JP2005127741A - Method and apparatus for detecting leakage of gaseous substance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a leakage detecting method and a leakage detecting apparatus capable of speedily and accurately detecting the presence or absence of a gas leakage and the position of the leakage due to the breakage of an outer steel shell of gas transmission piping or an air heating furnace. <P>SOLUTION: (1) The gas leakage detecting method is used for times when the outer steel shell of a gas transmission pipe or the air heating furnace in which an outer circumferential part is covered with a sheathing material is broken. The temperature between the outer surface of the pipe or the outer steel shell and a sheathing material is measured. When either or both of a temperature measurement value and the amount of temperature change lie outside a predetermined range, the gas leakage is determined in the method and the apparatus for detecting the leakage of gaseous matter. (2) By performing the measurement (1) at a plurality of locations between the outer surface of the pipe or the outer steel shell and the sheathing material, the position of the leakage is detected in the method and the apparatus for detecting the position of the leakage. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention can quickly and accurately detect gas leaks due to damage to gas transport piping and blast furnace hot-blast furnace cores, enabling quick repair of transport pipes and early and short-time repair of hot-blast furnace cores. The present invention relates to a detection method and a detection device for the presence or absence of gas leakage and the gas leakage position.

  In fluid transportation piping in various manufacturing plants, a method of detecting abnormalities due to piping breakage by installing flow meters and pressure gauges at many positions and monitoring their measured values is employed. In particular, high-temperature or low-temperature gas transportation pipes are highly likely to be damaged due to corrosion of the pipes, so that it is necessary to detect abnormalities and quickly repair damaged parts. However, high-temperature or low-temperature gas transport pipes often extend over long distances, and it is not easy to quickly determine whether or not a pipe has been damaged and to identify the damaged part.

  The inner wall of a blast furnace hot blast furnace (hereinafter also simply referred to as “hot blast furnace”) that produces a large amount of high-temperature gas and supplies it to the blast furnace is composed of heat-resistant bricks, and the outer side is made of iron outer wall (hereinafter referred to as “iron skin”). "). Hot blast furnaces that supply hot blast to the blast furnace operate continuously for a long period of time. During this operation, if some of the heat-resistant bricks on the inner wall are damaged or fall off due to thermal shock or thermal fatigue, the corresponding area of the Will be exposed to the hot air in the hot stove. In this case, the iron skin of the corresponding part may become red hot, or even damaged and hot air in the furnace is blown out. In the worst case, the iron skin may blow off and cause a catastrophe.

  As a method for detecting an abnormality in a fluid transportation piping system, for example, Patent Document 1 discloses that a fluid transportation piping in which flow rates are respectively measured via flow meters attached to the inflow side and the outflow side of the fluid transportation piping system. When the flow rate ratio Fr satisfies the following formula, that is, Fr> 1 + ε or 1−ε> Fr ≧ 1-λ, a flow meter is obtained. When the flow rate ratio Fr satisfies the following equation, Fr <1-λ, an abnormality detection method is disclosed in which it is determined that there is leakage due to pipe breakage in the fluid transport piping system. Here, ε represents the error ratio, and λ represents the ratio of the leak amount that is not subjected to emergency countermeasures to the inflow side total flow value.

  However, the above-mentioned method has a problem of measurement error due to the flowmeter, and the above-mentioned ε and λ are constants determined empirically. In some cases, it may be erroneously determined that the error has occurred, or conversely, when leakage occurs, the determination cannot be made. Furthermore, it is difficult to identify a damaged part when leakage occurs, and it is necessary to visually check the entire laying range of the piping in order to identify the damaged part.

  As a method for detecting damage to the hot-blast furnace core, it has hitherto been performed to predict an abnormality by attaching a thermometer to the surface of the hot-blast furnace core and monitoring its temperature change. In Patent Document 2, a temperature measuring element that is magnetically adsorbed on the iron skin surface of the furnace body, a transmitter that wirelessly transmits a temperature signal from the temperature measuring element, and a signal from the transmitting apparatus are received, There is disclosed a temperature measuring device for a furnace shell provided with a receiving device that outputs a temperature signal. A temperature sensor, such as a thermocouple, is installed at an appropriate location on the surface of the iron skin so that the temperature rise associated with the occurrence of air leakage can be detected at an early stage. However, when a leak occurs due to damage to the hot air furnace core, the gas in the furnace is immediately released into the atmosphere, so let's detect the air leak when the hot air furnace core is damaged by a thermocouple that can only be measured at a specific `` point ''. If this is the case, thousands of thermocouples must be installed on the surface of the iron shell, making it difficult to put it to practical use in terms of cost and workability.

