CN114015857A - Ultrafast oxidation-free cooling method and device for pentane medium - Google Patents
Ultrafast oxidation-free cooling method and device for pentane medium Download PDFInfo
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- CN114015857A CN114015857A CN202111108499.4A CN202111108499A CN114015857A CN 114015857 A CN114015857 A CN 114015857A CN 202111108499 A CN202111108499 A CN 202111108499A CN 114015857 A CN114015857 A CN 114015857A
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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
- C21D9/573—Continuous furnaces for strip or wire with cooling
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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
Abstract
The invention relates to an ultra-fast oxidation-free cooling method and a grabbing device for a pentane medium, wherein the method comprises the following steps: the high-temperature strip steel coming out of the heating section of the continuous annealing furnace continuously passes through a phase-change cooling section isolated from the external atmosphere at a certain speed, a nozzle is arranged in the phase-change cooling section, low-temperature high-pressure liquid pentane is uniformly sprayed onto the surface of the high-temperature strip steel through the nozzle, phase change occurs in the process, the pentane is vaporized and absorbs heat after heat exchange with the strip steel, the temperature of the strip steel is increased, the strip steel is cooled, the pentane is vaporized and absorbs heat to form a gas state, the gas state is filled in the hearth space of the cooling section, and the gas state is extracted from the hearth of the cooling section by a fan. According to the cooling device, the neutral medium pentane (C5H12) is used for cooling the strip steel subjected to high-temperature annealing on the surface of the strip steel in a vaporization heat absorption mode, the process requirement of the ultra-high-strength steel on the ultra-fast cooling rate is met, the strip steel can be prevented from being oxidized in the cooling process, the investment and production cost are reduced, and the pollutant emission is reduced.
Description
Technical Field
The invention belongs to the technical field of cooling of continuous annealing furnaces, and particularly relates to an ultra-fast oxidation-free cooling method and equipment for a pentane medium.
Background
The advanced typical technology of the cooling mode of the current domestic and foreign continuous annealing furnace mainly comprises the following steps: gas Jet Cooling (GJC), cold Water Quenching (WQ), Roll Cooling (RC), high-speed gas jet cooling (HGJC), gas-water accelerated cooling (AcC), hot water cooling (HOWAC), water quenching and roll cooling (WQ + RC), and gas jet and roll cooling (GJC + RC) combined cooling.
The cooling technologies have respective advantages and respective disadvantages, and particularly, when high-strength (such as TRIP and DP) steel is produced, the cooling rate of the gas medium cooling technology hardly meets the process requirement of ultra-high-strength products (more than 1000 MPa), the high cooling rate is achieved only by water quenching, but water inevitably oxidizes the surface of the strip steel, so that equipment (acid washing and reheating devices) for removing an oxide layer is required to be added, the direct investment is increased, and the production cost and the emission of pollutants such as waste acid and CO2 are increased. In addition, the cooling rate and uniformity of water quenching are difficult to control, so that the plate shape of the strip steel is deteriorated and the product quality is difficult to ensure.
Therefore, in order to avoid the surface oxidation of the strip steel and ensure the plate type quality, under the condition of low requirement on the product strength, the current strip steel continuous annealing rapid cooling technology mainly adopts: high hydrogen diffusion high velocity gas jet cooling (hereinafter diffusion cooling) and FLASHCOOLING high hydrogen flash cooling (hereinafter flash cooling).
The cold spreading adopts 20% H2+80% N2 atmosphere, improves the structure and the spraying capacity of a spraying system, the moving structure of a spraying box, local sealing and the like, and simultaneously increases a necessary safety protection system to improve the cooling capacity, and the cooling rate of 115 ℃/s can be obtained for strip steel with the thickness of 0.7 mm. The flash cooling adopts 75% H2+25% N2 atmosphere, can reduce the advantages of the jet speed, the power of a cooling fan and the like under the condition of the same cooling rate, and can obtain the cooling rate of up to 160 ℃/s for strip steel with the thickness of 0.8 mm.
