CN115491467A - Top lance head and molten steel heating method - Google Patents
Top lance head and molten steel heating method Download PDFInfo
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- CN115491467A CN115491467A CN202211230883.6A CN202211230883A CN115491467A CN 115491467 A CN115491467 A CN 115491467A CN 202211230883 A CN202211230883 A CN 202211230883A CN 115491467 A CN115491467 A CN 115491467A
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- molten steel
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000010438 heat treatment Methods 0.000 title claims abstract description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 101
- 239000001301 oxygen Substances 0.000 claims abstract description 101
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 101
- 239000007789 gas Substances 0.000 claims description 50
- 239000002737 fuel gas Substances 0.000 claims description 37
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 32
- 239000003345 natural gas Substances 0.000 claims description 16
- 239000000571 coke Substances 0.000 claims description 15
- 238000002485 combustion reaction Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000005261 decarburization Methods 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 239000002436 steel type Substances 0.000 claims description 4
- 238000009826 distribution Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 3
- 238000007872 degassing Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 241001664469 Tibicina haematodes Species 0.000 description 2
- 239000000110 cooling liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000009849 vacuum degassing Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000007921 spray 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
- F27D2003/163—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel the fluid being an oxidant
- F27D2003/164—Oxygen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
- F27D2003/165—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel the fluid being a fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/168—Introducing a fluid jet or current into the charge through a lance
- F27D2003/169—Construction of the lance, e.g. lances for injecting particles
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Gas Burners (AREA)
Abstract
The invention discloses a top lance head and a heating method of molten steel, wherein a main body of the top lance head is internally provided with a first channel, a second channel and a third channel, the second channel is communicated with a first branch channel and a second branch channel, the first branch channel extends into a nozzle, the second branch channel extends out of an ejection end, one end of the third channel is communicated with a second oxygen supply end, and the other end of the third channel extends out of the ejection end.
Description
Technical Field
The application relates to the technical field of molten steel treatment, in particular to a top lance head and a molten steel heating method.
Background
The RH process, namely the molten steel vacuum circulation degassing process, is characterized in that two circulating pipes communicated with the vacuum chamber are arranged at the lower part of the vacuum chamber, the circulating pipes are inserted into the molten steel during degassing treatment, the molten steel enters the vacuum degassing chamber from the circulating pipes by the pressure difference established after the vacuum chamber is vacuumized, meanwhile, driving gas is blown in from one of the two circulating pipes (an ascending pipe), the molten steel is pumped by utilizing the principle of a bubble pump to flow through the degassing chamber and the descending pipe to generate circulation motion, and the gas is removed in the vacuum chamber.
The RH method is a refining mode preferentially selected for efficiently producing high-end varieties, and the application of the RH refining process is normalized in recent years. The RH method has the functions of circular mixing, vacuum degassing and decarburization, but the problem of large temperature reduction amplitude in the treatment process is not solved well all the time.
At present, a newly developed RH-KTB process is used for reducing the temperature drop of molten steel by performing secondary combustion on CO generated in the decarburization process, but the process cannot be performed at other times because the CO is generated in a large amount only in the early stage of decarburization. An RH-MFB process is also developed, molten steel and refractory materials are heated by burning gas and oxygen, but in the actual production process, the traditional Lauer top gun nozzle is adopted, only small-flow oxygen combustion can be carried out, the generated heat is limited, the heating effect is not ideal, the oxygen is ejected from the Lauer nozzle after large flow is adopted, and the ejected kinetic energy is large, so that the oxygen and the gas reach the liquid level of the molten steel before burning, the oxygenation of the molten steel is caused, and the cleanliness of the molten steel is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the application provides a top lance head and a heating method of molten steel, so as to solve the problems that oxygen and fuel gas sprayed from the lance head in the prior art are not sufficiently mixed and the combustion effect is poor.
