. The method for installing the side-blowing lance body of a steel smelting furnace body described in the present invention can conveniently and quickly realize the installation of the side-blowing lance body, ensure installation quality, avoid major safety accidents such as steel penetration or even furnace penetration, improve on-site operation safety, and protect the personal safety of on-site personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following is a brief description of the contents and symbols in the drawings of this specification:

[0026] Figure 1 This is a structural schematic diagram of the side-blowing gun installation method for a steel smelting furnace according to the present invention;

[0027] Figure 2 This is a structural schematic diagram of another angle of the side-blowing gun installation method for a steel smelting furnace according to the present invention;

[0028] Figure 3 This is a schematic top view of the structure of the side-blowing gun body installation method for a steel smelting furnace according to the present invention;

[0029] The marks in the attached drawings are: 1. steel smelting furnace body; 2. side blowing gun body installation position; 3. side blowing gun body; 4. hole. DETAILED DESCRIPTION

[0030] The following describes the embodiments with reference to the accompanying drawings to further explain in detail the specific embodiments of the present invention, such as the shapes, structures, mutual positions and connection relationships between the various components involved, the functions and working principles of the various components.

[0031] As attached Figure 1 -Attached Figure 3 As shown, the present invention is a method for installing a side-blowing gun body of a steel smelting furnace. The installation steps of the side-blowing gun body installation method of the steel smelting furnace are as follows:

[0032] S1. During the refractory masonry process for a new steelmaking furnace, a hole is reserved through the furnace wall at the side-blowing lance mounting area. Refractory mortar is filled into the hole until the entire hole is completely filled. S2. During the first heat of a new steelmaking furnace, the side-blowing oxygen lance is not installed, and the furnace is run as if it were a new furnace, allowing the furnace refractory materials, especially the refractory mortar at the side-blowing oxygen lance mounting area, to fully sinter. After the first heat of the new furnace is completed, molten steel is poured, leaving little or no molten steel in the furnace. S3. Use a guide rod to clear the hole for the refractory mortar. The diameter of the guide rod should be the same as that of the side-blowing lance, and the surface should be polished smooth to remove any burrs or deflections. After the hole is cleared, the rod can be quickly removed by twisting the end of the rod with a wrench. S4. Apply refractory clay to the surface of the side-blowing lance body; connect the gas source to the side-blowing lance body, supply nitrogen to the center hole of the side-blowing lance body, and also supply nitrogen to the annular seam layer of the side-blowing lance body; S5. With nitrogen flowing throughout, insert the side-blowing lance head from the outside of the furnace wall into the hole at the side-blowing lance installation location, so that the lance body is embedded in the hole; until the side-blowing lance head passes through the installation hole and the lance head is exposed inside the furnace body, the installation of the side-blowing oxygen lance is completed. The above steps address the shortcomings of the existing technology and propose a new technical solution. The side-blowing lance body includes a center hole and annular seam layer, and the side-blowing lance body is used to blow oxygen into the furnace body. The purpose of the present invention is to realize the installation of a side-blowing lance body on an existing steel smelting furnace body. The side-blowing lance body of the present invention is also called a side-blowing oxygen lance. The method of the present invention is not only used for blowing oxygen, but can also be used to supply other gases. Therefore, it is also applicable to other furnace bodies that require side-blowing. Using the side-blowing lance body installation method for a steel smelting furnace body described in the present invention, the installation and replacement of the side-blowing oxygen lance can be completed within 15 minutes, greatly improving efficiency. Therefore, the entire installation process is simple and fast, with high installation efficiency, and effectively guarantees the use quality of the side-blowing gun body of the furnace body after installation, comprehensively improving the safety during operation and protecting personnel. The method for installing the side-blowing gun body of a steel smelting furnace body of the present invention has simple steps, can conveniently and quickly realize the installation of the side-blowing gun body, ensure the installation quality, avoid major safety accidents such as steel penetration or even furnace penetration, improve the safety of on-site operations, and protect the personal safety of on-site personnel.

[0033] After the installation of the side-blowing oxygen lance is completed, feed smelting is carried out, but the gas source of the side-blowing lance body is still supplied with nitrogen. After using other oxygen lances to supply oxygen to the furnace body for smelting for 13min-18min, the gas source of the side-blowing lance body is switched to oxygen, and the oxygen supply gear is turned on from the lowest gear, and upgraded one gear every 2min-3min, gradually opening to the highest gear, thus entering the normal use environment.

[0034] When a hole is reserved for the side-blowing gun installation area on the steel smelting furnace wall, the hole diameter should be 2mm to 3mm larger than the side-blowing gun pipe diameter. In the above steps, the hole diameter should be 2mm to 3mm larger than the gun pipe diameter to ensure that the side-blowing gun body can be smoothly inserted after being coated with refractory mud.

