KR20040055998A - Apparatus for cooling galvanizing zinc plating steel with improved cooling ability - Google Patents
Apparatus for cooling galvanizing zinc plating steel with improved cooling ability Download PDFInfo
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- KR20040055998A KR20040055998A KR1020020082500A KR20020082500A KR20040055998A KR 20040055998 A KR20040055998 A KR 20040055998A KR 1020020082500 A KR1020020082500 A KR 1020020082500A KR 20020082500 A KR20020082500 A KR 20020082500A KR 20040055998 A KR20040055998 A KR 20040055998A
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- gas
- cooling
- steel sheet
- compressor
- temperature
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- 238000001816 cooling Methods 0.000 title claims abstract description 80
- 229910000831 Steel Inorganic materials 0.000 title claims description 34
- 239000010959 steel Substances 0.000 title claims description 34
- 238000007747 plating Methods 0.000 title claims description 12
- 238000005246 galvanizing Methods 0.000 title abstract description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title description 4
- 229910052725 zinc Inorganic materials 0.000 title description 4
- 239000011701 zinc Substances 0.000 title description 4
- 239000007789 gas Substances 0.000 claims abstract description 85
- 239000000112 cooling gas Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 14
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 12
- 239000008397 galvanized steel Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 abstract description 12
- 239000007924 injection Substances 0.000 abstract description 12
- 239000002826 coolant Substances 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 4
- 229910052742 iron Inorganic materials 0.000 abstract 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 210000004894 snout Anatomy 0.000 description 2
- 229910000807 Ga alloy Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
Classifications
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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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/007—After-treatment
-
- 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
-
- 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
Description
본 발명은 냉각능이 향상된 용융아연도금강판의 냉각장치에 관한 것으로서, 보다 상세하게는 상온의 분사가스 대신 압축기 및 팽창기를 이용하여 저온의 분사가스를 냉각매체로 사용함으로써 도금강판의 냉각목표량을 달성하고, 높은 충돌압으로 인한 진동 문제를 해결할 수 있는 냉각능이 향상된 용융아연도금강판의 냉각장치에 관한 것이다.The present invention relates to a cooling apparatus of a hot-dip galvanized steel sheet with improved cooling ability, and more particularly, by using a low-temperature injection gas as a cooling medium by using a compressor and an expander instead of the injection gas at room temperature, and achieving a cooling target amount of the plated steel sheet. The present invention relates to a cooling apparatus of a hot-dip galvanized steel sheet with improved cooling ability to solve vibration problems caused by high impact pressure.
연속용융도금라인(Continuous Galvanizing Line; CGL)은 여러 단위 공정들로 구성되어 있으나, 그 핵심공정은 도 1에 나타낸 바와 같이 도금욕, 에어나이프(Air Knife), 가스젯 냉각기(Gas Jet Cooler)로 구성된 도금공정이다.Continuous Galvanizing Line (CGL) is composed of several unit processes, but the core process is a plating bath, air knife, gas jet cooler as shown in FIG. It is a plating process.
용융도금공정을 간략히 설명하면 다음과 같다.The hot dip plating process is briefly described as follows.
즉, 소둔로(미도시)에서 열처리된 강판(8)이 스나우트(Snout; 1)를 통해 도금욕조(3)의 아연용탕 속으로 유입된 후 도금욕조(3)를 빠져 나오면서 강판 표면에는 용융아연이 부착된다.That is, the steel sheet 8 heat-treated in the annealing furnace (not shown) is introduced into the zinc molten metal of the plating bath 3 through the snout 1 and then melted on the surface of the steel sheet while exiting the plating bath 3. Zinc is attached.
부착된 용융아연은 에어나이프(4)에서 고속으로 분사되는 가스에 의해 적정 두께로 조절된 후, 가스젯 냉각기에 의한 냉각대(11)를 통과하면서 냉각되어 응고된다.The attached molten zinc is adjusted to an appropriate thickness by the gas injected at high speed from the air knife 4, and then cooled and solidified while passing through the cooling table 11 by the gas jet cooler.
