CN111500806A - Method for improving comprehensive furnace-entering grade by adding waste steel into blast furnace - Google Patents
Method for improving comprehensive furnace-entering grade by adding waste steel into blast furnace Download PDFInfo
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- CN111500806A CN111500806A CN202010408847.9A CN202010408847A CN111500806A CN 111500806 A CN111500806 A CN 111500806A CN 202010408847 A CN202010408847 A CN 202010408847A CN 111500806 A CN111500806 A CN 111500806A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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Abstract
The invention discloses a method for improving the comprehensive furnace-entering grade by adding waste steel into a blast furnace, which comprises the following steps: firstly, evaluating each part of a feeding system, formulating a raw material granularity standard suitable for a blast furnace, and detecting chemical components and physical characteristics of raw materials; secondly, optimizing and modifying the charging sequence of the blast furnace, and selecting a reasonable charging sequence by combining the characteristics of equipment below a blast furnace groove; the blast furnace operation system is optimized and adjusted, and the blast furnace operation system is correspondingly adjusted by combining the effects generated in the steps.
Description
Technical Field
The invention belongs to the field of blast furnace smelting, and particularly relates to a method for improving comprehensive furnace-entering grade by adding waste steel into a blast furnace.
Background
In the existing life, most domestic blast furnaces are used for smelting ordinary ores, the method for improving smelting strength of enterprises is basically the same at present, the yield of molten iron is increased by increasing blast volume and oxygen enrichment, the domestic vanadium titano-magnetite smelting enterprises at present climb steel, bear steel, build dragon, Chuanwei, Delsheng and Dabai steel, the content of TiO2 in slag is different from 12% to 22%, and the blast volume and the oxygen enrichment are all used for increasing the yield of the molten iron.
However, because the vanadium titano-magnetite smelting slag amount is large, the grade is low, the yield increase effect is limited, and simultaneously, the vanadium titano-magnetite smelting and the common ore smelting slag making system and the thermal system have great difference, the adding of waste steel and iron under the groove can influence the stable and smooth operation of the blast furnace, and the comprehensive smelting furnace grade of the vanadium titano-magnetite is 2 to 5 percent lower than that of the common ore, the blast furnace production can not be further excavated only by increasing the blast volume and the oxygen enrichment capacity, and a large amount of gas flow erodes the furnace wall, which is not beneficial to the maintenance of the cooling wall, directly influences the service life of the blast furnace, and simultaneously, when the blast volume and the oxygen enrichment capacity are increased to a certain degree, the maintenance difficulty of the blast furnace taphole is increased, the molten iron circulation erodes the furnace cylinder more seriously, the safe production of the blast furnace is influenced, in addition, the decreased.
The invention content is as follows:
the invention aims to solve the problems in the prior art by providing a method for improving the comprehensive furnace-entering grade by adding waste steel into a blast furnace.
In order to solve the above problems, the present invention provides a technical solution:
a method for improving the comprehensive furnace feeding grade by adding waste steel into a blast furnace comprises the following steps:
s1: firstly, evaluating each part of a feeding system, formulating a raw material granularity standard suitable for a blast furnace, and detecting chemical components and physical characteristics of raw materials;
s2: secondly, optimizing and modifying the charging sequence of the blast furnace, and selecting a reasonable charging sequence by combining the characteristics of equipment below a blast furnace groove;
s3: and then, optimizing and adjusting the blast furnace operation system, and correspondingly adjusting the blast furnace operation system by combining the actions generated in the steps.
Preferably, in step S1, the particle size of the raw material used in the blast furnace is measured according to the following particle size standards: 8-80 mm; the proportion of less than 8mm or more than 80mm should be less than 5%, and the ultimate maximum particle size should be less than 120 mm.
Preferably, in step S1, the chemical components of the raw materials used in the blast furnace are detected, and the specific ratios of the detected components are as follows: TFe is more than or equal to 85 percent, S is less than or equal to 0.3 percent, and P is less than or equal to 0.3 percent.
