CN111020082A - Method for online treatment of blast furnace accretion - Google Patents
Method for online treatment of blast furnace accretion Download PDFInfo
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- CN111020082A CN111020082A CN201911200647.8A CN201911200647A CN111020082A CN 111020082 A CN111020082 A CN 111020082A CN 201911200647 A CN201911200647 A CN 201911200647A CN 111020082 A CN111020082 A CN 111020082A
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Abstract
The invention provides a method for processing blast furnace accretion on line, which comprises the steps of dynamically and comprehensively adjusting a normal material distribution matrix, adopting large negative angle difference multi-ring material distribution and large positive angle multi-ring material distribution to convert multi-ring material distribution back and forth until material distribution is finished, repeating multi-furnace smelting after the furnace smelting is finished until accretion in the blast furnace falls off, and recovering normal smelting material distribution. The large negative angle difference multi-ring distribution and the large positive angle multi-ring distribution are alternated back and forth, so that the blast furnace is artificially manufactured to suppress pressure, be difficult to move, collapse materials, suspend materials and seat materials to strengthen and change the distribution of the gas flow in the furnace, the bonding materials of the furnace wall are washed back and forth by utilizing the thermal stress of the gas flow, and the auxiliary means such as large air volume blowing, water pumping and material level lowering are used, so that the expected effect of quickly removing the bonding materials of the upper tumor in the furnace body is achieved. After the binding material of the blast furnace accretion falls off, the furnace wall is smooth and regular, the furnace condition is stable and smooth, and the furnace can be quickly recovered to reach the production standard.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, and relates to a method for treating blast furnace accretion on line.
Background
Due to the limitation of environmental protection, converter sludge, electric furnace dust removal ash and other high zinc dust sludge generated in a steel mill cannot be processed. In order to realize the balance of materials for the blast furnace and reduce the cost, the common practice of steel mills is to digest high-zinc dust such as converter sludge, electric furnace dust removal ash and the like in the sintered and uniformly mixed materials, so that the zinc-containing load of the raw materials entering the blast furnace is greatly increased and seriously exceeds the standard (the zinc load is more than 1.5kg/t, and the national standard requirement is less than or equal to 0.15kg/t), and in addition, the blast furnace operation is not in place and other factors influence, so that the blast furnace wall is easy to form the nodulation. After the blast furnace is nodulated, the furnace shape is irregular, the stability and the smooth running of the furnace condition and the index promotion are influenced if the furnace shape is irregular, and the difficulty and the abnormality of the furnace condition are influenced if the furnace shape is heavy. In the past, the blast furnace is used for damping down and lowering the charge level, but the method has great potential safety hazard, and the blast furnace blasting treatment method is not advocated in the current industry.
Disclosure of Invention
The technical problem to be solved is as follows: in order to solve the technical problems, the invention provides a method for treating blast furnace accretion on line.
The technical scheme is as follows: the invention provides a method for treating blast furnace accretion on line, which comprises the following steps: in the smelting process of the blast furnace, the blast furnace burden distribution is executed according to the setting of the burden distribution matrix, the normal burden distribution matrix of the blast furnace is adjusted, the lower part in the furnace is forced to be blown to the active furnace cylinder by increasing the blast kinetic energy, the coke burden distribution angle is kept unchanged at the upper part in the furnace, then the ore burden distribution angle is adjusted to be lower than the coke burden distribution angle to form a large negative angle difference to carry out multi-ring burden distribution, the large negative angle difference is 3-7 degrees, then the ore burden distribution angle is rapidly adjusted back to the original angle, the coke burden distribution angle is adjusted to be lower than the ore burden distribution angle to form a large positive angle difference to carry out multi-ring burden distribution, the large positive angle difference is 6-8 degrees, multi-ring burden distribution is carried out to the end of burden distribution in turn by the large negative angle difference multi-ring burden distribution and the large positive angle multi-ring burden distribution difference, the next furnace smelting is carried out after the, and repeating the multi-furnace smelting until the tumor in the blast furnace falls off, and recovering the normal smelting distribution matrix.
Further, after the operation of the distribution matrix with the large negative angle difference is finished, the angle of coke distribution in the distribution matrix with the large negative angle difference is reduced by 2-3 degrees next time; after the distribution matrix with the large positive angle difference operates for one time, the angle of ore distribution in the distribution matrix with the large positive angle difference is reduced by 2-3 degrees for the next time.