The above purpose of the invention is mainly realized by the following technical scheme:
the utility model provides a top rifle head, is including the main part that is used for connecting the top rifle, be equipped with first passageway, second passageway and third passageway in the main part, one side that the main part kept away from the top rifle is equipped with ejection end, wherein:
one end of the first channel is used for being communicated with a first oxygen supply end, and a nozzle communicated with the spraying end is arranged between the other end of the first channel and the spraying end;
one end of the second channel is communicated with a gas supply end, the other end of the second channel is provided with a first branch channel and a second branch channel, the first branch channel extends into the nozzle so that oxygen in the first channel is mixed with gas in the first branch channel in the nozzle, and the second branch channel extends out of the ejection end;
one end of the third channel is used for being communicated with the second oxygen supply end, and the other end of the third channel extends out of the ejection end, so that oxygen in the third channel and fuel gas in the second branch channel are mixed after being ejected out of the ejection end.
Further, a centerline of the first channel coincides with a centerline of the body.
Further, the second channel is an annular channel, the center line of the second channel coincides with the center line of the first channel, and the inner diameter of the second channel is larger than the outer diameter of the first channel.
Furthermore, the first branch channel and the second branch channel are respectively provided with a plurality of branch channels, the branch channels are circumferentially distributed around the center line of the first channel, and the inner diameter of the first branch channel is the same as that of the second branch channel.
The top lance head further comprises a fourth channel and a fifth channel, the center lines of the fourth channel and the fifth channel are superposed with the center line of the first channel and are all designed into annular channels, the fourth channel is used for communicating a water inlet end, the fifth channel is used for communicating a water outlet end, and a communicating hole is formed between the fourth channel and the fifth channel.
Furthermore, the nozzle is provided with a retraction section and an expansion section, the inner walls of the retraction section and the expansion section are respectively designed to be conical surfaces, and a connecting channel with the smallest inner diameter is arranged at the connecting position of the retraction section and the expansion section.
Based on the same inventive concept, the application also provides a molten steel heating method, and equipment for realizing the heating method comprises the top lance head, wherein the heating method comprises the following steps:
vacuumizing the vacuum chamber;
after the molten steel of the non-decarburized steel grade begins to circulate, or after the molten steel of the decarburized steel grade is decarburized for 4-5min, driving the top lance head to descend to a position 3-5m above the molten steel;
introducing oxygen into the first channel and the third channel, and simultaneously introducing fuel gas into the second channel;
high-speed oxygen passing through the nozzle in the first channel is mixed with fuel gas in the first branch channel and sprayed out for combustion and heating;
and the oxygen in the third channel and the fuel gas in the second branch channel are mixed and sprayed out to be combusted and heated.
Further, the fuel gas is coke oven gas or natural gas, and when the fuel gas is coke oven gas, the flow of the fuel gas is 600-800m 3 The flow rate of the oxygen is 450-600m 3 When the fuel gas is natural gas, the flow of the fuel gas is 400-600m 3 The flow rate of the introduced oxygen is 800-1200m 3 /h。
Further, when the fuel gas is coke oven gas and the vacuum pressure in the vacuum chamber is not less than 40mbar, the oxygen inlet flow in the first channel is 3 times of the oxygen inlet flow in the third channel; and when the vacuum pressure in the vacuum chamber is less than 40mbar, the oxygen inlet flow in the first channel is 2 times of the oxygen inlet flow in the third channel.
Further, when the gas is natural gas and the vacuum pressure in the vacuum chamber is not less than 40mbar, the oxygen introducing flow in the first channel is the same as the oxygen introducing flow in the third channel; and when the vacuum pressure in the vacuum chamber is less than 40mbar, the oxygen inlet flow in the third channel is 2 times of the oxygen inlet flow in the first channel.
