CN215251001U - Anti-blocking device for blowing hole of dip pipe of RH furnace - Google Patents
Anti-blocking device for blowing hole of dip pipe of RH furnace Download PDFInfo
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- CN215251001U CN215251001U CN202120548554.0U CN202120548554U CN215251001U CN 215251001 U CN215251001 U CN 215251001U CN 202120548554 U CN202120548554 U CN 202120548554U CN 215251001 U CN215251001 U CN 215251001U
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Abstract
The utility model belongs to the ferrous metallurgy steelmaking field, concretely relates to RH stove dip pipe gas blow hole anti-clogging device, divide pipeline and flowmeter through setting up oxygen on the gas blow pipe way, appear diminishing or when blockking up the condition completely when dip pipe tedge gas blow hole, let in oxygen when the vacuum tank is non-handled, make full use of oxygen carries out oxidation reaction with the downthehole slag of dip pipe tedge gas blow, thereby melt the jam slag of dip pipe tedge gas blow hole department, and drop slag or molten steel blow to outside the gas blow hole under the oxygen promotion of certain velocity of flow. The cleaning process is safe and efficient, is more efficient than adding a reactant, has short treatment time and lower cost, and can effectively remove the steel slag deeply blocked in the blowing holes. The anti-blocking device effectively reduces the situation that the flow of the air blowing hole is reduced or the air blowing hole is completely blocked, so that the circulation effect in the service life of the dip pipe is ensured, and the dip pipe is prevented from being off-line due to blocking.
Description
Technical Field
The utility model belongs to the ferrous metallurgy steelmaking field, concretely relates to RH stove dip pipe gas hole anti-clogging device.
Background
The RH furnace circulation flow rate can most directly reflect the RH refining efficiency. The circulation flow is increased, the RH processing capacity can be improved, and the uniformity and the purity of the components of the molten steel are enhanced, so that the quality of the molten steel is improved and stabilized. The size and the flow of the air blowing hole of the dip pipe are the most direct dynamic influence key factors of the circulation flow, so the air blowing hole of the dip pipe becomes an important part concerned by technical personnel of the vacuum refining furnace; the blowing holes are blocked due to the fact that a large amount of molten steel and steel slag flow in an ascending pipe of the dip pipe in the circulation process of the vacuum furnace, or the situation that the steel slag in the baking process of the vacuum tank flows out after being melted to block the blowing holes of the dip pipe occurs sometimes, and great troubles are brought to the management and control of the production process.
The study of the 'RH process and the influence of the blowing hole blockage on the uniform mixing of molten steel' in 2011, No. 27 of Special Steel, No. 4 of Aixingang et al shows that when the number of the blowing holes of the dip pipe exceeds 3, the circulation efficiency of the RH furnace is obviously influenced. Chinese patent document CN105714024B provides a method for removing steel slag in a bottom groove of an RH vacuum chamber, which utilizes heat release during an aluminum oxidation reaction to melt and remove the steel slag. Preheating: controlling the lance position of the oxygen lance to be 5000-5600 mm, controlling the gas flow to be 400-500 m/h, baking for 10-20 min, and increasing the lifting gas flow to 120-150 m/h after steel slag begins to drip from the bottom groove. Adding aluminum: and adding 100-200 kg of aluminum wire sections to the groove part at the bottom of the vacuum chamber by using an aluminum alloy hopper. Slagging: controlling the position of an oxygen lance to be 5000-5600 mm and the gas flow to be 400-600 m/h, continuously baking for 5-20 min until an aluminum wire section added into a bottom groove burns, and melting steel slag; after the reaction of the aluminum wire section is finished, the flow of the lifting gas is adjusted to 80-120 m/h. The utility model discloses can realize getting rid of the bonding slag of real empty room bottom tank bottom of RH on line to effectively reduce RH circulation pipe and hang the sediment, enlarge the circulation pipe internal diameter, improve RH molten steel circulation speed, make product quality obtain reliable assurance.
