Operation method for stable operation of high-titanium vanadium-titanium magnetite large blast furnace

Abstract

The application discloses an operation method for stable and smooth operation of a high-titanium vanadium-titanium magnetite large-sized blast furnace, and belongs to the technical field of blast furnace operation. The operation method comprises the following steps: a burden distribution system: the furnace throat is divided into 12 circular rings by an equal-area matrix, the ore falling points are distributed in the 5th to 10th rings, the sum of the proportion of the edge coke and the center coke is in the range of 70-80%, a burden matrix is formed based on a plurality of historical burden data, the ore burden angle is set based on the burden line length, and the blast furnace throat temperature is controlled to be 60-120 DEG C; an air supply system: under normal production conditions, a symmetrical tuyere layout of two tuyeres is adopted, the areas of the two tuyeres are different, and the tuyere area is adjusted based on the air volume under the medium and long term abnormal production conditions; a slagging system and a heat system. The application solves the difficult problems of the high-titanium vanadium-titanium magnetite large-sized blast furnace, such as the difficulty in improving the performance of the smelting burden, the difficulty in adjusting the operation of the blast furnace strengthening smelting, and the difficulty in recovering the blast furnace condition fluctuation, and realizes the long-term stable and smooth operation and the efficient smelting of the high-titanium vanadium-titanium magnetite large-sized blast furnace.

Description

Technical Field

[0001] This invention relates to the field of blast furnace smelting technology, and in particular to an operation method for the stable and smooth operation of a large blast furnace for high-titanium vanadium-titanium magnetite. Background Technology

[0002] my country's vanadium-titanium magnetite resources are mainly concentrated in the Panxi region, accounting for about 20% of the country's iron ore reserves. This high-titanium vanadium-titanium magnetite differs significantly from ordinary ore in its smelting technology. During smelting, it frequently encounters problems such as sticky slag, foaming, indistinct slag-iron separation, poor desulfurization performance, high iron loss, and hearth accumulation, making blast furnace smelting extremely difficult. Over the past 50 years since its commissioning, Panzhihua Iron and Steel Group's blast furnace has undergone extensive technological research. With continuous improvement in raw material technology, equipment levels, and smelting techniques, and the implementation of technologies such as high-basicity sintering, optimized furnace charge structure with the addition of all-vanadium-titanium pellets, and oxygen-enriched pulverized coal injection for enhanced smelting, the main technical and economic indicators of the blast furnace have significantly improved, reaching the advanced level of ordinary ore blast furnace smelting. With the demands of high-quality development in the new era, new requirements have been placed on the green and efficient development of the vanadium-titanium magnetite resource comprehensive utilization industry to enhance the competitiveness of the entire industrial chain and all factors of the market.

[0003] Xichang Steel and Vanadium Three Towers, 1750m 3 The successful commissioning of this blast furnace makes it the second largest blast furnace in the world for smelting high-titanium vanadium-titanium magnetite (the largest being the new No. 3 blast furnace of Panzhihua Iron and Steel Group, with a volume of 2000m³). 3 The increased size of blast furnaces presents challenges due to higher raw material quality requirements and operational difficulties. High-titanium sinter undergoes severe low-temperature reduction and pulverization, resulting in a furnace grade of only about 50%, which reduces its adaptability to large blast furnaces. Large blast furnaces also extend smelting time, leading to slag TiO2 content exceeding 22%, increased production of high-melting-point substances such as TiN and TiC from over-reduction reactions, and greater difficulty in separating slag and iron, further complicating operations. Smelting blast volume is over 30% higher than in conventional blast furnaces, resulting in larger gas volumes, more dust, higher energy consumption, and greater dust emissions at the tapping area. Developing environmental protection and waste heat utilization technologies is more challenging than for conventional blast furnaces. Furthermore, the unique physicochemical properties of iron concentrate from vanadium-titanium magnetite in the Panzhihua-Xichang region necessitate its specialized utilization. This iron concentrate requires the addition of imported ore, domestic high-titanium ore, and ordinary ore during blast furnace smelting, complicating the smelting process. (Pangang 1750m) 3 Although blast furnaces have made significant progress in recent years, with feed grades reaching approximately 50.5%–51.5% and utilization coefficients reaching 2.3 t / (m³), their overall performance has improved considerably. 3 The fuel ratio is around 550-580 kg / t, but due to the influence of raw material conditions, there is still a large gap compared with the advanced level. The stability of raw materials is insufficient, the stability of blast furnace is insufficient, the utilization coefficient is low, the content of harmful elements is high, and the pressure to reduce emissions is relatively large.

