Operating method for stable and smooth operation of large blast furnace for high-titanium vanadium titano-magnetite

Abstract

Disclosed in the present invention is an operating method for the stable and smooth operation of a large blast furnace for high-titanium vanadium titano-magnetite, comprising: a distribution system: dividing a furnace throat into twelve annuluses of equal area in an matrix, such that the points of fall of ore are distributed from the 5th to 10th annuluses and the sum of the proportions of edge coke and central coke is within the range of 70-80%, forming a distribution matrix on the basis of various historical distribution data, setting an ore distribution angle on the basis of a stock line length, and controlling a blast furnace throat temperature to be 60-120℃; a blast system: under a normal production condition, using a symmetrical arrangement of two tuyeres of different areas and, under the condition of medium- and long-term abnormal production, adjusting the area of the tuyeres on the basis of a blast volume; and a slagging system and a heating system. The present invention solves the difficult problems, such as great difficulty in improving furnace charge smelting properties, great difficulty in adjusting intensified smelting operations, and great difficulty in recovering fluctuating furnace conditions, of large blast furnaces for high-titanium vanadium titano-magnetite, thereby achieving the long-term stable and smooth operation of the large blast furnaces for high-titanium vanadium titano-magnetite and maintaining the smooth highly-effective smelting operation thereof.

Description

A stable and forward operation method for a large blast furnace with high-titanium vanadium-titanium magnetite

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on August 11, 2023, with application number 202311014875.2 and invention name “A method for stable and forward operation of a large blast furnace of high-titanium vanadium-titanium magnetite”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of blast furnace smelting, in particular to a method for stably and smoothly operating a large-scale blast furnace of high-titanium vanadium-titanium magnetite. Background Art

[0003] my country's vanadium-titanium magnetite resources are primarily concentrated in the Panzhihua-Xiangxi region, accounting for approximately 20% of the country's iron ore reserves. This high-titanium vanadium-titanium magnetite ore requires significant smelting technology differences from conventional ore. During the smelting process, problems such as sticky and foamy slag, indistinguishable slag and iron, poor desulfurization, high iron loss, and hearth accumulation often occur, making blast furnace smelting extremely challenging. Over the past 50 years since the Panzhihua Iron and Steel blast furnace began operation, through years of technical research and continuous improvement in feed technology, equipment, and smelting techniques, the implementation of technical measures such as high-basicity sintering, optimized charge structure with the addition of all-vanadium-titanium pellets, and enhanced smelting through oxygen-enriched high-pressure coal injection has significantly improved the blast furnace's key technical and economic indicators, reaching the advanced level of conventional blast furnace smelting. The demand for high-quality development in the new era has put forward new requirements for the green and efficient comprehensive utilization of vanadium-titanium magnetite resources, aiming to enhance the market competitiveness of the entire industry chain and all factors involved.

[0004] Xichang Steel and Vanadium Block 3, 1750m 3 The successful commissioning of the first-class blast furnace has made it the second largest blast furnace in the world for smelting high-titanium vanadium-titanium magnetite (the largest blast furnace is Panzhihua Vanadium New Third Blast Furnace with a capacity of 2000m 3 ). After the blast furnace is enlarged, the quality of raw materials is required to be high and the operation is difficult. The low-temperature reduction of high-titanium sintered ore is seriously pulverized, and the grade entering the furnace is only about 50%, which makes it less adaptable to large blast furnaces. The smelting time of large blast furnaces is prolonged, the TiO2 content in the slag is as high as more than 22%, and the high-melting-point substances such as TiN and TiC produced by the over-reduction reaction increase. It is more difficult to separate the slag and iron, and the operation is more difficult. The smelting air volume is more than 30% more than that of ordinary ore blast furnaces, so the amount of coal gas is large, the dust is high, the energy consumption is high, and the amount of smoke and dust in the iron-making yard is large. The development of environmental protection and waste heat utilization technology is more difficult than that of ordinary ore blast furnaces. On the other hand, the special physical and chemical properties of the iron concentrate in the vanadium-titanium magnetite ore in Panzhihua area determine the particularity of its utilization. The iron concentrate needs to be mixed with imported ore, national high-temperature ore and ordinary ore during the blast furnace smelting process, which makes the smelting process complicated. Panzhihua Iron and Steel 1750m 3Although blast furnaces have made significant progress in recent years, the feed grade has reached about 50.5% to 51.5%, and the utilization coefficient has reached 2.3t / (m 3 ·d), with a fuel ratio of around 550-580 kg / t. However, due to the influence of raw and fuel conditions, there is still a large gap with the advanced level. The raw and fuel stability is insufficient, the blast furnace stability is insufficient, the utilization coefficient is low, the content of harmful elements is high, and the pressure of emission reduction is relatively large.

