TWI708851B - Method for predicting channeling phenomenon of blast furnace - Google Patents

Abstract

A method for predicting a channel phenomenon of a blast furnace includes: using plural pressure sensors to obtain a current pressure value and plural previous pressure values of each of a first blast furnace layer and a second blast furnace layer, the first blast furnace layer and the second blast furnace layer are respectively located at a highest layer and a second highest layer of the blast furnace; using the current pressure value and the previous pressure values of each of the first blast furnace layer and the second blast furnace layer to calculate a current pressure difference of each of the first blast furnace layer and the second blast furnace layer; comparing the current pressure differences of the first blast furnace layer and the second blast furnace layer with a preset threshold to obtain a judgement result; and predicting the channel phenomenon at least according to the judgement result.

Description

Method for predicting occurrence of pipe flow phenomenon in blast furnace

The invention relates to a method for predicting the occurrence of pipe flow phenomenon in a blast furnace.

In general blast furnace ironmaking operations, raw materials such as iron ore, coke, or lime are stacked in layers in the blast furnace to generate molten iron through oxidation-reduction reactions. In order to make the hot air from the tuyere flow into the center of the furnace stably, the raw material in the center of the blast furnace is less than around the center, and the raw materials in the furnace can be inclined at a certain angle toward the center of the furnace.

The shape, distribution, and particle size of the raw materials will affect the gas flow in the furnace, which in turn affects the condition of the blast furnace and the output of molten iron. However, when the blast furnace performs the oxidation-reduction reaction at high temperature, the arrangement of the internal raw materials often fails to make the gas flow uniformly in the furnace as expected, and may even cause abnormal ventilation such as channeling phenomenon (Channeling Phenomenon). The occurrence of pipe flow phenomenon will make the reaction in the blast furnace uneven, resulting in unstable furnace conditions, increased fuel rate, damage to the blast furnace wall and other negative effects, which will reduce the output of molten iron and reduce the life of the blast furnace, or even black smoke The problem of air pollution coming out of the stove top.

In order to avoid the negative effects of the pipe flow phenomenon, the blast furnace industry has developed various technologies to predict the occurrence of pipe flow, so as to take some preventive measures in advance, such as reducing the blast volume of the tuyere. However, the current pipeline flow prediction technology cannot make real-time predictions on the production line, and the accuracy rate is only 40-60%. Therefore, it is necessary to develop a method for predicting the occurrence of pipeline flow in a blast furnace.

The purpose of this disclosure is to propose a method for predicting the occurrence of pipe flow phenomenon in a blast furnace. The blast furnace includes a first blast furnace layer and a second blast furnace layer, which are the highest and the second highest among the layers of the blast furnace. The first blast furnace layer and the second blast furnace layer The two blast furnace layers are equipped with at least one pressure sensor. The method for predicting the blast furnace pipe flow phenomenon includes: obtaining the current pressure value and multiplicity of each of the first blast furnace layer and the second blast furnace layer by the pressure sensor. Pen previous pressure value; calculate the current pressure difference of each of the first blast furnace layer and the second blast furnace layer by the current pressure value and the previous pressure value of each of the first blast furnace layer and the second blast furnace layer; The current pressure difference between the first blast furnace layer and the second blast furnace layer is compared with the set threshold value to obtain a first judgment result; and a prediction step is performed to predict whether a channeling phenomenon is about to be predicted based on at least the first judgment result occur.

In some embodiments, the current pressure difference of the first blast furnace layer is the difference between the current pressure value of the first blast furnace layer and the minimum value of the previous pressure value of the first blast furnace layer; The pressure difference is the difference between the current pressure value of the second blast furnace layer and the minimum value of the previous pressure value of the second blast furnace layer.

其中

為目前壓力差，且

為第一高爐層或第二高爐層位於高爐的層別，

為目前壓力值，且

為目前時間點，

、

、

、

、

為先前壓力值，且

、

、

、

、

分別為目前時間點之前10秒、前20秒、前30秒、前40秒、前50秒的時間點。 In some embodiments, the aforementioned current pressure difference calculation formula is as follows:

among them

Is the current pressure difference, and

The first blast furnace floor or the second blast furnace floor is located at the floor of the blast furnace,

Is the current pressure value, and

Is the current time,

,

,

,

,

Is the previous pressure value, and

,

,

,

,

They are 10 seconds, 20 seconds, 30 seconds, 40 seconds, and 50 seconds before the current time point.

In some embodiments, the above-mentioned first judgment result is to compare whether the current pressure difference between the first blast furnace layer and the second blast furnace layer is greater than or equal to a set threshold; wherein the set threshold is 0.1 kg/cm 2 (kg/cm ² ) , 0.15 kg/cm ² or 0.2 kg/cm ² .

In some embodiments, when the first judgment result is that the current pressure difference of the first blast furnace layer is less than the set threshold value and the current pressure difference of the second blast furnace layer is greater than or equal to the set threshold value, a warning signal is issued to notify the operation of the blast furnace When the first judgment result is that the current pressure difference between the first blast furnace layer and the second blast furnace layer is greater than or equal to the set threshold value, a hazard signal is issued to notify the operator of the blast furnace.

In some embodiments, the above-mentioned blast furnace further includes a top dust scrubber located on the top of the blast furnace, wherein the top dust scrubber has a control valve, and the method for predicting the occurrence of a pipe flow phenomenon in the blast furnace further includes: combining the current opening degree of the control valve with The preset opening threshold is compared to obtain the second judgment result. The prediction step is to predict whether the pipeline flow phenomenon is about to occur based on at least the first judgment result and the second judgment result.

