KR20130069027A - Detector of stave for furnace and lookout system of stave using by it - Google Patents

Abstract

PURPOSE: A furnace stave cooler detection unit and a furnace stave cooler monitoring device are provided to enhance reliability according to wear detection and to accurately measure wearing state of the stave cooler. CONSTITUTION: A furnace stave cooler detection unit comprises a supply tube (23), a stave cooler main body (22), a discharge pipe (24), and a detector (31). A water jacket part is prepared inside the stave cooler main body for furnace cooling. The supply tube supplies cooling water to the water jacket part by being combined with the stave cooler main body. The discharge pipe ejects cooling water of the water jacket part. The detector irradiates front side of the stave cooler with ultrasound or electromagnetic wave in order to measure the thickness of the stave cooler.

Description

Blast furnace cooler detection unit and blast furnace cooler monitoring device using the same {Detector of stave for furnace and lookout system of stave using by it}

The present invention relates to a blast furnace stave monitoring system, and more particularly, a blast furnace stave detection unit and a blast furnace stave monitoring system using the same, which can detect the thickness of the stave in the blast furnace (stave) and the leakage state of the stave, etc. It is about.

In general, blast furnaces are charged with ore and coke charges from the top of the blast furnace, and the hot blast of hot air is blown from the bottom of the blast furnace to combust them. It is.

This process occurs by continuous operation, and the ore and coke continuously injected from the upper part of the blast furnace are lowered by rubbing the ore and the coke continuously by the reduction and melting in a certain part of the tuft. Such friction causes wear and break of the stave. If the stave continues to wear or break, the protection of the stave is reduced and the heat load applied to the inner wall of the blast furnace increases, which leads to cracking in the blast furnace inner wall.

In addition, the coolant circulating inside the stave may be introduced into the blast furnace due to the wear or breakage of the stave. The inflow of coolant into the blast furnace lowers the temperature of the blast furnace below the set temperature, leading to fluctuations in fuel costs and instability of the furnace.

Therefore, it is necessary to periodically check the remaining thickness of the stave, and perform the maintenance work of the stave according to the measured value of the remaining thickness of the stave.

In Korean Patent No. 10-0812167, a stave thickness measuring device is disclosed. The stave thickness measuring device includes a base having a rear handle and an upper handle installed thereon, a guide rod installed on the base, a stator provided at an end of the guide rod and having a locking protrusion at a distal end thereof, and a movable member movable to the guide rod. And, the front end is provided with a measuring bar installed on the front end of the base and the moving bar installed on the front end of the base piece, the measuring member is movable to the measuring member. However, the stave thickness measuring device has a disadvantage in that the operation of the blast furnace must be stopped and measured in order to measure the remaining thickness of the stave, and the operator has to manually measure all the staves.

Publication No. 2011-0076422 discloses a method and device for measuring stave thickness in molten iron, and Publication No. 2011-050990 discloses a device for measuring thickness of a blast furnace.

The apparatus for measuring the thickness of the published blast furnace can be inserted into a hole for measuring the thickness of the copper layer provided in the blast furnace, and is provided with a through-hole penetrated in the longitudinal direction and made of a conductor, the hole provided in the first member. A second member made of a conductor and connected to the conductive layer of the first member and the second member, the resistance being generated between the first member and the conductive layer of the second member, Includes a resistance meter.

In the conventional stave thickness measuring device, since the resistance value changes according to a change in temperature, accurate calculation of the measured value is not easy.

Republic of Korea Patent Publication No. 2011-0035076 discloses a stave with insulated wire and blast furnace body thickness measuring system using the same, and Republic of Korea Patent Publication No. 2011-0019668 discloses a blast furnace cooling system having a stave wear measurement means Posted.

Patent No. 7218150 discloses a device for measuring stave wear of a stave blast furnace, and Patent No. 0812167 discloses a stave thickness measuring device.

The conventional stave wear amount or thickness measuring device is not in high reliability by directly contacting and detecting the wear amount.