  In Patent Document 3 and Patent Document 4, an optical fiber is laid in place of the thermocouple on the surface of the hot-blast furnace and blast furnace, and the backward Raman scattered light intensity of the pulsed light incident on the optical fiber and its intensity A hot stove monitoring method is disclosed in which the temperature distribution in the laying area of the optical fiber is measured from the time until return. In this method, the measurement accuracy is slightly improved as compared with the case of using a thermocouple, but in order to detect leakage from a wide range of hot-blast furnace iron shells, a large number of optical fibers must be installed, and the equipment cost, Practical application and maintenance are difficult. Under the circumstances described above, in many cases, the inspector finds damage to the hot-blast furnace iron skin by visual observation or abnormal sound generated by wind leakage.

  Prevention of stress corrosion cracking in the hot stove core leads to an extended life of the hot stove. As an effective means for that purpose, the outer surface of the iron skin is covered with a heat insulating material, and further, the outer surface is covered with an exterior material, so that the iron skin temperature is susceptible to corrosion (200 ± 50) ° C. A method for maintaining the temperature within a temperature range that avoids this is known. FIG. 1 is a diagram showing a general structure in the vicinity of an iron skin of a blast furnace hot stove in which the outer surface of the iron skin is covered with an exterior material. A heat insulating material 2 is attached to the outer surface of the hot stove core 1 in order to maintain the temperature within a certain range. In many cases, the heat insulating material 2 is flexible and low in strength, and easily damaged by wind and rain. Therefore, the heat insulating material is further protected by installing an exterior material 3 on the outside.

  However, when the outer surface of the iron skin is covered with a heat insulating material or an exterior material, visual discovery becomes impossible when the iron skin is red-hot or damaged. As a result, the temperature measured by the thermocouple exceeds the upper limit value of the temperature range in which the occurrence of stress corrosion cracking can be prevented, and an iron skin abnormality of the hot blast furnace is often found. Therefore, the discovery of abnormalities is delayed, it takes a long time to recover the damaged part, and long-term blast furnace breezes are forced.

  Furthermore, in a hot blast furnace in which the outer surface of the iron skin is covered with a heat insulating material or an exterior material, it is difficult to specify the damaged portion when the iron skin is broken. Therefore, after estimating the approximate damaged part, the outer skin around the corresponding part and the heat insulating material are removed to repair or replace the iron skin at the damaged part. Therefore, the amount of exterior materials and heat insulating materials to be removed tends to be large, and the number of man-hours and costs required for repairs increase, and also the effect on blast furnace operation due to prolonged wind breaks, etc. growing.

JP-A-8-303699 (claims and paragraphs [0006] to [0010])

Japanese Utility Model Laid-Open No. 60-29248 (the scope of claims for utility model registration and FIGS. 2 to 5) Japanese Patent Laid-Open No. 5-332850 (Claims and paragraph [0007]) JP-A-6-3197 (claims, paragraphs [0007] and [0008])

  As described above, the following problems remain in the prior art. That is, (1) high-temperature or low-temperature gas transport pipes are often long distances, so it is difficult to find a pipe break and to quickly identify a break point. (2) There is a method of detecting air leakage by installing a temperature sensor such as a thermocouple or optical fiber on the iron skin of a hot air furnace, etc., and monitoring the temperature change. In reality, it is difficult to put it into practical use. (3) In a hot blast furnace where the surface of the iron skin is covered with a heat insulating material or an exterior material, it is impossible to visually detect the damage to the iron skin. Difficult, therefore, the cost required for repair increases and the recovery work takes a long time.

  The present invention has been made in view of the above-mentioned problems, and quickly and accurately detects a gas leak due to damage to a gas transport pipe or a hot-blast furnace iron shell, thereby quickly repairing the transport pipe and a hot-blast furnace iron skin. It is an object of the present invention to provide a detection method and a detection device for the presence / absence of a gas leak and a leak position in order to enable early and accurate repair.

