CN218755949U - Ultrafast oxidation-free cooling device for pentane medium - Google Patents
Ultrafast oxidation-free cooling device for pentane medium Download PDFInfo
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- CN218755949U CN218755949U CN202122290350.4U CN202122290350U CN218755949U CN 218755949 U CN218755949 U CN 218755949U CN 202122290350 U CN202122290350 U CN 202122290350U CN 218755949 U CN218755949 U CN 218755949U
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Abstract
The utility model relates to a pentane medium ultrafast oxidation-free cooling device, including airtight furnace, circulating fan, the pentane condenser, the buffer tank, pentane pressure device, be equipped with the injection apparatus who is used for to belted steel injection liquid pentane in airtight furnace, cool off belted steel at belted steel surface vaporization heat absorption through liquid pentane, airtight furnace's gaseous pentane export is taken out pipeline and circulating fan's air inlet intercommunication through gaseous pentane, the gas outlet of fan and the import intercommunication of pentane condenser, become gaseous pentane liquid again through the pentane condenser, the export of pentane condenser and the import intercommunication of buffer tank, the liquid pentane export of buffer tank and pentane pressure device's import intercommunication, pentane pressure device's export is through liquid pentane input pipeline and injection apparatus's liquid pentane entry intercommunication. The utility model discloses satisfy the technological demand of super high strength steel to ultrafast cooling rate, and can guarantee that belted steel can not by the oxidation in the cooling process, reduced investment and manufacturing cost, reduced pollutant discharge.
Description
Technical Field
The utility model belongs to the technical field of the cooling of continuous annealing stove, concretely relates to pentane medium ultrafast oxidation-free cooling device.
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 velocity 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 through water quenching, but water inevitably oxidizes the surface of the strip steel, so that equipment (an acid washing and reheating device) 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, CO2 and the like 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 shape quality, under the condition of low requirement on product strength, the current strip steel continuous annealing rapid cooling technology mainly adopts: high hydrogen diffusion high-speed gas jet cooling technology (hereinafter referred to as diffusion cooling) and FLASHCOOLING high hydrogen flash cooling technology (hereinafter referred to as flash cooling).
The cooling expansion adopts the atmosphere of H2+80% by 20%, and the cooling rate of 115 ℃/s can be obtained for the strip steel with the thickness of 0.7mm by improving the structure of a spraying system, the spraying capacity, the moving structure of a spraying box, local sealing and the like and adding a necessary safety protection system to improve the cooling capacity. The flash cooling adopts an atmosphere of 75 percent H2+25 percent N2, can reduce the spraying speed, reduce 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. Thus, gas medium cooling technology has met with a bottleneck in the production of ultra-high strength steels.
(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.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a pentane medium ultrafast oxidation-free cooling device, the utility model discloses satisfy the technological demand of super high-strength steel to ultrafast cooling rate, and this cooling device can guarantee that belted steel can not be by the oxidation in the cooling process, has avoided the oxidation problem of water quenching or aerial fog cooling to belted steel to saved pickling thereafter, reheat etc. and got rid of the equipment of oxide layer, reduced investment and manufacturing cost, reduced the pollutant emission.
The technical scheme of the utility model is realized like this: the utility model discloses a pentane medium ultrafast non-oxidation cooling device, including airtight furnace, be equipped with injection apparatus in the airtight furnace, injection apparatus is equipped with the nozzle that is used for spraying liquid pentane to belted steel surface, injection apparatus's liquid pentane entry and liquid pentane input pipeline intercommunication, airtight furnace is equipped with gaseous pentane export, airtight furnace's gaseous pentane export and gaseous pentane take out the pipeline intercommunication.
Furthermore, one end of a gaseous pentane extraction pipeline is communicated with a gaseous pentane outlet of the closed hearth, the other end of the gaseous pentane extraction pipeline is communicated with an air inlet of the fan, an air outlet of the fan is communicated with an inlet of the pentane condenser, and the gaseous pentane is changed into liquid state again through the pentane condenser.
Furthermore, an outlet of the pentane condenser is communicated with an inlet of a 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 liquid pentane inlet of the injection device.
Further, an outlet of the pentane condenser is communicated with an inlet of the buffer tank, a liquid pentane 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 liquid pentane inlet of the injection device.
Further, the upper end of buffer tank is equipped with gas outlet, the gas outlet and the diffuse pipe intercommunication of buffer tank for the gas that will not condense is discharged through the diffuse pipe.
Furthermore, a first valve is arranged on the diffusing pipe.
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 formed in the closed hearth.
Furthermore, a second valve is arranged on the pipeline.