[0005] Therefore, a method for ensuring stable and smooth operation of the blast furnace is needed in the prior art.

[0006] Summary of the Invention

[0007] In view of this, the purpose of the embodiment of the present invention is to propose an operating method for the stable and smooth operation of a large blast furnace with high titanium vanadium titanium magnetite. The method of the present invention is suitable for the long-term stable and smooth operation of the blast furnace, realizes the innovation of the enhanced smelting technology of low-grade vanadium titanium magnetite blast furnace, and realizes the long-term stable and smooth operation and efficient smelting of high titanium vanadium titanium magnetite in a large blast furnace.

[0008] Based on the above purpose, the embodiment of the present invention provides a method for operating a large-scale blast furnace with high titanium vanadium-titanium magnetite in a stable and forward manner, wherein the blast furnace adopts coke smelting, and the operating method comprises:

[0009] S1 charging system: The furnace throat matrix of equal area is divided into 12 rings, with ore placement distributed in rings 5 ​​to 10. The sum of the coke percentage at the edge and center is within the range of 70 to 80%. The charging matrix is ​​formed based on various historical charging data, and the ore charging angle is set based on the charging line length. The blast furnace throat temperature is controlled at 60 to 120°C.

[0010] S2 air supply system: Under normal production conditions, a symmetrical air outlet layout with two air outlets is adopted, and the areas of the two air outlets are different. In the case of medium- and long-term abnormal production, the air outlet area is adjusted based on the air volume;

[0011] S3 slag making system: control the blast furnace slag viscosity to less than 0.4 Pa·s, the basicity to 1.03-1.1, the magnesium-aluminum ratio to 0.6-0.72, and the Al2O3 content to 9-13% by mass;

[0012] S4 thermal system: Under normal production conditions, the molten iron temperature is 1448-1458°C; under short-term fluctuation conditions, the molten iron temperature is 1455-1462°C; under medium- and long-term abnormal production conditions, the molten iron temperature is 1453-1467°C.

[0013] In some embodiments, the symmetrical tuyere layout includes: the tuyere area is S1 = 0.2714m 2 、S2=0.2793m 2 , the length of the air outlet is L=530mm.

[0014] In some embodiments, in the case of medium- to long-term abnormal production, adjusting the tuyere area based on the air volume includes:

[0015] Air volume ≤3000m 3 / min, the air outlet area is adjusted to S = (0.20 ± 0.04) m 2 ;

[0016] Air volume is 3000~3400m 3 / min, the air outlet area is adjusted to S = (0.23 ± 0.02) m 2 ;

[0017] Air volume is 3400~3600m 3 / min, the air outlet area is adjusted to S = (0.24 ± 0.01) m 2 ;

[0018] Air volume is 3600~3800m 3 / min, the air outlet area is adjusted to S = (0.25 ± 0.01) m 2 ;

[0019] Air volume is 3800~3900m 3 / min, the air outlet area is adjusted to S = (0.26 ± 0.01) m 2 .

[0020] In some embodiments, the method for adjusting the tuyere area is to adjust the tuyere area at S=0.2714m 2 Add or subtract circles based on (Φ120mm×24).

[0021] In some embodiments, the production status is determined based on the air volume, the relationship between volume and pressure, the furnace temperature, and the air permeability index.

[0022] In some embodiments, the feed line length is 1.7 to 2.0 meters, the ore distribution angle is 28.7 to 37.7 degrees, and the coke distribution angle ranges from 21.7 to 39.7 degrees.

[0023] In some embodiments, the distribution matrix includes a distributor inclination angle α, a number of ore distribution circles O, and a number of coke distribution circles C.

[0024] In some embodiments, the distributor inclination angle α is divided into 6 gears -35.5°, 5 gears -34.5°, 4 gears -33°, 3 gears -31.5°, 2 gears -29.5° and 1 gear -23°, and the corresponding ore distribution circle number O is 0 to 3 circles, and the coke distribution circle number C is 0 to 4 circles.

[0025] In some embodiments, forming a cloth matrix based on a plurality of historical cloth data includes:

[0026] Based on the historical charging data of its own blast furnace and comparing with other blast furnace charging systems, a charging matrix is ​​formed.

