CN103305641A - Method for loading materials by blowing in blast furnace - Google Patents
Method for loading materials by blowing in blast furnace Download PDFInfo
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- CN103305641A CN103305641A CN2013102467428A CN201310246742A CN103305641A CN 103305641 A CN103305641 A CN 103305641A CN 2013102467428 A CN2013102467428 A CN 2013102467428A CN 201310246742 A CN201310246742 A CN 201310246742A CN 103305641 A CN103305641 A CN 103305641A
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- 239000000463 material Substances 0.000 title claims abstract description 153
- 238000000034 method Methods 0.000 title claims abstract description 82
- 238000007664 blowing Methods 0.000 title claims abstract description 19
- 238000011068 loading method Methods 0.000 title abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 63
- 230000008569 process Effects 0.000 claims abstract description 34
- 238000009826 distribution Methods 0.000 claims abstract description 27
- 239000000571 coke Substances 0.000 claims description 116
- 238000004519 manufacturing process Methods 0.000 claims description 38
- 238000005259 measurement Methods 0.000 claims description 27
- 239000004744 fabric Substances 0.000 claims description 18
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 4
- 239000005445 natural material Substances 0.000 abstract description 2
- 239000003245 coal Substances 0.000 abstract 2
- 238000013016 damping Methods 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 9
- 238000010298 pulverizing process Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 241001669679 Eleotris Species 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a method for loading materials by blowing in a blast furnace. The method is characterized by sequentially dividing a blast furnace material loading process into a furnace cylinder and middle-lower furnace body part material loading stage, a material flow trace testing stage and a residual furnace burden loading stage according to the time sequence, wherein in the furnace cylinder and middle-lower furnace body part material loading stage, cold air is blown to the blast furnace; in the material flow trace testing stage, the blast furnace is subjected to damping down to perform a material flow trace test, and materials are distributed by an ore coal clamping distribution method in the material flow trace testing process; and in the residual furnace burden loading stage, air is blown into the blast furnace. According to the method, the materials are loaded on the middle-lower part of a furnace body with wind and are then loaded to a fixed material line, and a material flow trace is tested in a concentrated manner by a laser method; in the material flow trace testing process, the materials are distributed by the ore coal clamping distribution method; after the material flow trace test is finished, the materials are loaded to a ruled material line by a winded material loading method. The method for loading the materials by blowing in the blast furnace is favorable for natural material loading and quick recovery of air volume after blowing-in ignition.
Description
Technical Field
The invention relates to the technical field of blast furnace production, in particular to a blast furnace blow-in charging method.
Background
Whether the blast furnace is opened or not is directly related to whether the blast furnace can successfully reach the rated economic and technical indexes and the service life of a first-generation furnace service within the specified time, and is the comprehensive embodiment of each technology. The charging during the furnace opening is not simple to fill the furnace burden below the blast furnace burden line, more importantly, the ore coke is distributed at the required position according to the reasonable gas flow distribution requirement of the blast furnace, and meanwhile, the amount of powder entering the furnace is reduced as much as possible, so that a smooth gas flow channel is provided after air supply.
Because most of the existing blast furnaces adopt bell-less furnace top equipment, the material flow tracks need to be measured when the blast furnaces are opened, and reference basis is provided for normal production and reasonable material distribution angles. The material flow track test method comprises the following steps: the material flow track is measured by a laser method and the material flow track is measured by a material net rack building method, the material flow track measured by the laser method is not interfered by human factors, the accuracy is higher, and the measuring effect cannot be influenced because a material net is deformed by furnace burden, so that the material flow track is accepted by most manufacturers.
The currently widely adopted blow-in charging method can be divided into the following steps according to whether air is supplied in the charging process: the charging method with air and the charging method without air can blow the powder in the furnace burden out of the furnace through cold air, thereby effectively reducing the powder entering the furnace, and simultaneously, the charging method is influenced by the air blast, and the charging column is relatively loose after the furnace burden is charged. On the contrary, the charging without wind has the disadvantages of poor air permeability of the blast furnace after air supply, difficult air recovery, material suspension after air supply and the like because a large amount of powder is brought in during the charging process, the furnace burden has no wind resistance when falling, the falling speed is high, the falling is serious, and the falling and crushing are serious.