Compared with the prior art, the invention has the advantages that:
the top lance head is arranged on a top lance, a first channel, a second channel and a third channel are arranged in a main body, an ejection end is arranged on one side of the main body, which is far away from the top lance, one end of the first channel is communicated with a first oxygen supply end, a nozzle is arranged at the other end of the first channel, one end of the second channel is communicated with a gas supply end, a first branch channel and a second branch channel are arranged at the other end of the second channel, the first branch channel extends into the nozzle, the second branch channel extends out of the ejection end, one end of the third channel is communicated with a second oxygen supply end, and the other end of the third channel extends out of the ejection end.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a cross-sectional view of a top lance head provided in an embodiment of the present application;
fig. 2 is a schematic structural view of one side of a spraying end of a top lance head provided in an embodiment of the application;
in the figure: 1. a main body; 2. a first channel; 21. a nozzle; 22. a retracting section; 23. an extension section; 24. a connecting channel; 3. a second channel; 31. a first branch channel; 32. a second branch channel; 4. a third channel; 5. a fourth channel; 6. a fifth channel; 61. and a communicating hole.
Detailed Description
The invention is further described with reference to the following figures and specific examples. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely representative for purposes of describing example embodiments of the present invention. The present invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
As shown in fig. 1-2, a top lance head comprises a main body 1 for connecting a top lance, wherein a first channel 2, a second channel 3 and a third channel 4 are arranged in the main body 1, a blowout end is arranged on one side of the main body 1, which is far away from the top lance, the main body 1 is detachably connected with the top lance, the first channel 2, the second channel 3 and the third channel 4 are respectively arranged in the main body 1, so that a space capable of flowing is formed between one end of the main body 1 and the other end of the main body, and the blowout end on the main body 1 is operated and faces the molten steel to operate in the using process of the top lance, wherein:
one end of the first channel 2 is used for being communicated with a first oxygen supply end, a nozzle 21 communicated with the spraying end is arranged between the other end of the first channel 2 and the spraying end, and the first oxygen supply end conveys oxygen into the first channel 2 and sprays the oxygen to the outside of the main body 1 through the nozzle 21.
One end of the second channel 3 is used for being communicated with a gas supply end, the other end of the second channel is communicated with a first branch channel 31 and a second branch channel 32, the first branch channel 31 extends into the nozzle 21, so that oxygen in the first channel 2 is mixed with gas in the first branch channel 31 in the nozzle 21, the second branch channel 32 extends out of the ejection end, and the gas supply end conveys the gas into the second channel 3 and respectively enters the first branch channel 31 and the second branch channel 32 under the guiding and conveying of the second channel 3.
One end of the third channel 4 is used for being communicated with the second oxygen supply end, the other end of the third channel extends out of the ejection end, so that oxygen in the third channel 4 is mixed with fuel gas in the second branch channel 32 after being ejected out of the ejection end, and the second oxygen supply end conveys the oxygen into the third channel 4 and directly mixes the oxygen with the fuel gas ejected from the second branch channel 32 outside the ejection end.
The working principle of the embodiment is as follows: the top lance head is arranged on the top lance, a first channel 2, a second channel 3 and a third channel 4 are arranged in a main body 1, an ejection end is arranged on one side of the main body 1 far away from the top lance, one end of the first channel 2 is communicated with a first oxygen supply end, a nozzle 21 is arranged at the other end of the first channel, one end of the second channel 3 is communicated with a gas supply end, a first branch channel 31 and a second branch channel 32 are arranged at the other end of the main body, the first branch channel 31 extends into the nozzle 21, the second branch channel 32 extends out of the ejection end, one end of the third channel 4 is communicated with a second oxygen supply end, the other end extends out of the ejection end, during actual operation, oxygen is respectively introduced into the first channel 2 and the third channel 4, gas introduced into the second channel 3 is simultaneously delivered out through the first branch channel 31 and the second branch channel 32, and the oxygen in the third channel 4 and gas in the second branch channel 32 are mixed and combusted after the ejection end, the oxygen in the first channel 2 and the gas in the first branch channel 31 are further mixed and combusted in the second branch channel 32, so that the oxygen and the oxygen are mixed with the gas in the second branch channel 32, and the oxygen and oxygen are mixed with the molten steel, and oxygen in the second branch channel, and oxygen are heated, and oxygen are further used for improving the molten steel mixed with the molten steel.
