TWI776567B - Method and system for monitoring walls of a blast furnace - Google Patents

Abstract

A method and a system for monitoring walls of a blast furnace are provided. The system includes plural temperature sensors and a process control system of the blast furnace. The blast furnace process control system is electrically connected to the temperature sensors, and configured to perform the method for monitoring walls of the blast furnace. The method for monitoring walls of the blast furnace includes: receiving plural furnace wall temperature data sets, in which the temperature data sets correspond to plural wall sections of the blast furnace in a one-to-one manner; calculating plural formed-block thickness values of the wall sections of the blast furnace in accordance with the furnace wall temperature data sets; determining if one of formed-block thickness values is greater than a predetermined thickness threshold value; calculating a sustained time period of the formed-block thickness value greater than the predetermined thickness threshold and determining if the sustained time period is greater than a predetermined sustained time threshold when the one of formed-block thickness values is greater than the predetermined thickness threshold value; and a warning message is sent when the sustained time period is greater than the predetermined sustained time threshold.

Description

Blast furnace wall monitoring method and system

The present invention relates to a method and system for monitoring a blast furnace wall. Especially about the monitoring method and system of blast furnace wall agglomeration.

Generally speaking, in the process of blast furnace ironmaking, there may be agglomerates on the blast furnace wall. From a theoretical point of view, the agglomeration of the furnace wall is caused by the circulation and deposition of alkali metals in the furnace. Alkali metals are usually present in mineral aggregates and coke ash as silicate complexes. When the charge reaches the high temperature zone of 1500°C, it will decompose, and at this time, most of the alkali metal oxides will be integrated into the slag, and a small part of the alkali metal vapor will rise with the airflow and contact the low temperature furnace wall to condense and deposit, and then Formation of lumps on the furnace walls.

Agglomeration on the furnace walls can affect furnace conditions, resulting in poor blast furnace output. What's more, the agglomerates can fall and damage equipment in the blast furnace, such as blower nozzles. Therefore, there is a need for a blast furnace wall monitoring method and system to monitor agglomeration on the blast furnace wall.

Embodiments of the present invention provide a blast furnace wall monitoring method and system, which can monitor the agglomeration on the blast furnace wall, and further adjust the blast furnace feed to reduce/reduce the agglomeration on the blast furnace wall.

According to an aspect of the present invention, the above-mentioned blast furnace wall monitoring method includes providing a plurality of pieces of furnace wall temperature data, wherein these furnace wall temperature data correspond to a plurality of blast furnace wall sections in a one-to-one manner; according to these furnace wall temperatures data to calculate a plurality of agglomeration thickness values corresponding to these blast furnace wall sections; determine whether one of these agglomeration thickness values is greater than a preset thickness threshold; when one of the agglomeration thickness values is greater than a preset thickness When the thickness threshold is used, calculate the duration of the cake thickness value greater than the preset thickness threshold, and determine whether the duration is greater than a preset duration threshold; and when the duration is greater than the preset duration threshold , a warning message is issued.

In some embodiments, the above-mentioned predetermined thickness threshold is 1000 millimeters (mm), and the predetermined duration threshold is 6 hours.

In some embodiments, in addition to the above-mentioned steps, the above-mentioned blast furnace wall monitoring method further includes: determining a layout angle parameter according to a heat load value and a heat load duration of the blast furnace; and controlling the blast furnace according to the layout angle parameter the cloth operation.

In some embodiments, the heat load value of the blast furnace is the heat load value of the belly of the blast furnace.

In some embodiments, the above-mentioned distribution angle parameters include distribution parameters of coke and iron ore.

According to another aspect of the present invention, the above-mentioned blast furnace wall monitoring system includes a plurality of temperature sensors and a blast furnace program control system. The temperature sensors are arranged in a plurality of blast furnace wall sections of the blast furnace to provide a plurality of furnace wall temperature data, wherein these furnace wall temperature data are corresponding to the blast furnace wall sections one-to-one. The blast furnace program control system is used to: receive the furnace wall temperature data; calculate a plurality of agglomerate thickness values corresponding to the blast furnace wall section according to the furnace wall temperature data; determine whether one of these agglomerate thickness values is greater than the preset thickness Threshold value; when one of the agglomeration thickness values is greater than the preset thickness threshold value, calculate a duration of the agglomeration thickness value greater than the preset thickness threshold value, and determine whether the duration time is greater than a preset duration time threshold; and when the duration is greater than the preset duration threshold, a warning message is issued.