Furthermore, a plurality of nozzles face the surface of the strip steel; both sides of the strip steel are provided with a plurality of nozzles.
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 utility model discloses following beneficial effect has at least: high-temperature strip steel coming out of the annealing heating section continuously passes through a phase-change cooling section isolated from the external atmosphere at a certain speed, nozzles are arranged on two sides of the strip steel in the cooling section, 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, and after heat exchange is performed between the pentane gas and the strip steel, the pentane gas is vaporized, the temperature is raised, and the temperature of the strip steel is reduced. The utility model discloses use neutral medium pentane (C5H 12) to the band steel cooling, make full use of pentane physical property and the degree of agreeing with of operating mode condition, and then realized this kind of most efficient cooling process of phase transition cooling, (pentane just can vaporize at ambient temperature about 36 ℃, phase transition process absorbs a large amount of heat energy-latent heat of vaporization is 343 kJ/kg), satisfies the technological demand of super high-strength steel to ultrafast cooling rate. High cooling rates of 600 ℃/s and heat transfer coefficients of 2000-2200W/(m 2. DEG C) can be achieved for strip steel of 1mm thickness.
The utility model discloses a neutral medium pentane (C5H 12) cools off belted steel through high temperature annealing with vaporization heat absorption mode on belted steel surface, because of the pentane chemical stability, the point of transformation is close the production operating mode, through the utility model discloses can guarantee belted steel behind the high temperature annealing in the cooling process, can realize the cooling rate who is much higher than traditional gas cooling mode and then realize good material performance, make belted steel obtain tiny crystalline grain, realize that the martensite changes into super high strength steel, avoided traditional shrend or aerial fog cooling mode again to cause the problem of defects such as oxidation to belted steel, still can shorten traditional production technology's flow.
Just the utility model discloses use neutral medium pentane (C5H 12) to the belted steel cooling, because of pentane nature is stable, do not have the oxidability, can not cause the pollution to the atmosphere yet, can guarantee through this cooling device that belted steel can not be by the oxidation in the cooling process, avoided the oxidation problem of water quenching or aerial fog cooling to belted steel to saved pickling thereafter, reheat etc. and got rid of the equipment of oxide layer, reduced investment and manufacturing cost, reduced pollutant discharge.
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 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 an ultrafast oxidation-free pentane medium 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 circulating 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 described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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 merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, 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 to implicitly indicate 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 "a plurality" or "a plurality" is two or more unless otherwise stated.
Referring to fig. 1, the embodiment of the utility model provides a pentane medium ultrafast oxidation-free cooling device, including airtight furnace 3, be equipped with injection apparatus 4 in the airtight furnace 3, injection apparatus is equipped with a plurality of nozzles 5 that are used for to belted steel surface injection liquid pentane, cools off belted steel through liquid pentane medium vaporization heat absorption on belted steel surface, injection apparatus 4's liquid pentane entry and liquid pentane input pipeline 13 intercommunication, airtight furnace 3 is equipped with gaseous pentane export, airtight furnace 3's gaseous pentane export and gaseous pentane take out pipeline 6 intercommunication. The utility model uses pentane to vaporize and absorb heat on the surface of the strip steel to cool the strip steel, and can obtain a high cooling rate of more than 500 ℃/s for the strip steel with the thickness of 1 mm.
And a pentane treatment device is arranged between a gaseous pentane outlet of the closed hearth 3 and a pentane inlet of the injection device 4, and is used for extracting high-temperature low-pressure pentane gas in the closed hearth 3, carrying out condensation and compression treatment, then carrying out phase change again to obtain low-temperature high-pressure liquid pentane, and then introducing the low-temperature high-pressure liquid pentane 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 circulating fan 7 and a pentane condenser 8, wherein the air inlet of the circulating fan 7 is communicated with the gaseous pentane extraction pipeline 6, the air outlet of the circulating fan 7 is communicated with the inlet of the pentane condenser 8, and the gaseous pentane is changed into a liquid state again through the pentane condenser 8.
Further, when the pentane treatment device is not provided with the buffer tank 9, the outlet of the pentane condenser is communicated with the inlet of a pentane pressurizing device through a pipeline, the 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 the liquid pentane inlet of the injection device.
Further, when the pentane treatment device is provided with a buffer tank 9, the outlet of the pentane condenser 8 is communicated with the inlet of the buffer tank 9, the liquid pentane outlet of the buffer tank 9 is communicated with the inlet of a pentane pressurizing device 12 through a pipeline 10, the outlet of the pentane pressurizing device 12 is communicated with one end of a liquid pentane input pipeline 13, and the other end of the liquid pentane input pipeline 13 is communicated with the liquid pentane inlet of the injection device 4.