  In order to solve the above-mentioned problems, the present inventor has examined a leakage detection method and a leakage detection device for a gaseous substance from a transportation pipe for a gaseous substance and a hot air furnace, in consideration of the above-described conventional problems. (A) to (c) were obtained and the present invention was completed.

  (A) In a hot blast furnace in which the outside of the pipe is covered with an exterior material, or the outside of the iron skin is covered with an exterior material, and a heat insulation medium is provided between the iron skin and the exterior material, the heat insulation medium and the exterior material Compared to a pipe or hot-blast stove that does not have a temperature measurement value between the outer surface of the pipe or iron skin and the exterior material is less susceptible to atmospheric disturbances. Easy to detect leakage of gaseous substances from the skin.

  (B) The determination of the leakage of the gaseous substance in (a) is made by determining that the leakage has occurred when one or both of the temperature measurement value and the change amount of the temperature measurement value are out of the predetermined range. ,It can be carried out.

(C) The determination of the leakage position of the gaseous substance is performed at a plurality of locations in the longitudinal direction and the circumferential direction of the tube, or in a plurality of locations in the height direction and the circumferential direction of the hot-blast furnace iron skin. This can be done by measuring the temperature with the exterior material and determining that leakage has occurred at a position within the range surrounded by the temperature measurement location outside the range defined in (b).
The present invention has been completed on the basis of the above knowledge, and the gist of the present invention is the method for detecting leakage of gaseous substances shown in the following (1), (2), (4) and (5), and (3 ) And (6) in the gas substance leakage detection device.

  (1) A method for detecting leakage of a gaseous substance when a pipe breaks in which the exterior of the pipe is covered with an exterior material, and the gaseous substance flows inside the pipe, the outer surface of the pipe or between the outer surface and the exterior material A method for detecting leakage of a gaseous substance that measures a temperature in between and determines that the gaseous substance has leaked from a pipe when one or both of the measured temperature value and the temperature change amount are out of a predetermined range.

  (2) A method for detecting a leakage position of a gaseous substance when the pipe is broken, in which the outside of the pipe is covered with an exterior material, and the gaseous substance flows inside the pipe, the outer surface of the pipe or the outer surface and the exterior material When one or both of the temperature measurement value and the temperature change amount deviate from a predetermined range, the leakage position of the gaseous substance from the pipe based on the measurement value A method for detecting the leakage position of a gaseous substance that determines

  (3) A device for detecting a leakage position of a gaseous substance from a pipe in which the exterior of the pipe is covered with an exterior material, and the gaseous substance flows inside the tube, and the outer surface of the pipe or the outer surface and the exterior material Based on the temperature measurement devices installed at a plurality of locations, and the temperature measurement value at each temperature measurement location, when one or both of the temperature measurement value or the temperature change amount is out of a predetermined range, A gas substance leakage position detection device comprising: a determination mechanism that determines that gas substance has leaked at a position within a range surrounded by a temperature measurement location outside the predetermined range.

  (4) A method for detecting an air leak in a hot blast furnace for a blast furnace, in which the outside of the iron skin is covered with an exterior material and a heat retaining medium is provided between the outer surface of the iron skin and the exterior material, the outer surface of the iron skin or the iron A blast furnace that measures the temperature between the outer skin surface and the exterior material, and determines that air leakage has occurred from the hot air furnace when one or both of the temperature measurement value and the temperature change amount are out of a predetermined range. Detection method for hot air furnaces.

  (5) A method for detecting an air leakage position of a hot blast furnace for a blast furnace, wherein the outer surface of the iron skin is coated with an exterior material and has a heat retaining medium between the outer surface of the iron skin and the exterior material, the outer surface of the iron skin Alternatively, the temperature is measured at a plurality of locations between the outer surface of the skin and the exterior material, and when one or both of the temperature measurement value and the temperature change amount are out of a predetermined range, A method for detecting a leak position of a hot blast furnace for a blast furnace that determines a leak position from the hot stove.

  (6) A device for detecting a leakage position of a hot blast furnace for a blast furnace, in which the exterior of the iron skin is covered with an exterior material and has a heat retaining medium between the outer surface of the iron skin and the exterior material, the outer surface of the iron skin Alternatively, one or both of the temperature measurement value and the temperature change amount is determined in advance based on the temperature measurement devices installed at a plurality of locations between the outer surface and the exterior material and the temperature measurement values at each temperature measurement location. An air leakage position detecting device for a hot blast furnace for a blast furnace, comprising: a determination mechanism that determines that air leakage has occurred at a position within a range surrounded by temperature measurement points outside the predetermined range when the range is out of range.

