CN115584384A - Method and system for processing high-temperature test incompatibility of bell-type furnace - Google Patents
Method and system for processing high-temperature test incompatibility of bell-type furnace Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000012545 processing Methods 0.000 title claims description 10
- 239000001257 hydrogen Substances 0.000 claims abstract description 181
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 181
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 132
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 66
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 54
- 239000010959 steel Substances 0.000 claims abstract description 54
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 42
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 41
- 238000001816 cooling Methods 0.000 claims abstract description 30
- 238000010926 purge Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000004886 process control Methods 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 20
- 230000007547 defect Effects 0.000 abstract description 11
- 230000003647 oxidation Effects 0.000 abstract description 6
- 238000007254 oxidation reaction Methods 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 6
- 238000007599 discharging Methods 0.000 abstract description 4
- 230000010485 coping Effects 0.000 abstract description 3
- 238000000137 annealing Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 7
- 239000012298 atmosphere Substances 0.000 description 4
- 239000002360 explosive Substances 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/663—Bell-type furnaces
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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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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- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
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Abstract
The invention relates to the technical field of bell-type furnace testing, and solves the problems of inappropriate high-temperature testing such as steel coil quality defect, cooling speed reduction, yield reduction and the like caused by hydrogen exchange of a furnace platform of a bell-type furnace after nitrogen purging, in particular to a treatment method and a system for inappropriate high-temperature testing of the bell-type furnace, which comprises the step of carrying out condition checking preparation work before treatment; adjusting the preorder valve assembly; starting a hydrogen exchange process; performing process control management of hydrogen exchange operation; and ending the steel coil in the furnace. According to the invention, after nitrogen purging, whether the furnace platform meets the hydrogen exchange condition is checked, and nitrogen is exchanged by hydrogen, because hydrogen has reducibility and good heat conductivity coefficient, the oxidation color defect on the surface of the steel coil can be effectively avoided, the cooling and discharging speed of the steel coil can be increased, the production efficiency is improved, and an effective coping treatment method is not provided for the high-temperature test of the bell-type furnace.
Description
Technical Field
The invention relates to the technical field of bell-type furnace testing, in particular to a method and a system for processing high-temperature testing incompatibility of a bell-type furnace.
Background
The traditional bell-type furnace uses the nitrogen-hydrogen mixed gas as a protective medium, and the hydrogen has the advantages of good thermal conductivity, small density, small dynamic viscosity, strong reducibility and the like compared with the nitrogen, so that the traditional bell-type furnace gradually replaces the traditional nitrogen-hydrogen mixed gas as the protective gas; in order to improve the production efficiency and the surface quality of steel coils, the prior bell-type furnace annealing process basically adopts hydrogen as protective atmosphere. Meanwhile, the safety control requirement of the bell-type furnace adopting hydrogen as protective atmosphere is stricter.
The method is characterized in that hydrogen is easy to leak, flammable and explosive, so that all bell-type furnace benches need to be subjected to high-temperature tests to detect the air tightness of the bell-type furnaces, after the bell-type furnaces are unqualified in the leakage tests, the furnace inner space is swept by nitrogen, and the nitrogen is used for replacing the hydrogen. The dew point of nitrogen is higher than that of hydrogen, and the nitrogen has no reducibility, so that the oxidation color defect of the steel coil is easily caused; meanwhile, the heat conductivity coefficient of nitrogen is 1/7 of that of hydrogen, so that the cooling speed is greatly reduced, and the production yield of the bell-type furnace is seriously influenced, so that an inappropriate treatment method and system for high-temperature test of the bell-type furnace are urgently needed to solve the problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method and a system for processing the unqualified high-temperature test of a bell-type furnace, aiming at controlling the cooling speed by judging the hydrogen exchange condition of the bell-type furnace and carrying out the hydrogen exchange operation, improving the surface quality of the steel coil of the bell-type furnace and solving the problems of unqualified high-temperature test such as the quality defect of the steel coil, the reduction of the cooling speed, the reduction of the yield and the like caused by the fact that the hydrogen exchange is not carried out after a furnace platform of the bell-type furnace is purged by nitrogen.