[0004] Therefore, there is a need in the existing technology for an operating method that ensures the stable and smooth operation of the blast furnace. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide an operating method for the stable and smooth operation of a large blast furnace for high-titanium vanadium-titanium magnetite. The method of this invention is suitable for the long-term stable and smooth operation of the blast furnace, realizes the innovation of the blast furnace intensified smelting technology for low-grade vanadium-titanium magnetite, and achieves the long-term stable and smooth operation and efficient smelting of a large blast furnace for high-titanium vanadium-titanium magnetite.

[0006] To achieve the above objectives, this invention provides an operating method for the stable and smooth operation of a large blast furnace for high-titanium vanadium-titanium magnetite ore smelting. The blast furnace uses coke for smelting, and the operating method includes:

[0007] S1 charging system: The throat area matrix is ​​divided into 12 rings, the ore landing points are distributed in rings 5 ​​to 10, the sum of edge coke and center coke is in the range of 70 to 80%, the charging matrix is ​​formed based on multiple historical charging data, the ore charging angle is set based on the material line length, and the blast furnace throat temperature is controlled at 60 to 120℃.

[0008] S2 air supply system: Under normal production conditions, a symmetrical air outlet layout with two air outlets of different areas is adopted. Under medium- to long-term abnormal production conditions, the air outlet area is adjusted based on the air volume.

[0009] S3 slag-forming regime: control the blast furnace slag viscosity to be less than 0.4 Pa·s, the basicity to be 1.03 to 1.1, the magnesium-aluminum ratio to be 0.6 to 0.72, and the Al2O3 content to be controlled at 9 to 13% by mass percentage;

[0010] S4 heat regime: Under normal production conditions, the molten iron temperature is 1448~1458℃; under short-term fluctuations, the molten iron temperature is 1455~1462℃; under medium- to long-term abnormal production conditions, the molten iron temperature is 1453~1467℃.

[0011] In some implementations, the symmetrical air outlet layout includes an air outlet area of ​​S1 = 0.2714 m². 2 S2 = 0.2793m 2 The length of the air vent is L = 530mm.

[0012] In some implementations, adjusting the air outlet area based on airflow during medium- to long-term abnormal production conditions includes:

[0013] Air volume ≤3000m 3 When the airflow rate is [value] / min, the vent area is adjusted to S = (0.20 ± 0.04) m². 2 ;

[0014] Air volume is 3000-3400 m³3 When the airflow rate is 0.23 ± 0.02 m³ / min, the vent area is adjusted to S = (0.23 ± 0.02) m³ / min. 2 ;

[0015] Air volume is 3400-3600 m³ / h 3 When the airflow rate is 0.24 m³ / min, the vent area is adjusted to S = (0.24 ± 0.01) m³ / min. 2 ;

[0016] Air volume is 3600-3800 m³ / h 3 When the airflow rate is [value] / min, the vent area is adjusted to S = (0.25 ± 0.01) m². 2 ;

[0017] Air volume is 3800-3900 m³ 3 When the airflow rate is 0.26 m³ / min, the vent area is adjusted to S = (0.26 ± 0.01) m². 2 .

