KR102421526B1 - Hood exterior structure and detection device to prevent rupture of reactor hood and detect water leakage - Google Patents

Abstract

The present invention relates to a water leak and rupture detection device provided in a hood pipe of an electric furnace, and more particularly, to detect leaks and rupture of a water pipe used to cool the hood pipe so that the hood pipe can be cooled smoothly. It relates to a water pipe leak and rupture detection device in an electric furnace hood that can prevent damage to electric furnace equipment and fire by doing so.
The present invention as a technical means for solving the above problems, a hood provided in a reactor, a plurality of cooling tubes provided along the circumferential direction of the hood, and an optical fiber temperature sensor for measuring the ambient temperature of the cooling tube. The optical fiber temperature sensor may include an optical fiber installed around the cooling tube, and a controller for measuring a temperature distribution on the optical fiber.

Description

Hood exterior structure and detection device to prevent rupture of reactor hood and detect water leakage

The present invention relates to a hood exterior structure and a detection device for preventing rupture of a reactor hood and detecting water pipe leakage, and more particularly, to a hood pipe to prevent explosion due to gas introduced into a combustion air supply pipe of a reactor. Prevention of rupture of the reactor hood and leakage detection of the reactor hood, which can prevent damage to the reactor hood or duct facilities and fire, by detecting the leak in the water pipe used to cool the hood pipe in advance so that the cooling of the hood pipe is performed smoothly It relates to the hood exterior structure and detection device for

The reactor is equipped with a hood to discharge high heat, gas, and impurities generated inside the furnace. For example, in the process of melting or refining molten iron in an electric furnace, a lot of heat, gas, and impurities are emitted, and these emitted substances contain a large amount of substances that are very harmful to the environment, such as carbon monoxide, which can cause serious environmental pollution. In addition, if the device for discharging these substances is overheated or cracked, serious equipment damage may occur, and in some cases, there is a risk of fire and environmental pollution. Therefore, such heat, gas and impurities must be smoothly discharged and managed through the hood pipe to prevent damage to equipment, prevent production stoppage, reduce maintenance costs, prevent safety accidents, and effectively remove environmentally harmful substances from dust collection facilities. However, since the temperature of the gas and exhaust material in the hood pipe is extremely high over 1000° C., it is difficult to achieve the original purpose by simply installing the hood, and a system or structure for cooling the hood is required.

In general, as a configuration for cooling the hood, putty is applied around the hood or a water pipe (hereinafter referred to as a 'cooling pipe') is provided to cool the heat of the hood while passing the cooling water through the cooling pipe was used. . However, since the average surface temperature of the hood is higher than the boiling point of the cooling water, a part of the cooling water is vaporized and the inside of the cooling pipe is in a state of high temperature and high pressure, and the cooling pipe exposed to the high temperature heat and cooling water is easily corroded or weakened. As such, because the cooling tube is used under severe conditions, accidents that occur frequently over time are damaged.

If the cooling tube is damaged, a significant production loss occurs because the electric furnace must be stopped to repair the cooling tube. If the cooling tube is not repaired in a timely manner, serious damage to the electric furnace itself or a fire may occur can cause Since it takes a considerable amount of time to restart an electric furnace once it is stopped, all of the above problems lower production efficiency and increase production cost. Therefore, it is very important to find out whether the cooling tube of the hood is damaged at an early stage and repair it promptly.

Conventionally, in order to check whether the cooling tube of the hood is damaged, a method in which an operator measures the temperature of the surface of the hood one by one using a portable thermal imaging camera or the like has been used. That is, by measuring the surface temperature of the hood, if the temperature is abnormally high, it is determined that there is damage and maintenance is performed. However, this method is difficult to measure accurately and requires a lot of time and manpower.

In order to monitor the hood with a thermal imaging camera, it takes a lot of time and manpower because the measurer has to go around the hood and measure the temperature in various ways, and the part that the measurer has notched or neglected is often not measured. Accuracy will also decrease.

US 10-1122506 B1 US 10-1365525 B1

The present invention is to solve the above problems, by installing an optical fiber temperature sensor capable of continuously measuring the temperature of the hood in real time around the cooling tube provided in the hood to detect the temperature change of the hood and the cooling tube. The purpose of this is to provide a hood external structure and a detection device for preventing rupture of the reactor hood and detecting leaks in the water pipe, which can accurately determine whether the hood is abnormal without the need for the measurer to walk around the hood individually by measuring accurately in real time. have.

