CN115044735A - Bottom blowing gun, converter and bottom blowing method - Google Patents
Bottom blowing gun, converter and bottom blowing method Download PDFInfo
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- CN115044735A CN115044735A CN202210683964.5A CN202210683964A CN115044735A CN 115044735 A CN115044735 A CN 115044735A CN 202210683964 A CN202210683964 A CN 202210683964A CN 115044735 A CN115044735 A CN 115044735A
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- bottom blowing
- blowing
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- 238000007664 blowing Methods 0.000 title claims abstract description 234
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 72
- 239000011261 inert gas Substances 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 239000011819 refractory material Substances 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 abstract description 12
- 230000002035 prolonged effect Effects 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
- 238000003723 Smelting Methods 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 239000002893 slag Substances 0.000 description 9
- 230000003628 erosive effect Effects 0.000 description 8
- 230000004888 barrier function Effects 0.000 description 7
- 239000011449 brick Substances 0.000 description 7
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
- C21C5/4613—Refractory coated lances; Immersion lances
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
Abstract
The invention discloses a bottom blowing gun, a converter and a bottom blowing method, wherein the bottom blowing gun is used for bottom blowing of molten steel in the converter, the bottom blowing gun comprises an outer pipe, an inner pipe and a bottom blowing pipe, the inner pipe is coaxially arranged in the outer pipe, and a circular seam for introducing inert gas is arranged between the inner pipe and the outer pipe; the bottom blowing pipes are provided with a plurality of bottom blowing pipes for blowing CO 2 And the gas is arranged in the inner pipe at intervals of the plurality of bottom blowing pipes and in parallel with the inner pipe, and the refractory material is filled between the inner pipe and the plurality of bottom blowing pipes. The bottom blowing gun provided by the invention has a good stirring effect, is not easy to block, has a long service life, and can not corrode the lining of the converter, so that the service life of the lining of the converter is prolonged.
Description
Technical Field
The invention belongs to the technical field of steel making, and particularly relates to a bottom blowing gun, a converter and a bottom blowing method.
Background
Is CO of China 2 The annual emission of gas emission households is about 19.27 hundred million tons (the national crude steel yield is 10.53 hundred million tons in 2020, and the emission of CO per ton steel is about 1.83 tons 2 Gas) accounting for about 15% of the total national industrial emissions. If CO is developed 2 The resource utilization technology in the steelmaking process not only can greatly reduce CO 2 The waste can be changed into valuable, the metallurgical effect is improved, and the method has great significance for improving the competitiveness of enterprises in green and environmental protection links. Relevant research shows that the converter adopts bottom blowing CO 2 The process can utilize CO 2 The gas is formed by chemical reaction with the molten steel in the molten pool, so that good dynamic conditions are formed, and the stirring effect is improved. Bottom blowing CO currently used in industry on a large scale 2 The bottom blowing gun mainly adopts a circular seam type and a bundling pipe, the bottom blowing strength of the circular seam type bottom blowing gun is high, but the bottom blowing gun is airThe flow is concentrated, and dispersed bubbles are not easy to form; bottom blowing CO of bundling tubes 2 The air current distributes evenly, can form fine stirring effect, but easily takes place to block up, influences life.
Therefore, a bottom blowing gun with good stirring effect and long service life is needed.
Disclosure of Invention
In order to solve the technical problems, the invention provides the bottom blowing gun, the converter and the bottom blowing method, the bottom blowing gun has good stirring effect, is not easy to block and has long service life, and simultaneously, the lining of the converter cannot be corroded, so that the service life of the lining of the converter is prolonged.
The technical scheme of the invention is as follows:
in one aspect, the present invention provides a bottom blowing lance for bottom blowing molten steel in a converter, the bottom blowing lance comprising:
an outer tube;
the inner pipe is coaxially arranged in the outer pipe, and a circular seam for introducing inert gas is arranged between the inner pipe and the outer pipe;
multiple for blowing CO 2 The bottom-blowing pipes are arranged in the inner pipe at intervals and in parallel with the inner pipe, and a refractory material is filled between the inner pipe and the bottom-blowing pipes.