The material flow measuring track by the laser method is started when the material line is deep, and the material flow measuring track is started when the material charging is started. The material flow track measured by the laser method is affected by the fact that the measuring equipment cannot work under the condition of wind, and wind charging cannot be achieved all the time. After each batch of materials is loaded, the definition of a laser image can be guaranteed only after furnace dust is scattered, waiting for 1-5 minutes before distributing is needed, so that the loading process is slow, a large amount of powder is brought into the blast furnace, and the test material is tested from the lower part of the furnace body to the upper part of the furnace body, so that the distribution of an ore coke layer of the originally planned loading is disturbed, the furnace condition after air supply is not smooth, and the difficulty of air volume recovery after the furnace is opened and the air supply is more severe.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a blast furnace blowing-in charging method, which sequentially divides the charging process of a blast furnace into three stages according to the time sequence, namely, a charging process of the middle lower part of a hearth and a furnace body, a material flow track testing process and a charging process of the residual furnace burden. Then different charging modes are adopted in different stages, so that the aims of quickly opening the furnace and smoothly achieving the production are fulfilled.
The purpose of the invention is achieved by the following technical scheme: the blast furnace blowing-in charging method comprises the following steps: the charging process of the blast furnace is sequentially divided into a charging stage at the middle lower part of a furnace hearth and a furnace body, a material flow track testing stage and a residual furnace charge charging stage according to the time sequence. Wherein,
when the blast furnace is in the charging stage of the middle lower part of the furnace hearth and the furnace body, the blast furnace is blown with cold air, the temperature of the cold air is controlled to be less than or equal to 300 ℃, the pressure difference of the blast furnace is controlled to be less than or equal to 0.12MPa, and the air quantity is less than or equal to 50 percent of the normal air quantity of the blast furnace; and for the blow-in of the furnace with the sleeper for filling the furnace hearth, after the sleeper is filled, the blast furnace is blown with cold air.
When the material flow track test stage is in operation, the blast furnace blast is stopped, the material flow track test is carried out at the position where the material line is lower than minus 6 meters and higher than minus 10 meters, and the material is distributed in the process of measuring the material flow track by adopting an ore coke cloth clamping mode.
The ore coke cloth clamping mode cloth distribution comprises the steps of determining the number of required material preparation tanks according to the number of cloth angles to be measured, wherein each angle corresponds to one tank of material; sorting the ore angles to be measured in the descending order, and then grouping, wherein the same group is adjacent angles, the maximum angle difference of each group is less than or equal to 4 degrees, and each group is numbered in the descending order of the angles; ordering the coke angles to be measured in the order from big to small, and then grouping; the coke angle group number is equal to the group number of the ore angles, each group is numbered according to the sequence of the angles from large to small, at least 1 angle in each group of coke angles is smaller than the minimum value of the ore angles corresponding to the same numbered group, at least 1 angle in each group of coke angles is larger than the maximum value of the ore angles corresponding to the group, and if the coke angles are not met, the coke angles are increased; dividing the material flow track test into ore groups for a plurality of cycles, wherein each cycle measurement angle comprises a group of ore measurement angles and a group of coke measurement angles with the same number as the ore groups; numbering the test cycles from small to large according to the included ore angles; measuring material flow tracks of angles included in each cycle from small to large according to the sequence of the measurement cycle numbers; the coke is measured from a large angle to a small angle in the order of the angle measurement in a single circulation, and then the ore is measured from a large angle to a small angle in the order of the angle measurement in the single circulation.
The method further comprises the following steps that the total ore test material quantity used for testing the material flow track = the number of the ore angles required to be measured x the weight of the ore in each tank, and the weight of the ore in each tank meets the following requirements: normal production ore batch weight ÷ normal production ore distribution lap number per batch x 1 < per pot ore weight ÷ normal production ore batch weight per batch x 2.
The method also comprises the following steps that the total coke test material quantity used for testing the material flow track = the number of the coke angles required to be measured x the weight of the coke in each tank, and the weight of the coke in each tank meets the following requirements: the batch weight of normal production coke is divided by the batch weight of normal production coke, the cloth turn number of each batch of normal production coke is multiplied by 1, the weight of each tank of coke is multiplied by the batch weight of normal production coke, and the cloth turn number of each batch of normal production coke is multiplied by 3.