In some embodiments, the above-mentioned second judgment result compares whether the current opening degree is greater than or equal to a preset opening degree threshold; wherein the preset opening degree threshold is 60%, 65%, 75% or 80%.

In some embodiments, the method for predicting the occurrence of a pipe flow phenomenon in a blast furnace further includes: obtaining the highest two-layer pressure difference of the blast furnace, where the highest two-layer pressure difference is the current pressure value of the first blast furnace layer and the current pressure of the second blast furnace layer The difference between the values; and comparing the pressure difference between the highest two layers with the preset pressure threshold to obtain the third judgment result. The prediction step is to predict whether the pipeline flow phenomenon is about to occur based on at least the first judgment result and the third judgment result.

In some embodiments, the third judgment result is to compare whether the pressure difference between the highest two layers is greater than or equal to a preset pressure threshold; wherein the preset pressure threshold is 0.15 kg/cm ² or 0.2 kg/cm ² .

In some embodiments, the method for predicting the occurrence of a pipe flow phenomenon in a blast furnace further includes: comparing the blast furnace air volume of the blast furnace with a preset air volume threshold to obtain the fourth judgment result. The prediction step is to predict whether the pipeline flow phenomenon is about to occur based on at least the first judgment result and the fourth judgment result.

In some embodiments, the above-mentioned fourth judgment result compares whether the blast furnace air volume is greater than or equal to a preset air volume threshold; wherein the preset air volume threshold is 2000 gaseous cubic meters per minute (Nm ³ /min) or 4000 Nm ³ /min .

In some embodiments, the method for predicting the occurrence of a pipe flow phenomenon in a blast furnace further includes: comparing the heat load temperature of the blast furnace with a preset temperature threshold to obtain the fifth judgment result. The prediction step is to predict whether the pipeline flow phenomenon is about to occur based on at least the first judgment result and the fifth judgment result.

In some embodiments, the fifth judgment result is to compare whether the thermal load temperature is greater than or equal to a preset temperature threshold; wherein the preset temperature threshold is 500 degrees Celsius (°C), 700°C, 800°C, or 1000 °C.

In order to make the above-mentioned features and advantages of the present disclosure more obvious and understandable, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

The following is a detailed description of the embodiments with the accompanying drawings, but the provided embodiments are not used to limit the scope of the present invention, and the description of the structure and operation is not used to limit the order of its execution, any recombination of components The structure and the devices with equal effects are all within the scope of the present invention. In addition, the drawings are for illustrative purposes only and are not drawn according to the original size. Regarding the "first", "second", "third", etc. used in this text, it does not specifically refer to the order or sequence, but only distinguishes elements or operations described in the same technical terms.

FIG. 1 is a schematic structural diagram of a blast furnace smelting system 100 according to an embodiment of the disclosure. The blast furnace smelting system 100 includes a blast furnace 110 and a pressure sensor 120. The blast furnace 110 contains a plurality of blast furnace layers 112 to be monitored, and the blast furnace layers 112 are marked as blast furnace layers 112 ₁ , 112 ₂ , 112 ₃ , 112 ₄ , 112 ₅ according to the layers in the blast furnace 110 from low to high. , 112 ₆ , 112 ₇ , 112 ₈ . For the convenience of description in the following description, in this article, the highest blast furnace layer in the blast furnace 110 is referred to as the first blast furnace layer 112 ₈ and the second highest blast furnace layer in the blast furnace 110 The blast furnace layer of is called the second blast furnace layer 112 ₇ . It should be noted that although the number of blast furnace layers 112 of the blast furnace 110 illustrated in FIG. 1 is eight in total, this number is only an example, and the present disclosure is not limited to this.

The pressure sensor 120 is disposed in each blast furnace layer 112 one to one. In other words, each blast furnace layer 112 has a pressure sensor 120 to detect the pressure value of each blast furnace layer 112. In the embodiment shown in FIG. 1, each blast furnace layer 112 has only one pressure sensor 120 to detect the pressure value of each blast furnace layer 112, and these pressure sensors 120 are set in the same orientation , For example, set at the north side of the blast furnace 110. However, in other embodiments of the present invention, each blast furnace layer 112 may also be provided with multiple pressure sensors 120. For example, each blast furnace layer 112 may be located at the north, south, east, and east sides of the blast furnace 110. One pressure sensor 120 is provided on the west side. In other words, there are four pressure sensors 120 in each blast furnace layer 112 to provide a more complete pressure value detection mechanism.

FIG. 2 is a schematic flowchart of a method 1000 for predicting occurrence of a pipe flow phenomenon in a blast furnace according to an embodiment of the disclosure. In the embodiment of the present disclosure, the method 1000 for predicting the occurrence of pipe flow phenomenon in a blast furnace can be imported into a process computer (also referred to as a distributed control system (DCS)) in a blast furnace control room. In this way, The operator of the blast furnace 110 can directly use the blast furnace process computer to monitor whether the ventilation state of the blast furnace 110 is stable in the blast furnace control room, thereby effectively preventing the occurrence of abnormal blast furnace ventilation. Specifically, the method 1000 for predicting the occurrence of pipeline flow phenomenon in a blast furnace is used to predict whether the pipeline flow phenomenon is about to occur, and when the pipeline flow phenomenon is predicted to occur, a warning signal is issued in advance to notify the operator of the blast furnace 110 to make the blast furnace 110 Of operators take appropriate action in advance. In the embodiment of the present disclosure, the above-mentioned warning signal may be a text message, a color message, a light message or a sound message, but the present disclosure is not limited to this.

