Method, system, medium and equipment for detecting charge level position in charge level reducing process of blast furnace

Abstract

The invention discloses a charge level position detection method, system, medium and equipment in the charge level reduction process of a blast furnace, n layers of static pressure detection points are installed on the upper middle portion of a blast furnace body from top to bottom, and n is a positive integer larger than or equal to 1; the method comprises the following steps: monitoring a real-time static pressure value of an ith-layer static pressure detection point and a real-time top pressure value of a stock column in the descending process of the stock column formed by full-coke load furnace charge of the blast furnace; wherein i represents any layer in the n layers of static pressure detection points; if the real-time static pressure value of the ith-layer static pressure detection point is not equal to the real-time top pressure value of the stock column, the real-time charge level position of the stock column is calculated according to a first charge level calculation formula before the stock column descends to the ith-layer static pressure detection point till the real-time charge level position descends to the ith-layer static pressure detection point.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnace maintenance, and in particular to a method, system, medium and equipment for detecting a material surface position during a material lowering process of a blast furnace. Background Art

[0002] At present, when a blast furnace is under maintenance, a charge level lowering operation is usually adopted to empty the charge in the blast furnace.

[0003] During the process of lowering the charge level in a blast furnace, the charge level position is primarily determined by extending the mechanical probe, measuring air consumption, and changing gas composition. When using the extended mechanical probe to measure the charge level position, as the charge level lowers, the temperature inside the blast furnace continues to rise. To control the top temperature, large amounts of atomized water must be frequently sprayed into the blast furnace, leading to significant temperature fluctuations within the furnace. This can easily cause the extended mechanical probe to fall off prematurely in the middle and late stages of the high-pressure section, making it impossible to determine the specific charge level position. When determining the charge level position by referring to changes in air consumption and gas composition, the air consumption and gas composition used as reference for each charge level lowering operation vary significantly, affecting the accuracy of the charge level position determination and, consequently, the progress and safety of the charge level lowering process.

[0004] Therefore, the existing technology has the technical problem of being unable to accurately detect the position of the material surface. Summary of the Invention

[0005] In order to solve or partially solve the technical problem that the existing technology cannot accurately detect the material surface position, the present invention provides a material surface position detection method, system, medium and equipment during the material surface lowering process of a blast furnace, which can accurately judge the specific position of the material surface during the material surface lowering process to ensure the progress and safety of the material surface lowering process, and realize safe, fast and efficient material surface lowering operation of modern large-scale blast furnaces.

[0006] To solve the above technical problems, the first aspect of the present invention discloses a method for detecting the position of the material surface during the material lowering process of a blast furnace, wherein n layers of static pressure detection points are installed from top to bottom in the middle and upper part of the blast furnace body, where n is ≥ 1 and is a positive integer; the method comprises:

[0007] During the descent of the material column formed by the full coke load charge of the blast furnace, the real-time static pressure value of the static pressure detection point at the i-th layer and the real-time top pressure value of the material column are monitored; wherein i represents any one of the n layers of static pressure detection points;

[0008] If the real-time static pressure value of the static pressure detection point at the i-th layer is not equal to the real-time top pressure value of the material column, before the material column descends to the static pressure detection point at the i-th layer, the real-time material surface position of the material column is calculated according to the first material surface calculation formula until the real-time material surface position descends to the static pressure detection point at the i-th layer;

[0009] The calculation formula for the first material surface is:

[0010]

[0011] Among them, H i It indicates the real-time material surface position before the material column descends to the static pressure detection point of the i-th layer, H0 indicates the position elevation of the material surface at 0 meters, H 初 Indicates the initial material surface height, H (i+1)标高 Indicates the location elevation of the static pressure detection point on the i+1th floor, H i标高 Indicates the location elevation of the static pressure detection point on the i-th layer, P i represents the real-time static pressure value of the static pressure detection point of the i-th layer, P 顶 Indicates the real-time top pressure value of the material column, P i初 Represents the initial pressure value of the static pressure detection point of the i-th layer.

[0012] Optionally, if the real-time static pressure value of the static pressure detection point of the i-th layer is equal to the real-time top pressure value of the material column, the real-time material surface position of the material column is determined as the position of the static pressure detection point of the i-th layer.

[0013] Optionally, before the material column descends to the static pressure detection point of the i-th layer, after calculating the real-time material level position of the material column according to the first material level calculation formula, the method further includes:

[0014] Real-time top temperature of the material column in the blast furnace;

[0015] If the real-time top temperature of the material column is greater than the set temperature threshold, the blast furnace is triggered to perform air reduction operation.

