CN114182085A - Device and method for realizing low-temperature tempering function expansion of medium-high temperature heat treatment furnace - Google Patents
Device and method for realizing low-temperature tempering function expansion of medium-high temperature heat treatment furnace Download PDFInfo
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- CN114182085A CN114182085A CN202111505442.8A CN202111505442A CN114182085A CN 114182085 A CN114182085 A CN 114182085A CN 202111505442 A CN202111505442 A CN 202111505442A CN 114182085 A CN114182085 A CN 114182085A
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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
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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
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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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Abstract
A device and a method for realizing low-temperature tempering function expansion of a medium-high temperature heat treatment furnace relate to the technical field of metallurgy. The device and the method for realizing the low-temperature tempering function expansion of the medium-high temperature heat treatment furnace control the start of a heat-resistant circulating fan during the low-temperature tempering treatment, and nitrogen in the feeding end of the heat treatment furnace is pumped out through an air inlet pipe and then is introduced into the discharging end of the heat treatment furnace from an air outlet pipe so as to form protective nitrogen convection opposite to the advancing direction of a plate blank in the heat treatment furnace to carry out the low-temperature tempering treatment on the plate blank; and when the high-temperature tempering treatment is performed, the heat-resistant circulating fan is controlled to be closed and stopped, and partial nitrogen in the heat treatment furnace is discharged through the nitrogen pressure release valve so as to maintain the micro-positive pressure state in the furnace. The device and the method for realizing the low-temperature tempering function expansion of the medium-high temperature heat treatment furnace can shorten the heat treatment time of the plate blank in the heat treatment furnace in a low-temperature state, improve the uniformity and the yield of the furnace temperature at the low temperature of 252 ℃, and realize the seamless switching between the medium-high temperature tempering mode and the low-temperature tempering mode.
Description
Technical Field
The application relates to the technical field of metallurgy, in particular to a device and a method for realizing low-temperature tempering function expansion of a medium-high temperature heat treatment furnace.
Background
The medium temperature tempering is needed in the production process of the heat treatment process of the NM362 and other grade wear-resistant steels, the production of the NM452 and above high grade wear-resistant steels with high profit level needs to adopt a low temperature tempering process, the low temperature tempering temperature range is 152-252 ℃, and the low temperature tempering temperature function lower limit is expanded on the basis of keeping the high temperature heat treatment capability of the conventional medium-high temperature heat treatment furnace with the indirect heating type radiation pipes in consideration of the huge investment of a newly-built low temperature tempering heat treatment furnace, so that the low temperature tempering capability of 252 ℃ can effectively reduce the cost of purchasing equipment, and the economic benefit is very high.
The low-temperature tempering function expansion of the radiant tube indirect heating type heat treatment furnace is realized, and several schemes are available: 1. a low-temperature state waste heat utilization mode for recovering other furnace flue gas; 2. the furnace has a flue gas waste heat recovery mode; 3. the rear half-section radiant tube is modified to have a cold air blowing function by utilizing one of the existing radiant tube burner modification schemes, and the furnace temperature can be reduced to 352 ℃; 4. by utilizing the second modification scheme of the existing radiant tube burner, partial burners (about 12-18) in the last 3 sections of gas heating radiant tube burners are changed into electric heating radiant tubes, the first half section is still heated by the radiant tubes during production, the second half section is heated and insulated by the electric radiant tubes, and meanwhile, the furnace gas can be recycled, so that the effects of stirring the furnace gas and saving energy are achieved; 5. directly heating the furnace by adopting open flame burners, adopting small burners with stirring air, greatly modifying the furnace body and adding burners and a control system; 6. and (2) adopting an off-line combustion chamber mode, newly building a small combustion chamber beside the unit, mixing cold air or low-temperature flue gas into the combusted flue gas, uniformly mixing the flue gas to the required temperature (222-322 ℃), and pumping the mixed flue gas into the hearth by a circulating fan.
