CN114381568A - Method for improving converter tapping quantity - Google Patents
Method for improving converter tapping quantity Download PDFInfo
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- CN114381568A CN114381568A CN202111462474.4A CN202111462474A CN114381568A CN 114381568 A CN114381568 A CN 114381568A CN 202111462474 A CN202111462474 A CN 202111462474A CN 114381568 A CN114381568 A CN 114381568A
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- Prior art keywords
- scrap steel
- converter
- steel
- scrap
- auxiliary material
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 122
- 239000010959 steel Substances 0.000 claims abstract description 122
- 239000000463 material Substances 0.000 claims abstract description 43
- 238000003723 Smelting Methods 0.000 claims abstract description 18
- 238000003860 storage Methods 0.000 claims abstract description 17
- 239000002826 coolant Substances 0.000 claims abstract description 13
- 239000002436 steel type Substances 0.000 claims abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 239000002699 waste material Substances 0.000 abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 229910052742 iron Inorganic materials 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000033764 rhythmic process Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- C21C5/466—Charging device for converters
-
- 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
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
Landscapes
- 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 method for improving the steel tapping quantity of a converter, which comprises the following specific steps: selecting scrap steel: determining the specification and the size of the scrap steel according to the specification and the size of a converter auxiliary material system; according to the specification and size requirements of the scrap steel, determining a proper scrap steel type by combining the condition of scrap steel resources, and selecting corresponding scrap steel; selecting a stock bin: selecting a certain high-level bin of the converter as a special bin for scrap steel; conveying scrap steel: conveying the scrap steel to a converter auxiliary material feeding system, and conveying the scrap steel to a high-level storage bin through the converter auxiliary material feeding system; adding scrap steel: in the normal smelting process of the converter, the waste steel is used as a coolant and added into the converter through an auxiliary material feeding system to be matched for steel smelting.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to a method for improving the steel tapping quantity of a converter.
Background
Compared with the long-flow process for producing steel by using ores and coking coals, the short-flow process for producing steel by using the steel scrap can greatly save energy and water, reduce the discharge of waste gas, waste water and waste residues, save the comprehensive energy consumption by 60 percent when one ton of steel scrap is used, reduce the discharge of the waste gas such as CO, CO2, SO2 and the like by 86 percent, reduce the generation amount of 72 percent of the waste residues and reduce the discharge of 1.6 tons of carbon dioxide;
the steel scrap resource is used as a high-quality steel-making metal raw material, the comprehensive benefit of increasing the steel scrap ratio in converter steel making is remarkable, the production efficiency and the steel yield of a converter steel plant can be remarkably improved by reducing the molten iron consumption and improving the steel scrap ratio, and domestic steel plants generally study methods and processes for improving the steel scrap ratio of the converter in order to adapt to market changes;
the existing converter adds the steel scrap process mainly adopts converter tilting, the steel scrap bucket adds the steel scrap into the converter directly with the overhead traveling crane, or through adding the steel scrap into apparatuses such as the ladle, etc., although the method is more, but all add before the converter smelting begins, at first, because the change of converter heat balance is considered, usually control the upper limit of the steel scrap loading proportion, in order to guarantee the need of quality heat balance, add the coolant made of material containing iron in the smelting process, carry on the adjustment of heat balance, because the coolant that the converter smelting is commonly used is the material with lower yield, strong heat absorption capacity such as mud ball, return mine, iron ore, etc., cause its yield, add the quantity to be smaller than the steel scrap, influence the improvement of the converter steel output; secondly, because the capacity of the scrap hopper is limited, the maximum loading amount of the scrap is limited, the loading amount of the scrap at a certain furnace is insufficient, and in order to meet the requirement of the scrap at a single furnace, the loading hopper of the scrap hopper is overfilled and is limited by the diameter of a furnace opening, the furnace opening is easily blocked, the adding time of the scrap is prolonged, or the scrap is added outside the furnace, so that the production rhythm and the efficiency of the converter are influenced, therefore, other scrap adding modes need to be explored, the scrap is adopted to replace a cooling agent with lower yield and stronger heat absorption capacity to be used in the converter, and the scrap ratio of the converter and the steel output of the converter can be obviously improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for improving the steel tapping quantity of a converter.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for improving the converter tapping quantity comprises the following specific steps:
(S1) selecting scrap steel
Determining the specification and the size of the scrap steel according to the specification and the size of a converter auxiliary material system;
according to the specification and size requirements of the scrap steel, determining a proper scrap steel type by combining the condition of scrap steel resources, and selecting corresponding scrap steel;
(S2) selecting storage bin
Selecting a certain high-level bin of the converter as a special bin for scrap steel;
(S3) conveying scrap
Conveying the scrap steel to a converter auxiliary material feeding system, and conveying the scrap steel to a high-level storage bin through the converter auxiliary material feeding system;
(S4) adding scrap steel
In the normal smelting process of the converter, scrap steel is used as a coolant and added into the converter through an auxiliary material feeding system to be matched for steel smelting.
