CN112813208A - Operating method for large dead coke compost in digestion furnace hearth - Google Patents
Operating method for large dead coke compost in digestion furnace hearth Download PDFInfo
- Publication number
- CN112813208A CN112813208A CN202011575305.7A CN202011575305A CN112813208A CN 112813208 A CN112813208 A CN 112813208A CN 202011575305 A CN202011575305 A CN 202011575305A CN 112813208 A CN112813208 A CN 112813208A
- Authority
- CN
- China
- Prior art keywords
- furnace
- controlled
- equal
- load
- coke
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention discloses an operation method for large dead coke compost in a digestion furnace vat, which comprises the following steps: the upper charging system adopts a material distribution mode for reducing the load of the ore belt, and the load of the ore belt is less than or equal to 7.0 as a reference; the dead coke pile is large, and the central coke quantity is controlled to be 10-15%; controlling the load of the edge ore belt to be 4-4.5; the W value is controlled to be above 0.6 in operation; the full air port supplies air, and the full air port blows uniformly; the coal injection ratio is controlled at 140-150 kg/t; a blast furnace with 4 tapholes adopts a ferroferric taphole circulating tapping mode; adopting stable raw fuel for supporting, strengthening and screening, wherein the ore powder entering the furnace with the grain size less than or equal to 5mm is less than 1.5 percent; regulating the basicity of slag by controlling the silicon content in pig iron to 0.35-0.55% and the sulfur content in pig iron to 0.025-0.4%, and washing the furnace by using slag iron at the temp. of molten iron greater than or equal to 1510 deg.C. The invention can gradually digest the furnace hearth on the basis of realizing stable production and low consumption of the blast furnace.
Description
Technical Field
The invention relates to an operation method in the field of metallurgy, in particular to an operation method for large dead coke compost in a digestion furnace hearth.
Background
With the enlargement of the domestic blast furnace at present, the diameter of the hearth is correspondingly enlarged, and the volume of the domestic blast furnace exceeds 5000m3 at present reaches 8. The diameter of the blast furnace hearth above 5000 grades is generally 14-15m, and the diameter of the blast furnace hearth above 3000 grades in China also exceeds 13 m. The depth of the corresponding tuyere raceway is about 2m generally, so that the area which can not be reached by the air quantity in the furnace hearth often exceeds 10 m. When external equipment faults cause long-term damping down or improper operation, abnormal furnace temperature alkalinity control, frequent pipeline airflow and the like, and abnormal conditions of the blast furnace, dead coke piles in a furnace cylinder are enlarged, the air quantity and the yield of the blast furnace are reduced, the consumption of the coke ratio, the fuel ratio and the like is increased, and huge loss is caused.
The traditional method for treating the large dead coke compost in the hearth gradually washes out iron slag in the dead coke compost in the hearth by generating slag with low melting point, such as: adding a furnace washing agent such as manganese ore, fluorite or soaking furnace slag and the like to the cloth for washing the furnace. However, the process of washing the furnace often brings about abnormal erosion of the carbon bricks in the furnace hearth, which is contrary to the pursuit of long service life of domestic blast furnaces.
Disclosure of Invention
The invention aims to provide an operation method for large dead coke compost in a digestion furnace hearth, which can gradually digest the furnace hearth on the basis of stable yield and low consumption of a blast furnace, simultaneously can avoid abnormal erosion of carbon bricks caused by using a furnace washing agent in the furnace hearth, and prolongs the service life of the blast furnace.
The technical scheme adopted by the invention for solving the technical problems is as follows: an operation method for large dead coke compost in a digestion furnace hearth comprises the following steps:
(1) the upper charging system adopts a material distribution mode for reducing the load of the ore belt, and reduces the coal gas resistance and the blast furnace pressure difference by taking the ore belt load less than or equal to 7.0 as a reference;
(2) the central air flow is weakened frequently due to the hypertrophy of the dead coke pile, and the central coke amount is not easy to be excessive and is controlled to be 10-15 percent;
(3) the edge should be loose, and the load of the edge ore belt is controlled to be 4-4.5;
(4) the W value is controlled to be more than 0.6 in operation;
(5) the air supply system supplies air through a full air port, and the full air port blows uniformly; the coal injection ratio is controlled at 140-150 kg/t;
(6) the tapping organization is the key, and the blast furnace with 4 tapholes adopts a ferroferric taphole circulating tapping mode to realize uniform, continuous and stable tapping;
(7) adopting stable raw fuel for supporting, and performing reinforced screening, wherein the ore powder entering the furnace with the grain size less than or equal to 5mm is less than 1.5%;
(8) regulating the basicity of slag at 0.35-0.55% of silicon contained in pig iron and 0.025-0.4% of sulfur contained in pig iron, and washing the furnace with slag iron at the temp. greater than or equal to 1510 deg.C.