The two cooling methods basically meet the requirements on the premise of ensuring the surface quality of the strip steel, and make a contribution to the continuous annealing of the cold-rolled strip steel, however, with the further improvement of the requirements on high-end cold-rolled steel plates, particularly ultra-high-strength steel plates, the defects of the cooling technology are gradually revealed, and mainly appear as follows:
(1) when high-strength steel with the tensile strength of 1500MPa is produced, the cooling rate of the steel plate is required to reach 500-2000 ℃/s, and the highest cooling rates of cold expansion and flash cooling cannot meet the requirement. The method for further increasing the cooling rate is mainly to increase the speed of the air flow sprayed on the surface of the strip steel, but when the speed of the protective gas sprayed on the surface of the high-temperature strip steel exceeds 120m/s, the strip steel generates vibration to cause the shape deterioration. And, the power of circulating fan increases by a wide margin this moment, and the noise increases. Therefore, gas medium cooling technology has encountered bottlenecks in the production of ultra-high strength steel.
(2) In order to produce the ultrahigh-strength steel, a part of production units adopt a process technology of water quenching, acid washing and induction reheating, but the ultrahigh-strength steel plate produced by the process has low success rate and more defects, and the unit has complex production and operation difficulty, high investment, high production cost and high pollutant emission.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a pentane medium ultra-fast non-oxidation cooling method and equipment, the pentane medium ultra-fast non-oxidation cooling method and equipment meet the process requirement of ultra-high strength steel on ultra-fast cooling rate, the cooling device can ensure that strip steel cannot be oxidized in the cooling process, and the oxidation problem of water quenching or gas spray cooling on the strip steel is avoided, so that equipment for removing an oxide layer after acid washing, reheating and the like is saved, the investment and production cost are reduced, and the pollutant emission is reduced.
The technical scheme of the invention is realized as follows: the invention discloses a pentane medium ultra-fast non-oxidation cooling method, high-temperature strip steel from a heating section of a continuous annealing furnace continuously passes through a phase-change cooling section, a nozzle is arranged in the phase-change cooling section, liquid pentane is uniformly sprayed onto the surface of the high-temperature strip steel through the nozzle, phase change occurs in the process, the pentane is vaporized and absorbs heat after heat exchange with the strip steel and the temperature is raised, so that the temperature of the strip steel is reduced, the strip steel is cooled, the pentane is vaporized and absorbs heat to be gaseous, the space of a hearth of the cooling section is filled with the pentane medium, and the pentane medium is pumped out from the hearth of the cooling section through a fan.
Furthermore, the pentane gas pumped out by the fan is condensed and compressed, then phase change is carried out again to change into liquid pentane, the liquid pentane is introduced into the cooling section nozzle again, the liquid pentane is uniformly sprayed onto the surface of the high-temperature strip steel through the nozzle, and the continuous and ultra-fast cooling of the strip steel is realized through the circulation.
Furthermore, the pentane gas pumped out by the fan is changed into liquid state again after passing through the pentane condenser, and then enters the buffer tank for pressure stabilization again, the liquid pentane in the buffer tank enters the pentane pressurizing device through the pipeline, enters the injection device through the liquid pentane input pipeline again, and finally is injected to the surface of the strip steel through the nozzle arranged on the injection device.
Furthermore, a gas outlet is formed in the upper end of the buffer tank, the gas outlet of the buffer tank is communicated with the diffusing pipe, and non-condensable gas is discharged through the diffusing pipe; a first valve is arranged on the diffusing pipe; and a second valve is arranged on a pipeline communicated between the buffer tank and the pentane pressurizing device.
Furthermore, one end of the diffusing pipe is communicated with a gas outlet of the buffer tank, and the other end of the diffusing pipe is communicated with a gas inlet arranged in the cooling section closed hearth.
And further, the strip steel enters a cooling section closed hearth for cooling after passing through the first sealing roller, and enters a next process link after the cooling is finished through the second sealing roller.
The invention discloses a pentane medium ultra-fast non-oxidation cooling device which comprises a closed hearth, wherein a spraying device is arranged in the closed hearth, the spraying device is provided with a nozzle used for uniformly spraying liquid pentane onto the surface of high-temperature strip steel, the strip steel passing through is cooled by vaporization and heat absorption of the liquid pentane on the surface of the strip steel, a liquid pentane inlet of the spraying device is communicated with a liquid pentane input pipeline, the closed hearth is provided with a gaseous pentane outlet, and the gaseous pentane outlet of the closed hearth is communicated with a gaseous pentane extraction pipeline.
The pentane medium ultra-fast non-oxidation cooling device further comprises a fan, a pentane condenser, a buffer tank and a pentane pressurizing device, wherein an air inlet of the fan is communicated with a gaseous pentane extraction pipeline, an air outlet of the fan is communicated with an inlet of the pentane condenser, the gaseous pentane is changed into liquid pentane again through the pentane condenser, a liquid pentane outlet of the pentane condenser is communicated with an inlet of the buffer tank, an outlet of the buffer tank is communicated with an inlet of the pentane pressurizing device through a pipeline, an outlet of the pentane pressurizing device is communicated with one end of a liquid pentane input pipeline, and the other end of the liquid pentane input pipeline is communicated with a pentane inlet of the injection device.