According to the technical scheme, cold steel in the vacuum tank is removed, the cold steel is removed by utilizing the aluminum oxygen reaction heat release and the oxygen gun baking heating cold steel removal, so that an aluminum alloy is additionally added for heating reaction, coal gas is introduced, the cost is high, the reaction time is long, only hanging slag at the port of the circulating pipe can be melted and removed, and the effect of removing steel slag deeply blocked in the circulating pipe (namely a blowing hole) is not achieved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a RH stove dip pipe gas hole anti-clogging device. When the air blowing holes of the ascending pipes of the dipping pipe are reduced or completely blocked, oxygen is introduced when the vacuum tank is not processed, and the oxygen and steel slag in the air blowing holes of the ascending pipes of the dipping pipe are fully utilized to carry out oxidation reaction, so that the blocked steel slag at the air blowing holes of the ascending pipes of the dipping pipe is melted; and is blown out of the air blowing holes by oxygen with a certain flow rate. The cleaning process is safe and efficient, is more efficient than adding a reactant, has short treatment time and lower cost, and can effectively remove the steel slag deeply blocked in the blowing holes.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an anti-blocking device for a blowing hole of a dip pipe of an RH furnace comprises a dip pipe riser, wherein the lower end of the dip pipe riser is provided with the blowing hole, the blowing hole is connected with a blowing pipeline, the far end side of the blowing pipeline, away from the dip pipe riser, is connected with a nitrogen branch pipeline and an argon branch pipeline, and the near end side of the blowing pipeline, away from the dip pipe riser, is sequentially provided with an oxygen branch pipeline and a flowmeter from left to right;
and the nitrogen branch pipeline, the argon branch pipeline and the oxygen branch pipeline are respectively provided with a flow control valve.
Because the aperture of the air blowing pipeline is constant, air with the same initial pressure and initial flow is introduced, when the air blowing hole is blocked, the pressure in the air blowing pipeline is increased, the corresponding air flow rate is reduced, and the flow value measured by the flow meter is correspondingly reduced, so that the blocking degree of the air blowing hole is judged; simultaneously because the reaction is just finished, the dip pipe is in high temperature state, lets in oxygen this moment, can make oxygen and the slag reaction of blowing hole department jam to make the slag melt, thereby blown down from the blowing hole by certain velocity of flow oxygen, in the actual operation, also can judge the clearance effect with the help of whether there is the slag to fall down, when no slag falls down, the artifical actual clearance effect of observing the blowing hole department slag through the vision and to further confirm the erosion condition of dip pipe resistant material.
The technical proposal of the utility model is also that: the dip pipe riser is provided with 12 air blowing holes which are divided into 2 layers, 6 air blowing holes in each layer are uniformly distributed along the circumference of the dip pipe riser, and the upper layer and the lower layer are arranged in a staggered mode.
The technical proposal of the utility model is also that: still include nitrogen gas trunk line, argon gas trunk line, oxygen trunk line, pressure transmitter and air supply, nitrogen gas branch pipeline, argon gas branch pipeline, oxygen branch pipeline are connected with corresponding the air supply through nitrogen gas trunk line, argon gas trunk line, oxygen trunk line respectively, be provided with pressure transmitter on nitrogen gas trunk line, argon gas trunk line, the oxygen trunk line respectively. The gas source comprises an oxygen gas source, a nitrogen gas source and an argon gas source.
Based on RH stove dip pipe blow hole anti-clogging device gets rid of method of blow hole slag, utilize the exothermal among the carbon oxygen reaction process, make slag part or whole melting, reduce the adhesive force of slag and blow hole inner wall to utilize the oxygen of certain velocity of flow to blow off the interior molten steel of blow hole or slag, its concrete method and step are:
(1) and information acquisition: the pressure of a pressure transmitter is constant, the working temperature of the RH furnace is simulated, the influence of temperature change on a test result in actual operation is small, no consideration is given to the temperature change, when the gas blowing hole is not blocked, the flow regulating valve is regulated to enable the initial flow of gas to be 50-150 m3/h, and the flow value of the position of the flowmeter under the condition of different initial flow of gas is recorded; the pressure value ranges of the pressure transmitters on the argon main pipeline and the nitrogen main pipeline are controlled to be 0.9-1.5 mpa, and the pressure value ranges of the pressure transmitters on the oxygen main pipeline are controlled to be 1.0-1.2 mpa;
(2) and judging blockage: introducing gas with the same pressure and flow rate at the same temperature, and when the flow rate value measured by the flowmeter is reduced by 10% compared with the corresponding value of information acquisition when the gas blowing hole is not blocked, indicating that the gas blowing hole is blocked; the pressure is controlled by a pressure transmitter, and the flow is controlled by a flow control valve;
(3) blowing oxidation slag: and after smelting is finished, introducing oxygen into the blocked air blowing holes, adjusting the flow regulating valve to enable the initial flow of the oxygen corresponding to the oxygen branch pipeline to be 80-100 m3/h, and indicating that deslagging is finished until the actually measured flow value of the corresponding flowmeter is the same as the information acquisition corresponding value when the air blowing holes are not blocked.
