CN115232911B - Hot air spray gun for steelmaking and converting process thereof - Google Patents
Hot air spray gun for steelmaking and converting process thereof Download PDFInfo
- Publication number
- CN115232911B CN115232911B CN202210688469.3A CN202210688469A CN115232911B CN 115232911 B CN115232911 B CN 115232911B CN 202210688469 A CN202210688469 A CN 202210688469A CN 115232911 B CN115232911 B CN 115232911B
- Authority
- CN
- China
- Prior art keywords
- hot air
- spray gun
- oxygen
- gun body
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000007921 spray Substances 0.000 title claims abstract description 76
- 238000009628 steelmaking Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000008569 process Effects 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 58
- 239000001301 oxygen Substances 0.000 claims abstract description 58
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 239000000498 cooling water Substances 0.000 claims abstract description 23
- 238000002485 combustion reaction Methods 0.000 claims abstract description 14
- 239000011819 refractory material Substances 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 11
- 238000004873 anchoring Methods 0.000 claims description 8
- 239000010410 layer Substances 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 239000011241 protective layer Substances 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical group [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 38
- 229910052742 iron Inorganic materials 0.000 abstract description 19
- 239000010959 steel Substances 0.000 abstract description 15
- 229910000831 Steel Inorganic materials 0.000 abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- 230000036284 oxygen consumption Effects 0.000 abstract description 3
- 238000003723 Smelting Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- -1 scrap Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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
-
- 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
- C21C5/305—Afterburning
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The utility model relates to a hot air spray gun for steelmaking and a converting process thereof, wherein the hot air spray gun comprises a spray gun body, a water cooling sleeve and a flow guiding structure; the inner cavity of the spray gun body is a hot air channel, and a hot air inlet is arranged on the spray gun body; the outer side of the spray gun body is provided with a water cooling sleeve which is provided with a cooling water inlet and a cooling water outlet; the flow guiding structure consists of a flow guiding rod and a flow guiding head. The utility model utilizes the hot air spray gun to spray oxygen-enriched hot air into the furnace, and the oxygen-enriched hot air and CO are fully mixed and combusted to release heat, so that the secondary combustion efficiency can be effectively improved, the unnecessary oxygen consumption can be reduced, the steel scrap adding amount during steelmaking can be increased, the molten iron adding amount can be reduced, and the aims of increasing yield and reducing carbon are realized.
Description
Technical Field
The utility model relates to the technical field of steelmaking, in particular to a hot air spray gun for steelmaking and a converting process thereof.
Background
In the whole process of iron and steel production, the carbon emission of the iron making process is at least more than 70%, the productivity of the iron making process is reduced, the yield of molten iron is reduced, and the carbon emission of the iron and steel industry can be greatly reduced. For converter steelmaking, the mode adopted at present is a smelting mode of converting the past full molten iron smelting into molten iron and scrap steel, so that the carbon emission can be reduced, and the molten steel yield can be improved. However, in the converter steelmaking production process, excessive scrap steel is added to cause lower converter temperature and influence normal production; how to improve the scrap ratio and reduce the use amount of molten iron is a problem to be solved.
Currently, the technical literature concerning the improvement of scrap ratio and the reduction of carbon emissions is exemplified as follows:
the Chinese patent with publication number of CN207811790U discloses a double-flow double-combustion oxygen lance nozzle, 3 oxygen through holes are arranged on the oxygen lance nozzle, 2 oxygen through holes are arranged on the side surface of the nozzle, and the oxygen lance nozzle can rapidly raise the temperature in a steelmaking molten pool and reduce energy consumption under the condition of low molten iron temperature or low molten iron quantity. However, this structure has a small flow rate, and thus has a small combustion area, resulting in a low post-combustion rate.
The Chinese patent publication No. CN112708724B discloses a steelmaking device and a steelmaking method using scrap steel, which are improved on the existing electric arc furnace, and have the advantages of realizing uniform distribution of cold materials according to the particle size, improving the operation safety performance during mechanical movements such as rotation and prolonging the service life of the device. But the device is only suitable for occasions of melting scrap steel by electrifying and has larger energy consumption.