도금강판(7)은 냉각 공정 중에 고속가스의 충격에 의해서 진동, 휨 또는 떨림 현상이 나타날 수 있고, 이로 인해 강판의 흠집이나 긁힘 불량이 나타날 수 있으며, 에어나이프(4)에서 도금 두께를 정밀하게 제어할 수 없는 문제점이 발생한다.The plated steel sheet 7 may be vibrated, warped or shaken due to the impact of high-speed gas during the cooling process, which may cause scratches or scratches of the steel plate, and precisely plated thickness of the air knife 4. An uncontrollable problem occurs.
이러한 냉각공정의 문제는 스트립의 폭 증가에 따른 냉각속도 증가의 요구가 더욱 커짐에 따라 문제의 중요성이 더욱 커지고 있다.The problem of the cooling process is that the importance of the problem is increasing as the demand for increasing the cooling rate increases with increasing the width of the strip.
일반적으로 강판의 진동문제로 인해 가스의 분사 속도는 마하수의 1/3을 초과하지 않는다.In general, due to the vibration problem of the steel sheet, the injection speed of the gas does not exceed 1/3 of the Mach number.
종래의 가스젯 냉각기를 이용한 냉각대(11)는 도 2에서 볼 수 있듯이 냉각존 내의 기사용된 가스를 가스라인(9a)을 통하여 취입하여 냉각수를 냉매로 사용하는 열교환기(21)를 거쳐 냉각된 다음, 상온에서 송풍기(31)에 의해 도금강판(7)에 분사하는 구조로 되어 있다.As shown in FIG. 2, the cooling table 11 using the conventional gas jet cooler cools the gas used in the cooling zone through the gas line 9a through the heat exchanger 21 using the cooling water as the refrigerant. Then, it is a structure which sprays to the plated steel plate 7 by the blower 31 at normal temperature.
이에 따라 도금강판(7)과 노즐의 기하학적 형상이 결정되고 나면, 도금강판(7)과 가스 사이의 전열량은 전적으로 가스분사노즐에서의 분사유량에 의해 결정된다.Accordingly, once the geometrical shapes of the plated steel sheet 7 and the nozzle are determined, the heat transfer amount between the plated steel sheet 7 and the gas is entirely determined by the injection flow rate in the gas injection nozzle.
즉, 도금강판(7)의 이동속도가 증가하거나 판폭이 증가하여 냉각부하가 증가한다면 강판(7)을 냉각시키기 위해서는 가스유량을 증가시켜야 하며, 이는 강판(7)의 진동을 초래하여 도금품질에 나쁜 영향을 미치게 된다.That is, if the moving speed of the plated steel sheet 7 increases or the width of the plate increases, the cooling load increases, so that the gas flow rate must be increased to cool the steel sheet 7, which causes vibration of the steel sheet 7 to affect the plating quality. It will have a bad effect.
냉각공정 중 나타나는 도금강판(7)의 진동을 억제하기 위한 여러 가지 방법이 제시되어 있다.Various methods for suppressing the vibration of the plated steel sheet 7 appearing during the cooling process have been proposed.
그 중 가장 간단한 방법은 도금강판(7)에 작용하는 장력을 증가시키는 것이 있으나, 장력이 과도할 경우 강판(7)에 높은 전단응력이 작용하여 변형 또는 파단현상이 발생될 수 있다.The simplest method is to increase the tension acting on the plated steel sheet (7), but if the tension is excessive, high shear stress acts on the steel sheet (7) may cause deformation or fracture.
또 다른 방법으로서, 미합중국 특허 제6,126,891호에 개시된 수소함량이 높은 혼합가스를 사용하여 냉각하는 방법이 개시되어 있다.As another method, a method of cooling using a mixed gas having a high hydrogen content disclosed in US Pat. No. 6,126,891 is disclosed.
이 기술은 강판의 산화를 방지하기 위해서 수소-질소 혼합가스를 냉각용 가스로 사용하는데, 통상 수소 5%와 질소 95%의 비율로 혼합하여 사용한다.This technique uses a hydrogen-nitrogen mixed gas as a cooling gas in order to prevent oxidation of the steel sheet, but is usually used in a mixture of 5% hydrogen and 95% nitrogen.
