CN114015824B - Blast furnace smelting control process for increasing pellet ore proportion - Google Patents
Blast furnace smelting control process for increasing pellet ore proportion Download PDFInfo
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- CN114015824B CN114015824B CN202111270157.2A CN202111270157A CN114015824B CN 114015824 B CN114015824 B CN 114015824B CN 202111270157 A CN202111270157 A CN 202111270157A CN 114015824 B CN114015824 B CN 114015824B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a blast furnace smelting control process for increasing pellet ore proportion, which comprises the following steps: in order to reduce the influence of the rolling of the pellets on the shape of the charge surface, the material discharge sequence is actively changed, and the acid pellets and the alkaline pellets are placed in the middle of the charge section to form a material discharge mode that the sinter at the head of the charge and the sinter at the middle of the charge are placed at the lower layer, and the sinter at the acid pellets and the alkaline pellets are placed at the upper layer and the sinter at the tail of the charge; the thickness of the coke layer at the furnace waist of the blast furnace is adjusted to 220-230mm from 205mm of the normal charging structure, and the thickness of the coke layer at the furnace throat is adjusted to 490-500mm from 463mm of the normal charging structure. The invention aims to provide a blast furnace smelting control process for increasing the pellet proportion, which starts from an important transition node, effectively solves the problem of furnace condition fluctuation generated in the pellet proportion increasing process, and creates sufficient conditions for exerting the smelting advantages of high-proportion pellets and improving the economic indexes of a blast furnace.
Description
Technical Field
The invention relates to the technical field of blast furnace adjustment and control of an iron-making system, in particular to a blast furnace smelting control process for increasing pellet ore proportion.
Background
As a carbon emission large household, steel enterprises are compelling to transform and upgrade towards the directions of green, low carbon, energy conservation, consumption reduction and the like, a steel ladle currently issues a double-carbon development planning route map and a time line, and the development of blast furnace high-proportion pellet smelting becomes a current more mature carbon reduction technology attack direction based on the steel ladle prior art storage and the Baiyue obo iron ore mining capacity.
Compared with sintered ore, the pellet ore has the advantages of high iron-containing grade, uniform granularity, high cold strength, low FeO content, good reducibility and the like, and the pellet ore is used in a large amount in the blast furnace burden structure, so that the furnace feeding grade is obviously improved, the slag ratio is obviously reduced, and the utilization economic index is improved. Firstly, the pellets are easy to roll, and the rolling is more obvious along with the continuous increase of the proportion of the pellets, so that the shape of the charge surface is difficult to stabilize, and the stability of the gas flow is reduced; secondly, the pellets are easy to expand when being heated and reduced, which affects the uniformity of the blast furnace blanking and further affects the stability of the blast furnace condition; finally, the soft melting temperature of the pellet ore is low, in the process of furnace burden descending, the soft melting area is widened due to premature softening, the soft melting zone of the blast furnace is thickened, the root of the soft melting zone moves upwards integrally, the air permeability of the material column is deteriorated, the pressure difference of the blast furnace is increased, and the distribution of gas flow is influenced. Aiming at the situation, the design of a set of control process capable of reducing the influence of high-proportion pellets in the furnace has stronger practical significance.
Disclosure of Invention
The invention aims to provide a blast furnace smelting control process for increasing the pellet proportion, which starts from an important transition node, effectively solves the problem of furnace condition fluctuation generated in the pellet proportion increasing process, and creates sufficient conditions for exerting the smelting advantages of high-proportion pellets and improving the economic indexes of a blast furnace.
In order to solve the technical problem, the invention adopts the following technical scheme:
the invention relates to a blast furnace smelting control process for increasing pellet ore proportion, which comprises the following steps:
in order to reduce the influence of the rolling of the pellets on the shape of the charge surface, the material discharging sequence is actively changed, and the acid pellets and the alkaline pellets are placed in the middle of the charge section to form a material discharging mode that the sinter at the head of the charge and the sinter at the middle of the charge are placed at the lower layer, and the acid pellets and the alkaline pellets are placed at the upper layer and the sinter at the tail of the charge;
the thickness of the coke layer at the furnace waist of the shaft furnace is adjusted to 220-230mm from 205mm of the normal charging structure, and the thickness of the coke layer at the furnace throat is adjusted to 490-500mm from 463mm of the normal charging structure.