Further, the inner diameter of the bottom blowing pipe is 0.5-3.5mm, and the number of the bottom blowing pipes is 50-100.
Further, the difference between the inner diameter of the outer tube and the outer diameter of the inner tube is 1-2 mm.
Further, the external distance between two adjacent bottom blowing pipes is 5-10 mm.
Further, the inner diameter of the outer tube is 32-50 mm.
Further, the inert gas is at least one of: n is a radical of 2 And Ar.
In a second aspect, the present invention also provides a converter comprising:
the furnace body is provided with an inner cavity;
the bottom blowing gun is arranged at the bottom of the furnace body, and the circular seam and the bottom blowing pipe of the bottom blowing gun are communicated with the inner cavity.
In a third aspect, the present invention also provides a bottom blowing method, which is suitable for the converter, and the method includes:
blowing inert gas to the bottom of the converter body through the circular seam of the bottom blowing gun, and blowing CO to the bottom of the converter body through a plurality of bottom blowing pipes 2 And gas for stirring the molten steel in the converter.
Further, bottom blowing CO 2 The total flow rate of the gas is 500-3000 Nm 3 The flow rate of inert gas blown into the inner bottom is 50-300 Nm 3 /h。
Further, bottom blowing CO in the process that the converter blowing time is less than or equal to 12min 2 The total flow rate of the gas and the inert gas is 500-1500 Nm 3 H; in the process that the converter blowing time is 12-18 minutes, bottom blowing CO 2 The total flow rate of the gas and the inert gas is 1000-3000 Nm 3 /h。
The beneficial effects of the invention at least comprise:
the bottom blowing gun provided by the invention is used for bottom blowing of molten steel in a converter, and comprises an outer pipe, an inner pipe and a bottom blowing pipe, wherein the inner pipe is coaxially arranged in the outer pipe, and a circular seam for introducing inert gas is arranged between the inner pipe and the outer pipe; the bottom blowing pipes are provided with a plurality of bottom blowing pipes for blowing CO 2 And the gas is arranged in the inner pipe at intervals of the plurality of bottom blowing pipes and in parallel with the inner pipe, and the refractory material is filled between the inner pipe and the plurality of bottom blowing pipes. The bottom blowing gun is arranged at the bottom of the converter, the circular seam formed by the outer pipe and the inner pipe is used for introducing inert gas, the inert gas flow is concentrated, the blowing strength is high, the blockage is not easy to occur, and the bottom blowing pipe arranged in the inner pipe is used for blowing CO 2 Gas, since there are a plurality of bottom blowing pipes, CO is blown 2 Gas forms dispersed bubbles after entering molten steel, and CO is increased 2 The contact area of the gas and the molten steel improves the stirring effect of the molten steel. Due to CO 2 The gas is surrounded by the annular column-shaped inert gas blown out from the annular gap, a layer of barrier is formed, and the CO in the gas is prevented 2 Gas diffusion towards the outside, avoiding CO 2 Gas (es)Contact with the lining of a converter which is rotated to the vicinity by bottom blowing, CO is prevented 2 The gas and the carbon element in the converter lining are subjected to chemical reaction, so that the corrosion phenomenon of the converter lining can not occur; the ring-column-shaped concentrated gas flow can also carry away CO 2 FeO and MnO generated by the reaction of the gas and Fe and Mn elements in the molten steel are prevented from contacting with the lining of the converter, but the FeO and the MnO float upwards and enter the slag, so that the service life of the lining of the converter is prolonged. In addition, the ring-column-shaped intensively-sprayed inert gas flow can generate an upward moving flow field near the bottom blowing gun, so that slag in molten steel is prevented from approaching the bottom blowing pipe, the bottom blowing pipe is prevented from being blocked by the slag, and the service life of the bottom blowing brick is prolonged; since the intensity of the annular column-shaped inert gas is weakened along with the increase of the height, the CO is not influenced 2 The gas and the molten steel far away from the bottom blowing gun carry out decarburization reaction. Therefore, the bottom blowing gun has a good stirring effect, is not easy to block, has long service life, cannot corrode the lining of the converter, and prolongs the service life of the lining of the converter.