In some embodiments, the above-mentioned temperature sensor is a thermocouple, the predetermined thickness threshold is 1000 mm, and the predetermined duration threshold is 6 hours.

In some embodiments, in addition to the above-mentioned steps, the above-mentioned blast furnace programming control system is further used to: determine the layout angle parameter according to a heat load value and a heat load duration of the blast furnace; and control the layout of the blast furnace according to the layout angle parameter material operation.

In some embodiments, one of the heat load values of the blast furnace is the heat load value of the hearth of the blast furnace.

In some embodiments, the above-mentioned distribution angle parameters include distribution parameters of coke and iron ore.

The terms "first", "second", .

Please refer to FIG. 1 , which is a schematic diagram of a blast furnace wall monitoring system according to an embodiment of the present invention. The blast furnace wall monitoring system includes a plurality of temperature sensors 110 and a blast furnace program control system 120 . The temperature sensors 110 are arranged in a plurality of furnace wall sections of the blast furnace 130 . In this embodiment, the temperature sensor 110 is a thermocouple, which is embedded in the furnace wall of the blast furnace to sense the temperature value of the corresponding furnace wall section. However, embodiments of the present invention are not limited thereto.

The blast furnace is divided into multiple layers S1~S8 according to the height, and each layer is divided into 8 sections according to the direction, such as the east section, the southeast section, the south section and so on. In this way, the entire blast furnace is divided into 8×8 sections, and the temperature sensors 110 are arranged in these 64 sections to measure the furnace wall temperature values of the 64 sections, and output the corresponding furnace wall temperature data to the blast furnace program control system 120 . However, embodiments of the present invention are not limited thereto. The blast furnace of the embodiment of the present invention is not limited to be divided into 8 layers, nor is it limited to be divided into 8 sections for each layer. Those skilled in the art can stratify the blast furnace according to actual needs, and partition each stratum to measure the temperature values of these sections.

The blast furnace program control system 120 is used for receiving the furnace wall temperature data sent by the temperature sensor 110, and monitoring the agglomeration condition of the blast furnace wall according to the furnace wall temperature data.

Please refer to FIG. 2 , which is a schematic flowchart of a blast furnace wall monitoring method 200 performed by the blast furnace program control system 120 . In the blast furnace wall monitoring method 200 , step 210 is first performed to receive a plurality of furnace wall temperature data sent by the temperature sensor 110 . Each furnace wall temperature data contains the temperature value of the corresponding blast furnace wall section. Then, step 220 is performed to calculate a plurality of agglomeration thickness values corresponding to the blast furnace wall section according to the above furnace wall temperature data. In an embodiment of the present invention, the blast furnace program control system 120 may use a user interface to display the value of the agglomeration thickness corresponding to the blast furnace wall section, as shown in FIG. 3 . In Figure 3, the blast furnace wall sections are represented by blocks S101~S108, S201~S208, S301~S308, S401~S408, S501~S508, S601~S608, S701~S708, and S801~ S808 to indicate.

Blocks S101 to S108 represent eight furnace wall sections in eight directions on the first floor S1 of the blast furnace. As mentioned above, the temperature sensors 110 are embedded in the eight furnace wall sections to sense the temperature values of the eight furnace wall sections of the first layer S1 and send them back to the blast furnace program control system 120, So that the blast furnace program control system 120 can calculate the corresponding agglomerate thickness value.

Blocks S201 to S208 represent eight furnace wall sections in eight directions on the second floor S2 of the blast furnace. As mentioned above, the temperature sensors 110 are embedded in the eight furnace wall sections to sense the temperature values of the eight furnace wall sections of the second layer S2 and send them back to the blast furnace program control system 120, So that the blast furnace program control system 120 can calculate the corresponding agglomerate thickness value.

