CN111334625A - Parallel tank type bell-less furnace top material distribution control method - Google Patents
Parallel tank type bell-less furnace top material distribution control method Download PDFInfo
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- CN111334625A CN111334625A CN202010143866.3A CN202010143866A CN111334625A CN 111334625 A CN111334625 A CN 111334625A CN 202010143866 A CN202010143866 A CN 202010143866A CN 111334625 A CN111334625 A CN 111334625A
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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
- C21B5/006—Automatically controlling the process
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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
- C21B5/008—Composition or distribution of the charge
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/18—Bell-and-hopper arrangements
- C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
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Abstract
The invention relates to the technical field of blast furnace smelting, in particular to a material distribution control method for a parallel tank type bell-less furnace top. The method comprises the following steps: charging materials into the blast furnace from the tank-combined type bell-less furnace top by utilizing the left charging tank and the right charging tank; before the periodic tank dumping treatment, the material in the left charging bucket is ore, and the material in the right charging bucket is coke; and carrying out periodical reladling treatment on the left side charging bucket and the right side charging bucket according to the length of a first period, and exchanging the materials in the left side charging bucket and the materials in the right side charging bucket mutually. The invention skillfully and uniformly distributes the ores and the coal in the blast furnace by utilizing the characteristic that the resistance of the ores and the materials to the coal gas in the blast furnace is different on the premise of not changing the original structure of the tank-combined bell-less furnace top, thereby realizing uniform distribution of the furnace burden with high efficiency and low cost in the material distribution process of the tank-combined bell-less furnace top.
Description
Technical Field
The invention relates to the technical field of blast furnace smelting, in particular to a material distribution control method for a parallel tank type bell-less furnace top.
Background
The tank type bell-less furnace top has the inevitable 'snake-shaped' offset in the material distribution process due to the characteristics of equipment, so that the furnace burden is unevenly distributed in the blast furnace. The uneven distribution of the furnace burden in the blast furnace can affect the gas distribution in the blast furnace: because the resistance of ore and coke to coal gas is different, the place with more coke has good air permeability and more coal gas distribution, which causes the coal gas distribution in the furnace to be uneven; in addition, the coke and the coal gas are not subjected to indirect reduction, and the utilization rate of the coal gas in the blast furnace is reduced and the fuel consumption of the blast furnace is increased due to the poor utilization rate of the coal gas of the coke; in addition, the uneven distribution of the gas in the circumferential direction influences the shape of the reflow zone and the thickness uniformity of slag crust on the copper cooling wall in the circumferential direction, thereby influencing the rationality of the operation furnace type.
Therefore, the condition of uneven burden distribution exists in the blast furnace for a long time, the normal smelting of the blast furnace is greatly influenced, and finally the condition of the blast furnace is abnormal.
Disclosure of Invention
The invention aims to provide a method for controlling the material distribution of a parallel tank type bell-less furnace top, which is used for ensuring the uniformity of the material distribution in the material distribution process of the parallel tank type bell-less furnace top.
The embodiment of the invention provides a method for controlling material distribution of a parallel tank type bell-less furnace top, which comprises the following steps:
charging materials into the blast furnace from the tank-combined type bell-less furnace top by utilizing the left charging tank and the right charging tank; before the periodic tank dumping treatment, the material in the left charging bucket is ore, and the material in the right charging bucket is coke;
and carrying out periodical reladling treatment on the left side charging bucket and the right side charging bucket according to the length of a first period, and exchanging the materials in the left side charging bucket and the materials in the right side charging bucket mutually.
In a possible embodiment, after charging the blast furnace with the combined-tank bell-less top using the left-side charging bucket and the right-side charging bucket, the method further comprises:
periodically changing the direction of rotation of the chute at a second period length; the chute is used for charging the left charging bucket and the right charging bucket into the blast furnace, and the rotation direction of the chute is clockwise or anticlockwise.