The present invention as a technical means for solving the above problems, a hood provided in a reactor, a plurality of cooling tubes provided along the circumferential direction of the hood, and an optical fiber temperature sensor for measuring the ambient temperature of the cooling tube. The optical fiber temperature sensor may include an optical fiber installed around the cooling tube, and a controller for measuring a temperature distribution on the optical fiber.

In a preferred embodiment of the present invention, the optical fiber is spaced apart from the cooling tube and rotates along the circumferential direction of the hood tube, characterized in that it is installed in the longitudinal direction of the hood.

In a preferred embodiment of the present invention, the optical fiber is installed between the plurality of cooling tubes while reciprocating along the longitudinal direction of the hood in parallel with the cooling tube.

In a preferred embodiment of the present invention, the optical fiber is installed to be spaced apart from the hood and the cooling tube.

In a preferred embodiment of the present invention, a fixture is provided in a section where the optical fiber diffracts on both sides of the optical fiber, and the fixture fixes the optical fiber to be spaced apart from the cooling tube.

In a preferred embodiment of the present invention, the fixture comprises a fixing bolt having one side fixed to the hood tube and a fixing ring on the other side, and a support wire for connecting and supporting the fixing ring and the optical fiber. .

In a preferred embodiment of the present invention, a protective layer is formed on the outer side of the optical fiber.

According to the hood external structure and detection device for preventing rupture of the reactor hood and detecting water pipe leakage according to the present invention, the temperature around the hood and the cooling pipe installed in the hood is monitored in real time to detect whether the cooling pipe is damaged in real time. It has the advantage of being able to check and respond. In addition, since there is no need for the person to directly visit the electric furnace for inspection, it is possible to monitor a large number of hoods distributed in a wide range in real time with a small number of personnel, thereby reducing management costs and detecting the presence or absence of damage to the cooling pipe at an early stage. This has the advantage of preventing production disruption and improving efficiency.

1 is a view showing a schematic configuration of an electric furnace to which a leak and rupture detection device of a hood cooling pipe according to the present invention is applied.
2 is a view showing a schematic configuration of a cooling pipe leakage and rupture detection device in the hood of an electric furnace according to the present invention.
3 is a view showing a state in which the optical fiber of the cooling pipe leakage and rupture detection device in the electric furnace hood according to the present invention is installed around the cooling pipe of the hood;

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a schematic configuration of an electric furnace to which a leak and rupture detection device for a hood cooling pipe according to the present invention is applied, and FIG. 2 is a schematic view of a cooling pipe leak and rupture detection device in the hood of an electric furnace according to the present invention It is a view showing the configuration, and FIG. 3 is a view showing a state in which the optical fiber of the cooling pipe leak and rupture detection device in the rear pipe of the electric furnace according to the present invention is installed around the cooling pipe of the hood.

In the drawings, the hood of an electric furnace to which the present invention is applied is shown as an example, but the hood external structure and detection device for preventing rupture of the reactor hood and detecting water pipe leakage according to the present invention, as will be described later, are It can be applied to various types of exhaust pipes passing through, hoods, and hot stoves. For example, it can be applied to various reactors in steel mills or steel mills, as well as reactors in chemical plants and cement makers. Hereinafter, the electric furnace hood shown in the drawings will be described as an example.

1 to 3, the hood cooling pipe leak and rupture detection device of the electric furnace according to the present invention is provided along the circumferential direction of the hood (30) provided in the electric furnace (10), the hood (30) It is composed of a plurality of cooling tubes (100) and an optical fiber temperature sensor (110) for measuring the ambient temperature of the cooling tube (100).

The electric furnace 10 refers to a furnace that is heated using electric heat, and is a well-known technology used for refining metals in ironworks and the like. The electric furnace 10 is provided with a hood 30 for discharging heat and gas generated from the inside to the outside. Since the hood 30 passes through the high heat and gas generated in the electric furnace 10, the surface temperature may rise from 200°C to a maximum of 1000°C. Therefore, if it is left as it is, the hood 30 and the cooling pipe installed in the hood may be overheated and damaged, or a fire may occur in the vicinity in severe cases. When the hood 30 is damaged, the electric furnace 10 must be stopped and repaired, and the more severe the damage, the more time is required for the maintenance or repair, resulting in a production setback. Therefore, the heat of the hood 30 must be stably cooled.

To this end, the hood 30 is provided with a plurality of cooling tubes 100 along the longitudinal direction. The cooling tubes 100 are arranged side by side at regular intervals on the outer surface of the hood 30 . The shape of the cooling pipe 100 may be configured in various known shapes, but a plurality of generally cylindrical pipes are arranged side by side on the surface of the hood 30 , and a certain space is provided between the cooling pipes 100 . is formed. Hereinafter, the hood 30 having the above configuration will be described as an example. However, it goes without saying that the shape of the hood 30 and the cooling pipe 100 may be variously formed as needed.

