KR100620100B1 - System and Method for Air Gap Detecting of Downward Part in Blast Furnace Hearth - Google Patents

Abstract

The present invention can accurately grasp the position of the voids generated in the bottom of the blast furnace to improve the efficiency of the press-in operation, and also to extend the life of the blast furnace according to the sound management of the bottom of the blast furnace, and also to expand the voids in the blast furnace It is related with the pore position detection system at the bottom of the blast furnace and the detection method using the same to prevent the accident of large-scale accidents due to the burnt out of the molten iron inside the blast furnace due to the loss of carbon smoke layer. .

The present invention includes a detection sensor, one end of which is inserted into the bottom of the blast furnace to simultaneously measure the temperature and gas pressure of the shell, stamp layer and carbon lead layer; Reads and stores temperature signals transmitted through a plurality of cables connected to the other ends of the plurality of detection sensors, and obtains the temperature standard deviation appearing at a certain position at the bottom of the blast furnace based on the stored temperature data and displays the change over time in real time. Characterized in that the data logging means.

Blast furnace, air gap, indentation, detection device

Description

Air gap detection system at the bottom of blast furnace and detection method using the same {System and Method for Air Gap Detecting of Downward Part in Blast Furnace Hearth}

1 is a schematic cross-sectional view showing a state in which the indentation device is disposed at the bottom of the blast furnace for the indentation operation;

Figure 2a is a schematic diagram showing a plurality of void detection system according to the present invention,

Figure 2b is a schematic diagram showing a state in which a plurality of air gap detection system installed in the blast furnace,

Figure 3 is a schematic diagram showing a detection sensor of the air gap detection system of the blast furnace bottom according to the present invention,

4A and 4B are graphs showing the temperature standard deviations of the stamp layer in the absence of voids and in the presence of voids detected through the void detection system according to the present invention, respectively;

5 is a graph showing the temperature change distributed in the bark and stamp layer detected through the air gap detection system according to the present invention.

* Description of symbols on the main parts of the drawing *

1: furnace wall 1a-1d: 1st-4th exits

3: iron strip 5: stamp layer

7: carbon lead layer 9: void

10: press-fit device 11: press-fit material

20: detection sensor 20a: temperature detector

20b: pressure detector 21: guide pipe

23a to 23c: first to third thermocouples 25a: gas discharge pipe

25b: pressure gauge 25c: check valve

25d: gas inlet hole 30: cable

31: Junction box 40: Data logging device

41: recorder section 43: memory section

45: calculator 47: display

The present invention relates to a pore position detection system of the bottom of the blast furnace and a detection method using the same, in particular, to accurately grasp the position of the voids generated in the bottom of the blast furnace to improve the efficiency of the indentation work and to manage the bottom of the blast furnace soundly As a result, the life of the blast furnace can be extended, and as the pores inside the blast furnace are enlarged and the carbon flakes are lost, the molten iron inside the blast furnace is leaked to the outside to prevent workers from being burned or accidents caused by fire. The present invention relates to a pore position detection system at the bottom of a blast furnace and a detection method using the same.

In general, a blast furnace is a high-temperature, high-pressure reactor capable of obtaining molten iron by charging iron ore and coke through a furnace and reducing / melting iron ore by hot air supplied from the bottom of the blast furnace.

Such blast furnaces form a plurality of outlets at the bottom of the blast furnace in order to discharge the molten molten iron to the outside at regular intervals.

As shown in FIG. 1, the furnace wall 1 of the blast furnace forms an iron shell 3 having a thickness of approximately 60 to 70 mm on the outermost side, and a carbon lead layer 7 having a thickness of about 2 m is formed inside the iron shell. .

In this case, a stamp layer 5 composed mainly of a carbon hop composite containing carbon as a main component (about 70%) is formed between the bark 3 and the carbon lead layer 7. When the blast furnace is operated through elasticity, it acts as a buffer against thermal expansion generated in the shell 3 and the carbon lead layer 7 by high temperature, and at the same time, heat transfer is performed to reduce thermal fatigue of the carbon lead layer 7. It is functioning to make it smooth.