[0016] Optionally, after triggering the operation of reducing air flow and / or lowering the top pressure of the material column in the blast furnace, the method further comprises:

[0017] Obtain the real-time air reduction material surface position and real-time static pressure value of the material column after performing the j-th air reduction operation; j ≥ 1 and is a positive integer, and j represents any air reduction operation before the material column descends to the static pressure detection point of the i-th layer;

[0018] Monitoring the real-time static pressure value of the material column before performing the j+1th air reduction operation;

[0019] According to the second material surface calculation formula H i,j+1 =H0+(H 初 -H i,j )+(H i,j -H i标高 )*(1-(P i,j+1 -P 顶 ) / (P i,j -P 顶)) Calculate the real-time air reduction material surface position of the material column after performing the j+1th air reduction operation; wherein, H i,j+1 It represents the real-time air reduction surface position of the material column after performing the j+1th air reduction operation, H i,j represents the real-time air reduction surface position of the material column after the jth air reduction operation, P i,j+1 represents the real-time static pressure value of the material column before performing the j+1th air reduction operation, P i,j It represents the real-time static pressure value of the material column after performing the j-th air reduction operation.

[0020] Optionally, obtaining the real-time air reduction material surface position of the material column after performing the j-th air reduction operation specifically includes:

[0021] If j=1, calculate the real-time reduced air level position H of the material column after the first reduced air level operation according to the second material level calculation formula. i,j ; Wherein, the real-time wind reduction material surface position of the material column before performing the first wind reduction operation is calculated by the first material surface calculation formula.

[0022] Optionally, if the real-time top temperature of the material column is greater than a set temperature threshold, triggering a wind reduction operation on the blast furnace specifically includes:

[0023] If the real-time top temperature of the material column is greater than the set temperature threshold, it triggers the blast furnace to reduce air flow and / or reduce top pressure.

[0024] Optionally, among the n layers of static pressure detection points, m static pressure detection points are set on each layer and evenly distributed on the circumference, m≥2 and is a positive integer; the real-time static pressure value of the static pressure detection point on the i-th layer is the average of the m static pressure monitoring points.

[0025] A second aspect of the present invention discloses a system for detecting the position of a material surface during a material lowering process in a blast furnace, wherein n layers of static pressure detection points are installed from top to bottom in the middle and upper part of the blast furnace body, where n is ≥ 1 and is a positive integer; the system comprises:

[0026] A monitoring unit is configured to monitor the real-time static pressure value of the i-th layer static pressure detection point and the real-time top pressure value of the material column during the descending process of the material column formed by the full coke load charge of the blast furnace; wherein i represents any layer of the n layers of static pressure detection points;

[0027] a material level calculation unit configured to calculate the real-time material level position of the material column according to a first material level calculation formula before the material column descends to the static pressure detection point at the i-th layer, if the real-time static pressure value at the static pressure detection point at the i-th layer is not equal to the real-time top pressure value of the material column, until the real-time material level position descends to the static pressure detection point at the i-th layer;

[0028] The calculation formula for the first material surface is:

[0029]

[0030] Among them, H i It indicates the real-time material surface position before the material column descends to the static pressure detection point of the i-th layer, H0 indicates the position elevation of the material surface at 0 meters, H 初 Indicates the initial material surface height, H (i+1)标高 Indicates the location elevation of the static pressure detection point on the i+1th floor, H i标高 Indicates the location elevation of the static pressure detection point on the i-th layer, P i represents the real-time static pressure value of the static pressure detection point of the i-th layer, P 顶 Indicates the real-time top pressure value of the material column, P i初 Represents the initial pressure value of the static pressure detection point of the i-th layer.

[0031] According to a third aspect of the present invention, a computer-readable storage medium is disclosed, on which a computer program is stored. When the program is executed by a processor, the steps of the above method are implemented.

[0032] A fourth aspect of the present invention discloses a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the program.

[0033] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages:

[0034] The technical solution disclosed in the present invention takes into account that the shape of the charge will not change due to the low temperature in the upper part of the blast furnace block belt, and its pressure is in the form of uniform loss in the vertical height. Therefore, n layers of static pressure detection points are installed from top to bottom in the middle and upper part of the blast furnace body. When the charge column descends as a whole, the method for judging the charge surface position is selected in combination with the real-time static pressure value of each layer of static pressure detection points and the real-time top pressure value of the charge column. When the real-time static pressure value of each layer of static pressure detection points and the real-time top pressure value of the charge column are not equal, the first charge surface calculation formula is constructed according to the logic that the pressure loss value is proportional to the height of the charge column descent, and the real-time charge surface position of the charge column before descending before each layer of static pressure detection points is accurately calculated to ensure the progress and safety of the charge surface lowering process.

[0035] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0037] Figure 1 A flow chart of a method for detecting material level during a material lowering process in a blast furnace according to an embodiment of the present invention is shown;

[0038] Figure 2 A schematic diagram showing the positions of static pressure detection points arranged in a blast furnace cross section according to an embodiment of the present invention is shown;

[0039] Figure 3 A cross-sectional view of a furnace body static pressure detection point according to an embodiment of the present invention is shown;

[0040] Figure 4 A schematic diagram of a material level position detection system during a material level lowering process in a blast furnace according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0041] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0042] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0043] In the first aspect, the method for detecting the material surface position during the material lowering process of a blast furnace provided by an embodiment of the present invention is implemented on the basis of installing n layers of static pressure detection points from top to bottom in the middle and upper part of the blast furnace body, where n≥1 and is a positive integer.