[0018] In some implementations, the method for adjusting the vent area is as follows: S = 0.2714m 2 Add or subtract circles based on (Φ120mm×24).

[0019] In some implementations, production status is determined based on air volume, pressure-volume relationship, furnace temperature, and permeability index.

[0020] In some implementations, the feed line length is 1.7 to 2.0 meters, the ore feeding angle is 28.7 to 37.7°, and the coke feeding angle ranges from 21.7 to 39.7°.

[0021] In some implementations, the fabric matrix includes the fabric feeder tilt angle α, the number of ore fabric loops O, and the number of coke fabric loops C.

[0022] In some implementations, the feeder tilt angle α is divided into 6 levels -35.5°, 5 levels -34.5°, 4 levels -33°, 3 levels -31.5°, 2 levels -29.5° and 1 level -23°, corresponding to 0 to 3 feed rings for ore and 0 to 4 feed rings for coke.

[0023] In some implementations, forming a fabric matrix based on various historical fabric data includes:

[0024] A charging matrix is ​​formed by combining the historical charging data of its own blast furnace with that of other blast furnaces.

[0025] In some implementations, the operating method further includes: in the event of medium- to long-term abnormal production, first adjusting the air supply system, and then adjusting the fabric distribution system.

[0026] The present invention has at least the following beneficial technical effects:

[0027] This invention addresses the challenges of improving the performance of furnace burdens in large blast furnaces for smelting high-titanium vanadium-titanium magnetite, the difficulty in adjusting blast furnace intensified smelting operations, and the difficulty in recovering from fluctuations in blast furnace conditions. Through research on large-scale raw material quality stability control systems and improvement technologies, stable and efficient blast furnace smelting technologies for vanadium-titanium magnetite, and research on special blast furnace conditions, it proposes an operating system suitable for the long-term stable operation of blast furnaces. This results in a systematic intensified smelting technology that combines optimized operating systems, optimized furnace burden structure, and oxygen-enriched blast. It establishes a technological development direction for the intensified smelting of low-grade vanadium-titanium magnetite in ordinary blast furnaces, achieving a major innovation in the intensified smelting technology of low-grade vanadium-titanium magnetite, and realizing the long-term stable operation and efficient smelting of high-titanium vanadium-titanium magnetite in large blast furnaces. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of an embodiment of the operation method for stable and smooth operation of a large blast furnace for high-titanium vanadium-titanium magnetite ore provided by the present invention;

[0030] Figure 2 This is a schematic diagram of the laser-based material flow trajectory test provided by the present invention;

[0031] Figure 3 This is a schematic diagram of the equal-area matrix segmentation of the furnace throat provided by the present invention;

[0032] Figure 4 A schematic diagram illustrating the changing trends of utilization coefficient, air inlet area, and air outlet length provided by this invention;

[0033] Figure 5 A schematic diagram illustrating the changing trend of air outlet area and wind speed provided by the present invention;

[0034] Figure 6 A schematic diagram illustrating the comparison of slag composition provided by this invention;

[0035] Figure 7 A schematic diagram of the variation curve of Al2O3 slag in the No. 3 blast furnace provided by the present invention;

[0036] Figure 8 This is a schematic diagram of the thermal regime curve relationship provided by the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0038] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.

[0039] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] This invention provides a method for the stable and smooth operation of a large blast furnace for high-titanium vanadium-titanium magnetite ore, using a 1750m... 3 Blast furnace, which uses coke for smelting, includes the following operating methods:

[0041] Charging system: The throat area matrix is ​​divided into 12 rings, and the ore drop points are distributed in rings 5 ​​to 10. The sum of the proportions of edge coke and center coke is in the range of 70 to 80%. A charging matrix is ​​formed based on various historical charging data. The ore charging angle is set based on the material line length to control the blast furnace throat temperature to 60 to 120℃.

