CN109593902B - Blast furnace top big and small tank mixed material distribution system and method - Google Patents
Blast furnace top big and small tank mixed material distribution system and method Download PDFInfo
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- CN109593902B CN109593902B CN201811464885.5A CN201811464885A CN109593902B CN 109593902 B CN109593902 B CN 109593902B CN 201811464885 A CN201811464885 A CN 201811464885A CN 109593902 B CN109593902 B CN 109593902B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/18—Bell-and-hopper arrangements
- C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
Abstract
The invention provides a blast furnace top big and small tank mixed distribution system and a method, wherein the blast furnace top big and small tank mixed distribution system comprises two big tanks, two small tanks, a turning plate chute and a central throat pipe, the two big tanks are symmetrically arranged in parallel, the two small tanks are arranged in series up and down and are positioned on the symmetrical surfaces of the two big tanks, and the volume of each small tank is 20-25% of that of each big tank. The turnover plate chute is arranged above the upper small tank and the two large tanks, can rotate horizontally and turn over in the vertical direction; the central throat is arranged below the lower small tank and the two large tanks. 4 material tanks have independent voltage-sharing system and diffuse system separately, combine specific technology demand, arrange in a flexible way, set for the cloth chronogenesis, can solve the hierarchical branch matter of above-mentioned raw fuel and pack the problem of blast furnace into, and this system belongs to metallurgical equipment research and modified technical field.
Description
Technical Field
The invention belongs to the technical field of research and improvement of metallurgical equipment, and relates to a mixed material distribution system and method for large and small tanks on the top of a blast furnace.
Background
Along with the continuous exploitation of coal resources and iron ore resources, the raw fuel for blast furnace iron making changes continuously, and indexes such as particle size and strength of coke and sinter fluctuate, which has great negative influence on the stable production of the blast furnace. Different parts (especially radial) of the blast furnace have different requirements on the raw fuel, and the air permeability also has larger difference. In order to control the distribution of high-quality and low-quality raw fuel in the blast furnace, the raw fuel must be loaded according to different grades during material distribution. Most of the existing blast furnaces adopt a furnace top and tank distribution system, and the inlet and the outlet of a charging tank are close to one side of the center line of the blast furnace, so that the material flow track collides with the side wall of the charging tank in the charging process of raw fuel, thereby generating obvious phenomena of natural mixing, natural segregation and the like, and the raw fuel can not be flexibly fed into the furnace according to the production requirement in a grading and quality-dividing manner. And a part of blast furnaces adopt a furnace top tank-string distribution system, and the problem that the raw fuel cannot be loaded in a grading and quality-dividing manner is also solved.
Disclosure of Invention
The invention aims to provide a blast furnace top big and small tank mixed distribution system and a method, which can realize the graded and quality-divided charging of blast furnace raw fuel, have good graded and quality-divided effects, shorten the period of equipment transformation and installation, continuously and efficiently perform the graded and quality-divided charging of the raw fuel, improve the charging efficiency of the raw fuel on the whole, and improve the smelting intensity and the yield of molten iron.
In order to achieve the purpose, the invention adopts the technical scheme that:
a mixed distribution system for large and small tanks on the top of a blast furnace comprises two large tanks, namely an east tank and a west tank, two small tanks, namely an upper small tank and a lower small tank, a turnover plate chute and a central throat pipe; the two large tanks are arranged in parallel, the two small tanks are arranged in series in the height direction, and the two small tanks are arranged at the position of the middle vertical line of the central connecting line of the two large tanks; the turnover plate chute is arranged above the upper small tank and the two large tanks, can rotate horizontally and turn over in the vertical direction; the central throat is arranged below the lower small tank and the two large tanks.
Furthermore, the volume of the two small tanks in the blast furnace top large and small tank mixed material distribution system is the same and is 20-25% of the volume of the large tank, and the included angle between the inclined plane of the inner wall of the two small tanks and the horizontal direction is 50-60 degrees.