상기 혼합가스 중 수소의 함량이 증가할수록 혼합가스의 비열이 증가하여 냉각효율이 증가하기 때문에 최대 50%까지 수소 함량을 증가시켜 사용할 수 있다.As the content of hydrogen in the mixed gas increases, the specific heat of the mixed gas increases to increase the cooling efficiency, thereby increasing the hydrogen content by up to 50%.
그러나, 이와 같이 수소함량이 증가된 혼합가스를 사용하면 적은 유량으로도 충분히 목표 냉각량을 달성할 수 있기 때문에 강판의 진동을 감소시킬 수 있으나, 혼합가스 중 수소함량이 증가할수록 폭발의 위험성이 증가하기 때문에 수소함량이 높은 혼합가스를 사용한 냉각공정에는 안전성에 문제가 있을 수 있다.However, when the mixed gas with increased hydrogen content is used, the target cooling amount can be sufficiently achieved even at a low flow rate, but the vibration of the steel sheet can be reduced, but as the hydrogen content in the mixed gas increases, the risk of explosion increases. Therefore, the cooling process using a mixed gas having a high hydrogen content may have a safety problem.
이와 같이 냉각가스의 분사속도가 높을 때는 강판의 진동이 발생하여 에어나이프(4)에서 도금두께를 정밀하게 제어하지 못하는 문제가 있으며, 분사속도를 낮추기 위해 사용되는 종래기술들도 상기한 여러 가지 문제점을 가지고 있다.As such, when the injection speed of the cooling gas is high, there is a problem in that the vibration of the steel sheet causes the plated thickness to not be precisely controlled in the air knife 4, and the conventional techniques used to lower the injection speed also have various problems described above. Have
상기와 같은 문제점을 해결하기 위하여, 본 발명은 상온의 분사가스 대신 저온의 분사가스를 사용함으로써 강판의 냉각시 낮은 분사속도로도 충분히 소기의 냉각목표량을 달성하고, 높은 충돌압으로 인한 도금강판의 진동문제를 해결하여 양질의 도금강판을 생산할 수 있는 냉각능이 향상된 용융아연도금강판의 냉각장치를 제공하는데 그 목적이 있다.In order to solve the above problems, the present invention by using a low-temperature injection gas instead of the injection gas at room temperature to achieve the desired cooling target sufficiently even at a low injection rate when cooling the steel plate, due to the high impact pressure of the plated steel sheet The purpose of the present invention is to provide a cooling apparatus of a hot-dip galvanized steel sheet with improved cooling ability to produce a high quality plated steel sheet by solving the vibration problem.
도 1은 연속용융도금라인의 도금공정을 도시한 개략도;1 is a schematic diagram showing a plating process of a continuous hot dip plating line;
도 2는 종래의 가스제트냉각장치 개략도Figure 2 is a schematic view of a conventional gas jet cooling device
도 3은 본 발명에 따른 냉각능이 향상된 용융아연도금강판의 냉각장치의 구성도;3 is a configuration of the cooling apparatus of the hot-dip galvanized steel sheet with improved cooling capacity according to the present invention;
도 4는 본 발명에 따른 냉각능이 향상된 용융아연도금강판의 냉각장치에 의하여 소비된 가스유량 감소율을 도시한 그래프도이다.Figure 4 is a graph showing the gas flow rate reduction rate consumed by the cooling apparatus of the hot-dip galvanized steel sheet with improved cooling capacity according to the present invention.
