CN116536486A - Energy-saving hood-type annealing furnace system and use method thereof - Google Patents
Energy-saving hood-type annealing furnace system and use method thereof Download PDFInfo
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- CN116536486A CN116536486A CN202310516787.6A CN202310516787A CN116536486A CN 116536486 A CN116536486 A CN 116536486A CN 202310516787 A CN202310516787 A CN 202310516787A CN 116536486 A CN116536486 A CN 116536486A
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- 238000000137 annealing Methods 0.000 title claims abstract description 163
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 77
- 238000001816 cooling Methods 0.000 claims abstract description 70
- 230000001681 protective effect Effects 0.000 claims abstract description 64
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 44
- 230000008569 process Effects 0.000 claims description 23
- 238000001035 drying Methods 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 52
- 229910000831 Steel Inorganic materials 0.000 description 37
- 239000010959 steel Substances 0.000 description 37
- 239000001257 hydrogen Substances 0.000 description 14
- 229910052739 hydrogen Inorganic materials 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000000746 purification Methods 0.000 description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 10
- 239000000428 dust Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000006872 improvement Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004108 freeze drying Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
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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
- C21D1/26—Methods of annealing
-
- 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
- C21D1/76—Adjusting the composition of the atmosphere
-
- 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
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
-
- 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
- C21D9/667—Multi-station furnaces
- C21D9/67—Multi-station furnaces adapted for treating the charge in vacuum or special atmosphere
-
- 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
- C21D9/673—Details, accessories, or equipment peculiar to bell-type furnaces
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses an energy-saving hood-type annealing furnace system and a use method thereof, wherein the energy-saving hood-type annealing furnace system comprises at least two hood-type annealing furnaces, each hood-type annealing furnace comprises an annealing furnace table, a circulating fan, an inner hood and an outer hood, the outer hood is a heating hood or a cooling hood, the top end of the annealing furnace table is provided with the inner hood and the outer hood in a sealing manner, the inner space of the inner hood is a furnace chamber, the furnace chamber is filled with protective atmosphere, the inside of the annealing furnace table is provided with the circulating fan, the air inlet end of the circulating fan is respectively communicated with the corresponding furnace chamber, the air outlet end of the circulating fan is connected with a two-position three-way valve, two ends of the two-position three-way valve are respectively connected with an inner circulating pipeline and an outer circulating pipeline, the two ends are respectively corresponding to a furnace inner circulating state and a furnace circulating state through valve switching, and the gas in the furnace chamber can be returned to the furnace chamber of the annealing furnace or is sent to the furnace chamber of another hood-type annealing furnace. The gas circulation exchange and heat transmission between the furnace platforms are carried out by using the fan in the furnace platforms, so that the secondary utilization of heat is realized, and the operation is simple and feasible, energy is saved, and the environment is protected.
Description
Technical Field
The invention relates to the technical field of steel coil heat treatment, in particular to an energy-saving hood-type annealing furnace system and a use method thereof.
Background
The iron and steel industry is an important basic industry of national economy and has the characteristic of dense energy. The steel yield in China is the first world for many years, but the comprehensive energy consumption of the steel industry is different from the international advanced level, wherein the sintering, blast furnace and steelmaking processes have considerable heat which cannot be recycled. With the deep promotion of energy conservation and emission reduction in China, the steel industry is faced with increasingly huge structure adjustment and energy consumption reduction repulsion.
The cold-rolled strip steel product is widely applied to industries such as automobiles, household appliances, buildings, machinery manufacturing and the like by virtue of excellent structure and processability. At present, the production process of cold-rolled strip steel products generally takes hot-rolled products as raw materials, and the products are manufactured through three procedures of pickling, cold rolling and annealing, wherein batch annealing of steel coils is completed by using hood-type annealing furnace equipment in the annealing process.
The hood annealing of the coil of steel is performed as follows: and stacking the steel coils which need annealing heat treatment, and putting the steel coils into a hood-type annealing furnace for heating and cooling to realize the heat treatment process of annealing the steel coils. The whole set of hood-type annealing furnace equipment comprises a furnace table, an inner hood, a heating hood, a cooling hood and the like. In order to fully utilize equipment and improve effective production time, the hood-type annealing furnace is generally formed by at least two furnace platforms in a group in a furnace group mode, one furnace platform heats the steel coil and the other furnace platform cools the steel coil, so that the utilization rate of the equipment can be effectively improved.
