CN113186363A - Method for inhibiting periodic fluctuation of blast furnace airflow - Google Patents
Method for inhibiting periodic fluctuation of blast furnace airflow Download PDFInfo
- Publication number
- CN113186363A CN113186363A CN202110401509.7A CN202110401509A CN113186363A CN 113186363 A CN113186363 A CN 113186363A CN 202110401509 A CN202110401509 A CN 202110401509A CN 113186363 A CN113186363 A CN 113186363A
- Authority
- CN
- China
- Prior art keywords
- coke
- distribution
- center
- furnace
- ore
- 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.)
- Withdrawn
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 relates to a method for inhibiting periodic fluctuation of blast furnace airflow, which comprises the following steps of 1) ensuring an airflow central channel, developing central airflow: periodic central coking; meanwhile, the material is distributed by adopting a furnace top material distribution chute in a reciprocating and continuous manner, when the ore is distributed, the chute waits at the original position, when the coke is turned over, the chute returns to the material distribution angle of the coke center along the trend, and at the moment, the coke is distributed from the center to the outer ring, so that the ore is prevented from entering the center of the blast furnace; after the coke is distributed, the chute waits for the distribution of the next batch of ores at the outermost ring, and the distribution is repeated in the same week and circulated; 2) stabilizing the edge flow: the equivalent furnace belly angle of the air inlet three-fork opening area is improved by 0.1-0.8 degrees. 3) Stabilize the furnace throat charge level degree of depth, reduce the disturbance of charge level to the air current: after distribution, the material levels of the ore, the coke and the central large dry coke tend to be flat. The invention keeps the stability of the airflow in the sides and activates the hearth.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to a method for inhibiting periodic fluctuation of blast furnace airflow.
Background
In the production process of the blast furnace, because of poor furnace hearth activity, slight accumulation of the furnace hearth or mismatching of upper and lower regulators, the airflow is easy to generate periodic fluctuation, the external appearance shows that the temperature difference of a furnace body and the temperature of the furnace body are periodically increased and decreased, the utilization rate of coal gas is periodically increased or decreased, the air quantity and the air pressure are periodically fluctuated in a symmetrical way, the material speed is also periodically converted at high and low speeds, the furnace temperature shows periodic cooling and heating change, the temperature of the furnace top shows periodic high and low positions, and the water pumping of the furnace top shows intermittent water pumping; the material feeding device has the inherent essence that the middle airflow periodically diminishes, so that lever benefit exists in material feeding, namely after the central airflow is blocked, the edge airflow starts to be active, at the moment, a large amount of coal gas flows start to pass through the edge, the utilization rate of the coal gas is reduced, the furnace temperature starts to cool, the air adding is easy to accept, the water temperature difference of the furnace body starts to rise, the edge material feeding is accelerated, the central material feeding speed is relatively reduced, the material feeding lever inclines towards the edge, the edge airflow develops to a certain degree, ores rolling into the center gradually decrease, the airflow central channel starts to recover, at the moment, the air volume further increases, the central material feeding speed starts to be accelerated, the material feeding lever inclines towards the center, the material feeding is accelerated along with the development of the central airflow, the ores start to roll into the center, after the certain degree, the central airflow is blocked, the utilization rate of the coal gas starts to rise, the furnace temperature starts to heat, the edge airflow starts to be active, and the cycle is repeated, the periodic air flow fluctuation phenomenon is formed, if the phenomenon can not be inhibited in a short time, the activity of the hearth is further reduced, the obvious hearth accumulation phenomenon occurs in the blast furnace, the treatment is very difficult, and the loss caused by the phenomenon can not be estimated.
The invention provides a method for inhibiting the periodic fluctuation of air flow by adopting methods of periodic center coking, reciprocating and coherent distribution of a distribution chute at the top of a furnace, shortening the length of an air inlet three-fork air port and the like for the first time, keeps the stability of the air flow in the edge, increases the air quantity, activates a furnace cylinder and has important significance for the recovery of the stability and the smoothness of a blast furnace.
Disclosure of Invention
The invention aims to provide a method for inhibiting the periodic fluctuation of blast furnace airflow, which keeps the stability of the airflow in the edge, increases the air volume and activates a furnace hearth.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for inhibiting the periodic fluctuation of blast furnace airflow comprises the following modes:
1) guarantee air current central passage, development central air current: adding a batch of large dry coke in each feeding period of the ore coke and independently distributing the large dry coke into the center of the blast furnace, wherein a batch of coke is independently distributed into the center of the blast furnace in each feeding period to form periodic center coke feeding; meanwhile, the material is distributed by adopting a furnace top material distribution chute in a reciprocating and continuous manner, when the ore is distributed, the chute waits at the original position, when the coke is turned over, the chute returns to the material distribution angle of the coke center along the trend, and at the moment, the coke is distributed from the center to the outer ring, so that the ore is prevented from entering the center of the blast furnace; after the coke is distributed, the chute waits for the distribution of the next batch of ores at the outermost ring, and the distribution is repeated in the same week and circulated;
2) stabilizing the edge flow: the equivalent furnace belly angle of the air inlet three-fork opening area is improved by 0.1-0.8 degrees, the edge airflow is stabilized, and the blast volume is increased.