When the method is in the charging stage of the residual furnace burden, the blast furnace is blasted; when the residual furnace charge is in the charging process, if ignition is needed immediately in time to blow, charging is carried out while hot air is selectively blown to the blast furnace; when blast furnace is blasted with hot air, the blast furnace temperature is controlled to be more than or equal to 700 ℃, the blast furnace pressure difference is less than or equal to 0.15MPa, and the air quantity is less than or equal to 50 percent of the normal air quantity of the blast furnace; if ignition and blowing-in are not needed temporarily, charging and blowing cold air to the blast furnace; when blast furnace is blown with cold air, the temperature of the cold air is controlled to be less than or equal to 300 ℃, the pressure difference of the blast furnace is controlled to be less than or equal to 0.15MPa, and the air quantity is less than or equal to 50% of the normal air quantity of the blast furnace.
The method also comprises the step of controlling the opening of the material flow valve in the stage of testing the material flow track according to the normal production and material distribution.
The invention provides a blow-in charging method which has the advantages of both charging with air and measuring material flow tracks by a laser method and can realize natural material movement and quick air volume recovery after blow-in ignition.
Detailed description of the preferred embodiment
The present invention will be described in detail below with reference to exemplary embodiments thereof with reference to the design concept of the present invention.
The design idea of the invention is to provide a blast furnace blow-in charging method which adopts different charging modes for different stages, namely, charging is carried out by adopting wind at the middle lower part of a furnace body; the material flow tracks are centrally measured by a laser method after being arranged on a fixed material line; distributing materials in a manner of clamping the ore coke in the process of measuring the material flow track; and after the material flow track test is finished, the material flow track is continuously sent to a specified material line by adopting the material with wind.
The charging process of the blast furnace is sequentially divided into three stages according to time sequence, wherein the charging stage comprises a charging stage at the middle lower part of a furnace hearth and a charging stage at the middle lower part of a furnace body; when the furnace hearth and the furnace body are in the charging process, blowing cold air into the blast furnace, controlling the temperature of the cold air to be less than or equal to 300 ℃, the pressure difference of the blast furnace to be less than or equal to 0.12MPa and the air quantity to be less than or equal to 50 percent of the normal air quantity of the blast furnace; and for the blow-in of the furnace with the sleeper for filling the furnace hearth, after the sleeper is filled, the blast furnace is blown with cold air.
The first stage has the following functions and advantages: the blast furnace is blasted while charging, so that the falling speed of the furnace burden can be reduced, and the pulverization rate of the furnace burden after falling is reduced; the blast furnace is blown during charging, so that powder in the furnace burden can be brought out of the blast furnace through the blast furnace at the top of the blast furnace, and the amount of powder entering the blast furnace in the charging stage is reduced; the blast furnace is blasted while charging, so that the loosening degree of the material column can be increased when charging is finished, and the material column is prevented from being over-compacted; the blast temperature can be reasonably controlled, and the failure of a charging plan caused by the ignition of coke in the charging process is prevented; the blast volume and the pressure difference can be reasonably controlled, and furnace charge pulverization caused by over-high pressure difference and airflow scouring in the charging process is prevented.
The second stage of the invention is a material flow track testing stage; the material flow track test stage is carried out at a position where the material line is lower than-6 meters and higher than-10 meters, the blast furnace blast is stopped at the moment, and the material flow track is tested and distributed in a mine coke cloth clamping mode; the ore coke cloth clamping mode cloth distribution comprises the steps of determining the number of required material preparation tanks according to the number of required measured cloth angles, sequencing the ore angles to be measured from large to small, grouping, dividing adjacent angles into one group, namely, the adjacent angles in the same group, wherein the maximum angle difference of each group is less than or equal to 4 degrees, and numbering each group according to the sequence of the angles from large to small; ordering the coke angles to be measured in the order from big to small, and then grouping; the coke angle group number is equal to the group number of the ore angles, each group is numbered according to the sequence of the angles from large to small, at least 1 angle in each group of coke angles is smaller than the minimum value of the ore angles corresponding to the same numbered group, at least 1 angle in each group of coke angles is larger than the maximum value of the ore angles corresponding to the group, and if the coke angles are not met, the coke angles are increased; dividing the material flow track test into ore groups for a plurality of cycles, wherein each cycle measurement angle comprises a group of ore measurement angles and a group of coke measurement angles with the same number as the ore groups; numbering the test cycles from small to large according to the included ore angles; then measuring material flow tracks of angles included in each cycle from small to large according to the serial number of the measurement cycles; for each angle measurement sequence in a single circulation, coke is measured from a large angle to a small angle in sequence, and then ore is measured from the large angle to the small angle in sequence.
