CN112226568A - Production control method for preventing sublance top furnace mouth - Google Patents
Production control method for preventing sublance top furnace mouth Download PDFInfo
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- CN112226568A CN112226568A CN202010988801.9A CN202010988801A CN112226568A CN 112226568 A CN112226568 A CN 112226568A CN 202010988801 A CN202010988801 A CN 202010988801A CN 112226568 A CN112226568 A CN 112226568A
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- converter
- furnace mouth
- sublance
- preventing
- control method
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4693—Skull removal; Cleaning of the converter mouth
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a production control method for preventing a sublance top furnace mouth, which reduces the furnace mouth reducing speed by controlling the splashing and slag overflow of a converter, reasonably reducing the cooling strength of a water-cooling furnace mouth, improving the turnover rate of the converter and properly improving the tapping temperature, properly controlling the verticality of the converter, adopting an optimized and innovative control method of controlling a carbon-pulling lance-lifting back-blowing furnace mouth process, regularly cleaning the furnace mouth by using a furnace raking machine and the like, effectively preventing the phenomenon of the sublance top furnace mouth from occurring, ensuring the normal operation of a sublance, and providing a powerful guarantee for improving the automatic control level for converter steelmaking.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a production control method for preventing a sublance top furnace mouth.
Background
The sublance is used as an important tool for realizing automatic control of the converter, but the phenomenon of a sublance top furnace mouth often occurs in the actual use process. The diameter of the furnace mouth of the new converter is 3600mm, the distance between the auxiliary gun mouth and the center of the oxygen lance mouth is 1100mm, the distance between the auxiliary gun body and the furnace mouth is 700mm, and a larger surplus space is provided, so that the safety measurement of the auxiliary gun can be normally realized. However, in the middle and later stages of the furnace service in the production process, due to reasons of splashing, slag overflow, too strong water cooling of the furnace mouth and the like, "furnace mouth expansion" is caused, as shown in fig. 1, the furnace mouth is made small, when the furnace mouth is small to a certain degree, the auxiliary gun head can be pushed onto the furnace mouth in the auxiliary gun measurement process, so that the auxiliary gun is subjected to weightlessness and overload faults, the measurement is failed, and even the subsequent auxiliary gun measurement is influenced. As shown in fig. 2, (a) and (b) are respectively the weight loss curve and the overload curve of the sublance at the moment of the top furnace mouth of the sublance, the weight loss is as low as 0Kg, the overload weight is 945Kg, and the weight range of the sublance is designed to be 180Kg-500Kg during the operation process of the sublance, so that the weight of the sublance can be seriously weightless at the moment of the top furnace mouth, and then the sublance is overloaded, a fault signal is sent out, and the measurement fails; meanwhile, the sublance holder, the contact block and the probe are inclined, and the connection between the holder and the sublance head is released, water leakage and the like, so that the measurement of the subsequent furnace frequency is influenced.
Disclosure of Invention
The invention aims to provide a production control method for preventing a sublance top furnace mouth, which can effectively prevent the occurrence of the sublance top furnace mouth, prevent the effective measurement of a sublance in the production process of a converter from being influenced, provide rapid data support and guarantee for realizing automatic control of the converter and solve a series of problems in the background technology.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a production control method for preventing a sublance top furnace mouth, which comprises the following steps:
1) controlling the splashing and slag overflowing of the converter;
2) the cooling strength of the water-cooling furnace mouth is reasonably reduced;
3) the turnover rate of the converter is improved and the tapping temperature is properly improved;
4) properly controlling the converter verticality;
5) and the process control of a rear furnace mouth of a carbon pulling and lance lifting is adopted.
Further, the step 1) specifically includes:
raw material aspect: the quality of the steelmaking auxiliary material is improved; the stability of the molten iron is improved, the silicon content of the molten iron is controlled to be within the range of 0.02-0.08% as much as possible, and an operation control process is adopted when the silicon content of the molten iron is lower than or higher than the range, so that the splashing in the smelting process of the converter is prevented.