Further, a gas outlet is formed in the upper end of the buffer tank 9, and the gas outlet of the buffer tank 9 is communicated with a diffusing pipe 11 and used for discharging non-condensable gas through the diffusing pipe 11; the other end of the diffusing pipe 11 is communicated with a gas inlet arranged on the closed hearth 3.
And a second valve is arranged on the pipeline 10.
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 which face the surface of the strip steel. A plurality of nozzles 5 are arranged longitudinally along the strip.
Furthermore, the strip steel inlet end and the strip steel outlet end of the closed hearth 3 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 3 and external air is realized through the sealing rollers.
Move back the high temperature belted steel that the stove heating section came out to certain speed passes through in succession the utility model discloses a pentane medium ultrafast oxidation-free cooling device, belted steel get into airtight furnace 3 and cool off behind first sealed roller 2, get into next process link through second sealed roller 14 after the cooling is accomplished.
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 circulated and 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 (C5H 12) is used for cooling the high-temperature annealed strip steel on the surface of the strip steel in a vaporization heat absorption mode, and the ultra-high cooling rate of 600 ℃/s and the ultra-high cooling rate of 2000-2200W/(m) can be obtained 2 The temperature of the steel strip is higher than that of the steel strip with the thickness of 1mm, so that the ultra-fast cooling of the steel strip in the annealing of the A1-A3 areas is realizedBut the rate of the cooling is not to generate pearlite, but the solid solution carbon is enriched in austenite, and fine grains are obtained, and the martensite is generated through ultra-fast cooling transformation, so that the ultrahigh strength steel is formed.
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 a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a pentane medium ultrafast does not have oxidation cooling device which 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 for spraying liquid pentane to the surface of strip steel, a liquid pentane inlet of the spraying device is communicated with a liquid pentane input pipeline, a gaseous pentane outlet is formed in the closed hearth, and the gaseous pentane outlet of the closed hearth is communicated with a gaseous pentane extraction pipeline.
2. The pentane medium ultra-fast non-oxidation cooling device of claim 1, wherein: one end of the gaseous pentane pumping pipeline is communicated with a gaseous pentane outlet of the closed hearth, the other end of the gaseous pentane pumping pipeline is communicated with an air inlet of the fan, and an air outlet of the fan is communicated with an inlet of the pentane condenser.
3. The pentane medium ultra-fast non-oxidation cooling device according to claim 2, wherein: the outlet of the pentane condenser is communicated with the inlet of a pentane pressurizing device through a pipeline, the 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 the liquid pentane inlet of the injection device.
4. The pentane medium ultra-fast non-oxidation cooling device of claim 2, wherein: the export of pentane condenser and the import intercommunication of buffer tank, the import intercommunication of pipeline and pentane pressure device is passed through to the liquid pentane export of buffer tank, pentane pressure device's export and liquid pentane input pipeline one end intercommunication, the other end of liquid pentane input pipeline and injection apparatus's liquid pentane entry intercommunication.
5. The pentane medium ultra-fast non-oxidation cooling device of claim 4, wherein: the upper end of buffer tank is equipped with the gas outlet, the gas outlet and the diffusion pipe intercommunication of buffer tank.
6. The pentane medium ultra-fast non-oxidation cooling device according to claim 5, wherein: and a first valve is arranged on the diffusing pipe.
7. The pentane medium ultra-fast non-oxidation cooling device according to claim 5, 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 arranged in the closed hearth.
8. The ultrafast pentane medium non-oxidation cooling device of claim 4, wherein: and a second valve is arranged on the pipeline.
9. The pentane medium ultra-fast non-oxidation cooling device of claim 1, wherein: the plurality of nozzles face the surface of the strip steel; both sides of the strip steel are provided with a plurality of nozzles.
10. The pentane medium ultra-fast non-oxidation cooling device of claim 1, wherein: and 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122290350.4U CN218755949U (en) | 2021-09-22 | 2021-09-22 | Ultrafast oxidation-free cooling device for pentane medium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122290350.4U CN218755949U (en) | 2021-09-22 | 2021-09-22 | Ultrafast oxidation-free cooling device for pentane medium |
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| Publication Number | Publication Date |
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| CN218755949U true CN218755949U (en) | 2023-03-28 |
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| CN202122290350.4U Active CN218755949U (en) | 2021-09-22 | 2021-09-22 | Ultrafast oxidation-free cooling device for pentane medium |
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