The existing steel coil hood-type annealing furnace is characterized in that a heating hood is the only source of heat, and an electric or gas heating mode is generally used, and because steel coils are subjected to heat treatment in a protective atmosphere, the heat generated by the heating hood does not directly heat the steel coils, but firstly heats an inner hood, and the steel coils placed in the inner hood transfer the heat of the inner hood to the steel coils through the convection heat exchange of the protective atmosphere in the inner hood under the action of a fan in a furnace platform. After the heating process is finished, firstly, cooling the heating cover for a period of time, at the moment, stopping heating by a heat source of the heating cover, naturally radiating heat of a steel coil in the furnace through equipment, and slowly cooling; after the interior of the inner cover is cooled to a certain temperature, the heating cover is usually taken out below 600 ℃, the cooling cover is replaced for cooling, the cooling cover has two cooling modes at the same time, air cooling is adopted in the high-temperature stage of cooling, and air at normal temperature is sucked by a blower, blown to the inner cover, and hot air is discharged through a smoke exhaust pipeline after heat is taken away; spraying water cooling is adopted in the low-temperature stage of cooling, circulating cooling water is sprayed on the surface of the inner cover from the top of the cooling cover, and after heat of the inner cover is taken away, the circulating cooling water flows back to the cooling tower for heat dissipation; in the whole cooling process, the circulating fan in the furnace continuously works to continuously transfer the heat of the steel coil to the inner cover with lower temperature, so that the cooling of the steel coil is realized.
The existing hood-type annealing furnace has very low utilization rate of heat, from the point of view of thermal cycle, all the input heat is discharged into the air in the cooling process, the thermal efficiency of the whole system can be regarded as zero, and the mode is not suitable for the requirements of people on low carbon and high energy efficiency in industrial production under the 'double carbon' background.
Disclosure of Invention
In order to solve the problems in the background technology, the invention provides an energy-saving hood-type annealing furnace system, which utilizes a fan in a furnace table to perform gas circulation exchange between the furnace tables to realize heat transmission between the furnace tables, and can recycle at least 30% of heat in the heating process, namely reduce 30% of heat input, so that the equipment investment is not increased greatly, the operation is simple and easy, and the energy-saving and environment-friendly effects are good. In addition, the invention also provides a use method of the energy-saving hood-type annealing furnace system.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
according to a first aspect of the invention, an energy-saving hood-type annealing furnace system is provided, the energy-saving hood-type annealing furnace system comprises at least two hood-type annealing furnaces, each hood-type annealing furnace comprises an annealing furnace table, a circulating fan, an inner hood and an outer hood, the outer hood is a heating hood or a cooling hood, the inner hood and the outer hood are arranged at the top end of the annealing furnace table in a sealing mode, the outer hood is arranged outside the inner hood, the inner hood inner space is a furnace chamber, the furnace chamber is filled with a protective atmosphere, the circulating fan is arranged in the annealing furnace table, the air inlet end of the circulating fan is respectively communicated with the corresponding furnace chamber, the air outlet end of the circulating fan is communicated with a two-position three-way valve, two ends of the two-position three-way valve are respectively connected with an inner circulating pipeline and an outer circulating pipeline, the two-position three-way valve is respectively communicated with the corresponding furnace chamber through the inner circulating pipeline to realize gas circulation inside the furnace table and the corresponding hood-type annealing furnace when the annealing furnace is in the furnace circulation state, and the annealing furnace is communicated with the corresponding hood-type furnace chamber when the annealing furnace is in the furnace circulation state.
A further improvement is that the pipe diameters of the inner circulation pipe and the outer circulation pipe are larger than DN250.
The pipe diameter of the gas circulation pipe needs to have a sufficient outer diameter to ensure that the pipe resistance does not affect the gas circulation, and is usually larger than DN250, preferably DN400.