Preferably, in step S1, the physical characteristics of the raw material for blast furnace are detected, and the detected physical characteristics are in a block shape, while ensuring no sharp edges.
Preferably, in step S2, in combination with the characteristics of the equipment under the blast furnace trough, the charging sequence should be: sintering 1 → ore block → coke block → sinter 2 → pellet 1 → pellet 2 → (raw ore + scrap iron and steel) → sinter 3, and simultaneously ensuring that the raw ore and the scrap iron and steel are loaded together, arranging the scrap iron and steel to the rear section and entering the blast furnace, and simultaneously arranging the material distribution position close to the center of the blast furnace.
Preferably, in step S3, the operation schedule of the blast furnace is optimally adjusted, and the temperature of the molten iron is appropriately raised after the overall grade is raised, so as to ensure sufficient heat inside the hearth and maintain smooth operation of the blast furnace.
Preferably, in step S3, the blast furnace operation schedule is optimally adjusted so that the number of tapping operations is increased once before the furnace, and is increased from sixteen times per day to seventeen times per day.
The invention has the beneficial effects that: according to the invention, the blast volume and the oxygen enrichment are properly increased, and the charging procedure is modified at the same time of strengthening smelting, so that the technology of adding waste steel and iron under the blast furnace tank of the vanadium titano-magnetite is developed, the purpose of improving the comprehensive furnace entering grade is achieved, and the blast furnace is enabled to operate safely while being efficient and long in service life.
Description of the drawings:
for ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is a schematic flow chart of the operation of the present invention.
The specific implementation mode is as follows:
as shown in fig. 1, the following technical solutions are adopted in the present embodiment:
example (b):
a method for improving the comprehensive furnace feeding grade by adding waste steel into a blast furnace comprises the following steps:
s1: firstly, evaluating each part of a feeding system, formulating a raw material granularity standard suitable for a blast furnace, and detecting chemical components and physical characteristics of raw materials;
s2: secondly, optimizing and modifying the charging sequence of the blast furnace, and selecting a reasonable charging sequence by combining the characteristics of equipment below a blast furnace groove;
s3: and then, optimizing and adjusting the blast furnace operation system, and correspondingly adjusting the blast furnace operation system by combining the actions generated in the steps.
In step S1, the particle size of the raw material used by the blast furnace is detected, and the particle size standard is as follows: 8-80 mm; the proportion of less than 8mm or more than 80mm should be less than 5%, and the ultimate maximum particle size should be less than 120 mm.
In step S1, the chemical components of the raw materials used in the blast furnace are detected, and the specific ratios of the detected components are as follows: TFe is more than or equal to 85 percent, S is less than or equal to 0.3 percent, and P is less than or equal to 0.3 percent.
In step S1, the physical characteristics of the raw material used by the blast furnace are detected, and the detected physical characteristics are block-shaped, and no sharp edge is ensured, so that the damage of the sharp edge to the related equipment and the unnecessary loss are avoided.
In step S2, in combination with the characteristics of the equipment below the blast furnace trough, the charging sequence should be: sintering 1 → ore block → coke block → sinter 2 → pellet 1 → pellet 2 → (raw ore + scrap iron and steel) → sinter 3, and simultaneously, the raw ore and the scrap iron and steel are ensured to be loaded together, and the scrap iron and steel is arranged to the rear section to enter the blast furnace, and meanwhile, the material distribution position is close to the center of the blast furnace, and through loading the raw ore and the scrap iron and steel together, the problems that the weighing hopper under the groove and the main belt are worn by the scrap iron and steel and the like are successfully solved.