Drawings
FIG. 1 is a schematic top view of a bottom-blowing lance according to the present embodiment;
fig. 2 is a schematic structural diagram of fig. 1.
Description of reference numerals: 1-bottom blowing gun, 11-outer tube, 12-inner tube, 13-bottom blowing tube and 14-circular seam.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
In the smelting process of the converter, bottom blowing CO is adopted 2 The gas is smelted due to CO 2 The gas is a weakly oxidizing gas, and therefore, CO 2 The carbon in the gas in the molten steel can directly react with the carbon in the lining of the converter while the gas reacts chemically, so that the lining of the converter is corroded; CO 2 2 The gas can also react with Fe and Mn elements in molten steel near the bottom blowing gun to generate FeO and MnO, and the generated FeO and MnO are also contacted with the lining of the converterCan corrode the lining of the converter. Bottom blowing CO 2 The erosion rate of the gas to the converter lining is the commonly used bottom blowing inert gas N 2 Or about 1.5 times Ar.
Fig. 1 and 2 show the structure of a bottom blowing gun, and in combination with fig. 1 and 2, in one aspect, the embodiment of the invention provides a bottom blowing gun for bottom blowing molten steel in a converter, wherein the bottom blowing gun 1 comprises an outer tube 11, an inner tube 12 and a bottom blowing tube 13, the inner tube 12 is coaxially arranged in the outer tube 11, and an annular seam 14 for introducing inert gas is arranged between the inner tube 12 and the outer tube 11; a plurality of bottom blowing pipes 13 are arranged, and the plurality of bottom blowing pipes 13 are used for blowing CO 2 The gas is provided in the inner pipe 12 at intervals and in parallel with the inner pipe 12 in the plurality of bottom blowing pipes 13, and a refractory material is filled between the inner pipe 12 and the plurality of bottom blowing pipes 13.
The bottom blowing lance 1 is arranged at the bottom of the converter, the annular seam 14 formed by the outer pipe 11 and the inner pipe 12 is used for introducing inert gas, the inert gas flow is concentrated, the blowing strength is high, and the blockage is not easy to occur, and the bottom blowing pipe 13 arranged in the inner pipe 12 is used for blowing CO 2 Gas, CO being blown by the plurality of bottom blowing pipes 13 2 Gas forms dispersed bubbles after entering molten steel, and CO is increased 2 The contact area of the gas and the molten steel improves the stirring effect of the molten steel. Due to CO 2 The gas is surrounded by the annular column of inert gas blown out of the annular gap 14, which forms a barrier to the internal CO 2 Gas diffusion towards the outside, avoiding CO 2 The gas contacts with the lining of the converter which is blown from the bottom to the nearby place, and CO is prevented 2 The gas and the carbon element in the converter lining are subjected to chemical reaction, so that the corrosion phenomenon of the converter lining can not occur; the ring-column-shaped concentrated gas flow can also carry away CO 2 FeO and MnO generated by the reaction of the gas and Fe and Mn elements in the molten steel are prevented from contacting with the lining of the converter, but the FeO and the MnO float upwards and enter the slag, so that the service life of the lining of the converter is prolonged. In addition, the ring-column-shaped intensively-sprayed inert gas flow can generate an upward moving flow field near the bottom blowing gun 1, so that slag in molten steel is prevented from approaching the bottom blowing pipe 13, the bottom blowing pipe 13 is prevented from being blocked by the slag, and the service life of the bottom blowing brick is prolonged; due to inert gas in the form of a ring of cylindersThe strength is reduced with the increase of the height, so that the CO is not influenced 2 The gas and the molten steel far away from the bottom blowing lance 1 carry out decarburization reaction. Therefore, the bottom blowing gun 1 has a good stirring effect, is not easy to block and has long service life, and meanwhile, the lining of the converter cannot be corroded, so that the service life of the lining of the converter is prolonged; in addition, CO 2 The chemical reaction of the gas and the carbon in the molten steel is an endothermic reaction, which can locally reduce the temperature of the molten steel and protect refractory materials near a bottom blowing gun at the bottom of the converter.