In the above transformation schemes, schemes 1 and 2 belong to a flue gas recovery waste heat utilization mode, wherein the scheme 1 utilizes flue gas of other heat treatment furnaces, the precondition is that the other heat treatment furnaces are required to normally produce, if monthly output is not full and only one furnace of the heat treatment furnace is required to produce, the scheme 1 is not feasible, and in addition, the smoke pipe of the scheme 1 is limited by the layout of a workshop, so that the difficulty is high; scheme 2 relates to furnace many places trompil, and the change is great, and the nozzle is not opened to the latter half, and furnace temperature control accuracy is difficult for guaranteeing under the low temperature state. Schemes 3 and 4 are both modified by using the existing radiant tube burner, wherein the lowest tempering temperature which can be ensured by the scheme 3 is 352 ℃, and a certain distance is reserved between the lowest tempering temperature and the target temperature of 252 ℃, the scheme 4 has large modification on part of the burner, the cost is high, but the idea of circularly using furnace gas to stir the interior of the hearth is worth reference. The proposal 5 has larger modification force on the burner and is limited by the narrow space of the hearth of the heat treatment furnace, and the proposal 6 has the highest modification cost among 6 modification proposals and is limited by the space of a workshop site.
In addition, in the 6 transformation schemes, the schemes 1, 2, 5 and 6 do not carry nitrogen protective atmosphere when being produced at low temperature, and the furnace is filled with flue gas for waste heat utilization or flue gas generated by burning of open flame burners or flue gas injected by an off-line combustion chamber, which is feasible at the low temperature of 252 ℃, because the temperature is low, the oxidation defect is not easily generated by heat treatment of the steel plate in the furnace. However, when the heat treatment furnace is used for medium-temperature and high-temperature tempering heat treatment production, the original heat treatment production mode with nitrogen protection is required to be switched, so that the whole furnace hearth gas is required to be replaced by the protective gas nitrogen, and the defects that the switching operation steps are complicated, the quick response is not easy when the yield task is full, the production is influenced and the like exist.
Disclosure of Invention
The application aims to provide a device and a method for realizing low-temperature tempering function expansion of a medium-high temperature heat treatment furnace, which can shorten the heat treatment time of a plate blank in the heat treatment furnace in a low-temperature state, improve the uniformity of the temperature of a hearth at the low temperature of 252 ℃ and the hourly output of high-grade wear-resistant steel, realize seamless switching of medium-high temperature tempering and low-temperature tempering in different operation modes, and have the advantages of low modification cost and convenient operation.
The embodiment of the application is realized as follows:
the embodiment of the application provides a device for realizing low-temperature tempering function extension of a medium-high temperature heat treatment furnace, which comprises a heat treatment furnace and a heat-resistant circulating fan, wherein an air inlet and an air outlet of the heat-resistant circulating fan are communicated with a newly-excavated hole at the top of a feeding end and a newly-excavated hole at the top of a discharging end of a hearth of the heat treatment furnace through an air inlet pipe and an air outlet pipe respectively.
In some optional embodiments, the air inlet pipe is provided with a first electromagnetic valve for communicating or cutting off the air inlet pipe.
In some optional embodiments, the air outlet pipe is provided with a second electromagnetic valve for communicating or cutting off the air outlet pipe.
In some alternative embodiments, the heat resistant recycle blower may be operated at a temperature of 252-352 ℃.
The application also provides a method for realizing the low-temperature tempering function expansion of the medium-high temperature heat treatment furnace, which is carried out by using the device for realizing the low-temperature tempering function expansion of the medium-high temperature heat treatment furnace, and comprises the following steps:
when low-temperature tempering treatment is carried out, a heat-resistant circulating fan is controlled to start, the heat-resistant circulating fan pumps out nitrogen in the feeding end of the heat treatment furnace through an air inlet pipe and then leads the nitrogen into the discharging end of the heat treatment furnace through an air outlet pipe, so that protective nitrogen convection opposite to the advancing direction of the plate blank is formed in the heat treatment furnace to carry out low-temperature tempering treatment on the plate blank;
and when the high-temperature tempering treatment is performed, the heat-resistant circulating fan is controlled to be closed and stopped, and partial nitrogen in the heat treatment furnace is discharged through the nitrogen pressure release valve so as to maintain the micro-positive pressure state in the furnace.
