CN108148999B - Preheating system and preheating method suitable for continuous annealing and hot galvanizing - Google Patents
Preheating system and preheating method suitable for continuous annealing and hot galvanizing Download PDFInfo
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- CN108148999B CN108148999B CN201611094150.9A CN201611094150A CN108148999B CN 108148999 B CN108148999 B CN 108148999B CN 201611094150 A CN201611094150 A CN 201611094150A CN 108148999 B CN108148999 B CN 108148999B
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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
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Abstract
The invention discloses a preheating system suitable for continuous annealing and hot galvanizing and a using method thereof, and the preheating system comprises a circulating device and a smoke exhaust device, wherein the circulating device is connected with the smoke exhaust device, the circulating device comprises a furnace body, an air injection bellows, a heat exchanger, jet nozzles, a circulating air duct and a circulating fan, the air injection bellows is provided with a plurality of pairs which are all arranged in the furnace body, a plurality of jet nozzles are arranged on the opposite surfaces of each pair of air injection bellows, the heat exchanger is arranged in each air injection bellows, the air injection bellows on the same side is communicated with the air injection bellows on the same side through a waste gas pipeline, the circulating fan is provided with a plurality of pairs which are all connected with the inner side surface of the furnace; the smoke exhaust device comprises a smoke exhaust fan, a regulating valve and a smoke exhaust pipeline. The invention fully utilizes the heat energy of the combustion tail gas of the radiant tube, realizes high-speed jet flow, quickly and uniformly heats the strip steel, improves the productivity of a unit, and does not cause negative influence on the surface quality of the strip steel.
Description
Technical Field
The invention relates to the field of cold-rolled strip steel continuous heat treatment, in particular to a preheating system suitable for continuous annealing and hot galvanizing and a preheating method thereof.
Background
The air jet heating technology is applied to continuous heat treatment production lines of strip steel and nonferrous metals, is mainly used for a heat treatment heating process section in the field of nonferrous metals, and is mainly applied in a horizontal air cushion furnace, the nonferrous metal strip has higher requirement on temperature uniformity in the width direction of the strip, the blackness of the strip is lower, generally, the heating process section does not directly use a radiant tube for radiation heating, but adopts the air jet heating technology, and the air jet heating technology is shown in a foreign patent EP1507013A1 shown in figure 1: after the strip enters the heating process sections 8 and 9, the strip is heated in a jet mode by adopting a jet method and floats, the circulating gas jet strip is heated by the radiation pipe 21, is pressurized by the circulating fan 20, enters the jet air box and is jetted to the surface of the strip through the nozzle, the continuous floating heating of the strip is realized, the energy source for heating the strip comes from the heat released by the combustion of the radiation pipe, and the heating process has the advantages of higher heating speed and more uniform temperature.
The air-jet heating technology in the strip steel continuous heat treatment production line is mainly used for drying strip steel and air-jet heating in a preheating section, a drying device is generally arranged after the cleaning section of a pickling unit and a continuous annealing unit of the strip steel is rinsed or after coating equipment, because the surface of the strip steel after the previous pickling process or the continuous annealing inlet rinsing is finished has a lot of moisture, the strip steel needs to enter a drying machine for hot air drying, and the strip steel needs to be dried after the coating of the coating unit. As shown in fig. 2, the air-jet drying device mainly used in the industry at present is composed of a fan, a valve, a steam heater, a pipeline, a fan housing and the like. The fan 6 extracts fresh air from the nature and pressurizes the fresh air, then the fresh air enters the steam heater 7, the fresh air is heated in the steam heater 7, heated hot air enters the fan cover 12 through a pipeline to dry strip steel, and the hot air after drying the strip steel is discharged through the air outlets 13 and 14. In addition, steam enters the steam heater 7 through the steam inlet 2 to exchange heat with fresh air and is discharged through the steam outlet 3. The aim of the air-jet drying technology is only to eliminate the moisture on the surface of the strip steel so as to avoid corroding the surface of the strip steel, and the air-jet drying technology is not used for heating the strip steel and belongs to a heating method of a heating process section of a continuous annealing unit.