Chinese patent application publication No. CN114058768A discloses a "converter smelting method for increasing the scrap ratio of a converter", in which lime, scrap, coke, residual refractory materials and the like are mixed to be heated by oxygen blowing, and molten iron is added to be smelted. After fully and uniformly mixing, the reaction is more complete, the scrap steel is easier to melt, and the converter scrap steel ratio can be improved to 35-40%. However, extra oxygen is required to be consumed additionally by adopting the method, the process flow is added, and the whole smelting rhythm is reduced.
Disclosure of Invention
The utility model provides a hot air spray gun for steelmaking and a converting process thereof, wherein the hot air spray gun is used for spraying oxygen-enriched hot air into a furnace, the oxygen-enriched hot air and CO are fully mixed and combusted to release heat, the secondary combustion efficiency can be effectively improved, the unnecessary oxygen consumption is reduced, the steel scrap adding amount during steelmaking can be improved, the molten iron adding amount is reduced, and the aims of increasing yield and reducing carbon are fulfilled.
In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:
a hot air spray gun for steelmaking comprises a spray gun body, a water cooling sleeve and a flow guiding structure; the spray gun body is in a straight pipe shape, a nozzle is arranged at one end of the head of the spray gun body, and one end of the tail of the spray gun body is in a closed structure; the inner cavity of the spray gun body is a hot air channel, and a hot air inlet is arranged on the spray gun body; the outer side of the spray gun body is provided with a water cooling sleeve which is provided with a cooling water inlet and a cooling water outlet; the flow guide structure consists of a flow guide rod and a flow guide head, and the flow guide rod is arranged in the middle of the spray gun body and is axially and longitudinally arranged along the spray gun body; the end part of the flow guide rod corresponding to one end of the nozzle is provided with a flow guide head, and the flow guide head protrudes out of the nozzle and is of a mushroom-shaped structure; an annular flow passage is arranged between the flow guide head and the nozzle.
The number of the hot air inlets is 2, and the hot air inlets are all close to one end of the tail part of the gun body and are oppositely arranged at two sides of the spray gun body.
The hot air inlet is provided with a hot air inlet pipe, the hot air inlet pipe is vertically intersected with the spray gun body, and the outer end of the hot air inlet pipe is provided with a connecting flange.
The middle part of the water cooling jacket is longitudinally provided with a water stop plate, so that the inner space of the water cooling jacket is divided into a water inlet channel and a water return channel; one end of the water inlet channel is connected with the cooling water inlet, the other end of the water inlet channel is communicated with the corresponding end of the water return channel, and the other end of the water return channel is connected with the cooling water outlet.
The tail part of the gun body is sealed by an end sealing plate, and the end sealing plate is connected with the spray gun body by a flange; one end of the flow guide rod, which is far away from the flow guide head, is fixedly connected with the end sealing plate.
The guide rod consists of a guide rod body, a refractory material protection layer and an anchoring structure; the outside of guide bar body establishes the refractory material inoxidizing coating, and the refractory material inoxidizing coating passes through anchor structure and guide bar body fixed connection.
The guide rod body is made of stainless steel; the guide head is made of refractory materials, and the guide head and the refractory material protective layer are of an integrated structure; the refractory material adopted by the diversion head and the refractory material protective layer is silicon carbide.
The anchoring structure consists of a plurality of rows of rivets and corresponding circular ring supports, wherein the rows of rivets and the corresponding circular ring supports are uniformly arranged along the axial direction and the circumferential direction of the guide rod, and the circular ring supports are fixedly connected with the guide rod body through the corresponding rivets.
An oxygen-enriched hot air entering a hot air spray gun through a hot air inlet is buffered by an opposite hot air inlet pipe and then flows to a nozzle; the temperature of the oxygen-enriched hot air is controlled to be 500-1200 ℃, the inlet flow rate of the oxygen-enriched hot air is 90-110 m/s, and the outlet flow rate of the oxygen-enriched hot air at the nozzle is 350-400 m/s; the temperature difference between the water inlet and the water return in the water cooling jacket is not more than 15 ℃, and the average flow speed of the cooling water is not less than 10m/s; the oxygen-enriched hot air flows out from the spray opening in an umbrella shape under the action of the flow guide head; after entering the furnace, the oxygen-enriched hot air is mixed with CO gas rising in the furnace to carry out secondary combustion heat release, an oxidation heat release area is formed in the upper area in the furnace, and heat is transferred to a lower molten pool through heat transfer between gases, so that the temperature of the molten pool is increased.