By the way, such a stamp layer 5 contains a volatile component, and when the heat is received, the void 9 is generated while the volatile component vaporizes.

As such, when the voids 9 are generated, heat transfer of the carbon lead layer 7 to the iron fatigue is not performed smoothly. As a result, the temperature of the carbon lead layer 7 rises, resulting in thermal fatigue of the carbon lead layer 7. Not only is the phenomenon increased, but deposits adhered to the surface of the blast furnace inner side of the carbon lead layer 7 easily drop off, thereby promoting mechanical and chemical erosion with the carbon lead layer.

In this way, when a hole is formed in the portion where the carbon lead layer is eroded, the hot molten iron contained in the blast furnace flows out of the blast furnace through the stamp layer 5 and the shell 3, thereby working around the blast furnace. There was a problem that could threaten the lives of the workers who are doing, as well as causing a large fire.

In order to prevent this, the voids are detected in advance, and the pores 9 of the amorphous refractory indentation material 11, ie, carbon paste or heavy oil, are injected into the bottom of the blast furnace at the position where the voids exist, as shown in FIG. 1. It will work to fill.

However, in order to fill the gap properly, it is necessary to select the exact position of the gap existing inside the bottom of the blast furnace in order to set the inlet of the press-fit device 10.

Therefore, since the blast furnace of high temperature and high pressure currently does not have the equipment which can observe the inside, Japanese Patent Laid-Open No. 64-74444, Japanese Patent Laid-Open No. 63-295909, and Japanese Patent Laid-Open No. 58 are conventionally used as a method of detecting voids. -27002, Japanese Laid-Open Patent Publication No. 58-127162 and Japanese Laid-Open Patent Publication No. 3-255953, using ultrasonic waves or vortices disclosed in Korean Laid-Open Patent Publications 83-9483 and 2000-128181 There was a non-destructive method by current.

By the way, when detecting voids using ultrasonic waves, ultrasonic waves are absorbed by a very thick iron plate of 60 to 70 mm formed on the outermost side of the blast furnace, so that the attenuation is very large, and it is very difficult to obtain the reflected wave. In the case of using, similarly, the measurement of capacitance is hardly made due to the thick bark, which makes it difficult to employ in actual field.

Therefore, in the field, it is very difficult to accurately detect the location of the air gap by using a separate equipment or the like. Therefore, the air gap is mainly generated around the exit port where the molten iron is discharged. According to the experience of operation, that is, when the hot gas permeated into the pores according to the time or the occurrence of the pores is discharged to the outside of the blast furnace, it is inevitably determined by the smell of the worker.

Accordingly, if the position of the pore is inserted without the exact position of the pore, the approximate pore position is estimated and the press-fit device 10 is installed in the blast furnace to penetrate the steel bar. In case of inaccuracy, the press-fitting material is not filled and the press-fit device 10 is released from the furnace wall 1, and the press-fitting position is again set and reworked.

In addition, if the indentation hole is formed in the bottom edge of the furnace due to the wrong position during the press-in operation, the steel bar surrounding the outside of the blast furnace can not be managed soundly, there was a problem that shorten the life of the blast furnace as a whole.

An object of the present invention for solving the above problems is to accurately grasp the position of the voids generated in the bottom of the blast furnace to improve the efficiency of the press-fitting operation and also to extend the life of the blast furnace by managing the bottom of the blast furnace soundly. In addition, as the pores inside the blast furnace are enlarged and the carbon lead layer is lost, the molten iron inside the blast furnace leaks to the outside, which can prevent workers from being burned or a large accident due to fire. The present invention provides a position detection system and a detection method using the same.

