CN112213462A - Method for detecting cracking condition of radiant tube of annealing furnace - Google Patents
Method for detecting cracking condition of radiant tube of annealing furnace Download PDFInfo
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- CN112213462A CN112213462A CN202010894027.5A CN202010894027A CN112213462A CN 112213462 A CN112213462 A CN 112213462A CN 202010894027 A CN202010894027 A CN 202010894027A CN 112213462 A CN112213462 A CN 112213462A
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- 238000000137 annealing Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000005336 cracking Methods 0.000 title claims abstract description 36
- 238000010926 purge Methods 0.000 claims abstract description 53
- 239000007789 gas Substances 0.000 claims description 146
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 47
- 239000001301 oxygen Substances 0.000 claims description 47
- 229910052760 oxygen Inorganic materials 0.000 claims description 47
- 239000002699 waste material Substances 0.000 claims description 37
- 238000001514 detection method Methods 0.000 claims description 25
- 230000008859 change Effects 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052704 radon Inorganic materials 0.000 description 1
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical compound [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/204—Structure thereof, e.g. crystal structure
- G01N33/2045—Defects
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- Crystallography & Structural Chemistry (AREA)
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
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Abstract
The invention discloses a method for detecting cracking condition of radiant tubes of an annealing furnace, which is applied to the annealing furnace, wherein a plurality of radiant tubes are arranged in the annealing furnace along the furnace wall, and one end of each radiant tube is provided with an air conveying unit, and the method comprises the following steps: when the radiant tube is in a shutdown state, controlling the air conveying unit to convey a purging gas into the radiant tube for air purging so as to clean reserved gas in the radiant tube, wherein the purging gas is a gas containing a preset content of a specific gas, and the reserved gas is a gas in the radiant tube before the radiant tube is subjected to air purging; after the reserved gas is cleaned, detecting the content value of the specific gas in the radiant tube; when the content value of the specific gas is lower than the preset content, the cracking of the radiant tube is determined, and the technical problem that the cracked radiant tube cannot be accurately positioned when the cracking condition of the radiant tube of the annealing furnace is detected in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for detecting cracking condition of a radiant tube of an annealing furnace.
Background
The radiant tubes are arranged along the furnace wall in the continuous annealing furnace, and heat is radiated in the furnace by burning fuel gas in the radiant tubes, so that the band steel in the same row in the furnace is heated and annealed, and the radiant tubes of the large-scale continuous annealing furnace can reach more than 300 sets. The radiant tube is cracked frequently in actual production due to equipment aging, furnace condition change and other reasons, and the severe cracking of the radiant tube can cause the atmosphere in the furnace to be difficult to control, so that the oxygen content in the furnace is increased, and the surface quality of strip steel is influenced.
In the prior art, the cracking tendency of the radiant tube is mainly judged by detecting the oxygen content in the furnace, and then, when the furnace is cleaned and overhauled, maintenance personnel enter the furnace to check the actual cracking condition of the radiant tube. This approach has the following disadvantages:
1. because the number of the oxygen content detection devices in the furnace is limited (usually, only one to two devices are arranged in each section), the cracking tendency of the radiant tube is judged by adopting the oxygen content, and the actual cracked radiant tube is difficult to accurately position;
2. the oxygen content change detected by different distances between the cracked radiant tube and the detection device is greatly different, so that the detection error is larger;
3. when the change of the oxygen content in the furnace is detected, the quality of the strip steel is generally influenced, and preventive maintenance cannot be carried out.
4. The way in which maintenance personnel enter the furnace to check for actual cracking of the radiant tube firstly puts high demands on the safety protection of the inspection personnel, and secondly, the inspection way usually takes a long time.
Disclosure of Invention
The embodiment of the application provides a method for detecting the cracking condition of the radiant tube of the annealing furnace, and solves the technical problem that the cracked radiant tube cannot be accurately positioned when the cracking condition of the radiant tube of the annealing furnace is detected in the prior art.