Further, in the present embodiment, the inner diameter of the bottom blowing pipe 13 may be 0.5 to 3.5mm, and the number of the bottom blowing pipes 13 may be 50 to 100. The internal diameter of the bottom blowing pipe 13 is too large, the gravity of the molten steel can overcome the surface tension and leak from the bottom blowing pipe 13, and the internal diameter of the bottom blowing pipe 13 is too small, so that the bottom blowing of CO can be influenced 2 The flow of the gas reduces the bottom blowing stirring effect. The excessive quantity of the bottom blowing pipes 13 can cause the oversize of the bottom blowing guns 1, the range of the bottom blowing guns influencing the bottom of the converter is wider, and the corrosion influence range is larger.
Further, in this embodiment, the difference between the inner diameter of the outer tube 11 and the outer diameter of the inner tube 12 is larger than the inner diameter of the bottom-blowing tube 13, that is, the difference between the inner diameter and the outer diameter of the circular seam 14, or the radial width of the circular seam 14 is larger than the inner diameter of the bottom-blowing tube 13, so that the annular inert gas blown from the bottom of the circular seam 14 forms an effective protective barrier to avoid the central CO 2 Gas escapes from the barrier; in addition, an upward flow field can be formed near the bottom blowing gun 1, so that slag in molten steel is prevented from blocking the bottom blowing pipe 13.
In particular, in this embodiment, the outer distance between two adjacent bottom blowing pipes may be 5-10 mm.
More specifically, the difference between the inner diameter of the outer tube 11 and the outer diameter of the inner tube 12 is 1 to 2mm, that is, the difference between the outer diameter and the inner diameter of the annular gap 14 is 1 to 2mm, and it can be understood that the width of the annular gap 14 is 1 to 2mm, and the difference is too large, which may cause the molten steel to leak out from the annular gap 14, and the difference is too small, which may reduce the bottom blowing flow rate of the inert gas, thereby making it difficult to form the protection center CO 2 Barrier of gas, CO 2 The gas may diffuse out of the annular column of inert gas,the chemical reaction is carried out with the converter lining near the bottom blowing gun 1 to generate corrosion, thereby reducing the service life of the converter lining; in addition, slag in the molten steel may reach the bottom blowing pipe 13 to block the bottom blowing pipe 13, thereby reducing the service life of the bottom blowing lance 1.
More specifically, in the present embodiment, the inner diameter of the outer tube 11 may be 32-50 mm.
The inner tube 12, the outer tube 11 and the bottom blowing tube 13 can all be metal tubes, and magnesia carbon bricks can be selected as refractory materials between the inner tube 12 and the bottom blowing tube 13. The inert gas bottom blown in the annular gap 14 may be, but is not limited to, at least one of: n is a radical of hydrogen 2 And Ar.
In a second aspect, the embodiment of the present invention further provides a converter, which includes a furnace body and the bottom blowing lance 1, wherein the furnace body is provided with an inner cavity for containing molten steel, the bottom blowing lance 1 is arranged at the bottom of the furnace body, and both the circular seam 14 and the bottom blowing pipe 13 of the bottom blowing lance 1 are communicated with the inner cavity, so that inert gas in the circular seam 14 and CO in the bottom blowing pipe 13 can be smoothly introduced into the inner cavity 2 And blowing the gas into a molten pool of the furnace body to stir the molten steel.
In a third aspect, an embodiment of the present invention further provides a bottom blowing method, which is applicable to the converter described above, and the method includes:
blowing inert gas to the bottom of the converter body through the circular seam 14 of the bottom blowing lance 1, and blowing CO to the bottom of the converter body through a plurality of bottom blowing pipes 13 2 Gas to stir the molten steel in the converter.
Further, in the present embodiment, bottom blowing of CO 2 The total flow rate of the gas is 500-3000 Nm 3 The flow rate of inert gas blown into the inner bottom is 50-300 Nm 3 /h。
Furthermore, in the present embodiment, during the blowing time of the converter being less than or equal to 12min, bottom blowing CO 2 The total flow rate of the gas and the inert gas is 500-1500 Nm 3 H; in the process that the converter blowing time is 12-18 min, bottom blowing CO 2 The total flow rate of the gas and the inert gas is 1000-3000 Nm 3 /h。
The bottom blowing method provided by the present invention will be further described with reference to specific examples.