Please refer to FIG. 1 and FIG. 2 together, the method 1000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace includes steps 1100, 1200, 1300, and 1400. In step 1100, the current pressure value and multiple previous pressure values of each blast furnace layer 112 are obtained by the pressure sensor 120 disposed on each blast furnace layer 112. In the disclosed embodiment, the above-mentioned current pressure value is the pressure value detected by the pressure sensor 120 at the current time point. For example, the current pressure value of the blast furnace layer 112 ₁ is set at the blast furnace layer 112 The pressure value of the blast furnace layer 112 ₁ detected by the pressure sensor 120 of ₁ at the current time point. In the embodiment of the present disclosure, the aforementioned previous pressure values are the five time points of the pressure sensor 120 in the previous minute (ie: the first 10 seconds, the first 20 seconds, the first 30 seconds, and the last of the current time point). 40 seconds before the time point 50 seconds) of the detected value of the pressure stroke, for example, the previous pressure value blast layer ₁₁₂₁ by a tie layer 112 is disposed on the blast furnace ₁ is one minute prior to the pressure sensor 120 Five pressure values of the blast furnace layer 112 ₁ detected at five time points within.

It is worth mentioning that in the embodiment of this disclosure, a neural network-like algorithm module can also be installed in the process control computer in the blast furnace control room, so that the neural network-like algorithm module can be used to detect The obtained pressure value of the blast furnace layer 112 is subjected to an interpolation algorithm to calculate the pressure value of any point on the furnace wall of the blast furnace 110 (including any point where the pressure sensor 120 is not provided). In this way, even The pressure sensor 120 is not arranged in each blast furnace layer 112 one-to-one, and can also be calculated by using a neural network-like algorithm module to calculate the current pressure value and the multiplicity of each blast furnace layer 112 according to an interpolation algorithm. The previous pressure value of the pen.

In step 1200, the current pressure difference of each blast furnace layer 112 is calculated based on the current pressure value of each blast furnace layer 112 and multiple previous pressure values. In the embodiment of the present disclosure, the aforementioned current pressure difference is the difference between the aforementioned current pressure value and the minimum value of the aforementioned multiple previous pressure values. For example, the current pressure difference of the blast furnace layer 112 ₁ is previously the pressure difference between the minimum value and the current stroke pressure blast furnace layers ₁₁₂₁ layer _1121.

(1) 其中，

為目前壓力差，且

為高爐層112位於高爐110的層別，換言之，高爐層112 ₁的目前壓力差可表示為

，高爐層112 ₂的目前壓力差可表示為

，依此類推。其中，

為目前壓力值，且

係表示目前時間點，換言之，高爐層112 ₁的目前壓力值可表示為

，高爐層112 ₂的目前壓力值可表示為

，依此類推。其中，

、

、

、

、

為先前壓力值，且

、

、

、

、

分別為目前時間點之前10秒、前20秒、前30秒、前40秒、前50秒的時間點，換言之，高爐層112 ₁的目前時間點之前10秒的時間點的先前壓力值可表示為

，高爐層112 ₁的目前時間點之前20秒的時間點的先前壓力值可表示為

，高爐層112 ₂的目前時間點之前40秒的時間點的先前壓力值可表示為

，高爐層112 ₂的目前時間點之前50秒的時間點的先前壓力值可表示為

，依此類推。 In the embodiment of the present disclosure, the aforementioned current pressure difference calculation formula is as follows:

(1) Among them,

Is the current pressure difference, and

Is that the blast furnace layer 112 is located at the level of the blast furnace 110. In other words, the current pressure difference of the blast furnace layer 112 ₁ can be expressed as

, The current pressure difference of the blast furnace layer 112 ₂ can be expressed as

,So on and so forth. among them,

Is the current pressure value, and

Is the current time point. In other words, the current pressure value of the blast furnace layer 112 ₁ can be expressed as

, The current pressure value of the blast furnace layer 112 ₂ can be expressed as

,So on and so forth. among them,

,

,

,

,

Is the previous pressure value, and

,

,

,

,

They are 10 seconds before the current time point, 20 seconds before, 30 seconds before, 40 seconds, and 50 seconds before the current time point. In other words, the previous pressure value at the time point 10 seconds before the current time point of the blast furnace layer 112 ₁ can be expressed for

, The previous pressure value 20 seconds before the current time point of the blast furnace layer 112 ₁ can be expressed as

, The previous pressure value 40 seconds before the current time point of the blast furnace layer 112 ₂ can be expressed as

, The previous pressure value of the blast furnace layer 112 ₂ 50 seconds before the current time point can be expressed as

,So on and so forth.

In step 1300, the current pressure difference of each blast furnace layer 112 is compared with a set threshold value to obtain a first judgment result. In the embodiment of the present disclosure, the first judgment result is to compare whether the current pressure difference of each blast furnace layer 112 is greater than or equal to a set threshold value, where the set threshold value may be 0.1 kg/cm 2 (kg/cm ² ), 0.15 kg/cm ² or 0.2 kg/cm ² , but the present disclosure is not limited to this. For example, the operator of the blast furnace 110 can adjust the threshold value according to the actual measurement data of the blast furnace 110.