The application provides the following technical scheme through an embodiment of the application:
a method for detecting cracking of radiant tubes of an annealing furnace is applied to the annealing furnace, a plurality of radiant tubes are arranged in the annealing furnace along the furnace wall, one end of each radiant tube is provided with an air conveying unit, and for each radiant tube, the method for detecting the cracking of the radiant tubes of the annealing furnace comprises the following steps: step A, when the radiant tube is in a shutdown state, controlling the air conveying unit to convey a purging gas into the radiant tube for air purging so as to clean a reserved gas in the radiant tube, wherein the purging gas is a gas containing a preset content of a specific gas, and the reserved gas is a gas in the radiant tube before the air purging is performed on the radiant tube; b, detecting the content value of the specific gas in the radiant tube after the reserved gas is cleaned; and C, determining that the radiant tube is cracked when the content value of the specific gas is lower than the preset content.
In one embodiment, the purge gas is air having an oxygen content value of 20% to 20.9%, the specific gas is the oxygen gas, and the predetermined content is 20% to 20.9%; when the content value of the specific gas is lower than the preset content, determining that the radiant tube is cracked, wherein the determining comprises the following steps: determining that the radiant tube is cracked when the oxygen content value in the radiant tube is lower than 20%.
In one embodiment, said determining that said radiant tube is cracked when the oxygen content value in said radiant tube is below 20% comprises: determining that the radiant tube is slightly cracked when the oxygen content value is between 15 and 20 percent; determining that the radiant tube is severely cracked when the oxygen content value is between 0 and 15 percent.
In one embodiment, after the detecting the content value of the specific gas in the radiant tube, the method further comprises: determining that the radiant tube is not cracked when the oxygen content value is between 20% and 20.9%.
In one embodiment, the air delivery unit comprises: the burner comprises a burner controller, an air conveying pipeline, an air electromagnetic valve and a fan, wherein the air electromagnetic valve and the fan are arranged on the air conveying pipeline; the control of the air conveying unit to convey the purge gas into the radiant tube for air purging comprises the following steps: and controlling the air electromagnetic valve and the fan to be opened through the burner controller, and conveying the air into the radiant tube for air purging.
In one embodiment, the air purge is between 55 seconds and 60 seconds long.
In one embodiment, the other end of the radiant tube is communicated with a waste header through a waste branch tube, and the purge gas delivered into the radiant tube by the air delivery unit enters the waste header through the waste branch tube; after the reserved gas is cleaned, detecting the content value of the specific gas in the radiant tube, wherein the detecting comprises the following steps: and after the reserved gas is cleaned, detecting the content value of the specific gas in the waste branch pipe.
In one embodiment, a waste detector is arranged on the waste branch pipe; the detecting the content value of the specific gas in the waste branch pipe comprises the following steps: and detecting the content value of the specific gas in the waste branch pipe through the waste detector.
In one embodiment, before determining that the radiant tube is cracked when the content value of the specific gas is lower than the preset content, the method further comprises: repeatedly executing step A, B for multiple times, and taking the average value of the content values of the specific gas obtained by multiple detections as the final content value of the specific gas; when the content value of the specific gas is lower than the preset content, determining that the radiant tube is cracked, wherein the determining comprises the following steps: and when the content value of the final specific gas is lower than the preset content, determining that the radiant tube is cracked.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the application provides a detection method, aiming at each radiant tube in an annealing furnace, when the radiant tube is in a shutdown state, the air blowing is carried out by delivering the blowing gas with the preset content of the specific gas into the radiant tube through the air delivery unit, after the reserved gas in the radiant tube is cleaned, the reserved gas cannot be filled in the radiant tube, the content value of the specific gas in the radiant tube is detected, if the content value is lower than the preset content, the radiant tube is cracked, the furnace gas enters the radiant tube through the crack of the radiant tube, so that the specific gas in the radiant tube is diluted by the furnace gas, the detection method is used for independently detecting each radiant tube in the annealing furnace, so that which radiant tube in the annealing furnace is cracked can be accurately positioned, and the technical problem that the cracked radiant tube cannot be accurately positioned when the cracking condition of the radiant tube of the annealing furnace is detected in the prior art is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a method for detecting a cracking condition of a radiant tube of an annealing furnace according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides a method for detecting the cracking condition of the radiant tube of the annealing furnace, and solves the technical problem that the cracked radiant tube cannot be accurately positioned when the cracking condition of the radiant tube of the annealing furnace is detected in the prior art.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a method for detecting cracking of radiant tubes of an annealing furnace is applied to the annealing furnace, a plurality of radiant tubes are arranged in the annealing furnace along the furnace wall, one end of each radiant tube is provided with an air conveying unit, and for each radiant tube, the method for detecting the cracking of the radiant tubes of the annealing furnace comprises the following steps: step A, when the radiant tube is in a shutdown state, controlling the air conveying unit to convey a purging gas into the radiant tube for air purging so as to clean a reserved gas in the radiant tube, wherein the purging gas is a gas with a preset oxygen content, and the reserved gas is a gas in the radiant tube before the radiant tube is subjected to air purging; b, detecting the oxygen content value in the radiant tube after the reserved gas is cleaned; and C, determining that the radiant tube is cracked when the oxygen content value is lower than the preset oxygen content.