Example 1
Example 1 provides a converter having a capacity of 300t, comprising a body and a bottom blowing lance 1 provided at the bottom of the furnace bottom, wherein the inner diameter of a bottom blowing pipe 13 using the bottom blowing lance 1 is 1mm, the number of the bottom blowing pipes 13 is 80, the radial width of a circumferential seam 14 is 1.5mm, and the inner diameter of an outer pipe 11 is 40 mm.
The converter is used for smelting molten iron, and the smelting is divided into three stages, namely a first stage, bottom blowing CO 2 The total flow rate of gas was 500Nm 3 H, bottom blowing N 2 The flow rate is 1000Nm 3 H; second stage, bottom blowing CO 2 Total flow rate of gas was 3000Nm 3 H; third stage, bottom blowing CO 2 The total flow rate of the gas is 1000Nm 3 H, bottom-blown Ar flow 2000Nm 3 /h。
Example 2
Example 2 provides a converter having a capacity of 200t, comprising a body and a bottom blowing lance 1 provided at the bottom of the furnace bottom, wherein the inner diameter of a bottom blowing pipe 13 using the bottom blowing lance 1 is 1.8mm, the number of the bottom blowing pipes 13 is 70, the radial width of a circumferential seam 14 is 1mm, and the inner diameter of an outer pipe 11 is 36 mm.
The converter is used for smelting molten iron, and the smelting is divided into three stages, namely a first stage, bottom blowing CO 2 The total flow rate of gas being 300Nm 3 H, bottom blowing N 2 The flow rate was 700Nm 3 H; second stage, bottom blowing CO 2 The total flow rate of gas was 2500Nm 3 H; third stage, bottom blowing CO 2 The total flow rate of gas was 800Nm 3 The flow rate of bottom-blown Ar is 1500Nm 3 /h。
Example 3
Example 3 provides a converter having a capacity of 260t, comprising a body and a bottom blowing lance 1 provided at the bottom of the furnace bottom, wherein the inner diameter of a bottom blowing pipe 13 using the bottom blowing lance 1 is 2.5mm, the number of the bottom blowing pipes 13 is 60, the radial width of a circumferential seam 14 is 2mm, and the inner diameter of an outer pipe 11 is 45 mm.
The converter is used for smelting molten iron, and the smelting is divided into three stages, namely a first stage and a bottom stageBlowing CO 2 The total flow rate of gas was 800Nm 3 H, bottom blowing N 2 The flow rate is 1000Nm 3 H; second stage, bottom blowing CO 2 The total flow rate of gas was 2800Nm 3 H; third stage, bottom blowing CO 2 The total flow rate of gas being 900Nm 3 The flow rate of bottom-blown Ar is 1500Nm 3 /h。
Comparative example 1
Comparative example 1A converter with a ring-gap 14 type bottom lance 1 is provided, the ring-gap 14 of the ring-gap 14 type bottom lance 1 being blown with CO 2 The mixed gas of (1).
Comparative example 2
Comparative example 2 provides a converter with a bottom-blowing lance 1 for a bundled tube into which CO is blown 2 The mixed gas of (1).
Comparative example 3
The bottom blowing gun 1 in the converter provided by the comparative example 3 is a circular seam 14 type bottom blowing gun 1, the bottom blowing gun 1 blows nitrogen in the middle and early stages of converter smelting, and the bottom blowing gun 1 blows Ar gas in the later stages of converter smelting.
Comparative example 4
The bottom blowing lance 1 in the converter provided by the comparative example 4 is a bundling pipe type bottom blowing lance 1, the bottom blowing lance 1 blows nitrogen in the early stage of converter smelting, and the bottom blowing lance 1 blows Ar gas in the later stage of converter smelting.
Comparative example 5
Comparative example 5 comparative example 1 and comparative example 5 example 1 was different in that nitrogen gas was blown into the circumferential seams 14 of the bottom-blowing lance 1 and the middle and front stages of the bottom-blowing bricks, and argon gas was blown into the circumferential seams 14 and the bottom-blowing bricks in the later stage of the smelting.