Further, on the basis of the above embodiment, the center line of the first channel 2 coincides with the center line of the main body 1, the first channel 2 is kept at the center of the main body 1, when oxygen is introduced into the first channel 2 and the third channel 4, and gas is introduced into the second channel 3, the relative distance between the gas and the oxygen after being sprayed out is uniform, and the situation that oxygen and gas are mixed fully on one side and oxygen and gas are mixed insufficiently on the other side is avoided.
Further, in the above embodiment, the second passage 3 is provided as an annular passage, a center line of the second passage 3 coincides with a center line of the first passage 2, and an inner diameter of the second passage 3 is larger than an outer diameter of the first passage 2.
It should be noted that, because the gas introduced into the second channel 3 is guided by the first branch channel 31 and the second branch channel 32 and is respectively ejected, wherein the first branch channel 31 guides a part of the gas into the nozzle 21 to be mixed with the oxygen in the first channel 2, the second branch channel 32 guides a part of the gas out of the ejection end to be mixed with the oxygen in the third channel 4, and the second channel 3 is provided as an annular channel, on the premise of maintaining the ejection uniformity of the first branch channel 31 and the second branch channel 32, the space utilization rate in the main body 1 is also improved, and the space in the second channel 3 is also improved.
Further, on the basis of the above embodiment, a plurality of the first branch passages 31 and a plurality of the second branch passages 32 are respectively provided, and are circumferentially distributed around the center line of the first passage 2, the inner diameter of the first branch passage 31 is the same as the inner diameter of the second branch passage 32, so as to maintain the conveying efficiency of the first branch passage 31 and the second branch passage 32, and meanwhile, the flow rate of the fuel gas in the first branch passage 31 and the flow rate of the fuel gas in the second branch passage 32 are the same, so that the flow rate distribution of the oxygen gas and the fuel gas is conveniently controlled, and the combustion efficiency is further conveniently adjusted.
Further, on the basis of the above embodiment, the top lance head further includes a fourth channel 5 and a fifth channel 6, the center lines of the fourth channel 5 and the fifth channel 6 are overlapped with the center line of the first channel 2 and are both set as annular channels, the fourth channel 5 is used for communicating a water inlet end, the fifth channel 6 is used for communicating a water outlet end, and a communication hole 61 is arranged between the fourth channel 5 and the fifth channel 6.
In the actual use process, the cooling liquid is introduced into the fourth channel 5 through the water inlet end, flows into the fifth channel 6 from the communication hole 61 after reaching the communication hole 61, then moves to the water outlet end after passing through the fifth channel 6, and contacts with the main body 1 to complete heat exchange in the moving process of the fourth channel 5 and the fifth channel 6 so as to maintain the main body 1 in a relatively low temperature range, and in addition, a circulating component can be arranged between the water inlet end and the water outlet end so as to realize the circulating delivery of the cooling liquid and maintain the continuous cooling effect.
Further, on the basis of the above embodiment, the nozzle 21 has the contracting section 22 and the expanding section 23, the inner walls of the contracting section 22 and the expanding section 23 are respectively set to be conical surfaces, and the connecting channel 24 with the smallest inner diameter is arranged at the connecting position of the contracting section 22 and the expanding section 23, the contracting section 22 is arranged near the first channel 2, the expanding section 23 is arranged near the ejection end, and after the oxygen is conveyed into the first channel 2, the oxygen firstly enters the contracting section 22, passes through the connecting channel 24 with the smallest inner diameter between the contracting section 22 and the expanding section, then enters the expanding section, and is ejected quickly.