The detection method provided by the application can be used for detecting the annealing furnace temperature, when the annealing furnace is in a shutdown state, the purging gas with the preset oxygen content is conveyed into the radiant tube through the air conveying unit for air purging, after the reserved gas in the radiant tube is cleaned, the reserved gas cannot be filled in the radiant tube, the oxygen content value in the radiant tube is detected, if the oxygen content value is lower than the preset oxygen content, the radiant tube is cracked, the furnace gas enters the radiant tube through the crack of the radiant tube, so that the oxygen content of the sweeping gas in the radiant tube is diluted by the furnace gas, the detection method is used for independently detecting each radiant tube in the annealing furnace, so that which radiant tube in the annealing furnace is cracked can be accurately positioned, and the technical problem that the cracked radiant tube cannot be accurately positioned when the cracking condition of the radiant tube of the annealing furnace is detected in the prior art is solved.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example one
As shown in fig. 1, the present embodiment provides a method for detecting cracking of radiant tubes of an annealing furnace, which is applied to an annealing furnace, wherein a plurality of radiant tubes are arranged along a furnace wall in the annealing furnace, and an air conveying unit is arranged at one end of each radiant tube.
For each radiant tube, the detection method comprises the following steps:
and step A, when the radiant tube is in a shutdown state, controlling an air conveying unit to convey a purging gas into the radiant tube for air purging aiming at the radiant tube in the shutdown state so as to clean a reserved gas in the radiant tube, wherein the purging gas is a gas containing a preset content of a specific gas, and the reserved gas is a gas in the radiant tube before the radiant tube is subjected to air purging.
The state in which the radiant tube is in a shutdown state means a state in which the radiant tube stops radiating heat to the annealing furnace.
The purge gas can be self-prepared according to the requirement, common gas can be selected as the specific gas of the purge gas, and the content of the specific gas is in the preset content during preparation, so that the detection result can be quantitatively obtained in the embodiment.
The purpose of conveying the purging gas in the radiant tube to perform air purging in the embodiment is to clean the reserved gas in the radiant tube, so that when the content value of the specific gas in the subsequent radiant tube is detected, the specific gas remained in the reserved gas influences the detection result, further influences the detection precision and causes misjudgment.
And B, detecting the content value of the specific gas in the radiant tube after the reserved gas is cleaned.
It should be noted that after the reserved gas is cleaned, the reserved gas does not remain in the radiant tube, but is filled with the purge gas.
And C, determining that the radiant tube is cracked when the content value of the specific gas is lower than the preset content.
The detection principle of the embodiment is as follows: after the reserved gas in the radiant tube is cleaned, the reserved gas cannot be filled in the radiant tube, and at this time, the oxygen content value in the radiant tube is detected, ideally (i.e. under the condition that the radiant tube is not cracked), the content value of the specific gas should be at a preset content, and if the radiant tube is cracked, the content value of the specific gas is lower than the preset content, because the furnace gas enters the radiant tube through the crack of the radiant tube, so that the specific gas in the radiant tube is diluted by the furnace gas.
In the present embodiment, the cracking of each radiant tube in the annealing furnace is detected by performing the above-described detection method. The detection method is used for independently detecting each radiant tube in the annealing furnace, so that which radiant tube in the annealing furnace is cracked can be accurately positioned, and the technical problem that the cracked radiant tube cannot be accurately positioned when the cracking condition of the radiant tube of the annealing furnace is detected in the prior art is solved.
In the actual implementation process, preparing all-line radiant tubes and a burner distribution diagram, arriving at a furnace area burner site at the end according to the preset sequence of the burner distribution diagram, and sequentially implementing the detection method for each radiant tube.