In order to achieve the above object, the present invention comprises: a detection sensor, one end of which is inserted into the bottom of the blast furnace to simultaneously measure the temperature and gas pressure of the shell, stamp layer and carbon lead layer; Reads and stores temperature signals transmitted through a plurality of cables connected to the other end of the plurality of detection sensors, and obtains the temperature standard deviation appearing at a certain position of the bottom of the blast furnace based on the stored temperature data, and changes them over time. It provides a gap detection system of the bottom of the blast furnace, characterized in that consisting of data logging means for displaying in real time.

In this case, the detection sensor is a guide pipe which is inserted into the carbon lead layer through the iron shell and the stamp layer of the blast furnace in turn, and inserted into the guide pipe, the length reaching the shell, stamp layer and carbon lead layer, respectively A temperature detecting unit having three thermocouples; The pressure of the gas discharged tube inserted into the stamp layer from the outside of the blast furnace, the pressure gauge provided on the other end of the gas discharge tube and the pressure gauge in front of the pressure gauge, when the gap between the shell and the stamp layer occurs, When the level is reached, it consists of a pressure detection section consisting of a check valve for discharge to the outside.

Furthermore, the data logging means includes a recorder unit reading temperature signals transmitted through a plurality of cables connected to the other ends of the plurality of detection sensors at intervals of 10 seconds, and storing the temperature signals collected through the recorder unit as temperature data. A calculation unit for sampling the temperature data stored in the memory unit, and one temperature per 10 minutes to obtain a temperature standard deviation appearing at a position where a plurality of detection sensors are installed at the bottom of the blast furnace; and at each position obtained through the operation unit. It is composed of a display unit that displays the change over time of the temperature standard deviation in real time so that the operator can be informed that there is a void when the temperature standard deviation value rises by 4 or more.

In addition, according to another feature of the invention, the step of arranging a plurality of detection sensors for continuously detecting the temperature of the blast furnace bark, stamp layer and carbon yeonwa layer around the plurality of outlets that the molten iron is discharged to the bottom of the blast furnace; Reading the temperature signals transmitted through the plurality of detection sensors at intervals of 10 seconds through the recorder unit and storing the temperature signals as temperature data in the memory unit, and storing the respective temperature data stored in the memory unit in the operation unit per 10 minutes. Sampling one piece of data to obtain a temperature standard deviation, and the presence of air gaps when the temperature standard deviation increases by four or more through a real-time temperature change of a portion of the blast furnace equipped with a plurality of temperature detection sensors. Displaying the change over time of the temperature standard deviation obtained by the calculation unit in real time to inform the operator. It provides a gap detection method of the bottom of the blast furnace, characterized in that.

In this case, the air gap detection method of the bottom of the blast furnace according to the present invention is filled with the gas generated inside the blast furnace by the voids generated between the shell and the stamp layer along the gas discharge pipe inserted from the outside of the blast furnace to the stamp layer. It further comprises a gas discharge step for informing the operator of the presence of the gap to discharge the.

Therefore, the present invention as described above detects / analyzes and displays the temperature standard deviation of the bottom of the blast furnace stamp layer, and at the same time, it is possible to easily grasp the pore position of the bottom of the blast furnace according to the fluctuation of the pressure gauge. In addition to maximizing efficiency, it is possible to reduce the number of misperforated indentation holes caused by misdiagnosis of the location of the pores of the low edge of the blast furnace due to misdiagnosis, thereby extending the life of the blast furnace.

(Example)

Hereinafter, with reference to the accompanying drawings the pore position detection system and the detection method using the same according to the present invention as follows.

Figure 2a is a schematic diagram showing a plurality of pore detection system according to the present invention, Figure 2b is a schematic diagram showing a state in which a plurality of pore detection system according to the present invention is installed in the blast furnace, Figure 3 is a bottom portion of the blast furnace according to the present invention It is a schematic diagram which shows the detection sensor of a space | gap detection system.

