CN113512614B - Method for adjusting distribution segregation of bell-less top of parallel tank type blast furnace - Google Patents
Method for adjusting distribution segregation of bell-less top of parallel tank type blast furnace Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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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
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- C—CHEMISTRY; METALLURGY
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- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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Abstract
The invention discloses a method for adjusting distribution segregation at the bell-less top of a parallel tank type blast furnace, which adjusts the distribution segregation condition in time through different tank pouring measures according to quantitative indexes of the actual production condition, and particularly judges the segregation phenomenon existing in the distribution process according to the combination of stock rod deviation, cross temperature measuring gun center and secondary center temperature deviation, if the segregation phenomenon occurs, the tank pouring treatment is carried out, and compared with the prior method that the distribution device is periodically adjusted to the distribution starting angle, the method can be adjusted in time according to the actual furnace condition.
Description
Technical Field
The invention relates to a blast furnace burden distribution method, in particular to a method for adjusting burden distribution segregation on a bell-less furnace top of a parallel pot type blast furnace.
Background
Blast furnace burden distribution refers to the distribution of furnace burden at the throat of a blast furnace in the blast furnace ironmaking process, the blast furnace burden distribution rule is an important component of the blast furnace smelting process theory, and the control of blast furnace burden distribution is an important means for blast furnace operation. In the process of distributing materials in the blast furnace, segregation is generated after the materials finally reach the charge level due to the influence of the self characteristics of the materials and the structure of the equipment.
With the enlargement of the blast furnace, the diameter of the hearth and the diameter of the throat are correspondingly increased, and the requirements on the operation of the upper part and the lower part of the blast furnace are higher. The distribution of gas flow in the blast furnace is mainly determined by the distribution of furnace burden in the blast furnace, and the distribution of furnace burden in the blast furnace is mainly determined by an upper system, so that the upper regulation is more and more important. In the process of distributing materials on the parallel tank type bell-less furnace top, the furnace burden can deviate to one side when flowing through the central throat, and snake-shaped segregation can be generated after the furnace burden is distributed on a material surface. The influence of the segregation distribution of the furnace burden on the efficient and stable forward running of the blast furnace is not only small but also the distribution of the gas flow. Therefore, the reduction of segregation generated in the material distribution process of the parallel tank type bell-less top is a problem to be solved, especially for the ultra-large blast furnace.
The patent CN201911041211.9 discloses a new material distribution method for alleviating segregation of conventional material distribution, the method firstly determines the initial angle of material distribution in the blast furnace operation, determines the initial angle and periodically adjusts the material distributor clockwise or counterclockwise to the initial angle of material distribution every 24h or 48h after the material distribution is started, and the material distribution direction of the material distributor is reversed in positive and negative rotation every 24 h; in the production process, the opening of a material flow valve of the distributor is adjusted by 1% when the ore batch weight is adjusted by 1 ton, and after the distribution of the normal distribution turns is finished, a turn is added to adopt the 'turn-back angle' distribution. Although the novel material distribution method for relieving the segregation of the conventional material distribution can solve the segregation phenomenon existing in part of the conventional material distribution process, an index for quantitatively pouring the material according to the material deviation condition is not provided for a blast furnace operator, the initial material distribution angle is determined only according to the air flow condition, and then the material is distributed clockwise or anticlockwise at fixed time. Can not be adjusted in time according to the actual furnace condition.
Disclosure of Invention
Aiming at the technical problems, the invention discloses a method for adjusting the distribution segregation of the bell-less top of a parallel tank type blast furnace, which can adjust the distribution segregation condition by reversing the tank in time according to the quantitative index of the actual production condition, can well solve the segregation phenomenon in the conventional distribution process and ensure the smooth operation of the furnace condition.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a method for adjusting the distribution segregation of a bell-less top of a parallel tank type blast furnace comprises the blast furnace, a first charging tank and a second charging tank which are positioned at the upper part of the blast furnace and symmetrically arranged at the left and right sides of the center line of the blast furnace, wherein, at the beginning, ore is arranged in one charging tank, and coke is arranged in the other charging tank;
the material level at the left side in the blast furnace is monitored in real time through the first stock rod, and the material level at the right side in the blast furnace is monitored in real time through the second stock rod;
the method comprises the following steps:
step 1, when the deviation between the two stock lines of the stock rod is within 0.5m, and the deviation delta T between the central temperature and the secondary central temperature in the furnace is measured by a cross temperature measuring gun to be less than 15 ℃, judging that the material distribution is normal, normally operating the blast furnace, and observing a smelting period S1;
and 4, in the smelting period S3, if the deviation of the two stock lines of the stock rod is not changed or even larger for N hours continuously, and N is larger than or equal to 4, returning to the fixed material distribution, directly pouring into a tank, and then continuously observing a smelting period S4.
