Secondary combustion oxygen lance for mixed injection of carbon dioxide

Abstract

According to the secondary combustion oxygen lance for mixed injection of carbon dioxide, the oxygen lance is composed of a lance body and a lance head detachably installed on the lance body, and the lance body and the lance head are each concentrically provided with an oxygen pipe, a carbon dioxide pipe and a cooling pipe from inside to outside. An oxygen inlet pipe for supplying oxygen to the oxygen pipe, a carbon dioxide inlet pipe for supplying carbon dioxide to the carbon dioxide pipe, and a water inlet pipe and a water outlet pipe for supplying cooling water to the cooling pipe and discharging the cooling water are arranged on the peripheral surface of the gun body at intervals; a flow baffle for prolonging the retention time of cooling water is arranged between the outer peripheral surface of the carbon dioxide pipe and the inner peripheral surface of the cooling pipe; one end of the gun head is connected with the end part of the gun body and is a detachable end, the other end of the gun head is an airflow spraying end, and the outer peripheral surface of the cooling pipe at the detachable end of the gun head is in threaded connection with the inner peripheral surface of the cooling pipe at the end part of the gun body. The oxygen lance not only can supply oxygen, but also can supply carbon dioxide, multiple selections can be carried out according to process requirements, and compared with an existing oxygen lance which can only supply gas singly, the oxygen lance is higher in selectivity and higher in economic practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of smelting, in particular to a secondary combustion oxygen gun for mixed injection of carbon dioxide. Background Art

[0002] In recent years, the development of thermal compensation technology for converter steelmaking has become a matter of public concern. The main problem faced by converters in increasing the scrap steel ratio is insufficient heat source in the furnace. In view of this situation, the commonly used technologies at home and abroad are: preheating of scrap steel inside or outside the converter, adding exothermic agent during smelting, pulverized coal injection, top-blown secondary combustion technology, etc., and top-blown secondary combustion technology has the advantages of small investment and high thermal efficiency compared with other methods. It is a technology generally recognized and widely studied in the steel industry; however, the oxygen lance used in converter steelmaking at present can generally only add a single gas, and the oxygen lance outlet end, that is, the lower end, is prone to form slag on the inner wall under long-term high temperature conditions, and the oxygen lance will be shortened due to slag erosion, and the oxygen lance itself cannot be disassembled. When the outlet end of the oxygen lance is eroded, the entire oxygen lance needs to be replaced, and the cost of the entire oxygen lance is high, and the installation and disassembly requires a certain amount of time; therefore, when slag appears at the outlet end of the oxygen lance, how to quickly replace the oxygen lance and overhaul it is particularly important. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a secondary combustion oxygen gun for mixed injection of carbon dioxide which has a reasonable structural design and a detachable structure in which the oxygen gun outlet end on the oxygen gun body can be directly disassembled when maintenance and replacement are required, thereby improving the operating efficiency to a certain extent.

[0004] The technical problem to be solved by the utility model is achieved through the following technical scheme: a secondary combustion oxygen gun for mixed injection of carbon dioxide, the oxygen gun consists of a gun body and a gun head detachably mounted on the gun body, the gun body and the gun head are both concentrically provided with an oxygen pipe, a carbon dioxide pipe and a cooling pipe from the inside to the outside, and an oxygen inlet pipe for supplying oxygen to the oxygen pipe, a carbon dioxide inlet pipe for supplying carbon dioxide to the carbon dioxide pipe, and a water inlet pipe and a water outlet pipe for supplying cooling water to and discharging cooling water to the cooling pipe are arranged at intervals on the outer peripheral surface of the gun body;

[0005] A baffle is provided between the outer circumference of the carbon dioxide pipe and the inner circumference of the cooling pipe to increase the retention time of cooling water;

[0006] One end of the gun head is connected to the end of the gun body and is set as a detachable end, and the other end is set as an airflow ejection end. The outer peripheral surface of the cooling pipe on the detachable end of the gun head is threadedly connected with the inner peripheral surface of the cooling pipe at the end of the gun body.

[0007] Preferably, three groups of baffles are provided, one group of baffles is fixed between the outer peripheral surface of the carbon dioxide tube of the gun head and the inner peripheral surface of the cooling tube, and the other two groups of baffles are fixed between the outer peripheral surface of the carbon dioxide tube of the gun body and the inner peripheral surface of the cooling tube at intervals one above and one below.

[0008] Preferably, the baffle is formed into a substantially spiral structure.

[0009] Preferably, an auxiliary connecting ring plate is fixedly provided on the outer peripheral surface of the carbon dioxide tube end on the detachable end of the gun head, and the inner peripheral surface of the auxiliary connecting ring plate is threadedly connected to the inner side wall of the gun body cooling tube.

[0010] Preferably, the inner circumferential surface of the end portion of the carbon dioxide tube on the detachable end of the gun head abuts against the outer circumferential surface of the end portion of the carbon dioxide tube on the gun body.