The operation control aspect: the automatic control level of the converter is improved, and the smelting process of the converter is accurately calculated and controlled; the operation control skill of the steel-smelting worker is improved, so that the steel-smelting worker can timely, accurately and effectively judge and control the converter smelting, and the splashing and slag overflowing rate is reduced.
Further, the step 2) specifically includes: the pressure of cooling water at the water-cooling furnace mouth of the converter is kept at about 0.50MPa, and the flow is controlled at 50-100Nm3The temperature difference between the inlet water and the outlet water is controlled to be 10-30 ℃.
Further, the step 4) specifically comprises controlling the converter verticality to be-1 degree in the converter smelting process.
Further, the step 5) specifically includes: after the carbon pulling and lance lifting are finished in the converter smelting, oxygen is used for carrying out the process operation of a lance opening, the vertical distance between a nozzle of the oxygen lance and the lance opening is determined by combining calculation and actual control, and the time of the lance opening is controlled to be 1 min.
Further, the method comprises the following steps: and (4) cleaning the furnace mouth periodically by using a furnace raking machine.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention reduces the furnace mouth reducing speed by controlling the splashing and the slag overflow of the converter, reasonably reducing the cooling strength of the water-cooled furnace mouth, improving the turnover rate of the converter and properly improving the tapping temperature, properly controlling the converter verticality, adopting the process control of the carbon-pulling lance-lifting rear-blowing furnace mouth, regularly cleaning the furnace mouth by using a furnace raking machine and other optimized and innovative control methods, effectively prevents the phenomenon of the top furnace mouth of the sublance, ensures the normal operation of the sublance, and provides powerful guarantee for improving the automatic control level of the converter steelmaking.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a view showing a relationship between positions of a top port of a sublance;
FIG. 2 is a graph of a top port of a sublance;
FIG. 3 is a schematic view of a converter blowing angle of-1 deg.;
FIG. 4 is a schematic view of the position of the tuyere;
FIG. 5 is a schematic view of the position of the furnace opening.
Detailed Description
So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings.
1. Control of splashing and slag overflow of converter
The splashing and the slag overflow of the converter are reduced. Raw material aspect: improving the quality of steelmaking auxiliary materials (lime, light-burned dolomite, raw dolomite, iron shot, slagging agent and the like); the stability of the molten iron is improved, the silicon content of the molten iron is controlled within the range of 0.02-0.08% as much as possible, and a special operation control process is adopted when the silicon content of the molten iron is lower than or higher than the range, so that the splashing in the smelting process of the converter is prevented. The operation control aspect: the automatic control level of the converter is improved, and the smelting process of the converter is accurately calculated and controlled; the operation control skill of the steel-smelting worker is improved, so that the steel-smelting worker can timely, accurately and effectively judge and control the converter smelting, and the splashing and slag overflowing rate is reduced. Through the control of the two aspects, the splashing and slag overflowing rate can be effectively reduced, so that the furnace mouth expanding speed is reduced, and the furnace mouth at the top of the sublance is prevented from being generated.
2. Reasonably reduce the cooling intensity of the water-cooling furnace mouth
The cooling intensity of the water-cooling furnace mouth is reasonably reduced. The pressure of cooling water at the water-cooling furnace mouth of the original converter is about 0.50MPa, and the flow rate is 230Nm3The temperature difference of inlet and outlet water is less than 5 ℃; the cooling water flow is too large, so that heat is rapidly taken away, and the furnace mouth part is supercooled. Through actual exploration of production, the pressure of cooling water at the water-cooling furnace mouth of the converter is kept at about 0.50MPa, and the flow is controlled at 50-100Nm3The temperature difference between the inlet water and the outlet water is reasonably controlled to be 10-30 ℃, so that the water-cooling furnace mouth plays a role of cooling the furnace mouth, the supercooling of the furnace mouth is prevented, the furnace mouth expansion speed is effectively reduced, and the occurrence of a sublance top furnace mouth is prevented.