The external circulation pipeline is composed of a first external circulation pipeline and a second external circulation pipeline, a thermocouple for detecting the temperature of internal gas is arranged in the external circulation pipeline, a bypass pipeline is arranged on the external circulation pipeline, a control valve is arranged on the bypass pipeline, the end part of the bypass pipeline is connected with a gas purifying device for filtering, purifying and drying protective atmosphere, and the protective atmosphere enters the external circulation pipeline again through the bypass pipeline after being purified and dried.
And at the initial stage of entering the inter-furnace circulation state, a control valve on a bypass pipeline is opened, the gas purification device pumps the protective atmosphere in the outer circulation pipeline for drying and purifying treatment, and the dry protective gas with water vapor and dust removed is conveyed back to the outer circulation pipeline, so that the cyclic utilization of the protective atmosphere is realized. The reason why the gas purification device is started at the initial stage of the inter-hearth circulation is that the temperature of the steel coil in the hearth to be heated is close to the room temperature at this time, and the temperature of the protective atmosphere is the lowest after the hot protective gas transfers heat to the room temperature steel coil, so that the drying and purification of the protective atmosphere can be realized with the least energy loss. Specifically, the gas purifying device comprises a dust removing and purifying device (such as cyclone dust removing, filter screen dust removing and the like), and a moisture drying device (such as a water molecule sieve or freeze drying).
A further improvement consists in that the protective atmosphere in the furnace chamber of the low-temperature annealing furnace table is completely replaced before entering the inter-furnace circulation state.
Further, the improvement is that the protective atmosphere can be fully utilized by the gas circulation between the furnace floors, but in order to prevent oxidation due to the increase of dew point caused by the long-term use of the protective atmosphere in the furnace and to maintain the positive pressure of the atmosphere in the furnace necessary for stable production, a small amount of fresh protective gas needs to be introduced into the protective gas every a while during the furnace floor circulation.
The external circulation pipeline is a high-temperature-resistant stainless steel pipeline, and the external side of the external circulation pipeline is coated with a heat-insulating material layer.
A further improvement is that the housing is a heating housing or a cooling housing.
Specifically, each hood-type annealing furnace is simultaneously provided with a heating hood and a cooling hood, and when the hood-type annealing furnace needs to enter a heating process, the heating hood is sealed and mounted to the top end of the annealing furnace table, and when the hood-type annealing furnace needs to enter a cooling process, the cooling hood is replaced at the moment, and the cooling hood is sealed and mounted to the top end of the annealing furnace table.
The heating cover is characterized in that a heating device is arranged in the heating cover, and a heat preservation material layer is arranged on the inner side wall of the heating cover.
Specifically, the heating device adopts a gas burner or a resistance wire heating mode to generate heat.
The further improvement is that the cooling cover is internally provided with an air cooling device and a water cooling device.
Specifically, in the high temperature stage of the cooling process, an air cooling device is adopted to blow the air to the inner cover, and hot air is discharged after heat is taken away; and in the low-temperature stage of the cooling process, the inner cover is cooled by adopting spray water in a water cooling device, circulating cooling water is sprayed on the surface of the inner cover from the top of the cooling cover, and heat of the inner cover is taken away and then flows back to the cooling tower for heat dissipation.
The further improvement is that the protective atmosphere filled in the furnace chamber is pure hydrogen or nitrogen-hydrogen mixed gas, and the volume content of hydrogen in the nitrogen-hydrogen mixed gas is more than or equal to 70 percent.
Specifically, because the heat exchange efficiency of the hydrogen is higher, pure hydrogen is preferably used as the protective atmosphere filled in the furnace chamber, and when the hydrogen-nitrogen mixer is selected, the hydrogen content is required to be controlled to be more than or equal to 70 percent in order to ensure the heat exchange efficiency.