Furthermore, the feed inlet of the upper small tank and the feed inlets of the two large tanks are positioned at the same height in the blast furnace top large-small tank mixing and distributing system, the discharge port of the upper small tank is matched with the feed inlet of the lower small tank in position and angle, and the discharge port of the lower small tank is positioned at the same height as the discharge ports of the two large tanks.
Further, the diameter of a discharge hole of a central throat pipe in the blast furnace top large and small tank mixed material distribution system is 1-1.2 times of that of a discharge hole of a large tank.
Furthermore, the central throat pipe in the blast furnace top large and small tank mixing and distributing system is funnel-shaped, and the upper structure of the funnel can externally cover the discharge port range of the two large tanks and the discharge port range of the lower small tank.
Furthermore, two turning positions of a turning plate chute in the blast furnace top large and small tank mixing and distributing system correspond to the two large tanks, and the other turning position corresponds to the upper small tank.
Furthermore, a turning plate chute in the blast furnace top large and small tank mixing and distributing system rotates within 360 degrees in the horizontal direction according to the position of a charging tank feeding hole for charging; and turning the material tank at 0-50 degrees in the vertical direction according to the angle of the material tank opening.
Further, in the blast furnace top large tank and small tank mixed distribution system, the large tank and the small tank are respectively provided with a pressure equalizing system and a bleeding system.
The material distribution method adopting the blast furnace top big and small tank mixed material distribution system comprises the following steps:
(1) determining the specific requirements of the raw fuel for graded and quality-divided charging and the corresponding distribution matrix according to the actual condition of the raw fuel and the requirement of furnace condition adjustment;
(2) the east tank is released, the turning plate chute is horizontally rotated to the position above the feed inlet of the east tank, the turning plate chute is tilted to the feed inlet of the east tank, and then the material of grade a is loaded into the east tank through the feeding system and the turning plate chute;
(3) after the loading is finished, the upper small tank is diffused, the turnover plate chute is horizontally rotated to the position above the feeding hole of the upper small tank, the turnover plate chute is tilted to the feeding hole of the upper small tank, and then the material of grade b is loaded into the upper small tank through the feeding system and the turnover plate chute;
(4) carrying out pressure equalization on the Dong tank, opening a Dong tank material flow valve after the pressure equalization is finished, discharging the material of grade a into a central throat pipe, and performing material distribution matrix loading into a blast furnace;
(5) while the pressure of the east tank is equalized and the material is distributed to the blast furnace, the lower small tank is diffused and the material of grade b is discharged into the lower small tank; after the discharge of the Dong tank is finished, carrying out pressure equalization on the lower small tank, and loading the material of the b grade into the corresponding area of the blast furnace according to the corresponding distribution matrix;
(6) synchronously, diffusing the western cans, horizontally rotating the turnover plate chute above a feed inlet of the western cans, tilting the turnover plate chute to the feed inlet of the western cans, and then loading other types of materials into the western cans through a feeding system and the turnover plate chute; after the grade b materials in the east tank are loaded into the blast furnace, equalizing the pressure of the west tank, opening a material flow valve of the west tank, and loading other materials in the west tank into the blast furnace;
(7) and (5) repeating the steps (2) to (6) to form the cyclic operation of charging the raw fuel into the blast furnace.
Compared with the prior cloth technology, the invention has the beneficial effects that:
(1) the different raw fuels can be fed into the furnace according to grades and qualities, such as the common coke and the high-quality coke are fed into the furnace separately, and the small ore and the common ore are fed into the furnace separately;
(2) the method has the advantages of small modification amount of the existing equipment, short modification period and investment saving;
(3) the raw fuel can be fed into the blast furnace continuously and efficiently in a grading and quality-dividing manner, so that the adaptability of blast furnace iron making to the quality fluctuation of the raw fuel is stronger, and if the supply condition and production of the raw fuel fluctuate, the proportion and the loading sequence of the raw fuel with different grades and different qualities can be flexibly adjusted, so that the blast furnace can be kept stable and smooth for a long time in response to the change of the external environment, the damping down is reduced, the fuel consumption is reduced, and the iron making cost is reduced;
(4) the overall efficiency of the feeding system is improved, and the molten iron yield in unit time is improved.