The nozzles face the surface of the strip steel; both sides of the strip steel are provided with a plurality of nozzles.
Furthermore, a gas outlet is formed in the upper end of the buffer tank, and the gas outlet of the buffer tank is communicated with the diffusing pipe and used for discharging non-condensable gas through the diffusing pipe; a first valve is arranged on the diffusing pipe; a second valve is arranged on a pipeline communicated between the buffer tank and the pentane pressurizing device; the other end of the diffusing pipe is communicated with a gas inlet arranged on the closed hearth.
Furthermore, the strip steel inlet end and the strip steel outlet end of the closed hearth are respectively provided with a sealing roller for supporting and conveying strip steel, and the continuous passing of the strip steel is ensured while the relative isolation of the closed hearth and external air is realized through the sealing rollers.
The invention has at least the following beneficial effects: high-temperature strip steel from a heating section of the continuous annealing furnace continuously passes through a phase-change cooling section isolated from the external atmosphere at a certain speed, nozzles are arranged in the cooling section and are opposite to the two sides of the strip steel, low-temperature high-pressure liquid pentane is uniformly sprayed onto the surface of the high-temperature strip steel through the nozzles, phase change occurs in the process of pentane, the pressure is reduced, the pentane is vaporized after heat exchange is performed with the strip steel, the temperature is increased, and the temperature of the strip steel is reduced. According to the invention, neutral medium pentane (C5H12) is used for cooling the strip steel, the conformity of the physical properties of pentane and working conditions is fully utilized, and the most efficient cooling process of phase change cooling is realized, (pentane can be vaporized at the ambient temperature of about 36 ℃, the latent heat of vaporization is 343kJ/kg, which is a large amount of heat energy absorbed in the phase change process), and the process requirement of ultra-high strength steel on the ultra-fast cooling rate is met. A high cooling rate of 600 ℃/s and a heat transfer coefficient of 2000-2200W/(m2 ℃ C.) can be achieved for a strip of 1mm thickness.
The neutral medium pentane (C5H12) is used for cooling the strip steel subjected to high-temperature annealing on the surface of the strip steel in a vaporization heat absorption mode, and as the pentane chemical property is stable and the phase change point is close to the production working condition, the method can ensure that the strip steel subjected to high-temperature annealing can realize a cooling rate which is much higher than that of the traditional gas cooling mode and further realize excellent material performance in the cooling process, so that the strip steel can obtain fine grains, the martensite is converted into the ultrahigh-strength steel, the problems of the defects of oxidation and the like of the strip steel caused by the traditional water quenching or gas spray cooling mode are avoided, and the flow of the traditional production process can be shortened.
In addition, the neutral medium pentane (C5H12) is used for cooling the strip steel, and the pentane is stable in property, has no oxidability and cannot pollute the atmosphere, so that the strip steel can be prevented from being oxidized in the cooling process by the cooling device, the problem of oxidation of water quenching or gas spray cooling on the strip steel is solved, equipment for removing an oxide layer in subsequent acid washing, reheating and the like is saved, the investment and production cost are reduced, and the pollutant emission is reduced.
Pentane is vaporized by the strip steel to absorb heat and then becomes a gas state to fill the space of the cooling section hearth, the gas state is pumped out from the cooling section hearth by a circulating fan, the pumped high-temperature low-pressure pentane gas passes through a compressor, a condenser and a buffer tank in sequence, phase change is carried out again to change into high-pressure low-temperature liquid pentane, and then the liquid pentane gas is introduced into a cooling section nozzle again, and the circulation is carried out, so that the continuous ultra-fast cooling of the strip steel is realized. The condensation cost of pentane is very low, the evaporation and condensation of pentane can be carried out in a closed loop, and the loss of pentane in the process is negligible. The technology can obtain a very high cooling rate without a high injection speed, and compared with a cold expansion or flash cooling technology, the technology reduces the power of a fan and reduces the energy consumption.
The pentane circulating system is relatively independent, not only can be arranged in a newly-built unit lightly and flexibly, but also is suitable for the transformation of the existing unit adopting the gas medium cooling technology.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pentane medium ultrafast non-oxidation cooling device provided by an embodiment of the present invention.