[0044] Specifically, after the high-pressure smelting process begins, the entire charge column in the blast furnace moves downward, while maintaining constant air volume and top pressure. This causes the positions of the three sections of the column, namely the blocky zone, the soft melting zone, and the dripping zone, to drop accordingly. Because the upper portion of the blast furnace's blocky zone remains cold, the charge's shape remains unchanged (no reduction reaction occurs), resulting in a uniform pressure loss across its vertical height. Therefore, n layers of static pressure monitoring points are installed in the blocky zone area above the blast furnace shaft (including the bosh) to monitor the static pressure in the furnace in real time. A novel scheme is developed to calculate the real-time charge column position, based on the logic that the pressure loss value is proportional to the height of the charge column's descent.

[0045] like Figure 1 As shown, the method for detecting the material surface position during the material lowering process of a blast furnace provided by an embodiment of the present invention includes at least the following steps:

[0046] S101, during the descending process of the material column formed by the full coke load charge of the blast furnace, monitoring the real-time static pressure value of the static pressure detection point of the i-th layer and the real-time top pressure value of the material column.

[0047] Where i represents any layer among the n layers of static pressure detection points.

[0048] The charge column refers to the physical form of the charge formed by the full coke load in a blast furnace. The blast furnace has an initial charge line, typically 1.5 meters. When the full coke load reaches the initial charge line, charging is stopped. The initial charge column height is measured, and the high-pressure charge-lowering operation begins. This initial charge column height is used to calculate the real-time charge column position as it descends above the static pressure detection point on the nth layer.

[0049] During the descending process of the material column, the real-time static pressure value of the static pressure detection point of the i-th layer and the real-time top pressure value of the material column are monitored.

[0050] The n layers of static pressure detection points installed from top to bottom in the middle and upper part of the blast furnace shaft are respectively: n, n-1, ... 1. Among them, i represents any layer of the n layers of static pressure detection points.

[0051] Since the material column passes through n layers of static pressure detection points installed from top to bottom during its descent, the technical solution of the present invention first uses the static pressure detection point on the nth layer to monitor and calculate the real-time material surface position of the descending material column (i.e., i = n), and then uses the static pressure detection point on the n-1th layer, the static pressure detection point on the n-2th layer, and so on, until the static pressure detection point on the first layer is used to calculate the real-time material surface position of the descending material column. The value of i is calculated from large to small.

[0052] To accurately measure static pressure, set m static pressure monitoring points on each floor of n static pressure monitoring points, evenly distributed around the circumference, where m is a positive integer ≥ 2. The real-time static pressure value at the static pressure monitoring point on the i-th floor is the average of the m static pressure monitoring points.

[0053] Furthermore, after monitoring the real-time static pressure value of the static pressure detection point at the i-th layer and the real-time top pressure value of the material column, it is determined whether the real-time static pressure value of the static pressure detection point at the i-th layer and the real-time top pressure value of the material column are equal.

[0054] S102, if the real-time static pressure value of the static pressure detection point of the i-th layer is not equal to the real-time top pressure value of the material column, before the material column descends to the static pressure detection point of the i-th layer, the real-time material surface position of the material column is calculated according to the first material surface calculation formula until the real-time material surface position descends to the static pressure detection point of the i-th layer.

[0055] The calculation formula for the first material surface is:

[0056]

[0057] Among them, H i It indicates the real-time material surface position before the material column descends to the static pressure detection point of the i-th layer. H0 indicates the elevation of the material surface at 0 meters. 初 Indicates the initial material surface height, H (i+1)标高 Indicates the location elevation of the static pressure detection point on the i+1th floor, H i标高 Indicates the location elevation of the static pressure detection point on the i-th layer, H 初 Indicates the initial material surface height, P i represents the real-time static pressure value of the static pressure detection point on the i-th layer, P 顶 Indicates the real-time top pressure value of the material column, P i初 It represents the initial pressure value of the static pressure detection point at the i-th layer, which is detected when the material column descends to the static pressure detection point at the i+1-th layer.

[0058] It is worth noting that if i = n, then H (i+1)标高 The value of is the initial material surface height of the material column: H (i+1)标高 =H 初 .

[0059] In the present technical solution, considering that the temperature in the upper part of the blast furnace block belt is low, the shape of the charge will not change, and its pressure is in the form of uniform loss in the vertical height, n layers of static pressure detection points are installed from top to bottom in the middle and upper part of the blast furnace body. When the charge column descends as a whole, the method of judging the charge surface position is selected in combination with the real-time static pressure value of each layer of static pressure detection points and the real-time top pressure value of the charge column. When the real-time static pressure value of each layer of static pressure detection points and the real-time top pressure value of the charge column are not equal, the first charge surface calculation formula is constructed according to the logic that the pressure loss value is proportional to the height of the charge column descent, and the real-time charge surface position of the charge column before each layer of static pressure detection points is accurately calculated to ensure the progress and safety of the charge surface lowering process.

[0060] Furthermore, if the real-time static pressure value of the static pressure detection point of the i-th layer is equal to the real-time top pressure value of the material column, it means that the material column has dropped to the position of the static pressure detection point of the i-th layer, and the real-time material surface position of the material column is determined as the position of the static pressure detection point of the i-th layer.