The ore with smaller angle difference adjacent to the angle is combined into a group of continuous distribution, before each group of ore is distributed, a group of coke is distributed first, each group of coke at least comprises 2 angles, at least one tank coke falling point is positioned at the inner side of an ore falling point area, and at least one tank coke falling point is positioned at the outer side of the ore falling point area. The specific method comprises the following steps:
a when in the material flow track testing stage, the ore angles to be measured are sequenced from large to small, such as alpha1、α2、α3、α4、α5、α6、α7、α8、…、αn. The ore angles to be measured are grouped according to the principle that the total angle difference is less than or equal to 4 degrees, the same group only can contain adjacent angles, and each group is numbered according to the angle from large to small, for example, the ore angles are divided into the following a groups: first group alpha1、α2、α3(wherein α is3-α1Not more than 4 degree; second group alpha4、α5(wherein α is5-α4≤4Degree); …, respectively; group a ofn-i-1、αn-i、…、αn(wherein i is an arbitrary integer of 0 or more, α)n-αn-i-1≤4°）。
And B, when the coke is in the material flow track testing stage, selecting a proper coke distribution angle, wherein at least 1 coke angle is smaller than the minimum ore angle, at least 1 coke angle is larger than the maximum ore angle, and the total coke angle is larger than or equal to 2 times of the total ore group number.
C when in the flow trajectory test stage, ordering the coke angles to be measured in order from large to small, e.g., beta1、β2、β3、β4、β5、β6、β7、β8、…、βm. The coke angles to be measured are grouped, the group number is equal to the group number of the ore angles, each group is numbered according to the angle from large to small, the coke angles in each group are also numbered according to the angle from large to small, at least 1 angle in each group of coke angles is smaller than the minimum value of the ore angles corresponding to the same numbered group, at least 1 angle in each group of coke angles is larger than the maximum value of the ore angles corresponding to the same numbered group, and if the coke angles are not met, the coke angles are increased. For example, coke is classified into the following group a corresponding to the above ore classification method: first group of beta1、β2And beta5、β6(wherein. beta.)2＞α1And β5＜α3) (ii) a …, respectively; group a βp-q、…、βpAnd betam-r、…、βm(wherein q and r are arbitrary integers of 0 or more, p is an arbitrary positive integer, and βp＞αn-i-1And βm-r＜αn）。
D, when the material flow track test process is carried out, dividing the material flow track test into ore groups for several cycles, wherein each cycle measurement angle comprises a group of ore measurement angles and a group of coke measurement angles with the same number as the ore groups; the test cycles are numbered from small to large according to the included ore angle. E.g., the first cycle comprisesThe following measurement angles: coke angle betap-q、…、βpAnd betam-r、…、βmAngle of ore alphan-i-1、αn-i、…、αn. The a-th cycle contains the following measured angles: coke angle beta1、β2And beta5、β6Angle of ore alpha1、α2、α3。
E, when the material flow track is in the test process, measuring the material flow track of the angle included by each cycle according to the sequence of the measurement cycle numbers from small to large; the coke is measured from a large angle to a small angle in the order of the angle measurement in a single circulation, and then the ore is measured from a large angle to a small angle in the order of the angle measurement in the single circulation. For example, the measurement sequence of the first cycle is: firstly, measuring material flow tracks of coke at various angles, and measuring the sequence: beta is ap-q、…、βp、βm-r、…、βm(ii) a Secondly, measuring the ore material flow track, wherein the measuring sequence is as follows: alpha is alphan-i-1、αn-i、…、αn。
F is used for testing the ore of material flow orbit and surveys the total amount of material, equals the required ore angle number of measuring and every jar of ore weight, and every jar of ore weight satisfies: normal production ore batch weight ÷ normal production ore distribution lap number per batch x 1 < per pot ore weight ÷ normal production ore batch weight per batch x 2.