Further, in the step (6), the key point of control is that the tapping speed is not less than the molten iron production speed; an overlapping tapping mode is adopted, and the sunrise time is controlled to be 1600-1700 min.
The invention has the following beneficial effects: the operation method for large dead coke compost in the digestion furnace hearth can gradually digest the furnace hearth on the basis of stable yield and low consumption of the blast furnace, can avoid abnormal erosion of carbon bricks caused by using a furnace washing agent in the furnace hearth, and prolongs the service life of the blast furnace.
Detailed Description
An operation method for large dead coke compost in a digestion furnace hearth comprises the following steps:
(1) the upper charging system adopts a material distribution mode of reducing ore belt load (the ore belt load is the ratio of ore weight/coke weight arranged on the same angle), and reduces coal gas resistance and blast furnace pressure difference by taking the ore belt load less than or equal to 7.0 as a reference;
(2) the central air flow is weakened frequently due to the hypertrophy of the dead coke pile, and the central coke amount is not easy to be excessive and is controlled to be 10-15 percent;
(3) the edge should be loose, and the load of the edge ore belt is controlled to be 4-4.5;
(4) the upper W value (namely the average value of the temperature of the cross temperature measuring edge/the average value of the top temperature) is controlled to be more than 0.6;
(5) the air supply system supplies air through a full air port, and the full air port blows uniformly; the coal injection ratio is controlled at 140-150 kg/t;
(6) the tapping organization is the key, and the blast furnace with 4 tapholes adopts a ferroferric taphole circulating tapping mode to realize uniform, continuous and stable tapping;
(7) adopting stable raw fuel for supporting, and performing reinforced screening, wherein the ore powder entering the furnace with the grain size less than or equal to 5mm is less than 1.5%;
(8) regulating the basicity of slag at 0.35-0.55% of silicon contained in pig iron and 0.025-0.4% of sulfur contained in pig iron, and washing the furnace with slag iron at the temp. greater than or equal to 1510 deg.C.
In the step (6), the key point of control is that the tapping speed is not less than the molten iron production speed; an overlapping tapping mode is adopted, and the sunrise time is controlled to be 1600-1700 min.
Claims (2)
1. An operation method for large dead coke compost in a digestion furnace vat is characterized by comprising the following steps:
(1) the upper charging system adopts a material distribution mode for reducing the load of the ore belt, and reduces the coal gas resistance and the blast furnace pressure difference by taking the ore belt load less than or equal to 7.0 as a reference;
(2) the central air flow is weakened frequently due to the hypertrophy of the dead coke pile, and the central coke amount is not easy to be excessive and is controlled to be 10-15 percent;
(3) the edge should be loose, and the load of the edge ore belt is controlled to be 4-4.5;
(4) the W value is controlled to be more than 0.6 in operation;
(5) the air supply system supplies air through a full air port, and the full air port blows uniformly; the coal injection ratio is controlled at 140-150 kg/t;
(6) the tapping organization is the key, and the blast furnace with 4 tapholes adopts a ferroferric taphole circulating tapping mode to realize uniform, continuous and stable tapping;
(7) adopting stable raw fuel for supporting, and performing reinforced screening, wherein the ore powder entering the furnace with the grain size less than or equal to 5mm is less than 1.5%;
(8) regulating the basicity of slag at 0.35-0.55% of silicon contained in pig iron and 0.025-0.4% of sulfur contained in pig iron, and washing the furnace with slag iron at the temp. greater than or equal to 1510 deg.C.