[0035] During the first smelting of a new steelmaking furnace, allow the furnace refractory materials, especially the refractory clay at the side-blowing oxygen lance installation area, to fully sinter. The sintering time for the new furnace should be ≥ 2.0 hours. This step ensures that the furnace refractory materials, especially the refractory materials and masonry materials at the side-blowing oxygen lance installation area, are fully sintered. This ensures that the subsequent side-blowing oxygen lance body is firmly embedded in the hole, and that the refractory materials around the lance body and the masonry materials in the gaps between the refractory materials are firmly bonded. This ensures that the side-blowing oxygen lance body is securely installed and does not easily fall out of the furnace body.

[0036] After the first smelting of a new steel smelting furnace is completed, molten steel is added to ensure that there is no or little molten steel left in the furnace, and the molten steel and slag levels are below the position of the side-blowing gun installation holes reserved in the furnace, so as to complete the conduction of the reserved holes and the installation of the side-blowing gun body, which is convenient for construction and not affected by the molten steel.

[0037] The mounting guide rod is made of smooth steel. The diameter of the smooth steel bar is the same as that of the side-blowing gun. The surface of the mounting guide rod is polished to remove burrs and deflections. This prevents the guide rod from being unable to be removed smoothly after the side-blowing gun mounting hole is cleared, which would waste time.

[0038] When using an installation guide rod to clear a hole filled with refractory mud, two short steel bars are welded to the tail of the installation guide rod, and the two short steel bars are flush with the tail of the installation guide rod. Use the installation guide rod to clear the side-blowing hole filled with silicon carbide refractory mud so that the subsequent side-blowing gun can be quickly and smoothly embedded, and it can ensure that the center hole and annular seam layer of the side-blowing gun body are not blocked by refractory mud, ensuring normal use. The short steel bar increases the area of ​​the tail of the installation guide rod. Its main function is to facilitate hitting the tail of the installation guide rod with a hammer when clearing the hole, avoiding the structure with only the installation guide rod, which is easy to miss when hitting. After the clearing is completed, it is convenient to twist the tail of the guide rod with a wrench to quickly remove the guide rod.

[0039] When applying refractory mud on the side-blowing gun body, the thickness of the refractory mud should be 2mm~4mm. In the above steps, the refractory mud is applied to the surface of the side-blowing gun body to effectively fill the remaining gap between the hole and the gun body during the gun body embedding process, ensuring close contact between the gun body and the refractory material, and preventing the occurrence of steel penetration.

[0040] When the side-blowing gun tip passes through the installation hole and emerges from the furnace body, the length of the gun tip exposed in the furnace body should be 20mm to 30mm. The 20-30mm gun tip length in the above step can not only slow down the burning of the gun body, but also reduce the impact of the oxygen jet on the refractory materials near the gun body.

[0041] The refractory mud filled into the hole is silicon carbide refractory mud; the refractory mud applied on the surface of the side-blowing gun body is silicon carbide refractory mud. In the above steps, the preferred refractory mud is silicon carbide refractory mud.

[0042] The nitrogen flow rate for the side-blowing gun body should be at least 150 Nm³ / h, and the nitrogen flow rate for the annular seam layer should be at least 60 Nm³ / h. In the above steps, with nitrogen flowing throughout, insert the side-blowing gun body from the outside of the furnace wall into the hole in the side-blowing gun. Then, strike the side-blowing gun body with a hammer until it is embedded in the corresponding position in the hole.

[0043] The side-blowing lance structure of the steel smelting furnace of the present invention comprises a plurality of side-blowing lance mounting locations 2 provided on the steel smelting furnace 1, each of which is provided with a hole 4, and a side-blowing lance 3 is mounted in each hole 4. The side-blowing lances extend into the steel smelting furnace 1.

[0044] The method for installing the side-blowing lance body of a steel smelting furnace body described in the present invention can complete the installation and replacement of the side-blowing oxygen lance within 15 minutes. The entire installation process is simple and fast, with high installation efficiency, and effectively guarantees the use quality of the side-blowing lance body of the furnace body after installation, comprehensively improves safety during operation, and ensures personnel safety. The method for installing the side-blowing lance body of a steel smelting furnace body described in the present invention can conveniently and quickly realize the installation of the side-blowing lance body, ensure installation quality, avoid major safety accidents such as steel penetration or even furnace penetration, improve on-site operation safety, and protect the personal safety of on-site personnel.

[0045] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using 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 scope of protection of the present invention.