[0027] In some embodiments, the operating method further includes: in the case of medium- to long-term abnormal production, first adjusting the air supply system and then adjusting the material distribution system.

[0028] The present invention has at least the following beneficial technical effects:

[0029] The present invention aims at the difficulties of improving the performance of large-scale blast furnace smelting charge of high-titanium vanadium-titanium magnetite, adjusting the operation of intensified blast furnace smelting, and recovering from fluctuations in blast furnace conditions. By carrying out large-scale raw material quality stabilization control system and improvement technology, research on stable and efficient smelting technology of blast furnace smelting vanadium-titanium magnetite, and research on special blast furnace conditions, an operating system suitable for long-term stable and smooth operation of blast furnaces is proposed, and a system intensified smelting technology with operation system optimization as the core, charge structure optimization and oxygen-enriched blast is formed. The technical development direction of the intensified smelting of low-grade vanadium-titanium magnetite in ordinary blast furnaces is constructed, and a major innovation of the intensified smelting technology of low-grade vanadium-titanium magnetite blast furnace is achieved, and the long-term stable and smooth operation and efficient smelting of high-titanium vanadium-titanium magnetite in large-scale blast furnaces is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying any creative work.

[0031] FIG1 is a schematic diagram of an embodiment of a method for stably and smoothly operating a large-scale blast furnace of high-titanium vanadium-titanium magnetite provided by the present invention;

[0032] FIG2 is a schematic diagram of a material flow trajectory test using a laser method according to the present invention;

[0033] FIG3 is a schematic diagram of a furnace throat equal area matrix segmentation according to the present invention;

[0034] FIG4 is a schematic diagram showing the changing trends of the utilization coefficient, the air inlet area, and the air outlet length provided by the present invention;

[0035] FIG5 is a schematic diagram of the change trend of the air outlet area and wind speed provided by the present invention;

[0036] FIG6 is a schematic diagram showing a comparison of slag compositions provided by the present invention;

[0037] FIG7 is a schematic diagram of a change curve of slag (Al2O3) of a third blast furnace provided by the present invention;

[0038] FIG8 is a schematic diagram of the thermal system curve relationship provided by the present invention. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0040] The terms "including," "having," and any variations thereof in the present specification, claims, and accompanying drawings are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the present specification, claims, and accompanying drawings are used to distinguish between different items, not to describe a particular order. "Multiple" means two or more, unless otherwise expressly specified.

[0041] Furthermore, references herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] The present invention provides a method for operating a large blast furnace with high titanium vanadium-titanium magnetite in a stable and forward manner, using a 1750m 3 Blast furnace, which uses coke for smelting, has the following operating methods:

[0043] Charging system: The furnace throat matrix of equal area is divided into 12 rings, with ore placement distributed in rings 5 ​​to 10. The sum of the coke percentage at the edge and center is within the range of 70 to 80%. A charging matrix is ​​formed based on various historical charging data, and the ore charging angle is set based on the charging line length. The blast furnace throat temperature is controlled at 60 to 120°C.

[0044] Air supply system: Under normal production conditions, a symmetrical layout of two air outlets with different areas is adopted. In the case of medium- and long-term abnormal production, the air outlet area is adjusted based on the air volume;

[0045] Slag making system: The viscosity of blast furnace slag is controlled to be less than 0.4 Pa·s, the basicity is 1.03-1.1, the magnesium-aluminum ratio is 0.6-0.72, and the Al2O3 content is controlled at 9-13% by mass;

[0046] Thermal system: Under normal production conditions, the molten iron temperature is 1448-1458°C; under short-term fluctuation conditions, the molten iron temperature is 1455-1462°C; under medium- and long-term abnormal production conditions, the molten iron temperature is 1453-1467°C.

[0047] Among them, during the furnace condition recovery process, a furnace condition recovery time of less than 10 days is judged as a short-term fluctuation, a furnace condition recovery time of 10-30 days is judged as a medium-term abnormality, and a furnace condition recovery time of more than 30 days is considered as a long-term abnormality.

[0048] Optimization of the fabric system includes:

[0049] Furthermore, when the feed 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 range is set to 21.7 to 39.7°.

[0050] Furthermore, the distribution matrix includes a distributor inclination angle α, a number of ore distribution circles O, and a number of coke distribution circles C. In some specific embodiments, the distributor inclination angle α is divided into 6 gears -35.5°, 5 gears -34.5°, 4 gears -33°, 3 gears -31.5°, 2 gears -29.5°, and 1 gear -23°, and the corresponding ore distribution circle number O is 0 to 3 circles, and the coke distribution circle number C is 0 to 4 circles.