(2) 其中，

為目前壓力差，且

為高爐層112位於高爐110的層別，

為設定門檻值。 In the disclosed embodiment, the above-mentioned calculation formula for comparing whether the current pressure difference of each blast furnace layer 112 is greater than or equal to the set threshold value is as shown in the following formula (2):

(2) Among them,

Is the current pressure difference, and

Because the blast furnace layer 112 is located on the layer of the blast furnace 110,

To set the threshold value.

In step 1400, a prediction step is performed to predict whether the channeling phenomenon of the blast furnace 110 is about to occur, and when it is predicted that the channeling phenomenon is about to occur, a warning signal is issued in advance to notify the operator of the blast furnace 110 to operate the blast furnace 110 The person takes appropriate action in advance.

FIG. 3 is a flowchart of the prediction step of step 1400 of the method 1000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace according to an embodiment of the disclosure. The prediction step of step 1400 includes steps 1410, 1420, 1430, 1440, and 1450.

是否大於或等於設定門檻值

。若步驟1410的判定結果為否，則進入步驟1420：預測出高爐110之管道流現象不會發生，意即，高爐110的爐內通氣狀態為「正常」；若步驟1410的判定結果為是，則進入步驟1430。 In step 1410, according to the first judgment result obtained in step 1300, it is determined whether the current pressure difference of the second highest blast furnace layer 112 in the blast furnace 110 is greater than or equal to the set threshold value. In other words, step 1410 is obtained according to step 1300 To determine the current pressure difference of the second blast furnace layer 112 ₇

Is it greater than or equal to the set threshold

. If the determination result of step 1410 is no, proceed to step 1420: it is predicted that the pipe flow phenomenon of the blast furnace 110 will not occur, which means that the ventilation state of the blast furnace 110 is "normal"; if the determination result of step 1410 is yes, Then enter step 1430.

是否大於或等於設定門檻值

。若步驟1430的判定結果為否，則進入步驟1440：預測出高爐110之管道流現象有發生的可能，高爐冶煉系統100發出「警戒」訊號的警告訊號來通知高爐110的操作者；若步驟1430的判定結果為是，則進入步驟1450：預測出高爐110之管道流現象發生的可能性很高，高爐冶煉系統100發出「危險」訊號的警告訊號來通知高爐110的操作者。 In step 1430, according to the first judgment result obtained in step 1300, it is determined whether the current pressure difference of the highest blast furnace layer 112 in the blast furnace 110 is greater than or equal to the set threshold value. In other words, step 1430 is based on the first judgment obtained in step 1300 A judgment result to judge the current pressure difference of the first blast furnace layer 112 ₈

Is it greater than or equal to the set threshold

. If the determination result of step 1430 is no, proceed to step 1440: predict that the pipeline flow phenomenon of the blast furnace 110 may occur, and the blast furnace smelting system 100 sends out a warning signal of "alert" signal to notify the operator of the blast furnace 110; if step 1430 If the result of the determination is yes, proceed to step 1450: it is predicted that the pipeline flow phenomenon of the blast furnace 110 is highly likely to occur, and the blast furnace smelting system 100 sends a warning signal of "danger" signal to notify the operator of the blast furnace 110.

In the embodiment of the present disclosure, the ventilation state in the furnace predicted by the method for predicting the occurrence of pipe flow phenomenon in the blast furnace of the present disclosure can be presented with a visual image on the display screen of the process program-controlled computer in the blast furnace control room. In the visualized image, a color message such as a light signal is used as a warning signal to indicate the above-mentioned furnace ventilation state, so that the operator of the blast furnace 110 can clearly observe the furnace ventilation state of the blast furnace 110. For example, a green light can be displayed to indicate that the ventilation state in the furnace is "normal", a yellow light can be displayed to indicate that the ventilation state in the furnace is an abnormal "alert" signal, and a red light can be displayed to indicate that the ventilation state in the furnace is Abnormal "dangerous" signal, but this disclosure is not limited to this.

Specifically, the step 1400 of step 1400 of the method 1000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace of the present disclosure is based on actual measurement findings: when it is determined in step 1300 that the first judgment result is that the current pressure difference of the blast furnace layer 112 is greater than or equal to Set the threshold value (that is, the pressure value change within 1 minute exceeds the set threshold value), and the higher the level of the blast furnace layer 112 to the blast furnace 110 corresponding to this determination result, the greater the possibility of abnormal ventilation in the furnace High (that is, the possibility of pipe flow phenomenon in the blast furnace 110 is higher).

、

皆小於設定門檻值

時，預測出高爐110的爐內通氣狀態為「正常」(即步驟1420)；(2)當於步驟1300所得之第一判斷結果為第一高爐層112 ₈的目前壓力差

小於設定門檻值

且第二高爐層112 ₇的目前壓力差

大於或等於設定門檻值

時，發出「警戒」訊號來通知高爐110的操作者(即步驟1440)；(3)當於步驟1300所得之第一判斷結果為第一高爐層112 ₈與第二高爐層112 ₇的目前壓力差

、

皆大於或等於設定門檻值

時，發出「危險」訊號來通知高爐110的操作者(即步驟1450)。 Specifically, the prediction step as shown in FIG. 3 which may be substituted with unequivocal manner: (1) when the judgment result obtained in the first step 1300 of a first layer ₁₁₂₈ and the second blast furnace ₁₁₂₇ of the current layer Pressure difference

,

Are less than the set threshold

When, it is predicted that the ventilation state in the blast furnace 110 is "normal" (ie step 1420); (2) When the first judgment result obtained in step 1300 is the current pressure difference of the first blast furnace layer 112 ₈

Less than the set threshold

And the current pressure difference of the second blast furnace layer 112 ₇

Greater than or equal to the set threshold

When the time, the "alert" signal is issued to notify the operator of the blast furnace 110 (i.e. step 1440); (3) When the first judgment result obtained in step 1300 is the current pressure of the first blast furnace layer 112 ₈ and the second blast furnace layer 112 ₇ difference

,

Are greater than or equal to the set threshold

At this time, a "dangerous" signal is issued to notify the operator of the blast furnace 110 (ie, step 1450).