3. Increase the turnover rate of the converter and properly increase the tapping temperature
The turnover rate of the converter is improved, and the shutdown time of the converter is reduced; if other factors influence the condition that the adjustment cannot be carried out, the centralized production mode can be adopted for carrying out the organizational production, and the phenomenon of furnace mouth expansion can be effectively relieved; meanwhile, the tapping temperature of the converter is properly increased, the speed of a furnace mouth expanding can be effectively reduced, and the top furnace mouth of the sublance is prevented from being generated. According to the statistics of different tapping temperatures, when the tapping temperature of the converter is averagely increased from about 1620 ℃ to about 1650 ℃, the speed of the furnace mouth expanding is greatly reduced, the furnace mouth jacking rate is reduced by about 90%, and when the tapping temperature is averagely increased to about 1680 ℃, the phenomenon of the furnace mouth jacking of a sublance caused by furnace mouth expanding can be basically eliminated; but the steel tapping temperature of various plants is required to be different, so that the overall organization production is required to meet the requirements of reducing the speed of a furnace mouth expanding as much as possible, preventing the top furnace mouth of the sublance from occurring and meeting the safety production requirements of corrosion and maintenance of a furnace body.
4. Properly controlling converter verticality
In the normal smelting process of the converter, the converter body is vertical to the ground, and the deviation allowable range is +/-2 degrees. Because the sublance measuring position is positioned at the middle position of 45 degrees between the tapping side of the converter and the trunnion at the left side, the perpendicularity of the converter is controlled at about-1 degrees in the smelting process of the converter, see fig. 3, the normal smelting of the converter is not influenced, a slightly larger space can be reserved between the sublance measuring position and the furnace mouth, and the top furnace mouth of the sublance can be properly relieved.
5. Process control of back-blowing furnace mouth by adopting carbon drawing and lance lifting
After the carbon pulling and lance lifting are finished in the converter smelting, oxygen is used for carrying out the process operation of a lance opening, the inner diameter of the furnace opening of a 240-ton converter is phi 3600mm, the included angle of an oxygen lance nozzle is 15 degrees, the expansion angle is 8 degrees, the calculation and the practical application are carried out according to the method, the vertical distance between the oxygen lance nozzle and the furnace opening is controlled to be 2800mm-3300mm (note: converters with different tonnages and different included angles of the oxygen lance nozzles are different in height control, the control distance can be determined by combining calculation and practical control, the best effect is ensured), the furnace opening blowing time is controlled to be about 1min, the effect of the furnace opening can be ensured, part of steel slag bonded at the furnace opening part can be blown off by high-flow-rate oxygen, the phenomenon of furnace opening expansion is effectively.
6. Use and take off stove machine regularly to clear up fire door
The fire door undersize, when the sublance measurement process can certainly push up the fire door, can only use and take off the stove machine and carry out the clearance operation to the fire door, see fig. 5, though waste time and energy, influence production operation, this is final, makes the means that the sublance can move, prevents that sublance from pushing up the fire door trouble and taking place, guarantees that whole operation is normal.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (6)
1. A production control method for preventing a sublance top furnace mouth is characterized by comprising the following steps:
1) controlling the splashing and slag overflowing of the converter;
2) the cooling strength of the water-cooling furnace mouth is reasonably reduced;
3) the turnover rate of the converter is improved and the tapping temperature is properly improved;
4) properly controlling the converter verticality;
5) and the process control of a rear furnace mouth of a carbon pulling and lance lifting is adopted.