Further, in the smelting process of each furnace, the average value of all large negative angle differences is 4.5 degrees.
Further, in the smelting process of each furnace, the average value of all large positive angle differences is 7.46 degrees.
Furthermore, the number of the cloth turns of the multi-ring cloth is 2-3.
Furthermore, in the material distribution process, the blast furnace pressure is artificially manufactured by reducing the blast volume by 5-10%.
Has the advantages that: the method is suitable for blast furnaces with furnace wall nodulation and irregular furnace shapes. The method adopts the dynamic comprehensive adjustment of a material distribution matrix, adopts the large negative angle difference multi-ring material distribution and the large positive angle multi-ring material distribution difference to convert the multi-ring material distribution back and forth, artificially manufactures the blast furnace pressure building, difficult running, material collapsing, material suspending and material seating to strengthen and change the distribution of the gas flow in the furnace, utilizes the thermal stress of the gas flow to wash the bonding material of the furnace wall back and forth, and uses the auxiliary means of large air volume blowing, water pumping and material surface lowering and the like, thereby achieving the expected effect of quickly removing the bonding material of the upper tumor in the furnace body. After the binding material of the blast furnace accretion falls off, the furnace wall is smooth and regular, the furnace condition is stable and smooth, and the furnace can be quickly recovered to reach the production standard.
Drawings
FIG. 1 is a sand steel No. 9 blast furnace gray iron ratio change trend chart.
FIG. 2 is a diagram of the nodulation at the upper part of the furnace body of a sand steel No. 9 blast furnace observed from a manhole
FIG. 3 is a view of the nodulation at the upper part of the furnace body of a sand steel No. 9 blast furnace, which is observed from a manhole.
FIG. 4 is a schematic view of a nodulation of a sand steel No. 9 blast furnace.
FIG. 5 is a zinc load change trend chart of a charging raw material of a sand steel No. 9 blast furnace.
FIG. 6 is a smooth and complete view of the upper furnace wall of the damping-down furnace shaft of the sand steel No. 9 blast furnace in 5 months and 21 days.
Detailed Description
Example 1
A method for on-line treatment of blast furnace accretions, the method comprising the steps of: in the smelting process of the blast furnace, the blast furnace burden distribution is executed according to the setting of the burden distribution matrix, the normal burden distribution matrix of the blast furnace is adjusted, the lower part in the furnace is forced to be blown to the active furnace cylinder by increasing the blast kinetic energy, the coke burden distribution angle is kept unchanged at the upper part in the furnace, then the ore burden distribution angle is adjusted to be lower than the coke burden distribution angle to form a large negative angle difference to carry out multi-ring burden distribution, the large negative angle difference is 3-7 degrees, then the ore burden distribution angle is rapidly adjusted back to the original angle, the coke burden distribution angle is adjusted to be lower than the ore burden distribution angle to form a large positive angle difference to carry out multi-ring burden distribution, the large positive angle difference is 6-8 degrees, multi-ring burden distribution is carried out to the end of burden distribution in turn by the large negative angle difference multi-ring burden distribution and the large positive angle multi-ring burden distribution difference, the next furnace smelting is carried out after the, and repeating the multi-furnace smelting until the tumor in the blast furnace falls off, and recovering the normal smelting distribution matrix. After the operation of the distribution matrix with the large negative angle difference is finished, the angle of coke distribution in the distribution matrix with the large negative angle difference is reduced by 2-3 degrees next time; after the distribution matrix with the large positive angle difference operates for one time, the angle of ore distribution in the distribution matrix with the large positive angle difference is reduced by 2-3 degrees for the next time. The number of cloth turns of the multi-ring cloth is preferably 2-3. In the material distribution process, the blast furnace is artificially manufactured by reducing the blast volume by 5-10%.
Example 2
The invention will be described in further detail with reference to the example of rapid treatment of accretions in a sand steel # 9 blast furnace, but the examples should not be construed as limiting the invention.