[0061] In an optional embodiment, as the material level decreases, the temperature in the blast furnace continues to rise. In order to control the top temperature, the blast furnace needs to be cooled frequently, resulting in huge temperature changes in the furnace environment, affecting the safety of the material level.

[0062] Therefore, before the material column descends to the static pressure detection point of the i-th layer, after calculating the real-time material level position of the material column according to the first material level calculation formula, the real-time top temperature of the material column in the blast furnace will be measured in real time; if the real-time top temperature of the material column is greater than the set temperature threshold, the blast furnace will be triggered to reduce the air flow, ensuring the safe and rapid lowering of the material level and ensuring the smooth progress of the material level lowering work.

[0063] Of course, in order to quickly cool down the blast furnace, if the real-time top temperature of the charge column exceeds the set temperature threshold, the blast furnace will be triggered to reduce the air flow and / or reduce the top pressure. In the top pressure reduction operation, the top pressure is reduced by adjusting the opening of the blast furnace top pressure control valve.

[0064] Furthermore, since temperature changes in the furnace environment can also affect the position of the material surface, in order to accurately detect the material surface position, the corresponding real-time air reduction material surface position is detected after each air reduction and / or top pressure reduction operation to ensure smooth material surface reduction.

[0065] Taking the air reduction operation as an example, the following describes a detection scheme for the real-time air reduction material surface position after each air reduction operation. The scheme specifically performs the following steps:

[0066] S201: Obtain the real-time air reduction material surface position and real-time static pressure value of the material column after the j-th air reduction operation. j is a positive integer ≥ 1, and j represents any air reduction operation before the material column descends to the i-th static pressure detection point.

[0067] When obtaining the real-time reduced air level position of the material column after the j-th reduced air operation, the real-time reduced air level position H of the material column after the j-th reduced air operation is calculated according to the second material level calculation formula. i,j The second material surface calculation formula will be introduced below and will not be repeated here. i,j The real-time air reduction material surface position of the material column before performing the j-th air reduction operation (ie, the first air reduction operation) will be used, and this position is calculated by the first material surface calculation formula.

[0068] The real-time static pressure value after the j-th wind reduction operation is obtained by monitoring the static pressure value of the static pressure detection point on the i-th floor.

[0069] S202, monitoring the real-time static pressure value of the material column before performing the j+1th air reduction operation.

[0070] Among them, the material column is also continuously decreasing between the j-th air reduction operation and the j+1-th air reduction operation. Therefore, before the material column performs the j+1-th air reduction operation, the static pressure value of the static pressure detection point on the i-th layer will be monitored again to obtain the real-time static pressure value of the material column before performing the j+1-th air reduction operation.

[0071] S203 , calculating the real-time reduced airflow material surface position of the material column after performing the j+1th reduced airflow operation according to the second material surface calculation formula.

[0072] The calculation formula for the second material surface is:

[0073] H i,j+1 =H0+(H 初 -H i,j )+(H i,j -H i标高 )*(1-(P i,j+1 -P 顶 ) / (P i,j -P 顶 ))

[0074] Among them, H i,j+1 It represents the real-time air reduction surface position of the material column after the j+1th air reduction operation, H i,j It represents the real-time air reduction surface position of the material column after the jth air reduction operation, P i,j+1 It represents the real-time static pressure value of the material column before performing the j+1th air reduction operation, P i,j It represents the real-time static pressure value of the material column after performing the j-th air reduction operation.

[0075] Among them, H i,j+1 It represents the real-time air reduction surface position of the material column after the j+1th air reduction operation, H i,jIt represents the real-time air reduction surface position of the material column after the jth air reduction operation, P i,j+1 It represents the real-time static pressure value of the material column before performing the j+1th air reduction operation, P i,j It represents the real-time static pressure value of the material column after performing the j-th air reduction operation.

[0076] In this technical solution, the real-time reduced-air material level position for the subsequent air reduction operation is calculated using the real-time static pressure values ​​before and after two adjacent air reduction operations and the real-time reduced-air material level position for the previous air reduction operation, combined with a second material level calculation formula. The real-time reduced-air material level position of the material column after a number of air reduction operations is calculated using the second material level calculation formula until the real-time top temperature of the material column falls below the set temperature threshold, or the material column has dropped to the static pressure detection point at the i-th layer.

[0077] In order to further illustrate and explain the technical solution of the present invention, refer to Figure 2 , is a schematic diagram of the locations of static pressure detection points set in the blast furnace cross section.

[0078] There are four layers of static pressure detection points set in the upper middle part of the blast furnace body.

[0079] Among them, the elevation at the center line of the tuyere is the elevation of the material surface at 0 meters: H0 = 17.8m.

