Emergency treatment method for tilting fault of blast furnace distribution chute

Abstract

The invention relates to an emergency treatment method for a tilting fault of a blast furnace distribution chute, which specifically comprises the following steps of: 1) when the chute rotates normally and does not tilt, determining and calculating a basic inclination angle of single-ring distribution according to a current stock line and distribution inclination angles of different stock lines determined by blowing in; 2) calculating a coke single-ring weighted material distribution inclination angle; 3) calculating an ore single-ring weighted material distribution inclination angle; 4) calculating an ore coke distribution inclination angle, and taking a golden section point on the ore coke angle difference as a comprehensive ore coke distribution inclination angle; and (5) the coke distribution inclination angle obtained in the step (4) is the single-ring feeding distribution inclination angle of the blast furnace when the chute tilts and breaks down. And (6) manual adjustment is carried out. By establishing the calculation model of the inclination angle of the single-ring distribution chute of the blast furnace, the current distribution inclination angle can be quickly determined under the condition of a chute tilting fault, the negative influence on reduction of single-ring distribution is obvious, favorable conditions are created for blast furnace maintenance, and stable and smooth operation of the blast furnace is facilitated.

Description

Technical Field

[0001] The invention belongs to the field of iron and steel metallurgy, relates to a blast furnace top material distribution technology, and in particular to an emergency treatment method for a blast furnace material distribution chute tilting failure. Background Art

[0002] The chute is the key equipment for realizing flexible charging of the bell-less blast furnace roof. The movement of the chute itself includes two modes: rotation and tilting. Rotation can realize charging of the chute in the circumferential direction, and tilting can realize charging of the chute in the radial direction. Under the combination of these two operation modes, the chute can realize single-ring charging, multi-ring charging, spiral charging, single-point charging and fan-shaped charging. During normal production, the blast furnace generally adopts a multi-ring spiral charging mode. This charging mode requires the chute to combine the two operation modes of rotation and tilting. If the blast furnace chute does not move due to a tilting failure, but rotates normally, the blast furnace needs to manually adjust the chute inclination angle to a certain single-ring charging angle to maintain the normal operation of the blast furnace as much as possible and gain more time for maintenance operations. To determine the tilting of the single-ring charging of the blast furnace, it is necessary to comprehensively consider the charging situation of the blast furnace at the coke level and minimize the adverse effects of the single-ring charging on the smooth operation of the blast furnace. If the determined single-ring burden distribution angle is too large, it will easily cause the edge to be too heavy and the gas utilization effect will be poor; if the determined single-ring burden distribution angle is too small, it will easily increase the center weight, worsen the blast furnace permeability, and affect the smooth operation of the blast furnace. Therefore, scientifically and reasonably calculating the blast furnace single-ring burden distribution angle is very important to reduce the adverse effects of the blast furnace single-ring burden distribution. Summary of the invention

[0003] The purpose of the present invention is to provide an emergency treatment method for a blast furnace charging chute tilting failure. By establishing a blast furnace single-ring charging model, in the event of a blast furnace chute tilting failure, the process single-ring charging angle can be quickly determined and manually adjusted to minimize the negative impact of the single-ring charging, maintain the stable and smooth operation of the blast furnace, and reduce the fluctuation of the furnace condition.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] An emergency treatment method for a blast furnace distribution chute tilting failure specifically comprises the following method steps:

[0006] 1) When the chute rotates normally but the tilting does not work, the basic inclination angle of single-ring material distribution is calculated according to the material line at that time and the different material line distribution inclination angles determined at furnace start;

[0007] 2) Calculate the weighted distribution angle of coke single ring using formula (1):

[0008]

[0009] 3) Calculate the weighted distribution angle of the ore single ring using formula (2):

[0010]

[0011] 4) Calculate the ore-coke burden distribution inclination angle using formula (3), and take the golden section point on the ore-coke angle difference as the comprehensive ore-coke burden distribution inclination angle. The calculation is as follows:

[0012] Ore-coke burden distribution inclination angle = 0.382 × weighted ore single-ring distribution inclination angle + 0.618 × weighted coke single-ring distribution inclination angle (3)

[0013] 5) The ore-coke burden distribution inclination angle obtained in step 4) is the burden distribution inclination angle of a single ring of the blast furnace during the chute tilting failure.

[0014] 6) Adjust the burden distribution inclination angle of a single ring of the blast furnace manually according to the calculation result of formula (3).

