CN214458149U - High-efficiency pollution-free powder spraying device for RH vacuum chamber - Google Patents
High-efficiency pollution-free powder spraying device for RH vacuum chamber Download PDFInfo
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- 238000005507 spraying Methods 0.000 title claims description 30
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- 239000010959 steel Substances 0.000 claims abstract description 93
- 238000007664 blowing Methods 0.000 claims abstract description 35
- 238000003756 stirring Methods 0.000 claims abstract description 26
- 229940098458 powder spray Drugs 0.000 claims abstract description 18
- 238000005253 cladding Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 9
- 238000007670 refining Methods 0.000 abstract description 19
- 238000006243 chemical reaction Methods 0.000 abstract description 4
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- 239000001301 oxygen Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 13
- 239000012159 carrier gas Substances 0.000 description 11
- 238000006477 desulfuration reaction Methods 0.000 description 11
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- 239000011593 sulfur Substances 0.000 description 8
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- 150000002910 rare earth metals Chemical class 0.000 description 6
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- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 229910001634 calcium fluoride Inorganic materials 0.000 description 4
- 238000005261 decarburization Methods 0.000 description 4
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- 229910052684 Cerium Inorganic materials 0.000 description 3
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 238000006356 dehydrogenation reaction Methods 0.000 description 1
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- 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
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Abstract
The utility model relates to a real empty room high-efficient pollution-free powder spray device of RH, including real empty room, transport feed bin, rotating electrical machines, rotatory powder spray gun includes hollow tube and refractory material cladding body, and the bottom of hollow tube is equipped with the blowing hole, and the bottom of refractory material cladding body is equipped with cross stirring head. The dynamic condition of reaction in the molten steel is improved, the collision, aggregation and growth of the inclusion and fine particles in the molten steel are promoted, the dispersed bubbles fully float upwards along with the inclusion, and the purity of the molten steel and the utilization rate of a refining solvent are improved, so that the molten steel is purified.
Description
Technical Field
The utility model relates to a ferrous metallurgy field, in particular to a real empty room high-efficient pollution-free powder spray device of RH.
Background
Cleaning is the main trend of modern steel material development, and clean steel production is the important direction of modern steel smelting technology development. O, P, S, H the deep processing problem of four major impurity elements is always the main contradiction and obstacle between steel purification and cost in the production process of various steels. Conventional processing means rely mainly on vacuum (RH, VD) and electrodes (LF). However, the method has expensive equipment cost and high use and maintenance cost, the cost of one process is 30-60 yuan/t even if the process is light, and particularly the upgrading and efficiency improvement are more important on the premise that the market price competition is extremely strong.
Different reducing agents and reducing processes are adopted, and the method plays a key role in deoxidation, desulfurization, alloying and improvement of the purity of the molten steel. Especially, the research on the composite deoxidizer and the deoxidation process explores that the deoxidizer can not only fully deoxidize the oxidizing molten steel, but also effectively remove deoxidation inclusions.
The disadvantages of the addition of deoxidizer to the ladle are: the mass transfer speed of the slag steel interface is slow, the deoxidation time is long, and the productivity is reduced.
The RH vacuum refining treatment level and the matching technology have reached a certain perfection and maturity, the capacity is from dozens of tons to 340t, more than 130 sets of equipment are put into use, and foreign steel companies such as Kopu project, Japanese New iron, German Tu's Krupp and the like all adopt RH devices. Japan made an important contribution in the course of the increasing sophistication of RH technology. After the RH vacuum refining technology is introduced in Japan in 1963, the functions of decarburization, deoxidation, oxygen blowing and temperature rising, powder injection and desulfurization, dephosphorization, component control and the like are developed on the basis of dehydrogenation, so that the improved RH process can carry out various metallurgical operations, and the requirements of expanding the range of steel treatment and improving the quality of steel are better met. In 1965, a 70tRH device is introduced in China, the advantages of the circulating vacuum degassing treatment are gradually recognized, and a plurality of steel enterprises such as Wu-Tou steel, Bao steel, Pan steel and the like also adopt the technology successively.