First, the pore position detection system of the bottom of the blast furnace according to the present invention is installed in the bottom of the furnace wall 1 of the blast furnace represented in the unfolded state, as shown in Figure 2b, in particular around the first to fourth outlets (1a to 1d) It is provided with a plurality of detection sensors 20 for detecting the temperature of the position to transmit the temperature signal to the outside and at the same time inform the gas pressure value of the position installed.

Also, as shown in FIG. 2A, a junction box 31 for tying a plurality of cables 30 drawn out to transfer temperature signals from the plurality of detection sensors 20 into one is safe from cooling water sprayed on the bottom of the blast furnace. Place it outside the spray range of the coolant.

In addition, the temperature signals received through the plurality of cables 31 are stored at regular intervals, and based on the analysis of the temperature distribution of the position where the detection sensor 20 is installed by a predetermined time unit to display them as the temperature standard deviation A data logging device 40 is provided.

The structure of the detection sensor 20 and the data logging device forming the air gap detection system according to the present invention will be described in more detail with reference to the accompanying drawings.

First, as shown in FIG. 1, when the voids 9 are generated in the stamp layer 5 existing between the shell 3 and the carbon lead layer 7, the gas generated inside the blast furnace is significantly degraded. It is permeated into the voids 9 so that the temperature changes suddenly with respect to the entire furnace wall and at the same time there is a gas pressure.

The detection sensor 20 is thus aware of the fact that a void has occurred, that is, the presence of a temperature detector 20a and a pressure for detecting the temperature, focusing on the sudden temperature change and the presence or absence of pressure present in the void portion. Consists of a pressure detector 20b for grasping.

As shown in FIG. 3, the temperature detector 20a includes a guide pipe 21 having one end penetrated through the bottom of the blast furnace bottom 3 and the stamp layer 5, and inserted into the carbon lead layer 7. The inside of the guide pipe 21 is guided to the guide pipe 21 to detect the temperature of the shell 3, the stamp layer 5 and the carbon lead layer 7 in real time so that the tip is stamped with the shell 3, stamp. First to third thermocouples 23a, 23b, and 23c respectively inserted into the layer 5 and the carbon lead layer 7 are inserted.

In addition, the pressure detection unit 20b is a gas discharge pipe 25a inserted into the carbon pontoon layer 7 along one side of the guide pipe 21 to the outside of the guide pipe 21 and the gas discharge pipe when the gas becomes a constant pressure. It consists of a check valve 25c for discharging through 25a and a pressure gauge 25b for displaying the gas pressure of the air gap.

At this time, the gas discharge pipe (25a) is a check valve when the gas generated in the blast furnace flows into the gap generated between the shell 3 and the stamp layer (5) or in the stamp layer (5) and carbon lead layer (7) When a predetermined pressure is reached by 25c, a plurality of gas inlet holes 25d are formed in portions inserted into the stamp layer 5 and the carbon convex layer 7 so that the gas can be discharged to the outside through the gas discharge pipe 25a. Formed.

In this case, normally the indicated value of the pressure gauge 25b is close to 0, but when this value rises above a certain pressure and the gas is discharged through the check valve 25c, the worker passes through the pressure gauge 25a. It can be easily understood that voids are generated in the stamp layer 5 or the carbon lead layer 7.

Meanwhile, the data logging device 40 is transmitted through a plurality of cables 31 connected to the first to third thermocouples 23a, 23b, and 23c of the plurality of pore detection sensors 20, as shown in FIG. 2A. A recorder section 41 for reading a temperature signal is provided.

In addition, the operation unit for storing the temperature data collected through the recorder unit 41 in the memory unit 43 and obtains the temperature standard deviation of the predetermined position of the blast furnace furnace wall based on the temperature data so that the operator can easily determine whether there is a gap ( 45) and a display unit 47 which displays in real time the change in temperature standard deviation obtained through the calculation unit 45 in real time.