The second aspect of the invention provides a use method of the energy-saving hood-type annealing furnace system, which comprises the following specific use steps:
s1, placing a material to be treated on an annealing furnace table of a first hood-type annealing furnace, covering an inner hood to isolate internal atmosphere from external atmosphere, then buckling a heating hood on the outer side of the inner hood, switching a two-position three-way valve to a furnace internal circulation state, starting replacement of protective atmosphere in a furnace chamber, enabling the first hood-type annealing furnace to enter a heating procedure, generating heat by the heating hood to heat the inner hood, transmitting temperature to the interior of the furnace chamber by the inner hood, switching the two-position three-way valve, enabling the first hood-type annealing furnace to be in the furnace internal circulation state, starting a circulating fan in the first hood-type annealing furnace, enabling the protective atmosphere in the furnace chamber to circulate, transmitting the heat to the material to be treated, and continuously increasing the temperature of the material;
s2, after the temperature of the material reaches the preset temperature and the heat preservation is carried out for enough time to finish annealing, starting to enter a cooling process, simultaneously, placing another material to be treated on an annealing furnace table of an adjacent second hood-type annealing furnace, covering an inner hood to isolate the internal atmosphere from the external atmosphere, then buckling a heating hood on the outer side of the inner hood, replacing the protective atmosphere in the furnace chamber, and entering a preheating process by the second hood-type annealing furnace;
s3, simultaneously switching two three-way valves of the two hood-type annealing furnaces to enable the two three-way valves to be in an inter-furnace circulation state, conveying high-temperature protective atmosphere in the first hood-type annealing furnace to the second hood-type annealing furnace for heating materials to be treated in the first hood-type annealing furnace, conveying low-temperature protective atmosphere in the second hood-type annealing furnace to the first hood-type annealing furnace for cooling the materials annealed in the first hood-type annealing furnace, opening a control valve on a bypass pipeline at the initial stage of the inter-furnace circulation state, and enabling the protective atmosphere to enter the gas purification device for dust removal and water removal purification;
s4, when the internal temperatures of the two hood-type annealing furnaces are close, specifically, when the temperature difference of protective atmosphere in the external circulation pipelines of the two annealing furnaces is less than 100 ℃, switching the two three-way valves to be in a furnace circulation state, and independently operating the two hood-type annealing furnaces, taking down the heating hood of the first hood-type annealing furnace, fastening the cooling hood, finally cooling the internal materials, and simultaneously igniting and heating the heating hood of the second hood-type annealing furnace to heat the internal materials to a target temperature;
s5, after the cooling of the materials in the first hood-type annealing furnace is finished, discharging the materials and charging the new materials, covering the inner hood to isolate the internal atmosphere from the external atmosphere, buckling the heating hood on the outer side of the inner hood, and replacing the internal protective atmosphere.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the two-position three-way valve is communicated with the air outlet end of the circulating fan, the two ends of the two-position three-way valve are respectively connected with the inner circulating pipeline and the outer circulating pipeline, when the furnace is used, the gas in the furnace chamber can be returned to the furnace chamber of the furnace or is sent to the furnace chamber of the adjacent cover-type annealing furnace through the switching of the valves, the heat exchange between the furnace platforms is realized through the circulation of the protective atmosphere between the adjacent cover-type annealing furnaces, the heat released by the material in the cooling process is fully utilized to heat the material in the adjacent cover-type annealing furnaces, thereby realizing the secondary utilization of the heat, and at least 30% of the heat in the heating process can be recycled through the actual production use accounting, namely, 30% of heat input is reduced, the equipment investment is increased little, and only the connection of the gas circulating pipeline is additionally required, the operation is simple, the energy conservation and the environmental protection effect is good; in addition, each batch of the traditional hood-type annealing process needs to be filled with new shielding gas, and all the shielding gas is discharged outside the furnace when the production is finished.
Drawings
The invention will be described in further detail with reference to the drawings and the specific embodiments.
FIG. 1 is a schematic view of an energy-saving hood-type annealing furnace system in an inter-furnace circulation state;
FIG. 2 is a schematic view of the structure of the energy-saving hood-type annealing furnace system in the circulating state in the furnace;
wherein, the specific reference numerals are as follows: 1. the material to be treated comprises 2 parts of bypass pipeline, 3 parts of annealing furnace table, 4 parts of heating cover, 5 parts of cooling cover, 6 parts of inner cover, 7 parts of furnace chamber, 8 parts of circulating fan, 9 parts of two-position three-way valve, 10 parts of inner circulating pipeline, 11 parts of outer circulating pipeline.
