CN110926713A - Detection method for checking air leakage of radiant tube of non-oxidation heat treatment furnace - Google Patents
Detection method for checking air leakage of radiant tube of non-oxidation heat treatment furnace Download PDFInfo
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- CN110926713A CN110926713A CN201911194195.7A CN201911194195A CN110926713A CN 110926713 A CN110926713 A CN 110926713A CN 201911194195 A CN201911194195 A CN 201911194195A CN 110926713 A CN110926713 A CN 110926713A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a detection method for checking air leakage of a radiant tube of a non-oxidation heat treatment furnace, belonging to the field of equipment failure checking methods. The method comprises the following steps of (1) closing burners of all zones in a heat treatment furnace when the heat treatment furnace is in a furnace ignition state; reducing the residual oxygen amount in the heat treatment furnace to a specified value, and igniting each burner zone by zone; detecting residual oxygen in the thermal treatment furnace after the single-zone burner is ignited, and judging whether the residual oxygen is higher than a specified value of the residual oxygen; and closing the air inlet pipeline of the burner of the heat treatment furnace higher than the specified value of the residual oxygen amount, and completing detection and maintenance. The detection method for checking the air leakage of the radiant tube of the non-oxidation heat treatment furnace provided by the invention has few checking limiting conditions and almost no influence on production. When in production, after the radiant tube leaks, the furnace does not need to be shut down, the temperature does not need to be reduced, the radiant tube does not need to enter the furnace for inspection, the radiant tube can be inspected only when the heat treatment furnace is in an in-furnace state, and the radiant tube is not influenced by the temperature of the furnace.
Description
Technical Field
The invention relates to a detection method for checking air leakage of a radiant tube of a non-oxidation heat treatment furnace, belonging to the field of equipment failure checking methods.
Background
The heat treatment of the steel plate roll mark is an industrial problem, and the problem troubles the stable quality and smooth production of the heat treatment for a long time. The measures for controlling the roll mark of the steel plate are mainly two: the shot blasting quality of the surface of the steel plate is good, namely, the shot blasting of oxide skin on the surface of the steel plate before the steel plate enters a furnace is thorough; secondly, the interior of the heat treatment furnace is in non-oxidation atmosphere, and the steel plate after shot blasting does not have secondary oxidation in the furnace. The non-oxidation heat treatment furnace is a radiant tube type heating furnace, the protective atmosphere in the furnace is nitrogen, the concentration of N2 in the furnace needs to reach more than 99.9 percent during production, namely the residual oxygen content is maintained within 500ppm, and the surface of the steel plate after heat treatment can be guaranteed to be smooth and have no roll marks.
Generally, incomplete shot blasting of the steel plate is easy to find and solve. After the radiant tube leaks gas, the residual oxygen in the furnace rises violently, and a steel plate is normalized and oxidized, so that the furnace roller is nodulated. After nodulation, the treatment difficulty is very high, and in most cases, the furnace needs to be shut down, thus seriously restricting the smooth production.
The method for checking the air leakage of the radiant tube in the early stage mainly has the following 3 problems.
1. The checking has large limit condition and difficulty. The furnace is stopped and cooled, the furnace is put into the furnace for inspection, the air leakage of the radiant tube is observed by naked eyes, the detection is difficult, especially the part wrapped by the refractory material of the furnace wall and the position contacted with the hanger in the furnace cannot be observed at all, and the position of a leakage point cannot be confirmed by naked eyes.
2. The positioning precision is poor, and the cost is high with wasting time and energy. The original inspection method is to pull out part of the radiant tubes suspected to be in fault from the furnace one by one for inspection, replace the radiant tubes with faults, reinstall the radiant tubes without faults, the labor intensity is very high, generally, the time for disassembling and assembling one radiant tube is more than 2 hours, the number of the existing burners of a No. 1 furnace is 268 sets, two grades of people construct the radiant tubes simultaneously, and the time consumed for disassembling and assembling is at least more than 10 days.
3. The safety risk is large, and the equipment damage is large. The original method has high labor intensity, the single weight of the burner and the radiant tube is more than 300 kilograms, the safety problem is easy to occur when the burner and the radiant tube are matched with a travelling crane for dismounting, and the dismounting has large damage to refractory materials and an equipment body.