[0051] Furthermore, forming a charge distribution matrix based on a plurality of historical charge distribution data includes: forming a charge distribution matrix based on the historical charge distribution data of the own blast furnace and comparing with other blast furnace charge distribution systems, wherein the comparison with other blast furnace charge distribution systems is a comparison with blast furnace charge distribution systems of advanced steel enterprises.

[0052] Optimization of the air supply system includes:

[0053] The air outlet area is S1 = 0.2714m 2 、S2=0.2793m 2 , symmetrical tuyere layout with tuyere length L=530mm.

[0054] Furthermore, in the case of medium- to long-term abnormal production, adjusting the tuyere area based on the air volume includes:

[0055] Air volume ≤3000m 3 / min, the air outlet area is adjusted to S = (0.20 ± 0.04) m 2 ;

[0056] Air volume is 3000~3400m 3 / min, the air outlet area is adjusted to S = (0.23 ± 0.02) m 2 ;

[0057] Air volume is 3400~3600m 3 / min, the air outlet area is adjusted to S = (0.24 ± 0.01) m 2 ;

[0058] Air volume is 3600~3800m 3 / min, the air outlet area is adjusted to S = (0.25 ± 0.01) m 2 ;

[0059] Air volume is 3800~3900m 3 / min, the air outlet area is adjusted to S = (0.26 ± 0.01) m 2 .

[0060] Furthermore, the method for adjusting the tuyere area is to adjust the tuyere area at S = 0.2714m 2 Add or subtract circles based on (Φ120mm×24).

[0061] Furthermore, the production situation is judged as normal or abnormal based on the air volume, the quantity-pressure relationship, the furnace temperature and the permeability index, wherein the quantity-pressure relationship is the relationship between the cold air flow rate and the hot air pressure of the blast furnace.

[0062] Furthermore, the operating method also includes: in the case of medium- to long-term abnormal production, first adjusting the air supply system and then adjusting the material distribution system.

[0063] The present invention will be further explained below based on specific embodiments.

[0064] In a specific embodiment of the present invention, the specific optimization method for the material distribution system is:

[0065] As shown in Figure 2, the laser method was used to test the blast furnace material flow trajectory. The equal-area matrix of the furnace throat was segmented into 12 circular rings, as shown in Figure 3. The radius of the material line landing point, ranging from 1.7 to 2.0 meters, is shown in Table 1, and the corresponding angle values ​​for different landing points are shown in Table 2. Based on the results of the laser method's material flow trajectory testing, in actual production, the material landing point should be selected within the 5-10 ring area of ​​the furnace throat cross-section. Based on a material line of 1.9 meters, the corresponding ore angle is 28.7 to 37.7°.

[0066] Table 1.1.7-2.0m material line landing point distance radius

[0067] Table 2. Angle values ​​corresponding to different landing points

[0068] The comparison of blast furnace charging system with advanced steel enterprises is shown in Table 3, the comparison with its own historical data is shown in Table 4, and the comparison of charging system before all previous abnormalities is shown in Table 5. By comparing with advanced enterprises, comparing the best historical levels and charging system before all previous abnormalities, it is concluded that under the condition of high harmful element load, 1750m 3 When smelting vanadium-titanium ore in a blast furnace, the reasonable charging system for normal production should meet the following requirements:

[0069] ① The formulation of the loading system should fully consider the differences in raw materials and equipment conditions. A reasonable loading system should ensure sufficient central airflow and appropriate edge airflow.

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

[0071] ③ The ore landing points are distributed in the 5-10 grades, and the sum of the edge coke and center coke is within the range of 70-80%, which is more conducive to the blast furnace to obtain long-term stable and low-consumption technical and economic indicators.

[0072] Table 3. Comparison of blast furnace charge distribution system with advanced steel enterprises

[0073] Table 4. Comparison with own historical data

[0074] Table 5. Comparison of material system before abnormal furnace conditions

[0075] (2) Optimization of air supply system

[0076] The changing trends of blast furnace utilization coefficient, air inlet area and tuyere length are shown in Figure 4, the changing trends of tuyere area and wind speed are shown in Figure 5, and the statistics of tuyere area and layout data are shown in Table 6. The reasonable air supply parameters are obtained:

[0077] The changing trends of blast furnace utilization coefficient, air inlet area and tuyere length are shown in Figure 4, the changing trends of tuyere area and wind speed are shown in Figure 5, and the statistics of tuyere area and layout data are shown in Table 6. The reasonable air supply parameters are obtained:

[0078] ①Normal production: Through the correlation analysis of tuyere diameter, combination, tuyere length and furnace condition, it is concluded that S=0.2714、0.2793m 2 The symmetrical tuyere layout with L=530mm is more conducive to the long-term stability of the furnace condition; when the raw material conditions do not allow the use of long tuyere, small tuyere should be selected. 2 (Φ120mm×24) Add a circle on the basis.