The 2 hot air inlets are used as a buffer chamber for oxygen-enriched hot air entering from the hot air inlet in a working state.
Compared with the prior art, the utility model has the beneficial effects that:
oxygen-enriched hot air is blown into the furnace by using the hot air spray gun, and the oxygen-enriched hot air and CO are fully mixed and combusted to release heat, so that the secondary combustion efficiency can be effectively improved, the unnecessary oxygen consumption is reduced, the steel scrap adding amount during steelmaking can be increased, the molten iron adding amount is reduced, and the aims of increasing yield and reducing carbon are fulfilled.
Drawings
Fig. 1 is a schematic structural view of the hot air spray gun of the present utility model.
Fig. 2 is an enlarged view of a portion of the nozzle of the hot air gun according to the present utility model.
Fig. 3 is a schematic diagram of the converting process according to the utility model.
In the figure: 1. the spray gun body 11, the hot air inlet 2, the guide structure 21, the guide rod 22, the guide head 3, the water cooling jacket 31, the cooling water inlet 32, the cooling water outlet 33, the water return channel 34, the water inlet channel 35, the water baffle 4, the refractory material protection layer 5, the anchoring structure I, the hot air spray gun II, the converter III, the molten pool IV and the bottom oxygen-blowing nozzle
Detailed Description
The following is a further description of embodiments of the utility model, taken in conjunction with the accompanying drawings:
as shown in fig. 1 and 2, the hot air spray gun for steelmaking comprises a spray gun body 1, a water cooling jacket 3 and a diversion structure 2; the spray gun body 1 is in a straight pipe shape, a nozzle is arranged at one end of the head of the spray gun body, and one end of the tail of the spray gun body is in a closed structure; the inner cavity of the spray gun body 1 is a hot air channel, and a hot air inlet 11 is arranged on the spray gun body 1; the outer side of the spray gun body 1 is provided with a water cooling sleeve 3, and the water cooling sleeve 3 is provided with a cooling water inlet 31 and a cooling water outlet 32; the flow guide structure 2 consists of a flow guide rod 21 and a flow guide head 22, wherein the flow guide rod 21 is arranged in the middle of the spray gun body 1 and is axially and longitudinally arranged along the spray gun body 1; the end part of the flow guide rod 21 corresponding to one end of the nozzle is provided with a flow guide head 22, and the flow guide head 22 protrudes out of the nozzle and is of a mushroom-shaped structure; an annular flow passage is arranged between the flow guiding head 22 and the nozzle.
The number of the hot air inlets 11 is 2, and the hot air inlets are all close to one end of the tail of the gun body and are oppositely arranged on two sides of the spray gun body 1.
The hot air inlet 11 is provided with a hot air inlet pipe which is vertically intersected with the spray gun body 1, and the outer end of the hot air inlet pipe is provided with a connecting flange.
The middle part of the water cooling jacket 3 is longitudinally provided with a water stop plate 35 which divides the internal space of the water cooling jacket 3 into a water inlet channel 34 and a water return channel 33; one end of the water inlet channel 34 is connected with the cooling water inlet 31, the other end of the water inlet channel 34 is communicated with the corresponding end of the water return channel 33, and the other end of the water return channel 33 is connected with the cooling water outlet 32.
The tail part of the gun body is sealed by an end sealing plate, and the end sealing plate is connected with the spray gun body 1 by a flange; one end of the flow guide rod 21, which is far away from the flow guide head 22, is fixedly connected with an end sealing plate.
The guide rod 21 consists of a guide rod body, a refractory material protection layer 23 and an anchoring structure 24; the outside of the guide rod body is provided with a refractory material protection layer 23, and the refractory material protection layer 23 is fixedly connected with the guide rod body through an anchoring structure 24.
The guide rod body is made of stainless steel; the guide head 22 is made of refractory material, and the guide head 22 and the refractory material protection layer 23 are of an integrated structure; the refractory material used for the deflector 22 and the refractory protection layer 23 is silicon carbide.