[0080] The initial pressure value at the static pressure detection point of the first layer is expressed as P 1初 Indicates that the corresponding elevation H 1标高 =23.65m;

[0081] The initial pressure value at the static pressure detection point of the second layer is expressed as P 2初 Indicates that the corresponding elevation H 2标高 =25.95m;

[0082] The initial pressure value at the static pressure detection point of the third layer is expressed as P 3初 Indicates that the corresponding elevation H 3标高 =27.95m;

[0083] The initial pressure value at the static pressure detection point on the fourth layer is expressed as P 4初 Indicates that the corresponding elevation H 4标高 =30.45m;

[0084] The initial material level of the material column is 1.5m above the material line, and the elevation of the initial material level is H5 = 44.25m.

[0085] See Figure 3 , is a cross-sectional view of the static pressure detection points of the furnace body. There are 4 detection points evenly distributed in the circumferential direction on each layer.

[0086] When the full coke load charge is added to the 1.5m initial charge line of the blast furnace charge surface, the charge is stopped and the high pressure charge surface operation is started. At this time, the initial static pressure value of the static pressure detection point at the fourth layer is monitored to be P 4初 .

[0087] When the material column surface is above the fourth-layer static pressure detection point, perform the following operations:

[0088] Since the temperature of the upper part of the block belt is relatively low, the charge does not participate in the reduction reaction. The real-time charge surface position when the charge column descends above the static pressure detection point on the fourth layer is calculated by the resistance loss of the upper block belt.

[0089] The specific calculation formula is:

[0090] H4=H0+(H5-H 4标高 )*(1-(P4-P 顶 ) / (P 4初 -P 顶 ))

[0091] Among them, P4 represents the real-time static pressure value of the static pressure detection point on the fourth layer.

[0092] During this descending stage, the real-time top temperature of the material column in the blast furnace is monitored in real time.

[0093] If the real-time top temperature of the material column exceeds the set temperature threshold, it indicates that the real-time top temperature of the material column is too high to be controlled. At this time, the blast furnace triggers the first air reduction and / or top pressure reduction operation, and calculates the real-time reduced air level position of the material column after the first air reduction and / or top pressure reduction operation according to the second material level calculation formula.

[0094] If the real-time top temperature of the material column is still greater than the set temperature threshold, the blast furnace triggers the second air reduction and / or top pressure reduction operation, and calculates the real-time air reduction material level position of the material column after the second air reduction and / or top pressure reduction operation according to the second material level calculation formula.

[0095] At this time, taking the wind reduction operation as an example, the corresponding calculation formula is:

[0096] H 42 =H0+(H5-H 41 )+(H 41 -H 4标高 )*(1-(P 42 -P 顶 ) / (P 41 -P 顶 ))

[0097] Among them, H 42 Indicates the real-time reduced airflow material surface position after the second airflow reduction operation when the material column is above the static pressure detection point on the fourth layer.42 Indicates the real-time static pressure value before the second air reduction operation when the material column surface is above the fourth-layer static pressure detection point; H 41 Indicates the real-time reduced airflow material surface position after the first airflow reduction operation when the material column is above the static pressure detection point on the fourth layer; P 41 It indicates the real-time static pressure value after the first air reduction operation when the material surface of the material column is above the static pressure detection point on the fourth layer.

[0098] The real-time reduced air level position of the material column after several air reduction operations is calculated according to the above calculation formula until the real-time top temperature of the material column is lower than the set temperature threshold, or the material column has dropped to the position of the fourth-layer static pressure detection point.

[0099] If the real-time static pressure value of the static pressure detection point of the i-th layer is equal to the real-time top pressure value of the material column: P 顶 =P4, indicating that the material column has dropped to the position of the static pressure detection point of the 4th layer. At this time, the initial pressure value P of the static pressure detection point of the third layer is monitored. 3初 .

[0100] When the material column's surface is below the fourth-layer static pressure detection point and above the third-layer static pressure detection point, perform the following operations:

[0101] The real-time material surface position when the material column descends above the static pressure detection point position on the third layer is calculated by the resistance loss of the upper block belt.

[0102] The specific calculation formula is:

[0103] H3=H0+(H5-H 4标高 )+(H 4标高 -H 3标高 )*(1-(P3-P 顶 ) / (P 3初 -P 顶 ))

[0104] Among them, P3 represents the real-time static pressure value of the static pressure detection point on the third layer.

[0105] During this descending stage, the real-time top temperature of the material column in the blast furnace is monitored in real time.

[0106] If the real-time top temperature of the material column exceeds the set temperature threshold, it indicates that the real-time top temperature of the material column is too high to be controlled. At this time, the blast furnace triggers the first air reduction and / or top pressure reduction operation, and calculates the real-time reduced air level position of the material column after the first air reduction and / or top pressure reduction operation according to the second material level calculation formula.

[0107] If the real-time top temperature of the material column is still greater than the set temperature threshold, the blast furnace triggers the second air reduction and / or top pressure reduction operation, and calculates the real-time air reduction material level position of the material column after the second air reduction and / or top pressure reduction operation according to the second material level calculation formula.