Drawings
FIG. 1 is an assembly structure front view of a blast furnace top big and small tank mixing and distributing system of the present invention, wherein, an east tank 1-1 (thick solid line), a west tank 1-2 (thick solid line), an upper small tank 1-3 (thin solid line), a lower small tank 1-4 (thin solid line), a central throat 1-5, and a flap chute 1-6;
FIG. 2 is a top view of the horizontal rotation position of the flap chute, 2-1 is the turning position of the east tank, 2-2 is the rotation position of the west tank, and 2-3 is the rotation position of the upper small tank;
FIG. 3 is a block diagram of a funnel-shaped central throat, wherein 3-1 is a front view of the central throat and 3-2 is a top view of the central throat.
Detailed Description
The invention is further illustrated by the following specific embodiments in conjunction with the accompanying drawings:
in order to achieve the purpose, the invention adopts the technical scheme that:
a mixed material distribution system for large and small tanks on the top of a blast furnace comprises two large tanks, namely an east tank and a west tank, two small tanks, namely an upper small tank and a lower small tank, a turnover plate chute and a central throat pipe.
The two large tanks are arranged in parallel, the two small tanks are arranged in series in the height direction and are generally parallel to the large tanks, the small tank rotating shafts are arranged on the symmetrical surfaces of the two large tanks and move outwards properly, and the moving distance is about 1-1.5 times of the maximum cross section diameter of each small tank. The volume of the two small tanks is the same and is 20-25% of the volume of the large tank, the included angle between the inclined planes of the inner walls of the two small tanks and the horizontal direction is 50-60 degrees, the feed inlet of the upper small tank and the feed inlets of the two large tanks are positioned at the same height, the discharge outlet of the upper small tank is matched with the feed inlet of the lower small tank in position and angle, and the discharge outlet of the lower small tank and the discharge outlets of the two large tanks are positioned at the same height. The big tank and the small tank are respectively provided with a pressure equalizing system and a diffusing system.
The turnover plate chute is arranged above the upper small tank and the two large tanks, can rotate horizontally and can turn over in the vertical direction. Two overturning positions of the turnover plate chute correspond to the two big tanks, and the other overturning position corresponds to the upper small tank. The turnover plate chute rotates within 360 degrees in the horizontal direction according to the position of a charging bucket feeding hole for charging; and turning the material tank at 0-50 degrees in the vertical direction according to the angle of the material tank opening.
The central throat pipe is arranged below the lower small tank and the two large tanks, the diameter of a discharge hole of the central throat pipe is 1-1.2 times that of a discharge hole of the large tanks, the central throat pipe is funnel-shaped, and the upper structure of the funnel can externally wrap the discharge hole ranges of the two large tank discharge holes and the lower small tank.