Blocks S301 to S308 represent eight furnace wall sections in eight directions on the third floor S3 of the blast furnace. As mentioned above, the temperature sensors 110 are embedded in the eight furnace wall sections to sense the temperature values of the eight furnace wall sections of the third layer S3 and send them back to the blast furnace program control system 120 . So that the blast furnace program control system 120 can calculate the corresponding agglomerate thickness value.

Blocks S401 to S408 represent eight furnace wall sections in eight directions on the fourth floor S4 of the blast furnace. As mentioned above, the temperature sensors 110 are embedded in the eight furnace wall sections to sense the temperature values of the eight furnace wall sections of the fourth layer S4 and send them back to the blast furnace program control system 120 . So that the blast furnace program control system 120 can calculate the corresponding agglomerate thickness value.

Blocks S501 to S508 represent eight furnace wall sections in eight directions on the fifth floor S5 of the blast furnace. As mentioned above, the temperature sensors 110 are embedded in the eight furnace wall sections to sense the temperature values of the eight furnace wall sections of the fifth layer S5 and send them back to the blast furnace program control system 120 . So that the blast furnace program control system 120 can calculate the corresponding agglomerate thickness value.

Blocks S601 to S608 represent eight furnace wall sections in eight directions on the sixth floor S6 of the blast furnace. As mentioned above, the temperature sensors 110 are embedded in the eight furnace wall sections to sense the temperature values of the eight furnace wall sections of the sixth layer S6 and send them back to the blast furnace program control system 120, So that the blast furnace program control system 120 can calculate the corresponding agglomerate thickness value.

Blocks S701 to S708 represent eight furnace wall sections in eight directions on the seventh floor S7 of the blast furnace. As mentioned above, the temperature sensors 110 are embedded in the eight furnace wall sections to sense the temperature values of the eight furnace wall sections of the seventh layer S7 and send them back to the blast furnace program control system 120, So that the blast furnace program control system 120 can calculate the corresponding agglomerate thickness value.

Blocks S801 to S808 represent eight furnace wall sections in eight directions on the eighth floor S8 of the blast furnace. As mentioned above, the temperature sensors 110 are embedded in the eight furnace wall sections to sense the temperature values of the eight furnace wall sections of the eighth layer S8 and send them back to the blast furnace program control system 120, So that the blast furnace program control system 120 can calculate the corresponding agglomerate thickness value.

In FIG. 3 , the blast furnace programming control system 120 uses different color gradients to represent different agglomerate thickness values. For example, cake thickness values below 400 millimeters (mm) are indicated by a darker color, such as dark green. For another example, when the thickness of the agglomerate exceeds 400 mm, but is less than 460 mm, it is represented by a slightly lighter color, such as a slightly lighter green. For another example, when the thickness of the agglomerate exceeds 460 mm, but is less than 520 mm, it is represented by a lighter color, such as a lighter green. In this embodiment, the color gradient is changed in units of 60 mm, but the embodiment of the present invention is not limited to this.

In some embodiments, blocks S101 to S808 may also display the agglomerate thickness values of the corresponding blast furnace sections. Embodiments of the present invention are not so limited.

Referring back to FIG. 2 , in step 230 , it is determined whether one of the above-mentioned thickness values of agglomerates is greater than a predetermined thickness threshold. When one of the cake thickness values is greater than the predetermined thickness threshold, step 240 is performed to calculate a duration that the one of the cake thickness values is greater than the predetermined thickness threshold. For example, when an agglomeration thickness value is larger than a preset thickness threshold value at a time point, time accumulation is started to calculate the duration that the agglomeration thickness value is larger than the preset thickness threshold value.

Then, step 250 is performed to determine whether the duration of the cake thickness value greater than the predetermined thickness threshold value is greater than a predetermined duration time threshold value. When the duration of the agglomerate thickness value greater than the preset thickness threshold value is greater than the preset duration time threshold value, step 260 is performed to issue a warning message.