Please return to Fig. 1, the blast furnace 110 also includes a top dust scrubber 130 located on the top of the blast furnace 110. In other words, the top dust scrubber 130 is connected to the top of the blast furnace 110 to receive the blast furnace smelting system 100 for smelting. The exhaust gas is discharged, and the exhaust gas is purified. The stove top dust scrubber 130 has a control valve 132 which is used to adjust the flow of exhaust gas into the stove top scrubber 130. The control valve 132 may also be referred to as an Annular Gap Element (AGE) or Ring Slit Element (RSE). Generally speaking, the opening degree of the control valve 132 (hereinafter referred to as opening) is automatically adjusted according to the amount of exhaust gas discharged from the blast furnace 110. For example, when the amount of exhaust gas discharged from the blast furnace 110 increases, the exhaust gas will impact the control valve 132 to increase the opening degree of the control valve 132. For another example, when the amount of exhaust gas discharged from the blast furnace 110 is reduced, the control valve 132 will automatically reduce the opening to match the current exhaust gas volume of the blast furnace 110.

FIG. 4 is a schematic flowchart of a method 2000 for predicting occurrence of a pipe flow phenomenon in a blast furnace according to an embodiment of the disclosure. In the embodiment of the present disclosure, the method 2000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace can be introduced into a process control computer in a blast furnace control room. The method 2000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace includes steps 1100, 1200, 1300, 2300, and 2400. The steps 1100, 1200, and 1300 of the method 2000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace are the same as the steps 1100, 1200, and 1300 of the method 1000 for predicting a occurrence of a pipe flow phenomenon in a blast furnace, and will not be repeated here.

1 and 4 together, in step 2300, compare the current opening degree (hereinafter referred to as the current opening degree) of the control valve 132 of the top dust scrubber 130 with the preset opening degree threshold to obtain a second judgment result. In the embodiment of the present disclosure, the second judgment result is to compare whether the current opening degree of the control valve 132 is greater than or equal to a preset opening degree threshold, wherein the aforementioned preset opening degree threshold is 60%, 65%, 75% or 80%, but the present disclosure is not limited to this. The preset opening threshold can also be a value between 60% and 80%, or, for example, the operator of the blast furnace 110 can use the actual measurement data of the blast furnace 110 to make appropriate Adjust the preset opening threshold value.

In step 2400, a prediction step is performed to predict whether the pipeline flow phenomenon of the blast furnace 110 is about to occur. FIG. 5 is a flowchart of the prediction step of step 2400 of the method 2000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace according to an embodiment of the present disclosure. The prediction step includes steps 2410, 1410, 1420, 1430, 1440, and 1450. Among them, the steps 1410, 1420, 1430, 1440, 1450 of the prediction step of step 2400 of the method 2000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace are the same as the steps 1410, 1420 of the prediction step of step 1400 of the method 1000 for predicting occurrence of a pipe flow phenomenon in a blast furnace , 1430, 1440, and 1450, so I won’t repeat them here. It should be understood that although FIG. 5 shows sequential steps, the prediction step of step 2400 of the method 2000 for predicting the occurrence of pipe flow phenomenon in a blast furnace does not necessarily have to be executed in the order of the steps shown in FIG. The sequential execution of these steps is within the scope of this disclosure. In other words, the order of these steps may be interchangeable and at least some of the steps may be performed in a different order, or at least two or more steps may be performed overlapping or almost simultaneously in time.

In step 2410, it is determined whether the current opening degree of the control valve 132 of the top dust scrubber 130 is greater than or equal to the preset opening degree threshold value according to the second judgment result obtained in step 2300. If the determination result of step 2410 is no, then proceed to step 1420; if the determination result of step 2410 is yes, then proceed to step 1410.

Specifically, the step 2400 of step 2400 of the method 2000 for predicting the occurrence of pipe flow phenomena in a blast furnace of the present disclosure is based on the step 1400 of step 1400 of the method 1000 for pipe flow phenomena, and further by predicting the occurrence of pipe flow phenomena in a blast furnace. The second judgment result obtained in step 2300 of the method 2000 for the flow phenomenon uses the current opening of the control valve 132 of the top dust scrubber 130 as an auxiliary factor for predicting the possibility of occurrence of the pipeline flow phenomenon. Furthermore, the predicting step of step 2400 of the method 2000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace of the present disclosure is when it is determined that the second determination result obtained in step 2300 is that the current opening of the control valve 132 of the top dust scrubber 130 is greater than Or equal to the preset opening threshold, and when it is determined in step 1300 that the first judgment result is that the current pressure difference of the blast furnace layer 112 is greater than or equal to the set threshold, and the blast furnace layer 112 corresponding to the first judgment result The higher the level of the blast furnace 110, the higher the possibility of occurrence of abnormal ventilation in the furnace (that is, the higher the possibility of occurrence of a pipe flow phenomenon in the blast furnace 110).