The material distribution method adopting the blast furnace top big and small tank mixed material distribution system comprises the following steps:
(1) determining the specific requirements of the raw fuel for graded and quality-divided charging and the corresponding distribution matrix according to the actual condition of the raw fuel and the requirement of furnace condition adjustment;
(2) the east tank is released, the turning plate chute is horizontally rotated to the position above the feed inlet of the east tank, the turning plate chute is tilted to the feed inlet of the east tank, and then the material of grade a is loaded into the east tank through the feeding system and the turning plate chute;
(3) after the loading is finished, the upper small tank is diffused, the turnover plate chute is horizontally rotated to the position above the feeding hole of the upper small tank, the turnover plate chute is tilted to the feeding hole of the upper small tank, and then the material of grade b is loaded into the upper small tank through the feeding system and the turnover plate chute;
(4) carrying out pressure equalization on the Dong tank, opening a Dong tank material flow valve after the pressure equalization is finished, discharging the material of grade a into a central throat pipe, and performing material distribution matrix loading into a blast furnace;
(5) while the pressure of the east tank is equalized and the material is distributed to the blast furnace, the lower small tank is diffused and the material of grade b is discharged into the lower small tank; after the discharge of the Dong tank is finished, carrying out pressure equalization on the lower small tank, and loading the material of the b grade into the corresponding area of the blast furnace according to the corresponding distribution matrix;
(6) synchronously, diffusing the western cans, horizontally rotating the turnover plate chute above a feed inlet of the western cans, tilting the turnover plate chute to the feed inlet of the western cans, and then loading other types of materials into the western cans through a feeding system and the turnover plate chute; after the grade b materials in the east tank are loaded into the blast furnace, equalizing the pressure of the west tank, opening a material flow valve of the west tank, and loading other materials in the west tank into the blast furnace;
(7) and (5) repeating the steps (2) to (6) to form the cyclic operation of charging the raw fuel into the blast furnace.
After the material distribution is finished, the material of the b grade enters the central area of the blast furnace; the material of the grade a is distributed in the peripheral area except the central area. And other kinds of materials are arranged in layers with the class a materials. The b-grade materials of each batch are communicated from top to bottom in the central area of the blast furnace, so that the central airflow of the blast furnace, the skeleton action of dead material columns and good air and liquid permeability of a material layer are ensured, the fluctuation of external raw fuel conditions is favorably resisted, and the stability of the furnace condition is improved. Before improvement, the b-grade materials which are gathered and are communicated with the upper layer and the lower layer do not exist in the center of the blast furnace, the central airflow is unstable, the skeleton action of a dead material column is weak, the permeability and the liquid permeability of a material layer are poor, and further the stability of the furnace condition is poor.
Claims (9)
1. A mixed distribution system of large and small tanks on the top of a blast furnace is characterized in that the distribution system comprises two large tanks, namely an east tank and a west tank, two small tanks, namely an upper small tank and a lower small tank, a turnover plate chute and a central throat pipe; the two large tanks are arranged in parallel, the two small tanks are arranged in series in the height direction and are generally parallel to the large tanks, the rotating shafts of the small tanks are on the symmetrical surfaces of the two large tanks and move outwards properly, and the moving distance is 1-1.5 times of the maximum cross section diameter of the small tanks; the turnover plate chute is arranged above the upper small tank and the two large tanks, can rotate horizontally and turn over in the vertical direction; the central throat is arranged below the lower small tank and the two large tanks.
2. The blast furnace top large and small tank mixing and distributing system as claimed in claim 1, wherein the two small tanks have the same volume which is 20-25% of the volume of the large tank, and the included angle between the inclined plane of the inner wall of the two small tanks and the horizontal direction is 50-60 degrees.
3. The blast furnace top big and small tank mixing and distributing system as claimed in claim 1 or 2, wherein the feed inlet of the upper small tank and the feed inlets of the two big tanks are located at the same height, the discharge outlet of the upper small tank is matched with the feed inlet of the lower small tank in position and angle, and the discharge outlet of the lower small tank is located at the same height as the discharge outlets of the two big tanks.
4. The blast furnace top large and small tank mixing and distributing system as claimed in claim 1, wherein the diameter of the discharge hole of the central throat is 1-1.2 times of that of the discharge hole of the large tank.
5. The blast furnace top big and small tank mixing and distributing system as claimed in claim 1 or 4, wherein the central throat is funnel-shaped, and the upper structure of the funnel can surround the range of the two big tank outlets and the lower small tank outlet.
6. The blast furnace top large and small tank mixing and distributing system as claimed in claim 1, wherein two turning positions of the flap chute correspond to two large tanks, and the other turning position corresponds to an upper small tank.