Detailed Description
The embodiment of the invention discloses an energy-saving hood-type annealing furnace system, which comprises at least two hood-type annealing furnaces as shown in fig. 1 and 2, and in the embodiment, the system comprises two hood-type annealing furnaces, each hood-type annealing furnace comprises an annealing furnace table 3, a circulating fan 8, an inner hood 6 and an outer hood, wherein the top end of the annealing furnace table 3 is used for placing a material 1-steel coil to be treated, other metal materials such as aluminum, copper, titanium, stainless steel and the like and alloys thereof can be placed on the top end of the annealing furnace table 3, the steel coil is vertically placed on the top end of the annealing furnace table 3, the top end of the annealing furnace table 3 is provided with the inner hood 6 and the outer hood in a sealing way, the outer hood is positioned on the outer side of the inner hood 6, the outer hood is a heating hood 4 or a cooling hood 5 and can be replaced according to the use requirement, the inner space of the inner hood 6 is a furnace chamber 7, the furnace chamber 7 is filled with a protective atmosphere, the inside of the annealing furnace table 3 is provided with the circulating fan 8, the air inlet end of the circulating fan 8 is respectively communicated with the corresponding furnace chamber 7, specifically, the air inlet end of the circulating fan 8 is communicated with the space of the inner cavity of the vertically placed steel coil, the effect of quickly and uniformly heating or radiating the steel coil is realized, the air outlet end of the circulating fan 8 is communicated with a two-position three-way valve 9, two ends of the two-position three-way valve 9 are respectively connected with an inner circulating pipeline 10 and an outer circulating pipeline 11, when the circulating fan is in operation, the two-position three-way valve 9 is correspondingly in an inner circulating state and an inter-furnace circulating state respectively through switching, when the circulating fan is in the inner circulating state, the circulating fan 8 is used for returning the gas in the furnace cavity 7 to the furnace cavity 7 through the inner circulating pipeline 10, the gas circulation in the furnace cavity 7 is realized, when the circulating fan is in the inter-furnace circulating state, the gas in the furnace cavity 7 is sent to the furnace cavity 7 of the adjacent other cover-type annealing furnace through the outer circulating pipeline 11, the gas circulation between the furnace cavities is realized, the heat exchange between the furnace platforms is realized through the protection atmosphere circulation between the adjacent hood-type annealing furnaces, the heat released by the materials in the cooling process is fully utilized to heat the materials in the hood-type annealing furnaces adjacent to the heat, so that the secondary utilization of the heat is realized, at least 30% of the heat in the heating process can be recycled through the actual production use accounting, namely, 30% of the heat input is reduced, the equipment investment is not greatly increased, only the gas circulation pipeline connection is additionally required, the operation is simple and easy, and the energy-saving and environment-friendly effects are good.
Wherein the pipe diameters of the inner circulation pipeline 10 and the outer circulation pipeline 11 are larger than DN250. The pipe diameter of the gas circulation pipe needs to have a sufficient outer diameter size to ensure that the pipe resistance does not affect the gas circulation, and is usually larger than DN250, preferably the pipe diameter size is DN400.
Wherein, outer circulation pipeline 11 comprises first outer circulation pipeline and second outer circulation pipeline, installs the thermocouple that is used for detecting inside gas temperature in the outer circulation pipeline 11, and is equipped with bypass line 2 on the outer circulation pipeline 11, installs control valve on the bypass line 2, and its tip installs the gas purification device who is used for carrying out filtration purification and drying treatment to the protective atmosphere. At the initial stage of entering the inter-furnace circulation state, a control valve on the bypass pipeline 2 is opened, the gas purifying device extracts part of protective atmosphere in the outer circulation pipeline 11 for drying and purifying treatment, and the dry protective gas with water vapor and dust removed is conveyed back to the outer circulation pipeline 11, so that the cyclic utilization of the protective atmosphere is realized. The reason why the gas purification device is started at the initial stage of the inter-hearth circulation is that the temperature of the steel coil in the hearth to be heated is close to the room temperature at this time, and the temperature of the protective atmosphere is the lowest after the hot protective gas transfers heat to the room temperature steel coil, so that the drying and purification of the protective atmosphere can be realized with the least energy loss. Specifically, the gas purifying device comprises a dust removing and purifying device (such as cyclone dust removing, filter screen dust removing and the like), and a moisture drying device (such as a water molecule sieve or freeze drying).