The cooling pipe leakage and rupture detection device of the electric furnace hood according to the present invention includes an optical fiber 130 installed in a heat source, and a control unit 150 for measuring a temperature distribution on the optical fiber 130 . The control unit 150 includes a light source unit (not shown) that injects light into the optical fiber 130, a distribution temperature measuring unit (not shown) that measures a distribution temperature by analyzing the wavelength of light scanned and reflected from the light source unit, and the control unit. When the temperature measured at 150 is greater than or equal to a specific temperature, a display unit 170 and an alarm unit 173 for notifying an operator or a manager thereof may be included. In addition, if necessary, the communication unit 175 may be provided in the control unit 150 so that the operator can check whether the hood 30 is abnormal in the field with a terminal such as a smartphone. Hereinafter, the optical fiber temperature sensor 110 refers to a concept including an optical fiber 130 and a light source unit necessary for measuring a temperature using the optical fiber 130 , and the control unit 150 is defined as a separate configuration.

The optical fiber temperature sensor 110 is continuously installed from several kilometers to several tens of kilometers with one optical fiber 130 to continuously measure the temperature of a wide space as well as measure the distribution temperature for each location. In case the temperature of the location changes abnormally, the location and temperature can be precisely specified.

The optical fiber 130 of the hood external structure and the sensing device for preventing the rupture of the reactor hood and detecting water pipe leakage according to the present invention is provided at a location spaced apart from the plurality of cooling pipes 100 described above by a predetermined distance. In this case, the distance between the optical fiber 130 and the cooling tube 100 is preferably configured to be uniform. Therefore, when the cooling tube 100 is normally operated and the temperature of the cooling tube 100 is relatively uniform, the temperature measured by the optical fiber 130 is also uniformly distributed to visually check whether the cooling tube 100 is overheated. Or, make it relatively easy to judge numerically. In addition, if necessary, in the case of a steady state, the data on the distribution temperature for each location of the cooling pipe 100 is measured and stored in advance, and the temperature measured by the optical fiber 130 and the cooling pipe 100 are stored in the normal state. It may be set to determine the presence or absence of abnormality in the cooling tube 100 by relatively comparing the temperature distribution of .

On the other hand, the optical fiber 130 may be installed in the longitudinal direction of the hood 30 while being spaced apart from the cooling pipe 100 and rotating along the circumferential direction of the hood 30 , if necessary. However, in this form, since the optical fiber 130 is installed to cross the cooling pipe 100 , the temperature distribution between the cooling pipe 100 and the part where the cooling pipe 100 is located will change repeatedly. It is difficult or inconvenient to do. Accordingly, in a preferred embodiment of the present invention, the optical fiber 130 is installed between the plurality of cooling tubes 100 along the longitudinal direction of the hood 30 in parallel with the cooling tube 100 , and one end of the hood 30 . Alternatively, at the other end, it is installed to cross the cooling pipe 100 . That is, as shown in FIG. 3 , after the optical fibers 130 started from one side in the longitudinal direction are installed side by side between the cooling tubes 100 along the cooling tube 100 in the other direction, one or a plurality of cooling tubes are cooled at the other end. After crossing the tube 100, it is installed side by side in one direction again. In this way, although the temperature distribution of the portion crossing the cooling tube 100 may be different from the distribution temperature of the portion arranged in parallel with the cooling tube 100 , the optical fiber 130 is spaced apart from the cooling tube 100 as uniformly as possible. can be installed According to this installation method, most of the cooling tube 100 can be monitored even if the portion where the optical fiber 130 crosses the cooling tube 100 is ignored and monitored, and the optical fiber 130 is connected to the cooling tube 100 . Even when monitoring the temperature of the part crossing the In addition, since a certain space is formed between the cooling tubes 100 , it is easy to uniformly install the optical fibers 130 to be spaced apart from the cooling tube 100 by a predetermined interval. In a preferred embodiment of the present invention, one optical fiber 130 is arranged side by side on both sides of two cooling tubes. That is, after the optical fibers 130 installed side by side in the longitudinal direction along the cooling tube 100 in the space between the cooling tubes 100 traverse the two cooling tubes 100 at one end or the other end, the cooling tube 100 again ) to be installed side by side. Thus, one optical fiber 130 has a structure for monitoring two cooling tubes 100 positioned on both sides. In this structure, not only can many cooling tubes 100 be efficiently managed with a small number of optical fibers 130, but also the bending radius at which the optical fibers 130 are bent at both ends is increased, so that the bending portion of the optical fiber 130 is not strained. There are advantages to avoiding it.