In some alternative embodiments, the pressure in the heat treatment furnace is controlled to be stable during the high-temperature tempering treatment and the low-temperature tempering treatment, when the pressure is too high, the redundant nitrogen is discharged through a nitrogen relief valve connected with the heat treatment furnace, and when the pressure is too low, nitrogen is introduced into the heat treatment furnace through a nitrogen conveying pipeline for pressurization so as to maintain the micro-positive pressure state of the protective atmosphere nitrogen in the furnace.
The beneficial effect of this application is: the application provides a device of high temperature heat treatment furnace low temperature tempering function extension in realization includes heat treatment furnace and heat-resisting circulating fan, and heat-resisting circulating fan's air inlet and gas outlet are respectively through intake pipe and outlet duct and heat treatment furnace's feeding one end top newly-excavated hole and ejection of compact one end top newly-excavated hole intercommunication. The application also provides a method for realizing the low-temperature tempering function expansion of the medium-high temperature heat treatment furnace, which comprises the following steps: when low-temperature tempering treatment is carried out, a heat-resistant circulating fan is controlled to start, the heat-resistant circulating fan pumps out nitrogen in the feeding end of the heat treatment furnace through an air inlet pipe and then leads the nitrogen into the discharging end of the heat treatment furnace through an air outlet pipe, so that protective nitrogen convection opposite to the advancing direction of the plate blank is formed in the heat treatment furnace to carry out low-temperature tempering treatment on the plate blank; and when the high-temperature tempering treatment is performed, the heat-resistant circulating fan is controlled to be closed and stopped, and partial nitrogen in the heat treatment furnace is discharged through the nitrogen pressure release valve so as to maintain the micro-positive pressure state in the furnace. The device and the method for realizing the low-temperature tempering function expansion of the medium-high temperature heat treatment furnace can shorten the heat treatment time of the plate blank in the heat treatment furnace in a low-temperature state, improve the uniformity of the temperature of the hearth at the low temperature of 252 ℃ and the hourly output of high-grade wear-resistant steel, realize the seamless switching of different operation modes of medium-high temperature tempering and low-temperature tempering, and have the advantages of low modification cost and convenient operation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of an apparatus for implementing low-temperature tempering function extension of a medium-high temperature heat treatment furnace according to an embodiment of the present application.
In the figure: 122. a heat treatment furnace; 112. a heat-resistant circulating fan; 122. an air inlet pipe; 132. an air outlet pipe; 142. a first solenoid valve; 152. a second solenoid valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The features and properties of the apparatus and method for expanding the low-temperature tempering function of a medium-high temperature heat treatment furnace according to the present application will be described in further detail with reference to the following examples.
As shown in fig. 1, an embodiment of the present application provides a device for implementing low temperature tempering function extension of a medium-high temperature heat treatment furnace, which includes a heat treatment furnace 122 and a heat-resistant circulating fan 112, an air inlet and an air outlet of the heat-resistant circulating fan 112 are respectively communicated with a newly-cut hole at the top of a feeding end and a newly-cut hole at the top of a discharging end of a hearth of the heat treatment furnace 122 through an air inlet pipe 122 and an air outlet pipe 132, the air inlet pipe 122 is provided with a first electromagnetic valve 142 for communicating or cutting off the air inlet pipe, the air outlet pipe 132 is provided with a second electromagnetic valve 152 for communicating or cutting off the air inlet pipe, and the heat-resistant circulating fan 112 can operate at a temperature of 252-; the heat treatment furnace 122 is provided with a nitrogen relief valve for discharging excess nitrogen gas inside.