Comparative example 6
Comparative example 6 comparative example 1 and comparative example 5 comparative example 1 differ from each other in that nitrogen gas was blown into the circumferential seams 14 of the bottom-blowing lance 1 and the middle and front stages of the bottom-blowing bricks, and argon gas was blown into the circumferential seams 14 and the bottom-blowing bricks in the later stage of the smelting.
TABLE 1
From table 1, it can be seen that:
after smelting by using the bottom blowing lance provided in the embodiments 1 to 4, the erosion rate of the lining at the bottom of the converter is 0.08-0.10 mm/furnace, the service life of the bottom blowing lance is 6704-7509 furnace, the nitrogen content at the end point of the converter is 9-12.8ppm, and the carbon oxygen content is 0.00143-0.0018.
Comparative example 1 bottom blowing was carried out using a circular seam bottom blowing lance, the erosion rate of the converter bottom lining was 0.19 mm/furnace, the service life of the bottom blowing lance was 4195 furnace, which is lower than examples 1 to 4, the nitrogen content was 13ppm, and the carbon oxygen product was 0.0015.
Comparative example 2 bottom blowing was carried out using a cluster pipe bottom blowing lance, the erosion rate of the converter bottom lining was 0.22 mm/furnace, the service life of the bottom blowing lance was 3620 furnaces, which are lower than those of examples 1 to 4, the nitrogen content at the converter end point was 12, and the carbon oxygen product was 0.0016.
Comparative example 3 bottom blowing was carried out using a circular seam bottom blowing lance, the erosion rate of the lining at the bottom of the converter was 0.12 mm/furnace, the service life of the bottom blowing lance was 6072 furnace, which is lower than that of examples 1 to 4, because the circular seam bottom blowing lance has too large an air flow to easily erode the lining of the converter, the nitrogen content at the end of the converter was 16ppm, which was higher than that of examples 1 to 4, and the carbon oxygen deposition was 0.0019.
Comparative example 4 using a cluster pipe as a bottom blowing lance, the erosion rate of the lining at the bottom of the converter was 0.13 mm/furnace, and the service life of the bottom blowing lance was 5988 furnaces, which are lower than those of examples 1 to 4, because the cluster pipe is easily clogged, and the bottom of the converter needs to be lowered in order to recover bottom blowing after clogging; the nitrogen content at the converter end point was 15ppm, which is higher than in examples 1 to 4, and the carbon oxygen product was 0.0016.
Comparative example 5 bottom blowing was carried out using the same bottom blowing gun as in the inventive example, and N was blown both from the circular seam and from the bottom blowing pipe 2 Or Ar, the erosion rate of the converter bottom lining is 0.12 mm/furnace, the service life of the bottom blowing lance is 6856 furnace, the service life is lower than that of the examples 1 to 4, the nitrogen content at the converter end point is 17.9ppm and is higher than that of the examples 1 to 4, and the carbon oxygen product is 0.0016.
Comparative example 6 bottom blowing was carried out using the same bottom blowing gun as in the inventive example, and N was blown from both the circumferential weld and the bottom blowing pipe 2 Or Ar, the erosion rate of the converter bottom lining is 0.13 mm/furnace, the service life of the bottom blowing gun is 6963 furnace, the service life is lower than that of the examples 1 to 4, the nitrogen content at the end point of the converter is 17.1ppm and is higher than that of the examples 1 to 4, and the carbon oxygen product is 0.0016.
The bottom blowing gun 1 of the invention adopts a double-air chamber structure, namely, the inert gas flow with the outer part being a ring column and the center being CO 2 The inert gas stream of the gas, ring column, can form CO 2 A protective barrier for gas to avoid oxidizing gas CO 2 The slag is directly contacted with refractory materials at the bottom of the converter to be corroded, so that a bottom blowing pipe 13 is prevented from being blocked, and the stirring effect in the converter is ensured; the utility model adopts a double-air chamber structure, the inner ring adopts a thin metal tube structure, the outer ring adopts a circular seam 14 structure, and the inner thin metal tube structure blows in weak oxidizing gas CO 2 A large amount of heat absorption protection refractory materials, and N is blown into the outer ring circumferential seam 14 2 Ar gas forming an inert gas flow barrier encasing the oxidizing CO 2 Gas, avoiding CO 2 Directly contacting with the inner lining of the converter bottom. In addition, the bottom blowing gun 1 is reasonable in structure, simple to machine and maintain and long in service life, and can replace the traditional circular seam 14 bottom blowing gun 1 and the micropore metal tube bottom blowing gun 1.