Based on the same inventive concept, the application also provides a molten steel heating method, and equipment for realizing the heating method comprises the top lance head, wherein the heating method comprises the following steps:
vacuumizing the vacuum chamber;
after the molten steel of the non-decarburization steel type begins to circulate, or after the molten steel of the decarburization steel type is decarburized for 4-5min, driving the top lance head to descend to a position 3-5m above the molten steel;
oxygen is introduced into the first channel 2 and the third channel 4, and meanwhile, fuel gas is introduced into the second channel 3;
the high-speed oxygen passing through the nozzle 21 in the first channel 2 is mixed with the fuel gas in the first branch channel 31 and is sprayed out for combustion and heating;
the oxygen in the third channel 4 is mixed with the fuel gas in the second branch channel 32 and is sprayed out for combustion and heating.
It is worth to say that the top lance head is located 3-5m above molten steel, and the low lance position is favorable for heat transfer to the molten steel, but the precondition is that the jet flow is completely combusted before reaching the molten steel surface.
Further, the fuel gas adopts coke oven gas or natural gas, and when the fuel gas adopts coke oven gas, the flow of the introduced fuel gas is 600-800m 3 The flow rate of the oxygen is 450-600m 3 When the fuel gas is natural gas, the flow of the fuel gas is 400-600m 3 The flow rate of the introduced oxygen is 800-1200m 3 /h。
It should be noted that, since the heating method of molten steel is a heat transfer operation performed after jet combustion, it means that the larger the amount of fuel used, the more heat is generated during combustion, and thus a better heating effect of molten steel can be achieved.
When coke oven gas is used as fuel gas, the maximum allowable flow of the top lance is 800m 3 H, when a larger flow is set, the vacuum degree in the vacuum chamber is affected because the coke oven gas is burnt to generate gas, and the gas needs to be pumped away when the vacuum is maintained, at the moment, the pressure in the vacuum chamber is increased when the gas generation amount is larger than the pumping-away amount of the vacuum pump, which is unfavorable for treating molten steel, and the set flow is less than 600m 3 At the hour of heating, the heating efficiency is low, 600-800m 3 The flow rate/h is the optimum flow rate range in consideration of the above two points.
Because the oxygen demand of the combustion of the natural gas and the coke oven gas is different, when the natural gas and the coke oven gas are combustedWhen the gas is gas in the weather, the flow of the natural gas is set to be 400-600m 3 H, to maintain a stable heating effect.
The oxygen flow is controlled according to the fuel gas flow, the oxygen-fuel ratio when the coke oven gas is completely combusted is 0.75, namely the ratio of the oxygen flow to the fuel gas flow is 0.75, and the oxygen-fuel ratio when the natural gas is completely combusted is 2.0, namely the ratio of the oxygen flow to the fuel gas flow is 2.0.
Further, when the gas is coke oven gas and the vacuum pressure in the vacuum chamber is not less than 40mbar, the oxygen introducing flow in the first channel 2 is 3 times of the oxygen introducing flow in the third channel 4; when the vacuum pressure in the vacuum chamber is less than 40mbar, the oxygen inlet flow in the first channel 2 is 2 times of the oxygen inlet flow in the third channel 4.
The oxygen distribution ratio in the first channel 2 and the second channel 3 is 3. When the vacuum pressure in the vacuum chamber is less than 40mbar, the adverse effect of a large ambient pressure cannot be overcome at the outlet of the third channel 4, which reduces the distribution ratio of oxygen in the first channel 2 and the third channel 4 to 2.
Specifically, under the premise that the vacuum pressure in the vacuum chamber is different, the coke oven gas which burns out the same amount consumes 400m 3 In the case of oxygen, the distribution of oxygen in the first channel 2 is 300m at a vacuum pressure in the vacuum chamber of not less than 40mbar 3 The oxygen distribution in the third channel 4 is 100m 3 (ii) a At a vacuum pressure of less than 40mbar in the vacuum chamber, the oxygen distribution in the first channel 2 drops to 266m 3 The oxygen distribution in the third channel 4 was increased to 133m 3 。
Further, when the gas is natural gas and the vacuum pressure in the vacuum chamber is not less than 40mbar, the flow rate of oxygen introduced into the first channel 2 is the same as that of oxygen introduced into the third channel 4; when the vacuum pressure in the vacuum chamber is less than 40mbar, the oxygen inlet flow in the third channel 4 is 2 times of the oxygen inlet flow in the first channel 2.