In step S3, the operation system of the blast furnace is optimally adjusted, and after the overall grade is improved, the temperature of the molten iron is appropriately increased to ensure abundant heat inside the hearth, so as to maintain smooth operation of the blast furnace, after the overall smelting grade of the vanadium titano-magnetite is improved, the abundant heat inside the hearth needs to be maintained, and simultaneously the condition of the furnace is prevented from being influenced by over-reduction of TiO2, and after the temperature of the molten iron is appropriately increased, the abundant heat inside the hearth needs to be ensured, so as to maintain smooth operation of the blast furnace, and the condition of over-reduction of TiO2 is avoided.
In step S3, the operation system of the blast furnace is optimally adjusted, and the number of tapping times should be increased from sixteen times per day to seventeen times per day before the furnace, which is beneficial to reducing the accumulation of iron slag and avoiding the excessive reduction of titanium slag.
The beneficial effects of the invention are shown by the following specific examples:
the specific embodiment is as follows: a method for improving the comprehensive furnace feeding grade by adding waste steel into a blast furnace comprises the following steps:
s1: firstly, evaluating each part of a feeding system, formulating a raw material granularity standard suitable for a blast furnace, and detecting chemical components and physical characteristics of raw materials;
s2: secondly, optimizing and modifying the charging sequence of the blast furnace, and selecting a reasonable charging sequence by combining the characteristics of equipment below a blast furnace groove;
s3: and then, optimizing and adjusting the blast furnace operation system, and correspondingly adjusting the blast furnace operation system by combining the actions generated in the steps.
Influence of blast furnace addition of scrap iron and steel on grade
The total consumption material batch of 191 batches of the blast furnace charging, the usage amount of the austenite balls is 3.750 t/batch, the usage amount of the outsourcing vanadium balls is 1.140 t/batch, the high vanadium burning usage amount is 9.045 t/batch, the usage amount of the Newman lump ore is 0.980 t/batch, and the usage amount of the waste steel is 0.300 t/batch, as can be seen from the above table, the comprehensive charging grade of the waste steel without being added is 56.30%, the comprehensive charging grade after being added is 56.97%, the grade is increased by 0.67%, the grade is increased by 1%, the yield is increased by 3%, the coke ratio is reduced by 2%, the yield when the waste steel is not used is 1750t/d, and the daily yield after the waste steel is used is increased by 1750t/d × [ (56.97% -56.30%)/× 3%/1%) ] -35.17 t/d.
While there have been shown and described what are at present considered to be the fundamental principles of the invention and its essential features and advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (7)
1. A method for improving the comprehensive furnace feeding grade by adding waste steel into a blast furnace is characterized by comprising the following steps:
s1: firstly, evaluating each part of a feeding system, formulating a raw material granularity standard suitable for a blast furnace, and detecting chemical components and physical characteristics of raw materials;
s2: secondly, optimizing and modifying the charging sequence of the blast furnace, and selecting a reasonable charging sequence by combining the characteristics of equipment below a blast furnace groove;
s3: and then, optimizing and adjusting the blast furnace operation system, and correspondingly adjusting the blast furnace operation system by combining the actions generated in the steps.
2. The method for upgrading the integrated charging grade by adding iron and steel scrap into a blast furnace according to claim 1, wherein in the step S1, the particle size of the raw material used in the blast furnace is detected according to the following particle size standards: 8-80 mm; the proportion of less than 8mm or more than 80mm should be less than 5%, and the ultimate maximum particle size should be less than 120 mm.
3. The method for improving the comprehensive charging grade by adding the waste steel into the blast furnace according to claim 1, wherein in the step S1, chemical components of raw materials used by the blast furnace are detected, and the specific detected components are as follows: TFe is more than or equal to 85 percent, S is less than or equal to 0.3 percent, and P is less than or equal to 0.3 percent.
4. The method as claimed in claim 1, wherein in step S1, the physical characteristics of the raw materials used in the blast furnace are detected to be blocky, and no sharp edge is observed.