FIG. 6 is a schematic flowchart of a method 3000 for predicting occurrence of a pipe flow phenomenon in a blast furnace according to an embodiment of the disclosure. In the embodiment of the present disclosure, the method 3000 for predicting the occurrence of the pipe flow phenomenon in the blast furnace can be introduced into the process control computer in the blast furnace control room. The method 3000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace includes steps 1100, 1200, 1300, 2300, 3210, 3310, 3320, 3330, and 3400. The steps 1100, 1200, 1300, and 2300 of the method 3000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace are the same as the steps 1100, 1200, 1300, and 2300 of the method 2000 for predicting a occurrence of a pipe flow phenomenon in a blast furnace, and will not be repeated here. It should be understood that although FIG. 6 shows sequential steps, the method 3000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace does not necessarily need to be executed in the order of the steps shown in FIG. 6, and all the steps are executed in a different order. Within the scope of this disclosure. In other words, the order of these steps may be interchangeable and at least some of the steps may be performed in a different order, or at least two or more steps may be performed overlapping or almost simultaneously in time.

與第二高爐層112 ₇的目前壓力值

之間的差值。 1 and 6 together, in step 3210, calculate the current pressure value of the highest blast furnace layer 112 in the blast furnace 110 and the current pressure of the second highest blast furnace layer 112 in the blast furnace 110. The difference between the values (the difference is referred to herein as the "highest two-layer pressure difference"). In other words, the highest pressure difference between the two layers is the current pressure value of the first blast furnace layer 112 ₈

And the current pressure value of the second blast furnace layer 112 ₇

The difference between.

In step 3310, the highest two-layer pressure difference obtained in step 3210 is compared with a preset pressure threshold to obtain a third judgment result. In the disclosed embodiment, the third judgment result is to compare whether the pressure difference between the highest two layers is greater than or equal to a preset pressure threshold, where the preset pressure threshold is 0.15 kg/cm ² or 0.2 kg/cm ² , but The disclosure is not limited to this. For example, the operator of the blast furnace 110 can appropriately adjust the preset pressure threshold according to the actual measurement data of the blast furnace 110.

In step 3320, the blast furnace air volume of the blast furnace 110 is compared with a preset air volume threshold to obtain a fourth judgment result. In the disclosed embodiment, the fourth judgment result is to compare whether the blast furnace air volume of the blast furnace 110 is greater than or equal to a preset air volume threshold, wherein the preset air volume threshold is 2000 gaseous cubic meters per minute (Nm ³ /min) or 4000 Nm ³ /min, but the disclosure is not limited to this. For example, the operator of the blast furnace 110 can appropriately adjust the preset air volume threshold according to the actual measurement data of the blast furnace 110.

In step 3330, the heat load temperature of the blast furnace 110 (also referred to as the skin flow temperature) is compared with a preset temperature threshold to obtain a fifth judgment result. In the disclosed embodiment, the fifth judgment result is to compare whether the thermal load temperature of the blast furnace 110 is greater than or equal to a preset temperature threshold, wherein the preset temperature threshold is 500 degrees Celsius (°C), 700°C, 800 °C or 1000°C, but the present disclosure is not limited to this. For example, the operator of the blast furnace 110 can appropriately adjust the preset temperature threshold according to the actual measurement data of the blast furnace 110.

In step 3400, a prediction step is performed to predict whether the pipeline flow phenomenon of the blast furnace 110 is about to occur. 7A and 7B are flow diagrams of the prediction step of step 3400 of the method 3000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace according to an embodiment of the present disclosure. The prediction step includes steps 3412, 3414, 3416, 2410, 1410, 1420, 1430, 1440, and 1450. Among them, the steps 2410, 1410, 1420, 1430, 1440, 1450 of the prediction step of the method 3000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace are the same as the step 2410 of the prediction step 2400 of the method 2000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace , 1410, 1420, 1430, 1440, 1450, and will not be repeated here. It should be understood that although FIGS. 7A and 7B show sequential steps, however, the prediction step of step 3400 of the method 3000 for predicting the occurrence of a pipe flow phenomenon in a blast furnace does not necessarily follow the steps shown in FIGS. 7A and 7B. The order is executed, and the execution of these steps in a different order is within the scope of the present disclosure. In other words, the order of these steps may be interchangeable and at least some of the steps may be performed in a different order, or at least two or more steps may be performed overlapping or almost simultaneously in time.

In step 3412, it is determined whether the pressure difference between the highest two layers is greater than or equal to the preset pressure threshold according to the third judgment result obtained in step 3310. If the determination result of step 3412 is no, then enter node B, that is, enter step 1420 (refer to FIGS. 7A and 7B); if the determination result of step 3412 is yes, then enter step 3414.

In step 3414, it is determined whether the blast furnace air volume of the blast furnace 110 is greater than or equal to a preset air volume threshold according to the fourth judgment result obtained in step 3320. If the determination result of step 3414 is no, then enter node B, that is, enter step 1420 (refer to FIGS. 7A and 7B); if the determination result of step 3414 is yes, then enter step 3416.

In step 3416, it is determined whether the heat load temperature of the blast furnace 110 is greater than or equal to the preset temperature threshold according to the fifth judgment result obtained in step 3330. If the determination result of step 3416 is no, then enter node B, that is, enter step 1420 (refer to Figures 7A and 7B); if the determination result of step 3416 is yes, then enter node A, that is, enter step 2410 ( Refer to Figure 7A and Figure 7B).