Referring to the operation and effects of the blast furnace bottom detection system according to the present invention made in this way as follows.

First, the plurality of detection sensors 20 are mainly located at the lower portions of the first outlet opening 1a and the third outlet opening 1c having a high porosity generation rate, for example, six positions of seven stages and eight stages of the furnace wall as shown in FIG. 1A, 1B, 1C, 3A, 3B, and 3C) (S1).

The temperature signals transmitted through the temperature detection unit 20a of the plurality of detection sensors 20 installed as described above are read at intervals of 10 seconds through the recorder unit 41 and stored in the memory unit 43 as temperature data. (S2).

For each temperature data stored in the memory unit 43, one piece of data is sampled every 10 minutes, and the calculation unit 45 calculates a temperature standard deviation of the position of each detection sensor 20 based on this data (S3).

The temporal change of the temperature standard deviation obtained so that an operator can monitor the temperature standard deviation with respect to the installed portion of each detection sensor 20 is displayed in real time through the display unit 47 (S4).

Therefore, the operator can easily and accurately determine whether the air gap is generated when a change in the temporal standard deviation of the temperature standard deviation with respect to the expected air gap generation part provided in real time through the display unit 47 is detected at a predetermined value or more.

In addition, when the gas generated inside the blast furnace is filled with voids generated between the stamp layer 5 from the outside of the blast furnace, the gas is discharged through the check valve 25c at a constant pressure (S5), The operator can grasp the gas discharged together with the pressure value indicated by the pressure gauge 25b to determine that a void exists.

4A and 4B are graphs respectively showing temperature standard deviations of stamp layers in a state in which there is no air gap at the bottom of the blast furnace detected by the air gap position detecting device according to the present invention, and in which air gaps exist.

FIG. 4 obtained through the above-described pore detection method shows the temperature detected in the stamp layer 5 detected at the "3B" position of the exit port 1c for about two months from the end of November to the beginning of February. A graph showing the standard deviation (STD).

In FIG. 4, the standard deviation with respect to temperature is mostly represented as 2 or less, and is stably distributed. In addition, the indicated pressure of the pressure gauge 25b is detected to be close to 0. Accordingly, no gap exists at the “3B” position. You can judge.

In contrast, FIG. 5 obtained by measuring at the same time as FIG. 4 is a graph showing a standard deviation (STD) of temperature detected in the stamp layer 5 detected at the “1B” position of the first exit port. The maximum value of the standard deviation was 6, and around January 16 was found to be about 8 or more, and the indicated pressure of the pressure gauge 25b increased.

As such, it can be predicted that there is a void at the "1B" position when the standard deviation value is higher than 4 and frequently, and furthermore, when a high pressure is detected or gas is discharged.

5 is a graph showing the temperature change distributed in the bark and stamp layer detected through the air gap detection system according to the present invention.

As described above, FIG. 5 shows the temperature for each thickness direction of the "1B" position where pores are expected to exist, and around January 15, the temperature of the stamp layer is about 90 ° C to 120 ° C, and the temperature of the bark is about 90 ° C. It rapidly rose from 60 ° C to 110 ° C and then decreased.

This phenomenon is a time when the temperature standard deviation value of the stamp layer 5 is kept high as shown in FIG. 4B. Here, it is determined that the temperature of the stamp layer 5 and the shell 3 is increased due to the detection of the thermocouple while the gas inside the furnace is discharged out of the furnace through the voids.

Subsequently, after about 15 January, the indentation material was injected into the pores by the indentation apparatus at the position “1B”, which is expected to be a pore occurrence portion, as shown in FIG. 5, and then, as shown in FIG. This was reduced to the usual level before the occurrence and the indication value of the pressure gauge was also reduced, as shown in Figure 4b the temperature standard deviation value of the stamp layer was also reduced to the usual level.