The central temperature measuring point is the most front end point of one of the cross temperature measuring guns, the distance between the secondary central temperature measuring point and the central temperature measuring point is 90cm, and the most front ends of the other three temperature measuring guns of the cross temperature measuring gun are all secondary central temperature measuring points.
In the smelting period S3, the following operations are observed and carried out:
observing the furnace condition, and when the air quantity fluctuation is 50-120 m3Within the range, the top pressure fluctuation is within the range of 5-15 kPa, the pressure difference fluctuation is within the range of 5-10 kPa, the material line deviation of the two measuring rods is continuously reduced to be within 0.5-1 m within N hours, N is not less than 4, the deviation delta T of the central temperature and the secondary central temperature in the furnace is measured to be not more than 30 ℃ through a cross temperature measuring gun, and then, the reladling is carried out once for every 5 batches, and is changed to once for every 10 batches; if the situation is contrary, go directly to step 4.
In the smelting period S3, the observation time of the furnace condition is 2-4 h.
The first stage tank-pouring treatment also needs to meet any two of the following four conditions:
the first condition is as follows: deviation of each iron notch [ Si ] is more than 0.22;
and a second condition: the physical thermal difference of the molten iron is more than 35 ℃;
and (3) carrying out a third condition: the difference of the iron tapping amount is more than 1000 t;
and a fourth condition: the difference of the slag alkalinity is more than 0.06.
The second stage tank switching treatment also needs to meet any two of the following five conditions:
the first condition is as follows: measuring the deviation delta T between the central temperature and the secondary central temperature in the furnace by a cross temperature measuring gun to be more than 50 ℃;
and a second condition: deviation of each iron notch [ Si ] is more than 0.25;
and (3) carrying out a third condition: the physical thermal phase difference of the molten iron is more than 45 ℃;
and a fourth condition: the difference of the iron yield is more than 1050 t;
and a fifth condition: the difference of the slag alkalinity is more than 0.08.
Has the advantages that:
the method for adjusting the bell-less top distribution segregation of the parallel tank type blast furnace comprises the steps of adjusting the distribution segregation condition in time through different tank pouring measures according to quantitative indexes of actual production conditions, specifically judging the segregation phenomenon existing in the distribution process according to the combination of stock rod deviation, cross temperature measuring gun center and secondary center temperature deviation, and performing tank pouring treatment if the segregation phenomenon occurs.
And secondly, the deviation range of the stock rod and the deviation ranges of the temperature of the center and the secondary center of the cross temperature measuring gun correspond to different ladle pouring frequencies, so that the ladle pouring workload is reduced while the phenomenon of cloth segregation is avoided.
Drawings
FIG. 1 is a flow chart of the method of the present invention for regulating the segregation of bell-less top burden distribution in a parallel retort blast furnace;
FIG. 2 is a schematic view of a cloth construction of the present invention;
FIG. 3 is a schematic illustration of two stock line deviations of the stock line;
FIG. 4 is a schematic view of a temperature measuring point of a cross temperature measuring gun;
wherein, 1 is a first charging bucket; 2 is a second charging bucket; 3 is a central throat; and 4, a chute.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings and the specific embodiments in the specification.
As shown in fig. 1 to 4, a method for adjusting the bell-less top distribution segregation of a parallel pot type blast furnace comprises the following specific steps:
1. blast furnace material deviation judgment:
(1) judging the material bias condition according to the deviation of the stock rod
The blast furnace stock rod is a measuring element for the blast furnace, the material level in the blast furnace is continuously changed along with the proceeding of iron-making production, and the stock rod can monitor the material level in the blast furnace in the iron-making production process. In the normal iron-making production process, due to the reasons of raw materials, airflow, material distribution matrix, blanking and the like, the two trial rods of the ultra-large blast furnace have slight deviation, generally within 0.5 m. And when the deviation of the two measuring rods is more than 0.5m for 4 continuous hours, judging that the material deviation occurs.
(2) Judging the material bias condition according to the temperature of the secondary center
Firstly, judging whether the temperature peak of the cross temperature measuring gun is in the central position, if not, observing which side the temperature peak deflects to, and judging the deflection of furnace burden.
(3) Tapping deviation of different tapholes: the deviation of [ Si ] is more than 0.2, the deviation of molten iron temperature is more than 30 ℃, the deviation of tapping amount is more than 1000t, and the deviation of slag alkalinity is more than 0.05.