In addition, this application detects the radiant tube when the annealing stove is in the shutdown state, according to the testing result, make protection work in advance to after the radiant tube does not have the fracture, control annealing stove operation again, can avoid among the prior art to detect the interior oxygen content of stove at the operation in-process, when detecting the change, generally caused the influence to band steel kind quality, can not accomplish preventive maintenance. Simultaneously, in this application, can directly confirm the position of the radiant tube of fracture, need not the maintenance personal and get into the stove and go to confirm which radiant tube fracture, only need the maintenance personal pertinence to change, can practice thrift a large amount of time.
As an alternative example, the purge gas is air with an oxygen content value of 20% -20.9%, the specific gas is oxygen, and the preset content is 20% -20.9%;
when the content value of the specific gas is lower than the preset content, determining that the radiant tube is cracked, wherein the method comprises the following steps:
when the oxygen content value in the radiant tube is less than 20%, the radiant tube is determined to be cracked.
In the practical implementation process, the heat radiated in the radiant tube is obtained by controlling the burner to ignite the coal gas through the burner controller under the condition of air combustion supporting, so that the air is directly used as the purge gas and the oxygen in the air is used as the specific gas by utilizing the existing arrangement, and the preparation cost of the purge gas can be saved.
As an alternative example, when the oxygen content value in the radiant tube is lower than 20%, the radiant tube is determined to be cracked, and the method comprises the following steps:
when the oxygen content value is 15-20%, determining that the radiant tube is slightly cracked;
when the oxygen content value is between 0% and 15%, the radiant tube is determined to be severely cracked.
This embodiment can also further quantify the fracture degree of radiant tube on can judging the basis of radiant tube fracture to indicate operating personnel to judge whether to need to change or maintain the radiant tube according to actual fracture degree.
As an alternative embodiment, after detecting the content value of the specific gas in the radiant tube, the method further comprises the following steps:
when the oxygen content value is between 20% and 20.9%, the radiant tube is determined to be not cracked.
Those skilled in the art will appreciate that air is mainly composed of nitrogen, oxygen, rare gases (helium, neon, argon, krypton, xenon, radon), carbon dioxide, and other substances (e.g., water vapor, impurities, etc.), wherein the oxygen is about 20% to 20.9%, and thus the predetermined content is selected to be 20% to 20.9%.
As an alternative embodiment, the air delivery unit comprises: the burner comprises a burner controller, an air conveying pipeline, an air electromagnetic valve and a fan, wherein the air electromagnetic valve and the fan are arranged on the air conveying pipeline;
controlling the air conveying unit to convey the purging gas into the radiant tube for air purging, and comprising the following steps:
and controlling the opening of the air electromagnetic valve and the fan through the burner controller, and conveying air into the radiant tube for air purging.
The application utilizes the existing arrangement of radiant tube burning to sweep gas, and can save a large amount of cost.
In the practical implementation process, the burner controller has an automatic control mode and a manual control mode, and under the automatic control mode, the burner controller simultaneously controls coal gas and air to enter the burner for ignition and combustion, and under the manual control mode, the burner controller can independently control air to enter the radiant tube, so that in the embodiment, the burner controller needs to be switched to the manual control mode for working.
As an alternative embodiment, the duration of the air purge is between 55 seconds and 60 seconds.
In order to ensure that the reserved gas in the radiant tube is cleaned up, the influence on the detection result is avoided, the detection precision is further influenced, and the erroneous judgment is caused, the time length for purging the air is set to be 55-60 seconds, so that the cost for purging the gas and conveying the purge gas is wasted due to too long time.
As an alternative embodiment, the other end of the radiant tube is communicated with the waste header pipe through a waste branch pipe, and the purge gas conveyed into the radiant tube by the air conveying unit enters the waste header pipe through the waste branch pipe;
after the reserved gas is cleaned, detecting the content value of the specific gas in the radiant tube, wherein the method comprises the following steps:
and after the reserved gas is cleaned, detecting the content value of the specific gas in the waste branch pipe.