In order to achieve the purpose, the invention provides the following technical scheme: a method for treating a high-temperature test mismatch of a bell-type furnace comprises the following steps,
carrying out pretreatment condition check preparation work: purging the bell-type furnace with nitrogen to remove air in the inner cover and the pipeline, and checking the hydrogen-replaceable condition of the furnace platform; adjusting the preorder valve assembly; starting a hydrogen exchange process; performing process control management of hydrogen exchange operation; and ending the steel coil in the furnace.
Preferably, said valve assembly comprises: a hydrogen inlet valve, a hydrogen outlet valve and a nitrogen inlet ball valve.
Preferably, the adjusting step of the valve assembly of the preamble comprises: firstly, operating a relay to open a hydrogen inlet valve; then operating the relay to open the hydrogen outlet valve; then the nitrogen inlet valve was manually closed; and finally, manually adjusting the circulating fan to enable the rotating speed of the circulating fan to be in a low-speed gear of 750 r/h.
Preferably, the hydrogen exchange process comprises: firstly, opening a hydrogen servo valve; then the opening degree of the hydrogen servo valve is adjusted to ensure that the hydrogen flow passing through the hydrogen servo valve reaches 25m 3 /h。
Preferably, the process control management of the hydrogen exchange operation includes the steps of: measuring the time for hydrogen to enter the bell-type furnace through the hydrogen inlet valve, the hydrogen outlet valve and the hydrogen servo valve to replace nitrogen; after the nitrogen is replaced by the hydrogen for one hour, manually closing a hydrogen outlet valve and a hydrogen servo valve; and switching the circulating fan to an automatic control mode, and operating the circulating fan at a high speed of 1700r/h to cool the hydrogen in the bell-type furnace.
Preferably, the ending treatment performed on the steel coil in the furnace comprises: the furnace platform is purged in the later period by nitrogen, and hydrogen in the inner cover is removed; cooling the furnace platform to a set tapping temperature value; removing the cooling cover, loosening and removing the inner cover; and (4) hanging the steel coil out of the bell-type furnace and transferring the steel coil to a specified area.
Preferably, the hydrogen-exchangeable conditions of the furnace platform include: pressure fluctuation in the furnace is stable, and the positive and negative pressure does not exceed 3mbar; gas leakage rate less than 0.4m 3 /h。
The invention also provides a treatment system for the unqualified high-temperature test of the bell-type furnace, which comprises the following components: a verification unit: the system is used for carrying out pre-treatment condition checking preparation work, and checking the hydrogen-replaceable condition of a furnace platform after carrying out emergency purging on a bell type furnace which is not tested at high temperature;
a first operation unit: for adjusting the preorder valve assembly;
a second operation unit: for starting the hydrogen exchange process;
an adjustment unit: process control management for performing hydrogen exchange operations;
a third operation unit: used for ending the steel coil in the furnace.
Preferably, the first operation unit comprises the following steps when in operation:
firstly, operating a relay to open a hydrogen inlet valve;
then operating the relay to open the hydrogen outlet valve;
then the nitrogen inlet valve was manually closed;
and finally, manually adjusting the circulating fan to enable the rotating speed of the circulating fan to be in a low-speed gear of 750 r/h.