In a possible embodiment, after the periodically dumping the left bucket and the right bucket with the first period length and exchanging the material in the left bucket and the material in the right bucket, the method further includes:
judging whether the difference value between the depth of the left material line and the depth of the right material line in the blast furnace exceeds a first numerical value or not; and if so, reducing the depth of the control stockline so as to keep the depth of the left stockline consistent with the depth of the right stockline.
In a possible embodiment, after the periodically dumping the left bucket and the right bucket with the first period length and exchanging the material in the left bucket and the material in the right bucket, the method further includes:
judging whether the value that the depth of the left material line in the blast furnace is greater than the depth of the right material line exceeds a second value or not; if yes, when the material of the right charging bucket is ore, the cycle length of the periodic tank dumping processing is prolonged, and when the material of the right charging bucket is coke, the cycle length of the periodic tank dumping processing is recovered to be the first cycle length;
judging whether the value that the depth of the right side stockline in the blast furnace is greater than the depth of the left side stockline exceeds a second value or not; if yes, when the material of the left charging bucket is ore, the periodic length of the periodic tank dumping processing is prolonged, and when the material of the left charging bucket is coke, the periodic length of the periodic tank dumping processing is recovered to be the first periodic length.
In a possible embodiment, after the periodically dumping the left bucket and the right bucket with the first period length and exchanging the material in the left bucket and the material in the right bucket, the method further includes:
judging whether the difference value between the depth of the left material line and the depth of the right material line in the blast furnace exceeds a third numerical value or not; if yes, adding a set amount of coke on the deeper side in the step so as to keep the depth of the left-side material line consistent with the depth of the right-side material line.
In one possible embodiment, the adding a predetermined amount of coke to the deeper side of the step to maintain the left side strand depth at the same level as the right side strand depth comprises:
and taking the semicircular area of the blast furnace on the deeper side in the step as a material distribution area, taking fan-shaped material distribution as a material distribution mode, and adding a set amount of coke on the deeper side in the step.
In a possible embodiment, when the material of the right bucket is ore, the method for prolonging the cycle length of the periodical dumping process comprises the following steps:
when the material of the left charging bucket is ore, the cycle length of the periodic tank switching treatment is prolonged to a third cycle length; wherein the third period length is 1.5 to 2 times the first period length.
In a possible embodiment, when the material of the left bucket is ore, the method for prolonging the cycle length of the periodic tank dumping process comprises the following steps:
when the material of the left charging bucket is ore, the cycle length of the periodic tank switching treatment is prolonged to a third cycle length; wherein the third period length is 1.5 to 2 times the first period length.
In a possible embodiment, the total number of times of the periodical tank-pouring treatment on the left bucket and the right bucket is even; the second period length is half of the first period length.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention utilizes the left charging bucket and the right charging bucket to charge materials into the blast furnace from the pot-combination type bell-less furnace top, periodically exchanges the materials in the left charging bucket and the right charging bucket, and skillfully and uniformly distributes ores and coal in the blast furnace by utilizing the characteristic of different coal gas resistances of the ores and the materials in the blast furnace on the premise of not changing the original structure of the pot-combination type bell-less furnace top, thereby realizing uniform distribution of furnace materials with high efficiency and low cost in the process of distributing materials on the pot-combination type bell-less furnace top.
Furthermore, the invention also changes the rotation direction of the chute periodically, and the snake-shaped offset caused by the existing equipment structure appears symmetrically, thereby skillfully eliminating the influence of the snake-shaped offset on uniform distribution and ensuring the uniformity of the burden distribution in the distribution process of the pot-combination bell-less furnace top.
Furthermore, when the difference between the left side stockline depth and the right side stockline depth is detected to be larger and reaches a first numerical value, the method uses the stockline depth control technology to keep the depth of the stocklines on the two sides consistent.
Further, when the difference between the depth of the left material line and the depth of the right material line is detected to be larger and reaches a second numerical value, the period length in the periodic tank transfer processing process is changed, so that the depths of the two material lines are kept consistent.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present specification, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart of a possible method for controlling the distribution of a tank-type bell-less top according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the scope of protection of the embodiments of the present invention.