Claims

1. A method for installing a side-blowing gun body in a steel smelting furnace, characterized by: The installation steps of the side-blowing gun body installation method for the steel smelting furnace are as follows: S1. During the refractory masonry process for a new steelmaking furnace, a hole is reserved through the furnace wall for the side-blowing lance installation area. The hole is filled with refractory mud until it completely fills the hole. S2. When smelting the first heat in a new steelmaking furnace, do not install the side-blowing oxygen lance and conduct the smelting as if it were a new furnace, allowing the refractory clay at the side-blowing oxygen lance installation site to fully sinter. After the first heat of the new furnace is completed, drain the molten steel, leaving little or no molten steel in the furnace. S3. Use the guide rod to unclog the hole filled with refractory mud. The diameter of the guide rod should be the same as that of the side-blowing lance, and the surface of the guide rod should be polished smooth to remove burrs and deflections. After the hole is unclogged, twist the end of the guide rod with a wrench to quickly remove it. S4. Apply refractory mud on the surface of the side-blowing gun body; connect the gas source to the side-blowing gun body, supply nitrogen to the center hole of the side-blowing gun body, and also supply nitrogen to the annular seam layer of the side-blowing gun body; S5. While nitrogen is flowing throughout the process, insert the oxygen lance tip from the outside of the furnace wall into the hole where the oxygen lance is installed, inserting the lance body into the hole until the tip passes through the hole and emerges from the furnace. This completes the installation of the oxygen lance. After the installation of the side-blowing oxygen lance is completed, the material is fed and smelted, but the gas source of the side-blowing lance body is still supplied with nitrogen. After smelting for 13-18 minutes by using other oxygen lances to supply oxygen into the furnace body, the gas source of the side-blowing lance body is switched to oxygen, and the oxygen supply gear is opened from the lowest gear, and upgraded every 2-3 minutes until it reaches the highest gear. The refractory materials and masonry materials at the side-blowing gun installation site are fully sintered to ensure that the subsequent side-blowing gun body is firmly embedded in the hole, and the refractory materials around the gun body and the masonry materials in the gaps between the refractory materials are stably bonded, ensuring that the side-blowing gun body is reliably installed and will not easily fall off the furnace body; When using the installation guide rod to clear the holes filled with refractory mud, two short steel bars are welded to the tail of the installation guide rod, and the two short steel bars are flush with the tail of the installation guide rod. The installation guide rod is used to clear the side-blowing holes filled with silicon carbide refractory mud, so that the subsequent side-blowing gun can be embedded, ensuring that the center hole and the annular seam layer of the side-blowing gun body are not blocked by the refractory mud, ensuring normal use; the short steel bars increase the area of ​​the tail of the installation guide rod, which is convenient for hitting the tail of the installation guide rod with a hammer when clearing the holes, avoiding a structure with only the installation guide rod, which is easy to miss when hitting. After the clearing is completed, it is convenient to twist the tail of the guide rod with a wrench to quickly remove the guide rod.

2. The method for installing a side-blowing gun body for a steel smelting furnace according to claim 1, characterized in that: When a hole penetrating the furnace wall is reserved at the side-blowing gun installation position of the furnace wall of the steel smelting furnace body, the diameter of the hole is 2mm~3mm larger than the diameter of the pipe of the side-blowing gun body.

3. The method for installing a side-blowing gun body for a steel smelting furnace according to claim 1 or 2, characterized in that: When a new steel smelting furnace is smelted for the first time, the sintering time of the new furnace shall be ≥ 2.0 hours to allow the refractory clay at the installation location of the side-blowing oxygen lance to be fully sintered.

4. The method for installing a side-blowing gun body for a steel smelting furnace according to claim 1 or 2, characterized in that: The installation guide rod is made of smooth steel bars.

5. The method for installing a side-blowing gun body for a steel smelting furnace according to claim 4, characterized in that: When using the installation guide rod to clear the hole filled with refractory mud, two short steel bars are welded to the tail of the installation guide rod, and the two short steel bars are flush with the tail of the installation guide rod.

6. The method for installing a side-blowing gun body for a steel smelting furnace according to claim 1 or 2, characterized in that: When applying refractory mud on the side-blowing gun body, the thickness of the refractory mud is 2mm~4mm.

7. The method for installing a side-blowing gun body for a steel smelting furnace according to claim 1 or 2, characterized in that: When the side blowing gun head passes through the installation hole and is exposed inside the furnace body, the length of the gun head of the side blowing gun body exposed in the furnace body is 20mm~30mm.

8. The method for installing a side-blowing gun body for a steel smelting furnace according to claim 1 or 2, characterized in that: The refractory mud filled in the hole is silicon carbide refractory mud; the refractory mud coated on the surface of the side-blowing gun body is silicon carbide refractory mud.

9. The method for installing a side-blowing gun body for a steel smelting furnace according to claim 1 or 2, characterized in that: A plurality of side-blowing gun body mounting locations (2) are provided on a steel smelting furnace body (1), each side-blowing gun body mounting location (2) is provided with a hole (4), and a side-blowing gun body (3) is installed in each hole (4).

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