The RH refining technology is developed in a multifunctional way, and besides the degassing function, the RH refining technology is added with various functions of vacuum decarburization, desulfurization, dephosphorization, component fine adjustment, molten steel thermal compensation and the like, and various vacuum oxygen blowing forced decarburization technologies are provided for accelerating decarburization. The RH vacuum oxygen blowing technology is developed in 4 main stages of RH-O, RH-OB, RH-KTB and RH-MFB, and then the powder spraying function is added on the basis of RH-OB and RH-KTB equipment, so that the powder spraying device not only has the common RH function, but also has the functions of desulfurizing, dephosphorizing and changing the form of nonmetallic inclusions.
The refining powder is rotationally sprayed into a molten pool of the vacuum chamber at high pressure by applying an RH vacuum chamber spraying technology, the refining powder reacts with chemical elements in the molten pool, and fine micro bubbles are generated to capture and float inclusions existing in the molten pool, so that the effects of purifying molten steel and removing harmful elements in steel can be achieved. The invention applies the vacuum chamber rotary blowing technology, overcomes the defect that the surface of the molten steel is contacted with air in the conventional blowing method, and the blowing gas can cause the liquid level to roll because the surface of the molten steel is contacted with the air in the conventional blowing technology, so that oxygen in the air can react with the molten steel to generate oxides, the oxygen content in the molten steel is increased, and new inclusion is formed to pollute the molten steel. The invention adopts the rotary blowing of the vacuum chamber, and the blowing is isolated from the outside air in the vacuum chamber, thereby not causing the secondary pollution of the molten steel and improving the effect of purifying the molten steel.
CN2018114808799 proposes a RH refining rotary powder injection desulfurization method, which is inserted below the liquid level of molten steel in a vacuum chamber and above a downcomer through a T-shaped rotating head; and blowing holes are formed in two sides of the T-shaped rotating head and used for blowing refining powder into molten steel in the RH vacuum chamber. The method sprays the desulfurization powder into the liquid surface, although the method of applying rotation is applied, the retention time of bubbles and the powder under the liquid surface is increased, the bubbles come out of a spraying hole, are heated in the molten steel and rapidly expand and grow, the grown bubbles are quickly separated from the molten steel and are taken away by a vacuum pump, the probability of chemical reaction between the powder and elements in the molten steel is reduced in the process, most of the powder is taken away by the vacuum pump, and therefore the utilization rate of the powder is low, and the ideal refining effect cannot be achieved.
Disclosure of Invention
The utility model aims to solve the technical problem that a real empty room high-efficient pollution-free powder spraying device of RH is provided, the dynamic condition that the reaction goes on in having improved the molten steel, the inclusion collides with tiny granule, gathering and growing up in the promotion molten steel, and dispersed bubble is followed the inclusion and is fully floated, has improved the purity of molten steel and the utilization ratio of concise solvent to reach the purification molten steel.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides a real empty room high-efficient pollution-free powder spray device of RH, includes real empty room, carries feed bin, rotating electrical machines, rotatory powder spray gun, and rotatory powder spray gun includes hollow tube and resistant material cladding body, and the bottom of hollow tube is equipped with the blowing hole, and the bottom of resistant material cladding body is equipped with cross stirring head.
The diameter of the hollow pipe is 8-15 mm.
The number of the blowing holes is at least 1.
The hollow pipe is made of heat-resistant steel.
The length of the blade of the cross-shaped stirring head is 300-600mm, the width is 200-400mm, and the thickness is 40-60 mm.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses the stirring head will be blown gas and hit and beat, make the big bubble of spouting hit and beat for tiny dispersed bubble, and the tiny microbubble of dispersion has increased the dwell time of concise powder in the molten steel, has improved the dynamics condition that the reaction goes on in the molten steel, promotes inclusion in the molten steel and tiny granule collision, gathering and growing up, and dispersed bubble accompanies the inclusion and fully floats, has improved the purity of molten steel and the utilization ratio of concise solvent to reach the mesh of purifying the molten steel.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a view from a-a in fig. 1.
In the figure: the device comprises a vacuum chamber 1, a conveying bin 2, a rotating motor 3, a hollow pipe 4, a refractory coating body 5, a blowing hole 6 and a cross-shaped stirring head 7.