[0042] Air supply system: Under normal production conditions, a symmetrical air outlet layout with two air outlets of different areas is adopted. Under medium- to long-term abnormal production conditions, the air outlet area is adjusted based on the air volume.

[0043] Slag-forming regime: control the blast furnace slag viscosity to be less than 0.4 Pa·s, the basicity to be 1.03 to 1.1, the magnesium-aluminum ratio to be 0.6 to 0.72, and the Al2O3 content to be controlled at 9 to 13% by mass percentage;

[0044] Thermal regime: Under normal production conditions, the molten iron temperature is 1448-1458℃; under short-term fluctuations, the molten iron temperature is 1455-1462℃; under medium- to long-term abnormal production conditions, the molten iron temperature is 1453-1467℃.

[0045] Among them, during the furnace condition recovery process, a furnace condition recovery time of less than 10 days is judged as short-term fluctuation, a furnace condition recovery time of 10-30 days is judged as medium-term abnormality, and a furnace condition recovery time of more than 30 days is judged as long-term abnormality.

[0046] Optimizations to the fabric regime include:

[0047] Furthermore, when the material line length is 1.7 to 2.0 meters, the ore feeding angle is set to 28.7 to 37.7°, and the coke feeding angle is set to 21.7 to 39.7°.

[0048] Furthermore, the material distribution matrix includes the material distributor tilt angle α, the number of ore distribution loops O, and the number of coke distribution loops C. In some specific embodiments, the material distributor tilt angle α is divided into 6 levels (-35.5°), 5 levels (-34.5°), 4 levels (-33°), 3 levels (-31.5°), 2 levels (-29.5°), and 1 level (-23°), corresponding to 0 to 3 ore distribution loops O and 0 to 4 coke distribution loops C.

[0049] Furthermore, the formation of a feeding matrix based on various historical feeding data includes: forming a feeding matrix based on the historical feeding data of its own blast furnace and comparing it with the feeding systems of other blast furnaces, wherein the comparison with other blast furnace feeding systems is a comparison with the blast furnace feeding systems of advanced steel enterprises.

[0050] Optimizations to the air supply system include:

[0051] The air outlet area is S1 = 0.2714 m². 2 S2 = 0.2793m 2 A symmetrical air vent layout with an air vent length of L = 530mm.

[0052] Furthermore, under medium- to long-term abnormal production conditions, adjusting the air outlet area based on air volume includes:

[0053] Air volume ≤3000m 3 When the airflow rate is [value] / min, the vent area is adjusted to S = (0.20 ± 0.04) m². 2 ;

[0054] Air volume is 3000-3400 m³ 3 When the airflow rate is 0.23 ± 0.02 m³ / min, the vent area is adjusted to S = (0.23 ± 0.02) m³ / min. 2 ;

[0055] Air volume is 3400-3600 m³ / h 3 When the airflow rate is 0.24 m³ / min, the vent area is adjusted to S = (0.24 ± 0.01) m³ / min. 2 ;

[0056] Air volume is 3600-3800 m³ / h 3When the airflow rate is [value] / min, the vent area is adjusted to S = (0.25 ± 0.01) m². 2 ;

[0057] Air volume is 3800-3900 m³ 3 When the airflow rate is 0.26 m³ / min, the vent area is adjusted to S = (0.26 ± 0.01) m². 2 .

[0058] Furthermore, the method for adjusting the vent area is as follows: S = 0.2714m 2 Add or subtract circles based on (Φ120mm×24).

[0059] Furthermore, the production status is determined as normal or abnormal based on air volume, volume-pressure relationship, furnace temperature, and permeability index, where the volume-pressure relationship refers to the relationship between the cold air flow rate and the hot air pressure in the blast furnace.

[0060] Furthermore, the operating methods also include: in the event of abnormal production in the medium to long term, first adjust the air supply system, and then adjust the fabric distribution system.

[0061] The present invention will be further explained below with reference to specific embodiments.