3) Stabilize the furnace throat charge level degree of depth, reduce the disturbance of charge level to the air current: control ore distribution stockline L2Greater than coke distribution line L1Center large coke dry distribution line L3After distribution, the material level of the ore, coke and central large dry coke tends to be flat.
The average particle size of the bulk dry coke in the step 1) is 50-52mm, and the batch weight of the bulk dry coke is 30-60% of the batch weight of each batch of coke in the original period.
And 3) the equivalent furnace belly angle is the included angle between the circle center of the section of the tuyere outlet in the blast furnace and the connecting line of the upper edge of the furnace belly and the horizontal plane.
Compared with the prior art, the invention has the beneficial effects that:
the method adopts the periodic central coking, the furnace top distribution chute is used for distributing the material in a reciprocating and continuous manner, the length of the air inlet three-fork opening is shortened, the effect of inhibiting the periodic fluctuation of the airflow can be well achieved, the stability of the airflow in the middle is kept, the air quantity is increased, the furnace hearth is activated, and the method has important significance for the recovery of the stability and the smoothness of the blast furnace.
Detailed Description
The invention is further illustrated by the following examples:
the following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.
The method for inhibiting the periodic airflow fluctuation of the blast furnace comprises the following steps: the method comprises the following steps:
1) and (3) adopting periodic central coke feeding to adjust a charging system, wherein the total number of ore coke batches in each original charging period is N, adding a batch of large dry coke in the original charging period, placing the large dry coke in the last batch position in the period, and independently distributing the large dry coke into the center of the blast furnace, wherein the average particle size of the large dry coke is 50-52 mm. The total batch number of the ore coke in a new period is changed into N +1, and the added large dry coke batch is 30-60% of the coke amount of each batch of the N batches of the ore coke, so that a single batch of coke is distributed in the center of the blast furnace in each period to form periodic central coke charging.
In the new feeding period, in the process of distributing the N +1 batches of ore coke, a mode of alternately adding the coke and the ore is adopted. The cloth period is shown in table 1;
table 1:
the burden distribution system at the top of the blast furnace is shown in the table 2;
table 2:
2) the length of the tuyere below the air inlet three-fork opening is shortened so as to improve the equivalent furnace hearth angle of 0.1-0.8 degrees in the area to be the included angle between the circle center of the section of the outlet of the tuyere in the blast furnace and the connecting line of the upper edge of the furnace hearth and the horizontal plane, thereby being beneficial to stabilizing the edge airflow and increasing the blast volume.
3) Stabilize the furnace throat charge level degree of depth, reduce the disturbance of charge level to the air current: control ore distribution stockline L2Greater than coke distribution line L1Center large coke dry distribution line L3After distribution, the material level of the ore, coke and central large dry coke tends to be flat. The stockline system is shown in Table 3;
table 3:
the material distributing chute is adopted to continuously and reciprocally distribute the material, and when the material is distributed, the material distributing chute distributes the material from the outermost ring a of the material distribution1The inclination angle is declined to a6Inclination angle, the ore distribution is completed in the process, and the distribution chute is arranged at a6The inclination angle waits for a coke turning instruction, and the chute returns to the coke center for distribution a after the coke turning instruction is reached0Waiting at an inclined angle, firstly distributing coke from a0The inclination angle is distributed until the outermost ring a of the coke1And (4) inclining, after the coke is distributed, waiting for distributing the next batch of ores in the original position, repeating the process in the same week, and circularly distributing the materials. The coke is distributed in advance on the edge of the central ore, so that the accuracy of the central coke amount can be ensured, the effect of preventing the ore from entering the center can be achieved, and unnecessary actions of the distribution chute are reduced.
