CN112226573A - Control method for preventing pear-shaped furnace lining of converter - Google Patents
Control method for preventing pear-shaped furnace lining of converter Download PDFInfo
- Publication number
- CN112226573A CN112226573A CN202010946780.4A CN202010946780A CN112226573A CN 112226573 A CN112226573 A CN 112226573A CN 202010946780 A CN202010946780 A CN 202010946780A CN 112226573 A CN112226573 A CN 112226573A
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- furnace lining
- converter
- pear
- molten pool
- lining
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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
- C21C5/44—Refractory linings
-
- 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
- C21C5/4606—Lances or injectors
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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 control method for preventing pear-shaped furnace lining of a converter, which reduces the direct erosion of molten steel to magnesium carbon bricks of a molten pool, eliminates the forming factor of the pear-shaped furnace lining and effectively prevents the formation of the pear-shaped furnace lining by increasing the thickness of the molten pool furnace lining, moving the position of an outer ring bottom blowing air brick inwards and reducing the included angle of an oxygen lance nozzle, so that the normal furnace shape is maintained during the whole service period of the converter, the safe operation of a furnace body is ensured, the economic and technical indexes of the converter are improved, and the strong guarantee is provided for the stable operation of steelmaking production.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a control method for preventing a pear-shaped furnace lining of a converter.
Background
The change of the furnace shape of the converter during the service period is irregular, the erosion of local positions such as the furnace bottom, a circular seam and the like is too fast due to the influence of factors such as unstable molten iron components, large silicon content and phosphorus content fluctuation, difficult operation in the smelting process and the like, so that the shape of a molten pool is irregular, particularly, the erosion is serious in the middle and later periods of the service of the converter production, the pear-shaped furnace lining condition always appears, see fig. 1, the lowest point reaches below 400mm, and great potential safety hazard is brought to the production. Meanwhile, the pear-shaped furnace lining influences decarburization and dephosphorization reactions of a molten pool in the smelting process, so that economic indexes such as a final-point one-time drawing rate, component temperature hit rate and the like are influenced.
The invention provides a control method for preventing the pear-shaped furnace lining of the converter, which can effectively prevent the pear-shaped furnace lining from being generated and solve a series of problems caused by the pear-shaped furnace lining.
Through search query, the document and the invention patent which are the same as or similar to the patent do not exist.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a control method for preventing a pear-shaped furnace lining of a converter, which can effectively prevent the pear-shaped furnace lining from being generated, prevent accidents from occurring, improve the furnace life of the converter and various economic and technical indexes, and solve a series of problems in the background art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a control method for preventing pear-shaped furnace lining of a converter comprises the following steps:
1) increasing the thickness of the lining of the molten bath
The thickness of the furnace lining of the molten pool is increased by 100mm-150 mm;
2) position of internally-moved external ring bottom-blown air brick
Moving the position of the outer ring bottom-blown air brick inwards for a certain distance to ensure that the ratio of the position of the bottom-blown air brick to the inner diameter of the molten pool is less than 0.60D;
3) reducing the included angle of the oxygen lance nozzle
The original oxygen lance nozzle with the included angle of 15.5 degrees is optimized into the oxygen lance nozzle with the included angle of 14.5 degrees through calculation and demonstration.
Further, in the step 1), the thickness of the lining of the molten pool is increased from 950mm-1000mm to 1100 mm.
Further, in the step 2), the ratio of the position of the bottom-blowing gas brick to the inner diameter of the molten pool is 0.56D.
Furthermore, the diameter of the optimized outer ring bottom blowing air brick is phi 3257mm, and the diameter of the molten pool is phi 5780mm after the thickness of the molten pool is increased.
Compared with the prior art, the invention has the beneficial technical effects that:
through three kinds of optimization control of increasing the thickness of the furnace lining of the molten pool, moving the position of the bottom-blown air brick of the outer ring inwards and reducing the included angle of the oxygen lance nozzle, the direct erosion of molten steel to the magnesia carbon brick of the molten pool is reduced, the forming factor of the pear-shaped furnace lining is eliminated, the pear-shaped furnace lining is effectively prevented from being formed, the normal furnace type is maintained during the whole furnace service period, the safe operation of the furnace body is ensured, the economic and technical indexes of the converter are improved, and the powerful guarantee is provided for the stable operation of the steelmaking production.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a thickness measuring diagram of pear-shaped furnace lining of 6650 furnaces in campaign
FIG. 2 is a furnace diagram of increasing the thickness of the lining of the molten bath
FIG. 3 is a furnace body diagram of the position of the internally-moved and externally-moved ring bottom-blown air brick.