The application also provides a method for realizing the low-temperature tempering function expansion of the medium-high temperature heat treatment furnace, which comprises the following steps: when low-temperature tempering treatment is carried out, the heat-resistant circulating fan 112 is controlled to be started, the first electromagnetic valve 142 on the air inlet pipe 122 is controlled to be communicated with the second electromagnetic valve 152 on the air outlet pipe 132, nitrogen in the feeding end of the heat treatment furnace 122 is pumped out by the heat-resistant circulating fan 112 through the air inlet pipe 122 and then is introduced into the discharging end of the heat treatment furnace 122 from the air outlet pipe 132, and protective nitrogen convection opposite to the advancing direction of the plate blank is formed in the heat treatment furnace 122, so that the convection heat exchange between the nitrogen protective gas in the heat treatment furnace 122 and the plate blank is enhanced, and the heat treatment heating time of the plate blank in the heat treatment furnace 122 is shortened;
when the high-temperature tempering treatment is performed, the heat-resistant circulating fan 112 is controlled to be closed, and the first electromagnetic valve 142 on the gas inlet pipe 122 and the second electromagnetic valve 152 on the gas outlet pipe 132 are controlled to be cut off, so that redundant nitrogen in the heat treatment furnace 122 is discharged through the nitrogen pressure relief valve to maintain the micro-positive pressure state in the heat treatment furnace 122; in this embodiment, the micro positive pressure state means that the pressure in the heat treatment furnace 122 is between 5 and 12 Pa.
Meanwhile, when the high-temperature tempering treatment and the low-temperature tempering treatment are carried out, the air pressure in the heat treatment furnace 122 is stable, when the air pressure is too high, redundant nitrogen is discharged through a nitrogen pressure release valve connected with the heat treatment furnace 122, when the air pressure is too low, nitrogen is introduced into the heat treatment furnace 122 through a nitrogen conveying pipeline for pressurization, and the purpose of maintaining the micro-positive pressure state of the protective atmosphere nitrogen in the furnace can be achieved.
In the method for realizing the low-temperature tempering function extension of the medium-high temperature heat treatment furnace provided by the embodiment, the heat-resistant circulating fan 112 is used for pumping out nitrogen at the feeding end at the front part of the hearth in the heat treatment furnace 122 and then introducing the pumped nitrogen into the discharging end at the rear part of the hearth of the heat treatment furnace 122, the nitrogen in the heat treatment furnace 122 is used as a furnace atmosphere disturbance air source to circulate, so that a nitrogen circulation closed-loop system is formed in the heat treatment furnace 122, the nitrogen in the furnace longitudinally penetrates through the whole hearth space and stirs the furnace atmosphere under the traction of the pumping force of the heat-resistant circulating fan 112, the convection heat exchange between the gas and the low-temperature tempering plate blank in the furnace is enhanced, the furnace heat treatment time of the plate blank in the furnace is shortened, and the aim of improving the hourly yield of high-grade wear-resistant steel produced by the heat treatment furnace is fulfilled. Protective gas nitrogen enters the hearth from the rear part of the hearth of the heat treatment furnace 122 to perform heat exchange with the plate blank in the furnace, then enters the front part of the hearth of the heat treatment furnace 122, then enters the hearth of the heat treatment furnace 122 from the rear part of the hearth through the suction pipe 132 by the heat-resistant circulating fan 112 through the air inlet pipe 122 to participate in the next heat exchange process in the furnace, and the heat-resistant circulating fan 112 can work at the temperature of 252-352 ℃, so that the damage to the fan caused by overhigh temperature of the nitrogen in the heat treatment furnace 122 is avoided. In the technical scheme of the application, the slab enters the furnace from the front part of the furnace chamber and is discharged from the rear part of the furnace chamber, so that the flow direction of gas in the furnace is reverse to the traveling direction of the slab in the furnace, and compared with a forward mode that the flow direction of gas is the same as the traveling direction of the slab in the furnace, the convection heat exchange between the gas in the furnace and the slab can be obviously enhanced, so that the heat treatment heating time of the slab in the furnace is shortened.