Wherein the protective atmosphere in the furnace chamber of the low-temperature annealing furnace table 3 is completely replaced before entering the inter-furnace circulation state. The protective atmosphere can be fully utilized by gas circulation between the furnace floors, but in order to prevent oxidation due to increase of dew point and maintenance of positive pressure of the furnace atmosphere necessary for stable production due to long-term use of the protective atmosphere in the furnace, a small amount of fresh protective gas needs to be introduced into the protective gas every a while during the gas circulation in the furnace floors.
Wherein, the outer circulation pipeline 11 is a high temperature resistant stainless steel pipeline, and the outside of the outer circulation pipeline is coated with a heat preservation material layer.
Wherein the outer cover is a heating cover 4 or a cooling cover 5. Specifically, each hood-type annealing furnace is simultaneously provided with a heating hood 4 and a cooling hood 5, and when the hood-type annealing furnace needs to enter a heating process, the heating hood 4 is sealed and mounted to the top end of the annealing furnace table 3, and when the hood-type annealing furnace needs to enter a cooling process, the cooling hood 5 is replaced at this time and is sealed and mounted to the top end of the annealing furnace table 3.
Wherein, heating device is installed to heating mantle 4 internally mounted, and heating mantle 4 inside wall is equipped with the heat preservation material layer. Specifically, the heating device adopts a gas burner or a resistance wire heating mode to generate heat.
Wherein, the cooling cover 5 is internally provided with an air cooling device and a water cooling device. Specifically, in the high temperature stage of the cooling process, an air cooling device is adopted to blow the air to the inner cover 6, and hot air is discharged after heat is taken away; at the low temperature stage of the cooling process, the inner cover 6 is cooled by adopting spray water in a water cooling device, circulating cooling water is sprayed on the surface of the inner cover 6 from the top of the cooling cover 5, and heat of the inner cover 6 is taken away and then flows back to the cooling tower for heat dissipation.
Wherein, the protective atmosphere filled in the furnace chamber 7 is pure hydrogen or nitrogen-hydrogen mixed gas, and the volume content of hydrogen in the nitrogen-hydrogen mixed gas is more than or equal to 70 percent. Because the heat exchange efficiency of the hydrogen is higher, pure hydrogen is preferably adopted as the protective atmosphere filled in the furnace chamber 7, and when the hydrogen-nitrogen mixed gas is selected, the hydrogen content is required to be controlled to be more than or equal to 70 percent in order to ensure the heat exchange efficiency.
The using method of the energy-saving hood-type annealing furnace system comprises the following specific using steps:
s1, placing a material 1 to be treated on an annealing furnace table 3 of a first hood-type annealing furnace, covering an inner hood 6 for internal and external atmosphere isolation, then buckling a heating hood 4 on the outer side of the inner hood 6, switching a two-position three-way valve 9 to a furnace internal circulation state, replacing the protective atmosphere in a furnace chamber 7, adjusting the outer hood to a heating mode, enabling the first hood-type annealing furnace to enter a heating procedure, generating heat by the outer hood to heat the inner hood 6, transmitting the temperature to the furnace chamber 7 by the inner hood 6, switching the two-position three-way valve 9, enabling the first hood-type annealing furnace to be in the furnace internal circulation state, starting a circulating fan 8 in the first hood-type annealing furnace, circularly flowing the protective atmosphere in the furnace chamber 7, and continuously increasing the temperature of the material to be treated;
s2, after the temperature of the material reaches the preset temperature and the heat preservation is carried out for enough time to finish annealing, starting to enter a cooling process, placing another material 1 to be treated on an annealing furnace table 3 of an adjacent second hood-type annealing furnace, covering an inner hood 6 to isolate the internal atmosphere from the external atmosphere, then buckling a heating hood 4 on the outer side of the inner hood 6, replacing the protective atmosphere in a furnace chamber 7, and entering the heating process;
s3, simultaneously switching two three-way valves 9 of the two hood-type annealing furnaces to enable the two hood-type annealing furnaces to be in an inter-furnace circulation state, conveying high-temperature protective atmosphere in the first hood-type annealing furnace to the second hood-type annealing furnace for heating the material 1 to be treated, conveying low-temperature protective atmosphere in the second hood-type annealing furnace to the first hood-type annealing furnace for cooling the material annealed in the first hood-type annealing furnace, opening a control valve on a bypass pipeline 2 at the initial stage of the inter-furnace circulation state, and enabling the protective atmosphere to enter into a gas purification device for dust removal and water removal purification;
s4, when the internal temperatures of the two hood-type annealing furnaces are close, specifically, when the temperature difference of protective atmosphere in the external circulation pipelines of the two annealing furnaces is less than 100 ℃, the two three-way valves 9 are switched to be in a furnace circulation state, the two hood-type annealing furnaces independently operate, at the moment, the heating hood of the first hood-type annealing furnace is taken down, the cooling hood is buckled, the internal materials are finally cooled, and meanwhile, the second hood-type annealing furnace is adjusted to be in a heating mode, and the internal materials are heated to the target temperature;
s5, after the cooling of the materials in the first hood-type annealing furnace is finished, discharging the materials and charging the new materials, covering the inner hood 6 for internal and external atmosphere isolation, then buckling the heating hood 4 on the outer side of the inner hood 6, and replacing the internal protective atmosphere, wherein the second hood-type annealing furnace enters a cooling stage, the two-position three-way valve 9 is switched to be in an inter-furnace circulation state, the first hood-type annealing furnace enters a heating process, a new circulation is started, and the reciprocating alternation is performed.