In the attached drawing, 1 is strip steel, 2 is a first seal roll, 3 is a closed hearth, 4 is an injection device, 5 is a nozzle, 6 is a gaseous pentane extraction pipeline, 7 is a fan, 8 is a pentane condenser, 9 is a buffer tank, 10 is a pipeline, 11 is a diffusion pipe, 12 is a pentane pressurizing device, 13 is a liquid pentane input pipeline, and 14 is a second seal roll.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, the meaning of "plurality" or "a plurality" is two or more unless otherwise specified.
Example one
Referring to fig. 1, the embodiment of the invention provides a pentane medium ultra-fast non-oxidation cooling method, high-temperature strip steel 1 from a heating section of a continuous annealing furnace continuously passes through a phase-change cooling section isolated from the external atmosphere at a certain speed, a nozzle 5 is arranged in the phase-change cooling section, low-temperature high-pressure liquid pentane is uniformly sprayed onto the surface of the high-temperature strip steel 1 through the nozzle 5, pentane undergoes phase change in the process, the pentane is vaporized and absorbs heat after exchanging heat with the strip steel 1, the temperature of the strip steel 1 is increased, the strip steel 1 is cooled, the pentane is vaporized and absorbs heat to form gas, the gas is filled in a hearth space of the cooling section, and the gas is extracted from a hearth of the cooling section by a fan 7.
Further, the high-temperature low-pressure pentane gas pumped out by the fan 7 is subjected to condensation and compression treatment and then is subjected to phase change again to become low-temperature high-pressure liquid pentane, the low-temperature high-pressure liquid pentane is introduced into the cooling section nozzle 5 again, the low-temperature high-pressure liquid pentane is uniformly sprayed onto the surface of the high-temperature strip steel 1 through the nozzle 5, and the continuous ultrafast cooling of the strip steel 1 is realized through the circulation.
Further, the high-temperature low-pressure pentane gas pumped by the fan 7 is changed into liquid state again after passing through the pentane condenser 8, and then enters the buffer tank 9 for pressure stabilization again, the liquid pentane in the buffer tank 9 enters the pentane pressurizing device 12 through a pipeline, then enters the injection device 4 through the liquid pentane input pipeline 13 again, and finally is injected to the surface of the strip steel 1 through the nozzle 5 installed on the injection device 4.
Further, a gas outlet is formed in the upper end of the buffer tank 9, the gas outlet of the buffer tank 9 is communicated with the diffusing pipe 11, and non-condensable gas is discharged through the diffusing pipe 11; a first valve is arranged on the diffusing pipe 11; a second valve is arranged on a pipeline which is communicated between the buffer tank 9 and the pentane pressurizing device 12.
Further, one end of the diffusing pipe 11 is communicated with a gas outlet of the buffer tank 9, and the other end of the diffusing pipe 11 is communicated with a gas inlet arranged on the cooling section closed hearth 3.
Further, the strip steel 1 enters the cooling section closed hearth 3 for cooling after passing through the first sealing roller 2, and enters the next process link after cooling is finished through the second sealing roller 14.
Example two
Referring to fig. 1, the embodiment of the invention provides a pentane medium ultra-fast non-oxidation cooling device, which comprises a closed hearth 3, wherein a spraying device 4 is arranged in the closed hearth 3, the spraying device 4 is provided with a nozzle 5 for uniformly spraying liquid pentane onto the surface of a high-temperature strip steel 1, the strip steel 1 is cooled by vaporization and heat absorption of the liquid pentane medium on the surface of the strip steel 1, a pentane inlet of the spraying device 4 is communicated with a liquid pentane input pipeline 13, the closed hearth 3 is provided with a gaseous pentane outlet, and a gaseous pentane outlet of the closed hearth 3 is communicated with a gaseous pentane extraction pipeline 6. The invention uses pentane to vaporize and absorb heat on the surface of the strip steel 1 to cool the strip steel 1, and can obtain a high cooling rate of more than 500 ℃/s for the strip steel 1 with the thickness of 1 mm.
And a pentane treatment device is arranged between the gaseous pentane outlet of the closed hearth 3 and the pentane inlet of the injection device 4, and is used for extracting high-temperature low-pressure pentane gas in the closed hearth 3, changing the high-temperature low-pressure pentane gas into low-temperature high-pressure liquid pentane after condensation and compression treatment, and then introducing the low-temperature high-pressure liquid pentane gas into the injection device 4 again to form a circulating system. The whole system belongs to a relatively closed circulating system, and the pentane circulating system is relatively independent and has pressure and temperature changes.