The embodiment of the invention provides a possible coal gas control method in blast furnace smelting. Referring to fig. 1, fig. 1 is a flowchart of an embodiment of the method, which specifically includes steps 11 to 12.
Step 11, charging materials into the blast furnace from the tank-connected bell-less top by utilizing the left charging tank and the right charging tank; before the periodical tank-switching treatment, the material in the left charging bucket is ore, and the material in the right charging bucket is coke.
Specifically, in this embodiment, the left side charging bucket and the right side charging bucket are respectively located at the left side and the right side of the tank-type bellless furnace top, and before subsequent periodical tank-pouring processing, the material stored in the left side charging bucket is ore, specifically, sintered ore, pellet ore, lump ore, coke, and the like, and the material stored in the right side charging bucket is coke.
And 12, performing periodical dumping treatment on the left charging bucket and the right charging bucket according to a first period length, and exchanging the materials in the left charging bucket and the right charging bucket.
Specifically, the first period length represents the meaning: and performing the tank switching treatment on the left charging bucket and the right charging bucket every a first period length.
Specifically, the first period length may be a specific time length, for example, 30 minutes per charge, the tank-changing process is performed; it is also possible to perform a reladling process for batches of charge, for example 10 batches per charge.
Specifically, the process of transferring the cans means that materials loaded in the left side charging can and the right side charging can are exchanged, for example, the materials in the left side charging can are ores, the materials in the right side charging can are cokes, and then the materials in the left side charging can are cokes and the materials in the right side charging can become ores through the process of transferring the cans once.
This embodiment adopts this kind of scheme of periodic reladling processing, utilizes the just inevitable defect that equipment exists, and at the in-process of loading of a plurality of periods of left and right sides charging bucket, make ore material and coke material "snakelike" skew appear in turn, has guaranteed the unanimity of the left and right sides material degree of depth, makes the cloth process evenly go on.
The invention also provides a possible embodiment for more uniform and stable control of the distribution of the charge in the blast furnace.
The specific scheme is as follows: after charging the blast furnace with the left-side charging bucket and the right-side charging bucket on the parallel-tank type bell-less top, the method further comprises a step 13.
Step 13, periodically changing the rotation direction of the chute according to the second period length; the chute is used for charging the left charging bucket and the right charging bucket into the blast furnace, and the rotation direction of the chute is clockwise or anticlockwise.
Specifically, the second period length represents the following meaning: the direction of rotation of the chute is changed every second period length.
Specifically, the second cycle length may be a specific time period, for example, the rotation direction changing process is performed every 15 minutes of charging; it is also possible to perform a change of direction of rotation process for batches of charges, for example 5 batches per charge.
Specifically, in this embodiment, only one chute is provided in the blast furnace, and the material of the left side charging bucket and the material of the right side charging bucket enter the chute through one Y-shaped pipe and are distributed into the blast furnace through the chute. The left charging bucket and the right charging bucket are both used for charging materials into the blast furnace by a chute structure. The chute can rotate along the clockwise direction or the anticlockwise direction, so that the materials in the charging bucket are uniformly distributed in the blast furnace. But due to the inherent defects of the chute structure, the problem of uneven distribution can occur in the distribution process. In the embodiment, the rotation direction of the chute is periodically changed, so that the unevenness in the material distribution process repeatedly occurs along the clockwise direction and the anticlockwise direction, and the unevenness in the anticlockwise direction is offset by the unevenness in the clockwise direction, thereby ensuring the uniformity in the material distribution process.
In a preferred example, the total number of times of the periodical dumping treatment on the left bucket and the right bucket is even; the second period length is half of the first period length.
This provides the following two benefits:
1. the total times of the periodical tank-reversing treatment are even numbers, so that the times of loading ores and coke in the left charging bucket are the same as those of loading ores and coke in the right charging bucket, and the uniform distribution of furnace burden when charging is better ensured in the charging of the charging buckets on the two sides;
2. the second period length is half of the first period length, so that the change of the rotating direction of the chute is included twice in each reladling treatment process, namely, the clockwise charging operation of the chute for the same time length or batch and the anticlockwise charging operation of the chute for the same time length or batch are included in each reladling treatment process, and therefore the uniform distribution of the burden materials of the charging buckets on two sides during charging is better ensured.