In other words, these results show that the indentation material injected into the found pores performs the role of heat transfer in the furnace direction through the carbon enamel layer in the furnace, and particularly, the temperature of the portion where the pores existed is rapidly reduced. It can be seen that.

Therefore, by precisely detecting the position of the voids generated in the bottom of the blast furnace, the press-fitting operation can be efficiently performed, and by reducing the number of indentation holes to be drilled through uselessly by judging the incorrect position of the voids, It can be managed soundly.

Meanwhile, in the present embodiment, the number of the detection sensors 20 is limited to six and disposed on the furnace wall of the blast furnace, but the present invention is not limited thereto, and the number of the detection sensors is increased to allow more accurate detection of pore generation positions.

As described above, the present invention detects and displays the temperature standard deviation of the blast furnace bottom stamp layer, and at the same time, it is possible to easily grasp the pore position of the bottom of the blast furnace according to the fluctuation of the pressure gauge, so that the efficiency of the indentation work on the void part is improved. In addition to maximizing, as well as reducing the number of indentation holes drilled at the bottom of the blast furnace due to the incorrect pore position determination has the advantage of extending the life of the blast furnace.

The present invention has been shown and described with reference to specific embodiments by way of example, but the present invention is not limited to the above-described embodiments, and those of ordinary skill in the art to which the present invention pertains without departing from the spirit of the present invention. Various changes and modifications will be possible.

Claims (5)

A detection sensor having one end inserted into the bottom of the blast furnace to simultaneously measure the temperature and gas pressure of the shell, stamp layer and carbon lead layer; A recorder unit for reading a temperature signal transmitted through a plurality of cables respectively connected to the other ends of the plurality of detection sensors; A memory unit for storing the temperature signal collected through the recorder unit as temperature data; A calculation unit for sampling the temperature data stored in the memory unit to obtain a temperature standard deviation appearing at a position where a plurality of detection sensors of the blast furnace bottom are installed; Display to show the temporal change of temperature standard deviation in real time so that the operator can be informed that the air gap exists when the temperature standard deviation value for each position obtained by the calculation unit rises by 4 or more. The air gap detection system of the bottom of the blast furnace, characterized in that it comprises a ;; The method of claim 1, wherein the detection sensor A guide pipe having a tip inserted through the blast furnace shell and the stamp layer in turn and inserted into the carbon lead layer, and three thermocouples inserted into the guide pipe and having a length reaching the iron shell, the stamp layer and the carbon lead layer, respectively. A temperature detector; The pressure of the gas discharge pipe inserted into the stamp layer from the outside of the blast furnace, the pressure gauge provided on the other end of the gas discharge pipe and the pressure gauge is provided in front of the pressure gauge, when the air gap between the shell and the stamp layer occurs, The air gap detection system of the bottom of the blast furnace, characterized in that the pressure detection unit consisting of a check valve for discharging to the outside when the level. delete Arranging a plurality of detection sensors for continuously detecting the temperature of the blast furnace shell, the stamp layer and the carbon lead layer, around the plurality of exit ports from which molten iron is discharged to the bottom of the blast furnace; Reading the temperature signals transmitted through the plurality of detection sensors at intervals of 10 seconds through the recorder unit and storing them as temperature data in the memory unit, respectively; Sampling each piece of data stored in the memory unit through a calculation unit for 10 minutes to obtain a temperature standard deviation thereof; The temporal change of the temperature standard deviation obtained by the calculating unit to inform the operator that a gap exists when the temperature standard deviation value rises by 4 or more through a real-time temperature change of a part of the blast furnace in which the plurality of temperature detection sensors are installed. The gap detection method of the bottom of the blast furnace, characterized in that consisting of displaying in real time. The air gap between the shell and the stamp layer is filled with gas generated inside the blast furnace along the gas discharge pipe inserted from the outside of the blast furnace to the stamp layer to discharge the gas. Air gap detection method of the bottom of the blast furnace, characterized in that it further comprises a gas discharge step for notifying the operator.

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