Examples
The air flow periodic fluctuation phenomenon of a 4000m3 blast furnace of a certain factory is represented as periodic rising and reduction of furnace body water temperature difference, periodic rising or reduction of gas utilization rate, symmetrical periodic fluctuation of air quantity and air pressure, periodic fast and slow conversion of material speed, periodic cooling and heating change of furnace temperature, periodic high and low of furnace top temperature, intermittent water beating of furnace top water beating, 680mm of air port used below a blast furnace air supply three-fork port, 74.945 degrees of equivalent furnace belly angle of the area, and the method for inhibiting the periodic air flow fluctuation comprises the following steps:
1) the method comprises the steps of adopting periodic central coke feeding to adjust a charging system, wherein the total batch number of ore coke in each original charging period is 20 batches, adding a batch of large dry coke in the original charging period, placing the large dry coke in the last batch position in the period, and independently distributing the large dry coke in the blast furnace center, wherein the total batch number of the ore coke in a new period is 20+1, and the batch weight of the added large dry coke is 30% -60% of that of a normal coke batch, so that each period has a single batch of coke distributed in the center to form periodic central coke feeding.
The continuous and reciprocating material distribution of the material distribution chute is adopted, when distributing the material, the material distribution chute is declined to a 30.1-degree inclination angle from a 40.3-degree inclination angle of an outermost ring of the material distribution of the ore, the material distribution chute finishes the material distribution of the ore, the material distribution chute waits for a coke turning instruction at the 30.1-degree inclination angle, the chute returns to a coke center to distribute the material at a 12.0-degree inclination angle after the coke turning instruction reaches, the coke is distributed all the time from the 12.0-degree inclination angle to the 40.3-degree inclination angle of the outermost ring of the coke when distributing the coke, the next batch of material distribution is waited at the original position after the coke distribution, and the material distribution is repeated in the week and circulated. The coke is distributed in advance on the edge of the central ore, so that the accuracy of the central coke amount can be ensured, the effect of preventing the ore from entering the center can be achieved, and unnecessary actions of the distribution chute are reduced.
The number and distribution of ore coke batches in a feeding period of the blast furnace are shown in Table 4;
table 4:
the burden distribution system at the top of the blast furnace is shown in the table 5;
table 5:
2) the length of the tuyere below the air inlet three-fork opening is shortened to 640mm so as to improve the equivalent furnace bosh angle of the area to 75.366 degrees (the equivalent furnace bosh angle is the included angle between the circle center of the outlet section of the tuyere in the blast furnace and the connecting line of the upper edge of the furnace bosh and the horizontal plane), which is beneficial to stabilizing the edge airflow and increasing the blast volume.
3) Stabilize the furnace throat charge level degree of depth, reduce the disturbance of charge level to the air current: control ore distribution stockline L2Greater than coke distribution line L1Center large coke dry distribution line L3After distribution, the material level of the ore, coke and central large dry coke tends to be flat.
The stockline system is shown in Table 6;
table 6:
Claims (3)
1. a method for inhibiting periodic fluctuations in blast furnace gas flow, comprising the steps of:
1) guarantee air current central passage, development central air current: adding a batch of large dry coke in each feeding period of the ore coke and independently distributing the large dry coke into the center of the blast furnace, wherein a batch of coke is independently distributed into the center of the blast furnace in each feeding period to form periodic center coke feeding; meanwhile, the material is distributed by adopting a furnace top material distribution chute in a reciprocating and continuous manner, when the ore is distributed, the chute waits at the original position, when the coke is turned over, the chute returns to the material distribution angle of the coke center along the trend, and at the moment, the coke is distributed from the center to the outer ring, so that the ore is prevented from entering the center of the blast furnace; after the coke is distributed, the chute waits for the distribution of the next batch of ores at the outermost ring, and the distribution is repeated in the same week and circulated;
2) stabilizing the edge flow: the equivalent furnace belly angle of the air inlet three-fork opening area is improved by 0.1-0.8 degrees, the edge airflow is stabilized, and the blast volume is increased.
3) Stabilize the furnace throat charge level degree of depth, reduce the disturbance of charge level to the air current: control ore distribution stockline L2Greater than coke distribution line L1Center large coke dry distribution line L3After distribution, the material level of the ore, coke and central large dry coke tends to be flat.
2. The method for inhibiting the periodic fluctuation of the blast furnace gas flow according to claim 1, wherein the average particle size of the bulk dry coke in the step 1) is 50-52mm, and the batch weight of the bulk dry coke is 30-60% of the weight of each batch of coke in the original period.