7. The blast furnace top big and small tank mixing and distributing system according to claim 1 or 6, wherein the flap chute rotates within 360 degrees in the horizontal direction according to the position of the charging bucket feeding port; and turning the material tank at 0-50 degrees in the vertical direction according to the angle of the material tank opening.
8. The blast furnace top large and small tank mixing and distributing system according to claim 1, wherein the large tank and the small tank are respectively provided with a pressure equalizing system and a bleeding system.
9. The blast furnace top size tank mixing and distributing method using the blast furnace top size tank mixing and distributing system as claimed in claim 1 is characterized by comprising the following steps of:
(1) determining the specific requirements of the raw fuel for graded and quality-divided charging and the corresponding distribution matrix according to the actual condition of the raw fuel and the requirement of furnace condition adjustment;
(2) the east tank is released, the turning plate chute is horizontally rotated to the position above the feed inlet of the east tank, the turning plate chute is tilted to the feed inlet of the east tank, and then the material of grade a is loaded into the east tank through the feeding system and the turning plate chute;
(3) after the loading is finished, the upper small tank is diffused, the turnover plate chute is horizontally rotated to the position above the feeding hole of the upper small tank, the turnover plate chute is tilted to the feeding hole of the upper small tank, and then the material of grade b is loaded into the upper small tank through the feeding system and the turnover plate chute;
(4) carrying out pressure equalization on the Dong tank, opening a Dong tank material flow valve after the pressure equalization is finished, discharging the material of grade a into a central throat pipe, and performing material distribution matrix loading into a blast furnace;
(5) while the pressure of the east tank is equalized and the material is distributed to the blast furnace, the lower small tank is diffused and the material of grade b is discharged into the lower small tank; after the discharge of the Dong tank is finished, carrying out pressure equalization on the lower small tank, and loading the material of the b grade into the corresponding area of the blast furnace according to the corresponding distribution matrix;
(6) synchronously, diffusing the western cans, horizontally rotating the turnover plate chute above a feed inlet of the western cans, tilting the turnover plate chute to the feed inlet of the western cans, and then loading other types of materials into the western cans through a feeding system and the turnover plate chute; after the grade b materials in the east tank are loaded into the blast furnace, equalizing the pressure of the west tank, opening a material flow valve of the west tank, and loading other materials in the west tank into the blast furnace;
(7) and (5) repeating the steps (2) to (6) to form the cyclic operation of charging the raw fuel into the blast furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811464885.5A CN109593902B (en) | 2018-12-03 | 2018-12-03 | Blast furnace top big and small tank mixed material distribution system and method |
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| CN201811464885.5A CN109593902B (en) | 2018-12-03 | 2018-12-03 | Blast furnace top big and small tank mixed material distribution system and method |
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| CN109593902A CN109593902A (en) | 2019-04-09 |
| CN109593902B true CN109593902B (en) | 2020-11-24 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4143777A (en) * | 1977-10-06 | 1979-03-13 | Zhdanovsky Metallurgichesky Institut | Blast furnace charging device |
| CN2034584U (en) * | 1988-04-01 | 1989-03-22 | 北京钢铁学院 | Blast furnace with appliance for distributing burden |
| CN101709340B (en) * | 2009-10-30 | 2012-05-09 | 宝钢集团新疆八一钢铁有限公司 | Single-bucket serial-bucket charging method applied to bell-free blast furnaces |
| CN102134622B (en) * | 2010-01-26 | 2012-10-10 | 沈阳东方钢铁有限公司 | Bell-less blast furnace distributing device |
| CN102296134A (en) * | 2011-09-09 | 2011-12-28 | 中冶南方工程技术有限公司 | Bell-less top three 3-parallel bunker valve box |
| CN107881272A (en) * | 2017-10-25 | 2018-04-06 | 江苏省沙钢钢铁研究院有限公司 | A kind of method in blast furnace internal classification sub-prime cloth |
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