2. Partial material solving measures:
(1) taking measures by combining the material bias condition
In the above situation, when the deviation of the two measuring rods is greater than 0.5m for 4 hours continuously or the deviation delta T between the central temperature and the secondary central temperature in the furnace measured by the cross temperature measuring gun is within 15-30 ℃, the material deviation is considered to occur, and the concrete condition of the material deviation is determined by combining the other four conditions.
Specifically, when the stock rod deviation is greater than 0.5m but less than 1m for 4 continuous hours, any two of the following five conditions are satisfied:
the first condition is as follows: the secondary central temperature of the cross temperature measuring gun is higher than the central temperature by more than 30 ℃;
and a second condition: the difference of the [ Si ] of the iron notch is more than 0.22;
and (3) carrying out a third condition: the physical thermal difference of the molten iron is more than 35 ℃;
and a fourth condition: the difference of the iron tapping amount is more than 1000 t;
and a fifth condition: the alkalinity difference is more than 0.06;
taking the measure of pouring the tank once every 10 batches;
when the deviation of the stock rod is larger than 1m for 4 continuous hours, any two of the following five conditions are simultaneously met:
the first condition is as follows: the temperature at the secondary center of the cross temperature measuring gun is higher than the central temperature by more than 50 ℃;
and a second condition: the difference of the [ Si ] of the iron notch is more than 0.25;
and (3) carrying out a third condition: the physical thermal phase difference of the molten iron is more than 45 ℃;
and a fourth condition: the difference of the iron yield is more than 1050 t;
and a fifth condition: the alkalinity difference is more than 0.08;
the tank was emptied once every 5 batches.
(2) Observing the furnace condition after taking measures
After taking the tank-pouring measure, observing the change conditions of the furnace conditions for 2 hours, including air quantity, top pressure, pressure,Differential pressure, two stock lines of the stock rod, and the central temperature and the secondary central temperature of the cross temperature measuring gun. If the batch is turned over once every 5 batches before, the furnace condition is observed, and the fluctuation of the air quantity does not exceed 100m3And when the top pressure fluctuation does not exceed 15kPa, the pressure difference fluctuation does not exceed 10kPa, the deviation of the temperature of the center and the secondary center of the two measuring probes and the cross thermometric gun is reduced to the range of one-time pouring of every 10 batches, the one-time pouring of every 5 batches is changed into the one-time pouring of every 10 batches, and if the situation is opposite to the above, the one-time pouring of every 5 batches is changed into the direct pouring.
(3) Performing the next operation according to the furnace condition recovery condition
Changing the pouring of every 5 batches into every 10 batches if the deviation is reduced according to the observed furnace condition information; if the deviation is not changed or even greater, the tank is directly inverted.
Examples
A blast furnace production line is designed to be put into production, a furnace top charging bucket is adopted as a merging bucket, the requirement of the blast furnace for dumping is met, the charging bucket on one side of the initial blast furnace is ore, and the charging bucket on the other side of the blast furnace is coke.
The production line of the blast furnace is 5800m3One blast furnace has a daily molten iron output of 13200 tons, the deviation of two normal stock lines of the stock rod of the blast furnace is less than 0.5m, and the air quantity is 7900m3Min, oxygen enrichment of 45000m3And/h, top pressure 275 kPa, and pressure difference 170 kPa. In the normal material distribution process, two stock lines of the two stock rods monitor the stockline depth in real time and the central and sub-central temperatures of the cross temperature measuring gun in real time, the stock line of the first stock rod is monitored to be 1.45 m, the stock line of the second stock rod is monitored to be 0.63 m, the deviation of the stock lines of the two stock rods is monitored to be 0.82 m, and at the moment, the central temperature of the cross temperature measuring gun is 148 ℃, the sub-central temperature is 169 ℃, and the iron notch [ Si ] is monitored]Deviation is 0.27, molten iron temperature deviation is 41 ℃, tapping quantity deviation is 1100 t, slag alkalinity deviation is 0.07, and blast furnace operators judge that the material deviation occurs and take a tank dumping measure.
If the deviation of the two stock lines of the two stock probes is within 1m, pouring the stock lines once every 10 batches of the stock materials, and observing a smelting period after pouring the stock lines, wherein the smelting period comprises air volume, top pressure, pressure difference, the two stock lines of the two stock probes, the central temperature and the sub-central temperature of the cross temperature measuring gun and the tapping condition;
if the deviation of the two stock lines of the stock rod continues to increase and the deviation of the central temperature and the secondary central temperature of the cross temperature measuring gun continues to increase, changing the pouring of every 10 batches of materials into the pouring of every 5 batches of materials, and continuously observing a smelting period;
if more serious deviation occurs, the tank is directly inverted.