The anchoring structure 24 is composed of a plurality of rows of rivets and corresponding circular ring supports, wherein the rows of rivets and the corresponding circular ring supports are uniformly arranged along the axial direction and the circumferential direction of the guide rod 21, and the circular ring supports are fixedly connected with the guide rod body through the corresponding rivets.
As shown in figure 3, in the converting process for steelmaking, oxygen-enriched hot air entering a hot air spray gun I through a hot air inlet 11 is buffered by an opposite hot air inlet pipe and then flows to a nozzle; the temperature of the oxygen-enriched hot air is controlled to be 500-1200 ℃, the inlet flow rate of the oxygen-enriched hot air is 90-110 m/s, and the outlet flow rate of the oxygen-enriched hot air at the nozzle is 350-400 m/s; the temperature difference between the water inlet and the water return in the water cooling sleeve 3 is not more than 15 ℃, and the average flow speed of the cooling water is not less than 10m/s; the oxygen-enriched hot air flows out from the nozzle in an umbrella shape under the action of the flow guide head 22; after entering the furnace, the oxygen-enriched hot air is mixed with CO gas rising in the furnace to carry out secondary combustion heat release, an oxidation heat release area is formed in the upper area in the furnace, and heat is transferred to a lower molten pool III through heat transfer between gases, so that the temperature of the molten pool III is increased.
The 2 hot air inlets 11 are provided for one time, and the standby hot air inlet pipe is used as a buffer chamber for oxygen-enriched hot air entering from the hot air inlet in a working state.
The common steelmaking equipment comprises a converter and an electric furnace, wherein molten iron, scrap steel and iron alloy are used as main raw materials in converter steelmaking, and the steelmaking process is completed in the converter by utilizing the physical heat of the molten iron and the chemical reaction between molten iron components without using external energy. The parts of the converter, into which the gas is blown, are top blowing, bottom blowing and side blowing, and the gas type is classified into an air converter and an oxygen converter. The hot air spray gun is mainly applied to a top-blown converter and a bottom-blown converter, is arranged at a furnace mouth at the top, is additionally arranged on the basis of a top-blown oxygen gun for the top-blown converter, and is independently arranged for the bottom-blown converter (as shown in figure 3, a bottom-blown oxygen nozzle IV is arranged at the bottom of the bottom-blown converter, and a hot air spray gun I is arranged at the top).
The principle of the converting process of the utility model is as follows: in a metallurgical reactor (such as a converter II) filled with high-temperature molten iron, CO is generated by oxidation reaction of the injected oxygen and [ C ] in a molten pool III, and the rising CO and sufficient oxygen-enriched hot air generate oxidation reaction heat release. Compared with the traditional oxygen converter steelmaking process, the utility model sprays oxygen-enriched hot air into the furnace body through the hot air spray gun I, strengthens the secondary combustion rate in the furnace, and utilizes heat transfer between gases in the furnace to raise the temperature of a molten pool, thereby increasing the addition amount of scrap steel, reducing the addition amount of molten iron and realizing the purposes of increasing yield and reducing carbon.
The following examples are given by way of illustration of detailed embodiments and specific procedures based on the technical scheme of the present utility model, but the scope of the present utility model is not limited to the following examples. The methods used in the examples described below are conventional methods unless otherwise specified.
[ example ]
In the embodiment, a 100t converter is adopted for steelmaking, the converter mouth is adaptively modified, a hot air spray gun is additionally arranged on the basis of a top-blown oxygen gun device, and oxygen-enriched hot air is blown while oxygen is blown.
As shown in fig. 1 and 2, in this embodiment, a hot air spray gun for steelmaking includes a spray gun body, a water cooling jacket and a diversion structure, the outside of the spray gun body is provided with the water cooling jacket, one end of the water cooling jacket is provided with a cooling water inlet and a cooling water outlet, a water-stop plate is arranged inside the water cooling jacket to form a water inlet channel and a water return channel, and the cooling water firstly takes away the heat of the head of the spray gun body and then takes away the heat of the outer wall of the spray gun body.