[0011] Preferably, the inner circumferential surface of the end portion of the oxygen tube on the detachable end of the gun head abuts against the outer circumferential surface of the end portion of the oxygen tube on the gun body.

[0012] Preferably, an upper clamping plate and a lower clamping plate are fixedly provided on the outer peripheral surface of the gun body, the upper clamping plate is located between the oxygen inlet pipe and the carbon dioxide inlet pipe, and the lower clamping plate is located below the water inlet pipe.

[0013] Compared with the prior art, the beneficial technical effects of the utility model are:

[0014] (1) The oxygen lance can supply both oxygen and carbon dioxide, and multiple options can be selected according to process requirements. Compared with the previous oxygen lances that can only supply a single gas, the oxygen lance has a wider range of options and is more economical and practical;

[0015] (2) Because the lance tip is closer to the airflow outlet of the lance, slag that is difficult to remove is easily formed on the inner surface of the lance tip. If the slag accumulates on the inner surface of the lance tip for a long time, it is easy to cause blockage, thus affecting the normal use of the oxygen lance. The lance tip and the lance body of the oxygen lance are detachably connected. The staff in the factory can directly unscrew the lance tip from the lance body, which is convenient and quick to disassemble and assemble. This can reduce costs and increase efficiency to a certain extent, thereby improving production capacity.

[0016] (3) The oxygen lance adds carbon dioxide to the top and bottom of the converter, allowing the carbon dioxide to participate in the converter ironmaking reaction while also enhancing the molten pool stirring capacity, achieving effective control of the molten pool temperature, increasing the scrap steel ratio, shortening the converter ironmaking time, and reducing the consumption of auxiliary materials. To a certain extent, it improves production efficiency and reduces process costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of the utility model after the gun body and the gun head are connected;

[0018] Figure 2 It is a schematic diagram of the main structure of the utility model after the gun body and the gun head are separated.

[0019] In the figure: 1. gun body; 2. gun head; 3. oxygen tube; 4. carbon dioxide tube; 5. cooling tube; 6. oxygen inlet tube; 7. water inlet tube; 8. water outlet tube; 9. baffle; 10. detachable end; 11. air flow ejection end; 12. auxiliary connecting ring plate; 13. carbon dioxide inlet tube; 14. upper clamping plate; 15. lower clamping plate. DETAILED DESCRIPTION

[0020] The specific technical solutions of the present invention are further described below with reference to the accompanying drawings, so as to facilitate further understanding of the present invention by those skilled in the art, and do not constitute any limitation to the rights thereof.

[0021] Example 1, reference Figure 1-2 A secondary combustion oxygen gun for mixed injection of carbon dioxide, the oxygen gun consists of a gun body 1 and a gun head 2 detachably mounted on the gun body 1, the gun body 1 and the gun head 2 are both concentrically provided with an oxygen tube 3, a carbon dioxide tube 4 and a cooling tube 5 from the inside to the outside, the length and diameter of the oxygen tube 3, the carbon dioxide tube 4 and the cooling tube 5 can be selected according to the use requirements, and an oxygen inlet pipe 6 for supplying oxygen to the oxygen tube 3, a carbon dioxide inlet pipe 13 for supplying carbon dioxide to the carbon dioxide tube 4, and a water inlet pipe 7 and a water outlet pipe 8 for supplying and discharging cooling water to the cooling tube 5 are arranged at intervals on the outer peripheral surface of the gun body 1;

[0022] A baffle plate 9 for increasing the retention time of cooling water is arranged between the outer circumference of the carbon dioxide tube 4 and the inner circumference of the cooling tube 5. The length of the baffle plate 9 can be selected according to the use requirements. The baffle plates 9 are arranged in three groups, and the number of groups is not limited to three groups. One group of baffle plates 9 is fixed between the outer circumference of the carbon dioxide tube of the gun head 2 and the inner circumference of the cooling tube, and the other two groups of baffle plates 9 are fixed between the outer circumference of the carbon dioxide tube of the gun body 1 and the inner circumference of the cooling tube at intervals of one above and one below. The baffle plates 9 are formed into a roughly spiral structure;

[0023] One end of the gun head 2 is connected to the end of the gun body 1 and is set as a detachable end 10, and the other end is set as an air flow ejection end 11. The outer peripheral surface of the cooling pipe on the detachable end 10 of the gun head 2 is threadedly connected with the inner peripheral surface of the cooling pipe at the end of the gun body 1, that is, the gun head 2 and the gun body 1 can be disassembled and replaced according to the use requirements;