Further, the furnace burden structure collocation is calculated according to the mass percentage as follows: 35% fluxed pellets +15% acid pellets +50% sinter.
Further, after the proportion of the pellets is increased to 35%, the stockline should be reduced to 1.4-1.5m, after the proportion of the pellets is increased to 40%, ore in the distribution matrix should be increased by 1 grade, an ore platform is widened to more than 1.20m, and the area of the ore endless belt can reach 50% or more of the cross section area of the blast furnace throat.
Compared with the prior art, the invention has the beneficial technical effects that:
the blast furnace finally realizes the furnace burden structure matching of 35 percent of fluxed pellets, 15 percent of acid pellets and 50 percent of sinter, and the blast furnace is stable and smooth as a whole during the test, has no abnormal phenomenon and has good economic indexes.
Detailed Description
The present invention will be further described with reference to examples.
Steel-clad base 2200m 3 The blast furnace has been subjected to a high proportion pellet industrial test of 70 days in 1 month of 2021, this test being at 1500m 3 The blast furnace finally realizes the charge material structure collocation of 35 percent of fluxed pellets, 15 percent of acid pellets and 50 percent of sinter ore by continuously demonstrating and optimizing the test scheme and combining the defects of the previous industrial test, and the whole blast furnace is stable and smooth in the test period, has no abnormal phenomenon and has good economic index stability.
A blast furnace smelting control process for increasing pellet ore proportion comprises the following steps:
when the proportion of the pellets is increased to more than 35 percent, in order to reduce the influence of the pellet rolling on the shape of the charge level, the discharging sequence is actively changed, and the acid pellets and the alkaline pellets are placed in the middle of the charge section to form a discharging mode that the sinter in the head section and the middle section is placed in the lower layer, and the sinter in the acid pellets and the alkaline pellets is placed in the upper layer and the sinter in the tail section, so that after the charge enters the charging bucket, the pellets can be effectively ensured to be positioned in the middle of the charging bucket, the rolling effect of the pellets to the center and the edge in the material distribution process is further reduced, and the influence on the air flow of the center and the edge is finally reduced.
At a certain seat of ladle steel 1500m 3 In the course of the industrial tests of the blast furnace,operators find that when the proportion of the pellets is increased to 40% and 45-50%, the fluctuation of the furnace conditions is severe, the wind pressure relationship is obviously tightened, and the fluctuation resistance of the blast furnace is reduced integrally, and the analysis reason is mainly that the metallurgical performance of furnace materials is partially changed along with the increase of the proportion of the pellets, so that the change of a soft melting zone of the blast furnace is caused, the gas flow distribution is disturbed, and the integral operation furnace type is changed. Therefore, in the process of the test, special attention is paid to the transition of the two time nodes, before the proportion of the pellets is increased to 40%, the transition is increased by 1 percentage point basically according to 0.5-1 day, when the ball ratio is increased to be about 40%, the observation time needs to be slowed, the observation period is increased to be 2 days from 1 day, when the ball ratio is increased to be about 45%, the observation period is increased to be 3 days from 2 days, if the relationship of the pressure quantity is continuously biased, and important parameters do not accord with the lifting condition, the observation time can be further prolonged. The parameters that need to be observed with emphasis here include: whether the fluctuation amplitude of the air volume exceeds 3% in the observation period or not; whether the pressure and the differential pressure of the hot air exceed the specified upper limit or not is determined for 2 times; whether the phenomena of sliding rule, deviation rule and falling rule are serious exists in blanking; whether the permeability index has a rapid deterioration phenomenon or not; per time of iron [ si ]]Whether the matching degree with the physical temperature is reasonable or not, whether the KTP index can be ensured to be more than 1.90 or not and the like. Meanwhile, the control of the upper regulation is fully combined in an observation period, wherein the primary concern is to control the coke load of the blast furnace, the charging grade of the blast furnace is continuously increased along with the increase of the proportion of the pellets under the condition of unchanging the outside, the theoretical coke ratio is in a descending trend, conditions are created for ensuring the activity of a furnace cylinder and the permeability of a dead charge column and further increasing the proportion of the pellets, the coke load of the blast furnace is properly adjusted to be 0.2-0.3t/t, and after calculation, when the thickness of a coke layer at the furnace waist of the blast furnace is adjusted to be 220-230mm from 205mm of a normal charge structure, and the thickness of a coke layer at the furnace throat is adjusted to be 490-500mm from 463mm of the normal charge structure, the subsequent production can be met.