Detailed Description
The following further describes the embodiments of the present invention with reference to the attached drawings:
referring to fig. 1-2, an RH vacuum chamber high-efficiency pollution-free powder spraying device comprises a vacuum chamber 1, a conveying bin 2, a rotating motor 3 and a rotating powder spraying gun, wherein the rotating powder spraying gun comprises a hollow tube 4 and a refractory coating body 5, the bottom of the hollow tube 4 is provided with at least 1 blowing hole 6, and the bottom of the refractory coating body 5 is provided with a cross-shaped stirring head 7.
The length of the rotary powder spraying gun is 2600-4550 mm.
The diameter of the hollow tube 4 is 8-15 mm.
The hollow pipe 4 is made of heat-resistant steel.
The length of the blade of the cross-shaped stirring head 7 is 300-600mm, the width is 200-400mm, and the thickness is 40-60 mm.
The stirring head in the RH vacuum chamber is used for beating the injected gas, so that the injected large bubbles are beaten into fine dispersed bubbles, the fine bubbles carry the powder to be fully diffused in the molten steel, particularly the fine dispersed bubbles with slow rising speed, the size of part of the bubbles is smaller than 1mm, the part of the bubbles can stay in the molten steel within a period of time, the fine dispersed bubbles can be sucked into a molten steel ladle arranged at the lower part of the vacuum chamber through a descending pipe of the RH vacuum chamber, and the powder carried by the fine bubbles enters the molten steel ladle to be fully contacted with the molten steel. Therefore, the sprayed powder can not only react with the molten steel in the RH vacuum chamber, but also fully react with the molten steel in the molten steel tank, so that the molten steel which can not enter a 'dead zone' of the vacuum chamber from the ascending pipe in the molten steel tank has the opportunity to react with the sprayed powder, and the utilization efficiency of the powder and the RH refining effect are fully improved.
Example 1
The utility model provides a real empty room high-efficient pollution-free powder spray device of RH, includes real empty room 1, carries feed bin 2, rotating electrical machines 3, rotatory powder spray gun, and rotatory powder spray gun includes hollow tube 4 and resistant material cladding body 5, and the bottom of hollow tube 4 is equipped with 1 hole 6 that blows, and the bottom of resistant material cladding body 5 is equipped with cross stirring head 7.
The length of the rotary powder gun is 2680 mm. The hollow tube 4 is made of white steel. The hollow tube 4 has a diameter of 12 mm. The length of the blade of the cross-shaped stirring head 7 is 450mm, the width is 280mm, and the thickness is 50 mm.
The powder spraying steps of the RH high-efficiency pollution-free powder spraying device are as follows: 1) after the RH refining device works, the liquid level of the molten steel in the vacuum chamber reaches 1110mm, the cross-shaped stirring head starts to descend from a standby position after receiving a working instruction, is inserted 520mm below the liquid level of the molten steel, and starts to rotate to spray powder. The main components of the deoxidized powder used comprise CaO 70% and CaF212％、CaCO310 percent and 8 percent of rare earth (mixed rare earth mainly comprising La and Ce). The particle size of the blowing powder was 0.06 mm. 2) The rotating speed of the cross-shaped stirring head is set to 750 r/min. 3) Carrier gas flow of 66Nm for conveying bin3The carrier gas pressure is 1.5MPa, the powder spraying rate is 3.4kg/s, and the carrier gas is Ar gas. 4) The blowing time is 12min, the cross-shaped stirring head lifts the liquid level of the molten steel after blowing is finished, the rotating speed is reduced to be below 8r/min, 360mm above the liquid level of the molten steel is lifted, the rotation is accelerated for 20s again, and the rotating speed is 58 r/min.
The sulfur content is 48ppm and the total oxygen content is 50ppm before steel grade refining, the sulfur content of a finished product is 8ppm after the treatment of an efficient pollution-free powder spraying process, the desulfurization rate is 83.3 percent, the total oxygen content is reduced to 8ppm, and the temperature is reduced to 22 ℃. The total oxygen content after treatment can be used for evaluating the inclusion content in molten steel, and the embodiment obviously shows that the total oxygen content in the molten steel is reduced by 84 percent, and the molten steel purification effect is obvious.