Further, the pentane treatment device comprises a pentane condenser 8, a buffer tank 9 and a pentane pressurizing device 12, one end of a pentane gas extraction pipeline 6 is communicated with a pentane gas outlet of the closed hearth 3, the other end of the pentane gas extraction pipeline 6 is communicated with an air inlet of a fan 7, an air outlet of the fan 7 is communicated with an inlet of the pentane condenser 8, the pentane gas is changed into liquid pentane again through the pentane condenser 8, a liquid pentane outlet of the pentane condenser 8 is communicated with an inlet of the buffer tank 9, a liquid pentane outlet of the buffer tank 9 is communicated with an inlet of the pentane pressurizing device 12 through a pipeline 10, an outlet of the pentane pressurizing device 12 is communicated with one end of a pentane liquid input pipeline 13, and the other end of the pentane liquid input pipeline 13 is communicated with a pentane inlet of the injection device 4.
Further, the upper end of buffer tank 9 is equipped with gas outlet, the gas outlet and the diffuse pipe 11 intercommunication of buffer tank 9 for the gas that will not condense is discharged through diffuse pipe 11.
Further, a first valve is arranged on the diffusing pipe 11.
Furthermore, a second valve is arranged on a pipeline 10 which is communicated between the buffer tank 9 and the pentane pressurizing device 12.
Further, one end of the diffusing pipe 11 is communicated with a gas outlet of the buffer tank 9, and the other end of the diffusing pipe 11 is communicated with a gas inlet arranged on the closed hearth 3.
Furthermore, the inlet end of the strip steel 1 of the closed hearth 3 and the outlet end of the strip steel 1 are respectively provided with a sealing roller for supporting and conveying the strip steel 1, and the sealing rollers realize the relative isolation of the closed hearth 3 and the outside air and simultaneously ensure the continuous passing of the strip steel 1.
The high-temperature strip steel 1 from the annealing heating section continuously passes through the pentane medium ultra-fast non-oxidation cooling device at a certain speed, the strip steel 1 enters the closed hearth 3 for cooling after passing through the first sealing roller 2, and enters the next process link after cooling is finished through the second sealing roller 14.
Further, a plurality of nozzles 5 face the surface of the strip steel; both sides of the strip steel are provided with a plurality of nozzles 5 facing the surface of the strip steel. A plurality of nozzles 5 are arranged longitudinally along the strip.
In the process of quickly cooling the strip steel by pentane, pentane absorbs heat and becomes gaseous, the gaseous pentane is pumped out of the pipeline 6 and then is pumped out by the circulating fan 7, the gaseous pentane is changed into liquid again after passing through the pentane condenser 8, the pressure is regulated again through the buffer tank 9, uncondensed gas is discharged through the diffusing pipe 11, the liquid pentane enters the pentane pressurizing device 12 through the pipeline, the liquid pentane enters the injection device 4 through the liquid pentane input pipeline 13 again, and finally the liquid pentane is injected to the surfaces of the two sides of the strip steel through the nozzles 5 arranged on the injection device 4, so that the purpose of quickly cooling the strip steel is achieved through phase change heat absorption. The process is circularly repeated, and the continuous ultrafast cooling of the strip steel is realized.
The cooling device can be applied to a rapid cooling section in a strip steel continuous annealing unit, provides a technological method for producing high-quality and ultrahigh-strength steel, and also provides a technological means for other related fields with high requirements on rapid cooling and no oxidation. The neutral medium pentane (C5H12) is used for cooling the high-temperature annealed strip steel on the surface of the strip steel in a vaporization heat absorption mode, so that the ultra-high cooling rate of 600 ℃/s and the ultra-high cooling rate of 2000-2The heat transfer coefficient (taking strip steel with the thickness of 1mm as an example) realizes the ultra-fast cooling rate of the strip steel in the annealing of the A1-A3 area, does not generate pearlite, but concentrates solid solution carbon in austenite, obtains fine grains, generates martensite through ultra-fast cooling transformation, and becomes the ultra-high strength steel.