♣도면의 주요부분에 대한 부호의 설명♣♣ Explanation of symbols for main part of drawing ♣
1:스나우트 2:싱크 롤 3:도금욕조 4:에어나이프1: Snout 2: Sink roll 3: Plating bath 4: Air knife
5,6:GA 합금화로 7:도금강판 11:냉각대 21:열교환기5,6: GA alloy furnace 7: plated steel sheet 11: cooling zone 21: heat exchanger
31:송풍기 41:가스압축기 51:가스팽창기31: blower 41: gas compressor 51: gas expander
상기한 목적을 달성하기 위하여, 본 발명은 연속용융도금라인의 도금강판을 냉각하기 위하여 상하면이 개방되어 강판이 통판되는 냉각대에 설치되는 냉각장치에 있어서, 상기 냉각대의 양측면 또는 일측면으로부터 기사용된 냉각용 가스를 취입하는 흡기관에 연결되어 취입된 가스를 특정 압력까지 압축시키는 가스압축기와;상기 가스압축기에 의하여 압축된 가스를 특정 온도까지 냉각시키기 위한 열교환기와; 상기 열교환기로부터 냉각된 압축가스를 팽창시켜 저온가스를 발생시켜 냉각대로 공급하는 가스팽창기로 구성되는 것을 특징으로 하는 냉각능이 향상된 용융아연도금강판의 냉각장치를 제공한다.In order to achieve the above object, the present invention is a cooling device which is installed in the cooling zone in which the upper and lower surfaces are opened to cool the plated steel sheet of the continuous hot-dip plating line, the steel sheet is passed through, for use from both sides or one side of the cooling stand A gas compressor connected to an intake pipe for injecting the cooling gas, and compressing the blown gas to a specific pressure; a heat exchanger for cooling the gas compressed by the gas compressor to a specific temperature; It provides a cooling apparatus of the hot-dip galvanized steel sheet with improved cooling capacity, characterized by consisting of a gas expander for expanding the compressed gas cooled from the heat exchanger to generate a low-temperature gas and supply it to the cooling zone.
또한, 본 발명은 상기 가스압축기가 취입된 가스를 5~10 Bar 범위의 압력으로 압축하는 것을 특징으로 하는 냉각능이 향상된 용융아연도금강판의 냉각장치를 제공한다.In another aspect, the present invention provides a cooling device of the hot-dip galvanized steel sheet with improved cooling capacity, characterized in that the gas compressor is compressed to a pressure in the range of 5 ~ 10 Bar.
이하, 첨부된 도면을 참조하여 본 발명의 구성 및 작용을 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the present invention.
도 3은 본 발명에 따른 냉각능이 향상된 용융아연도금강판의 냉각장치의 구성도이다.3 is a block diagram of a cooling apparatus of a hot-dip galvanized steel sheet with improved cooling capacity according to the present invention.
본 발명에 의한 가스젯 냉각기(Gas Jet Cooler)는 저온의 가스를 이용하여 도금강판(7)과 가스 사이의 냉각능력을 극대화할 수 있도록 구현한 것으로서, 도 3에 도시된 바와 같이, 냉각존 내의 기사용된 가스를 취입하여 가스압축기(41)에 의해 압축된 후, 냉각수를 냉매로 사용하는 열교환기(21)를 거쳐 상온 상태에서 가스팽창기(51)로 보내지고,Gas jet cooler according to the present invention is implemented to maximize the cooling capacity between the plated steel sheet 7 and the gas using a low temperature gas, as shown in Figure 3, in the cooling zone After the blown gas is blown and compressed by the gas compressor 41, it is sent to the gas expander 51 at room temperature through a heat exchanger 21 using cooling water as a refrigerant.
상기 가스팽창기(51)에서 가스가 단열 팽창함에 따라 발생된 저온가스를 강판에 분사하는 구조로 되어 있다.The gas expander 51 has a structure injecting the low-temperature gas generated by the adiabatic expansion of the gas to the steel sheet.
여기서, 가스배관(9a, 9b) 내에서 고압의 압축가스 유동으로 인해 압력 전달이 불규칙할 경우 필요에 따라 압력을 일정하게 유지시켜 주는 압력제어기(Pressure Regulator; 10)를 설치할 수도 있다.Here, a pressure regulator 10 may be installed to maintain a constant pressure as necessary when the pressure transmission is irregular due to the high pressure compressed gas flow in the gas pipes 9a and 9b.