G is used for the coke of test material stream orbit to survey the sample total amount, equals the coke angle number and every jar of coke weight of required measurement, and every jar of coke weight satisfies: the batch weight of normal production coke is divided by the batch weight of normal production coke, the cloth turn number of each batch of normal production coke is multiplied by 1, the weight of each tank of coke is multiplied by the batch weight of normal production coke, and the cloth turn number of each batch of normal production coke is multiplied by 3.
And H, controlling the opening of the material flow valve when the material flow track is tested according to the normal production and material distribution.
The second stage has the following functions and advantages: the material flow track testing stage is centralized at the position from-6 to-10 of a material line and planned to be carried out, so that the situation that the burden deposit coke layer distribution is disordered and the air permeability of a material column is influenced due to the fact that the material flow track testing stage is provided in the whole charging stage in the material flow track testing process is avoided; by controlling the opening of the material flow valve during testing the material flow track, the material flow size during testing is ensured to be consistent with that during normal production, and the material flow track test result is closer to that during normal production; by controlling the test material amount, the test effect is ensured, meanwhile, each tank of ore can be fully covered by one circle and not more than 2 circles, coke can be fully covered by one circle and not more than 3 circles, the data integrity is ensured, and the influence of the test material amount on the air permeability of the blast furnace is reduced to the maximum extent; the adoption ore coke presss from both sides cloth method makes every cloth circulation have at least one jar coke placement to be located the regional interior survey of ore placement, and has at least one jar coke placement to be located the regional outward survey of ore placement, has guaranteed like this that the ore that is used for the material stream orbit to test distributes the back, has all had the coke to improve its gas permeability, guide the gas stream after the ignition of blowing on at its placement near the center of blast furnace and edge and distributes, does benefit to and adds the wind after the blowing on.
The third phase of the present invention is to blast the blast furnace while in the residual charge charging phase. In the process, when the residual furnace charge is in the charging process, if ignition and blowing-in are required immediately in time, charging is carried out while hot air blowing is selected for the blast furnace; if ignition and blowing-in are not needed temporarily, charging is carried out while cold air is selectively blown into the blast furnace.
When the blast furnace is in the charging stage of the rest furnace burden, the temperature of the cooling air is controlled to be less than or equal to 300 ℃ when the blast furnace is blown with cold air, the pressure difference of the blast furnace is less than or equal to 0.15MPa, and the air quantity is less than or equal to 50% of the normal air quantity of the blast furnace; when blowing hot air into the blast furnace, the air temperature is controlled to be more than or equal to 700 ℃, the pressure difference of the blast furnace is less than or equal to 0.15MPa, and the air quantity is less than or equal to 50 percent of the normal air quantity of the blast furnace.
The third stage has the functions and advantages that: the cold air or hot air blowing in the charging stage of the rest furnace burden can be flexibly mastered, so that the time of opening ignition and production is controlled; the blast furnace is blasted in the charging stage of the rest furnace burden, the falling speed of the furnace burden can be reduced, the pulverization rate of the furnace burden after falling is reduced, powder in the furnace burden can be brought out of the blast furnace from the furnace top through blasting, the amount of powder charged into the furnace in the charging stage is reduced, the loosening degree of a stock column during charging can be increased, and the excessive compaction of the stock column is prevented; when the blast air is selected, the blast air temperature can be reasonably controlled, and the ignition time planning failure caused by the ignition of coke in the charging process can be prevented; the blast volume and the pressure difference can be reasonably controlled, and the air current scouring and furnace charge pulverization caused by overhigh pressure difference in the charging process can be prevented.
Example 1
The method is characterized in that a Xichang steel vanadium 2# blast furnace in 2012 is opened, coke is adopted to fill a hearth during opening, and through calculation, an opening charging table is shown in Table 1, wherein charging is carried out in the sequence of small number of stages to large number of stages.
Charging stage with wind at middle and lower part of furnace body
When the blast furnace is in the charging process of one to six sections, the blast furnace is blown with cold air, the temperature of the cold air is controlled to be less than or equal to 200 ℃ in order to prevent coke ignition in the blowing process, the pressure difference of the blast furnace is controlled to be less than or equal to 0.12MPa in order to prevent furnace burden pulverization, the blowing quantity is 1800m3/min, and the normal air quantity of the blast furnace is about 4000.