Since the purge gas delivered into the radiant tube finally enters the waste header through the waste branch tube, the content value of the specific gas in the waste branch tube is equal to the content value of the specific gas in the radiant tube by detecting the content value of the specific gas in the waste branch tube. However, the content value of the specific gas in the waste branch pipe is detected, compared with the content value of the specific gas in the radiation pipe, the content value of the specific gas is higher in precision, and the cracking condition of the radiation pipe can be judged more accurately.
In the practical implementation process, for more accuracy, a plurality of detection points can be uniformly distributed in the radiant tube for detection.
As an alternative embodiment, a waste detector is arranged on the waste branch pipe;
detecting the content value of specific gas in the waste branch pipe, comprising the following steps:
and detecting the content value of the specific gas in the waste branch pipe through a waste detector.
The waste detector needs to have a function of detecting the content of the specific gas, and if the specific gas is oxygen, the waste detector needs to have a function of detecting the content of the oxygen.
As an alternative embodiment, before determining that the radiant tube is cracked when the content value of the specific gas is lower than the preset content, the method further comprises the following steps:
repeatedly executing the step A, B for multiple times to obtain an average value of the content values of the specific gas obtained by multiple detections, and taking the average value as a final content value of the specific gas;
when the content value of the specific gas is lower than the preset content, determining that the radiant tube is cracked, wherein the method comprises the following steps:
and when the content value of the final specific gas is lower than the preset content, determining that the radiant tube is cracked.
For the content value of the specific gas, the average value of multiple measurements is taken, and the detection accuracy can be ensured.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the detection method provided by the application can be used for detecting the annealing furnace temperature, when the annealing furnace is in a shutdown state, the purging gas with the preset oxygen content is conveyed into the radiant tube through the air conveying unit for air purging, after the reserved gas in the radiant tube is cleaned, the reserved gas cannot be filled in the radiant tube, the oxygen content value in the radiant tube is detected, if the oxygen content value is lower than the preset oxygen content, the radiant tube is cracked, the furnace gas enters the radiant tube through the crack of the radiant tube, so that the oxygen content of the sweeping gas in the radiant tube is diluted by the furnace gas, the detection method is used for independently detecting each radiant tube in the annealing furnace, so that which radiant tube in the annealing furnace is cracked can be accurately positioned, and the technical problem that the cracked radiant tube cannot be accurately positioned when the cracking condition of the radiant tube of the annealing furnace is detected in the prior art is solved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The method for detecting the cracking condition of the radiant tube of the annealing furnace is characterized by being applied to the annealing furnace, wherein a plurality of radiant tubes are arranged in the annealing furnace along the furnace wall, one end of each radiant tube is provided with an air conveying unit, and the method for detecting the cracking condition of the radiant tube of the annealing furnace comprises the following steps of:
step A, when the radiant tube is in a shutdown state, controlling the air conveying unit to convey a purging gas into the radiant tube for air purging so as to clean a reserved gas in the radiant tube, wherein the purging gas is a gas containing a preset content of a specific gas, and the reserved gas is a gas in the radiant tube before the air purging is performed on the radiant tube;
b, detecting the content value of the specific gas in the radiant tube after the reserved gas is cleaned;
and C, determining that the radiant tube is cracked when the content value of the specific gas is lower than the preset content.
2. The method for detecting the cracking of the radiant tube of the annealing furnace according to claim 1, wherein the purge gas is air with an oxygen content value of 20% to 20.9%, the specific gas is the oxygen, and the preset content is 20% to 20.9%;
when the content value of the specific gas is lower than the preset content, determining that the radiant tube is cracked, wherein the determining comprises the following steps:
determining that the radiant tube is cracked when the oxygen content value in the radiant tube is lower than 20%.
3. The method for detecting the cracking of the radiant tube of the annealing furnace according to claim 2, wherein the determining that the radiant tube is cracked when the oxygen content value in the radiant tube is lower than 20% comprises:
determining that the radiant tube is slightly cracked when the oxygen content value is between 15 and 20 percent;
determining that the radiant tube is severely cracked when the oxygen content value is between 0 and 15 percent.
4. The method for detecting the cracking of the radiant tube of the annealing furnace according to claim 3, further comprising, after the detecting the content value of the specific gas in the radiant tube:
determining that the radiant tube is not cracked when the oxygen content value is between 20% and 20.9%.