The first electromagnetic valve 142 and the second electromagnetic valve 152 are respectively arranged on the air inlet pipe 122 and the air outlet pipe 132, so that a user can conveniently cut off the air inlet pipe 122 and the air outlet pipe 132, the heat treatment furnace 122 is ensured to produce heat treatment steel varieties in a normal process at ordinary times, at the moment, the heat-resistant circulating fan 112 is turned off, and the air inlet pipe 122 and the air outlet pipe 132 are cut off, and the fan damage caused by the fact that high-temperature flue gas enters a pipeline of the heat-resistant circulating fan 112 is avoided; when NM452 and above high-grade wear-resistant steel is to be produced, the furnace temperature of the heat treatment furnace 122 is gradually reduced to 252 ℃, the heat load and the thermal inertia of a hearth are considered, the temperature reduction process is possibly longer, after the furnace temperature is reduced, the first electromagnetic valve 142 and the second electromagnetic valve 152 are controlled to be opened, the heat-resistant circulating fan 112 is controlled to be opened, nitrogen at the front part of the hearth of the heat treatment furnace 122 is pumped out and then is introduced to the rear part of the hearth of the heat treatment furnace 122, the flowing direction of the nitrogen in the furnace is opposite to the advancing direction of a heat treatment slab in the furnace, so that the flowing of the nitrogen in the furnace brings more convection heat exchange to the slab in the furnace as much as possible, and the low-temperature tempering heat treatment process of the slab in the furnace is accelerated; the user can discharge redundant nitrogen through the nitrogen relief valve connected with the heat treatment furnace 122, and avoid the damage to the heat treatment furnace 122 and the pipeline system caused by overlarge pressure.
The device and the method for realizing the low-temperature tempering function expansion of the medium-high temperature heat treatment furnace have the following advantages:
1. the heat treatment time of the plate blank in the heat treatment furnace 122 in the low-temperature state is shortened, and the hourly output of the high-grade wear-resistant steel is improved. Compared with the open flame type open-flame furnace, the open flame type open-flame furnace introduces the backflow flue gas to stir the atmosphere in the furnace, and only can stir a certain local transverse section of the hearth, the scheme of the application can integrally penetrate through the longitudinal section of the hearth of the whole heat treatment furnace 122, the stirring intensity is higher, the heat exchange effect is better at the low temperature of 252 ℃, and therefore the low-temperature tempering heat treatment production time of the plate blank in the heat treatment furnace 122 is greatly shortened. The heat transfer process numerical simulation calculation is carried out on the plate blank in the heat treatment furnace 122 in the scheme, and the calculation result shows that the scheme can shorten the time of the low-temperature tempered steel plate in the heat treatment furnace 122 from 182 minutes to 92 minutes, so that the low-temperature tempering capability of the indirect heating type heat treatment furnace with the nitrogen protection radiant tube can be greatly improved, and the large-scale industrial production requirement of the high-grade wear-resistant steel can be met.
2. And seamless switching between medium-high temperature tempering and low-temperature tempering in different operation modes is realized. This may be accomplished by a first solenoid valve 142 and a second solenoid valve 152. When low-temperature tempering heat treatment at 252 ℃ needs to be carried out on a steel plate in the furnace, the first electromagnetic valve 142 and the second electromagnetic valve 152 are opened, and the heat-resistant circulating fan 112 is started, so that longitudinal penetration disturbance of protective gas nitrogen in the furnace to the whole hearth can be realized; when the medium-high temperature tempering heat treatment is required to be carried out on the steel plate in the furnace, the heat-resistant circulating fan 112 outside the hearth, the first electromagnetic valve 142 and the second electromagnetic valve 152 are closed, and then the production can be organized according to the original production mode.
3. The temperature uniformity of the hearth at the low temperature of 252 ℃ is improved. Under original medium and high temperature production mode, protective atmosphere nitrogen gas velocity in the heat treatment furnace 122 is extremely low, presents an approximate static natural convection state, and under low temperature production mode, through protective atmosphere nitrogen gas vertically run through the whole heat treatment furnace 122's furnace under heat-resisting circulating fan 112 drives, can promote the interior atmosphere of stove in the heat treatment furnace 122 furnace inside orderly, the regular flow, easily eliminate local super warm spot and temperature fluctuation point to further improve the furnace temperature homogeneity under the 252 ℃ low temperature.