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] By establishing a calculation model for the inclination angle of the burden distribution chute of a single ring of the blast furnace, the present invention can quickly determine the current burden distribution inclination angle and perform manual adjustment in the case of chute tilting failure, which significantly reduces the negative impact of single-ring burden distribution, creates favorable conditions for blast furnace maintenance, and is conducive to the stable and smooth operation of the blast furnace. Specific embodiments

[0017] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following further illustrates the specific embodiments of the present invention in conjunction with embodiments. The following embodiments are used to specifically illustrate the content of the present invention. These embodiments are only general descriptions of the content of the present invention and do not limit the content of the present invention.

[0018] An emergency treatment method for the chute tilting failure of a blast furnace burden distribution specifically includes the following method steps:

[0019] 1) When the chute rotates normally but the tilting does not act, determine the basic inclination angle for calculating the single-ring burden distribution according to the current stock line and the different stock line burden distribution inclination angles determined during furnace start-up.

[0020] 2) Calculate the weighted coke single-ring burden distribution inclination angle using formula (1):

[0021]

[0022] 3) Calculate the weighted ore single-ring burden distribution inclination angle using formula (2):

[0023]

[0024] 4) Calculate the ore-coke burden distribution inclination angle using formula (3), and take the golden section point on the ore-coke angle difference as the comprehensive ore-coke burden distribution inclination angle. The calculation is as follows:

[0025] The ore-coke burden distribution inclination angle = 0.382 × the weighted inclination angle of a single ring of ore + 0.618 × the weighted inclination angle of a single ring of coke (3)

[0026] 5) The ore-coke burden distribution inclination angle obtained in step 4) is the burden distribution inclination angle of a single ring during charging in the blast furnace when the chute tilting fails..

[0027] Example: For a certain 4000m 3 On a certain day, the chute of a 4000m³ blast furnace had a tilting failure while the rotation was normal. In this case, to maintain the normal operation of the blast furnace, the inclination angle of a single ring of burden was quickly calculated and determined, and manually adjusted to the appropriate position, creating favorable conditions for the blast furnace maintenance. The inclination angles corresponding to different burden line positions obtained when measuring the material flow trajectory during furnace start-up are shown in Table 1; the daily ore-coke burden distribution system of the blast furnace is shown in Table 2.

[0028]

[0029] Table 2 Ore-coke burden distribution system

[0030] C 2 3 3 3 2 2 6 O 3 3 3 2 2

[0031] 1. When the chute tilting does not operate, after determining that the chute rotation is normal, determine the basic inclination angle for calculating the single-ring burden according to the current burden line. For example, if the burden line is 1.6m, the corresponding inclination angle is shown in Table 3;

[0032] Table 3

[0033] Ring position 11 10 9 8 7 6 5 4 3 2 1 1.5-2.0 40.1 38 36 34 32 29.9 27.3 23.5 22.2 19 14.9

[0034] 2. Calculate the weighted inclination angle of a single ring of coke:

[0035]

[0036] 3. Calculate the weighted inclination angle of a single ring of ore:

[0037]

[0038]

[0039] 4. Calculate the inclination angle of a single ring of ore-coke:

[0040] The inclination angle of a single ring of ore-coke = 0.382 × 34.45° + 0.618 × 29.4° = 31.33°

[0041] 5. The inclination angle of 31.33° of a single ring of ore-coke obtained in step 4) is the burden distribution inclination angle of a single ring during charging in the blast furnace when the chute tilting fails.

[0042] 6. Adjust the burden distribution inclination angle of a single ring during charging in the blast furnace manually according to the calculation result in step 5).

Claims

1. An emergency treatment method for a blast furnace burden chute tilting failure, characterized in that: The specific steps include the following: 1) When the chute rotates normally but the tilting does not work, the basic inclination angle of single-ring material distribution is calculated according to the material line at that time and the different material line distribution inclination angles determined at furnace start; 2) Calculate the weighted distribution angle of coke single ring using formula (1): 3) Calculate the weighted distribution angle of the ore single ring using formula (2): 4) Calculate the inclination angle of the coke distribution using formula (3), and take the golden section point on the coke angle difference as the comprehensive coke distribution inclination angle, which is calculated as follows: Coke distribution angle = 0.382 × ore single ring weighted distribution angle + 0.618 × coke single ring weighted distribution angle (3) 5) The coke distribution inclination angle obtained in step 4) is the single-ring charging distribution inclination angle of the blast furnace when the chute tilting failure occurs.

2. The emergency treatment method for a tilting failure of a blast furnace burden chute according to claim 1, characterized in that: According to the calculation result of formula (3), the inclination angle of the blast furnace single-ring charging distribution is adjusted manually.

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