CN114317895A - RH furnace dip pipe erosion monitoring device and using method thereof - Google Patents
RH furnace dip pipe erosion monitoring device and using method thereof Download PDFInfo
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- CN114317895A CN114317895A CN202210009055.3A CN202210009055A CN114317895A CN 114317895 A CN114317895 A CN 114317895A CN 202210009055 A CN202210009055 A CN 202210009055A CN 114317895 A CN114317895 A CN 114317895A
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003628 erosive effect Effects 0.000 title abstract description 19
- 238000012544 monitoring process Methods 0.000 claims abstract description 95
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 82
- 239000010959 steel Substances 0.000 claims abstract description 82
- 238000003723 Smelting Methods 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims description 22
- 239000007789 gas Substances 0.000 claims description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 13
- 238000005530 etching Methods 0.000 claims description 12
- 239000011261 inert gas Substances 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 6
- 239000010425 asbestos Substances 0.000 claims description 5
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 5
- 239000011819 refractory material Substances 0.000 claims description 5
- 229910052895 riebeckite Inorganic materials 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000002893 slag Substances 0.000 description 7
- 230000000754 repressing effect Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the technical field of ferrous metallurgy, in particular to an RH furnace dip pipe erosion monitoring device and a using method thereof. According to the invention, the monitoring pipe is arranged below the bottom end of the steel liner, when the castable and the working layer refractory are eroded by molten steel from the lower end, the monitoring pipe is melted through by the molten steel and starts to ventilate, and the data monitored by the flowmeter is transmitted to the RH furnace control system, so that an operator can know the erosion state in time, and serious consequences caused by the fact that the dip pipe is shortened due to erosion in time in the smelting process are avoided.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to an RH furnace dip pipe erosion monitoring device and a using method thereof.
Background
The RH vacuum furnace is used as main smelting equipment of a refining process, and the process is mainly characterized in that molten steel is treated in a vacuum environment, wherein a dip pipe is in a severe environment in which high-temperature steel slag is continuously eroded, and the requirement on the safety coefficient of use is higher; because the dip pipe needs to be inserted into molten steel, abnormal changes of the state of the dip pipe cannot be observed in real time in the smelting process, particularly, the dip pipe has serious erosion of a castable of an outer layer after a plurality of smelting furnaces, the smelting efficiency is greatly influenced and the smelting cost is improved if the dip pipe is offline for maintenance in advance, but if molten steel contacts and melts a steel liner due to erosion of the castable in the smelting process, a working layer refractory falls off, the dip pipe is scrapped and production is interrupted, if the dip pipe is suddenly shortened (due to falling of the working layer refractory), the molten steel in a vacuum tank and the molten steel in a steel ladle lose balance under the action of a vacuum environment in the vacuum tank and external atmospheric pressure, the molten steel and the steel slag in the steel ladle are instantly extruded into vacuum systems such as the vacuum tank and a cooling pipeline, and meanwhile, a top lance in the vacuum tank is adhered by the steel slag, so that production is interrupted in a short time and production is difficult to recover in the vacuum system, delaying production and thereby increasing production costs.
The prior art and the prior art are all that the dip pipe structure and the materials are improved (an anchoring part is added to improve connection, materials with better heat resistance are used, and the like) so as to prolong the service life of the dip pipe, the state of the dip pipe is still required to be observed and judged every time when one furnace is smelted, the labor cost is greatly increased, the interval between two smelting furnaces is increased, the steel-making efficiency is reduced, the etching condition of the dip pipe cannot be monitored in real time, and the hidden danger that the dip pipe is scrapped in the smelting process so as to cause production interruption and even slag absorption accidents still exists.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an RH furnace dip pipe erosion monitoring device and a using method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a RH stove dip pipe erosion monitoring devices, includes dip pipe and monitoring subassembly, the dip pipe is by outer to interior castable, steel courage and the resistant material of working layer in proper order, the monitoring subassembly includes flowmeter and monitoring pipe, the monitoring pipe is connected and its end is sealed with outside air supply, the monitoring pipe is located the castable and is located the below of steel courage, the flowmeter is fixed in the junction of monitoring pipe and outside air supply, and the flowmeter is connected to RH stove control system.