[0108] At this time, taking the wind reduction operation as an example, the corresponding calculation formula is:

[0109] H 32 =H0+(H5-H 31 )+(H 31 -H 3标高 )*(1-(P 32 -P 顶 ) / (P 31 -P 顶 ))

[0110] Among them, H 32 Indicates the real-time reduced airflow material surface position after the second airflow reduction operation when the material column is above the static pressure detection point on the third layer. 32 Indicates the real-time static pressure value before the second air reduction operation when the material column surface is above the third-layer static pressure detection point; H 31 Indicates the real-time reduced airflow material surface position after the first airflow reduction operation when the material column is above the static pressure detection point on the third layer; P 31 It indicates the real-time static pressure value after the first air reduction operation when the material surface of the material column is above the static pressure detection point on the third layer.

[0111] The real-time reduced air surface position of the material column after several air reduction operations is calculated according to the above calculation formula until the real-time top temperature of the material column is lower than the set temperature threshold, or the material column has dropped to the position of the third-layer static pressure detection point.

[0112] If the real-time static pressure value of the third layer static pressure detection point is equal to the real-time top pressure value of the material column: P 顶 =P3, indicating that the material column has dropped to the third layer static pressure detection point position. At this time, monitor the initial pressure value P of the second layer static pressure detection point. 2初 .

[0113] When the material column's surface position is below the third layer static pressure detection point and above the second layer static pressure detection point, perform the following operations;

[0114] The real-time material surface position when the material column descends above the second layer static pressure detection point is calculated by the resistance loss of the upper block belt.

[0115] The specific calculation formula is:

[0116] H2=H0+(H5-H 3标高)+(H 3标高 -H 2标高 )*(1-(P2-P 顶 ) / (P 2初 -P 顶 ))

[0117] Wherein, P2 represents the real-time static pressure value of the static pressure detection point on the second layer.

[0118] During this descending stage, the real-time top temperature of the material column in the blast furnace is monitored in real time.

[0119] If the real-time top temperature of the material column exceeds the set temperature threshold, it indicates that the real-time top temperature of the material column is too high to be controlled. At this time, the blast furnace triggers the first air reduction and / or top pressure reduction operation, and calculates the real-time reduced air level position of the material column after the first air reduction and / or top pressure reduction operation according to the second material level calculation formula.

[0120] If the real-time top temperature of the material column is still greater than the set temperature threshold, the blast furnace triggers the second air reduction and / or top pressure reduction operation, and calculates the real-time air reduction material level position of the material column after the second air reduction and / or top pressure reduction operation according to the second material level calculation formula.

[0121] At this time, taking the wind reduction operation as an example, the corresponding calculation formula is:

[0122] H 22 =H0+(H5-H 21 )+(H 21 -H 2标高 )*(1-(P 22 -P 顶 ) / (P 21 -P 顶 ))

[0123] Among them, H 22 Indicates the real-time reduced airflow material surface position after the second airflow reduction operation when the material column is above the second-layer static pressure detection point. 22 Indicates the real-time static pressure value before the second air reduction operation when the material column surface is above the second layer static pressure detection point; H 21 Indicates the real-time reduced airflow material surface position after the first airflow reduction operation when the material column is above the second-layer static pressure detection point. 21 It indicates the real-time static pressure value after the first air reduction operation when the material surface of the material column is above the second-layer static pressure detection point.

[0124] The real-time reduced air surface position of the material column after several air reduction operations is calculated according to the above calculation formula until the real-time top temperature of the material column is lower than the set temperature threshold, or the material column has dropped to the position of the second-layer static pressure detection point.

[0125] If the real-time static pressure value of the second layer static pressure detection point is equal to the real-time top pressure value of the material column: P 顶 = P2, indicating that the material column has dropped to the position of the second layer static pressure detection point. At this time, the initial pressure value P of the first layer static pressure detection point is monitored. 1初 .

[0126] When the material column's surface is below the second-layer static pressure detection point and above the first-layer static pressure detection point, perform the following steps:

[0127] The real-time material surface position when the material column descends above the static pressure detection point of the first layer is calculated by the resistance loss of the upper block belt.

[0128] The specific calculation formula is:

[0129] H1=H0+(H5-H 2标高 )+(H 2标高 -H 1标高 )*(1-(P1-P 顶 ) / (P 1初 -P 顶 ))

[0130] Wherein, P1 represents the real-time static pressure value of the static pressure detection point on the first layer.

[0131] During this descending stage, the real-time top temperature of the material column in the blast furnace is monitored in real time.

[0132] If the real-time top temperature of the material column exceeds the set temperature threshold, it indicates that the real-time top temperature of the material column is too high to be controlled. At this time, the blast furnace triggers the first air reduction and / or top pressure reduction operation, and calculates the real-time reduced air level position of the material column after the first air reduction and / or top pressure reduction operation according to the second material level calculation formula.

[0133] If the real-time top temperature of the material column is still greater than the set temperature threshold, the blast furnace triggers the second air reduction and / or top pressure reduction operation, and calculates the real-time air reduction material level position of the material column after the second air reduction and / or top pressure reduction operation according to the second material level calculation formula.