Preferably, the maximum specification size of the scrap steel in the step (S1) is L1, the minimum size of the auxiliary material system feed opening is L2, and L1 is less than L2 × 30%.
Preferably, the specification size of the scrap steel is 20mm-50 mm.
Preferably, the opening mode of the feed opening of the special scrap bin in the step (S2) is a double-opening mode.
Preferably, when scrap steel is used as the coolant in the step (S4), the scrap steel is added before 1min of the end of oxygen-blown smelting.
According to the invention, the scrap steel can be supplemented at any time according to the heat balance change of the converter, the physical heat and the chemical heat of the molten iron are fully utilized, the scrap steel is added to the greatest extent, the heat utilization efficiency of the converter is improved, the steel output is increased, and the emission of steel per ton is reduced;
the converter charging amount can be flexibly adjusted by charging the scrap steel through the overhead bunker, the charging amount and charging accidents of the scrap steel bucket are reduced, the charging efficiency is improved, the production rhythm is accelerated, and the yield is improved;
in conclusion, the method provided by the invention adopts the waste steel with high yield as the temperature regulator in the converter smelting process, carries out secondary adjustment on the adding amount of the waste steel according to the heat balance change of the converter, fully utilizes the physical heat and the chemical heat of the molten iron, adds the waste steel to the greatest extent and improves the steel output of the converter.
Drawings
FIG. 1 is an overall flow block diagram of the present invention;
Detailed Description
The following will further describe a specific embodiment of the method for increasing the steel tapping amount of the converter according to the present invention with reference to fig. 1. The method for increasing the tap-out quantity of a converter according to the present invention is not limited to the description of the following examples.
Example 1:
the embodiment provides a method for improving the tapping amount of a converter, and the method comprises the following specific steps as shown in figure 1:
(S1) selecting scrap steel
Determining the specification and the size of the scrap steel according to the specification and the size of a converter auxiliary material system;
according to the specification and size requirements of the scrap steel, determining a proper scrap steel type by combining the condition of scrap steel resources, and selecting corresponding scrap steel;
(S2) selecting storage bin
Selecting a certain high-level bin of the converter as a special bin for scrap steel;
(S3) conveying scrap
Conveying the scrap steel to a converter auxiliary material feeding system, and conveying the scrap steel to a high-level storage bin through the converter auxiliary material feeding system;
(S4) adding scrap steel
In the normal smelting process of the converter, scrap steel is used as a coolant and added into the converter through an auxiliary material feeding system to be matched for steel smelting.
In the step (S1), the maximum specification size of the scrap steel is L1, the minimum size of a blanking opening of the auxiliary material system is L2, L1 is more than L2 x 30%, and the specification size of the scrap steel is 20mm-50 mm.
And (S2) adopting a double-opening mode for the opening mode of the feed opening of the special scrap steel bin.
When the scrap steel is used as the coolant in the step (S4), the scrap steel is added before the oxygen blowing smelting is finished for 1 min.