The method for removing the steel slag with the blowing holes further comprises the following steps:
(4) and intelligently blowing oxygen: aiming at the blockage of the air blowing hole in different degrees, the initial flow of oxygen is intelligently controlled, when the flow value measured by the flowmeter is reduced by 10-50% compared with the corresponding value of information acquisition when the air blowing hole is not blocked, the flow regulating valve is regulated to enable the initial flow of oxygen corresponding to the oxygen branch pipeline to be 80-90m3/h, when the flow value measured by the flowmeter is reduced by more than 50% compared with the corresponding value of information acquisition when the air blowing hole is not blocked, the flow regulating valve is regulated to enable the initial flow of oxygen corresponding to the oxygen branch pipeline to be 90-100m3/h, and the deslagging is completed until the actually measured flow value of the corresponding flowmeter is the same as the corresponding value of information acquisition when the air blowing hole is not blocked.
Because all the oxygen branch pipelines are simultaneously connected with the oxygen main pipeline, the pressure transmitter controls the initial pressure of the oxygen main pipeline, one or more oxygen branch pipelines are closed, the initial pressure of other oxygen branch pipelines is correspondingly increased, and the initial flow of oxygen can be increased; and through controlling the opening degree of the flow control valve of the oxygen branch pipeline, the initial oxygen pressure and flow value of the oxygen branch pipeline can be controlled, oxygen with the same initial pressure and initial flow is introduced, the pressure difference corresponding to the flow meter on the air blowing pipeline and the air blowing hole is constant, when the air blowing hole is blocked, the pressure difference between the flow meter and the air blowing hole is reduced, the flow velocity of the oxygen is reduced, and the flow value measured at the flow meter is reduced, so that the blocking degree of the air blowing hole and the oxygen cleaning progress can be judged according to the change of the flow value measured by the flow meter. Meanwhile, the flow of the initial oxygen is adjusted according to the degree of blockage of the air blowing hole, the steel slag cleaning speed can be increased, and the waste of the oxygen is avoided.
The utility model has the advantages that:
(1) the utility model is applied to cleaning up the blow hole blockage of the ascending pipe of the dip pipe in the high temperature environment, avoids the occurrence of inserting the dip pipe due to blockage, improves the service life of the dip pipe, and ensures the stability of the circulation efficiency and the molten steel quality in the service life of the dip pipe;
(2) the utility model adopts the existing equipment to simply reform and improve, the operation implementation is stronger, the cleaning of the blockage of the air blowing hole realizes the remote operation, the personnel is not needed to confirm the cleaning effect closely, the direct contact between the personnel and the high-temperature steel slag is avoided, and the initial gas flow of the corresponding oxygen branch pipeline can be adjusted aiming at the blockage of the air blowing hole in different degrees, the deslagging efficiency and the effect are improved, and the oxygen consumption is adjusted according to the blockage degree of the air blowing hole to achieve the purpose of saving the cost;
(3) the method has the advantages that the blocked blowing holes are cleaned by directly performing oxidation chemical reaction on the oxygen and the steel slag, the efficiency is higher than that of additionally adding a reactant, the treatment time is short, the cost is lower, and particularly, the steel slag deeply blocked in the blowing holes can be effectively removed.
Drawings
FIG. 1 is a schematic structural view of a blowing hole anti-blocking device of a dip pipe of an RH furnace according to the present invention;
FIG. 2 is a schematic view of the arrangement of blowing holes of the anti-clogging device for the blowing holes of the dip pipe of the RH furnace;
in the figure: the device comprises a vacuum tank 1, a dip pipe riser 2, a dip pipe downcomer 3, a blowing hole 4, a nitrogen gas branched pipeline 5, an argon gas branched pipeline 6, a blowing pipeline 7, an oxygen gas branched pipeline 8 and a flow meter 9.