While the preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. The utility model provides a bottom blowing rifle for the molten steel in the converter carries out bottom blowing, its characterized in that, bottom blowing rifle includes:
an outer tube;
the inner pipe is coaxially arranged in the outer pipe, and a circular seam for introducing inert gas is arranged between the inner pipe and the outer pipe;
multiple for blowing CO 2 The bottom-blowing pipes are arranged in the inner pipe at intervals and in parallel with the inner pipe, and a refractory material is filled between the inner pipe and the bottom-blowing pipes.
2. The bottom blowing gun according to claim 1, wherein an inner diameter of the bottom blowing pipe is 0.5 to 3.5mm, and the number of the bottom blowing pipes is 50 to 100.
3. The bottom blowing gun according to claim 1, wherein the difference between the inner diameter of the outer tube and the outer diameter of the inner tube is 1-2 mm.
4. The bottom blowing gun according to claim 1, characterized in that the outer distance between two adjacent bottom blowing tubes is 5-10 mm.
5. The bottom blowing gun according to claim 1, wherein the outer tube has an inner diameter of 32-50 mm.
6. The bottom blowing gun according to claim 1, wherein the inert gas is at least one of: n is a radical of 2 And Ar.
7. A converter, characterized by comprising:
the furnace body is provided with an inner cavity;
the bottom blowing lance defined in any one of claims 1 to 6 is located at the bottom of the vessel body and the circular seam and the bottom blowing tube of the bottom blowing lance are both in communication with the internal cavity.
8. A bottom blowing method applied to the converter defined in claim 7, the method comprising:
blowing inert gas to the bottom of the converter body through the circular seam of the bottom blowing gun, and blowing CO to the bottom of the converter body through a plurality of bottom blowing pipes 2 And gas for stirring the molten steel in the converter.
9. The bottom blowing method according to claim 8, wherein the bottom blowing CO is 2 The total flow rate of the gas is 500-3000 Nm 3 The flow rate of inert gas blown into the inner bottom is 50-300 Nm 3 /h。
10. The bottom blowing method of claim 8, wherein the bottom blowing CO is performed in the process that the converter blowing time is less than or equal to 12min 2 The total flow rate of the gas and the inert gas is 500-1500 Nm 3 H; in the process that the converter blowing time is 12-18 min, bottom blowing CO 2 The total flow rate of the gas and the inert gas is 1000-3000 Nm 3 /h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210683964.5A CN115044735B (en) | 2022-06-16 | Bottom blowing gun, converter and bottom blowing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210683964.5A CN115044735B (en) | 2022-06-16 | Bottom blowing gun, converter and bottom blowing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115044735A true CN115044735A (en) | 2022-09-13 |
| CN115044735B CN115044735B (en) | 2024-05-10 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4334921A (en) * | 1979-04-16 | 1982-06-15 | Nippon Steel Corporation | Converter steelmaking process |
| JP2016199788A (en) * | 2015-04-10 | 2016-12-01 | Ｊｆｅスチール株式会社 | Bottom-blown tuyere for converter |
| CN111500815A (en) * | 2020-05-28 | 2020-08-07 | 北京科技大学 | Bottom blowing O2-CO2Dynamic control method for steelmaking process of CaO converter |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4334921A (en) * | 1979-04-16 | 1982-06-15 | Nippon Steel Corporation | Converter steelmaking process |
| JP2016199788A (en) * | 2015-04-10 | 2016-12-01 | Ｊｆｅスチール株式会社 | Bottom-blown tuyere for converter |
| CN111500815A (en) * | 2020-05-28 | 2020-08-07 | 北京科技大学 | Bottom blowing O2-CO2Dynamic control method for steelmaking process of CaO converter |
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