Example 2
The utility model provides a real empty room high-efficient pollution-free powder spray device of RH, includes real empty room 1, carries feed bin 2, rotating electrical machines 3, rotatory powder spray gun, and rotatory powder spray gun includes hollow tube 4 and resistant material cladding body 5, and the bottom of hollow tube 4 is equipped with 2 blowing holes 6, and the bottom of resistant material cladding body 5 is equipped with cross stirring head 7.
The length of the rotary powder gun is 2700 mm. The hollow tube 4 is made of white steel. The hollow tube 4 has a diameter of 12 mm. The length of the paddle of the cross-shaped stirring head 7 is 460mm, the width is 280mm, and the thickness is 55 mm.
The powder spraying steps of the RH high-efficiency pollution-free powder spraying device are as follows: 1) after the RH refining device works, the liquid level of the molten steel in the vacuum chamber reaches 1130mm, the cross-shaped stirring head starts to descend from a standby position after receiving a working instruction, is inserted 550mm below the liquid level of the molten steel, and starts to rotate to spray powder. The main components of the deoxidized powder used comprise CaO 72% and CaF210％、CaCO39 percent of rare earth (mixed rare earth mainly comprising La and Ce) 9 percent. The particle size of the blowing powder was 0.07 mm. 2) The rotating speed of the cross-shaped stirring head is set to be 800 r/min. 3) The carrier gas flow of the conveying bin is 65Nm3/h, the carrier gas pressure is 1.5MPa, the powder spraying rate is 3.3kg/s, and the carrier gas is Ar gas. 4) The blowing time is 11min, the cross-shaped stirring head lifts the liquid level of the molten steel after the blowing is finished, the rotating speed is reduced to be less than 8r/min, the liquid level of the molten steel is lifted to be 350mm above the liquid level of the molten steel, the rotation is accelerated for 25s again, and the rotating speed is 65 r/min.
The sulfur content is 51ppm and the total oxygen content is 53ppm before the steel grade is refined, the sulfur content of the finished product is 8ppm after the treatment of the high-efficiency pollution-free powder spraying process, the desulfurization rate is 84.3 percent, the total oxygen content is reduced to 9ppm, and the temperature is reduced to 21 ℃. The total oxygen content after treatment can be used for evaluating the inclusion content in the molten steel, and the embodiment obviously shows that the total oxygen content in the molten steel is reduced by 83 percent, and the molten steel purification effect is obvious.
Example 3
The utility model provides a real empty room high-efficient pollution-free powder spray device of RH, includes real empty room 1, carries feed bin 2, rotating electrical machines 3, rotatory powder spray gun, and rotatory powder spray gun includes hollow tube 4 and refractory material cladding body 5, and the bottom of hollow tube 4 is equipped with blowing hole 6, and the bottom of refractory material cladding body 5 is equipped with cross stirring head 7.
The length of the rotary powder gun is 2750 mm. The hollow tube 4 is made of white steel. The hollow tube 4 has a diameter of 12 mm. The length of the blade of the cross-shaped stirring head 7 is 500mm, the width is 300mm, and the thickness is 60 mm.
The powder spraying steps of the RH high-efficiency pollution-free powder spraying device are as follows: 1) after the RH refining device works, the liquid level of the molten steel in the vacuum chamber reaches 1140mm, the cross-shaped stirring head starts to descend from a standby position after receiving a working instruction, is inserted 530mm below the liquid level of the molten steel, and starts to rotate to spray powder. The main components of the deoxidized powder used comprise CaO 69% and CaF211％、CaCO39 percent and rare earth (mixed rare earth mainly comprising La and Ce) 11 percent. The particle size of the blowing powder was 0.05 mm. 2) The rotating speed of the cross-shaped stirring head is set to 900 r/min. 3) The carrier gas flow of the conveying bin is 66Nm3/h, the carrier gas pressure is 1.5MPa, the powder spraying rate is 3.4kg/s, and the carrier gas is Ar gas. 4) The blowing time is 11min, the cross-shaped stirring head lifts the liquid level of the molten steel after blowing is finished, the rotating speed is reduced to be less than 8r/min, the liquid level of the molten steel is lifted to be 350mm above the liquid level of the molten steel, the rotation is accelerated for 20s again, and the rotating speed is 60 r/min.