Preferably, the second operation unit comprises the following steps when in operation,
opening a hydrogen servo valve;
adjusting the opening of the hydrogen servo valve;
detecting whether the hydrogen flow rate passing through the hydrogen servo valve reaches 25m 3 H; the hydrogen flow reaches 25m 3 At the time of/h, the operation of the second operation unit is finished, and the hydrogen flow rate does not reach 25m 3 When the hydrogen flow reaches 25m, the opening of the hydrogen servo valve is continuously and repeatedly adjusted and detected until the hydrogen flow passing through the hydrogen servo valve reaches 25m 3 /h。
Compared with the prior art, the invention provides a method and a system for treating the unqualified bell-type furnace in the high-temperature test, which have the following beneficial effects:
1. and (3) carrying out high-temperature test on the bell-type furnace: after the airtightness of the furnace body is detected to be not in accordance with the specification, nitrogen purging is carried out to discharge air in the inner cover and the pipeline, so that the steel coil is processed in the nitrogen atmosphere in the subsequent steps, the defect of oxidation color on the surface of the steel coil is caused, and the annealing cooling speed of the steel coil is slow; according to the invention, after nitrogen purging, whether the furnace platform meets the hydrogen exchange condition is checked, and nitrogen is exchanged by hydrogen, because hydrogen has reducibility and good heat conductivity coefficient, the oxidation color defect on the surface of the steel coil can be effectively avoided, the cooling and discharging speed of the steel coil can be increased, the production efficiency is improved, and an effective coping treatment method is not provided for the high-temperature test of the bell-type furnace.
2. The method clearly indicates the judgment condition for judging the replaceable hydrogen of the furnace platform of the bell type furnace when the condition check preparation work before the treatment is carried out for coping with the mismatching of the high-temperature test of the bell type furnace; specifically, the method comprises the following steps: pressure fluctuation in the furnace is stable, and the positive and negative pressure does not exceed 3mbar; gas leakage rate less than 0.4m 3 H; judging whether the pressure and gas leakage data in the conditions are from the actual production condition, when the pressure fluctuation in the furnace exceeds 3mbar, gas flow exists between an inner cover of the bell-type furnace and a furnace platform, the leakage is caused, and when the gas leakage is less than 0.4m 3 And in the case of/h, emergency purging cannot be generated, and the full hydrogen annealing production can be realized. Accurate and reliable reference basis is provided for the bell-type furnace to carry out hydrogen exchange after nitrogen purging, leakage caused by forced replacement of inflammable and explosive hydrogen is prevented, and safety production risk can be effectively avoided.
3. According to actual conditions of gas atmosphere in the two-stage bell-type furnace, such as adjustment of a valve assembly in the preorder, control and management of a hydrogen exchange operation process and the like, considering the actual difference that the specific gravity of nitrogen is 14 times that of hydrogen, and respectively indicating the suitable feasible operation rate of the two-stage circulating fan; when the preorder valve component is adjusted, because residual nitrogen exists in the furnace, the rotating speed of the circulating fan is indicated to be lower rotating speed of about 750 revolutions per hour according to actual production conditions, in the process control and management stage of hydrogen exchange operation, after the nitrogen is replaced by hydrogen for one hour, the nitrogen is basically replaced by the hydrogen, the rotating speed of the circulating fan is increased to about 1700 revolutions per hour, and the overload burning loss of the motor is prevented while the cooling speed is ensured. In the whole operation period of the bell-type furnace in which the high-temperature test is not appropriate, clear guidance is reasonably provided for the proper rotating speed of the circulating fan according to actual conditions.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 shows a schematic view of the cooling (temperature-time) of a furnace platform for hydrogen exchange after nitrogen purging of a bell furnace according to an embodiment of the invention;
FIG. 2 shows a schematic view of the cooling (temperature-time) of the furnace platform without hydrogen exchange after nitrogen purging in a bell furnace according to the prior art.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The traditional bell-type furnace uses the nitrogen-hydrogen mixed gas as a protective medium, but the hydrogen has the advantages of good thermal conductivity, small density, small dynamic viscosity, strong reducibility and the like compared with the nitrogen, and gradually replaces the nitrogen-hydrogen mixed gas as the protective gas; meanwhile, it puts more strict requirements on the safety control of the bell-type furnace.