TABLE 1 blow-in charging table
And after the sixth section is filled, the theoretical stockline is-12.5 meters, a stock rod is used for detecting the actual stockline to be-12.1 meters, cold air is continuously blown to fill the seventh section of materials, the seventh section contains 14 batches, when 5 of the batches are filled, the theoretical stockline is-10.7 meters, the actual stockline is-10.5 meters, the blast furnace stops blowing, material flow track measuring equipment is installed, and material flow track test is carried out.
(II) material flow track testing stage
According to the fact that the opening degree of the material flow valve is generally 39-41 degrees when the material is normally produced and distributed, the opening degree of the material flow valve is controlled to be 40 degrees when the material flow track is determined to be distributed in the testing stage.
According to actual production needs, the ore material flow tracks of the distribution chute at the following 6 angles are determined and are sequenced from large to small: 39. 36, 33, 30, 27, 24. The ore angles to be measured are grouped according to the principle that the inter-group angle difference is not more than 4: a first group: 39. 36; second group: 33. 30, of a nitrogen-containing gas; third group: 27. 24.
According to actual production needs, the coke material flow track of the distribution chute at the following 12 angles is measured: 45. 42, 39, 36, 33, 30, 27, 24, 21, 18, 15, 12. Because, coke cloth angle satisfies and has 1 coke angle at least and is less than minimum ore angle, and 1 coke angle at least is greater than the biggest ore angle, and the total angular number of coke is greater than or equal to 2 times of the total group number of ore, consequently, does not consider temporarily to increase coke angle number.
The coke distributing angles of the material flow track to be measured are divided into three groups: a first group: 45. 42 and 27, 24; second group: 39. 36 and 21, 18; third group: 33. 30 and 15, 12.
Dividing the material flow track testing process into three cycles, sequentially testing the material flow tracks, measuring the material flow tracks of a third group of ores and a third group of coke in the first cycle, measuring the coke firstly and then measuring the ores, and measuring a large angle firstly and then measuring a small angle (the same in each cycle); a second cycle measuring a second set of ore flow trajectories and a second set of coke flow trajectories; the third cycle measures the first set of ore flow trajectories and the first set of coke flow trajectories. For greater intuition, the various loops are tabulated below in table 2.
TABLE 2 recycle List of material flow trajectories
Note: it can be seen from the above table that in each circulating furnace charge, 2 circles of coke are arranged on the inner circle and the outer circle of each adjacent 2 circles of ore, the distribution mode of the coke is similar to the distribution mode of the furnace charge above and below the test material section, so that the stability of the central and edge air flows of the furnace charge at the section after air supply is ensured, and the current situations that the distribution of the coke of the whole furnace charge is disordered and the furnace charge is degraded after reaching a soft melting zone in the test material stage are improved.
According to the standard that the batch weight of ore is 40 tons in normal production and the number of turns of distribution of each batch of ore is 10 circles, the weight of each tank of ore is 6 tons according to the principle that the weight of each tank of ore is less than 40/10X 1 and less than 40/10X 2. According to the principle that the batch weight of coke is 9.3 tons in normal production, the cloth number of turns of each batch of coke is 12 circles, and the weight of each tank of coke is 2 tons according to the principle that 9.3 is divided by 12X 1 is less than the weight of each tank of coke is less than 9.3 is divided by 12X 3. The total weight of the sample ore is measured to be 36 tons and the total weight of the coke is measured to be 24 tons, which are shown in the following table 3.
TABLE 3 Total amount of test materials
| Variety of (IV) C | Single pot weight (ton) | Number of cans | Total weight (ton) |
| Coke | 2 | 12 | 24 |
| Ore ore | 6 | 6 | 36 |
According to the circulation in the table 2, the material distribution is carried out in the sequence of the small circulation number to the large circulation number, the material flow track is tested, wherein the material distribution is carried out in the sequence of the small circulation number to the large circulation number in each circulation, each angle corresponds to one tank of corresponding furnace materials, and the furnace material amount of each tank is shown in the table 3.