On the other hand, since the copper stave has a structure in which a cooling pipe is formed in the stave main body and then separately produced and connected to the water supply and drain pipe of the stave main body, the copper stave has a welded portion adjacent to the stave main body. The welding part near the stave main body in this copper stave cooler has thermal expansion difference between the blast furnace inner side of the stave main body exposed to high temperature in the blast furnace operation, and the steel skin side of the stave main body to be cooled and radiated, When stress is generated due to the displacement caused by the heat shrinkage difference, it becomes a stress concentration part, and a fatigue crack occurs at this site, which causes shortening of the life of the stave cooler.

When the welding part of the stave clutter is damaged or the stave cooler is damaged, the pressure in the blast furnace is reversely introduced into the stave cooler. This inflow of gas has a problem that cannot be detected by the conventional measuring apparatus as described above.

The present invention is to solve the problems described above, it is possible to accurately measure the wear state of the stave cooler, blast furnace stave cooler detection unit that can improve the reliability according to the amount of wear detection and blast furnace stave cooler using the same Its purpose is to provide a surveillance system.

Another object of the present invention is to provide a blast furnace stave cooler monitoring system capable of detecting the pressure in the blast furnace to enter the cooling water circulation line of the stave.

In order to achieve the above object, the blast furnace stave cooler detection unit of the present invention is a stave cooler main body having a water jacket part provided therein for cooling the blast furnace, and a supply pipe coupled to the stave cooler main body to supply cooling water to the water jacket part. Discharge pipe for discharging the coolant in the water jacket portion,

It is installed on the back of the stave cooler main body or installed on one side of the supply pipe or discharge pipe characterized in that it comprises a detection sensor for measuring the thickness of the stave cooler by irradiating ultrasonic or electromagnetic waves to the front side of the stave cooler do.

In the present invention, the detection sensor is made of an ultrasonic probe, the discharge pipe in which the detection sensor is installed is perpendicular to the front surface of the back of the main body of the stave cooler and ultrasonic waves or electromagnetic waves irradiated from the detection sensor of the main body It is provided with an extension pipe to be irradiated to the front surface, and the discharge pipe is installed on the outer circumferential surface of the extension pipe so that the water passing through the water jacket is discharged through the support pipe portion.

The blast furnace stave cooler monitoring system of the present invention for achieving the above object is provided with a stave cooler installed in the blast furnace and having a water jacket portion therein and having a supply pipe and a discharge pipe for supplying and discharging cooling water to the water jacket portion; ,

Blast furnace cooler detection unit is provided on the main body of the stave cooler or installed in the supply pipe or discharge pipe having a detection sensor for detecting the surface thickness of the stave cooler by irradiating ultrasonic or electromagnetic waves to the front side of the stave cooler Field,

A database for collecting and storing the thickness information of the stave cooler and the signal detected from the detection sensors installed in each of the stave cooler, and by analyzing the information stored in the database to detect the defective state of the stave installed in the blast furnace It is characterized by having a microprocessor.

In the present invention, the blast furnace stave cooler detection unit and the blast furnace stave cooler monitoring device using the same can detect the wear state of the stave coolers installed in the blast furnace, and thus the blast furnace maintenance is easy, Pressure leakage through the water jacket of the stave cooler can be detected, further preventing blast furnace safety accidents.

1 is a perspective view showing a blast furnace stave cooler detection unit and a blast furnace stave cooler monitoring device using the same according to the present invention,
2 is a partial ablation perspective view of the stave detection unit,
3 to 6 are graphs showing experimental results of measuring the front thickness of a stave cooler using a blast furnace stave cooler detection unit and a blast furnace stave cooler monitoring device using the same according to the present invention.

The present invention is to measure the thickness of the portion having a surface corresponding to the inside of the blast furnace of the stave cooler installed in the blast furnace, and to prevent the gas inside the blast furnace into the water jacket flowing through the coolant, One embodiment is shown in FIGS. 1 and 3.