At present, hydrogen is basically used as a protective atmosphere in the annealing process of the bell-type furnace to improve the production efficiency of the steel coil and ensure the surface quality of the steel coil. Because hydrogen is easy to leak, inflammable and explosive, all the bell-type furnace hearths need to be subjected to high-temperature test after heating and heat preservation are finished, and the hearths which are not subjected to high-temperature test need to be replaced by nitrogen. The main equipment of the bell-type furnace comprises a furnace platform, a valve station, an inner cover, a heating cover and a cooling cover; the specific working flow of the prior bell-type furnace in use is as follows:
the method comprises the following steps: when the annealing cycle begins, checking the positions of all the instruments and switches to make all the instruments and switches be placed at the correct set positions; step two: fixing the inner cover on the furnace platform by using a hydraulic pressing device; step three: in order to ensure the safety, a high-temperature test is needed, the airtightness of the bell-type furnace is quantitatively evaluated through the high-temperature test to judge whether a leakage point exists in the bell-type furnace or not, so that the complete sealing of a furnace platform and an inner cover system is ensured, and the airtightness of the bell-type furnace is detected; in addition, air in the inner cover and the pipeline can be discharged through nitrogen purging, the safety of the system is further ensured, and the subsequent steps can be carried out by keeping the oxygen content in the inner cover below 1 percent; step four: the heating cover is buckled, and the burner is ignited to heat the steel coil, so that the heating of the steel coil relates to a complex process and needs to be matched with a set process temperature curve; removing the heating cover after heating is finished, and hoisting the cooling cover for forced refrigeration; then starting nitrogen to carry out later-stage blowing, and removing hydrogen in the inner cover; when the cooling reaches the set value, the cooling cover on the outer side is removed, and then the inner cover is loosened and removed.
In the third step, the space in the furnace is purged by nitrogen, and the nitrogen replaces the hydrogen; after the step three is completed, the step four is carried out, and the steel coil is heated; at the moment, the furnace platform is in a nitrogen atmosphere, the dew point of nitrogen is higher than that of hydrogen, and the nitrogen does not have reducibility, so that the oxidation color defect of the steel coil is easily caused. Meanwhile, the heat conductivity coefficient of nitrogen is 1/7 of that of hydrogen, so that the cooling speed is obviously reduced, and the production yield of the bell-type furnace is seriously influenced; therefore, a corresponding treatment method needs to be provided to solve the problem of improper test.
As shown in fig. 1, a schematic diagram of the top cooling (temperature-time) for hydrogen exchange after nitrogen purging is shown for top temperature test failure of the bell-type furnace, satisfying hydrogen exchange operating conditions; the data in the figure is an illustration of relevant parameters of actual production, after the airtightness test of the cover type furnace is unqualified and nitrogen purging is carried out, a heating cover is buckled, a burner is ignited to heat a steel coil, and the steel coil is heated for 9 hours from the room temperature of 25 ℃ to reach 710 ℃; and then keeping the steel coil at 710 ℃ for 9 hours, then discharging the steel coil after the steel coil is cooled to 110 ℃, and after nitrogen purging, in order to avoid the surface oxidation color defect of the steel coil, the practice shows that after the furnace platform is confirmed to meet the hydrogen change operation condition, and the steel coil is cooled from 710 ℃ to 110 ℃ for only 19 hours after hydrogen change treatment.
FIG. 2 is a schematic view showing the cooling (temperature-time) of the top of the bell type furnace, which does not meet the hydrogen change operation conditions due to the failure of the high temperature test of the top, and does not perform hydrogen change after nitrogen purging; the data in the figure is a schematic diagram of relevant parameters in actual production, and a steel coil is heated for 9 hours and is increased from room temperature of 25 ℃ to 710 ℃; and then keeping the steel coil at 710 ℃ for 9 hours, and then discharging the steel coil out of the furnace after the steel coil is cooled to 110 ℃, wherein the steel coil is not cooled from 710 ℃ to 110 ℃ in actual production and 43.5 hours are consumed because the furnace platform does not meet the hydrogen changing operation conditions and does not carry out corresponding hydrogen changing treatment.