And the material line is-9.6 meters after the material flow track is tested, namely the height difference of the distribution region of the test material on the blast furnace shaft from the beginning to the end of the test is (-9.6) - (-10.5) =0.9 meter. Compared with the traditional method for testing the material flow track from the charging stage of the furnace hearth, the method has the advantages that the material flow track is tested, the material distribution is more concentrated, and the negative influence on the reasonable distribution of the coal gas flow after air supply is less.
(III) residual charge charging stage
And after the material flow track is tested, removing the measuring equipment, and finishing the charging process of the rest furnace burden according to a plan. Because the blow-in time is urgent, the blast furnace is directly ignited by blowing hot air into the blast furnace. Controlling the air temperature of the hot air to be 800 ℃, and reducing the air temperature to 700 ℃ after the air inlet is ignited. In order to prevent furnace charge pulverization, before charging to a specified stockline or natural movement of the material, controlling the blast volume to be less than 1600m3Min, so as to control the blast furnace pressure difference to be less than or equal to 0.12 MPa.
And (3) when the materials are loaded to the eighth section and the 6 th batch, putting down a stock line with the length of-2.9 meters, and finding that the furnace burden begins to naturally fall, namely the materials move after the stock line stops for 1 minute. At this time, the air volume is properly increased to 1800m3Min, and controlling the blast furnace pressure difference to be less than or equal to 0.13 MPa.
When the material line is loaded to the specified material line, the blast furnace is normally operated, and the air quantity is increased to 2000m3And/min. The blast furnace air volume is recovered to 3000m after 24 hours3The blast furnace utilization coefficient reaches 2.0 t/(m) on the blow-in day 43And d), realizing smooth blow-in to reach the yield.
Example 2
The other specific conditions of the blast furnace blowing-in are the same as those of the first embodiment, except that in the third embodiment, the residual charge charging stage.
After the material flow track is tested, the measuring equipment is dismantled and the test is finished according to the planAnd (5) residual burden charging process. Since the blast furnace is required to be started after 10 hours in the preceding and subsequent steps, the blast furnace is blown with cold blast air. Controlling the temperature of cold air to be 200 ℃ to prevent coke ignition in the blowing process, controlling the pressure difference of a blast furnace to be less than or equal to 0.13MPa to prevent furnace charge pulverization, and controlling the blowing quantity to be 1800m3And/min, (about 4000 normal blast furnace air volume), and loading to a position of-1.8 meters of a material line according to a planned loading table. After the materials are charged, the blast furnace stops blowing, and waits for the ignition of the blast furnace.
After 8 hours, the blast furnace is opened for ignition, the material naturally moves after 3 hours of ignition, the material is normally discharged, and the air quantity is restored to 2500m after 24 hours of ignition3The blast furnace utilization coefficient reaches 1.9 t/(m) on the blow-in day 43D), the utilization coefficient of the blast furnace reaches 2.0 on the fifth day, and the smooth blow-in and yield reaching are realized.
Compared with the prior art, the outstanding contribution of the invention lies in that: the method can realize the material loading with air and the material flow track by adopting a laser method, and blast air to the blast furnace when in the residual material loading stage, so that the blast furnace can be quickly recovered with air after being ignited, and the aims of quickly opening the blast furnace and smoothly achieving the production can be realized.
The present invention is not limited to the above-described exemplary embodiments, and various changes and modifications may be made within the scope not departing from the concept of the present invention, and these changes are within the scope of the present invention.
Claims (11)
1. A blast furnace blow-in charging method is characterized by comprising the following steps:
the charging process of the blast furnace is sequentially divided into a charging stage at the middle lower part of a hearth and a furnace body, a material flow track testing stage and a residual furnace charge charging stage according to time sequence;
when the furnace hearth and the furnace body are in the charging stage, blowing cold air to the blast furnace;
when the material flow path test stage is in place, stopping blast of the blast furnace, carrying out material flow path test, and distributing materials in a manner of clamping the ore coke in the material flow path test process;
when in the residual charge charging phase, the blast furnace is blasted.
2. The blast furnace charging method according to claim 1, wherein the blast furnace is controlled to blow cool blast air at a temperature of 300 ℃ or less, a blast furnace pressure difference of 0.12MPa or less, and an air volume of 50% or less of the normal blast furnace air volume.