2. The method for operating the dead coke compost of the digester hearth according to claim 1, wherein: in the step (6), the key point of control is that the tapping speed is not less than the molten iron production speed; an overlapping tapping mode is adopted, and the sunrise time is controlled to be 1600-1700 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011575305.7A CN112813208A (en) | 2020-12-28 | 2020-12-28 | Operating method for large dead coke compost in digestion furnace hearth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011575305.7A CN112813208A (en) | 2020-12-28 | 2020-12-28 | Operating method for large dead coke compost in digestion furnace hearth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112813208A true CN112813208A (en) | 2021-05-18 |
Family
ID=75854174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011575305.7A Pending CN112813208A (en) | 2020-12-28 | 2020-12-28 | Operating method for large dead coke compost in digestion furnace hearth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112813208A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102373307A (en) * | 2010-08-18 | 2012-03-14 | 王万元 | Novel blast furnace iron making technology with slag iron discharged from center of furnace bottom |
| JP2012107298A (en) * | 2010-11-18 | 2012-06-07 | Kobe Steel Ltd | Device and method for assisting in setting burden distribution at blast furnace top |
| CN102899431A (en) * | 2012-10-23 | 2013-01-30 | 秦皇岛首秦金属材料有限公司 | Method for quantitatively recovering abnormal furnace condition of blast furnace |
| CN107586901A (en) * | 2017-09-25 | 2018-01-16 | 山东泰山钢铁集团有限公司 | One kind prevents the elevated control method of blast furnace cupola well side wall temperatures |
| CN108359760A (en) * | 2017-10-24 | 2018-08-03 | 新疆八钢铁股份有限公司 | Large blast furnace maintains the operating procedure of direct motion using low-heat state strength coke |
| CN109609714A (en) * | 2018-12-04 | 2019-04-12 | 江苏省沙钢钢铁研究院有限公司 | Diagnosis method for large-scale blast furnace core accumulation |
-
2020
- 2020-12-28 CN CN202011575305.7A patent/CN112813208A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102373307A (en) * | 2010-08-18 | 2012-03-14 | 王万元 | Novel blast furnace iron making technology with slag iron discharged from center of furnace bottom |
| JP2012107298A (en) * | 2010-11-18 | 2012-06-07 | Kobe Steel Ltd | Device and method for assisting in setting burden distribution at blast furnace top |
| CN102899431A (en) * | 2012-10-23 | 2013-01-30 | 秦皇岛首秦金属材料有限公司 | Method for quantitatively recovering abnormal furnace condition of blast furnace |
| CN107586901A (en) * | 2017-09-25 | 2018-01-16 | 山东泰山钢铁集团有限公司 | One kind prevents the elevated control method of blast furnace cupola well side wall temperatures |
| CN108359760A (en) * | 2017-10-24 | 2018-08-03 | 新疆八钢铁股份有限公司 | Large blast furnace maintains the operating procedure of direct motion using low-heat state strength coke |
| CN109609714A (en) * | 2018-12-04 | 2019-04-12 | 江苏省沙钢钢铁研究院有限公司 | Diagnosis method for large-scale blast furnace core accumulation |
Non-Patent Citations (4)
| Title |
|---|
| 余琨等: "《高炉喷煤》", 30 April 1995, 东北大学出版社 * |
| 刘云彩: "《现代高炉操作》", 31 May 2016, 冶金工业出版社 * |
| 王万元: "《炼铁实践：高炉操作的思考与感悟》", 30 June 2014, 河北科学技术出版社 * |
| 郑金星: "《炼铁工艺及设备》", 31 January 2011, 冶金工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113774178B (en) | Production system for coupling European smelting furnace and hydrogen-rich carbon circulating blast furnace | |
| CN114457203B (en) | Method for treating furnace hearth aberration of European smelting furnace gasification furnace | |
| CN107419051B (en) | Promote the smelting process of converter scrap melting using gasification dephosphorized slag | |
| CN104531923A (en) | Blast furnace iron-making raw material and blast furnace iron-making method | |
| CN108300831B (en) | Method for improving heat source in smelting process of dephosphorization converter | |
| CN110724784A (en) | Low-silicon high-phosphorus molten iron converter smelting method | |
| CN114717375A (en) | Method for converter-rotating smelting of high-temperature molten iron under slag-remaining and dry-method dedusting conditions | |
| US20240247328A1 (en) | Converter bottom blowing system capable of allowing multiple media to share bottom blowing lances and method for using same | |
| CN103773916A (en) | Method for smelting weather resistant steel through high-phosphorus-content steel discharging by converter | |
| CN112280927A (en) | Operation method for baking scrap steel in converter | |
| CN110305999B (en) | Metallized furnace charge for treating blast furnace hearth accumulation and using method thereof | |
| CN112813208A (en) | Operating method for large dead coke compost in digestion furnace hearth | |
| CN111187873A (en) | Molten steel smelting method of large converter | |
| CN111349797A (en) | Method for extracting vanadium from ultra-low silicon vanadium-titanium molten iron by converter | |
| CN110527786A (en) | The method of converter manganese ore direct alloying technique steel-making | |
| CN110835662B (en) | Furnace stewing material charging method for rapidly recovering furnace condition of blast furnace | |
| CN106319115A (en) | Method for rapidly repairing local damage of blast furnace hearth | |
| CN109082491B (en) | Comprehensive maintenance method for hearth and bottom of blast furnace | |
| CN110423856B (en) | Low-temperature smelting method for dephosphorization and decarburization of low-silicon molten iron | |
| CN108546791B (en) | Method for quickly re-airing vanadium titano-magnetite during blast furnace smelting | |
| CN111575431A (en) | Method for increasing CO content of converter gas | |
| CN112226571A (en) | Method for preparing converter slagging agent by recovering refining slag | |
| CN101255482A (en) | Method for directly melting iron with iron ore powder or iron ore by using converter | |
| CN115537484B (en) | Method for smelting low-grade iron ore concentrate by blast furnace high-coal-ratio injection | |
| CN109811098A (en) | A kind of low silicon smelting method of 1000 cubes of grade blast furnaces |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210518 |
|
| RJ01 | Rejection of invention patent application after publication |