As can be seen from a comparison of fig. 1 and 2: the time for cooling the steel coil from 710 ℃ to 110 ℃ can be effectively shortened through the hydrogen exchange operation, the cooling time is 19 hours and is shortened by 24.5 hours compared with 43.5 hours, the production time of the steel coil of the bell-type furnace can be effectively shortened by 24.5 hours, the heat conductivity coefficient of nitrogen is 1/7 of that of hydrogen, the cooling speed of the nitrogen is greatly reduced, and the production yield of the bell-type furnace is seriously influenced. Meanwhile, because the hydrogen has reducibility, the annealed steel coil subjected to the hydrogen exchange treatment represented in the figure 1 has a brighter surface than the annealed steel coil not subjected to the hydrogen exchange treatment represented in the figure 2; the dew point of nitrogen is higher than that of hydrogen, and nitrogen has no reducibility, so that the surface of the annealed steel coil shown in figure 2 has oxidation color defects.
The invention provides a method and a system for processing the unqualified high-temperature test of a bell-type furnace, which improve the surface quality and the production efficiency of a steel coil of the bell-type furnace by hydrogen exchange operation and cooling speed adjustment; the processing method comprises the following steps: (1) carrying out pretreatment condition check preparation work: purging the bell-type furnace with nitrogen to remove air in the inner cover and the pipeline, and checking the hydrogen-replaceable condition of the furnace platform; (2) adjusting the preorder valve assembly; (3) starting a hydrogen exchange process; (4) carrying out process control management of hydrogen exchange operation; and (5) ending the steel coil in the furnace. The preamble valve assembly comprises: a hydrogen inlet valve, a hydrogen outlet valve and a nitrogen inlet ball valve. When hydrogen is exchanged, the hydrogen flows through the hydrogen inlet valve in sequence
The adjusting step of the valve assembly comprises: firstly, operating a relay to open a hydrogen inlet valve; (2) operating the relay again to open the hydrogen outlet valve; (3) then manually closing the nitrogen inlet valve; (4) And finally, manually adjusting the circulating fan to enable the rotating speed of the circulating fan to be in a low-speed gear of 750 revolutions per hour, operating the circulating fan at a low rotating speed of 750r/h (revolutions per hour), and still storing residual nitrogen in the furnace, wherein the specific gravity of the nitrogen is 14 times that of the hydrogen, so that the circulating fan can only be operated at a low speed before the nitrogen is not replaced, and the risk of overload and burning loss of a motor exists during high-speed operation. The hydrogen exchange process comprises the following steps: firstly, opening a hydrogen servo valve; then the opening degree of the hydrogen servo valve is adjusted to enable the hydrogen flow rate passing through the hydrogen servo valve to reach 25m 3 /h。
The process control management of the hydrogen change operation includes the steps of: (1) Measuring the time for hydrogen to enter the bell-type furnace through the hydrogen inlet valve, the hydrogen outlet valve and the hydrogen servo valve to replace nitrogen; (2) After the nitrogen is replaced by the hydrogen for one hour, manually closing a hydrogen outlet valve and a hydrogen servo valve; (3) And switching the circulating fan to an automatic control mode, and operating the circulating fan at a high speed of 1700r/h (revolutions per hour) to cool the hydrogen in the bell-type furnace. Because the replacement time of the nitrogen by the hydrogen is up to one hour, the nitrogen in the bell-type furnace is basically replaced by the hydrogen at the moment, the specific gravity of the hydrogen is smaller, and the specific gravity of the hydrogen is about 1/14 of that of the nitrogen, the circulating fan can be operated at a high speed at the moment, and the probability of overload burning loss of a motor of the circulating fan is lower.