  In the present invention, the “exterior material” means a material for protecting the heat retaining medium from the outside environment such as the atmosphere.

  Further, the “heat retaining medium” is a medium that exists adjacent to the periphery of the iron skin and has a heat insulating action between the inside and the outside, and may be any gas such as air, liquid, and solid. Good.

  “Temperature change” refers to differences in temperature measurements measured at time intervals at different times, differences between time average values within a fixed time, or the amount of change per unit time (time derivative) Any of these may be used.

  According to the method for detecting leakage of a gaseous substance of the present invention, by measuring the temperature between the outer casing and a gas transport pipe or hot-blast furnace core covered with an exterior material, the transport pipe or hot-blast furnace core is measured. As a result, it is possible to quickly and accurately detect the leakage of the gaseous substance due to the breakage of the pipe, so that the transportation pipe can be quickly repaired and the hot-blast furnace iron skin can be repaired early and in a short time. Moreover, the leak position of a gaseous substance can be pinpointed accurately by performing the said temperature measurement in several places between piping or an iron shell, and an exterior material. The gaseous substance leakage position detection apparatus of the present invention is suitable as an apparatus for carrying out the method of the present invention.

  As described above, the present invention measures the temperature between the transport pipe or hot-blast furnace iron skin covered with the exterior material and the exterior material, so that the presence or absence of leakage of gaseous substances due to damage to the pipe or the iron skin and This is a method and apparatus for detecting a leaked part early and accurately. Hereinafter, the present invention will be described in more detail with reference to the drawings.

  FIG. 2 is a diagram showing the concept of the present invention for detecting leakage of a gaseous substance from a pipe whose outer surface of a pipe constituting a transportation pipe system is covered with an exterior material. A high-temperature or low-temperature gaseous substance 6 flows inside the tube 1, and the outer periphery of the tube 1 is covered with an exterior material 3. Temperature measuring devices (thermometers) 4 such as thermocouples are installed at a plurality of locations between the outer surface of the tube 1 and the exterior material 3. The temperature data measured by the temperature measuring device 4 is sent to the temperature monitoring device 5 for temperature display and temperature monitoring. The temperature monitoring device 5 compares the temperature measurement value with a predetermined allowable temperature range, calculates the temperature change amount, and compares the calculated temperature change amount with the predetermined allowable temperature change range. If these values are out of the permissible range, a gas substance leak alarm and leak position are output.

  When the pipe 1 constituting the piping system is damaged due to aging or an unexpected accident, the gaseous substance 6 flowing inside the pipe 1 leaks from the inside of the pipe 1 to the outside of the pipe 1. If detection of this leakage occurrence is delayed, there is a risk of causing a major accident. In FIG. 2, when the tube 1 is broken, the gaseous substance 6 leaks from the inside of the tube 1 to the outside of the tube 1 and flows between the tube 1 and the exterior material 3. In the present invention, the temperature change in the region between the tube 1 and the exterior material 3 caused by the flow of the gaseous substance 6 between the tube 1 and the exterior material 3 is not affected by disturbance due to the atmosphere or the like. It can be detected by the measuring device 4, and the occurrence of leakage can be detected quickly.

  FIG. 3 is a diagram showing a temporal transition of the temperature between the pipe and the exterior material when the pipe constituting the piping system is broken. In addition, the result of the figure is a case where the gaseous substance 6 which flows through the inside of the pipe 1 is a hot air gas, and the temperature of the gaseous substance 6 is higher than the atmospheric temperature. When the tube 1 is damaged, the hot air gas that is the gaseous substance 6 leaks and moves between the tube 1 and the exterior material 3 in FIG. A temperature measuring device 4 installed between the tube 1 and the exterior material 3 detects a temperature change caused by the movement of the hot air gas. When the temperature measurement value exceeds a preset upper limit value (230 ° C. in the example of FIG. 3), the temperature monitoring device 5 outputs an alarm notifying that an abnormality has occurred in the pipe. When the temperature of the gaseous substance 6 flowing in the pipe 1 is lower than the atmospheric temperature, the lower limit value of the temperature is set in advance, so that the gaseous substance when the pipe 1 is broken by the same method as described above. Leak detection is possible.