The water conservancy diversion structure comprises water conservancy diversion pole and water conservancy diversion head, and in this embodiment, the material of water conservancy diversion pole adopts 304 stainless steel, and the surface of water conservancy diversion pole sets up multirow, multiseriate anchor structure (including rivet and ring support) according to 100mm interval for fixed outside refractory material inoxidizing coating, the main component of refractory material inoxidizing coating is the carborundum, is used for resisting the washing of oxygen boosting hot-blast, can prolong the life of water conservancy diversion structure. The flow guide head at one end of the nozzle is mushroom-shaped (with a spherical outer convex surface, and the spherical outer convex surface is in transitional connection with the flow guide rod through a cone section) and is used for adjusting the outflow state of the oxygen-enriched hot air to enable the oxygen-enriched hot air to be sprayed out of the nozzle in an umbrella shape, so that the oxygen-enriched hot air is prevented from directly impacting a lower molten pool, and an oxidation zone is formed at the upper part of the molten pool after the oxygen-enriched hot air enters the furnace.
In the embodiment, 2 hot air inlets are formed in the spray gun body, a one-to-one replacement mechanism is adopted, the relative positions of the 2 hot air inlets are changed, and when oxygen-enriched hot air enters from one side, a spare hot air inlet pipe plays a role in buffering, so that the scouring of the oxygen-enriched hot air to the inner wall of the spray gun body can be reduced.
In the embodiment, the oxygen-enriched hot air entering the spray gun body flows downwards after being buffered by the opposite hot air inlet pipe, the flow speed is about 100m/s, and the outlet flow speed of the oxygen-enriched hot air is about 300m/s under the condition of meeting the working condition pressure; the oxygen-enriched hot air flows out in umbrella shape under the action of the flow guide head, and the temperature of the hot air is controlled at 800 ℃.
Because the inner wall and the outer wall of the spray gun body are both flushed by high-temperature gas and are required to be forcedly cooled by the water cooling sleeve, in the embodiment, the temperature difference between water inlet and water return of the water cooling sleeve is controlled to be 12 ℃, the average flow rate of cooling water is 15m/s, and dead zone conditions are not allowed to exist in local areas.
After entering the furnace body, the oxygen-enriched hot air carries out secondary combustion heat release with ascending CO, an oxidation heat release area is formed in the upper area in the furnace body, and heat is transferred to a lower molten pool through heat transfer between gases, so that the temperature of the molten pool is increased. This heat transfer is feasible as demonstrated by Hismelt process practice.
In general, the secondary combustion rate of oxygen jet flow is only about 30% in steelmaking, and in the embodiment, through arranging the hot air spray gun, oxygen-enriched hot air and CO are fully mixed and combusted, so that the combustion efficiency is improved, and the secondary combustion rate is improved to 60%.
In the embodiment, the hot air spray gun runs 53 heats in total, the average scrap steel adding amount of each heat is increased from 21% to 35% before transformation, and the running effect is obvious.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (6)
1. The blowing process for steelmaking is realized based on a hot air spray gun and is characterized in that the hot air spray gun comprises a spray gun body, a water cooling sleeve and a diversion structure; the spray gun body is in a straight pipe shape, a nozzle is arranged at one end of the head of the spray gun body, and one end of the tail of the spray gun body is in a closed structure; the inner cavity of the spray gun body is a hot air channel, and a hot air inlet is arranged on the spray gun body; the outer side of the spray gun body is provided with a water cooling sleeve which is provided with a cooling water inlet and a cooling water outlet; the flow guide structure consists of a flow guide rod and a flow guide head, and the flow guide rod is arranged in the middle of the spray gun body and is axially and longitudinally arranged along the spray gun body; the end part of the flow guide rod corresponding to one end of the nozzle is provided with a flow guide head, and the flow guide head protrudes out of the nozzle and is of a mushroom-shaped structure; an annular flow passage is arranged between the flow guide head and the nozzle; the number of the hot air inlets is 2, and the hot air inlets are close to one end of the tail part of the gun body and are oppositely arranged at two sides of the gun body; a hot air inlet pipe is arranged at the hot air inlet, the hot air inlet pipe is vertically intersected with the spray gun body, and a connecting flange is arranged at the outer end of the hot air inlet pipe;
the blowing process for steelmaking comprises the following steps: oxygen-enriched hot air entering the hot air spray gun through the hot air inlet is buffered by the opposite hot air inlet pipe and then flows to the nozzle; the temperature of the oxygen-enriched hot air is controlled to be 500-1200 ℃, the inlet flow rate of the oxygen-enriched hot air is 90-110 m/s, and the outlet flow rate of the oxygen-enriched hot air at the nozzle is 350-400 m/s; the temperature difference between the water inlet and the water return in the water cooling jacket is not more than 15 ℃, and the average flow speed of the cooling water is not less than 10m/s; the oxygen-enriched hot air flows out from the spray opening in an umbrella shape under the action of the flow guide head; after oxygen-enriched hot air enters the furnace, the oxygen-enriched hot air is mixed with CO gas rising in the furnace to carry out secondary combustion heat release, an oxidation heat release area is formed in the upper area of the furnace, heat is transferred to a lower molten pool through heat transfer between gases, and the temperature of the molten pool is increased; the 2 hot air inlets are used as a buffer chamber for oxygen-enriched hot air entering from the hot air inlet in a working state.