Specifically, the step 3400 of the method 3000 for predicting the occurrence of a blast furnace phenomenon in the present disclosure is based on the step 2400 of the method 2000 for predicting the occurrence of a blast furnace. The third judgment result, the fourth judgment result, and the fifth judgment result obtained in steps 3310, 3320, and 3330 of the method 3000 of pipe flow phenomenon are used to utilize the highest two-layer pressure difference, the blast furnace air volume of the blast furnace 110, and the heat load temperature of the blast furnace 110 Used as an auxiliary factor to predict the possibility of pipeline flow phenomenon. Furthermore, the prediction step of step 3400 of the method 3000 for predicting the occurrence of pipe flow phenomenon in a blast furnace of the present disclosure is when it is determined that the third judgment result obtained in step 3310 is that the pressure difference between the highest two layers is greater than or equal to the preset pressure threshold. And, when it is determined in step 3320 that the fourth determination result is that the blast furnace air volume of the blast furnace 110 is greater than or equal to the preset air volume threshold, and when it is determined in step 3330 that the fifth determination result is that the heat load temperature of the blast furnace 110 is greater than or Equal to the preset temperature threshold, and when it is determined in step 2300 that the second determination result is that the current opening of the control valve 132 of the top dust scrubber 130 is greater than or equal to the preset opening threshold, and when it is determined in step The first judgment result obtained in 1300 is that the current pressure difference of the blast furnace layer 112 is greater than or equal to the set threshold value, and the higher the blast furnace layer 112 and the blast furnace 110 corresponding to the first judgment result are, abnormal ventilation in the furnace occurs The higher the possibility of, (that is, the higher the possibility of pipe flow phenomenon in the blast furnace 110).

In summary, this disclosure proposes a method for predicting the occurrence of a channeling phenomenon in a blast furnace to predict whether the channeling phenomenon is about to occur, and when the channeling phenomenon is predicted to occur, a warning signal is issued to notify the operation of the blast furnace The phenomenon of pipeline flow may occur. The method of predicting the occurrence of pipe flow phenomenon in the blast furnace disclosed in this disclosure can be imported into the process control computer in the blast furnace control room. Therefore, the operator of the blast furnace can directly monitor the ventilation status of the blast furnace by using the blast furnace process control computer in the blast furnace control room. Whether it is stable, and when the pipeline flow phenomenon is predicted to occur, a warning signal is issued in advance to notify the blast furnace operator, so that the blast furnace operator can take appropriate actions in advance, thereby effectively preventing the occurrence of abnormal blast furnace ventilation. It is worth mentioning that the method of predicting the occurrence of pipe flow phenomenon in the blast furnace disclosed in the present disclosure has a more accurate prediction rate than the conventional technology, and it can predict the occurrence of pipe flow phenomenon about 10 minutes to 15 minutes earlier. Therefore, there is enough time for the blast furnace operator to properly adjust the furnace operation to avoid abnormal ventilation of the blast furnace.

The features of several embodiments are summarized above, so those who are familiar with the art can better understand the aspect of the disclosure. Those who are familiar with the art should understand that they can easily use the present disclosure as a basis to design or modify other processes and structures, thereby achieving the same goals and/or the same advantages as the embodiments described herein. . Those who are familiar with this art should also understand that these equivalent constructions do not depart from the spirit and scope of this disclosure, and they can make various changes, substitutions and alterations without departing from the spirit and scope of this disclosure.

100: blast furnace smelting system 110: blast furnace 112, 112 ₁ , 112 ₂ , 112 ₃ , 112 ₄ , 112 ₅ , 112 ₆ : blast furnace layer 112 ₇ : blast furnace layer/second blast furnace layer 112 ₈ : blast furnace layer/first blast furnace layer 120: Pressure sensor 130: Furnace top dust scrubber 132: Control valve 1000, 2000, 300: Method to predict pipe flow phenomenon in blast furnace 1100, 1200, 1300, 1400, 1410, 1420, 1430, 1440, 1450, 2300, 2400, 2410, 3210, 3310, 3320, 3330, 3400, 3412, 3414, 3416: steps

From the following detailed description in conjunction with the accompanying drawings, a better understanding of the aspect of the disclosure can be obtained. It should be noted that, according to industry standard practices, each feature is not drawn to scale. In fact, in order to make the discussion clearer, the size of each feature can be increased or decreased arbitrarily. [Figure 1] is a schematic structural diagram of a blast furnace smelting system according to an embodiment of the disclosure. [Fig. 2] is a schematic flowchart of a method for predicting occurrence of pipe flow phenomenon in a blast furnace according to an embodiment of the disclosure. [Fig. 3] is a schematic flowchart of the prediction steps of the method for predicting the occurrence of pipe flow phenomenon in a blast furnace according to an embodiment of the present disclosure. [Fig. 4] is a schematic flow chart of a method for predicting occurrence of pipe flow phenomenon in a blast furnace according to an embodiment of the present disclosure. [Fig. 5] is a schematic flow chart of the prediction steps of the method for predicting the occurrence of a pipe flow phenomenon in a blast furnace according to an embodiment of the present disclosure. [Fig. 6] is a schematic flowchart of a method for predicting occurrence of pipe flow phenomenon in a blast furnace according to an embodiment of the disclosure. [FIG. 7A] and [FIG. 7B] are flowcharts of the prediction steps of the method for predicting the occurrence of pipe flow phenomenon in a blast furnace according to an embodiment of the present disclosure.