The dip pipe is in the use, generally by the bottom etching that makes progress, simultaneously pouring material and working layer resistant material are simultaneously to inside etching, this device is through at the internal fixation monitoring pipe of pouring material, when the pouring material of dip pipe or working layer resistant material are etched by the time shortening from bottom to top, monitoring pipe exposes and is melted in the molten steel environment, the inside atmospheric pressure of monitoring pipe is released by melting this moment, the outside air supply of monitoring union coupling lasts the ventilation simultaneously, the flowmeter detects flow data and sends to RH stove control system, operating personnel can in time discover the etching phenomenon of dip pipe, in time handle the operation, prevent to cause further influence to steelmaking operation.
Preferably, the monitoring pipe is in a ring shape coaxial with the steel liner.
The monitoring pipe is arranged in a ring shape, the monitoring range of the etching state is further expanded, when any position below the steel liner is etched, the monitoring pipe is melted by molten steel, gas in the monitoring pipe is discharged, and the indicating number is generated at the flowmeter.
Preferably, the bottom surface of the monitoring pipe is located 2-3 cm below the bottom end of the steel container, so that gas circulation is generated in time when molten steel is etched to the monitoring pipe, flow readings measured by the flowmeter are sent to an RH furnace control system, operators are guaranteed to have enough time to stop production operation before further etching, and material loss is reduced.
Preferably, the air pressure in the monitoring pipe is 0.2-0.5 MPa.
Preferably, the inner diameter of the monitoring pipe is 3-5 mm, the thickness of the pipe wall is 1-1.5 mm, and air leakage caused by deformation is avoided when the air pressure is kept for a long time.
Preferably, asbestos wraps the part of the monitoring pipe exposed out of the dip pipe, so that the monitoring pipe is prevented from deforming and leaking due to baking of molten steel or steel slag, and the judgment of the monitoring assembly on the etching condition is prevented from being influenced.
Preferably, the external gas source connected with the monitoring pipe is a nitrogen gas source or an inert gas source, and after the monitoring pipe is melted through by molten steel, gas does not influence the quality of the molten steel when the gas is introduced into the molten steel.
Preferably, the flow meter is a flow transmitter.
The invention also provides a using method of the monitoring device for monitoring the etching condition, which comprises the following steps:
introducing nitrogen or inert gas into the monitoring device, keeping the air pressure at 0.2-0.5 MPa, connecting the flow meter to the RH furnace control system and interlocking with the RH furnace emergency re-pressure system, and when the flow count value is more than 6Nm in the molten steel smelting process3And when the pressure is over the preset value,/h, the RH furnace emergency repressurization system is started in a linkage manner, the molten steel in the vacuum tank is returned to the steel ladle by pressurizing the dip pipe, the erosion condition of the dip pipe is confirmed by an operator on site, and the dip pipe is offline.
The invention has the beneficial effects that:
according to the monitoring device provided by the invention, the monitoring tube is arranged below the bottom end of the steel liner, when the castable and the working layer refractory of the dip tube are eroded by molten steel from the lower end, the monitoring tube is melted through by the molten steel to start air leakage, the flowmeter monitors the data and transmits the data to the RH furnace control system, so that an operator can timely know the erosion state, the RH furnace emergency repressing system is interlocked with the flowmeter, the molten steel in the vacuum tank is timely started to return to the steel ladle when erosion occurs, the molten steel and the vacuum tank are protected, the problem that the erosion state cannot be monitored in real time in the smelting process by the prior art and the device is effectively solved, and the serious consequence caused by the fact that the dip tube is shortened due to erosion cannot be timely found in the smelting process is avoided.