2. The converting process for steelmaking as defined in claim 1, wherein a water-stop plate is longitudinally provided at the middle part of the water-cooling jacket to divide the inner space of the water-cooling jacket into a water inlet channel and a water return channel; one end of the water inlet channel is connected with the cooling water inlet, the other end of the water inlet channel is communicated with the corresponding end of the water return channel, and the other end of the water return channel is connected with the cooling water outlet.
3. The converting process for steelmaking as defined in claim 1, wherein the tail of the lance body is closed by an end closure plate, the end closure plate being connected to the lance body by a flange; one end of the flow guide rod, which is far away from the flow guide head, is fixedly connected with the end sealing plate.
4. The converting process for steelmaking according to claim 1, wherein the guide bar comprises a guide bar body, a refractory material protection layer and an anchoring structure; the outside of guide bar body establishes the refractory material inoxidizing coating, and the refractory material inoxidizing coating passes through anchor structure and guide bar body fixed connection.
5. The converting process for steelmaking according to claim 4, wherein said deflector rod body is made of stainless steel; the guide head is made of refractory materials, and the guide head and the refractory material protective layer are of an integrated structure; the refractory material adopted by the diversion head and the refractory material protective layer is silicon carbide.
6. The converting process for steelmaking according to claim 4, wherein the anchoring structure comprises a plurality of rows of rivets and corresponding circular ring supports, wherein the rows of rivets and the corresponding circular ring supports are uniformly arranged along the axial direction and the circumferential direction of the guide rod, and the circular ring supports are fixedly connected with the guide rod body through the corresponding rivets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210688469.3A CN115232911B (en) | 2022-06-17 | 2022-06-17 | Hot air spray gun for steelmaking and converting process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210688469.3A CN115232911B (en) | 2022-06-17 | 2022-06-17 | Hot air spray gun for steelmaking and converting process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115232911A CN115232911A (en) | 2022-10-25 |
| CN115232911B true CN115232911B (en) | 2023-11-07 |
Family
ID=83669672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210688469.3A Active CN115232911B (en) | 2022-06-17 | 2022-06-17 | Hot air spray gun for steelmaking and converting process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115232911B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1003515A (en) * | 1961-05-10 | 1965-09-02 | Steel Co Of Wales Ltd | Improvements in the production of steel in open hearth furnaces or top blown converters |
| JPH06240329A (en) * | 1993-02-17 | 1994-08-30 | Nippon Steel Corp | Top blowing oxygen lance for refining molten metal and method for refining molten metal |
| JP2001032011A (en) * | 1999-07-21 | 2001-02-06 | Kawasaki Steel Corp | Top-blown lance for blowing into molten metal |
| JP2006328432A (en) * | 2005-05-23 | 2006-12-07 | Jfe Steel Kk | Blowing method for converter and top-blowing lance for converter blowing |
| JP2013209678A (en) * | 2012-03-30 | 2013-10-10 | Jfe Steel Corp | Method of manufacturing molten steel |
| CN108165700A (en) * | 2018-03-02 | 2018-06-15 | 北京科技大学 | A kind of thermometric spray gun for being installed on converter bottom and application method |
| CN109609717A (en) * | 2018-11-26 | 2019-04-12 | 江苏必瑞驰科技有限公司 | A kind of converter steel-smelting technique using porous oxygen lance |
| CN111455127A (en) * | 2020-05-23 | 2020-07-28 | 苏州大学 | Blowing control method for maintaining bottom powder spraying converter mushroom head |