In this embodiment, the preset thickness threshold is 1000 mm, and the preset duration threshold is 6 hours. When the agglomeration thickness value of the blast furnace section exceeds 1000 mm and the duration condition of 6 hours is satisfied, the blast furnace program control system 120 will issue a warning message, such as a text message, a light message or a color message. As shown in FIG. 3 , when the agglomeration thickness value of the blast furnace section corresponding to the blocks S202, S203 and S303 exceeds 1000 mm, and the duration condition of 6 hours is satisfied, the blast furnace program control system 120 can flash or add a flash on the border of the block. The blocks S202, S203, and S303 are displayed in a way of adding a specific color to give a warning. In this way, when the blast furnace programmer observes that a block starts to flash or has a specific color border, it can be clearly understood that some sections of the blast furnace have agglomerate thickness values that exceed the standard. However, embodiments of the present invention are not so limited.

In some embodiments, corresponding treatment can also be performed for the blast furnace section exceeding the preset thickness threshold of agglomeration, for example, adjusting the feed of the blast furnace to reduce/reduce the agglomeration on the blast furnace wall. For example, a heat load value of one of the blast furnaces is calculated, and different distribution angle parameters are provided according to the heat load value and the heat load duration to control the distribution operation of the blast furnace to eliminate agglomeration.

Please refer to FIG. 4 , which shows that the blast furnace program control system 120 performs different distribution operations on the blast furnace under different heat load conditions. For example, the blast furnace program control system 120 will calculate the heat load value of the blast furnace belly, and according to the set heat load interval and duration, the system will automatically guide the set angle parameters according to the satisfied conditions. The heat load value of the blast furnace waist can be calculated and obtained through, for example, the information of blast furnace cooling water (water temperature, flow rate, etc.). As shown in FIG. 4 , in this embodiment, a total of 6 different cloth angle parameter groups No. 1 to No. 6 are provided to control the cloth operation of the blast furnace, wherein different cloth angle parameter groups include different coke/iron ore cloths material parameters. Specifically, each set of distribution parameters includes the number of coke/iron ore distribution cycles, which correspond to 1 to 12 distribution positions (determined according to the angle of the distribution trough). For example, in the No. 1 distribution parameter group, the number of coke distribution turns corresponding to the second distribution position is 4, and the number of iron ore distribution corresponding to the second distribution position is 3 turns. For another example, in the No. 1 distribution parameter group, the number of coke distribution turns corresponding to the fifth distribution position is 2, and the number of iron ore distribution corresponding to the fifth distribution position is 2 turns. . No. 1 to No. 6 angle parameter groups can correspond to different blast furnace ventilation. Specifically, the ventilation properties are ranked as follows: No. 6, No. 5, No. 4, No. 3, No. 2, and No. 1. Among them, the No. 6 cloth angle parameter group has higher peripheral ventilation (stronger peripheral airflow), which is conducive to eliminating agglomeration on the furnace wall. This is because the coke is arranged in the outer position, and the coke has a larger particle size and higher structural strength.

As shown in FIG. 4 , when the heat load value of the blast furnace waist is less than 600 million cal/h (MCal/h), and the duration exceeds 2 or 4 hours, the blast furnace program control system 120 sets the No. 6 distribution parameter group To control the blast furnace cloth operation. When the heat load value of the blast furnace waist is between 600MCal/h and 700MCal/h, and the duration exceeds 2 or 8 hours, the blast furnace program control system 120 sets the No. 5 distribution parameter group to control the distribution operation of the blast furnace . When the heat load value of the blast furnace waist is between 700MCal/h and 1200MCal/h, and the duration exceeds 4 or 8 hours, the blast furnace program control system 120 sets the No. 4 distribution parameter group to control the distribution operation of the blast furnace . When the heat load value of the blast furnace waist is between 1200MCal/h and 1700MCal/h, and the duration exceeds 6 or 8 hours, the blast furnace program control system 120 sets the No. 3 distribution parameter group to control the distribution operation of the blast furnace . When the heat load value of the blast furnace waist is between 1700MCal/h and 2200MCal/h, and the duration exceeds 4 or 8 hours, the blast furnace program control system 120 sets the No. 2 distribution parameter group to control the distribution operation of the blast furnace .

It is worth mentioning that when the heat load value of the blast furnace waist is greater than 2200MCal/h, and the duration exceeds 2 hours (but not more than 4 hours), the blast furnace program control system 120 sets the No. 2 distribution parameter group to control the blast furnace. cloth operation. When the duration exceeds 4 hours, the blast furnace program control system 120 sets the No. 1 distribution parameter group to control the distribution operation of the blast furnace.