FIG. 4 is a diagram showing a temporal transition of the temperature change amount between the pipe and the exterior material when the pipe is broken. In the figure, the temperature change amount △ T, the difference between the temperature T _n-1 at the temperature T _n and time t _n-1 at time t _n, which is calculated by the temperature monitoring device _{5, | T n -T n-} 1 |, And the time interval t _n -t _n-1 was 1 minute. When the temperature change amount exceeds a preset upper limit value of the temperature change amount (6 ° C. in the example of FIG. 4), the temperature monitoring device 5 outputs an alarm notifying that an abnormality has occurred in the pipe.

As the temperature change amount, in addition to the above, the difference in the average temperature averaged over time, or the temperature change rate (T _n −T _n−1 ) / (t _n −t _n−1 ) is used. Also good.

  FIG. 5 is a diagram showing a method for specifying a breakage position when the tube is broken, in which FIG. 5 (a) shows a top view of the tube showing the temperature measurement position, and FIG. 5 (b) shows the temperature measurement position. It is a figure showing the time transition of the temperature measurement value in the side view and each measurement position of a pipe | tube.

  As shown in FIG. 3 or FIG. 4, when a leak of a gaseous substance due to breakage of the tube 1 is detected, it is necessary to immediately repair, but for that purpose, it is necessary to specify the breakage position. In FIG. 5, reference numerals 4-1 to 4-5 are installation positions of a temperature measuring device that measures the temperature between the tube 1 and the exterior material 3. Among them, the temperature measuring device 4-2 shows the highest temperature rise, and the temperature rise also occurs in the same 4-1 and 4-4. On the other hand, no temperature change is observed in the temperature measuring devices 4-3 and 4-5.

  From the temperature transition shown by the temperature measuring devices 4-1 to 4-5 as described above, the position where the tube 1 is broken and the gaseous substance leaks is the temperature measuring device 4 in the top view of FIG. -1 and 4-2, and within a range surrounded by three points of the temperature measuring devices 4-1, 4-2, and 4-4 in the side view of FIG. Can be identified. In FIG. 5, the breakage position is identified using the temporal transition of the temperature at each measurement position. However, the breakage position may be identified based on the transition of the temperature change amount ΔT at each measurement position. .

In order to confirm the leak detection method and the leak detection method of the gaseous substance of the present invention and the effects thereof, the following test examples of the present invention and comparative examples were conducted and the results were evaluated.
FIG. 6 is a diagram showing the structure in the vicinity of the iron shell of the blast furnace hot blast furnace targeted by the present invention, in which measures for preventing stress corrosion cracking have been taken. A heat insulating material 2 is attached to the outer surface of the hot-blast furnace iron skin 1 in order to keep the iron skin temperature constant. This heat insulating material is a heat insulating material that is flexible and low in strength, and is easily affected by the heat insulating effect due to disturbance such as wind and rain, and may be damaged. Therefore, the heat insulating material is protected by covering the outside with the exterior material 3. Yes. A temperature measuring device (thermocouple) 4 is installed on the surface of the iron skin, and the measured value of the iron skin temperature is sent to a temperature monitoring device (not shown).

  In the hot air furnace shown in the figure, when damage such as a crack occurs in the iron shell 1, the hot air gas flowing in the hot air furnace leaks from the iron skin 1 to the outside of the furnace and becomes a wind leak. And the exterior material 3. Therefore, the temperature change between the iron skin 1 and the exterior material 3 caused by the occurrence of air leakage is accurately affected by the temperature measuring device 4 installed on the iron skin surface without being affected by the disturbance due to the atmosphere or the like. It is possible to detect well.

FIG. 7 is a diagram showing the temporal transition of the temperature between the iron shell and the exterior material when the hot-blast furnace iron skin is damaged, and FIG. 8 is the iron skin when the hot-blast furnace iron skin is damaged. It is a figure which shows the time transition of the temperature variation | change_quantity between a wall and an exterior material.

  In FIG. 7, since air leakage has occurred due to damage to the iron skin 1, the temperature measurement value between the iron skin 1 and the exterior material 3 rises, and after about 1 hour, a preset temperature upper limit value (same figure) In this case, the temperature monitoring device output an alarm indicating that an abnormality has occurred.