In the actual production, the uneven distribution of the burden can also occur through the charging control, and the invention also provides a possible embodiment in order to quickly and flexibly keep the depths of the burden on the left side and the right side consistent.
The specific scheme is as follows: after the periodic dumping processing is performed on the left-side charging bucket and the right-side charging bucket according to the first period length and the materials in the left-side charging bucket and the right-side charging bucket are exchanged, the method further includes step 14.
Step 14, judging whether the difference value between the depth of the left material line and the depth of the right material line in the blast furnace exceeds a first numerical value; and if so, reducing the depth of the control stockline so as to keep the depth of the left stockline consistent with the depth of the right stockline.
Specifically, in this embodiment, a mechanical probe is used to measure the burden line depth of the burden in the blast furnace. In the embodiment, the left mechanical stock rod is arranged on the left side of the blast furnace and used for measuring the depth of a left stockline, and the right mechanical stock rod is arranged on the right side of the blast furnace and used for measuring the depth of a right stockline. Of course, a laser type level meter or a microwave type level meter may be used to measure the burden line depth of the burden.
Specifically, the difference between the depth of the left side stockline and the depth of the right side stockline in the blast furnace is an absolute value, and the depth of the left side stockline can be greater than the depth of the right side stockline and can also be less than the depth of the right side stockline.
Specifically, the first value can be flexibly selected according to actual production needs and equipment capacity.
Specifically, controlling the stockline depth means that the charging into the blast furnace is required when the level in the blast furnace is lowered to that value. In actual operation, the relationship between the burden distribution and the depth of the control stockline is as follows: under other conditions, the deeper the depth of the control burden line, the closer the pile tip is to the edge, and the more burden is distributed at the edge. In the embodiment, the depth of the control stockline is reduced, so that the stacking tip is gradually close to the shallower side, and the depths of the stocklines on the left side and the right side are kept consistent.
In the actual production, the uneven distribution of the burden can also occur through the charging control, and the invention also provides a possible embodiment in order to quickly and flexibly keep the depths of the burden on the left side and the right side consistent.
The specific scheme is as follows: and after the left charging bucket and the right charging bucket are subjected to periodical dumping treatment by the first period length and the materials in the left charging bucket and the right charging bucket are exchanged, the method further comprises the steps 15 to 16.
Step 15, judging whether the value that the depth of the left material line in the blast furnace is greater than the depth of the right material line in the blast furnace exceeds a second value or not; if yes, when the material of the right charging bucket is ore, the cycle length of the periodic tank dumping processing is prolonged, and when the material of the right charging bucket is coke, the cycle length of the periodic tank dumping processing is recovered to be the first cycle length.
Specifically, in this embodiment, a mechanical probe is used to measure the burden line depth of the burden in the blast furnace. In the embodiment, the left mechanical stock rod is arranged on the left side of the blast furnace and used for measuring the depth of a left stockline, and the right mechanical stock rod is arranged on the right side of the blast furnace and used for measuring the depth of a right stockline. Of course, a laser type level meter or a microwave type level meter may be used to measure the burden line depth of the burden.
Specifically, the depth of the left-side material line in the blast furnace is greater than that of the right-side material line, which indicates that the amount of coke in the left-side material is less than that of the right-side material, so that the depths of the material lines on the two sides can be kept consistent again by prolonging the coke charging time of the left-side charging bucket.
In a preferred example, when the material of the right charging bucket is ore, the cycle length of the periodical dumping process is prolonged, and the step 1.1 is included.
Step 1.1, when the material of the left charging bucket is ore, prolonging the cycle length of the periodic tank-switching treatment to a third cycle length; wherein the third period length is 1.5 to 2 times the first period length.