The air jet heating technology is also widely applied to a continuous annealing preheating section, generally, the traditional practice of the continuous heat treatment technology of the cold-rolled steel strip for reducing the energy consumption is to preheat the cold-rolled steel strip by using a preheating device before a heat treatment area of the steel strip, and the energy for preheating is mostly from combustion tail gas of a heating section of a radiant tube as shown in fig. 3: the flue gas after the combustion of the radiant tube enters the heat exchanger 36 from the flue gas inlet in sequence and then is discharged from the flue gas outlet. The circulating gas in the preheating section 39 completes heat exchange in the heat exchanger 36 through a pipeline, is pressurized by the circulating fan 37, enters the jet nozzle 40 through a pipeline, jets and heats the strip steel 38, and the circulating gas cooled by the strip steel 38 enters the heat exchanger 36 again for heat exchange to complete primary circulation. The disadvantages of this jet heating technique are: the heat exchanger and the circulating fan are arranged outside the preheating section of the furnace, the peripheral pipelines are complex and large, a large amount of pipeline resistance and thermal loss are caused, and the jet flow speed is generally controlled at 30m/s and is relatively low. The preheating effect is poor, the final exhaust temperature is 350-. The novel jet heating technology can be adopted to well solve the problem, the utilization rate of the energy of the existing unit can be improved, and the strip steel can be heated quickly and uniformly.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preheating system and a preheating method thereof suitable for continuous annealing and hot galvanizing, which fully utilize the heat energy of the combustion tail gas of a radiant tube, realize high-speed jet flow, quickly and uniformly heat strip steel, improve the productivity of a unit and have no negative influence on the surface quality of the strip steel.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the preheating system suitable for continuous annealing and hot galvanizing comprises a circulating device and a smoke exhaust device, wherein the circulating device is connected with the smoke exhaust device, the circulating device comprises a furnace body, air injection bellows, heat exchangers, jet flow nozzles, a circulating air duct and circulating fans, the air injection bellows are provided with a plurality of pairs and are arranged in the furnace body, the jet flow nozzles are arranged on opposite surfaces of each pair of air injection bellows, each heat exchanger is arranged in each air injection bellows, the air injection bellows on the same side edge is communicated through an exhaust gas pipeline, the circulating fans are provided with a plurality of pairs and are connected to the inner side surface of the furnace body, and each circulating fan is respectively communicated with a pair of air injection bellows through the; the smoke exhaust device comprises a smoke exhaust fan, a regulating valve and a smoke exhaust pipeline, wherein the smoke exhaust fan is communicated with the waste gas pipeline through the smoke exhaust pipeline, and the regulating valve is arranged on the smoke exhaust pipeline.
The circulating fan comprises a fan, an air suction opening, air outlets and a variable frequency motor, the front side of the fan is connected with the air suction opening, the back side of the fan is connected with the variable frequency motor, the number of the air outlets is two, the two air outlets are respectively connected to the upper end and the lower end of the fan, and each air outlet is connected with a circulating air duct.
The heat exchanger is a shell-and-tube heat exchanger.
The jet flow nozzles are all round nozzles or slit nozzles, and the distance between every two jet flow nozzles is 50-300 mm.
When the jet nozzle is a circular nozzle, the diameter is 8-20 mm.
The air injection air box is made of heat-resistant stainless steel and is manufactured by laser blanking processing.
And a pair of sealing rollers is respectively arranged on the outer sides of the two ends of the furnace body.