4. The reconstruction cost is low. According to the scheme, only the heat-resistant circulating fan 112 and the matched pipeline and valve system thereof are needed to be added, the structure of the furnace body and the burner nozzle are not needed to be changed, besides a hole is dug in the furnace top of the front and rear parts of the furnace body of the heat treatment furnace 122, other holes do not need to be dug in other parts of the furnace wall, and therefore the lowest reconstruction cost can be achieved in all reconstruction schemes, and the control can be within 32 ten thousand yuan.
The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
Claims (6)
1. The device for realizing the low-temperature tempering function expansion of the medium-high temperature heat treatment furnace is characterized by comprising the heat treatment furnace and a heat-resistant circulating fan, wherein an air inlet and an air outlet of the heat-resistant circulating fan are respectively communicated with a newly-cut hole at the top of a feeding end and a newly-cut hole at the top of a discharging end of a hearth of the heat treatment furnace through an air inlet pipe and an air outlet pipe.
2. The device for realizing the low-temperature tempering function expansion of the medium-high temperature heat treatment furnace according to claim 1, wherein a first electromagnetic valve for communicating or cutting off the air inlet pipe is arranged on the air inlet pipe.
3. The device for realizing the low-temperature tempering function expansion of the medium-high temperature heat treatment furnace according to claim 1, wherein a second electromagnetic valve for communicating or cutting off the gas outlet pipe is arranged on the gas outlet pipe.
4. The device for realizing the low-temperature tempering function expansion of the medium-high temperature heat treatment furnace as claimed in claim 1, wherein the heat-resistant circulating fan can operate at the temperature of 252-352 ℃.
5. A method for realizing the low-temperature tempering function expansion of a medium-high temperature heat treatment furnace, which is carried out by using the device for realizing the low-temperature tempering function expansion of the medium-high temperature heat treatment furnace according to claim 1, and comprises the following steps:
when low-temperature tempering treatment is carried out, controlling a heat-resistant circulating fan to start, wherein the heat-resistant circulating fan pumps out nitrogen in the feeding end of the heat treatment furnace through an air inlet pipe and then leads the nitrogen into the discharging end of the heat treatment furnace through an air outlet pipe so as to form protective nitrogen convection opposite to the advancing direction of the plate blank in the heat treatment furnace and carry out low-temperature tempering treatment on the plate blank;
and when the high-temperature tempering treatment is performed, the heat-resistant circulating fan is controlled to be closed and stopped, and partial nitrogen in the heat treatment furnace is discharged through the nitrogen pressure release valve so as to maintain the micro-positive pressure state in the furnace.
6. The method for realizing the low-temperature tempering functional expansion of the medium-high temperature heat treatment furnace according to claim 5, wherein during the medium-high temperature tempering treatment and the low-temperature tempering treatment, the air pressure in the heat treatment furnace is controlled to be stable, when the air pressure is too high, redundant nitrogen is discharged through a nitrogen pressure relief valve connected with the heat treatment furnace, and when the air pressure is too low, nitrogen is introduced into the heat treatment furnace through a nitrogen conveying pipeline for pressurization so as to maintain the micro-positive pressure state of protective atmosphere nitrogen in the furnace.
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| CN109929970A (en) * | 2019-04-28 | 2019-06-25 | 东北大学 | Low-temp temper furnace and low temperature control method in a kind of smoke gas circulating type steel plate |
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| CN212051562U (en) * | 2020-03-27 | 2020-12-01 | 重庆赛迪热工环保工程技术有限公司 | Medium-low temperature heat treatment furnace |
| CN112029972A (en) * | 2020-09-23 | 2020-12-04 | 重庆赛迪热工环保工程技术有限公司 | Method and system for improving low-temperature non-oxidation heat treatment of radiant tube type roller hearth furnace |
| CN112662857A (en) * | 2020-11-25 | 2021-04-16 | 华北电力大学 | Atmosphere heat treatment furnace for improving material cooling rate |
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