Specifically, the selection of the length of the third period is very important for reducing the depth difference of the stocklines on the two sides, the value of the length of the third period is too small, the effect of reducing the depth difference of the stocklines on the two sides in each reladling treatment period is not obvious, the recovery time is too slow, the distribution of coal gas in a blast furnace is influenced, and the coal gas is wasted; and the number value of the third period is too large, the effect of reducing the depth difference of the stocklines on the two sides in each tank transferring treatment period is too obvious, and the condition of over-adjustment is easy to occur, so that the depth difference of the stocklines on the two sides is caused to occur newly. In the embodiment, the length of the third period is 1.5 to 2 times of the length of the first period, so that the depth difference of the material lines on the two sides can be stably and quickly reduced, and the depth of the material lines on the two sides can be recovered to be consistent.
Step 16, judging whether the value that the depth of the right side stockline in the blast furnace is greater than the depth of the left side stockline exceeds a second value or not; if yes, when the material of the left charging bucket is ore, the periodic length of the periodic tank dumping processing is prolonged, and when the material of the left charging bucket is coke, the periodic length of the periodic tank dumping processing is recovered to be the first periodic length.
Specifically, the depth of the right-side burden line in the blast furnace is greater than that of the left-side burden line, which indicates that the amount of coke in the right-side burden is less than that of the right-side burden, so that the depths of the burden lines on the two sides can be kept consistent again by prolonging the coke charging time of the right-side charging bucket.
In a preferred example, when the material of the left charging bucket is ore, the period length of the periodic tank dumping process is prolonged, and the step 2.1 is included.
Step 2.1, when the material of the left charging bucket is ore, prolonging the cycle length of the periodic tank-switching treatment to a third cycle length; wherein the third period length is 1.5 to 2 times the first period length.
Specifically, the selection of the length of the third period is very important for reducing the depth difference of the stocklines on the two sides, the value of the length of the third period is too small, the effect of reducing the depth difference of the stocklines on the two sides in each reladling treatment period is not obvious, the recovery time is too slow, the distribution of coal gas in a blast furnace is influenced, and the coal gas is wasted; and the number value of the third period is too large, the effect of reducing the depth difference of the stocklines on the two sides in each tank transferring treatment period is too obvious, and the condition of over-adjustment is easy to occur, so that the depth difference of the stocklines on the two sides is caused to occur newly. In the embodiment, the length of the third period is 1.5 to 2 times of the length of the first period, so that the depth difference of the material lines on the two sides can be stably and quickly reduced, and the depth of the material lines on the two sides can be recovered to be consistent.
In the actual production, the uneven distribution of the burden can also occur through the charging control, and the invention also provides a possible embodiment in order to quickly and flexibly keep the depths of the burden on the left side and the right side consistent.
The specific scheme is as follows: and after the periodic dumping treatment is carried out on the left charging bucket and the right charging bucket according to the first period length and the materials in the left charging bucket and the right charging bucket are exchanged, the method further comprises a step 17.
Step 17, judging whether the difference value between the depth of the left material line and the depth of the right material line in the blast furnace exceeds a third numerical value; if yes, adding a set amount of coke on the deeper side in the step so as to keep the depth of the left-side material line consistent with the depth of the right-side material line.
Specifically, because the coke layer has better gas permeability, it is less to the regional air current influence of deep chi behind the additional coke, still need keep the stability of coal gas when control stock rule degree of depth, this embodiment makes both sides stockline resume unanimously through direct additional coke at deep chi. In addition, the coke layer can also improve the condition of uneven coal gas caused by other reasons.
In a preferred example, the deeper side of the step is supplemented with a set amount of coke to maintain the left side strand depth at the same depth as the right side strand depth, including step 3.1.
And 3.1, taking the semicircular area of the blast furnace at the deeper side in the step as a material distribution area, taking fan-shaped material distribution as a material distribution mode, and adding a set amount of coke at the deeper side in the step.
Specifically, this embodiment provides a better way to add coke, which facilitates the recovery of consistent depth of the two side stocklines.