In another aspect, a preheating method of an energy-saving continuous heat treatment system includes the steps of:
s1, introducing combustion waste gas of a radiant tube into each air injection air box through a waste gas pipeline in a circulating device, and converting heat in the combustion waste gas by using a heat exchanger in the air injection air box;
s2, jetting the heat converted by the heat exchanger onto the strip steel by using a jet nozzle, and carrying out jet heating on the strip steel;
s3, pressurizing circulating gas generated after jet heating of the jet nozzle through a circulating fan, and enabling the circulating gas to enter a jet air box through a circulating channel, so that the circulating gas is subjected to heat exchange with combustion waste gas of the radiant tube in the jet air box and then to be jetted onto strip steel through the jet nozzle, and the circulating gas in the furnace body forms primary circulation;
and S4, the waste gas is combusted by the radiation pipe after the heat is converted by the converter and is exhausted outwards by the smoke exhaust fan through a smoke exhaust pipeline.
In the step S2, the jet speed of the jet nozzle is 40-100 m/S.
In the technical scheme, the invention has the following beneficial effects:
1. the heat energy of the tail gas burned by the radiant tube can be fully, quickly and effectively utilized, the heat utilization rate of the fuel gas is improved, and the air injection air box, the heat exchanger and the circulating fan of the system are all arranged in the furnace body, so that the on-way heat and pressure loss of the pipeline is reduced to the maximum extent;
2. the invention can quickly, cleanly and uniformly heat the strip steel, even heat the strip steel to 200-350 ℃ or even higher in a short time, which is far higher than the strip steel of 100-150 ℃ in the prior art, and because the way of heating the strip steel by circulating gas jet in the furnace body is adopted, the surface quality of the strip steel can not be negatively influenced;
3. the circulating fan adopts frequency conversion control, can automatically adjust the rotating speed of the circulating fan according to the flow of the combustion waste gas, and can reduce the electric energy input of the circulating fan to the maximum extent.
Drawings
FIG. 1 is a schematic structural diagram of the foreign patent EP1507013A 1;
FIG. 2 is a schematic structural diagram of a conventional air-jet drying device;
FIG. 3 is a schematic structural view of a preheating section of a conventional continuous annealing;
FIG. 4 is a schematic structural view of the present invention;
FIG. 5 is a left side view of FIG. 4;
FIG. 6 is a schematic view of the circulating fans installed on both sides in the furnace body according to the present invention;
fig. 7 is a schematic view of the longitudinal arrangement of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 4 to 5, the preheating system for continuous annealing and hot galvanizing provided by the present invention includes a circulating device and a smoke exhaust device, the circulating device is connected to the smoke exhaust device, the circulating device includes a furnace body 100, air-jet wind boxes 101, heat exchangers 102, jet nozzles 103, a circulating air duct 104 and a circulating fan 105, the air-jet wind boxes 101 have a plurality of pairs, all of which are disposed in the furnace body 100, a plurality of jet nozzles 103 are disposed on opposite surfaces of each pair of air-jet wind boxes 101, the jet nozzles 103 are used for jetting and heating the strip steel 99, a heat exchanger 102 is disposed in each air-jet wind box 101, the air-jet wind boxes 101 on the same side are communicated through a waste gas duct 106, the waste gas duct 106 is used for introducing the waste gas burned by the radiant tube into the air-jet wind boxes 101, and the gas burned by the radiant tube is natural gas, so that the burned waste gas is, the circulating fans 105 are connected to the inner side of the furnace body 100, each circulating fan 105 is respectively communicated with a pair of air-jet bellows 101 through a circulating air duct 104, each pair of air-jet bellows 101 is connected and provided with one circulating fan 105, the circulating fans 105 pressurize circulating gas which is jetted by jet nozzles 103 and heats strip steel 99, the circulating gas enters the air-jet bellows 101 from the circulating air duct, and is subjected to heat exchange with combustion waste gas of the radiant tubes after completing heat exchange, and then is jetted to the strip steel 99 through the jet nozzles 103, so that the circulating gas in the furnace body 100 completes one circulation, the circulating gas is also protective gas in the furnace body 100 and mainly used for preheating the strip steel 99 in the furnace body 100, the jet gas in fig. 1 is fresh air which is absorbed from the nature, and the main function of the hot fresh air is dehumidification.