Figure 8 is a temperature change amount △ T, the difference between the temperature T _n-1 at the temperature T _n and time t _n-1 at time t _n, ie | T _n -T _n-1 | a reference, the time interval t _This is the result when _n −t _n−1 is 1 minute. Since air leakage occurred due to damage to the iron skin 1, the value of the temperature change ΔT immediately exceeds the preset upper limit value of the temperature change (10 ° C. in the figure), and the temperature monitoring device gives an alarm for abnormal occurrence. Output.

  As in the above test example, in order to shorten the response time of the temperature monitoring device, a temperature difference at a certain time interval, a temperature change rate (time differential amount), etc. may be adopted as the temperature change amount. On the other hand, there is a risk of hunting or malfunction due to noise, so it is necessary to tune to obtain an appropriate sensitivity. In addition, when leakage gradually proceeds, it is necessary to make a determination based on a long-term tendency, and it is preferable to make a reliable determination based on the transition of the time average value of temperature.

  FIG. 9 is a diagram showing the installation position of the temperature measuring device for specifying the damaged position of the hot stove core. Moreover, FIG. 10 is a figure which shows the test result which pinpoints a failure position when a hot-blast furnace iron skin is damaged, The figure (a), (b) and (c) is the code | symbol ( It is a figure showing the measurement result in the position shown by a), (b) and (c).

  As shown in FIG. 9, a thermocouple was installed as a temperature measuring device 14 at a position indicated by a black circle on the outer surface of the iron shell of the hot stove 11. In this test, the transition of the temperature measurement values at the height positions indicated by (a), (b) and (c) in the figure was monitored closely.

  According to the test results shown in FIG. 10, a large temperature change appears at the position of the 0 degree azimuth at the height position (a) and the position of the 0 degree azimuth at the height (b). At other measurement positions including the position, there was almost no temperature change. Therefore, based on these results, the iron-skin breakage position was estimated between the position of the 0-degree azimuth position of the height position (a) and the position of the 0-degree azimuth position of the height position (b). Further, when the temperature transition of the 0 degree azimuth position of (a) is compared with the temperature transition of the 0 degree azimuth position of (b), the temperature of the 0 degree azimuth position of (b) is higher, and the temperature change Is also big.

  Therefore, as a result of removing the exterior material from the position of the 0 degree azimuth in (b) toward the position of the 0 degree azimuth in (a) 4 m above when repairing the iron skin, Damage to the iron skin was found at a position 1 meter above the position of.

  As a result of totaling the effect of shortening the iron skin repair time by implementing the present invention throughout the year, the repair time which was about 48 hours / year before the implementation of the present invention has been reduced to 12 hours / year by implementing the present invention. It was done.

  According to the method for detecting leakage of a gaseous substance of the present invention, by measuring the temperature between the outer casing and a gas transport pipe or hot-blast furnace core covered with an exterior material, the transport pipe or hot-blast furnace core is measured. As a result, it is possible to detect the leakage of the gaseous material due to the breakage of the pipe early and accurately, so that the transportation pipe can be quickly repaired and the hot-blast furnace iron skin can be repaired early and in a short time. Moreover, the leak position of a gaseous substance can be pinpointed accurately by performing the said temperature measurement in several places between piping or an iron shell, and an exterior material. The apparatus for detecting a leakage position of a gaseous substance of the present invention is suitable as an apparatus for carrying out the method of the present invention. Therefore, the leak detection method and leak device of the present invention can be widely applied in the fields of early detection of damage and safety management of fluid transport piping, chemical reaction containers and the like.