Drawings
FIG. 1 is a sectional view of embodiment 2;
wherein, 1, casting material; 2. a steel liner; a working layer refractory material; 41. monitoring the pipe; 42. a flow meter.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Example 1:
an RH stove dip pipe erosion monitoring device comprises a dip pipe and a monitoring assembly, wherein the dip pipe is sequentially provided with a castable 1, a steel liner 2 and a working layer refractory 3 from outside to inside, the monitoring assembly comprises a flow meter 42 and a monitoring pipe 41, one end of the monitoring pipe 41 extends to the outside of the castable and is connected with an external air source, and the tail end (namely the other end connected with the external air source) of the monitoring pipe is closed, the monitoring pipe 41 is positioned in the castable 1 and is positioned 2-3 cm below the steel liner 2, the dip pipe is generally eroded from the bottom to the top in the actual smelting process, the monitoring pipe 41 is fixed below the steel liner 2 to ensure that erosion conditions can be found timely and processing time can be reserved for an operator, the flow meter 42 is fixed at the connection position of the monitoring pipe 41 and the external air source, and the flow meter 42 is connected to an RH stove control system. The flowmeter 42 is a flow transmitter, the flow transmitter has higher precision and is convenient for transmitting a flow monitoring numerical value to an RH furnace control system in real time.
The external gas source connected with the monitoring pipe 41 is a nitrogen gas source or an inert gas source, and after the monitoring pipe 41 is melted through by molten steel, gas does not influence the quality of the molten steel when being introduced into the molten steel. The air pressure in the monitoring pipe 41 is 0.2-0.5 MPa, the monitoring pipe 41 extends to the outside of the castable, and asbestos wraps the part exposed out of the dip pipe, so that the monitoring pipe 41 is prevented from deforming due to baking of molten steel or steel slag to cause a leak point, and the judgment of the monitoring component on the etching condition is prevented from being influenced; the inner diameter of the monitoring pipe 41 is 3-5 mm, the thickness of the pipe wall is 1-1.5 mm, and air leakage caused by deformation under the state of keeping the air pressure for a long time is avoided.
Example 2:
as shown in FIG. 1, the present example is different from example 1 in that the monitoring tube 41 is formed in an annular shape coaxial with the steel container 2.
The monitoring pipe 41 is arranged in an annular shape, so that the etching state monitoring range of the dip pipe is expanded, the monitoring pipe 41 surrounds a working layer refractory material inside, when the dip pipe is etched from bottom to top and reaches the lower part of the bottom end of the steel liner 2, the monitoring pipe 41 is melted through by molten steel to generate airflow, the flowmeter 42 generates readings and transmits the readings to the RH furnace control system, and an operator can know the etching state.
Experimental example 1:
the installation and use method of the monitoring device provided in embodiment 2 includes the following steps:
s1, after a steel liner 2 of a dip pipe is provided with a working layer refractory 3, tamping materials are filled between the steel liner 2 and the working layer refractory 3, and a monitoring pipe 41 is fixed in a casting material, wherein in the embodiment, the inner diameter of the monitoring pipe 41 is 4mm, the thickness of the pipe wall is 1mm, the upper end of the monitoring pipe 41 is connected with an external gas source (a nitrogen gas source or an inert gas source), the monitoring pipe 41 is wound around the bottom end of the steel liner 2 for a circle and is 2cm away from the bottom end of the steel liner 2, a flowmeter 42 is fixed on the monitoring pipe 41 and is close to the external gas source, a pressure test and sealing are carried out on a monitoring assembly after connection, the dip pipe is subjected to construction of the casting material 1 after the pipeline is airtight, the monitoring pipe 41 and part of the monitoring pipe 41 are arranged in the casting material 1, and the part of the monitoring pipe 41 exposed out of the casting material 1 is wrapped by asbestos;
s2, after the castable 1 of the dip pipe is dried, the dip pipe is integrally welded at the bottom of a vacuum tank (the serial number of an upper tank/a lower tank of the vacuum tank is 8/16), and gas (nitrogen or inert gas) provided by an external gas source is introduced into the monitoring pipe 41, wherein in the embodiment, the input pressure, namely the pressure in the monitoring pipe 41, is 0.4 MPa;
s3, after the vacuum tank is baked, smelting is carried out on line, the lower end erosion condition is severe when the dip pipe is used for 98 times, the smelting steel is Q690D high-strength steel, the furnace number is H212-05063, and the station entering temperature of molten steel is 1596 ℃; during smelting, molten steel erodes the castable 1 to the position of the monitoring pipe 41, the monitoring pipe 41 is melted, at the moment, the gas is exhausted from the melted position, and the flowmeter42 begin recording the value and transmitting to the RH furnace control system when the indication of the flow meter 42 is from 0Nm3Increasing the L to 6Nm3And when the pressure of molten steel is lower than the preset pressure, the RH furnace emergency repressing system injects pressure into the vacuum tank to return the molten steel into the steel ladle, the smelting operation is stopped, an operator checks and confirms the dip pipe, the castable 1 is corroded by the molten steel, the monitoring pipe 41 is exposed outside, an external air source connected with the monitoring pipe 41 is immediately closed, and the dip pipe is subjected to offline treatment.