In addition, the pentane has stable chemical property and no oxidability, so that the defects of oxidation and the like of the steel strip can be avoided, and the atmosphere can not be polluted.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An ultra-fast oxidation-free cooling method for a pentane medium is characterized by comprising the following steps: the high-temperature strip steel from the heating section of the continuous annealing furnace continuously passes through the phase-change cooling section, a nozzle is arranged in the phase-change cooling section, liquid pentane is uniformly sprayed onto the surface of the high-temperature strip steel through the nozzle, the pentane undergoes phase change in the process, and after heat exchange with the strip steel, the pentane is vaporized to absorb heat and the temperature is raised, so that the temperature of the strip steel is reduced, the strip steel is cooled, the pentane is vaporized to absorb heat to be in a gaseous state, the space of a cooling section hearth is filled with the pentane, and the pentane is pumped out from the cooling section hearth through a fan.
2. The pentane medium ultra-fast non-oxidation cooling method of claim 1, wherein: the pentane gas pumped out by the fan is condensed and compressed to be changed into liquid pentane again, then the liquid pentane gas is introduced into the cooling section nozzle again, the liquid pentane gas is uniformly sprayed onto the surface of the high-temperature strip steel through the nozzle, and the continuous and ultrafast cooling of the strip steel is realized through the circulation.
3. The pentane medium ultra-fast non-oxidation cooling method as claimed in claim 2, wherein: the pentane gas pumped out by the fan is changed into liquid state again after passing through the pentane condenser, and then enters the buffer tank for re-pressure stabilization, and the liquid pentane in the buffer tank enters the pentane pressurizing device through the pipeline, enters the injection device through the liquid pentane input pipeline again, and finally is injected to the surface of the strip steel through the nozzle arranged on the injection device.
4. The ultrafast pentane medium non-oxidation cooling method of claim 3, wherein: the upper end of the buffer tank is provided with a gas outlet, the gas outlet of the buffer tank is communicated with the diffusing pipe, and non-condensable gas is discharged through the diffusing pipe; a first valve is arranged on the diffusing pipe; and a second valve is arranged on a pipeline communicated between the buffer tank and the pentane pressurizing device.
5. The ultrafast pentane medium non-oxidation cooling method of claim 4, wherein: one end of the diffusing pipe is communicated with a gas outlet of the buffer tank, and the other end of the diffusing pipe is communicated with a gas inlet of the cooling section closed hearth.
6. The pentane medium ultra-fast non-oxidation cooling method of claim 1, wherein: the strip steel enters a cooling section closed hearth for cooling after passing through a first sealing roller, and enters a next process link after cooling is finished through a second sealing roller.
7. The ultrafast oxidation-free pentane medium cooling device is characterized in that: the device comprises a closed hearth, wherein a spraying device is arranged in the closed hearth, the spraying device is provided with a nozzle used for uniformly spraying liquid pentane onto the surface of high-temperature strip steel, the passing strip steel is cooled by the heat absorption of the liquid pentane in vaporization on the surface of the strip steel, a liquid pentane inlet of the spraying device is communicated with a liquid pentane input pipeline, the closed hearth is provided with a gaseous pentane outlet, and the gaseous pentane outlet of the closed hearth is communicated with a gaseous pentane extraction pipeline.
8. The pentane medium ultra-fast non-oxidation cooling device of claim 7, wherein: the pentane gas inlet and the pentane gas outlet of the fan are communicated with an inlet of the pentane condenser, the pentane gas is changed into liquid pentane through the pentane condenser, a liquid pentane outlet of the pentane condenser is communicated with an inlet of the buffer tank, an outlet of the buffer tank is communicated with an inlet of the pentane pressurizing device through a pipeline, an outlet of the pentane pressurizing device is communicated with one end of a liquid pentane input pipeline, and the other end of the liquid pentane input pipeline is communicated with a pentane inlet of the injection device.
9. The pentane medium ultra-fast non-oxidation cooling device of claim 7, wherein: the upper end of the buffer tank is provided with a gas outlet, and the gas outlet of the buffer tank is communicated with the diffusing pipe and used for discharging non-condensable gas through the diffusing pipe; a first valve is arranged on the diffusing pipe; a second valve is arranged on a pipeline communicated between the buffer tank and the pentane pressurizing device; the other end of the diffusing pipe is communicated with a gas inlet arranged on the closed hearth.
10. The pentane medium ultra-fast non-oxidation cooling device of claim 7, wherein: the strip steel inlet end and the strip steel outlet end of the closed hearth are respectively provided with a sealing roller for supporting and conveying strip steel, and the continuous passing of the strip steel is ensured while the relative isolation of the closed hearth and external air is realized through the sealing rollers.
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