[0024] An auxiliary connecting ring plate 12 is fixedly provided on the outer peripheral surface of the end of the carbon dioxide tube 4 on the detachable end 10 of the gun head 2. The auxiliary connecting ring plate 12 is formed into a roughly annular plate-shaped structure. The inner peripheral surface of the auxiliary connecting ring plate 12 is threadedly connected to the inner wall of the cooling tube of the gun body 1. That is to say, after the gun head 2 is connected to the gun body 1, since the outer wall and the inner wall of the cooling tube are connected by threads, the cooling water in the cooling tube 5 is prevented from leaking to the outside of the oxygen gun or the carbon dioxide tube 4. In addition, a high-temperature resistant sealing ring can be embedded in the threaded connection for auxiliary sealing;

[0025] The inner circumference of the end of the carbon dioxide tube on the detachable end 10 of the gun head 2 abuts against the outer circumference of the end of the carbon dioxide tube on the gun body 1, and the inner circumference of the end of the oxygen tube on the detachable end 10 of the gun head 2 abuts against the outer circumference of the end of the oxygen tube on the gun body 1. Figure 2 ;

[0026] An upper clamping plate 14 and a lower clamping plate 15 are fixedly arranged on the outer peripheral surface of the gun body 1. The upper clamping plate 14 and the lower clamping plate 15 are designed to facilitate the installation of the oxygen gun on the converter. They are formed into a roughly plate-like structure. The upper clamping plate 14 is located between the oxygen inlet pipe 6 and the carbon dioxide inlet pipe 13, and the lower clamping plate 15 is located below the water inlet pipe 7.

[0027] When the oxygen gun is in use, oxygen is supplied to the oxygen tube 3 by the oxygen inlet pipe 6, carbon dioxide is supplied to the carbon dioxide tube 4 by the carbon dioxide inlet pipe 13, cooling water is supplied to the cooling tube 5 by the water inlet pipe 7, and the cooling water is discharged from the cooling tube 5 through the water outlet pipe 8. After the oxygen gun has been used for a certain period of time, the gun head 2 of the oxygen gun can be regularly disassembled and repaired to ensure the normal use of the oxygen gun. Compared with the previous non-detachable oxygen gun, the oxygen gun is convenient and quick to disassemble and assemble, which can achieve cost reduction and efficiency improvement to a certain extent and improve production capacity.

Claims

1. A secondary combustion oxygen lance for mixed injection of carbon dioxide, characterized in that: The oxygen gun is composed of a gun body and a gun head detachably mounted on the gun body, wherein the gun body and the gun head are both concentrically provided with an oxygen tube, a carbon dioxide tube and a cooling tube from the inside to the outside, and an oxygen inlet tube for supplying oxygen to the oxygen tube, a carbon dioxide inlet tube for supplying carbon dioxide to the carbon dioxide tube, and a water inlet tube and a water outlet tube for supplying cooling water to and discharging cooling water from the cooling tube are arranged at intervals on the outer peripheral surface of the gun body; A baffle is provided between the outer circumference of the carbon dioxide pipe and the inner circumference of the cooling pipe to increase the retention time of cooling water; One end of the gun head is connected to the end of the gun body and is set as a detachable end, and the other end is set as an airflow ejection end. The outer peripheral surface of the cooling pipe on the detachable end of the gun head is threadedly connected with the inner peripheral surface of the cooling pipe at the end of the gun body.

2. The secondary combustion oxygen lance for mixed injection of carbon dioxide according to claim 1, characterized in that: There are three groups of baffles, one of which is fixed between the outer circumference of the carbon dioxide tube of the gun head and the inner circumference of the cooling tube, and the other two groups of baffles are fixed between the outer circumference of the carbon dioxide tube of the gun body and the inner circumference of the cooling tube at intervals one above and one below.

3. The secondary combustion oxygen lance for mixed injection of carbon dioxide according to claim 1, characterized in that: The baffle is formed into a substantially spiral structure.

4. The secondary combustion oxygen lance for mixed injection of carbon dioxide according to claim 1, characterized in that: An auxiliary connecting ring plate is fixedly provided on the outer peripheral surface of the carbon dioxide tube end on the detachable end of the gun head, and the inner peripheral surface of the auxiliary connecting ring plate is threadedly connected with the inner side wall of the gun body cooling tube.

5. The secondary combustion oxygen lance for mixed injection of carbon dioxide according to claim 1, characterized in that: The inner peripheral surface of the end of the carbon dioxide tube on the detachable end of the gun head abuts against the outer peripheral surface of the end of the carbon dioxide tube on the gun body.

6. The secondary combustion oxygen lance for mixed injection of carbon dioxide according to claim 1, characterized in that: The inner peripheral surface of the end of the oxygen tube on the detachable end of the gun head abuts against the outer peripheral surface of the end of the oxygen tube on the gun body.

7. A secondary combustion oxygen lance for mixed injection of carbon dioxide according to claims 1-6, characterized in that: An upper clamping plate and a lower clamping plate are fixedly arranged on the outer peripheral surface of the gun body, the upper clamping plate is located between the oxygen inlet pipe and the carbon dioxide inlet pipe, and the lower clamping plate is located below the water inlet pipe.

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