Disclosure of Invention
The invention provides a detection method for checking air leakage of a radiant tube of a non-oxidation heat treatment furnace aiming at the problems.
The invention adopts the following technical scheme:
the invention relates to a detection method for checking air leakage of a radiant tube of a non-oxidation heat treatment furnace, which comprises the following detection steps:
step one, the heat treatment furnace is in a furnace ignition state, and burners of all zones in the heat treatment furnace are closed;
step two, reducing the residual oxygen amount in the heat treatment furnace to a specified value, and igniting each burner zone by zone;
detecting residual oxygen in the heat treatment furnace after the single-zone burner is ignited, and judging whether the residual oxygen is higher than a specified value of the residual oxygen;
and step four, closing the burner air inlet pipeline of the heat treatment furnace higher than the specified value of the residual oxygen amount, and completing detection and maintenance.
2. The detection method for inspecting the air leakage of the radiant tube of the non-oxidation heat treatment furnace according to claim 1, wherein the detection method comprises the following steps: and in the second step, the residual oxygen amount in the heat treatment furnace is reduced to a specified value of 500 ppm.
3. The detection method for inspecting the air leakage of the radiant tube of the non-oxidation heat treatment furnace according to claim 1, wherein the detection method comprises the following steps: in the second step, the treatment furnace is a single-zone ignition burner, and the burner is in a fully open state; the burning time duration of the burner is 3 min.
4. The detection method for inspecting the air leakage of the radiant tube of the non-oxidation heat treatment furnace according to claim 3, wherein the detection method comprises the following steps: after each single-zone burner of the treatment furnace, the residual oxygen content is more than or equal to 1000 ppm; and judging that the burners in the area are in a gas leakage state.
5. The detection method for inspecting the air leakage of the radiant tube of the non-oxidation heat treatment furnace according to claim 3, wherein the detection method comprises the following steps: and step four, after determining that the burner radiant tube in the area is in a damaged state, closing the burner and filling nitrogen into the heat treatment furnace until the residual oxygen amount is reduced to a specified value.
Advantageous effects
The detection method for checking the air leakage of the radiant tube of the non-oxidation heat treatment furnace provided by the invention has few checking limiting conditions and almost no influence on production. When in production, after the radiant tube leaks, the furnace does not need to be shut down, the temperature does not need to be reduced, the radiant tube does not need to enter the furnace for inspection, the radiant tube can be inspected only when the heat treatment furnace is in an in-furnace state, and the radiant tube is not influenced by the temperature of the furnace.
According to the detection method for checking the air leakage of the radiant tube of the non-oxidation heat treatment furnace, if the radiant tube leaks air in the combustion state of the burner, the residual oxygen amount changes within 2-5 min. Usually, the residual oxygen content is increased from 500ppm to over 1000ppm, and then, the residual oxygen content has no downward trend, so that the leakage of the radiant tube can be confirmed, the basis of fault judgment can be quantized, and the operation is convenient.
The detection method for checking the gas leakage of the radiant tube of the non-oxidation heat treatment furnace combines the change of the residual oxygen quantity, and the checking range is from large to small and from large to small. Gradually reducing the checking range to the final positioning. Namely, the fault area is firstly positioned and reduced from a plurality of areas to one area. And then positioning the plurality of radiant tubes in the area to a single leaky radiant tube, and finally confirming the total number of the leaky radiant tubes. By adopting the new method, only one person is needed, the time is consumed for 1-4 h, the positioning can be rapidly and accurately carried out, and the production is hardly influenced. The method is scientific and precise, has high positioning precision, avoids discharge leakage, saves trouble and labor, and has extremely low cost
The detection method for checking the air leakage of the radiant tube of the non-oxidation heat treatment furnace provided by the invention is safe and reliable, and has no damage to equipment. The new method has no temporary dismounting operation, and does not cause safety problems and equipment damage.