5. The method for detecting the cracking of the radiant tube of the annealing furnace according to claim 2, wherein the air delivery unit comprises: the burner comprises a burner controller, an air conveying pipeline, an air electromagnetic valve and a fan, wherein the air electromagnetic valve and the fan are arranged on the air conveying pipeline;
the control of the air conveying unit to convey the purge gas into the radiant tube for air purging comprises the following steps:
and controlling the air electromagnetic valve and the fan to be opened through the burner controller, and conveying the air into the radiant tube for air purging.
6. The method for detecting the cracking of the radiant tube of the annealing furnace according to claim 1, wherein the time period of the air purge is 55 seconds to 60 seconds.
7. The method of claim 1, wherein the other end of the radiant tube is connected to a waste header through a waste branch tube, and the purge gas supplied into the radiant tube by the air supply unit is supplied into the waste header through the waste branch tube;
after the reserved gas is cleaned, detecting the content value of the specific gas in the radiant tube, wherein the detecting comprises the following steps:
and after the reserved gas is cleaned, detecting the content value of the specific gas in the waste branch pipe.
8. The method for detecting the cracking condition of the radiant tube of the annealing furnace as claimed in claim 7, wherein the waste branch tube is provided with a waste detector;
the detecting the content value of the specific gas in the waste branch pipe comprises the following steps:
and detecting the content value of the specific gas in the waste branch pipe through the waste detector.
9. The method for detecting the cracking condition of the radiant tube of the annealing furnace according to claim 1, wherein before determining that the radiant tube is cracked when the content value of the specific gas is lower than the preset content, the method further comprises the following steps:
repeatedly executing step A, B for multiple times, and taking the average value of the content values of the specific gas obtained by multiple detections as the final content value of the specific gas;
when the content value of the specific gas is lower than the preset content, determining that the radiant tube is cracked, wherein the determining comprises the following steps:
and when the content value of the final specific gas is lower than the preset content, determining that the radiant tube is cracked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010894027.5A CN112213462A (en) | 2020-08-31 | 2020-08-31 | Method for detecting cracking condition of radiant tube of annealing furnace |
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| CN202010894027.5A CN112213462A (en) | 2020-08-31 | 2020-08-31 | Method for detecting cracking condition of radiant tube of annealing furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113390571A (en) * | 2021-06-23 | 2021-09-14 | 宝武集团鄂城钢铁有限公司 | Method for efficiently and online checking cracking of non-oxidation furnace radiant tube |
| CN115902118A (en) * | 2022-12-18 | 2023-04-04 | 本钢板材股份有限公司 | Method for detecting cracking of radiant tube of annealing furnace |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109580108A (en) * | 2018-11-20 | 2019-04-05 | 王茂庭 | The online leak hunting method of non-oxidation furnace radiating pipe and its device of hydrogeneous protection gas |
| CN110672789A (en) * | 2019-09-11 | 2020-01-10 | 唐山钢铁集团有限责任公司 | Online detection method for leakage of W-shaped radiant tube of annealing furnace |
| CN110967147A (en) * | 2018-09-28 | 2020-04-07 | 宝山钢铁股份有限公司 | Online searching method for damaged radiant tube of annealing furnace |
-
2020
- 2020-08-31 CN CN202010894027.5A patent/CN112213462A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967147A (en) * | 2018-09-28 | 2020-04-07 | 宝山钢铁股份有限公司 | Online searching method for damaged radiant tube of annealing furnace |
| CN109580108A (en) * | 2018-11-20 | 2019-04-05 | 王茂庭 | The online leak hunting method of non-oxidation furnace radiating pipe and its device of hydrogeneous protection gas |
| CN110672789A (en) * | 2019-09-11 | 2020-01-10 | 唐山钢铁集团有限责任公司 | Online detection method for leakage of W-shaped radiant tube of annealing furnace |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113390571A (en) * | 2021-06-23 | 2021-09-14 | 宝武集团鄂城钢铁有限公司 | Method for efficiently and online checking cracking of non-oxidation furnace radiant tube |
| CN113390571B (en) * | 2021-06-23 | 2022-04-26 | 宝武集团鄂城钢铁有限公司 | Method for efficiently and online checking cracking of non-oxidation furnace radiant tube |
| CN115902118A (en) * | 2022-12-18 | 2023-04-04 | 本钢板材股份有限公司 | Method for detecting cracking of radiant tube of annealing furnace |
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