Specific application example:
the energy-saving hood-type annealing furnace system in the embodiment is used for the heat treatment process of the steel coil, and the specific process requirements are as follows: the steel coil is heated to 700 ℃ from room temperature, kept for 16 hours and then cooled, wherein the initial heating heat sources of the rest hood-type annealing furnaces are inter-furnace heat exchange when the system is operated except that one hood-type annealing furnace needs to be heated by the heating hood 4 for the first time.
Assuming that the furnace platform of the first hood-type annealing furnace is already insulated and cooled, the furnace platform of the second hood-type annealing furnace is already filled with steel coils, the heating hood 4 is already ready and is already filled with protective gas, the two-position three-way valve 9 is switched, the furnace platform enters an inter-furnace circulation state, heat exchange between the furnace platforms is started, the control valve on the bypass pipeline 2 is opened, the protective gas is purified, when the temperature of the gas in the circulation pipeline is higher than 120 ℃, the valve is closed, gas purification is stopped, the inter-furnace heat exchange can be used for raising the temperature of the steel coils in the furnace platform of the second hood-type annealing furnace from room temperature to 300 ℃, and simultaneously, the temperature of the steel coils needing to be cooled in the first hood-type annealing furnace is lowered from 700 ℃ to 400 ℃, the process takes 6 hours, the two-position three-way valve 9 is switched to be in the intra-furnace circulation state, the two hood-type annealing furnace platforms are independently operated, the furnace platform of the first hood-type annealing furnace is replaced with the cooling hood 5 to be cooled, the furnace is discharged after 20 hours of cooling, the steel coils are discharged from the furnace after 2 hours, the furnace discharging and new charging of the steel coils are completed, and the replacement of the protective gas is completed after 2 hours. The furnace platform of the second hood-type annealing furnace is heated from 300 ℃ to 700 ℃ in 8 hours at the same time, and after heat preservation for 16 hours, the furnace platform is ready to enter a cooling stage, and at the moment, the two-position three-way valve 9 can be switched into a furnace-to-furnace circulation state to start a new circulation. The circulation can realize the seamless connection of the two hood-type annealing furnaces, and the equipment utilization rate is highest. This process is suitable for heat treatment processes with heating cycles close to cooling cycles, which would otherwise affect the equipment utilization.
In summary, the invention provides an energy-saving hood-type annealing furnace system and a use method thereof, which utilize a fan in a furnace table to carry out gas circulation exchange among the furnace tables, realize heat transmission among the furnace tables, and can recycle at least 30% of heat in the heating process, namely reduce 30% of heat input, so that the equipment investment is not greatly increased, the operation is simple and easy, and the energy-saving and environment-friendly effects are good.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.