The smoke exhaust device comprises a smoke exhaust fan 106, a regulating valve 107 and a smoke exhaust pipeline 108, wherein the smoke exhaust fan 106 is communicated with the waste gas pipeline 106 through the smoke exhaust pipeline 108, the regulating valve 107 is arranged on the smoke exhaust pipeline, residual circulating gas of the heat exchanger 102 in the air injection air box 101 is subjected to heat exchange and then is exhausted from the smoke exhaust fan 106 through the smoke exhaust pipeline 108, and the regulating valve 107 is used for opening and closing the smoke exhaust pipeline 108 and regulating the flow of waste gas in the smoke exhaust pipeline 108.
Preferably, the circulating fan 105 comprises a fan 109, a suction opening 110, two air outlets 111 and a variable frequency motor 112, wherein the front surface of the fan 109 is connected with the suction opening 110 for sucking the circulating air in the furnace body 100, the back surface of the fan 109 is connected with the variable frequency motor 112, the two air outlets 111 are respectively connected with the upper end and the lower end of the fan 109, each air outlet 111 is connected with the circulating air duct 104 for feeding the circulating air into the air-jet box 101, and the variable frequency motor 112 can adjust the jet speed of the jet nozzle 103 according to the thermal load condition of the unit to control the heating speed of the strip steel 99 and the heat exchange amount of the combustion waste gas of the remaining radiation pipes of the circulating fan 105, thereby ensuring that the whole body of the invention is always in an optimal working state.
Preferably, the heat exchanger 102 is a shell-and-tube heat exchanger, and since the radiant tube combustion exhaust gas and the circulating gas in the furnace body 100 complete heat exchange in the air injection wind box 101, the heat exchanger 102 can effectively utilize the heat energy of the radiant tube combustion exhaust gas.
Preferably, according to the law of forced convection heat transfer of jet, the distance from the jet nozzle 103 to the strip steel 99 has a great influence on the convection heat transfer coefficient of the surface of the strip steel 99, so that the jet nozzles 103 are all arranged as circular nozzles or slit-shaped nozzles, and the distance from the jet nozzle 103 to the strip steel 99 should also be less than 7 times the width of the nozzle or the diameter of the spray hole. The distance between every two jet flow nozzles is 50-300 mm. When the jet nozzle 103 is a circular nozzle, the diameter is 8-20 mm, so that the convection heat exchange coefficient and the return air resistance of jet heating are obviously influenced.
Preferably, the exhaust temperature of the combustion exhaust gas of the radiant tube is high, generally 400 to 700 ℃, so that the air-jet bellows 101 is made of heat-resistant stainless steel and is manufactured by laser blanking processing so as to control the precision of the size
Preferably, a pair of sealing rollers 113 is further disposed on the outer sides of the two ends of the furnace body 100, respectively, for isolating the influence of the air outside the furnace body 100 on the atmosphere inside the furnace body 100, and simultaneously eliminating the influence of the furnace body 100 on the heating and burning atmosphere of the radiant tube.
As shown in fig. 6, in a special case, if the air volume of the jet flow is required or the installation space is required, the circulation fans 105 may be installed on both sides in the furnace body 100. The operation of the circulating fan 105 needs to consume a certain amount of electric energy, the power of the circulating fan 105 is in positive correlation with the heat energy utilization rate of the waste gas combusted by the radiation tube, in order to fully utilize the heat energy of the waste gas combusted by the radiation tube and control the power consumption of the circulating fan 105 in the preheating section within a reasonable application range, all parameters of the system need to be fully optimized, so that the system can operate under a reasonable working condition.
As shown in FIG. 7, the present invention can also be arranged longitudinally according to the needs of the production site, so that the present invention has flexible design, strong field operability and practicability.