[0062] In a specific embodiment of the present invention, the specific optimization method for the fabric regime is as follows:

[0063] like Figure 2 As shown, the laser method is used to test the blast furnace charge flow trajectory. The furnace throat is divided into an equal-area matrix as follows. Figure 3 As shown, the equal-area matrix of the furnace throat is divided into 12 rings. The radius of the material landing point for a material line of 1.7–2.0 m is shown in Table 1, and the corresponding angle values ​​for different landing points are shown in Table 2. Based on the results of laser-based material flow trajectory testing, in actual production, the material landing point should preferably be selected in the 5-10 ring area of ​​the furnace throat cross-section. With a material line of 1.9 m, the corresponding ore angle is 28.7–37.7°.

[0064] Table 1. Radius of the drop point of the 1.7-2.0m material line

[0065]

[0066] Table 2. Angle values ​​corresponding to different landing points

[0067]

[0068] Table 3 compares the blast furnace charging systems with those of advanced steel enterprises, Table 4 compares them with the company's own historical data, and Table 5 compares the charging systems before each furnace abnormality. By comparing advanced enterprises, the best historical levels, and the charging systems before each abnormality, it is concluded that: under high harmful element load conditions, 1750m... 3For blast furnace smelting of vanadium-titanium ore, the reasonable charging system during normal production should meet the following requirements:

[0069] ① The charging system should fully consider the differences in raw materials and equipment conditions. A reasonable charging system ensures sufficient central airflow while taking into account appropriate edge airflow.

[0070] ② Xichang Steel & Vanadium 1750m 3 The blast furnace throat temperature should be controlled between 70-120℃, with a lower limit of 60℃. Excessive pressing of the edge at a large angle or at the same angle as the ore and coke may improve indicators in the short term, but it is not conducive to long-term stability.

[0071] ③ When the ore drop point is distributed in the 5-10 range and the sum of the proportions of edge coke and center coke is in the range of 70-80%, it is more conducive to the blast furnace to obtain long-term stable and low-consumption technical and economic indicators.

[0072] Table 3. Comparison with advanced steel enterprises' blast furnace charging systems

[0073]

[0074] Table 4. Comparison with its own historical data

[0075]

[0076] Table 5. Comparison of material preparation with previous furnace condition abnormalities

[0077]

[0078] (2) Optimization of air supply system

[0079] The trends of blast furnace utilization coefficient with air inlet area and tuyere length are as follows: Figure 4 As shown, the changing trends of air outlet area and wind speed are as follows: Figure 5 As shown in Table 6, the statistics of air outlet area and layout are presented. Reasonable air supply parameters are derived from this.

[0080] ① Normal Production: Through correlation analysis of tuyere diameter, combination, tuyere length and furnace condition, it was determined that normal production adopts S = 0.2714 and 0.2793m. 2 A symmetrical tuyere layout with L=530mm is more conducive to long-term furnace stability; when raw material conditions do not allow for the use of long tuyeres, small tuyeres should be selected. Currently, blast furnaces are all at S=0.2714m. 2 Add a ring to the base (Φ120mm×24).

[0081] ② Recovery from Special Furnace Conditions: Analysis of past recovery processes for special furnace conditions reveals that: short-term planned shutdowns can maintain unchanged tuyere parameters; for long-term planned shutdowns or unplanned emergency shutdowns, blocking the tuyeres is more conducive to restoring airflow. Shutdowns of less than 4 hours are considered short-term shutdowns, and shutdowns of 4 hours or more are considered long-term shutdowns; for furnaces with persistently abnormal conditions, a shutdown should be decisively implemented and the tuyere area adjusted, where: airflow ≤ 3000m³ 3 When the airflow rate is [value] / min, the vent area should be S = (0.20 ± 0.04) m². 2 Air volume 3000-3400m³ 3 When the speed is 0.23 ± 0.02 m / min, S = (0.23 ± 0.02) m 2 Air volume 3400-3600m³ 3 When the speed is 0.24 ± 0.01 m / min, S = (0.24 ± 0.01) m 2 Air volume 3600-3800m³ 3 When the speed is 0.25 ± 0.01 m / min, S = (0.25 ± 0.01) m 2 Air volume 3800-3900m³ 3 When the speed is 0.26 ± 0.01 m / min, S = (0.26 ± 0.01) m 2 .