Similarly, because the natural gas has different oxygen consumption during combustion, in order to maintain more stable combustion time and combustion effect, specifically, under the premise that the vacuum pressure in the vacuum chamber is different, the same amount of natural gas consumed by burning the natural gas is 400m 3 In the case of oxygen, the distribution of oxygen in the first channel 2 is 200m at a vacuum pressure in the vacuum chamber of not less than 40mbar 3 The oxygen distribution in the third channel 4 is 200m 3 (ii) a At a vacuum pressure of less than 40mbar in the vacuum chamber, the oxygen distribution in the first channel 2 drops to 133m 3 The oxygen distribution in the third passage 4 was increased to 266m 3 。
It should be understood that the terms first, second, etc. are used merely for distinguishing between descriptions and are not intended to indicate or imply relative importance. Although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present invention.
It should be understood that the term "and/or" herein is only one kind of association relationship describing the association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, B exists alone, and A and B exist at the same time, and the term "/and" is used herein to describe another association object relationship, which means that two relationships may exist, for example, A/and B, may mean: a alone, and both a and B alone, and further, the character "/" in this document generally means that the former and latter associated objects are in an "or" relationship.
It is to be understood that the terms "upper," "vertical," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship that is conventionally used for placing the disclosed articles of manufacture or that is conventionally understood by those skilled in the art, which is intended merely to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or groups thereof.
In the following description, specific details are provided to facilitate a thorough understanding of example embodiments. However, it will be understood by those of ordinary skill in the art that the example embodiments may be practiced without these specific details. In other instances, well-known processes, structures and techniques may be shown without unnecessary detail in order to avoid obscuring the example embodiments.
The foregoing are merely exemplary embodiments of the present application and are presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a top rifle head, its characterized in that, it is including the main part that is used for connecting the top rifle, be equipped with first passageway, second passageway and third passageway in the main part, the main part is kept away from one side of top rifle is equipped with ejection end, wherein:
one end of the first channel is used for being communicated with a first oxygen supply end, and a nozzle communicated with the spraying end is arranged between the other end of the first channel and the spraying end;
one end of the second channel is communicated with a gas supply end, the other end of the second channel is provided with a first branch channel and a second branch channel, the first branch channel extends into the nozzle so that oxygen in the first channel is mixed with gas in the first branch channel in the nozzle, and the second branch channel extends out of the ejection end;
one end of the third channel is used for being communicated with the second oxygen supply end, and the other end of the third channel extends out of the ejection end, so that oxygen in the third channel and fuel gas in the second branch channel are mixed after being ejected out of the ejection end.
2. A top lance head according to claim 1, wherein: a centerline of the first channel coincides with a centerline of the body.
3. A top lance tip according to claim 1, wherein: the second channel is an annular channel, the center line of the second channel is overlapped with the center line of the first channel, and the inner diameter of the second channel is larger than the outer diameter of the first channel.
4. A top lance tip according to claim 1, wherein: the first branch channel and the second branch channel are respectively provided with a plurality of branch channels and are distributed circumferentially around the center line of the first channel, and the inner diameter of the first branch channel is the same as that of the second branch channel.
5. A top lance head according to claim 1, wherein: the top lance head further comprises a fourth channel and a fifth channel, the center lines of the fourth channel and the fifth channel are superposed with the center line of the first channel and are all designed into annular channels, the fourth channel is used for communicating with a water inlet end, the fifth channel is used for communicating with a water outlet end, and a communicating hole is formed between the fourth channel and the fifth channel.