The invention discloses a preheating method of an energy-saving continuous heat treatment system, which comprises the following steps:
s1, a waste gas pipeline 106 in the circulating device introduces the combustion waste gas of the radiant tube into each air injection air box 101, and heat in the combustion waste gas is converted by a heat exchanger 102 in the air injection air box 101;
s2, jetting the heat converted by the heat exchanger 102 onto the strip steel 99 by using a jet nozzle 103 to jet and heat the strip steel 99;
s3, pressurizing circulating gas generated after jet heating of the jet nozzle 103 through a circulating fan 105, and then entering the jet air box 101 through a circulating channel 104, so that the circulating gas is subjected to heat exchange with the combustion waste gas of the radiation tube in the jet air box 101 and then is jetted onto the strip steel 99 through the jet nozzle 103, and the circulating gas in the furnace body 100 forms primary circulation; unlike fig. 3, the circulating gas in fig. 3 is mostly arranged outside the furnace and the heat exchanger is also arranged outside the furnace body, resulting in a large amount of on-way heat and pressure losses;
and S4, the waste gas is combusted by the radiant tube after the heat is converted by the converter 102 and is exhausted outwards by the smoke exhaust fan 106 through the smoke exhaust pipeline 108, and the regulating valve 107 on the smoke exhaust pipeline 108 controls the amount of the waste gas.
Preferably, in the step S2, the jet heating mainly adopts a heating mode of jet jetting 103 to the strip steel 99, and the jet speed of the jet nozzle is 40-100 m/S, so as to ensure the heat convection coefficient of the surface of the strip steel 99 and meet the heating speed of the strip steel 99.
It is important to point out that the waste gas is always in the furnace body before being discharged out of the waste gas pipeline, and is separated from the circulating gas through the pipe and the shell pass of the heat exchanger, so that the cleanliness of jet flow gas is ensured, the energy loss of the waste gas burned by the radiant tube is effectively prevented, the energy loss of the whole circulating device can only be dissipated through the outer wall of the furnace shell, the energy loss is generally lower than 5%, a large amount of energy is ensured to be absorbed by strip steel, and the residual heat energy of the waste gas burned by the radiant tube is fully utilized.
In summary, generally speaking, for 0.8mm strip steel, the average heating speed of the jet heating technology is greater than 30 ℃/s, while the temperature of the combustion tail gas of the radiant tube is gradually reduced after passing through a plurality of groups of jet wind boxes and heat exchangers connected in series, and generally the exhaust gas temperature can be lower than 200 ℃ (the waste heat recovery rate accounts for 15-20% of the input energy of system fuel gas).
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (6)
1. A preheating system suitable for continuous annealing and hot galvanizing is characterized by comprising a circulating device and a fume extractor, wherein the circulating device is connected with the fume extractor,
the circulating device comprises a furnace body, jet air boxes, heat exchangers, jet nozzles, a circulating air channel and circulating fans, wherein the jet air boxes are provided with a plurality of pairs and are all arranged in the furnace body, a plurality of jet nozzles are arranged on opposite surfaces of each pair of jet air boxes, each jet air box is internally provided with one heat exchanger, the jet air boxes on the same side edge are communicated through a waste gas pipeline, the circulating fans are provided with a plurality of pairs and are all connected to the inner side surface of the furnace body, and each circulating fan is respectively communicated with a pair of jet air boxes through the circulating air channel;
the smoke exhaust device comprises a smoke exhaust fan, a regulating valve and a smoke exhaust pipeline, the smoke exhaust fan is communicated with the waste gas pipeline through the smoke exhaust pipeline, the regulating valve is arranged on the smoke exhaust pipeline,
wherein the heat exchanger is a shell-and-tube heat exchanger,
the air-jet air box is made of heat-resistant stainless steel and is manufactured by laser blanking processing,
the circulating fan comprises a fan, an air suction opening, air outlets and a variable frequency motor, the front side of the fan is connected with the air suction opening, the back side of the fan is connected with the variable frequency motor, the number of the air outlets is two, the two air outlets are respectively connected to the upper end and the lower end of the fan, and each air outlet is connected with a circulating air duct.
2. The preheating system suitable for continuous annealing and hot galvanizing of claim 1, wherein the jet nozzles are circular nozzles or slit nozzles, and the distance between every two jet nozzles is 50-300 mm.