The sulfur content is 49ppm and the total oxygen content is 52ppm before the steel grade is refined, the sulfur content of the finished product is 8ppm after the treatment of the high-efficiency pollution-free powder spraying process, the desulfurization rate is 83.7 percent, the total oxygen content is reduced to 9ppm, and the temperature is reduced to 21 ℃. The total oxygen content after treatment can be used for evaluating the inclusion content in the molten steel, and the embodiment obviously shows that the total oxygen content in the molten steel is reduced by 82.7 percent, and the molten steel purification effect is obvious.
Comparative example
The T-shaped rotating head for spraying powder in a rotating manner by adopting an RH refining vacuum chamber is implemented on a 180T molten steel ladle for producing low-carbon aluminum killed steel, the converter tapping temperature for implementing steel grades is 1639 ℃, and the carbon content is 0.07%. The total length of the gun of the rotary powder gun is 7120mm, the length of the T-shaped rotating head is 600mm, the diameter of the stirring head is 280mm, the diameter of the blowing hole is 10mm, and the diameter of the hollow pipe is 100 mm. The main components of the used blowing powder comprise CaO 68% and CaF213％、CaCO310 percent. The particle size was 0.06 mm.
The molten steel refining rotary blowing desulfurization step using the device is as follows: 1) after the RH refining device works, the liquid level of the molten steel in the vacuum chamber reaches 1100mm, the rotary powder spraying gun starts to descend from a standby position after receiving a working instruction, is inserted 500mm below the liquid level of the molten steel, and starts to spray powder in a rotary mode. 2) The rotationThe rotation speed of the powder gun is set to be 160 r/min. 3) Carrier gas flow of 70Nm for conveying bin3The carrier gas pressure is 1.4MPa, and the powder spraying rate is 3.4 kg/s. 4) The blowing time is 13min, after blowing, the powder gun is rotated to lift the liquid level of the molten steel, the rotating speed is reduced to be below 10r/min, the liquid level of the molten steel is lifted by 300mm, the rotation is accelerated for 25s again, and the rotating speed is 50 r/min. The initial sulfur content before steel grade refining is 48ppm, the sulfur content of the finished product after rotary blowing desulfurization process is 11ppm, the desulfurization rate is 77.1 percent, and the temperature drop is 24 ℃. The initial total oxygen content was 51ppm, the total oxygen content after treatment was 26ppm, and the total oxygen content was reduced by 49%.
The above is only the basic principle of the present invention, not to the present invention makes any limitation, all the bases of the present invention are the same changes and modifications to the above, all within the scope of the protection scheme of the present patent technology.
Claims (5)
1. The utility model provides a real empty room high-efficient pollution-free powder spray device of RH, includes real empty room, carries feed bin, rotating electrical machines, rotatory powder spray gun, and rotatory powder spray gun includes hollow tube and resistant material cladding body, its characterized in that, the bottom of hollow tube is equipped with the blowing hole, and the bottom of resistant material cladding body is equipped with the cross stirring head.
2. The high-efficiency pollution-free powder spraying device for the RH vacuum chamber as claimed in claim 1, wherein the diameter of the hollow tube is 8-15 mm.
3. The high-efficiency pollution-free powder spraying device for the RH vacuum chamber as claimed in claim 1, wherein the hollow tube is made of heat-resistant steel.
4. The high-efficiency pollution-free powder spraying device for the RH vacuum chamber as claimed in claim 1, wherein the length of the blade of the cross-shaped stirring head is 300-600mm, the width is 200-400mm, and the thickness is 40-60 mm.
5. A high efficiency powder spraying device without pollution of RH vacuum chamber as claimed in claim 1, wherein the number of the blowing holes is at least 1.
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| CN117960031A (en) * | 2024-03-30 | 2024-05-03 | 潍坊国特矿山设备有限公司 | Ore pulp concentration adjusting device |
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| CN117960031A (en) * | 2024-03-30 | 2024-05-03 | 潍坊国特矿山设备有限公司 | Ore pulp concentration adjusting device |
| CN117960031B (en) * | 2024-03-30 | 2024-07-26 | 潍坊国特矿山设备有限公司 | Ore pulp concentration adjusting device |
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