According to the detection method for checking the air leakage of the radiant tube of the non-oxidation heat treatment furnace, after the checking method is implemented, the checking is carried out twice in one year, compared with the original checking method, the time can be saved by 20 days in one year, and the cost is saved by 200 ten thousand yuan per year according to the calculation of the productivity of the furnace and the profit of steel per ton.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly and completely described. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
A detection method for checking air leakage of a radiant tube of a non-oxidation heat treatment furnace comprises the following detection steps:
step one, the heat treatment furnace is in a furnace ignition state, and burners of all zones in the heat treatment furnace are closed; the guarantee condition when troubleshooting the faulty radiant tube is 1, the heat treatment furnace is in a furnace ignition state; 2. the residual oxygen analyzer works normally; 3. the nitrogen output is in a normal supply state; 4. the furnace top hot nitrogen diffusion pipeline is in a closed state; 5. the furnace door is closed and the compaction state is normal.
And step two, checking after the gas leakage burner occurs, and zeroing the output of the burner through an operation console, namely, in a completely closed state. After the residual oxygen amount is reduced to be below 500ppm, starting to ignite the burners zone by zone, setting the output pulse of the burners to be 100 percent, and ensuring that all the originally burning burners are in a burning state after the burners in the zone are opened. And observing the change condition of the residual oxygen analyzer, if the residual oxygen content is still maintained within 500ppm, indicating that the burner of the area is intact, and immediately checking the next area. Note that: after one area is opened, the other area is prohibited to be opened, the other area does not have a result, and the other area is prohibited to be opened.
Detecting the residual oxygen amount in the area of the point burner, and judging whether the residual oxygen amount is higher than a specified value of the residual oxygen amount before detection; and judging the basis of the fault and positioning the fault area. When the burner of the investigation area is in a full-open state, the duration time of the combustion state is more than 3min, the residual oxygen content is increased to more than 1000ppm, and the condition that the burner leaks gas in the area is judged.
And step four, closing a burner air inlet pipeline of the heat treatment furnace with the residual oxygen amount higher than the specified value before detection, and completing detection and overhauling.
The invention relates to a detection method for checking the air leakage of a radiant tube of a non-oxidation heat treatment furnace, which is characterized in that after each single-zone burner of the heat treatment furnace is combusted, the residual oxygen content of the single-zone burner is more than or equal to 1000ppm, and the burners in the zone are judged to be in an air leakage state. After the fault area is determined, the residual oxygen in the furnace rises, so that the residual oxygen in the furnace is quickly reduced to be within 500ppm, and the fault troubleshooting time is saved. And (3) changing the nitrogen output in the furnace into manual operation on an operation picture along with closing all the burners to ensure that the instantaneous flow reaches more than 1000m3/h, and performing troubleshooting on the failed burners after the residual oxygen content is reduced to be within 500 ppm.
The invention relates to a detection method for checking the air leakage of a radiant tube of a non-oxidation heat treatment furnace, which comprises the following steps of determining that a burner in the area is in a leakage state, and positioning a fault radiant tube in a fault area. And ensuring that the burners of other areas are in a closed state, opening the burners of the fault area one by one, and forbidding the other burners of the fault area to be opened when whether one radiant tube leaks air or not is not confirmed to be finished. And after one burner is started, observing the change condition of the residual oxygen, and if the residual oxygen is still maintained within 500ppm, indicating that the radiant tube is intact. If the combustion state continues and the residual oxygen amount rises to 1000ppm or more, the leakage of the radiant tube is confirmed (after the failure zone is determined, the zone may be confirmed in groups of 5 in order to save time). In a production state, a temporary treatment method for the leakage of the radiant tube comprises the following steps: the faulty radiant tube is replaced only in a furnace shutdown state, and is usually temporarily treated so as not to affect the production smooth-going. Namely, the burner is changed into a closed state on an operation picture, meanwhile, hand valves of gas and air of the burner are closed on site, and an electrode cooling air pipe is pulled out.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A detection method for checking air leakage of a radiant tube of a non-oxidation heat treatment furnace is characterized by comprising the following steps: the detection steps are as follows:
step one, the heat treatment furnace is in a furnace ignition state, and burners of all zones in the heat treatment furnace are closed;
step two, reducing the residual oxygen amount in the heat treatment furnace to a specified value, and igniting each burner zone by zone;
detecting residual oxygen in the heat treatment furnace after the single-zone burner is ignited, and judging whether the residual oxygen is higher than a specified value of the residual oxygen;
and step four, closing the burner air inlet pipeline of the heat treatment furnace higher than the specified value of the residual oxygen amount, and completing detection and maintenance.