Experimental example 2:
the installation and use method of the monitoring device provided in embodiment 2 includes the following steps:
s1, after a steel liner 2 of a dip pipe is provided with a working layer refractory 3, tamping materials are filled between the steel liner 2 and the working layer refractory 3, and a monitoring pipe 41 is fixed in a castable material, wherein in the embodiment, the inner diameter of the monitoring pipe 41 is 3.5mm, the thickness of the pipe wall is 1.5mm, the upper end of the monitoring pipe 41 is connected with an external gas source (a nitrogen gas source or an inert gas source), the monitoring pipe 41 is wound around the bottom end of the steel liner 2 for a circle and is 2.5cm away from the bottom end of the steel liner 2, a flowmeter 42 is fixed on the monitoring pipe 41 and is close to the external gas source, after connection, a pressure test and sealing are carried out on a monitoring assembly, after the gas leakage of a pipeline is ensured, the dip pipe is subjected to masonry of the castable material 1, part of the monitoring pipe 41 is poured in the castable material 1, and the part of the monitoring pipe 41 exposed out of the castable material 1 is wrapped by asbestos;
s2, after the castable 1 of the dip pipe is dried, the dip pipe is integrally welded at the bottom of a vacuum tank (the serial number of an upper tank/a lower tank of the vacuum tank is 10/25), and gas (nitrogen or inert gas) provided by an external gas source is introduced into the monitoring pipe 41, wherein in the embodiment, the input pressure, namely the pressure in the monitoring pipe 41, is 0.35 MPa;
s3, after the vacuum tank is baked, performing smelting operation on the vacuum tank on the line, wherein the lower end erosion condition is severe when the dip pipe is used for 98 times, the smelting steel is X56M pipeline steel, the furnace number is H213-06321, and the arrival temperature of molten steel is 1600 ℃; during smelting, the molten steel erodes the castable 1 to the position of the monitoring pipe 41, the monitoring pipe 41 is melted, at the moment, the gas is exhausted from the melted position, the flow meter 42 starts to record the numerical value and transmits the numerical value to the RH furnace control system, and when the numerical value of the flow meter 42 is from 0Nm3L rises to6Nm3And when the pressure of molten steel is lower than the preset pressure, the RH furnace emergency repressing system injects pressure into the vacuum tank to return the molten steel into the steel ladle, the smelting operation is stopped, an operator checks and confirms the dip pipe, the castable 1 is corroded by the molten steel, the monitoring pipe 41 is exposed outside, an external air source connected with the monitoring pipe 41 is immediately closed, and the dip pipe is subjected to offline treatment.