Although not shown in the drawings, the optical fiber 130 may be installed in various structures along the longitudinal direction of the cooling tube 100 and the hood 30 . For example, as shown in FIG. 3 , the optical fiber 130 installed while reciprocating along the longitudinal direction of the hood 30 may be installed so as to reciprocate from one end in the longitudinal direction of the hood to the other end. After being divided into sections and installed to reciprocate a specific section, other adjacent sections may be installed to reciprocate continuously or by a separate optical fiber. In addition, if necessary, the installation section of the optical fiber may be configured to partially overlap. As such, the optical fiber 130 may be installed in various structures along the longitudinal direction of the hood 30 .

The optical fiber 130 is installed so as not to come into contact with the surface of the hood 30 and spaced apart from the cooling tube 100 by a predetermined interval to prevent direct transfer of the surface temperature of the hood 30 to the optical fiber 130 . Heater damage can be prevented or minimized. In addition, if necessary, a protective layer (not shown) or a protective coating for protecting the optical fiber 130 from heat may be formed on the outside of the optical fiber 130 . The protective layer may be made of a variety of known materials, such as a metal having heat insulation and heat resistance.

In order to keep the optical fiber 130 spaced apart from the surface of the hood 30 and the cooling tube 100 , a fixture 190 for fixing the optical fiber 130 is required. In addition, it is preferable that the fixture 190 minimizes contact with the optical fiber 130 while supporting the optical fiber 130 . As the contact area between the fixture 190 and the optical fiber 130 increases, the heat from the hood 30 is directly transmitted to the optical fiber 130 to damage the optical fiber 130 or to measure the temperature using the optical fiber 130 . Because errors can occur.

To this end, the cooling pipe leakage and rupture prevention device in the electric furnace hood according to the present invention is provided with a fixture 190 on both sides of the optical fiber 130 in the section where the optical fiber 130 diffracts, so that the fixture 190 is the optical fiber. Both sides of the optical fiber 130 are supported so that the 130 is supported while being floated from the wall surfaces of the cooling tube 100 and the hood 30 . In more detail, a fixture 190 is provided in a section where the optical fiber 130 is diffracted after traversing the cooling tube 100 on one side or the other side of the hood 30 so that the fixture 190 is connected to the optical fiber 130 . ) is supported from both sides so as to be spaced apart from the surface of the hood 30 and the cooling pipe 100 . In a region where the cooling pipe 100 is located, there may be insufficient space to install the fixture 190 , or the fixture 190 may damage the cooling pipe 100 . However, it is relatively easy to secure a space for installing the fixture 190 in the space between the cooling tubes 100 .

As shown in the drawing, the fixture 190 includes a fixing bolt 193 having one side fixed to the surface of the hood 30 and a fixing ring provided on the other side, and a support wire connecting the fixing ring and the optical fiber 130 . (195). Thus, the fixing member 190 is vertically fixed to the surface of the hood 30 so that the fixing ring is spaced apart from the hood 30 tube, and then the optical fiber 130 is tightly fixed using the support wire 195 . When the optical fiber 130 is fixed using the support wire 195 as described above, the amount of heat transferred from the hood 30 to the optical fiber 130 can be minimized, thereby preventing measurement errors or damage to the optical fiber 130 . In addition, since the distance between the cooling tube 100 and the optical fiber 130 is also maintained uniformly, the temperature distribution and change can be accurately and easily measured. At this time, if necessary, a heat insulating cover (not shown), etc. is further provided on the portion of the optical fiber 130 in contact with the support wire 195 to minimize the heat transferred from the support wire 195 to the optical fiber 130 . can

In the above configuration, the cooling pipe leak and rupture detection device in the hood of the electric furnace according to the present invention is located in the vicinity of the cooling pipe 100 as high heat water vapor is emitted from the cooling pipe 100 when the cooling pipe 100 is damaged due to rupture. The temperature of the optical fiber 130 is also changed. As is well known, the optical fiber temperature sensor 110 can measure the temperature change at each position linearly. Therefore, if the cooling tube 100 at a specific location is damaged and the surrounding temperature changes suddenly, the location can be easily found with a small error. When the temperature value at a specific location of the specific optical fiber temperature sensor 110 changes rapidly, the control unit 150 informs the operator or manager through an alarm or display unit, and the operator or manager immediately checks the relevant part and takes necessary measures. can take

4 is a view showing another embodiment in which the optical fiber is installed around the cooling pipe of the hood in the cooling pipe leak and rupture detection device in the electric furnace hood according to the present invention.