The charging system plays a decisive role in the distribution of the blast furnace blocky belt airflow, and the reasonable distribution of the coal gas flow is usually realized by adjusting the distribution matrix and the stockline. In the experiment, after the proportion of the pellets is increased to 35%, the stockline is reduced to 1.4-1.5m, and after the proportion of the pellets is increased to 40%, the ore in the distribution matrix is increased by 1 grade, the ore platform is widened to more than 1.20m, and the area of the ore endless belt can reach 50% of the sectional area of the blast furnace throat. Meanwhile, pellets in the edge area are properly reduced, the phenomenon that the rising amplitude of the root of the soft melting zone is too large is avoided, and therefore the influence of the pellets at the edge on the furnace condition is weakened, the effects of preventing the middle lower part of the furnace body from being thickened, reducing the pressure difference and ensuring abundant central airflow are achieved, and finally a foundation is laid for improving the overall stability of the furnace condition. The adjustment changes of the blast furnace burden distribution matrix are shown in table 1.
TABLE 1 adjustment of burden distribution matrix and ore-coke ratio during the increase of pellet proportion in a blast furnace
As can be seen from Table 1, in the process of gradually increasing the pellet proportion, when the 10-gear position of the distribution matrix is at 40% and 50% of the ball ratio, the radial ore-coke ratio is respectively reduced by 1.47t/t and 1.1t/t compared with the 30% of the ball ratio, and meanwhile, when considering the edge airflow, the development of the central airflow is also emphasized in the adjustment of the distribution matrix, wherein when the 4-gear position is at 50% of the ball ratio, the radial ore-coke ratio is reduced by 0.71t/t compared with the 40% of the ball ratio. Through series adjustment, the steel cladding finishes the first 50 percent of pellet proportion of 2200m 3 The successful application of the blast furnace also opens up a new path for enterprises to optimize the furnace charge structure and improve the industrial competitiveness.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (2)
1. A blast furnace smelting control process for increasing pellet ore proportion is characterized by comprising the following steps:
in order to reduce the influence of the rolling of the pellets on the shape of the charge surface, the material discharging sequence is actively changed, and the acid pellets and the alkaline pellets are placed in the middle of the charge section to form a material discharging mode that the sinter at the head of the charge and the sinter at the middle of the charge are placed at the lower layer, and the acid pellets and the alkaline pellets are placed at the upper layer and the sinter at the tail of the charge;
the thickness of a coke layer at the furnace waist of the blast furnace is adjusted to 220-230mm from 205mm of a normal charging structure, and the thickness of the coke layer at the furnace throat is adjusted to 490-500mm from 463mm of the normal charging structure;
after the proportion of the pellets is increased to 35%, the stockline is reduced to 1.4-1.5m, after the proportion of the pellets is increased to 40%, ore in the material distribution matrix is increased by 1 grade, the ore platform is widened to more than 1.20m, and the area of the ore ring belt is ensured to reach 50% of the sectional area of the blast furnace throat.
2. The blast furnace smelting control process for increasing the proportion of the pellets as claimed in claim 1, wherein the charge material structure collocation is calculated by mass percent as follows: 35% fluxed pellets +15% acid pellets +50% sinter ore.
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| CN114959258B (en) * | 2022-05-30 | 2024-06-18 | 广东韶钢松山股份有限公司 | Smelting method of blast furnace high-proportion pellets |
| CN115386666B (en) * | 2022-09-15 | 2023-08-25 | 包头钢铁（集团）有限责任公司 | Method for improving yield and reducing consumption of blast furnace under special mining smelting condition of baiyunebo |
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