The ending treatment of the steel coil in the furnace comprises the following steps: (1) The furnace platform is purged in the later period by nitrogen, and hydrogen in the inner cover is removed; (2) cooling the furnace platform to a set tapping temperature value; (3) removing the cooling cover, loosening and removing the inner cover; (4) And (4) hanging the steel coil out of the bell-type furnace and transferring the steel coil to a specified area.
The hydrogen-replaceable conditions of the furnace platform comprise: (1) the pressure fluctuation in the furnace is stable, and the positive and negative pressure is not more than 3mbar; according to the actual production situation on site, when the pressure fluctuation in the furnace exceeds 3mbar, gas flow exists between an inner cover of the bell-type furnace and a furnace platform, and the condition of leakage is caused;(2) Gas leakage rate less than 0.4m 3 H, according to the actual production situation on site, when the gas leakage amount is less than 0.4m 3 In the hour, emergency purging is not generated, the full hydrogen annealing production can be realized, but the gas leakage in the furnace is more than or equal to 0.4m 3 In the case of the reaction,/h, emergency purging may occur, leakage may occur between the inner cover of the bell type furnace and the hearth, and only nitrogen annealing production may be performed). Because hydrogen is flammable and explosive gas, leakage can be caused after forced hydrogen exchange, and safety risks exist, whether the bell-type furnace meets corresponding hydrogen exchange conditions or not must be checked, and hydrogen exchange can be carried out only when the bell-type furnace meets the hydrogen exchange conditions.
The processing system comprises: (1) a verification unit: the system is used for carrying out the preparation work of condition checking before treatment, and checking the hydrogen changeable condition of a furnace platform after carrying out emergency purging on the bell type furnace which is not tested at high temperature; (2) a first operation unit: adjusting the preorder valve assembly; (3) a second operation unit: starting a hydrogen exchange process; (4) an adjusting unit: performing process control management of hydrogen exchange operation; (5) a third operation unit: and ending the steel coil in the furnace.
The first operation unit comprises the following steps when in operation: firstly, operating a relay to open a hydrogen inlet valve; then operating the relay to open the hydrogen outlet valve; then the nitrogen inlet valve was manually closed; and finally, manually adjusting the circulating fan to enable the rotating speed of the circulating fan to be in a low-speed gear of 750 revolutions per hour. The second operating unit comprises the following steps when in operation: opening a hydrogen servo valve; adjusting the opening of a hydrogen servo valve; detecting whether the hydrogen flow rate passing through the hydrogen servo valve reaches 25m 3 H; the hydrogen flow reaches 25m 3 At the time of/h, the operation of the second operation unit is finished, and the hydrogen flow rate does not reach 25m 3 When the hydrogen flow reaches 25m, the opening of the hydrogen servo valve is continuously and repeatedly adjusted and detected until the hydrogen flow passing through the hydrogen servo valve reaches 25m 3 /h。
The invention provides a treatment method and a treatment system for disqualification of high-temperature test of a bell-type furnace, which control the cooling speed by judging the hydrogen exchange condition of the bell-type furnace and carrying out the hydrogen exchange operation, improve the surface quality of a steel coil produced in the bell-type furnace, and effectively avoid the problems of disqualification of the high-temperature test, such as quality defect of the steel coil, reduction of the cooling speed, yield reduction and the like, caused by the fact that hydrogen exchange is not carried out after a furnace platform of the bell-type furnace is purged by nitrogen.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for treating a high-temperature test unqualified bell-type furnace is characterized by comprising the following steps of,
carrying out pre-treatment condition check preparation work: purging nitrogen in the bell-type furnace to remove air in the inner cover and the pipeline and checking the hydrogen replaceable condition of the furnace platform;
adjusting the preorder valve assembly;
starting a hydrogen exchange process;
performing process control management of hydrogen exchange operation;
and ending the steel coil in the furnace.