Overview of the invention 1
The blast furnace of the sand steel No. 9 is opened in 2018 in 1 month of overhaul, and the actual furnace volume of the blast furnace is 670m3The device is provided with 16 air ports, a south iron port and a north iron port, a dry dedusting system and an industrial water open-circuit cooling system. The furnace condition of the No. 9 blast furnace is better in the smooth operation since the blast furnace is started, the abnormality of the furnace condition does not occur, all indexes are forward steadily, but after the blast furnace is nodulated in the 9 th month in 2018, the fuel consumption is increased continuously and all the indexes slide down continuously when the furnace condition is more and more in the smooth operation.
2 blast furnace accretion determination
(1) From table 1, it can be seen that the yield of the 9# blast furnace is gradually increased in 3-8 months in 2018, and the corresponding furnace condition is better. But the furnace condition is stably and obviously reduced after 9 months, the central airflow is unstable after 11 months, and the cross temperature measurement of the furnace throat shows that: the temperature of the edge is 80-100 ℃, the temperature of the center and the secondary center is 110-120 ℃, the temperature of other points is 130-150 ℃, and a typical low-temperature flat peak curve is presented. The camera shooting in the furnace can often see that the pipeline has a stroke, the blanking ruler has poor shape, the deviation ruler is serious, the sliding ruler is more, and the blast furnace has upper-part thick accretion by combining the comprehensive judgment of the temperature difference of furnace throat water and the like.
(2) Although the furnace condition is unstable in 2018 in 9-10 months, the yield is not obvious, as can be seen from table 1, the operation of the furnace hearth of the blast furnace is active all the time, the upper part of the blast furnace is thick, but the air volume is used stably, no atrophy occurs, and no large influence is caused on the strengthening smelting, but as the time goes on, the center dead material column is gradually formed due to the fact that the center air flow is completely inhibited after nodulation, and the center accumulation of the furnace hearth is more and more serious. The aggravation of the circular flow of the molten iron and the uneven distribution of the airflow also cause uneven and unclean tapping of the two iron holes. The yield rapidly slides down after 11 months in 2018, the air quantity cannot be maintained, and two tuyere small sleeves are burned out continuously due to the working difference of the furnace hearth in the period.
(3) As the diameter of the furnace throat becomes smaller after the upper part of the blast furnace is nodulated, the airflow distribution is uneven, the gas flow rate is increased, the airflow of the pipeline in the furnace is more, and the ash iron ratio is increased sharply (see figure 1). The additional loss of Fe and c in the added fly ash also exacerbates the ton of iron consumption.
(4)2 month, 15 days 1: about 40 hours, the sand steel 9# blast furnace main winch medium speed shaft is broken, the blast furnace can not be fed and iron can be discharged, the damping down is finished, the material line is about 8 meters, after a manhole is opened, 4-6 meters below a blast furnace throat steel brick are found, the thickness is 0.5-1.0 meters, the height is 0.8-1.5 meters, the length is from a 2# tuyere to a 6# tuyere, and from a 9# tuyere to a 13# tuyere, and the method is shown in the figures 2, 3 and 4.
The material distribution matrix of the sand steel No. 9 blast furnace 2 months and 17 days before is shown in the table 1.
TABLE 1.2 Sand Steel No. 9 blast furnace burden distribution matrix 17 months before
And 2, 17 days in month to 2, 25 days in month, adopting small-angle edge widening, flushing the furnace wall by utilizing edge airflow to treat the tumor body bonding material of the furnace wall (see table 2), adjusting the stage, wherein the blanking shape of the blast furnace and the airflow distribution are not obviously improved, detecting the hard and firm conditions of the tumor body bonding material, and finding that the substantial effect is difficult to obtain.
Table 22 month 17 day-25 day sand steel 9# blast furnace burden distribution matrix
2, 26 days to 3 days in 2 months, forcibly adding air at the lower part, increasing the blowing kinetic energy to blow the furnace cylinder, adopting multi-ring cloth with large negative angle difference and multi-ring cloth with large positive angle difference to convert the multi-ring cloth to and fro at the upper part (see table 3), artificially manufacturing blast furnace pressure building, difficult running, material collapse, material suspension and material seat, and continuously flushing the upper tumor body adhesive in the furnace body through a local airflow pipeline and coal gas thermal stress, thereby causing the tumor body to fall off.