[0079] ② Special furnace condition recovery: Through the analysis of the recovery process of special furnace conditions, it is concluded that short-term planned wind-down can maintain the tuyere parameters unchanged; long-term planned wind-down or unplanned emergency wind-down, blocking the tuyere is more conducive to the recovery of air volume, less than 4 hours is a short-term wind-down, and more than or equal to 4 hours is a long-term wind-down; long-term abnormal furnace conditions should be decisively shut down and the tuyere area should be adjusted, among which: air volume ≤ 3000m 3 / min, the air outlet area should be S=(0.20±0.04)m 2 ; Air volume 3000-3400m 3 / min, S=(0.23±0.02)m 2 ; Air volume 3400-3600m 3 / min, S=(0.24±0.01)m 2 ; Air volume 3600-3800m 3 / min, S=(0.25±0.01)m 2 ; Air volume 3800-3900m 3 / min, S=(0.26±0.01)m 2 .

[0080] Table 6. Statistics of air outlet area and layout data

[0081] (3) Optimization of slag making system and thermal system

[0082] Theoretical research has been conducted on the five-element slag system of vanadium-titanium magnetite blast furnace. The viscosity of blast furnace slag is generally controlled below 0.4 Pa·s. When R2 is around 1.10 in vanadium-titanium ore smelting, the (Al2O3) content is preferably between 9% and 13%. If the (Al2O3) content increases, the smelting operation will become difficult. Specifically:

[0083] (1) The melting point of slag is high, and the air and liquid permeability of the soft melting zone is reduced, which is manifested as high wind pressure and difficulty in blowing through the center;

[0084] (2) It is more likely to cause hearth adhesion. When (Al2O3) increases, the melting point of the slag increases, which requires the hearth to have a higher smelting temperature, which conflicts with the thermal system of the hearth for smelting high (TiO2) slag. Therefore, when the furnace temperature is low, (Al2O3) and other high-melting-point slags will adhere, and when the furnace temperature is high, Ti (N, C) will be deposited, further narrowing the vanadium-titanium ore smelting operation window;

[0085] (3) Reduced slag alkali removal and desulfurization capabilities. The deterioration of slag iron fluidity and reaction kinetics is the main reason for the reduction in slag alkali removal and desulfurization capabilities.

[0086] A comparison of slag composition is shown in Figure 6, and the slag (Al2O3) variation curves for the three blast furnaces are shown in Figure 7. Since June 2015, the slag (Al2O3) content at Xichang Steel & Vanadium has frequently exceeded 14.0%, with the longest duration and fastest increase from December 2016 to April 2018, causing fluctuations in blast furnace conditions. The limiting effect of [Ti] on blast furnace condition recovery is shown in Figure 8. Figure 8-(a) shows the relationship between molten iron temperature and [Ti]. Under normal production conditions, the molten iron temperature is 1448-1458°C; under short-term fluctuations, the molten iron temperature is 1455-1462°C; and under medium- to long-term abnormal production conditions, the molten iron temperature is 1453-1467°C. Figure 8-(b) shows the selection of blast furnace condition recovery and thermal regimes. Based on the influence of various components on slag properties and their interactions, appropriate slag-making and thermal regimes for different stages of normal production and special blast furnace condition recovery are determined, as shown in Table 7.

[0087] Table 7. Reasonable slag making system and thermal system

[0088] The above are exemplary embodiments disclosed in the present invention, but it should be noted that various changes and modifications may be made without departing from the scope of the embodiments disclosed in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order. In addition, although the elements disclosed in the embodiments of the present invention may be described or required in individual form, they may also be understood as multiple unless expressly limited to the singular.

[0089] It should be understood that, as used herein, the singular forms "a" and "an" are intended to include the plural forms as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" is intended to include any and all possible combinations of one or more of the associated listed items.

[0090] The serial numbers of the embodiments disclosed in the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0091] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples. Within the spirit of the embodiments of the present invention, the technical features of the above embodiments or different embodiments may be combined, and there are many other variations of different aspects of the above embodiments of the present invention, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the scope of protection of the embodiments of the present invention.