By combining the two experimental examples, the monitoring device provided by the invention effectively protects the overall safety of a vacuum system, completely avoids serious production accidents such as slag absorption and the like after a steel liner is melted due to the corrosion of the refractory material or castable of the dip pipe, is simple in arrangement, economical and strong in operability, is suitable for monitoring and protecting all similar high-temperature refractory materials in the corrosion environment, and provides real-time monitoring of the dip pipe in a visual field blind area. The data of the flowmeter is connected to the RH furnace control system and linked with the RH furnace emergency repressing system, the repressing system can be started when the flowmeter reaches the indication without manual control, and the molten steel and the vacuum system are effectively protected.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (8)
1. A monitoring device for a dip pipe of an RH furnace is characterized by comprising a dip pipe and a monitoring component,
the dip pipe comprises a castable, a steel liner and a working layer refractory material from outside to inside in sequence,
the monitoring assembly comprises a flow meter and a monitoring pipe, the monitoring pipe is connected with an external gas source, the tail end of the monitoring pipe is sealed, the monitoring pipe is located in the casting material and located below the steel liner, the flow meter is fixed at the connecting position of the monitoring pipe and the external gas source, and the flow meter is connected to the RH furnace control system.
2. The monitoring device of claim 1, wherein the monitoring tube is annular and coaxial with the steel bladder.
3. The monitoring device as claimed in claim 2, wherein the monitoring tube is located 2-3 cm below the bottom end of the steel liner, the inner diameter of the monitoring tube is 3-5 mm, and the thickness of the tube wall is 1-1.5 mm.
4. The monitoring device according to claim 1, wherein the pressure in the monitoring tube is 0.2 to 0.5 MPa.
5. The monitoring device of claim 1, wherein a portion of the upper end of the monitoring tube extending outside the castable material is wrapped with asbestos.
6. The monitoring device of claim 1, wherein the external gas source to which the monitoring tube is connected is a nitrogen gas source or an inert gas source.
7. The monitoring device of claim 1, wherein the flow meter is a flow transmitter.
8. A method for using the monitoring device as claimed in claims 1 to 7, characterized in that the method comprises the following steps:
introducing nitrogen or inert gas into the monitoring device, keeping the air pressure at 0.2-0.5 MPa, connecting the flow meter to the RH furnace control system and interlocking with the RH furnace emergency re-pressure system, and when the flow count value is more than 6Nm in the molten steel smelting process3And when the pressure is over the preset value,/h, the RH furnace emergency repressurization system is started in a linkage manner, the vacuum tank is pressurized, so that the molten steel in the vacuum tank returns to a steel ladle, an operator confirms the etching condition of the dip pipe on site, and the dip pipe is taken off line for treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210009055.3A CN114317895A (en) | 2022-01-06 | 2022-01-06 | RH furnace dip pipe erosion monitoring device and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210009055.3A CN114317895A (en) | 2022-01-06 | 2022-01-06 | RH furnace dip pipe erosion monitoring device and using method thereof |
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| JP2016176866A (en) * | 2015-03-20 | 2016-10-06 | 株式会社ガスター | Method and device for leakage inspection |
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| CN212634307U (en) * | 2020-06-28 | 2021-03-02 | 营口市瑞福来耐火材料有限公司 | Fusing type early warning air brick |
| CN212761101U (en) * | 2020-07-14 | 2021-03-23 | 营口市瑞福来耐火材料有限公司 | Self-cooled early warning air brick |
| CN113063547A (en) * | 2021-03-22 | 2021-07-02 | 攀钢集团攀枝花钢钒有限公司 | RH furnace vacuum system leakage searching method |
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2022
- 2022-01-06 CN CN202210009055.3A patent/CN114317895A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943149A (en) * | 2012-11-07 | 2013-02-27 | 河北省首钢迁安钢铁有限责任公司 | Device and method for judging leakage amount of ladle bottom blowing pipeline |
| CN103712816A (en) * | 2013-12-25 | 2014-04-09 | 马钢(集团)控股有限公司 | System checking method for substandard RH furnace vacuum degree |
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| CN113063547A (en) * | 2021-03-22 | 2021-07-02 | 攀钢集团攀枝花钢钒有限公司 | RH furnace vacuum system leakage searching method |
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Application publication date: 20220412 |