| CN112094980A (en) * | 2020-08-18 | 2020-12-18 | 北京科技大学 | System and method for efficient smelting of converter through top-bottom composite powder injection |
-
2022
- 2022-06-17 CN CN202210688469.3A patent/CN115232911B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1003515A (en) * | 1961-05-10 | 1965-09-02 | Steel Co Of Wales Ltd | Improvements in the production of steel in open hearth furnaces or top blown converters |
| JPH06240329A (en) * | 1993-02-17 | 1994-08-30 | Nippon Steel Corp | Top blowing oxygen lance for refining molten metal and method for refining molten metal |
| JP2001032011A (en) * | 1999-07-21 | 2001-02-06 | Kawasaki Steel Corp | Top-blown lance for blowing into molten metal |
| JP2006328432A (en) * | 2005-05-23 | 2006-12-07 | Jfe Steel Kk | Blowing method for converter and top-blowing lance for converter blowing |
| JP2013209678A (en) * | 2012-03-30 | 2013-10-10 | Jfe Steel Corp | Method of manufacturing molten steel |
| CN108165700A (en) * | 2018-03-02 | 2018-06-15 | 北京科技大学 | A kind of thermometric spray gun for being installed on converter bottom and application method |
| CN109609717A (en) * | 2018-11-26 | 2019-04-12 | 江苏必瑞驰科技有限公司 | A kind of converter steel-smelting technique using porous oxygen lance |
| CN111455127A (en) * | 2020-05-23 | 2020-07-28 | 苏州大学 | Blowing control method for maintaining bottom powder spraying converter mushroom head |
| CN112094980A (en) * | 2020-08-18 | 2020-12-18 | 北京科技大学 | System and method for efficient smelting of converter through top-bottom composite powder injection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115232911A (en) | 2022-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103060510A (en) | High scrap ratio smelting method by adopting gas to heat | |
| CN109628689A (en) | High hot metal ratio electric furnace method for supplying oxygen | |
| CN110578032B (en) | Large converter blowing process method | |
| CN102732668B (en) | Oxygen furnace steel method capable of improving jet velocity through preheated oxygen | |
| CN115232911B (en) | Hot air spray gun for steelmaking and converting process thereof | |
| CN212357291U (en) | Oxygen lance nozzle with efficient dephosphorization | |
| CN201660655U (en) | High-efficiency oxygen lance nozzle of converter | |
| CN206337288U (en) | The three layers of polymer fluidic oxygen guns for converter high effective oxygen blowing | |
| CN109609717A (en) | A kind of converter steel-smelting technique using porous oxygen lance | |
| CN105441624B (en) | Gun head structure and method for regulating converter top blown oxygen flow by double-path oxygen flow | |
| CN108977620B (en) | Single-channel secondary combustion oxygen lance for improving steel scrap ratio of converter and use method thereof | |
| CN208829713U (en) | A kind of single channel Oxygen Lance With Secondary Combustion improving converter scrap ratio | |
| CN202881308U (en) | Cyclone oxygen lance for extracting vanadium in converter | |
| CN2245064Y (en) | Oxygen-gas spray gun for producing iron and steel | |
| CN205205168U (en) | A low temperature hangs down ferrosilicon water oxygen rifle shower nozzle for 90 tons of converters are smelted | |
| CN2366420Y (en) | Nozzle of oxygen lance for large scale converter | |
| CN103993127B (en) | A kind of oxygen lance blow head with concentrated a fluid stream | |
| CN210163472U (en) | Molten iron dephosphorization device | |
| CN111850232A (en) | Oxygen lance nozzle for efficient dephosphorization and blowing process | |
| CN208517453U (en) | A kind of single channel double structure oxygen lance nozzle | |
| CN203923246U (en) | A kind of oxygen lance blow head with concentrated a fluid stream | |
| CN1048563A (en) | The compound blow-double flow duct oxygen lance semisteel making technology and oxygen lance | |
| CN216337769U (en) | Double-angle multi-flow multi-hole oxygen lance nozzle | |
| CN210528964U (en) | Special oxygen burning gun for horizontal charging electric furnace | |
| CN215250980U (en) | Converter oxygen lance nozzle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |