Novel flame-retardant RH top lance structure

Abstract

The utility model relates to a novel flame-retardant RH top lance structure, which comprises an RH top lance spray head, an oxygen pipe, a gas pipe, a water inlet and return riser and an RH top lance outer pipe, a spray head connecting pipe and a flame-retardant copper pipe are sequentially connected between the oxygen pipe and the RH top lance spray head, a nozzle of the RH top lance spray head is of a Laval structure, a gas hole is arranged at the position of the nozzle close to a nozzle opening, and the flame-retardant copper pipe is connected with the nozzle connecting pipe. The gas hole is a special-shaped long hole with a large front end opening and a small rear end opening, a UV flame probe is arranged on one side of a nozzle opening of the RH top lance spray head, a data cable connected with the UV flame probe is arranged in a probe pipeline, and the probe pipeline is arranged in a gas pipe. The RH gun is effectively prevented from tempering and damaging the gun body, the service life of the gun body is prolonged, explosion caused by sudden heat accumulation and expansion of the gun body is avoided, the safety of surrounding equipment is improved, and potential safety hazards of field operators are eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of RH top lance structures, in particular to a novel flame-retardant RH top lance structure. Background Technique

[0002] The RH secondary refining technology is an important step in steel smelting. Initially, the RH device was mainly used for dehydrogenating molten steel. Later, functions such as vacuum deoxidation, improving the cleanliness of molten steel, and alloying were added. Compared with other refining technologies, it has the advantages of short treatment cycle, large production capacity, and good refining effect, and is very suitable for matching with large steelmaking furnaces.

[0003] Since the RH process is an essential part of the steel enterprise's smelting process, during the use of the RH top lance, if the oxygen and gas flow rates are inappropriate, it is very easy to cause the phenomenon of flame back-burning into the oxygen pipe. In the light case, it will cause damage to the RH top lance, reduce the service life of the RH top lance, increase the maintenance cost of the RH refining furnace, and increase the economic burden of refined molten steel. In the heavy case, it will cause an explosion and production accidents, damage the surrounding equipment, and pose a safety hazard to the surrounding operators.

[0004] The Chinese invention patent with the invention publication number CN116219119A discloses "a double-flow oxygen top lance for an RH refining furnace". Although this invention discloses an RH top lance with an annular oxygen pipe arrangement, the accelerated oxygen injection at its nozzle lengthens the flame length of the RH top lance and prevents the nozzle from being burned out. However, the gas and oxygen are not evenly mixed, and epoxy is needed to supplement oxygen for combustion. The gas combustion is uncontrollable, and the flame is easy to enter the lance body from the annular oxygen pipe, causing the RH top lance to burn. Moreover, this RH oxygen top lance arrangement cannot self-extinguish and prevent backfire. Once a backfire accident occurs, it cannot prevent the backfire flame from burning out the RH top lance and cannot avoid the occurrence of RH top lance backfire explosion, with poor safety and posing a great safety hazard to the surrounding operators. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a novel flame-retardant RH top lance structure. By extending the length of the flame-retardant copper pipe connecting the nozzle of the RH top lance and the oxygen pipe of the lance body, at room temperature, the thermal conductivity of copper is about 25 times that of stainless steel. Increasing the length of the flame-retardant copper pipe greatly increases the heat conduction area of the RH top lance, so that once a backfire phenomenon occurs, it will not cause a large amount of heat to accumulate in a short time and cause damage to the lance body, reduce the backfire temperature, effectively prevent the backfire from rising, improve the service life of the RH top lance, and ensure the safety of the entire production process.

[0006] In order to achieve the above object, the utility model adopts the following technical solutions:

[0007] A new type of flame-retardant RH top lance structure, including an RH top lance nozzle, an oxygen pipe, a gas pipe, an inlet and return water separating pipe, and an RH top lance outer pipe. The gas pipe is arranged outside the oxygen pipe. The RH top lance outer pipe is arranged on the outer circumferences of the oxygen pipe and the gas pipe. The inlet and return water separating pipes are evenly arranged in the circumferential wall between the RH top lance outer pipe and the gas pipe. The front end of the RH top lance outer pipe is provided with an RH top lance nozzle. Between the oxygen pipe and the RH top lance nozzle, a nozzle connecting pipe and a flame-retardant copper pipe are connected in sequence. The nozzle of the RH top lance nozzle is of a Laval structure. Gas holes are arranged at a position near the nozzle orifice of the nozzle. The gas holes are special-shaped long holes with a larger opening at the front end and a smaller opening at the rear end. A UV flame detector is arranged on one side of the nozzle orifice of the RH top lance nozzle. The data cable connected to the UV flame detector is arranged in a probe pipe, and the probe pipe is arranged in the gas pipe.

[0008] Further, the length of the flame-retardant copper pipe is 400 - 500 mm.

[0009] Further, the gas holes are obliquely opened in the direction towards the nozzle orifice.

[0010] Further, the gas holes are evenly arranged on the circumferential wall of the nozzle.

[0011] Further, the connection structure between the flame-retardant copper pipe and the nozzle is of a Laval structure.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. The length of the flame-retardant copper pipe connecting the RH top lance nozzle and the lance body oxygen pipe is extended. By utilizing the thermal conductivity coefficient of copper far higher than that of stainless steel, during the tempering process, the copper pipe increases the export of the tempering temperature, and increasing the length of the flame-retardant copper pipe greatly improves the heat conduction area of the RH top lance oxygen pipe. Once a tempering phenomenon occurs, a large amount of heat generated in a short time is dissipated by the lengthened flame-retardant copper pipe, reducing the tempering temperature inside the flame-retardant copper pipe, making it not easy to have heat accumulation and cause damage to the lance body, effectively preventing the RH lance from being damaged by tempering, improving the service life of the lance body, avoiding the sudden heat accumulation and expansion of the lance body and explosion, improving the safety of surrounding equipment, and eliminating the safety hazards of on-site operators.

[0014] 2. The gas holes with special-shaped oblique openings at the nozzle orifice are centrally pressurized and ejected to the center position of the nozzle orifice. During the process of pressurizing and ejecting the gas, the pressurized gas and the pressurized oxygen can be fully fused, without the need for supplementary oxygen, avoiding the burning damage phenomenon caused by multiple oxygen channels, increasing the flame combustion path, avoiding the nozzle approaching the molten steel surface, and effectively preventing tempering.

[0015] 3. A UV flame probe is set on the side of the nozzle to detect the ignition condition of the nozzle position, monitor the flame combustion condition of the nozzle and the real-time temperature monitoring of the nozzle in real time, monitor the heat accumulation in time, and provide real-time feedback on the temperature condition in the RH top gun, so as to timely discover and deal with the flashback accident, so as to achieve early prevention, early detection and early treatment, and avoid the occurrence of flashback explosion accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of a novel flame-retardant RH top gun described in the utility model.

[0017] Figure 2 This is a partial enlarged view (A) of the RH top gun nozzle connection structure provided by the utility model.

[0018] In the figure: 1-RH top gun nozzle, 2-flame retardant copper tube, 3-gas pipe, 4-inlet and return water riser, 5-RH top gun outer tube, 6-nozzle pipe, 7-oxygen pipe, 8-RH top gun positioning plate, 9-return flange and pipe, 10-inlet flange and pipe, 11-gun body connection flange 1, 12-gas flange and pipe, 13-gun body connection flange 2, 14-oxygen flange and pipe, 15-gun tail end cover, 16-UV probe pipe, 17-RH top gun hanger, 18-gun body, 19-nozzle, 20-UV flame probe, 21-nozzle mouth, 22-gas hole, 23-probe pipeline, A-partial enlarged view DETAILED DESCRIPTION

[0019] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0020] like Figure 1 - Figure 2 As shown, the working principle of a novel flame-retardant RH top gun structure is as follows: an extended flame-retardant copper tube 2 is arranged between the oxygen tube 7 and the RH top gun nozzle 1. The high thermal conductivity of the flame-retardant copper tube 2 can prevent the sudden accumulation of heat during the tempering process and cause explosion or damage to the top gun. The special-shaped gas hole 22 with an oblique opening at the nozzle 19 allows the gas to be pressurized and concentrated to enter the nozzle 19. The oblique opening lengthens the path for the gas to enter the nozzle 19, which prolongs the mixing time of the gas and oxygen, makes the mixing more complete, and makes the combustion more thorough. The flame path of the pressurized gas and oxygen mixed gas rushing out of the nozzle port 21 is lengthened, and the distance between the nozzle port 21 and the molten steel liquid surface is lengthened, which effectively prevents the occurrence of tempering.

[0021] like Figure 1 - Figure 2As shown in the figure, a new type of flame-retardant RH top lance structure includes an RH top lance nozzle 1, an oxygen pipe 7, a gas pipe 3, an inlet and return water separation pipe 4, and an RH top lance outer pipe 5. The gas pipe 3 is arranged outside the oxygen pipe 7. The RH top lance outer pipe 5 is arranged on the outer circumferences of the oxygen pipe 7 and the gas pipe 3. The inlet and return water separation pipes 4 are evenly arranged in the circumferential wall between the RH top lance outer pipe 5 and the gas pipe 3. The front end of the RH top lance outer pipe 5 is provided with the RH top lance nozzle 1. The RH top lance extends into the furnace body of the RH refining furnace. The RH top lance positioning plate 8 positions the RH top lance in the RH refining furnace. The return water flange and connecting pipe 9 and the inlet water flange and connecting pipe 10 are connected to the inlet and return water separation pipe 4. A gas flange and connecting pipe 12 is arranged between the gun body connecting flange 11 and the gun body connecting flange 13 to connect the gas pipe 3. The oxygen flange and connecting pipe 14 at the rear end of the gun body connecting flange 13 is connected to the oxygen pipe 7. The gun tail end cover 15 is tightly pressed for sealing. Between the oxygen pipe 7 and the RH top lance nozzle 1, a nozzle connecting pipe 6 and a flame-retardant copper pipe 2 are sequentially connected. The oxygen pipe 7 of the RH top lance is made of stainless steel, and the flame-retardant copper pipe 2 is made of red copper. When welding these two materials, the nozzle connecting pipe 6 needs to be arranged in the middle. One end of the nozzle connecting pipe 6 is welded to the oxygen pipe 7, and the other end is welded to the flame-retardant copper pipe 2. Since the thermal conductivity of red copper is 25 times that of stainless steel, when tempering occurs, the tempering passes through the flame-retardant copper pipe 2, and the internal heat is quickly dissipated, which can effectively prevent sudden heat accumulation, prevent the top lance from being burned, prevent heat concentration explosion, and effectively prevent the spread of tempering. The nozzle 19 of the RH top lance nozzle 1 is of a Laval structure. The nozzle 19 is connected to the rear-end flame-retardant copper pipe 2, and the oxygen pipe 7 is connected behind the flame-retardant copper pipe 2. Oxygen enters the nozzle 19 through the flame-retardant copper pipe 2. The nozzle 19 adopts a Laval structure, so that oxygen is ejected from the nozzle orifice 21 at supersonic speed. A gas hole 22 is arranged near the nozzle orifice 21 of the nozzle 19. The gas hole 22 is a special-shaped long hole with a large front opening and a small rear opening. The position of the nozzle 19 is the position where gas and oxygen are mixed and ignited. By using the special-shaped gas hole 22, the introduced gas is pressurized through the rear small hole and then boosted to be released at the large-diameter position. In this way, the gas has a pressurizing process, and the gas hole 22 is obliquely opened in the direction of the nozzle orifice 21. When the gas enters, it obliquely cuts in, and the mixing time with oxygen is prolonged. The gas and oxygen are fully mixed, and the gas burns more thoroughly. A UV flame detector 20 is arranged on one side of the nozzle orifice 21 of the RH top lance nozzle 1. The data cable 24 connected to the UV flame detector 20 is arranged in the probe pipe 23, and the probe pipe is arranged in the gas pipe 3. The UV flame detector 20 detects the ignition situation and flame combustion situation at the nozzle orifice 21 position, and monitors the use situation of the RH top lance in real time to prevent the occurrence of tempering.

[0022] Furthermore, the length of the flame-retardant copper tube 2 is 400 - 500 mm. The length of the flame-retardant copper tube 2 connecting the RH top lance nozzle 1 and the oxygen pipe 7 of the lance body 18 is extended. By utilizing the thermal conductivity of copper far higher than that of stainless steel, during the tempering process, the copper tube increases the export of the tempering temperature. Increasing the length of the flame-retardant copper tube 2 greatly improves the heat conduction area of the RH top lance, so that once a tempering phenomenon occurs, a large amount of heat is dissipated by the lengthened flame-retardant copper tube 2 in a short time, reducing the tempering temperature inside the flame-retardant copper tube 2 and making it not easy to cause heat accumulation and damage to the lance body 18.

[0023] As Figure 2 shown, furthermore, the gas holes 22 are obliquely opened in the direction towards the nozzle orifice 21. The oblique opening lengthens the path of the gas entering the nozzle 19, and the mixing time of the gas and oxygen is lengthened.

[0024] Furthermore, the gas holes 22 are evenly distributed on the circumferential wall of the nozzle 19.

[0025] As Figure 1 - Figure 2 shown, furthermore, the connection structure between the flame-retardant copper tube 2 and the nozzle 19 is a Laval structure. During the injection process, oxygen is compressed and pressurized, and then ejected through a contracted small-diameter opening. The injection distance of the pressurized oxygen is lengthened, the flame length of the mixed ignition combustion with the gas is lengthened, and the distance between the nozzle orifice 21 and the molten steel surface will also increase, effectively preventing the occurrence of tempering.

[0026] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and its concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A novel flame retardant RH top gun structure, comprising an RH top gun nozzle, an oxygen pipe, a gas pipe, an inlet and return water riser and an RH top gun outer pipe, wherein the gas pipe is arranged outside the oxygen pipe, the RH top gun outer pipe is arranged on the outer circumference of the oxygen pipe and the gas pipe, the inlet and return water riser is evenly arranged in the circumferential wall between the RH top gun outer pipe and the gas pipe, and the RH top gun nozzle is arranged at the front end of the RH top gun outer pipe, characterized in that: A nozzle connecting pipe and a flame-retardant copper tube are connected in sequence between the oxygen tube and the RH top gun nozzle. The nozzle of the RH top gun nozzle is a Laval structure. A gas hole is arranged near the nozzle opening of the nozzle. The gas hole is an irregular long hole with a large opening at the front end and a small opening at the rear end. A UV flame probe is arranged on one side of the nozzle opening of the RH top gun nozzle. A data cable connected to the UV flame probe is arranged in a probe pipe, and the probe pipe is arranged in a gas pipe.

2. A novel flame retardant RH top gun structure according to claim 1, characterized in that: The length of the flame-retardant copper tube is 400-500 mm.

3. A novel flame retardant RH top gun structure according to claim 1, characterized in that: The gas hole opens obliquely toward the nozzle opening.

4. A novel flame retardant RH top gun structure according to claim 1 or 3, characterized in that: The gas holes are evenly distributed on the circumferential wall of the nozzle.

5. A novel flame retardant RH top gun structure according to claim 1, characterized in that: The connection structure between the flame-retardant copper tube and the nozzle is a Laval structure.

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