[0134] At this time, taking the wind reduction operation as an example, the corresponding calculation formula is:

[0135] H 12 =H0+(H5-H 11 )+(H 11 -H 1标高 )*(1-(P 12 -P 顶 ) / (P 11 -P 顶 ))

[0136] Among them, H12 Indicates the real-time reduced airflow material surface position after the second airflow reduction operation when the material column is above the static pressure detection point of the first layer. 12 Indicates the real-time static pressure value before the second air reduction operation when the material column surface is above the first layer static pressure detection point; H 11 Indicates the real-time reduced airflow material surface position after the first airflow reduction operation when the material column is above the static pressure detection point of the first layer; P 11 It indicates the real-time static pressure value after the first air reduction operation when the material surface of the material column is above the static pressure detection point of the first layer.

[0137] The real-time air reduction material surface position of the material column after several air reduction operations is calculated according to the above calculation formula until the real-time top temperature of the material column is lower than the set temperature threshold, or the material column has dropped to the position of the first layer static pressure detection point.

[0138] If the real-time static pressure value of the first layer static pressure detection point is equal to the real-time top pressure value of the material column: P 顶 =P1, indicating that the material column has dropped to the first layer of static pressure detection point. At this time, it means that the material surface has completely entered the furnace waist.

[0139] After the material surface enters the furnace waist, the height of the entire material column in the blast furnace is greatly reduced. When the oxygen content in the coal gas increases dangerously and the material level is safely lowered, the gas is shut off at normal pressure, and then the material level is lowered at normal pressure until the material level drops to the tuyere zone.

[0140] In the second aspect, based on the same inventive concept as the method for detecting the material surface position during the material lowering process of a blast furnace provided in the embodiment of the first aspect, the embodiment of the present invention further provides a material surface position detection system during the material lowering process of a blast furnace, wherein n layers of static pressure detection points are installed from top to bottom in the middle and upper part of the blast furnace body; see Figure 4 , the system comprising:

[0141] The monitoring unit 401 is configured to monitor the real-time static pressure value and the real-time top pressure value of the material column at the i-th static pressure detection point during the descending process of the material column formed by the full coke load charge of the blast furnace, wherein i represents any one of the n layers of static pressure detection points;

[0142] a material level calculation unit 402 configured to calculate the real-time material level position of the material column according to a first material level calculation formula before the material column descends to the static pressure detection point at the i-th layer if the real-time static pressure value at the static pressure detection point at the i-th layer is not equal to the real-time top pressure value of the material column, until the real-time material level position descends to the static pressure detection point at the i-th layer;

[0143] The calculation formula for the first material surface is:

[0144]

[0145] Among them, H i It indicates the real-time material surface position before the material column descends to the static pressure detection point of the i-th layer, H0 indicates the position elevation of the material surface at 0 meters, H 初 Indicates the initial material surface height, H (i+1)标高 Indicates the location elevation of the static pressure detection point on the i+1th floor, H i标高 Indicates the location elevation of the static pressure detection point on the i-th layer, P i represents the real-time static pressure value of the static pressure detection point of the i-th layer, P 顶 Indicates the real-time top pressure value of the material column, P i初 Represents the initial pressure value of the static pressure detection point of the i-th layer.

[0146] It should be noted that the material surface position detection system during the material lowering process of a blast furnace provided by an embodiment of the present invention, wherein the specific manner in which each module performs operations has been described in detail in the method embodiment provided in the above-mentioned first aspect. The specific implementation process can refer to the method embodiment provided in the above-mentioned first aspect, and will not be elaborated on here.

[0147] In the third aspect, based on the same inventive concept as the method for detecting the material surface position during the material lowering process of a blast furnace provided in the embodiment of the first aspect, the embodiment of the present invention also discloses a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0148] In the fourth aspect, based on the same inventive concept as the method for detecting the material surface position during the material lowering process of a blast furnace provided in the embodiment of the first aspect, the embodiment of the present invention also discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the aforementioned methods when executing the program.

[0149] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0150] The technical solution disclosed in the present invention takes into account that the shape of the charge will not change due to the low temperature in the upper part of the blast furnace block belt, and its pressure is in the form of uniform loss in the vertical height. Therefore, n layers of static pressure detection points are installed from top to bottom in the middle and upper part of the blast furnace body. When the charge column descends as a whole, the method for judging the charge surface position is selected in combination with the real-time static pressure value of each layer of static pressure detection points and the real-time top pressure value of the charge column. When the real-time static pressure value of each layer of static pressure detection points and the real-time top pressure value of the charge column are not equal, the first charge surface calculation formula is constructed according to the logic that the pressure loss value is proportional to the height of the charge column descent, and the real-time charge surface position of the charge column before descending before each layer of static pressure detection points is accurately calculated to ensure the progress and safety of the charge surface lowering process.