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.
A control method for preventing pear-shaped furnace lining of a converter comprises the following steps:
1. increasing the thickness of the lining of the molten bath
The brick type built at the furnace lining molten pool part is optimally designed, and the thickness of the furnace lining of the molten pool is increased by 100mm-150 mm. As shown in FIG. 2, the red line in the graph is the original thickness of the molten bath lining, and the black line is the optimized thickness of the molten bath lining. The length of the optimally designed furnace lining brick of the molten pool is increased by 100mm-150mm, so that the furnace lining of the molten pool in the later period of the furnace service is maintained at a proper and safe thickness, and the metallurgical effect in the later period of the furnace service is ensured; meanwhile, the thickness of the furnace bricks at the slag line part is thickened, the condition that the furnace shape is not correct due to the corrosion of the slag line is relieved, and the pear-shaped furnace lining is effectively relieved, so that a good stirring effect is formed in the smelting process by bottom blowing.
2. Position of internally-moved external ring bottom-blown air brick
In the smelting process of the converter, when bottom blowing gas enters molten steel through the air brick, the temperature is directly increased from the normal temperature of about 25 ℃ to 1300-1650 ℃, the volume is sharply increased, the bottom blowing gas is stirred and contacts the molten steel to impact surrounding molten pool magnesia carbon bricks, and the corrosion speed of the magnesia carbon bricks at the impact part is greatly increased compared with that of the magnesia carbon bricks at other parts. The ratio of the diameter of the bottom-blown air brick to the diameter of the molten pool is less than 0.60D, so that the erosion speed of the magnesia carbon brick at the impact part can be reduced. The ratio of the diameter of the original bottom-blown gas brick position to the diameter of the molten pool is 0.64D, and the research finds that the ratio is one of the main reasons for leading to the pear-shaped furnace lining.
Therefore, the position of the air brick blown to the bottom of the outer ring is moved inwards. The diameter of the original outer ring bottom-blown air brick is phi 3809, the diameter of the molten pool is phi 5980mm, and the ratio of the position of the bottom-blown air brick to the inner diameter of the molten pool is 0.64D; by moving the positions of the outer ring bottom-blown air bricks inwards by the distance of 2 air bricks, as shown in fig. 3, the diameter of the optimized outer ring bottom-blown air brick is phi 3257mm, the diameter of a molten pool is phi 5780mm after the thickness of the molten pool is increased, the ratio of the position of the bottom-blown air brick to the inner diameter of the molten pool is 0.56D and is less than 0.60D, the impact of bottom-blown gas on surrounding molten pool magnesia carbon bricks is effectively relieved, the corrosion speed is reduced, and the great relieving effect on the formation of a pear-shaped furnace lining is achieved.
3. Reducing the included angle of the oxygen lance nozzle
In the production process of the converter, the included angle of the oxygen lance is large, the impact area on molten steel in a molten pool is large, the molten steel at the corresponding part of a slag line of the molten pool is directly impacted when the lance position is high, the erosion rate of the stirred molten steel on magnesia carbon bricks at the part of the slag line is increased, and researches find that the included angle is one of important reasons for leading to a pear-shaped furnace lining.
Therefore, the included angle of the oxygen lance nozzle is optimized and reduced. The included angle of the original oxygen lance nozzle is 15.5 degrees, the original oxygen lance nozzle is optimized into the oxygen lance nozzle with the included angle of 14.5 degrees through calculation and demonstration, the decarburization speed in the converter smelting process is slightly increased through practical experiment use, the influence on dephosphorization is small, and the requirements of on-site production and smelting are met. After the included angle of the oxygen lance nozzle is optimized and the high lance position ratio is controlled, the formation of the pear-shaped furnace lining is effectively relieved.