[0082] Table 6. Statistics on Air Outlet Area and Layout

[0083]

[0084] (3) Optimization of slag formation and thermal regime

[0085] Theoretical research was conducted on the five-element blast furnace slag system for vanadium-titanium magnetite. The viscosity of blast furnace slag is generally controlled below 0.4 Pa·s. When R2 in vanadium-titanium ore smelting is around 1.10, an Al2O3 content of 9–13% is suitable. If the Al2O3 content increases, the smelting operation will become difficult, specifically:

[0086] (1) The slag has a high melting point and the permeability of the softening zone is reduced, which manifests as high wind pressure and difficulty in blowing through the center;

[0087] (2) It is more likely to cause the hearth to stick together. When the (Al2O3) rises, the melting point of the slag rises, which requires the hearth to have a higher smelting temperature. This is incompatible with the thermal regime of the hearth when smelting high (TiO2) slag. Therefore, it leads to the sticking of high melting point slag phases such as (Al2O3) when the furnace temperature is low, and the deposition of Ti(N,C) when the furnace temperature is high, further narrowing the operating window of vanadium-titanium ore smelting.

[0088] (3) Reduced slag alkali removal and desulfurization capacity. The decreased fluidity of slag and iron and the deterioration of reaction kinetics are the main reasons for the reduced slag alkali removal and desulfurization capacity.

[0089] Slag composition, for example Figure 6 As shown, the variation curves of Al2O3 in the blast furnace slag of the No. 3 blast furnace are as follows: Figure 7 As shown, Xichang Steel & Vanadium experienced frequent slag (Al2O3) concentrations exceeding 14.0% since June 2015, with the longest duration and fastest increase occurring between December 2016 and April 2018, causing fluctuations in blast furnace conditions. The limiting effect of [Ti] on furnace condition recovery is as follows... Figure 8 As shown, where, Figure 8 -(a) The relationship curve between molten iron temperature and [Ti]: Under normal production conditions, the molten iron temperature is 1448~1458℃; under short-term fluctuation conditions, the molten iron temperature is 1455~1462℃; under medium- and long-term abnormal production conditions, the molten iron temperature is 1453~1467℃. Figure 8 -(b) Selection of furnace condition recovery and thermal regime: Based on the influence of each component on slag properties and the interaction of each component, reasonable slag-forming regimes and thermal regimes for different stages of normal production and special furnace condition recovery are obtained, as shown in Table 7.

[0090] Table 7. Reasonable slag formation and thermal regimes

[0091]

[0092] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0093] It should be understood that, as used herein, the singular form “a” is intended to include the plural form as well, unless the context clearly supports an exception. It should also be understood that, as used herein, “and / or” refers to any and all possible combinations of one or more of the associated listed items.