Referring to the drawings, the stave cooler monitoring apparatus 10 using the blast furnace stave cooler detection unit according to the present invention is a stave cooler (20) using a change in the wavelength when passing through different media using ultrasonic waves, electromagnetic waves, and the like. The thickness of the front surface side of the stave cooler 20, that is, the front surface thickness of the stave cooler 20 exposed to the inside of the blast furnace, is irradiated with ultrasonic waves or electromagnetic waves on the front side of the stave cooler to detect the thickness of the surface of the stave cooler. Blast furnace cooler detection unit 30 having a detection sensor, a database for collecting and storing the thickness information of the stave cooler, the signal detected from the detection sensors installed in each of the stave cooler, and the database It is provided with a control unit 50 having a detection unit for analyzing the information stored in the detection of the defective state of the stave installed in the blast furnace.

As shown in FIGS. 1 and 2, the blast furnace stave cooler detection unit 30 has a worn state, that is, a stave cooler 20 installed on the inner surface of the blast furnace 100 to protect the shell. In order to detect the wear state of the copper plate portion 25 installed on the front of the) is provided with a detection sensor (31).

The stave cooler 20 is provided between the refractory in the blast furnace 100 and has a main body 22 having a water jacket 21 installed therein, supplying cooling water to the water jacket 21 to the main body 22. And a discharge pipe 24 for discharging the cooling water from the supply pipe 23 and the water jacket 21. The detection sensor 31 is installed at one side of the supply pipe 23 or the discharge pipe 24. The detection sensor 31 may further include an ultrasonic transmitter 31a formed of an ultrasonic sensor (probe or oscillator) and a receiver 31b for receiving a signal reflected back. The transmitting unit 31a for transmitting the ultrasonic wave may include a piezoelectric element, and the receiving unit may include a piezoelectric ceramic or a resonator such as barium titanate.

The detection sensor is not limited thereto, and a sensor in which a wavelength changes while passing through a medium may be used. For example, it may be made of an electromagnetic sensor capable of generating an electromagnetic wave of a predetermined frequency, an optical sensor may be further provided to detect the inflow of gas in the furnace into the interior of the stave.

The detection sensor 31 is installed at the end of the extension pipe 32 on the rear surface of the main body 22 of the stave cooler, that is, the rear surface of the main body 22 corresponding to the front surface of the blast furnace 100 and the side corresponding to the inside. . The detection sensor 31, ie, the probe, installed on the extension pipe 32 is installed on the support flange 33, and the support flange 33 is coupled to the fixing flange 34 at the end of the extension pipe 32 so that It is installed to correspond to the inner surface of the stave cooler 20. A sealing member 35 is installed between the fixed flange 34 and the support flange 33 to prevent leakage of cooling water. The sealing member may be made of a urethane pack, but is not limited thereto. And the detection sensor 31 may be further provided with a protective cover for protecting the detection sensor 31 to withstand high heat and the like. The extension pipe 32 is preferably installed to be perpendicular to the inner rear surface of the stave cooler, that is, the rear surface of the front portion corresponding to the surface corresponding to the inside of the blast furnace. The detection sensor 31 may be further provided with a power supply unit for supplying power.

Meanwhile, the detection sensor may be installed in the main body 22 of the stave cooler 20. In this case, the ultrasonic waves irradiated from the ultrasonic probe which is the detection sensor are irradiated to the rear surface through the cooling water injected into the water jacket of the stave cooler, that is, the cooling water between the ultrasonic probe and the rear surface. In this case, a separate cooling unit may be further provided to protect the detection sensor by heat generated from the main body 22.

The stave cooler detection unit 20 configured as described above generates ultrasonic waves from the detection sensor 31 installed in the extension pipe of the stave cooler 30 mounted on the blast furnace, passes the cooling water, and then moves the back of the stave cooler 20. Will pass. At this time, when passing through the water in the connecting pipe 32 and then passing through the back of the stave cooler 20, the reflected wavelength is changed due to the change of the medium, and between the rear side and the front of the stave cooler 20. It is changed after passing through copper, the medium corresponding to the thickness of the front part of the stave.