Sand steel 9# blast furnace burden distribution matrix in 26-3 days of table 32 month
The large negative angle difference material distribution matrix runs for a smelting period, the large positive angle difference material distribution matrix is rapidly switched, developed edge airflow is rapidly inhibited, on one hand, a heated furnace accretion is rapidly cooled and drops through thermal stress, on the other hand, the edge airflow is rapidly inhibited, and therefore the artificially manufactured blast furnace is formed, and the accretion drops. And adding clean coke after material collapse and material setting to prevent the furnace from cooling.
The blast furnace pressure building can reduce the wind (about 5 percent) properly by artificial manufacture, and the blast furnace pressure building can recover quickly after the material is collapsed, thereby ensuring the stability of the wind speed and the kinetic energy.
The technology for rapidly treating the blast furnace accretion is adopted in 2019 in months 2-3, so that accretion of a furnace body falls off, the furnace wall is smooth, regular and intact after the accretion is eliminated, the blanking of the blast furnace is obviously improved, the air flow distribution is gradually reasonable, the pressing tip of the top of the blast furnace is obviously reduced, the furnace condition is stable and smooth, the furnace condition is rapidly improved, and the yield is rapidly recovered to reach the standard. When the 9# blast furnace is observed to stop at 5 months and 21 days and reduce the material level to 8 meters, the accretion and the thickness of the blast furnace are basically eliminated, the furnace condition is better, and the yield and various indexes are comprehensively recovered to be normal (see table 4).
Table 4 statistical table of main technical and economic indicators of sand steel 9# blast furnace in 2018, 3 months-2019, 4 months
Claims (6)
1. A method for on-line processing blast furnace accretions is characterized by comprising the following steps: in the smelting process of the blast furnace, the blast furnace burden distribution is executed according to the setting of a burden distribution matrix, the normal burden distribution of the blast furnace is adjusted, the lower part in the furnace is forced to be blown to the active furnace cylinder by increasing the blast kinetic energy, the coke burden distribution angle is kept unchanged at the upper part in the furnace, then the ore burden distribution angle is adjusted to be lower than the coke burden distribution angle to form a large negative angle difference to carry out multi-ring burden distribution, the large negative angle difference is 4-7 degrees, then the ore burden distribution angle is rapidly adjusted back to the original angle, the coke burden distribution angle is adjusted to be lower than the ore burden distribution angle to form a large positive angle difference to carry out multi-ring burden distribution, the large positive angle difference is 6-8 degrees, multi-ring burden distribution is alternately carried out to the end of burden distribution in turn by the large negative angle difference multi-ring burden distribution and the large positive angle multi-ring burden distribution difference, the next furnace smelting is carried out after, repeating the multi-furnace smelting until the tumor body in the blast furnace falls off, and recovering normal smelting material distribution.
2. The method for on-line treatment of blast furnace accretions according to claim 1, wherein: after the operation of the distribution matrix with the large negative angle difference is finished, the angle of coke distribution in the distribution matrix with the large negative angle difference is reduced by 2-3 degrees next time; after the distribution matrix with the large positive angle difference operates for one time, the angle of ore distribution in the distribution matrix with the large positive angle difference is reduced by 2-3 degrees for the next time.
3. The method for on-line treatment of blast furnace accretions according to claim 1, wherein: in the smelting process of each furnace, the average value of all large negative angle differences is 4.5 degrees.
4. The method for on-line treatment of blast furnace accretions according to claim 1, wherein: in the smelting process of each furnace, the average value of all large positive angle differences is 7.46 degrees.
5. The method for on-line treatment of blast furnace accretions according to claim 1, wherein: the number of the cloth turns of the multi-ring cloth is 2-3.
6. The method for on-line treatment of blast furnace accretions according to claim 1, wherein: in the material distribution process, the blast furnace is artificially manufactured by reducing the blast volume by 5-10%.
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| CN113265498A (en) * | 2021-05-19 | 2021-08-17 | 陕西龙门钢铁有限责任公司 | Blast furnace type management and control method |
| CN113684332A (en) * | 2021-08-11 | 2021-11-23 | 山东钢铁集团日照有限公司 | Method for quickly eliminating blast furnace pipeline stroke |
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| CN113684332A (en) * | 2021-08-11 | 2021-11-23 | 山东钢铁集团日照有限公司 | Method for quickly eliminating blast furnace pipeline stroke |
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Application publication date: 20200417 |