Referring to FIG. 4 , the cooling pipe leakage and rupture detection device in the electric furnace hood according to another embodiment of the present invention is provided so that the fixing net 200 is wrapped around the outside of the hood 30 provided with the cooling pipe 100 . The optical fiber 130 is installed inside or outside the fixed network 200 while reciprocating along the longitudinal direction of the hood 30 in parallel with the cooling tube 100 as described above. A variety of materials that can withstand the heat of the hood 30 may be used for the fixing network 200 . A wire mesh may be used as the fixed mesh 200 .

The optical fiber 130 is fixed to the fixing network 200 with a fixing wire 210 that can withstand the heat of the hood 30 . The fixing wire 210 may be made of a variety of known materials. The optical fiber 130 is fixed on the inside and outside of the fixing network 200 , and is preferably installed so as to be spaced apart from the outer wall of the hood 30 and/or the cooling tube 100 .

5 is a view showing another embodiment in which the optical fiber is installed around the cooling pipe of the hood in the cooling pipe leak and rupture detection device in the electric furnace hood according to the present invention.

Referring to FIG. 5 , the cooling pipe leakage and rupture detection device in the electric furnace hood according to another embodiment of the present invention includes a plurality of straps 230 along the circumferential direction of the hood 30 , and an optical fiber 130 . It can be seen that is fixed to the inside or outside of the strap (230).

As shown in the drawings, the strap 230 may have perforations formed at regular intervals so that the fixing wire 210 passes through the perforations to fix the adjacent optical fiber 130 . The strap 230 and the fixing wire 230 may be made of a variety of known materials that can withstand the heat of the hood 30 , and the strap 230 is on both sides of the optical fiber 130 as shown in the drawing. It may be provided, and if necessary, one or more may be additionally provided in the center portion.

Since the installation form and location of the optical fiber 130 are the same as those described in FIG. 3 , a redundant description will be omitted.

As such, although specific embodiments have been described in the detailed description of the present invention, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, and should be defined by the claims and equivalents as well as the claims to be described later.

100: cooling tube
110: optical fiber temperature sensor
130: optical fiber
150: control unit
170: display unit
173: alarm department
175: communication department

Claims (8)

It consists of a hood provided in the reactor, a plurality of cooling tubes provided along the circumferential direction of the hood, and an optical fiber temperature sensor for measuring the ambient temperature of the cooling tube,
The optical fiber temperature sensor is configured to include an optical fiber installed around the cooling tube, and a controller for measuring a temperature distribution on the optical fiber,
The optical fiber is installed between the plurality of cooling pipes while reciprocating along the longitudinal direction of the hood in parallel with the cooling pipe,
The optical fiber is installed to be spaced apart from the hood and the cooling pipe,
A fixture is provided in a section where the optical fiber diffracts to both sides of the optical fiber, and the fixture fixes the optical fiber to be spaced apart from the cooling tube,
Wherein the fixture comprises a fixing bolt having one side fixed to the hood and a fixing ring on the other side, and a support wire for connecting and supporting the fixing ring and the optical fiber. hood monitoring device for leak detection.
delete delete delete delete delete It consists of a hood provided in the reactor, a plurality of cooling tubes provided along the circumferential direction of the hood, and an optical fiber temperature sensor for measuring the ambient temperature of the cooling tube,
The optical fiber temperature sensor is configured to include an optical fiber installed around the cooling tube, and a controller for measuring a temperature distribution on the optical fiber,
The optical fiber is installed between the plurality of cooling pipes while reciprocating along the longitudinal direction of the hood in parallel with the cooling pipe,
A hood monitoring device for preventing rupture of a reactor hood and detecting leakage of a cooling pipe, characterized in that the fixing net is provided on the outside of the hood, and the optical fiber is fixed inside or outside the fixing network with a fixing wire .
It consists of a hood provided in the reactor, a plurality of cooling tubes provided along the circumferential direction of the hood, and an optical fiber temperature sensor for measuring the ambient temperature of the cooling tube,
The optical fiber temperature sensor is configured to include an optical fiber installed around the cooling tube, and a controller for measuring a temperature distribution on the optical fiber,
The optical fiber is installed between the plurality of cooling pipes while reciprocating along the longitudinal direction of the hood in parallel with the cooling pipe,
A plurality of straps are provided on the outer side of the hood along the circumferential direction so that the optical fiber is fixed with a fixing wire so as to be fixed inside or outside the strap. hood monitoring device for

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