Claims

1. A method for operating a large blast furnace with high-titanium vanadium-titanium magnetite in a stable and forward manner, characterized in that: The blast furnace uses coke for smelting, and the operation methods include: Charging system: The furnace throat matrix of equal area is divided into 12 circular rings, the ore landing points are distributed in the 5th to 10th rings, the sum of the edge coke and center coke proportions is in the range of 70% to 80%, and the charging matrix is ​​formed based on a variety of historical charging data. The ore and coke charging angles are set based on the length of the charging line, and the blast furnace throat temperature is controlled at 60-120℃; Air supply system: Under normal production conditions, a symmetrical air outlet layout with two air outlets is adopted, and the areas of the two air outlets are different. Under medium- and long-term abnormal production conditions, the air outlet area is adjusted based on the air volume; Slag making system: control the viscosity of blast furnace slag to less than 0.4 Pa·s, the basicity to 1.03-1.1, the magnesium-aluminum ratio to 0.6-0.72, and the Al2O3 content to 9-13% by mass percentage; Thermal system: Under normal production conditions, the molten iron temperature is controlled at 1448-1458°C; under short-term fluctuations, the molten iron temperature is controlled at 1455-1462°C; under medium- and long-term abnormal production conditions, the molten iron temperature is controlled at 1453-1467°C.

2. The stable and forward operation method of a large blast furnace of high-titanium vanadium-titanium magnetite according to claim 1 is characterized in that: The symmetrical tuyere layout includes: tuyere area S1 = 0.2714m 2 、S2=0.2793m 2 , the length of the air outlet is L=530mm.

3. The stable and forward operation method of a large blast furnace of high-titanium vanadium-titanium magnetite according to claim 1 is characterized in that: In the case of medium- and long-term abnormal production, the tuyere area is adjusted based on the air volume, including: Air volume ≤3000m 3 / min, the air outlet area is adjusted to S = (0.20 ± 0.04) m 2 ; Air volume: 3000~3400m 3 / min, the air outlet area is adjusted to S = (0.23 ± 0.02) m 2 ; Air volume: 3400~3600m 3 / min, the air outlet area is adjusted to S = (0.24 ± 0.01) m 2 ; Air volume: 3600~3800m 3 / min, the air outlet area is adjusted to S = (0.25 ± 0.01) m 2 ; Air volume: 3800~3900m 3 / min, the air outlet area is adjusted to S = (0.26 ± 0.01) m 2 .

4. The stable and forward operation method of a large-scale blast furnace of high-titanium vanadium-titanium magnetite according to claim 3 is characterized in that: The method of adjusting the air outlet area is to adjust the air outlet area at S = 0.2714m 2 (Φ120mm×24) add or subtract circles on the basis.

5. The stable and forward operation method of a large blast furnace of high-titanium vanadium-titanium magnetite according to claim 1 is characterized in that: The production situation is judged based on the air volume, quantity-pressure relationship, furnace temperature and permeability index.

6. The stable and forward operation method of a large-scale blast furnace of high-titanium vanadium-titanium magnetite according to claim 1 is characterized in that: The length of the material line 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°.

7. The stable and forward operation method of a large-scale blast furnace of high-titanium vanadium-titanium magnetite according to claim 1 is characterized in that: The distribution matrix includes the distributor inclination angle α, the number of ore distribution circles O and the number of coke distribution circles C.

8. The method for operating a large-scale blast furnace with high-titanium vanadium-titanium magnetite in a stable and forward manner according to claim 7, characterized in that: The inclination angle α of the distributor is divided into 6 gears -35.5°, 5 gears -34.5°, 4 gears -33°, 3 gears -31.5°, 2 gears -29.5° and 1 gear -23°. The corresponding ore distribution circle number O is 0 to 3 circles, and the coke distribution circle number C is 0 to 4 circles.

9. The stable and forward operation method of a large-scale blast furnace of high-titanium vanadium-titanium magnetite according to claim 7 is characterized in that: The fabric matrix is ​​formed based on various historical fabric data including: Based on the historical charging data of its own blast furnace and comparing with other blast furnace charging systems, a charging matrix is ​​formed.

10. The stable and forward operation method of a large-scale blast furnace of high-titanium vanadium-titanium magnetite according to claim 1 is characterized in that: The operating method also includes: in the case of medium- to long-term abnormal production, first adjusting the air supply system and then adjusting the material distribution system.

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