3. The preheating system suitable for continuous annealing and hot galvanizing of claim 2, wherein the diameter of the jet nozzle is 8-20 mm when the jet nozzle is a circular nozzle.
4. The preheating system suitable for continuous annealing and hot galvanizing of claim 1, wherein a pair of sealing rollers are respectively arranged on the outer sides of the two ends of the furnace body.
5. A preheating method for a preheating system suitable for continuous annealing and hot galvanizing according to claim 1, characterized by comprising the following steps:
s1, introducing combustion waste gas of a radiant tube into each air injection air box through a waste gas pipeline in a circulating device, and converting heat in the combustion waste gas by using a heat exchanger in the air injection air box;
s2, jetting the heat converted by the heat exchanger onto the strip steel by using a jet nozzle, and carrying out jet heating on the strip steel;
s3, pressurizing circulating gas generated after jet heating of the jet nozzle through a circulating fan, and enabling the circulating gas to enter a jet air box through a circulating channel, so that the circulating gas is subjected to heat exchange with combustion waste gas of the radiant tube in the jet air box and then to be jetted onto strip steel through the jet nozzle, and the circulating gas in the furnace body forms primary circulation;
and S4, the waste gas is combusted by the radiation pipe after the heat is converted by the converter and is exhausted outwards by the smoke exhaust fan through a smoke exhaust pipeline.
6. The preheating method according to claim 5, wherein in the step S2, the jet velocity of the jet nozzle is 40-100 m/S.
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| CN111644128A (en) * | 2020-07-09 | 2020-09-11 | 山东齐鲁增塑剂股份有限公司 | Transformation method for saving electric energy of heat treatment system in phthalic anhydride production process |
| CN112756162A (en) * | 2020-12-24 | 2021-05-07 | 山东国铭球墨铸管科技有限公司 | Energy-saving coating system for nodular cast iron pipe |
| CN113210147B (en) * | 2021-05-21 | 2022-11-08 | 重庆赛迪热工环保工程技术有限公司 | Nozzle structure and special sectional cooler for zinc-aluminum-magnesium with same |
| CN117737360A (en) * | 2022-09-15 | 2024-03-22 | 宝山钢铁股份有限公司 | High-speed jet and radiation composite heating device and rapid heating method thereof |
| CN117737393A (en) * | 2022-09-15 | 2024-03-22 | 宝山钢铁股份有限公司 | Jet radiant tube preheating system |
| CN115491628B (en) * | 2022-09-23 | 2024-01-19 | 南通市一帆钢绳有限公司 | Be used for wire rope tinning processingequipment |
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| JPS5825734B2 (en) * | 1980-08-12 | 1983-05-30 | 中外炉工業株式会社 | Radiant tube type continuous heat treatment furnace |
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| WO2011072883A1 (en) * | 2009-12-15 | 2011-06-23 | Siemens Vai Metals Technologies Sas | Equipment and method for preheating a continuously moving steel strip |
| CN101871042A (en) * | 2010-06-25 | 2010-10-27 | 中冶南方(武汉)威仕工业炉有限公司 | Method and device for reusing flue gas waste heat of annealing furnace of continuous annealing unit |
| CN102002559B (en) * | 2010-10-18 | 2012-06-06 | 贾会平 | Annealing method and device of bell type furnaces |
| CN202017038U (en) * | 2011-04-02 | 2011-10-26 | 金川集团有限公司 | Copper and copper alloy continuous roller hearth type annealing furnace |
| CN203144452U (en) * | 2013-03-15 | 2013-08-21 | 南京年达炉业科技有限公司 | Continuous annealing furnace |
| CN106119515A (en) * | 2016-08-17 | 2016-11-16 | 包头市威丰稀土电磁材料股份有限公司 | Residual neat recovering system for the annealing of tunnel type orientation silicon steel continuous high temperature |
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| CN201387250Y (en) * | 2009-03-25 | 2010-01-20 | 耿凯 | Heat exchanger |
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