2. The production control method for preventing the sublance top-furnace mouth according to claim 1, wherein the step 1) specifically comprises:
raw material aspect: the quality of the steelmaking auxiliary material is improved; the stability of the molten iron is improved, the silicon content of the molten iron is controlled to be in the range of 0.02-0.08% as much as possible, and an operation control process is adopted when the silicon content of the molten iron is lower than or higher than the range, so that the splashing in the smelting process of the converter is prevented;
the operation control aspect: the automatic control level of the converter is improved, and the smelting process of the converter is accurately calculated and controlled; the operation control skill of the steel-smelting worker is improved, so that the steel-smelting worker can timely, accurately and effectively judge and control the converter smelting, and the splashing and slag overflowing rate is reduced.
3. The production control method for preventing the sublance top-furnace mouth according to claim 1, wherein the step 2) specifically comprises: the pressure of cooling water at the water-cooling furnace mouth of the converter is kept at about 0.50MPa, and the flow is controlled at 50-100Nm3The temperature difference between the inlet water and the outlet water is controlled to be 10-30 ℃.
4. The production control method for preventing the sublance top furnace mouth according to the claim 1, wherein the step 4) specifically comprises controlling the converter verticality at-1 ° during the converter smelting process.
5. The production control method for preventing the sublance top-furnace mouth according to claim 1, wherein the step 5) specifically comprises: after the carbon pulling and lance lifting are finished in the converter smelting, oxygen is used for carrying out the process operation of a lance opening, the vertical distance between a nozzle of the oxygen lance and the lance opening is determined by combining calculation and actual control, and the time of the lance opening is controlled to be 1 min.
6. The production control method for preventing the sublance cupola mouth according to claim 1, comprising: and (4) cleaning the furnace mouth periodically by using a furnace raking machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010988801.9A CN112226568A (en) | 2020-09-18 | 2020-09-18 | Production control method for preventing sublance top furnace mouth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010988801.9A CN112226568A (en) | 2020-09-18 | 2020-09-18 | Production control method for preventing sublance top furnace mouth |
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| Publication Number | Publication Date |
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| CN112226568A true CN112226568A (en) | 2021-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010988801.9A Pending CN112226568A (en) | 2020-09-18 | 2020-09-18 | Production control method for preventing sublance top furnace mouth |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002332513A (en) * | 2001-05-09 | 2002-11-22 | Kobe Steel Ltd | Method for removing metal on nose of melting vessel furnace |
| CN1995405A (en) * | 2006-12-28 | 2007-07-11 | 鞍钢股份有限公司 | Treatment method for removing bonded steel slag at maintenance fire hole of top-bottom combined blown converter |
| CN105256092A (en) * | 2015-10-26 | 2016-01-20 | 攀钢集团攀枝花钢钒有限公司 | Treating method for bonding substances at converter opening of semi-steel smelting converter |
-
2020
- 2020-09-18 CN CN202010988801.9A patent/CN112226568A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002332513A (en) * | 2001-05-09 | 2002-11-22 | Kobe Steel Ltd | Method for removing metal on nose of melting vessel furnace |
| CN1995405A (en) * | 2006-12-28 | 2007-07-11 | 鞍钢股份有限公司 | Treatment method for removing bonded steel slag at maintenance fire hole of top-bottom combined blown converter |
| CN105256092A (en) * | 2015-10-26 | 2016-01-20 | 攀钢集团攀枝花钢钒有限公司 | Treating method for bonding substances at converter opening of semi-steel smelting converter |
Non-Patent Citations (5)
| Title |
|---|
| 吕学伟等: "《冶金概论》", 30 April 2017, 北京：冶金工业出版社 * |
| 孙斌煜等: "《钢铁生产概论》", 30 September 2017, 北京：冶金工业出版社 * |
| 徐志成: "2.1.1 副枪设备系统", 《科技创新与应用》 * |
| 罗莉萍等: "《炼钢生产》", 29 February 2016, 北京：冶金工业出版社 * |
| 谭牧田: "《氧气转炉炼钢设备》", 31 July 1983, 机械工业出版社 * |
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Application publication date: 20210115 |