It is a figure which shows the general structure of the vicinity of the iron skin of the blast furnace hot-blast furnace which coat | covered the outer surface of the iron skin with the exterior material. It is a figure which shows the concept of this invention which detects the leakage of the gaseous substance from piping which coat | covered the outer surface of the pipe | tube with the exterior material. It is a figure which shows the time transition of the temperature between a pipe | tube and an exterior material when a pipe | tube is damaged. It is a figure which shows the time transition of the amount of temperature changes between a pipe | tube and an exterior material when a pipe | tube is damaged. It is a figure which shows the identification method of the broken position when a pipe | tube is damaged, The figure (a) represents the upper side figure of the pipe | tube which shows a temperature measurement position, The figure (b) is the side view of the pipe | tube which shows a temperature measurement position It is a figure showing the time transition of the temperature measurement value in each measurement position. It is a figure which shows the structure of the iron skin vicinity of the hot blast furnace for blast furnaces which this invention which took the measure against stress corrosion cracking is intended. It is a figure which shows the time transition of the temperature between an iron skin and an exterior material when a hot-blast furnace iron skin is damaged. It is a figure which shows the time transition of the amount of temperature changes between an iron shell and an exterior material when a hot-blast furnace iron shell is damaged. It is a figure which shows the installation position of the temperature measuring apparatus for pinpointing the damage position of a hot-blast furnace iron skin. It is a figure which shows the test result which pinpoints a failure position when a hot-blast furnace iron skin is damaged, The figure (a), (b) and (c) is the code | symbol (a), (b) in FIG. 9, respectively. It is a figure showing the measurement result in the position shown by (c).

Explanation of symbols

1: tube,
2: Thermal insulation material, thermal insulation medium,
3: Exterior material,
4: Temperature measuring device (thermometer)
5: Temperature monitoring device,
6: gaseous substance,
11: Hot stove
12: Insulation material
14: Temperature measuring device (thermometer)

Claims (6)

  A method for detecting a leakage of a gaseous substance when the pipe is broken, in which the exterior of the pipe is covered with an exterior material and the gaseous substance flows inside the tube, and the temperature between the outer surface of the pipe or the outer surface and the exterior material , And when one or both of the temperature measurement value and the temperature change amount are out of a predetermined range, it is determined that the gas substance has leaked from the pipe.   A method for detecting a leakage position of a gaseous substance when the pipe is broken, in which the exterior of the pipe is covered with an exterior material, and the gaseous substance flows inside the pipe, and between the outer surface of the pipe or between the outer surface and the exterior material The temperature is measured at a plurality of locations, and when one or both of the temperature measurement value and the temperature change amount are out of a predetermined range, the leakage position of the gaseous substance from the pipe is determined based on the measurement value. A method for detecting a leakage position of a gaseous substance.   An apparatus for detecting a leakage position of a gaseous substance from a pipe in which the exterior of the pipe is covered with an exterior material, and the gaseous substance flows inside the tube, and a plurality of parts between the outer surface of the pipe or between the outer surface and the exterior material Based on the temperature measurement device installed at the location and the temperature measurement value at each temperature measurement location, when one or both of the temperature measurement value and the temperature change amount are out of the predetermined range, A gas substance leakage position detection apparatus comprising: a determination mechanism that determines that gas substance has leaked at a position within a range surrounded by a temperature measurement location outside the specified range.   A method for detecting a leak in a hot blast furnace for a blast furnace, wherein the outer surface of the iron skin is covered with an exterior material and has a heat retaining medium between the outer surface of the iron skin and the exterior material, the outer surface of the iron skin or the outer surface of the iron skin Measuring the temperature between the outer wall and the exterior material, and determining that one or both of the temperature measurement value and the temperature change amount are out of a predetermined range, it has been determined that leakage has occurred from the hot air furnace. A method for detecting leakage in a hot blast furnace.   A method for detecting an air leakage position of a hot blast furnace for a blast furnace, in which the exterior of the iron skin is covered with an exterior material and a heat retaining medium is provided between the outer surface of the iron skin and the exterior material, the outer surface of the iron skin or the iron skin The temperature is measured at a plurality of locations between the outer surface and the exterior material, and when one or both of the temperature measurement value and the temperature change amount are out of a predetermined range, the temperature is measured based on the measurement value. A method for detecting a leakage position of a hot blast furnace for a blast furnace, characterized by determining a leakage position of the blast furnace. An apparatus for detecting a leakage position of a hot blast furnace for a blast furnace having a heat retaining medium between the outer surface of the iron skin and the outer covering material, the outer surface of the iron skin being covered with the outer covering material, the outer surface or the outer surface of the iron skin Based on the temperature measurement devices installed at a plurality of locations between the outer packaging and the temperature measurement value at each temperature measurement location, one or both of the temperature measurement value and the temperature change amount deviate from a predetermined range. And a determination mechanism for determining that air leakage has occurred at a position within the range surrounded by the temperature measurement points outside the predetermined range, the air leakage position detecting device for a hot blast furnace for a blast furnace, .

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