In example 1, the specific process flow is as follows:
(1) selecting a crushed material as a raw material type of the converter high-level storage bin for adding the waste steel according to factors such as waste steel resources, material types, impurities, absorption rate, price and actual field operation conditions, wherein the crushed material is formed by crushing various social waste steels meeting the thickness requirement;
(2) adding the crushed material into the converter
In the converter underground bin area, a spare bin is used independently to store a small amount of crushed materials, waste steel is transported to the underground bin through an automobile, a 100mm screen is used to screen out large-size crushed materials, then the crushed materials are conveyed to a converter high-level bin through a belt conveyor, the crushed materials are added into a converter through a feeding system, and the feeding system is used for adding the crushed materials into the converter from the high-level bin through links such as a vibrating feeder, a weighing hopper, a middle gathering hopper, a sealing gate, a chute and the like;
(3) improvement of high-level stock bin feed opening
The method is characterized in that a standby or spare storage bin for adding a solvent (lime, dolomite and the like) in a converter is used for adding broken materials, and because the feed opening of the original storage bin is small, the materials at the lower part of the storage bin bear the pressure of the materials above and are easy to compress and clamp the storage bin, the feed opening of the storage bin is changed into a double-opening type, and the opening degree is increased to be beneficial to adding the broken materials;
controlling the broken materials:
the further requirement on the size of the scrap steel is strict, and the range is narrowed;
other technical requirements such as components, impurities, harmful substances, cleanliness and the like of the crushed materials are required to be executed according to the internal control standard of an enterprise;
the thickness and the granularity of the crushed scrap steel for the high-level storage bin are also the mandatory acceptance standards besides the inspection of the bulk density; the proportion of the coating and the plating layer is less than or equal to 3 percent; bulk density: not less than 1600kg/m3(ii) a The thickness is more than or equal to 2mm or the diameter phi is more than or equal to 4 mm; granularity: 20-50mm, the length of the individual strip-shaped steel scrap is allowed to be larger than 100mm but not larger than 150mm, the proportion of less than 20mm is less than or equal to 10 percent, and the proportion of more than 100mm is less than or equal to 5 percent.
Optimizing the adding time and the adding quantity of the crushed materials:
adding the waste steel and the molten iron into the converter, shaking the converter to blow oxygen, and adding the oxygen, wherein 500-1000kg of the crushed materials are added into each batch of the materials;
or can be added in the blowing process to be used as a coolant;
the adding time and the adding quantity of the crushed materials are flexibly added according to the dosage requirement and the adding rhythm;
the crushed materials can not be added within 1min before the blowing end point, so that the incomplete melting and the non-uniform molten steel temperature are prevented;
when the adding amount is large, the influence of the total mass of the added molten steel is considered, and the condition that the overhead travelling crane exceeds the specified load is avoided;
the broken scrap steel can be brought into a large amount of steel materials, so that the aim of reducing the cost is fulfilled;
example (b):
steel scrap type: crushing scrap steel, and obtaining the yield of about 92%;
smelting steel: general ordinary carbon and low alloy series steel without special requirements;
the original smelting mode is as follows: 160 ton of molten iron, 10 ton of scrap steel and coolant (return mine) are added into a scrap steel bucket
The mode of adding scrap steel into the storage bin: 160 tons of molten iron, 10 tons of scrap steel added into a scrap steel bucket, scrap steel in a storage bin and a small amount of coolant (return ores).
The data of the specific embodiment are shown in the following table 1, scrap steel is added through an overhead bunker, the adding amount is respectively 3.3 tons/furnace, 6.1 tons/furnace and 13.6 tons/furnace, the steel tapping amount is increased by respectively 2.6 tons/furnace, 4.8 tons/furnace and 11.6 tons/furnace, and the steel tapping amount is obviously increased under the condition that the adding amount (the total adding amount of molten iron and scrap steel of a scrap steel bucket) is not changed along with the increase of the adding amount of the crushed materials. Table 2 shows the variation data of the batch application steel tapping amount before and after the implementation of the scrap feeding into the storage bin, and it can be seen that the steel tapping amount is significantly increased.
TABLE 1
TABLE 2 comparison of tapping amounts before and after implementation
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (5)
1. A method for improving the tapping quantity of a converter is characterized by comprising the following steps: the method comprises the following specific steps:
(S1) selecting scrap steel
Determining the specification and the size of the scrap steel according to the specification and the size of a converter auxiliary material system;
according to the specification and size requirements of the scrap steel, determining a proper scrap steel type by combining the condition of scrap steel resources, and selecting corresponding scrap steel;
(S2) selecting storage bin
Selecting a certain high-level bin of the converter as a special bin for scrap steel;
(S3) conveying scrap
Conveying the scrap steel to a converter auxiliary material feeding system, and conveying the scrap steel to a high-level storage bin through the converter auxiliary material feeding system;
(S4) adding scrap steel
In the normal smelting process of the converter, scrap steel is used as a coolant and added into the converter through an auxiliary material feeding system to be matched for steel smelting.
2. The method for increasing the tapping amount of a converter according to claim 1, wherein: the maximum specification size of the scrap steel in the step (S1) is L1, the minimum size of the auxiliary material system blanking port is L2, and L1 is more than L2 and 30%.