5. The method for improving the comprehensive charging grade by adding the scrap iron and steel into the blast furnace according to claim 1, wherein in the step S2, the charging sequence is as follows in combination with the characteristics of equipment below a blast furnace trough: sintering 1 → ore block → coke block → sinter 2 → pellet 1 → pellet 2 → (raw ore + scrap iron and steel) → sinter 3, and simultaneously ensuring that the raw ore and the scrap iron and steel are loaded together, arranging the scrap iron and steel to the rear section and entering the blast furnace, and simultaneously arranging the material distribution position close to the center of the blast furnace.
6. The method as claimed in claim 1, wherein the operation schedule of the blast furnace is optimally adjusted in step S3, and the temperature of the molten iron is properly raised after the overall grade is raised to ensure sufficient heat inside the hearth, thereby maintaining smooth operation of the blast furnace.
7. The method of claim 1, wherein in step S3, the operating schedule of the blast furnace is optimally adjusted to increase the tapping frequency before the furnace from sixteen times per day to seventeen times per day.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115109875A (en) * | 2021-03-19 | 2022-09-27 | 上海梅山钢铁股份有限公司 | Control method for adding scrap steel into blast furnace |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE59107245D1 (en) * | 1990-10-16 | 1996-02-29 | Voest Alpine Ind Anlagen | Process and plant for the production of liquid steel from scrap |
| KR20110054059A (en) * | 2008-09-16 | 2011-05-24 | 가부시키가이샤 아이에스티씨 | Process for producing molten iron |
| CN107287373A (en) * | 2017-06-30 | 2017-10-24 | 河南龙成煤高效技术应用有限公司 | A kind of steel scrap considers the device and method into blast furnace ironmaking to be worth doing |
| CN110157846A (en) * | 2019-06-26 | 2019-08-23 | 武汉钢铁有限公司 | A kind of method that steel scrap is added in the big proportion of blast furnace |
| CN110628980A (en) * | 2019-08-27 | 2019-12-31 | 江苏省沙钢钢铁研究院有限公司 | Smelting method for improving scrap steel ratio by preheating scrap steel in iron ladle through oxygen combustion gun |
| CN111471818A (en) * | 2020-03-17 | 2020-07-31 | 成渝钒钛科技有限公司 | Blast furnace production increasing technology for smelting vanadium titano-magnetite |
-
2020
- 2020-05-14 CN CN202010408847.9A patent/CN111500806A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE59107245D1 (en) * | 1990-10-16 | 1996-02-29 | Voest Alpine Ind Anlagen | Process and plant for the production of liquid steel from scrap |
| KR20110054059A (en) * | 2008-09-16 | 2011-05-24 | 가부시키가이샤 아이에스티씨 | Process for producing molten iron |
| CN107287373A (en) * | 2017-06-30 | 2017-10-24 | 河南龙成煤高效技术应用有限公司 | A kind of steel scrap considers the device and method into blast furnace ironmaking to be worth doing |
| CN110157846A (en) * | 2019-06-26 | 2019-08-23 | 武汉钢铁有限公司 | A kind of method that steel scrap is added in the big proportion of blast furnace |
| CN110628980A (en) * | 2019-08-27 | 2019-12-31 | 江苏省沙钢钢铁研究院有限公司 | Smelting method for improving scrap steel ratio by preheating scrap steel in iron ladle through oxygen combustion gun |
| CN111471818A (en) * | 2020-03-17 | 2020-07-31 | 成渝钒钛科技有限公司 | Blast furnace production increasing technology for smelting vanadium titano-magnetite |
Non-Patent Citations (2)
| Title |
|---|
| 卢开成等: "梅钢2号高炉添加废钢生产实践", 《炼铁》 * |
| 林显刚等: "成渝钒钛科技有限公司高炉原料分级入炉生产实践", 《四川冶金》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115109875A (en) * | 2021-03-19 | 2022-09-27 | 上海梅山钢铁股份有限公司 | Control method for adding scrap steel into blast furnace |
| CN115109875B (en) * | 2021-03-19 | 2024-01-05 | 上海梅山钢铁股份有限公司 | Control method for adding scrap steel into blast furnace |
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