Detailed Description
The invention is further described below with reference to the drawings and the specific embodiments, but the invention is not limited to the embodiments described.
Example 1
As shown in fig. 1, an anti-clogging device for a blowing hole of a dip pipe of an RH furnace comprises a vacuum tank 1, a dip pipe rising pipe 2, a dip pipe descending pipe 3, a blowing hole 4, a nitrogen branch pipe 5, an argon branch pipe 6 and a blowing pipe 7, wherein the dip pipe rising pipe 2 and the dip pipe descending pipe 3 are arranged at the bottom of the vacuum tank 1, the blowing hole 4 is arranged at the lower end of the dip pipe rising pipe 2, the blowing hole 4 is connected with the blowing pipe 7, the far end side of the blowing pipe 7 away from the dip pipe rising pipe 2 is connected with the nitrogen branch pipe 5 and the argon branch pipe 6, the device further comprises an oxygen branch pipe 8 and a flow meter 9, and the near end side of the blowing pipe 7 away from the dip pipe rising pipe 2 is sequentially provided with the oxygen branch pipe 8 and the flow meter 9 from left to right.
And the nitrogen branch pipe 5, the argon branch pipe 6 and the oxygen branch pipe 8 are respectively provided with a flow control valve.
As shown in fig. 2, the dip pipe riser 2 is provided with 12 air blowing holes 4, which are divided into 2 layers, 6 air blowing holes 4 in each layer are uniformly distributed along the circumference of the dip pipe riser 2, and the upper layer and the lower layer are staggered.
RH stove dip pipe gas hole anti-clogging device still is provided with nitrogen gas trunk line, argon gas trunk line, oxygen trunk line and air supply, nitrogen gas branch pipeline 5, argon gas branch pipeline 6, oxygen branch pipeline 8 are connected with corresponding the air supply through nitrogen gas trunk line, argon gas trunk line, oxygen trunk line respectively, be provided with pressure transmitter on nitrogen gas trunk line, argon gas trunk line, the oxygen trunk line respectively.
Example 2:
the method for removing the steel slag in the blowing hole is implemented by using the anti-blocking device for the blowing hole of the dip pipe of the RH furnace in the embodiment 1, after smelting of the RH furnace is completed, the vacuum tank 1 is repressurized, an operator lowers a steel ladle, and the blowing hole 4 of the dip pipe riser 2 is interlocked and automatically converted from argon to nitrogen for protection.
1) The pressure of the main nitrogen pipeline corresponding to the pressure transmitter is 1mpa, the initial flow of the branch nitrogen pipeline 5 is 85m3/h, when 1 blockage occurs to the air blowing hole 4, the flow value measured by the flowmeter 9 is reduced by 20% compared with the information acquisition corresponding value when the air blowing hole 4 is not blocked, the pressure value of the pressure transmitter of the main oxygen pipeline is 1.0mpa, the corresponding flow control valve of the branch oxygen pipeline 8 is controlled to be opened, and the flow control valve of the branch nitrogen pipeline 5 is closed after 30 seconds.
2) The initial oxygen flow of the oxygen branch pipe 8 is 85m3/h, the cleaning time is 1.5min, when the flow value measured by the flowmeter 9 rises to the information acquisition corresponding value when the blowing hole 4 is not blocked, the flow control valve of the nitrogen branch pipe 5 is opened, and the flow control valve of the oxygen branch pipe 8 is closed after 30 seconds.
Example 3:
when clogging of a plurality of blow holes 4 occurs, unlike in example 2, it is necessary to take into account the variation in the initial flow rate of oxygen required, because the respective clogging degrees are different.
1) The pressure of the main nitrogen pipeline corresponding to the pressure transmitter is 1mpa, the initial flow of the branch nitrogen pipeline 5 is 85m3/h, when 2 air blowing holes 4 are blocked, the flow value measured by one flowmeter 9 is reduced by 25% compared with the non-blocked information acquisition corresponding value, the flow value measured by the other flowmeter 9 is reduced by 80% compared with the non-blocked information acquisition corresponding value of the air blowing holes 4, the pressure value of the pressure transmitter of the main oxygen pipeline is 1.0mpa, the flow control valves of the corresponding oxygen branch pipelines 8 are controlled to be opened, and the flow control valves of the branch nitrogen pipelines 5 are closed after 30 seconds.