3. The method of claim 1, wherein the equivalent furnace hearth angle in step 3) is an angle between a center of a cross section of the tuyere in the blast furnace and a horizontal plane of a connecting line of an upper edge of the furnace hearth and a center of a cross section of the tuyere in the blast furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110401509.7A CN113186363A (en) | 2021-04-14 | 2021-04-14 | Method for inhibiting periodic fluctuation of blast furnace airflow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110401509.7A CN113186363A (en) | 2021-04-14 | 2021-04-14 | Method for inhibiting periodic fluctuation of blast furnace airflow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113186363A true CN113186363A (en) | 2021-07-30 |
Family
ID=76975790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110401509.7A Withdrawn CN113186363A (en) | 2021-04-14 | 2021-04-14 | Method for inhibiting periodic fluctuation of blast furnace airflow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113186363A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0673416A (en) * | 1992-08-27 | 1994-03-15 | Kawasaki Steel Corp | Method for charging coke in bell-less blast furnace |
| CN1596315A (en) * | 2002-08-29 | 2005-03-16 | 杰富意钢铁株式会社 | Raw material charging method for bell-less blast furnace |
| JP2006283161A (en) * | 2005-04-04 | 2006-10-19 | Jfe Steel Kk | Method for charging raw material into blast furnace |
| CN103898258A (en) * | 2014-04-09 | 2014-07-02 | 莱芜钢铁集团有限公司 | Method for burden distribution of blast furnace |
| CN112609029A (en) * | 2020-11-09 | 2021-04-06 | 鞍钢股份有限公司 | Method for smelting medium coke in high-proportion use of large bell-less blast furnace |
-
2021
- 2021-04-14 CN CN202110401509.7A patent/CN113186363A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0673416A (en) * | 1992-08-27 | 1994-03-15 | Kawasaki Steel Corp | Method for charging coke in bell-less blast furnace |
| CN1596315A (en) * | 2002-08-29 | 2005-03-16 | 杰富意钢铁株式会社 | Raw material charging method for bell-less blast furnace |
| JP2006283161A (en) * | 2005-04-04 | 2006-10-19 | Jfe Steel Kk | Method for charging raw material into blast furnace |
| CN103898258A (en) * | 2014-04-09 | 2014-07-02 | 莱芜钢铁集团有限公司 | Method for burden distribution of blast furnace |
| CN112609029A (en) * | 2020-11-09 | 2021-04-06 | 鞍钢股份有限公司 | Method for smelting medium coke in high-proportion use of large bell-less blast furnace |
Non-Patent Citations (4)
| Title |
|---|
| 左海滨等: "炉腹角和炉身角对高炉煤气流分布的影响", 《钢铁》 * |
| 张灵: "鄂钢380m~3高炉设计", 《炼铁》 * |
| 林成城，杜鹤桂，杜钢: "高炉无料钟多环布料参数的确定", 《东北大学学报(自然科学版)》 * |
| 赵国磊 等: "《高炉中心加焦炉料分布机理及布料方式探讨》", 《钢铁》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112609029B (en) | Method for smelting medium coke in high proportion in large bell-less blast furnace | |
| CN101880739A (en) | Bell-less top multi-ring matrix burden distribution central coke charging method of blast furnace | |
| CN107119163A (en) | A kind of Burden distribution method of blast furnace of pelletizing at high proportion | |
| CN102899431A (en) | Method for quantitatively recovering abnormal furnace condition of blast furnace | |
| CN108504800B (en) | Method for distributing blast furnace according to particle size of raw fuel entering furnace | |
| CN108611455A (en) | A kind of blast furnace uses the distributing method of small nut coke | |
| CN108913831A (en) | A kind of pulverized coal injection into blast furna method for determination of amount | |
| CN106011341B (en) | The method that blast furnace process schreyerite carries high-coal ratio | |
| CN107287372B (en) | A kind of method of blast furnace throat radial coke power load distributing | |
| CN101285108B (en) | Process for charging in bell-less top of blast furnace | |
| CN113136464A (en) | Blast furnace damping method with poor hearth activity | |
| CN113186363A (en) | Method for inhibiting periodic fluctuation of blast furnace airflow | |
| CN111172336A (en) | Improved burden distribution method for schreyerite smelting blast furnace | |
| CN114686626A (en) | Method for smelting scrap steel by blowing bituminous coal in large proportion in oxygen-enriched blast furnace | |
| CN114292974B (en) | Method for reducing blast furnace fuel ratio under tamping coke smelting condition | |
| CN110205421B (en) | Furnace charge with low clinker rate and smelting method | |
| CN113416807B (en) | Charging method for improving air permeability in large-scale blast furnace | |
| CN108611456A (en) | A kind of method that top temperature is controlled by blast furnace combining upper and lower under excess oxygen | |
| CN114015826B (en) | Control method for blast furnace top material distribution | |
| CN113652507B (en) | Blast furnace smelting method for directly adding low-grade limonite | |
| PH12015000393B1 (en) | Flash smelting method for laterite-nickel ore | |
| CN108396084A (en) | The computational methods of blast energy in a kind of blast furnace production process | |
| CN111349729B (en) | Blast furnace damping material preparation method, damping method and computer readable storage medium | |
| CN111500806A (en) | Method for improving comprehensive furnace-entering grade by adding waste steel into blast furnace | |
| CN112226559A (en) | Method for central coking cloth |
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 | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210730 |