Specifically, in this embodiment, a mechanical probe is used to measure the burden line depth of the burden in the blast furnace. In the embodiment, the left mechanical stock rod is arranged on the left side of the blast furnace and used for measuring the depth of a left stockline, and the right mechanical stock rod is arranged on the right side of the blast furnace and used for measuring the depth of a right stockline. The specific calculation mode of the quantity of the additional coke is that the area of a circular ring where the mechanical gauge on the deeper side is located is half multiplied by the difference value of the depths of the stocklines on the two sides, and then the product is multiplied by the bulk density of the coke.
The following is 5500m3The control process of this embodiment is illustrated by taking the blast furnace bell-less top burden distribution as an example.
Application case 1
The smelting period of the blast furnace is 40 batches, and the length of the tank-pouring period is determined to be 10 batches; when the statistics is started, coke is filled on the right side, and ores are filled in the left side; pouring 10 batches of materials, emptying ores in the left charging bucket, and then starting to charge coke; the right charging bucket begins to charge ores; after 10 batches, continuously switching the charging mode of the charging bucket, and circularly alternating;
in addition, the rotating direction of the chute is clockwise rotation when the statistics is started; after 5 batches are loaded, the rotating direction of the chute is changed into anticlockwise rotation; after 5 batches, the batch was cut back into a clockwise rotation, alternating cyclically.
Application case 2
When the depth of the stockline measured by the left mechanical stock rod is 1.5m, the depth of the stockline measured by the right mechanical stock rod is 2.1m, the depth of the charge level in the east-west direction is different by 0.6m and exceeds a first value by 0.5m, the depth of the stockline controlled by the blast furnace is changed from 1.5m to 1.4m, namely when the depths of the two stock rods reach 1.4m, the blast furnace starts to charge; and when the deviation of the material scales on the two sides is less than 0.5m, recovering the control of the material line of 1.5 m.
Application case 3
When the depth of the left mechanical material ruler is more than 0.5m greater than that of the right mechanical material ruler, the period of ore loading of the right material bucket is prolonged to 15 batches from the original 10 batches, namely, the left material bucket is changed into the right material bucket after 10 batches of ore loading; charging 15 batches of ores into the right material tank and then charging the ores into the left material tank; and (5) charging ores in the right charging bucket after 10 batches, and performing alternate circulation in such a way, and recovering normal dumping when the deviation ruler is less than 0.5 m.
Application case 4
When the depth of the left side stockline is deeper than that of the right side stockline by more than 1m, a half batch of coke is added to the left half side of the blast furnace, a fan-shaped distribution mode is adopted, and the feeding angle is 40 degrees of the coke angle corresponding to the falling point in the stockline area.
The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:
according to the embodiment of the invention, the left charging bucket and the right charging bucket are used for charging the blast furnace from the pot-combination type bell-less furnace top, the materials in the left charging bucket and the right charging bucket are periodically exchanged, and on the premise of not changing the original structure of the pot-combination type bell-less furnace top, the ore and the coal are ingeniously and uniformly distributed in the blast furnace by utilizing the characteristics of different coal gas resistances of the ore and the materials in the blast furnace, so that the uniform distribution of the furnace materials is efficiently realized at low cost in the process of distributing the material on the pot-combination type bell-less furnace top.
Furthermore, the embodiment of the invention also changes the rotation direction of the chute periodically, and the snake-shaped offset caused by the existing equipment structure appears symmetrically, thereby skillfully eliminating the influence of the snake-shaped offset on uniform distribution and ensuring the uniformity of the burden distribution in the distribution process of the tank-combined bell-less furnace top.
Further, when the difference between the depth of the left material line and the depth of the right material line is detected to be larger and reaches a first value, the depth of the material lines on the two sides is kept consistent by using a material line depth control technology.