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 (4)
1. A control method for preventing pear-shaped furnace lining of a converter is characterized by comprising the following steps:
1) increasing the thickness of the lining of the molten bath
The thickness of the furnace lining of the molten pool is increased by 100mm-150 mm;
2) position of internally-moved external ring bottom-blown air brick
Moving the position of the outer ring bottom-blown air brick inwards for a certain distance to ensure that the ratio of the position of the bottom-blown air brick to the inner diameter of the molten pool is less than 0.60D;
3) reducing the included angle of the oxygen lance nozzle
The original oxygen lance nozzle with the included angle of 15.5 degrees is optimized into the oxygen lance nozzle with the included angle of 14.5 degrees through calculation and demonstration.
2. The control method for preventing the pyriform lining of the converter according to claim 1, wherein in the step 1), the thickness of the furnace lining of the molten bath is increased from 950mm to 1000mm to 1100 mm.
3. The method according to claim 1, wherein in the step 2), the ratio of the position of the bottom-blowing gas brick to the inner diameter of the molten bath is 0.56D.
4. The control method for preventing the pyriform lining of the converter according to claim 3, wherein the diameter of the optimized position of the outer ring bottom-blowing air brick is phi 3257mm, and the diameter of the molten pool is phi 5780mm after the thickness of the molten pool is increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010946780.4A CN112226573A (en) | 2020-09-10 | 2020-09-10 | Control method for preventing pear-shaped furnace lining of converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010946780.4A CN112226573A (en) | 2020-09-10 | 2020-09-10 | Control method for preventing pear-shaped furnace lining of converter |
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| CN112226573A true CN112226573A (en) | 2021-01-15 |
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| CN202010946780.4A Pending CN112226573A (en) | 2020-09-10 | 2020-09-10 | Control method for preventing pear-shaped furnace lining of converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113234884A (en) * | 2021-04-23 | 2021-08-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for solving interference between positions of top-blown gas and bottom-blown lance of converter |
| CN114350884A (en) * | 2022-01-07 | 2022-04-15 | 鞍钢股份有限公司 | Bottom blowing element of combined blown converter and gas supply method |
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| KR20030054474A (en) * | 2001-12-26 | 2003-07-02 | 주식회사 포스코 | Method For Decreasing the Wear Rate of Tuyere in Converter |
| CN101613781A (en) * | 2009-07-24 | 2009-12-30 | 莱芜钢铁股份有限公司 | A kind of bottom-blown air brick of top and bottom repeatedly blown converter and mounting structure thereof |
| CN101993969A (en) * | 2009-08-21 | 2011-03-30 | 宝山钢铁股份有限公司 | Converter bottom blowing air brick and using method thereof |
| CN106148635A (en) * | 2015-03-31 | 2016-11-23 | 鞍钢股份有限公司 | Converter segment part repairing method |
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2020
- 2020-09-10 CN CN202010946780.4A patent/CN112226573A/en active Pending
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| KR20030054474A (en) * | 2001-12-26 | 2003-07-02 | 주식회사 포스코 | Method For Decreasing the Wear Rate of Tuyere in Converter |
| CN101613781A (en) * | 2009-07-24 | 2009-12-30 | 莱芜钢铁股份有限公司 | A kind of bottom-blown air brick of top and bottom repeatedly blown converter and mounting structure thereof |
| CN101993969A (en) * | 2009-08-21 | 2011-03-30 | 宝山钢铁股份有限公司 | Converter bottom blowing air brick and using method thereof |
| CN106148635A (en) * | 2015-03-31 | 2016-11-23 | 鞍钢股份有限公司 | Converter segment part repairing method |
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| 山钢集团日照有限公司炼钢部: "新型转炉炉衬综合砌筑的优化研究", 《山西冶金》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113234884A (en) * | 2021-04-23 | 2021-08-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for solving interference between positions of top-blown gas and bottom-blown lance of converter |
| CN114350884A (en) * | 2022-01-07 | 2022-04-15 | 鞍钢股份有限公司 | Bottom blowing element of combined blown converter and gas supply method |
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Application publication date: 20210115 |
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