Domestic deposit information (please note in the order of deposit institution, date and number) no Foreign hosting information (please note in the order of hosting country, institution, date and number) no

1400, 1410, 1420, 1430, 1440, 1450: steps

Claims (13)

A method for predicting the occurrence of a pipe flow phenomenon in a blast furnace, wherein the blast furnace includes a first blast furnace layer and a second blast furnace layer that are respectively located at the highest and the second highest among the layers of the blast furnace, wherein the first blast furnace layer and the second blast furnace layer At least one pressure sensor is installed on the two blast furnace floors, and the method for predicting the blast furnace pipe flow phenomenon includes: Obtaining a current pressure value and a plurality of previous pressure values of each of the first blast furnace layer and the second blast furnace layer by the pressure sensors; Calculate a current pressure of each of the first blast furnace layer and the second blast furnace layer by the current pressure value and the previous pressure values of each of the first blast furnace layer and the second blast furnace layer difference; Comparing the current pressure differences between the first blast furnace layer and the second blast furnace layer with a set threshold value to obtain a first judgment result; and A prediction step is performed to predict whether a channeling phenomenon is about to occur based on at least the first judgment result. The method for predicting the occurrence of pipe flow phenomenon in a blast furnace as described in claim 1, The current pressure difference of the first blast furnace layer is the difference between the current pressure value of the first blast furnace layer and the minimum value of the previous pressure values of the first blast furnace layer; The current pressure difference of the second blast furnace layer is the difference between the current pressure value of the second blast furnace layer and the minimum value of the previous pressure values of the second blast furnace layer. The method for predicting the occurrence of pipe flow phenomenon in a blast furnace as described in claim 1, wherein the current pressure difference is calculated as follows:

among them

Is the current pressure difference, and

Is the layer where the first blast furnace layer or the second blast furnace layer is located in the blast furnace;

Is the current pressure value, and

Is a current point in time; where

,

,

,

,

Are these previous pressure values, and

,

,

,

,

They are 10 seconds, 20 seconds, 30 seconds, 40 seconds, and 50 seconds before the current time point. The method for predicting the occurrence of a pipe flow phenomenon in a blast furnace according to claim 1, wherein the first judgment result is to compare whether the current pressure difference between the first blast furnace layer and the second blast furnace layer is greater than or equal to the set threshold; The threshold value is 0.1 kg/cm 2 (kg/cm ² ), 0.15 kg/cm ² or 0.2 kg/cm ² . The method for predicting the occurrence of pipe flow phenomenon in a blast furnace as described in claim 4, When the first judgment result is that the current pressure difference of the first blast furnace layer is less than the set threshold value and the current pressure difference of the second blast furnace layer is greater than or equal to the set threshold value, a warning signal is issued to notify the An operator of the blast furnace; When the first judgment result is that the current pressure differences between the first blast furnace layer and the second blast furnace layer are greater than or equal to the set threshold value, a danger signal is issued to notify the operator of the blast furnace. The method for predicting the occurrence of a pipe flow phenomenon in a blast furnace according to claim 1, wherein the blast furnace further includes a top dust scrubber located on the top of the blast furnace, wherein the top dust scrubber has a control valve, and the prediction blast furnace generation pipe The method of flow phenomenon further includes: Comparing the current opening degree of one of the control valves with a preset opening degree threshold to obtain a second judgment result; The prediction step is to predict whether the pipeline flow phenomenon is about to occur based on at least the first judgment result and the second judgment result. The method for predicting the occurrence of pipe flow in a blast furnace as described in claim 6, Wherein the second judgment result is to compare whether the current opening degree is greater than or equal to the preset opening degree threshold; The preset opening threshold is 60%, 65%, 75% or 80%. The method for predicting the occurrence of pipe flow phenomenon in a blast furnace as described in claim 1, further includes: Obtaining a highest two-layer pressure difference of the blast furnace, wherein the highest two-layer pressure difference is the difference between the current pressure value of the first blast furnace layer and the current pressure value of the second blast furnace layer; and Comparing the highest two-layer pressure difference with a preset pressure threshold to obtain a third judgment result; The prediction step is to predict whether the pipeline flow phenomenon is about to occur based on at least the first judgment result and the third judgment result. The method for predicting the occurrence of pipe flow phenomena in a blast furnace as described in claim 8, wherein the third judgment result is to compare whether the pressure difference between the highest two layers is greater than or equal to the preset pressure threshold; wherein the preset pressure threshold is 0.15 kg/cm ² or 0.2 kg/cm ² . The method for predicting the occurrence of pipe flow phenomenon in a blast furnace as described in claim 1, further includes: Comparing a blast furnace air volume of the blast furnace with a preset air volume threshold to obtain a fourth judgment result; The prediction step is to predict whether the pipeline flow phenomenon is about to occur based on at least the first judgment result and the fourth judgment result. The method for predicting the occurrence of a pipe flow phenomenon in a blast furnace as described in claim 10, wherein the fourth judgment result is to compare whether the air volume of the blast furnace is greater than or equal to the preset air volume threshold; wherein the preset air volume threshold is 2000 gaseous cubic meters /Min (Nm ³ /min) or 4000 Nm ³ /min. The method for predicting the occurrence of pipe flow phenomenon in a blast furnace as described in claim 1, further includes: Comparing a thermal load temperature of the blast furnace with a preset temperature threshold to obtain a fifth judgment result; The prediction step is to predict whether the pipeline flow phenomenon is about to occur based on at least the first judgment result and the fifth judgment result. The method for predicting the occurrence of pipe flow phenomenon in a blast furnace as described in claim 12, The fifth judgment result is to compare whether the heat load temperature is greater than or equal to the preset temperature threshold; The preset temperature threshold is 500 degrees Celsius (°C), 700°C, 800°C, or 1000°C.

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