2. The detection method for inspecting the air leakage of the radiant tube of the non-oxidation heat treatment furnace according to claim 1, wherein the detection method comprises the following steps: and in the second step, the residual oxygen amount in the heat treatment furnace is reduced to a specified value of 500 ppm.
3. The detection method for inspecting the air leakage of the radiant tube of the non-oxidation heat treatment furnace according to claim 1, wherein the detection method comprises the following steps: in the second step, the heat treatment furnace is a single-zone ignition burner, and the burner is in a fully open state; the burning time duration of the burner is 3 min.
4. The detection method for inspecting the air leakage of the radiant tube of the non-oxidation heat treatment furnace according to claim 3, wherein the detection method comprises the following steps: after each single-zone burner of the heat treatment furnace burns, the residual oxygen content is more than or equal to 1000 ppm; and judging that the burners in the area are in a gas leakage state.
5. The detection method for inspecting the air leakage of the radiant tube of the non-oxidation heat treatment furnace according to claim 3, wherein the detection method comprises the following steps: and step four, after determining that the burner radiant tube in the area is in a damaged state, closing the burner and filling nitrogen into the heat treatment furnace until the residual oxygen amount is reduced to a specified value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911194195.7A CN110926713A (en) | 2019-11-28 | 2019-11-28 | Detection method for checking air leakage of radiant tube of non-oxidation heat treatment furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911194195.7A CN110926713A (en) | 2019-11-28 | 2019-11-28 | Detection method for checking air leakage of radiant tube of non-oxidation heat treatment furnace |
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| CN110926713A true CN110926713A (en) | 2020-03-27 |
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| CN201911194195.7A Pending CN110926713A (en) | 2019-11-28 | 2019-11-28 | Detection method for checking air leakage of radiant tube of non-oxidation heat treatment furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358299A (en) * | 2021-05-13 | 2021-09-07 | 武汉钢铁有限公司 | Rapid detection method for breakage of radiant tube of cold rolling continuous annealing furnace |
| 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 |
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| CN103063806A (en) * | 2012-12-18 | 2013-04-24 | 秦皇岛首秦金属材料有限公司 | Method for detecting abnormity of remaining oxygen in thermal treatment furnace |
| CN103574292A (en) * | 2013-11-14 | 2014-02-12 | 武汉钢铁(集团)公司 | Method for fast positioning leaking point of non-oxidation thermal treatment furnace radiant tube on line |
| CN109161659A (en) * | 2018-09-25 | 2019-01-08 | 湖南华菱湘潭钢铁有限公司 | Roller hearth heat-treated furnace radiant tube on-line measuring device and its detection method |
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2019
- 2019-11-28 CN CN201911194195.7A patent/CN110926713A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1549892A (en) * | 2001-09-28 | 2004-11-24 | 大众汽车有限公司 | Method for identifying a leak in the intake port of an internal combustion engine and an internal combustion engine that is equipped accordingly |
| CN103063806A (en) * | 2012-12-18 | 2013-04-24 | 秦皇岛首秦金属材料有限公司 | Method for detecting abnormity of remaining oxygen in thermal treatment furnace |
| CN103574292A (en) * | 2013-11-14 | 2014-02-12 | 武汉钢铁(集团)公司 | Method for fast positioning leaking point of non-oxidation thermal treatment furnace radiant tube on line |
| CN109161659A (en) * | 2018-09-25 | 2019-01-08 | 湖南华菱湘潭钢铁有限公司 | Roller hearth heat-treated furnace radiant tube on-line measuring device and its detection method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358299A (en) * | 2021-05-13 | 2021-09-07 | 武汉钢铁有限公司 | Rapid detection method for breakage of radiant tube of cold rolling continuous annealing furnace |
| 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 |
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