That is, after passing through the cooling water in the connecting pipe 32, as shown in Figures 3 to 6 after passing through the boundary between the coolant cooling water and the stave cooler 20 and the stave cooler 20 and then refractory and or furnace The internal boundary wavelength is changed. Therefore, by measuring the distance between them, it is possible to measure the distance between the detection sensor 31 and the back of the stave cooler 20 and the thickness of the stave. According to the inventors' experiment, the distance between the inner surface of the probe and the stave cooler is measured to be 653 mm, and if the thickness of the stave cooler is located at the front, the thickness of the copper plate 25 made of copper is 21.1 mm and the error is 1/100 mm. The range was confirmed.

Measurements as described above are measured in a non-contact underwater ultrasonic method without the use of a separate contact medium. Ultrasonic waves are sent to the stave 20 by the transmitting unit 31a of the detection sensor 31 installed at the end of the connecting pipe 32, and the receiving unit 31b receives the ultrasonic waves reflected from the medium and its boundary. do. That is, the ultrasonic wave sent from the detection sensor 31 to measure the wear state of the copper plate portion 25 on the surface of the stave 20 exposed inside the blast furnace is a copper plate portion 25 consisting of cooling water, the main body 22, and copper. The ultrasonic wave is irradiated to and received from the ultrasonic wave, and the ultrasonic wave reflected from each medium is changed, and the thickness can be measured using the ultrasonic wave.

On the other hand, if the channel (water jacket or cooling channel) of the cooling water is damaged in the process of measuring the thickness of the stave as described above, the BFG gas inside the blast furnace is included in the cooling water passing through the water jacket, in this case, The noise width is drastically increased. In this way, the damage of the cooling line of the stave 20 can be detected using the principle that the noise increases rapidly. (See FIG. 3).

Thus, the blast furnace stave wear state is displayed on the display using the detection signal detected from each stave cooler detection unit. Therefore, the wear state of the blast furnace stave can be managed in three dimensions.

In addition, the blast furnace stave cooler detection unit according to the present invention and the blast furnace stave cooler monitoring device using the same can measure the thickness of the stave cooler of the blast furnace through the coolant flow path, so that the thickness of the stave cooler even during operation of the blast furnace can do.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

The blast furnace stave cooler detection unit of the present invention and the blast furnace stave cooler monitoring device using the same can be widely applied to various industrial machines as well as blast furnace.

Claims (3)

It is provided with a stave cooler main body having a water jacket portion therein for cooling the blast furnace, a supply pipe coupled to the stave cooler main body to supply cooling water to the water jacket portion, a discharge pipe for discharging the cooling water of the water jacket portion,
It is provided on the back of the stave cooler main body or installed on one side of the supply pipe or discharge pipe characterized in that it comprises a detection sensor for measuring the thickness of the stave cooler by irradiating ultrasonic or electromagnetic waves to the front side of the stave cooler Blast furnace cooler thickness detection unit. The method of claim 1,
The detection sensor is made of an ultrasonic probe, the discharge pipe in which the detection sensor is installed is perpendicular to the front surface of the back of the main body of the stave cooler and the ultrasonic waves or electromagnetic waves irradiated from the detection sensor can be irradiated to the front of the main body. And an extension pipe installed on the outer circumferential surface of the extension pipe so that water passing through the water jacket is discharged through the support pipe portion. Stave coolers installed in the blast furnace and having a water jacket portion therein and having supply and discharge pipes for supplying and discharging cooling water to the water jacket portion,
Blast furnace cooler detection unit is provided on the main body of the stave cooler or installed in the supply pipe or discharge pipe having a detection sensor for detecting the surface thickness of the stave cooler by irradiating ultrasonic or electromagnetic waves to the front side of the stave cooler Field,
A database for collecting and storing the thickness information of the stave cooler and the signal detected from the detection sensors installed in each of the stave cooler, and by analyzing the information stored in the database to detect the defective state of the stave installed in the blast furnace A blast furnace stave cooler monitoring system comprising a control unit.

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