[0094] The embodiment numbers disclosed in the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0095] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method for the stable and smooth operation of a large blast furnace for high-titanium vanadium-titanium magnetite ore, characterized in that, The blast furnace uses coke for smelting, and the operating methods include: Charging system: The furnace throat is divided into 12 rings with equal area matrix. The ore landing points are distributed in rings 5 ​​to 10. The sum of the proportion of edge coke and center coke is in the range of 70 to 80%. The charging matrix is ​​formed based on various historical charging data. The ore and coke charging angles are set based on the material line length, and the blast furnace throat temperature is controlled at 60 to 120℃. Air supply system: Under normal production conditions, a symmetrical air outlet layout with two air outlets of different areas is adopted. Under medium- to long-term abnormal production conditions, the air outlet area is adjusted based on the air volume. Slag-forming regime: control the blast furnace slag viscosity to be less than 0.4 Pa·s, the basicity to be 1.03~1.1, the magnesium-aluminum ratio to be 0.6~0.72, and the Al2O3 content to be controlled at 9~13% by mass percentage; Heat treatment: Under normal production conditions, the molten iron temperature is controlled at 1448~1458℃; under short-term fluctuations, the molten iron temperature is controlled at 1455~1462℃; under medium- to long-term abnormal production conditions, the molten iron temperature is controlled at 1453~1467℃. In the case of medium- to long-term abnormal production, adjusting the air outlet area based on air volume includes: Air volume ≤3000m 3 When the airflow rate is 0.20 ± 0.04 m³ / min, the vent area is adjusted to S = (0.20 ± 0.04) m³ / min. 2 ; 3000m 3 / min<Airflow≤3400 m 3 When the airflow rate is 0.23 ± 0.02 m³ / min, the vent area is adjusted to S = (0.23 ± 0.02) m³ / min. 2 ; 3400 m 3 / min<Airflow≤3600 m 3 When the airflow rate is 0.24 ± 0.01 m³ / min, the vent area is adjusted to S = (0.24 ± 0.01) m³ / min. 2 ; 3600 m 3 / min<Airflow≤3800 m 3 When the airflow rate is 0.25 m / min, the vent area is adjusted to S = (0.25 ± 0.01) m. 2 ; 3800 m 3 / min<Airflow≤3900 m 3 When the airflow rate is 0.26 ± 0.01 m³ / min, the vent area is adjusted to S = (0.26 ± 0.01) m³. 2 ; The feeder tilt angle α is divided into 6 levels of -35.5°, 5 levels of -34.5°, 4 levels of -33°, 3 levels of -31.5°, 2 levels of -29.5° and 1 level of -23°, corresponding to 0 to 3 feed rings for ore and 0 to 4 feed rings for coke.

2. The method for stable and smooth operation of a large blast furnace for high-titanium vanadium-titanium magnetite ore as described in claim 1, characterized in that, The symmetrical air outlet layout includes an air outlet area of ​​S1 = 0.2714 m². 2 S2=0.2793m 2 The length of the air vent is L=530mm.

3. The method for stable and smooth operation of a large blast furnace for high-titanium vanadium-titanium magnetite ore as described in claim 1, characterized in that, The method for adjusting the air vent area is as follows: S=0.2714m 2 Based on this, add or subtract rings from the air vents.

4. The method for stable and smooth operation of a large blast furnace for high-titanium vanadium-titanium magnetite ore as described in claim 1, characterized in that, The production status is determined based on air volume, pressure-volume relationship, furnace temperature, and permeability index.

5. The method for stable and smooth operation of a large blast furnace for high-titanium vanadium-titanium magnetite ore as described in claim 1, characterized in that, The material line length is 1.7~2.0 meters, the ore feeding angle is 28.7~37.7°, and the coke feeding angle ranges from 21.7~39.7°.

6. The method for stable and smooth operation of a large blast furnace for high-titanium vanadium-titanium magnetite ore as described in claim 1, characterized in that, The fabric matrix includes the fabric feeder tilt angle α, the number of ore fabric loops O, and the number of coke fabric loops C.

7. The method for stable and smooth operation of a large blast furnace for high-titanium vanadium-titanium magnetite ore as described in claim 6, characterized in that, A fabric matrix is ​​formed based on various historical fabric data, including: A charging matrix is ​​formed by combining the historical charging data of its own blast furnace with that of other blast furnaces.

8. The method for stable and smooth operation of a large blast furnace for high-titanium vanadium-titanium magnetite ore as described in claim 1, characterized in that, The operating method also includes: in the event of abnormal production in the medium to long term, first adjust the air supply system, and then adjust the fabric distribution system.

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