As can be seen from the above description, the blast furnace wall monitoring method and system according to the embodiments of the present invention monitor the agglomeration condition of the blast furnace wall by measuring the temperature of the blast furnace wall and provide warnings to blast furnace operators in time. Furthermore, in the blast furnace wall monitoring method and system according to the embodiment of the present invention, different distribution parameters can be set to control the distribution operation of the blast furnace, and the ventilation in the blast furnace can be adjusted with different coke/iron ore configurations to control the blast furnace. The size of the agglomeration on the furnace wall to avoid the agglomeration on the furnace wall affecting the poor output of the blast furnace or damaging the equipment in the blast furnace.

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

110: temperature sensor 120: Blast Furnace Program Control System 130: Blast Furnace 200: Blast Furnace Wall Monitoring Method 210~260: Steps S1~S8: Layer S101~S808: Blocks

FIG. 1 is a schematic diagram illustrating a blast furnace wall monitoring system according to an embodiment of the present invention. FIG. 2 is a schematic flow chart illustrating a method for monitoring a blast furnace wall performed by a blast furnace program control system according to an embodiment of the present invention. FIG. 3 is a block diagram showing the thickness of agglomerates according to an embodiment of the present invention. FIG. 4 is a schematic diagram illustrating a blast furnace layout angle parameter according to an embodiment of the present invention.

none

200: Blast Furnace Wall Monitoring Method

210~260: Steps

Claims (8)

A blast furnace wall monitoring method, comprising: providing a plurality of furnace wall temperature data, wherein the furnace wall temperature data corresponds to a plurality of blast furnace wall sections in a one-to-one manner; calculating the furnace wall temperature data according to the furnace wall temperature data a plurality of agglomeration thickness values corresponding to some blast furnace wall sections; determine whether one of the agglomeration thickness values is greater than a preset thickness threshold; when the one of the agglomeration thickness values is greater than the preset thickness When the threshold is used, calculate a duration of the agglomeration thickness values greater than the preset thickness threshold, and determine whether the duration is greater than a preset duration threshold; and when the duration is greater than the preset thickness When the duration threshold is set, a warning message is issued; wherein the preset thickness threshold is 1000 millimeters (mm), and the preset duration threshold is 6 hours. The blast furnace wall monitoring method as claimed in claim 1, further comprising: determining a distribution angle parameter according to a heat load value and a heat load duration of the blast furnace; and controlling the distribution of the blast furnace according to the distribution angle parameter operate. The blast furnace wall monitoring method according to claim 2, wherein the heat load value of the blast furnace is the heat load value of the belly of the blast furnace. The blast furnace wall monitoring method according to claim 2, wherein the distribution angle parameter includes distribution parameters of coke and iron ore. A blast furnace wall monitoring system, comprising: a plurality of temperature sensors arranged in a plurality of blast furnace wall sections of the blast furnace to provide a plurality of pieces of furnace wall temperature data, wherein the furnace wall temperature data are one-to-one corresponding to the blast furnace wall sections; and a blast furnace program control system for: receiving the furnace wall temperature data; calculating a plurality of blast furnace wall sections corresponding to the blast furnace wall sections according to the furnace wall temperature data agglomeration thickness value; determine whether one of the agglomeration thickness values is greater than a preset thickness threshold; when the agglomeration thickness value is greater than the preset thickness threshold, calculate the agglomeration thickness values which is greater than a duration of the preset thickness threshold, and determine whether the duration is greater than a preset duration threshold; and when the duration is greater than the preset duration threshold, issue a warning message; The temperature sensors are thermocouples, the preset thickness threshold is 1000 mm, and the preset duration threshold is 6 hours. The blast furnace wall monitoring system according to claim 5, wherein the blast furnace program control system is further used for: determining a layout angle parameter according to a heat load value and a heat load duration of the blast furnace; and to determine a layout angle parameter according to the layout angle parameter Controls the cloth operation of this blast furnace. The blast furnace wall monitoring system according to claim 6, wherein the heat load value of the blast furnace is the heat load value of the belly of the blast furnace. The blast furnace wall monitoring system according to claim 6, wherein the distribution angle parameters include distribution parameters of coke and iron ore.

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