6. A top lance head according to claim 1, wherein: the nozzle is provided with a retraction section and an expansion section, the inner walls of the retraction section and the expansion section are respectively set to be conical surfaces, and a connecting channel with the smallest inner diameter is arranged at the connecting position of the retraction section and the expansion section.
7. A method of heating molten steel, the method being carried out using an apparatus comprising a top lance head as defined in any one of claims 1 to 6, the method comprising the steps of:
vacuumizing the vacuum chamber;
after the molten steel of the non-decarburization steel type begins to circulate, or after the molten steel of the decarburization steel type is decarburized for 4-5min, driving the top lance head to descend to a position 3-5m above the molten steel;
introducing oxygen into the first channel and the third channel, and simultaneously introducing fuel gas into the second channel;
high-speed oxygen passing through the nozzle in the first channel is mixed with fuel gas in the first branch channel and sprayed out for combustion and heating;
and the oxygen in the third channel and the fuel gas in the second branch channel are mixed and sprayed out to be combusted and heated.
8. The molten steel heating method according to claim 7The method is characterized in that: the fuel gas adopts coke oven gas or natural gas, and when the fuel gas adopts coke oven gas, the flow of the fuel gas is 600-800m 3 The flow rate of the oxygen is 450-600m 3 When the fuel gas is natural gas, the flow of the fuel gas is 400-600m 3 The flow rate of the introduced oxygen is 800-1200m 3 /h。
9. The method of heating molten steel of claim 8, wherein: when the gas is coke oven gas and the vacuum pressure in the vacuum chamber is not less than 40mbar, the oxygen inlet flow in the first channel is 3 times of the oxygen inlet flow in the third channel; when the vacuum pressure in the vacuum chamber is less than 40mbar, the oxygen inlet flow in the first channel is 2 times of the oxygen inlet flow in the third channel.
10. The method of heating molten steel of claim 8, wherein: when the gas is natural gas and the vacuum pressure in the vacuum chamber is not less than 40mbar, the oxygen introduction flow in the first channel is the same as the oxygen introduction flow in the third channel; when the vacuum pressure in the vacuum chamber is less than 40mbar, the oxygen inlet flow in the third channel is 2 times of the oxygen inlet flow in the first channel.
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| CN202211230883.6A CN115491467B (en) | 2022-10-08 | 2022-10-08 | Heating method for top gun head and molten steel |
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| CN202211230883.6A CN115491467B (en) | 2022-10-08 | 2022-10-08 | Heating method for top gun head and molten steel |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201250248Y (en) * | 2008-08-14 | 2009-06-03 | 管序荣 | Spray nozzle for refining furnace |
| JP2013159810A (en) * | 2012-02-03 | 2013-08-19 | Nippon Steel & Sumitomo Metal Corp | Method for producing low-sulfur steel |
| CN105316452A (en) * | 2015-11-26 | 2016-02-10 | 中冶赛迪工程技术股份有限公司 | High-lance-position vacuum refining method based on coherent jet top lance |
| CN207019063U (en) * | 2017-07-19 | 2018-02-16 | 上海华之邦科技股份有限公司 | A kind of low heat value/low-pressure gas burner |
-
2022
- 2022-10-08 CN CN202211230883.6A patent/CN115491467B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201250248Y (en) * | 2008-08-14 | 2009-06-03 | 管序荣 | Spray nozzle for refining furnace |
| JP2013159810A (en) * | 2012-02-03 | 2013-08-19 | Nippon Steel & Sumitomo Metal Corp | Method for producing low-sulfur steel |
| CN105316452A (en) * | 2015-11-26 | 2016-02-10 | 中冶赛迪工程技术股份有限公司 | High-lance-position vacuum refining method based on coherent jet top lance |
| CN207019063U (en) * | 2017-07-19 | 2018-02-16 | 上海华之邦科技股份有限公司 | A kind of low heat value/low-pressure gas burner |
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| CN115491467B (en) | 2024-07-09 |
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