3. The method for increasing the tapping amount of a converter according to claim 2, wherein: the specification and the size of the scrap steel are 20mm-50 mm.
4. The method for increasing the tapping amount of a converter according to claim 1, wherein: and (S2) adopting a double-opening mode for the opening of the feed opening of the special scrap steel bin.
5. The method for increasing the tapping amount of a converter according to claim 1, wherein: and (S4) when the scrap steel is used as the coolant in the step (S4), adding the scrap steel at the moment before the oxygen blowing smelting is finished for 1 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111462474.4A CN114381568A (en) | 2021-12-02 | 2021-12-02 | Method for improving converter tapping quantity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111462474.4A CN114381568A (en) | 2021-12-02 | 2021-12-02 | Method for improving converter tapping quantity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114381568A true CN114381568A (en) | 2022-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111462474.4A Pending CN114381568A (en) | 2021-12-02 | 2021-12-02 | Method for improving converter tapping quantity |
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| Country | Link |
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| CN (1) | CN114381568A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959160A (en) * | 2022-05-16 | 2022-08-30 | 北京科技大学 | Converter steelmaking method and device for dynamically adjusting scrap steel loading based on molten iron conditions |
| CN115820972A (en) * | 2022-11-22 | 2023-03-21 | 山东钢铁股份有限公司 | Method for reducing blowing loss of scrap steel in converter steelmaking process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4010029A (en) * | 1975-11-14 | 1977-03-01 | Energy And Materials Conservation Corporation | Method for increasing the use of scrap and iron oxides by basic oxygen furnace |
| CN108913837A (en) * | 2018-07-30 | 2018-11-30 | 石横特钢集团有限公司 | A kind of high scrap ratio smelting process of converter |
| CN109852760A (en) * | 2018-12-03 | 2019-06-07 | 江苏省沙钢钢铁研究院有限公司 | A kind of converter preheating scrap improves the smelting process of scrap ratio |
| CN111154943A (en) * | 2019-12-26 | 2020-05-15 | 河钢股份有限公司承德分公司 | Method for improving steel scrap ratio in long-flow steelmaking |
| CN111549196A (en) * | 2019-02-10 | 2020-08-18 | 新疆八一钢铁股份有限公司 | Steelmaking operation method for replacing coolant with scrap steel broken material |
| CN112646944A (en) * | 2020-12-02 | 2021-04-13 | 扬州圣莱特冶金科技有限公司 | Converter less-slag smelting method |
| CN112899431A (en) * | 2021-01-15 | 2021-06-04 | 中冶赛迪工程技术股份有限公司 | Production process for improving converter scrap ratio |
-
2021
- 2021-12-02 CN CN202111462474.4A patent/CN114381568A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4010029A (en) * | 1975-11-14 | 1977-03-01 | Energy And Materials Conservation Corporation | Method for increasing the use of scrap and iron oxides by basic oxygen furnace |
| CN108913837A (en) * | 2018-07-30 | 2018-11-30 | 石横特钢集团有限公司 | A kind of high scrap ratio smelting process of converter |
| CN109852760A (en) * | 2018-12-03 | 2019-06-07 | 江苏省沙钢钢铁研究院有限公司 | A kind of converter preheating scrap improves the smelting process of scrap ratio |
| CN111549196A (en) * | 2019-02-10 | 2020-08-18 | 新疆八一钢铁股份有限公司 | Steelmaking operation method for replacing coolant with scrap steel broken material |
| CN111154943A (en) * | 2019-12-26 | 2020-05-15 | 河钢股份有限公司承德分公司 | Method for improving steel scrap ratio in long-flow steelmaking |
| CN112646944A (en) * | 2020-12-02 | 2021-04-13 | 扬州圣莱特冶金科技有限公司 | Converter less-slag smelting method |
| CN112899431A (en) * | 2021-01-15 | 2021-06-04 | 中冶赛迪工程技术股份有限公司 | Production process for improving converter scrap ratio |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959160A (en) * | 2022-05-16 | 2022-08-30 | 北京科技大学 | Converter steelmaking method and device for dynamically adjusting scrap steel loading based on molten iron conditions |
| CN115820972A (en) * | 2022-11-22 | 2023-03-21 | 山东钢铁股份有限公司 | Method for reducing blowing loss of scrap steel in converter steelmaking process |
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