2. The method of claim 1, wherein the valve assembly of the preamble comprises: a hydrogen inlet valve, a hydrogen outlet valve and a nitrogen inlet ball valve.
3. The method for treating a high temperature sub-test in a bell furnace according to claim 1 or 2, wherein the adjusting step of the valve assembly comprises the following steps:
firstly, operating a relay to open a hydrogen inlet valve;
then operating the relay to open the hydrogen outlet valve;
then the nitrogen inlet valve was manually closed;
and finally, manually adjusting the circulating fan to enable the rotating speed of the circulating fan to be in a low-speed gear of 750 r/h.
4. The method for treating the high-temperature test mismatch of the bell-type furnace according to claim 1, wherein the hydrogen exchange process comprises the following steps: firstly, opening a hydrogen servo valve; then the opening degree of the hydrogen servo valve is adjusted to ensure that the hydrogen flow passing through the hydrogen servo valve reaches 25m 3 /h。
5. The method for processing the hot test failure of the bell type furnace as recited in claim 1, wherein the process control management of the hydrogen exchange operation comprises the following steps:
measuring the time for hydrogen to enter the bell-type furnace through the hydrogen inlet valve, the hydrogen outlet valve and the hydrogen servo valve to replace nitrogen;
after the nitrogen is replaced by the hydrogen for one hour, manually closing a hydrogen outlet valve and a hydrogen servo valve;
and switching the circulating fan to an automatic control mode, operating the circulating fan at a high speed of 1700r/h, and cooling the hydrogen in the bell-type furnace.
6. The method for treating the high-temperature test mismatch of the bell-type furnace as recited in claim 1, wherein the ending treatment of the steel coil in the furnace comprises:
the furnace platform is purged in the later period by nitrogen, and hydrogen in the inner cover is removed;
cooling the furnace platform to a set tapping temperature value;
removing the cooling cover, loosening and removing the inner cover;
and (4) hanging the steel coil out of the bell-type furnace and transferring the steel coil to a specified area.
7. The method for treating the high-temperature test incompatibility of the bell type furnace as claimed in claim 1, wherein the hydrogen-replaceable condition of the furnace platform comprises: pressure fluctuation in the furnace is stable, and the positive and negative pressure does not exceed 3mbar; gas leakage rate less than 0.4m 3 /h。
8. A bell jar high temperature test non-conforming processing system, the processing system comprising:
a verification unit: the system is used for carrying out the preparation work of condition checking before treatment, and checking the hydrogen changeable condition of a furnace platform after carrying out emergency purging on the bell type furnace which is not tested at high temperature;
a first operation unit: for adjusting the preorder valve assembly;
a second operation unit: for starting the hydrogen exchange process;
an adjusting unit: process control management for performing a hydrogen change operation;
a third operation unit: used for ending the steel coil in the furnace.
9. The bell furnace high temperature test faulty treatment system according to claim 8, wherein the first operation unit comprises the following steps when in operation:
firstly, operating a relay to open a hydrogen inlet valve;
then operating the relay to open the hydrogen outlet valve;
then the nitrogen inlet valve was manually closed;
and finally, manually adjusting the circulating fan to enable the rotating speed of the circulating fan to be in a low-speed gear of 750 r/h.
10. The bell type furnace hot test non-conforming processing system according to claim 8, wherein the second operating unit comprises the following steps when in operation,
opening a hydrogen servo valve;
adjusting the opening of the hydrogen servo valve;
detecting whether the hydrogen flow rate passing through the hydrogen servo valve reaches 25m 3 H; the hydrogen flow reaches 25m 3 At the time of/h, the operation of the second operation unit is finished, and the hydrogen flow rate does not reach 25m 3 When the hydrogen flow reaches 25m, the opening of the hydrogen servo valve is continuously and repeatedly adjusted and detected until the hydrogen flow passing through the hydrogen servo valve reaches 25m 3 /h。
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