Claims (5)
1. The utility model provides an energy-saving hood-type annealing furnace system, its characterized in that includes two at least hood-type annealing furnace, every the hood-type annealing furnace includes annealing stove top, circulating fan, inner cover and dustcoat, the dustcoat is heating cover or cooling cover, annealing stove top sealing mounting the inner cover with the dustcoat, the dustcoat is located the inner cover outside, inner cover inner space is the furnace chamber, the furnace chamber is inside to be filled with the protective atmosphere, annealing stove top internally mounted has circulating fan, circulating fan's air inlet end is linked together with corresponding furnace chamber respectively, circulating fan's air outlet end intercommunication is equipped with two tee bend valves, two tee bend valves's both ends are connected with internal circulation pipeline and outer circulation pipeline respectively, correspond through the switching of valve and be stove internal circulation state and interfurnace circulation state, when being in stove internal circulation state, through internal circulation pipeline and corresponding the furnace chamber of hood-type annealing furnace is linked together and is realized through the interfurnace circulation state of interfurnace chamber, when being in annealing stove, is linked together through external circulation pipeline and adjacent through the interfurnace chamber gas circulation of hood-type.
2. The energy efficient hood-type annealing furnace system according to claim 1, wherein the pipe diameters of the inner circulation pipe and the outer circulation pipe are larger than DN250.
3. The energy-saving hood-type annealing furnace system according to claim 1, wherein a thermocouple for detecting the temperature of the internal gas is installed in the external circulation pipeline, a bypass pipeline is provided on the external circulation pipeline, a control valve is installed on the bypass pipeline, and a gas purifying device for filtering, purifying and drying the protective atmosphere is connected to the end of the bypass pipeline.
4. The energy-saving hood-type annealing furnace system according to claim 1, wherein the protective atmosphere in the furnace chamber of the low-temperature annealing furnace table is completely replaced before entering the inter-furnace circulation state.
5. The method of using the energy-saving hood-type annealing furnace system according to claim 1, characterized by comprising the following specific steps:
s1, placing a material to be treated on an annealing furnace table of a first hood-type annealing furnace, covering an inner hood to isolate internal atmosphere from external atmosphere, then buckling a heating hood on the outer side of the inner hood, switching a two-position three-way valve to a furnace internal circulation state, starting replacement of protective atmosphere in a furnace chamber, enabling the first hood-type annealing furnace to enter a heating procedure, generating heat by the heating hood to heat the inner hood, transmitting temperature to the interior of the furnace chamber by the inner hood, switching the two-position three-way valve, enabling the first hood-type annealing furnace to be in the furnace internal circulation state, starting a circulating fan in the first hood-type annealing furnace, enabling the protective atmosphere in the furnace chamber to circulate, transmitting the heat to the material to be treated, and continuously increasing the temperature of the material;
s2, after the temperature of the material reaches the preset temperature and the heat preservation is carried out for enough time to finish annealing, starting to enter a cooling process, simultaneously, placing another material to be treated on an annealing furnace table of an adjacent second hood-type annealing furnace, covering an inner hood to isolate the internal atmosphere from the external atmosphere, then buckling a heating hood on the outer side of the inner hood, replacing the protective atmosphere in the furnace chamber, and entering a preheating process by the second hood-type annealing furnace;
s3, simultaneously switching two three-way valves of the two hood-type annealing furnaces to enable the two three-way valves to be in a circulating state between the furnaces, conveying high-temperature protective atmosphere in the first hood-type annealing furnace to the second hood-type annealing furnace for heating materials to be treated in the first hood-type annealing furnace, and conveying low-temperature protective atmosphere in the second hood-type annealing furnace to the first hood-type annealing furnace for cooling the materials subjected to internal annealing treatment;
s4, when the internal temperatures of the two hood-type annealing furnaces are close, specifically, when the temperature difference of protective atmosphere in the external circulation pipelines of the two annealing furnaces is less than 100 ℃, switching the two three-way valves to be in a furnace circulation state, and independently operating the two hood-type annealing furnaces, taking down the heating hood of the first hood-type annealing furnace, fastening the cooling hood, finally cooling the internal materials, and simultaneously igniting and heating the heating hood of the second hood-type annealing furnace to heat the internal materials to a target temperature;
s5, after the cooling of the materials in the first hood-type annealing furnace is finished, discharging the materials and charging the new materials, covering the inner hood to isolate the internal atmosphere from the external atmosphere, buckling the heating hood on the outer side of the inner hood, and replacing the internal protective atmosphere.
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