3. The blast furnace charging method according to claim 1, wherein the charging is performed at a stockline of less than-6 m and more than-10 m while in the material flow trajectory test stage.
4. The blast furnace blow-on charging method according to claim 1, further comprising, when in the charging stage of the hearth and the lower middle portion of the shaft, blowing cold air into the blast furnace after the sleepers are filled, for the blow-on in which the hearth is filled with the sleepers.
5. The blast furnace charging method according to claim 1, wherein the distributing of the ore coke in a cloth-sandwiching manner comprises determining the number of the required material preparation tanks according to the number of distribution angles to be measured, each angle corresponding to one tank of the material;
sorting the ore angles to be measured in the descending order, then grouping the ore angles, wherein the adjacent angles are in the same group, the maximum angle difference of each group is less than or equal to 4 degrees, and numbering each group in the descending order of the angles;
ordering the coke angles to be measured in the order from big to small, and then grouping; the coke angle group number is equal to the group number of the ore angles, each group is numbered according to the sequence of the angles from large to small, at least 1 angle in each group of coke angles is smaller than the minimum value of the ore angles corresponding to the same numbered group, at least 1 angle in each group of coke angles is larger than the maximum value of the ore angles corresponding to the group, and if the coke angles are not met, the coke angles are increased;
dividing the material flow track test into ore groups for a plurality of cycles, wherein each cycle measurement angle comprises a group of ore measurement angles and a group of coke measurement angles with the same number as the ore groups; numbering the test cycles from small to large according to the included ore angles;
measuring material flow tracks of angles included in each cycle from small to large according to the sequence of the measurement cycle numbers;
the coke is measured from a large angle to a small angle in the order of the angle measurement in a single circulation, and then the ore is measured from a large angle to a small angle in the order of the angle measurement in the single circulation.
6. The blast furnace charging method according to claim 1, further comprising controlling a flow valve opening degree at the time of the test flow trajectory in accordance with a normal production burden.
7. The blast furnace charging method according to claim 1, further comprising measuring a total ore sample amount for the test material flow trajectory as a number of desired measured ore angles x a weight of ore per pot, and the weight of ore per pot satisfies: normal production ore batch weight ÷ normal production ore distribution lap number per batch x 1 < per pot ore weight ÷ normal production ore batch weight per batch x 2.
8. The blast furnace charging method according to claim 1, further comprising measuring a total coke measurement value for the flow trajectory by an angle number of coke to be measured x a weight of coke per vessel, wherein the weight of coke per vessel satisfies: the batch weight of normal production coke is divided by the batch weight of normal production coke, the cloth turn number of each batch of normal production coke is multiplied by 1, the weight of each tank of coke is multiplied by the batch weight of normal production coke, and the cloth turn number of each batch of normal production coke is multiplied by 3.
9. The blast furnace blow-on charging method according to claim 1, further comprising, while in a process of charging the remaining charge, if it is desired to ignite the blow-on immediately in time, charging while selecting blast furnace blast air; if ignition and blowing-in are not needed temporarily, charging is carried out while cold air is selectively blown into the blast furnace.
10. The blast furnace blowing-in charging method according to claim 9, wherein when the blast furnace is blown with cold blast air during charging of the remaining charge, the temperature of the cold blast air is controlled to be less than or equal to 300 ℃, the pressure difference of the blast furnace is controlled to be less than or equal to 0.15MPa, and the air volume is controlled to be less than or equal to 50% of the normal air volume of the blast furnace.
11. The blast furnace blowing-in charging method according to claim 9, wherein when the blast furnace is blown with hot air during charging of the remaining burden, the blast furnace temperature is controlled to be not less than 700 ℃, the blast furnace pressure difference is not more than 0.15MPa, and the air volume is not more than 50% of the normal air volume of the blast furnace.
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| CN110551863A (en) * | 2019-09-04 | 2019-12-10 | 首钢京唐钢铁联合有限责任公司 | Material distribution method and device for central area of blast furnace |
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| CN110551863A (en) * | 2019-09-04 | 2019-12-10 | 首钢京唐钢铁联合有限责任公司 | Material distribution method and device for central area of blast furnace |
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