2) The initial oxygen flow of the oxygen branch pipe 8 corresponding to the 25% blocked air blowing holes 4 is 85m3/h, the initial oxygen flow of the oxygen branch pipe 8 corresponding to the 80% blocked air blowing holes 4 is 95m3/h, the oxygen cleaning time is 2min, when the flow value measured by the flowmeter 9 rises to the information acquisition corresponding value when the air blowing holes 4 are not blocked, the flow control valve of the nitrogen branch pipe 5 is opened, and meanwhile, the flow control valve of the oxygen branch pipe 8 is closed after 30 seconds. Through the adjustment to the initial flow of oxygen, effectual blowing hole 4 to different jam degrees carries out corresponding clearance, has avoided the waste of oxygen simultaneously.
In conclusion, adopt the utility model discloses clearance dip pipe tedge 2 is blockked up blow hole 4, the getting rid of plugs such as slag in the realization blow hole 4 that can be high-efficient accurate, directly utilize oxygen and slag directly to produce oxidation reaction, the cleaning time is steerable within 3min, do not need other reactant, and can effectively clear away to the deeper slag of blowing hole 4 internal blocking, smelt and provide powerful guarantee to the molten steel, great effect has been made for the long-term stability of molten steel quality, the life and the molten steel production efficiency of dip pipe have been improved.
And field operation usability is strong, the security is higher, utilizes the measured value of flowmeter 9 to change and foresees gas hole 4 jam degree and clearance progress simultaneously, has avoided the waste of oxygen to the efficiency of slagging-off has been improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art will understand that modifications and equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of them shall fall within the scope of the claims of the present invention.
Claims (3)
1. The utility model provides a RH stove dip pipe blowing hole anti-clogging device, includes dip pipe tedge (2), dip pipe tedge (2) lower extreme is provided with blowing hole (4), blowing hole (4) are connected with one and blow pipeline (7), are connected with one nitrogen gas branch pipe way (5) and one argon gas branch pipe way (6) at the distal end side that blows pipeline (7) and leave dip pipe tedge (2), its characterized in that: an oxygen branch pipe (8) and a flowmeter (9) are sequentially arranged on the near end side of the air blowing pipe (7) from the left to the right from the ascending pipe (2) of the dip pipe;
and the nitrogen branch pipeline (5), the argon branch pipeline (6) and the oxygen branch pipeline (8) are respectively provided with a flow control valve.
2. The RH furnace dip pipe gas blow hole anti-clogging device of claim 1, wherein: the dip pipe ascending pipe (2) is provided with 12 air blowing holes (4) which are divided into 2 layers, 6 air blowing holes (4) in each layer are uniformly distributed along the circumference of the dip pipe ascending pipe (2), and the upper layer and the lower layer are arranged in a staggered mode.
3. The RH furnace dip pipe blow hole anti-clogging device according to claim 1 or 2, characterized in that: still include nitrogen gas trunk line, argon gas trunk line, oxygen trunk line, pressure transmitter and air supply, nitrogen gas branch pipeline (5), argon gas branch pipeline (6), oxygen branch pipeline (8) are connected with corresponding the air supply through nitrogen gas trunk line, argon gas trunk line, oxygen trunk line respectively, be provided with pressure transmitter on nitrogen gas trunk line, argon gas trunk line, the oxygen trunk line respectively.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112877507A (en) * | 2021-02-03 | 2021-06-01 | 山东钢铁股份有限公司 | Anti-blocking device for blowing hole of RH furnace dipping pipe and method for removing steel slag in blowing hole |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112877507A (en) * | 2021-02-03 | 2021-06-01 | 山东钢铁股份有限公司 | Anti-blocking device for blowing hole of RH furnace dipping pipe and method for removing steel slag in blowing hole |
| CN112877507B (en) * | 2021-02-03 | 2023-10-13 | 山东钢铁股份有限公司 | RH furnace dip pipe blowhole anti-blocking device and method for removing blowhole steel slag |
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