[0151] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0152] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for detecting the position of the material surface during the material lowering process of a blast furnace, characterized in that: N layers of static pressure detection points are installed from top to bottom in the middle and upper part of the blast furnace body, where n is greater than or equal to 1 and is a positive integer; the method comprises: During the descent of the material column formed by the full coke load charge of the blast furnace, the real-time static pressure value of the static pressure detection point at the i-th layer and the real-time top pressure value of the material column are monitored; wherein i represents any one of the n layers of static pressure detection points; If the real-time static pressure value of the static pressure detection point at the i-th layer is not equal to the real-time top pressure value of the material column, before the material column descends to the static pressure detection point at the i-th layer, the real-time material surface position of the material column is calculated according to the first material surface calculation formula until the real-time material surface position descends to the static pressure detection point at the i-th layer; The calculation formula for the first material surface is: Among them, H i It indicates the real-time material surface position before the material column descends to the static pressure detection point of the i-th layer, H0 indicates the position elevation of the material surface at 0 meters, H 初 Indicates the initial material surface height, H (i+1)标高 Indicates the location elevation of the static pressure detection point on the i+1th floor, H i标高 Indicates the location elevation of the static pressure detection point on the i-th layer, P i represents the real-time static pressure value of the static pressure detection point of the i-th layer, P 顶 Indicates the real-time top pressure value of the material column, P i初 Represents the initial pressure value of the static pressure detection point of the i-th layer.

2. The method according to claim 1, wherein If the real-time static pressure value of the static pressure detection point of the i-th layer is equal to the real-time top pressure value of the material column, the real-time material surface position of the material column is determined as the position of the static pressure detection point of the i-th layer.

3. The method according to claim 1, wherein Before the material column descends to the static pressure detection point of the i-th layer, after calculating the real-time material level position of the material column according to the first material level calculation formula, the method further includes: Real-time top temperature of the material column in the blast furnace; If the real-time top temperature of the material column is greater than the set temperature threshold, the blast furnace is triggered to perform air reduction operation.

4. The method according to claim 3, wherein After triggering the operation of reducing the air flow and / or lowering the top pressure of the material column in the blast furnace, the method further includes: Obtain the real-time air reduction material surface position and real-time static pressure value of the material column after performing the j-th air reduction operation; j ≥ 1 and is a positive integer, and j represents any air reduction operation before the material column descends to the static pressure detection point of the i-th layer; Monitoring the real-time static pressure value of the material column before performing the j+1th air reduction operation; According to the second material surface calculation formula H i,j+1 =H0+(H 初 -H i,j )+(H i,j -H i标高 )*(1-(P i,j+1 -P 顶 ) / (P i,j -P 顶 )) Calculate the real-time air reduction material surface position of the material column after performing the j+1th air reduction operation; wherein, H i,j+1 It represents the real-time air reduction surface position of the material column after performing the j+1th air reduction operation, H i,j represents the real-time air reduction surface position of the material column after the jth air reduction operation, P i,j+1 represents the real-time static pressure value of the material column before performing the j+1th air reduction operation, P i,j It represents the real-time static pressure value of the material column after performing the j-th air reduction operation.

5. The method according to claim 4, wherein The obtaining of the real-time reduced airflow material surface position of the material column after performing the j-th reduced airflow operation specifically includes: If j=1, calculate the real-time reduced air level position H of the material column after the first reduced air level operation according to the second material level calculation formula. i,j ; Wherein, the real-time wind reduction material surface position of the material column before performing the first wind reduction operation is calculated by the first material surface calculation formula.

6. The method according to claim 3, wherein If the real-time top temperature of the material column is greater than the set temperature threshold, triggering the blast furnace to perform air reduction operation, specifically including: If the real-time top temperature of the material column is greater than the set temperature threshold, it triggers the blast furnace to reduce air flow and / or reduce top pressure.

7. The method according to claim 1, wherein Among the n layers of static pressure detection points, m static pressure detection points are set on each layer and are evenly distributed on the circumference, where m≥2 and is a positive integer; the real-time static pressure value of the static pressure detection point on the i-th layer is the average of the m static pressure monitoring points.

8. A material level position detection system during the material lowering process of a blast furnace, characterized in that: N layers of static pressure detection points are installed from top to bottom in the middle and upper part of the blast furnace body, where n≥1 and is a positive integer; the system includes: A monitoring unit is configured to monitor the real-time static pressure value of the i-th layer static pressure detection point and the real-time top pressure value of the material column during the descending process of the material column formed by the full coke load charge of the blast furnace; wherein i represents any layer of the n layers of static pressure detection points; a material level calculation unit configured to calculate the real-time material level position of the material column according to a first material level calculation formula before the material column descends to the static pressure detection point at the i-th layer, if the real-time static pressure value at the static pressure detection point at the i-th layer is not equal to the real-time top pressure value of the material column, until the real-time material level position descends to the static pressure detection point at the i-th layer; The calculation formula for the first material surface is: Among them, H i It indicates the real-time material surface position before the material column descends to the static pressure detection point of the i-th layer, H0 indicates the position elevation of the material surface at 0 meters, H 初 Indicates the initial material surface height, H (i+1)标高 Indicates the location elevation of the static pressure detection point on the i+1th floor, H i标高 Indicates the location elevation of the static pressure detection point on the i-th layer, P i represents the real-time static pressure value of the static pressure detection point of the i-th layer, P 顶 Indicates the real-time top pressure value of the material column, P i初 Represents the initial pressure value of the static pressure detection point of the i-th layer.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the method according to any one of claims 1 to 7 are implemented.

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