Further, when the difference between the depth of the left material line and the depth of the right material line is detected to be larger and reaches a second value, the period length in the periodic tank transfer processing process is changed, so that the depths of the material lines on the two sides are kept consistent.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A method for controlling the distribution of a parallel tank type bell-less furnace top is characterized by comprising the following steps:
charging materials into the blast furnace from the tank-combined type bell-less furnace top by utilizing the left charging tank and the right charging tank; before the periodic tank dumping treatment, the material in the left charging bucket is ore, and the material in the right charging bucket is coke;
and carrying out periodical reladling treatment on the left side charging bucket and the right side charging bucket according to the length of a first period, and exchanging the materials in the left side charging bucket and the materials in the right side charging bucket mutually.
2. The method of controlling the distribution of the pot-and-tank bell-less top according to claim 1, wherein after the charging of the blast furnace with the pot-and-tank bell-less top, the method further comprises:
periodically changing the direction of rotation of the chute at a second period length; the chute is used for charging the left charging bucket and the right charging bucket into the blast furnace, and the rotation direction of the chute is clockwise or anticlockwise.
3. The pot-merged bell-less top distribution control method as claimed in claim 1 or 2, wherein said periodically dumping the left and right buckets for a first period length, after exchanging the material in the left bucket with the material in the right bucket, the method further comprises:
judging whether the difference value between the depth of the left material line and the depth of the right material line in the blast furnace exceeds a first numerical value or not; and if so, reducing the depth of the control stockline so as to keep the depth of the left stockline consistent with the depth of the right stockline.
4. The pot-merged bell-less top distribution control method as claimed in claim 1 or 2, wherein said periodically dumping the left and right buckets for a first period length, after exchanging the material in the left bucket with the material in the right bucket, the method further comprises:
judging whether the value that the depth of the left material line in the blast furnace is greater than the depth of the right material line exceeds a second value or not; if yes, when the material of the right charging bucket is ore, the cycle length of the periodic tank dumping processing is prolonged, and when the material of the right charging bucket is coke, the cycle length of the periodic tank dumping processing is recovered to be the first cycle length;
judging whether the value that the depth of the right side stockline in the blast furnace is greater than the depth of the left side stockline exceeds a second value or not; if yes, when the material of the left charging bucket is ore, the periodic length of the periodic tank dumping processing is prolonged, and when the material of the left charging bucket is coke, the periodic length of the periodic tank dumping processing is recovered to be the first periodic length.
5. The pot-merged bell-less top distribution control method as claimed in claim 1 or 2, wherein said periodically dumping the left and right buckets for a first period length, after exchanging the material in the left bucket with the material in the right bucket, the method further comprises:
judging whether the difference value between the depth of the left material line and the depth of the right material line in the blast furnace exceeds a third numerical value or not; if yes, adding a set amount of coke on the deeper side in the step so as to keep the depth of the left-side material line consistent with the depth of the right-side material line.
6. The pot-in bell-less top distribution control method of claim 5, wherein said adding a set amount of coke to the deeper side in this step to maintain the left side stockline depth and the right side stockline depth in agreement comprises:
and taking the semicircular area of the blast furnace on the deeper side in the step as a material distribution area, taking fan-shaped material distribution as a material distribution mode, and adding a set amount of coke on the deeper side in the step.
7. The method for controlling the material distribution on the pot-merged type bell-less furnace top according to the claim 4, wherein the step of prolonging the cycle length of the periodical tank-pouring process when the material of the right charging bucket is ore comprises the following steps:
when the material of the left charging bucket is ore, the cycle length of the periodic tank switching treatment is prolonged to a third cycle length; wherein the third period length is 1.5 to 2 times the first period length.
8. The method for controlling the material distribution on the pot-merged type bell-less top of a furnace according to claim 4, wherein the step of prolonging the cycle length of the periodical tank-pouring process when the material of the left charging bucket is ore comprises the steps of:
when the material of the left charging bucket is ore, the cycle length of the periodic tank switching treatment is prolonged to a third cycle length; wherein the third period length is 1.5 to 2 times the first period length.
9. The pot-merged bell-less top distribution control method of claim 1, wherein the total number of times of the periodical dumping process for the left-side bucket and the right-side bucket is an even number of times; the second period length is half of the first period length.
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