Claims (5)
1. A method for adjusting the distribution segregation of a bell-less top of a parallel tank type blast furnace comprises the blast furnace, a first charging tank and a second charging tank which are positioned at the upper part of the blast furnace and symmetrically arranged at the left and right sides of the center line of the blast furnace, wherein, at the beginning, ore is arranged in one charging tank, and coke is arranged in the other charging tank;
the material level at the left side in the blast furnace is monitored in real time through the first stock rod, and the material level at the right side in the blast furnace is monitored in real time through the second stock rod;
the method is characterized by comprising the following steps:
step 1, when the deviation between the two stock lines of the stock rod is within 0.5m, and the deviation delta T between the central temperature and the secondary central temperature in the furnace is measured by a cross temperature measuring gun to be less than 15 ℃, judging that the material distribution is normal, normally operating the blast furnace, and observing a smelting period S1;
step 2, in the smelting period S1, when the deviation of the two stock lines of the stock rod is continuously located between 0.5m and 1m for N hours, N is more than or equal to 4, and the deviation delta T of the central temperature and the secondary central temperature in the furnace is measured to be between 15 ℃ and 30 ℃ through a cross temperature measuring gun, judging that the first-stage reladling treatment is needed, specifically: pouring the batch once every 10 times, and observing a smelting period S2;
step 3, in the smelting period S2, if the deviation of the two stock lines of the stock probes continuously exceeds 1m for N hours, N is more than or equal to 4, and the deviation delta T of the central temperature and the secondary central temperature in the furnace measured by the cross temperature measuring gun is more than 30 ℃, performing second-stage reladling treatment, specifically: pouring the batch once every 5 times, and continuously observing a smelting period S3;
step 4, in the smelting period S3, if the deviation of the two stock lines of the stock rod is not changed or even larger for N hours continuously, and N is larger than or equal to 4, returning to the fixed material distribution, directly pouring the stock rod into a tank, and then continuously observing a smelting period S4;
the central temperature measuring point is the most front end point of one of the cross temperature measuring guns, the distance between the secondary central temperature measuring point and the central temperature measuring point is 90cm, and the most front ends of the other three temperature measuring guns of the cross temperature measuring gun are all secondary central temperature measuring points.
2. The method for regulating the bell-less top burden distribution segregation of a parallel pot blast furnace as claimed in claim 1, wherein in said smelt cycle S3, the following operations are observed and carried out:
observing the furnace condition, and when the air quantity fluctuation is 50-120 m3Within the range, the top pressure fluctuation is within the range of 5-15 kPa, the pressure difference fluctuation is within the range of 5-10 kPa, the material line deviation of the two measuring rods is continuously reduced to be within 0.5-1 m within N hours, N is not less than 4, the deviation delta T of the central temperature and the secondary central temperature in the furnace is measured to be not more than 30 ℃ through a cross temperature measuring gun, and then, the reladling is carried out once for every 5 batches, and is changed to once for every 10 batches; if the situation is contrary, go directly to step 4.
3. The method for regulating the bell-less top burden distribution segregation of the parallel pot type blast furnace as claimed in claim 2, wherein the observation time of the furnace condition in the smelting period S3 is 2-4 h.
4. The method of tuning the bell-less top burden distribution segregation of a parallel retort blast furnace as defined in claim 1 wherein said first stage reladling process further satisfies any two of the following four conditions:
the first condition is as follows: deviation of each iron notch [ Si ] is more than 0.22;
and a second condition: the physical thermal difference of the molten iron is more than 35 ℃;
and (3) carrying out a third condition: the difference of the iron tapping amount is more than 1000 t;
and a fourth condition: the difference of the slag alkalinity is more than 0.06.
5. The method for regulating bell-less top burden distribution segregation of a parallel pot blast furnace as claimed in claim 1, wherein said second stage reladling process further satisfies any two of the following five conditions:
the first condition is as follows: measuring the deviation delta T between the central temperature and the secondary central temperature in the furnace by a cross temperature measuring gun to be more than 50 ℃;
and a second condition: deviation of each iron notch [ Si ] is more than 0.25;
and (3) carrying out a third condition: the physical thermal phase difference of the molten iron is more than 45 ℃;
and a fourth condition: the difference of the iron yield is more than 1050 t;
and a fifth condition: the difference of the slag alkalinity is more than 0.08.
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| CN115558730B (en) * | 2022-10-11 | 2023-11-24 | 山东钢铁集团日照有限公司 | Method for treating deviation of blast furnace burden surface |
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