상기와 같이 구성된 본 발명은 상용 CGL에서 측정된 가스젯 냉각기(Gas Jet Cooler)의 가스유량과 도금강판(7)의 온도를 본 발명에 적용한 경우와 비교 설명한다.The present invention configured as described above will be compared with the case where the gas flow rate and the temperature of the plated steel sheet 7 of the gas jet cooler (Gas Jet Cooler) measured in commercial CGL are applied to the present invention.
도 4는 본 발명에 따른 냉각능이 향상된 용융아연도금강판의 냉각장치에 의하여 소비된 가스유량 감소율을 도시한 그래프도이다.Figure 4 is a graph showing the gas flow rate reduction rate consumed by the cooling apparatus of the hot-dip galvanized steel sheet with improved cooling capacity according to the present invention.
상용 CGL에서 강판의 두께가 0.7㎜이고, 통판속도가 120mpm, 가스젯 냉각장치에 의한 냉각대(11)의 길이가 6m 일 때, 가스젯 냉각장치의 가스분사노즐은 40℃/Sec의 냉각속도를 나타내었다.In commercial CGL, when the thickness of the steel plate is 0.7 mm, the sheet speed is 120 mpm, and the length of the cooling table 11 by the gas jet cooling device is 6 m, the gas jet nozzle of the gas jet cooling device has a cooling speed of 40 ° C / Sec. Indicated.
동일한 설비조건에서 30℃에서 5Bar로 압축된 가스를 도금강판(7)에 분사할 경우 통상 노즐에서 분사된 가스의 압력은 대기압으로 회복되므로 단열 팽창기(51) 출구에서 가스의 온도는 -82℃가 된다.When spraying the gas compressed to 5Bar at 30 ℃ to the plated steel sheet 7 under the same equipment conditions, the pressure of the gas injected from the nozzle is restored to atmospheric pressure, so the temperature of the gas at the outlet of the adiabatic expander 51 is -82 ℃. do.
이 저온가스를 냉각용 가스로 사용하면 냉각속도는 52℃/Sec로 약 31%의 냉각속도가 증가되는 것으로 나타났다.When the low-temperature gas is used as the cooling gas, the cooling rate is 52 ° C / Sec, and the cooling rate is increased by about 31%.
이에 따른 냉각존에서 압축기로 취입되는 가스의 온도는 -38℃, 압축기(41) 출구에서의 가스 온도는 99℃이다.The temperature of the gas blown into the compressor in the cooling zone according to this is -38 ℃, the gas temperature at the outlet of the compressor 41 is 99 ℃.
본 발명에 따른 가스젯 냉각장치가 적용된 냉각대(11)의 냉각속도는 가스압축기 출구에서의 압력에 따라 달라지며, 도 4에 보인 바와 같이 압력에 따라 로그함수적인 분포를 보인다.The cooling rate of the cooling table 11 to which the gas jet cooling apparatus according to the present invention is applied varies depending on the pressure at the outlet of the gas compressor, and as shown in FIG.
즉, 상대적으로 저압에서는 냉각효율이 급격히 증가하지만, 고압에서는 압력에 따른 냉각효율의 증가가 거의 없다.That is, the cooling efficiency increases rapidly at a relatively low pressure, but there is little increase in the cooling efficiency at the high pressure.
이에 따라 냉각시스템의 경제성 및 효율을 고려할 때 5~10Bar의 압력범위에서 본 발명의 가스젯 냉각장치를 냉각대(11)에 적용하는 것이 가장 효율적임을 알 수 있었다.Accordingly, in consideration of the economics and the efficiency of the cooling system, it was found that it is most efficient to apply the gas jet cooling apparatus of the present invention to the cooling stage 11 in the pressure range of 5 to 10 Bar.
상술한 바와 같이, 본 발명은 가스 압축기 및 냉각기, 팽창기를 통하여 냉각분사되는 저온가스를 강판을 냉각매체로 사용함으로써 냉각능력을 증가시키고, 보다 적은 가스 유량으로 목표 냉각량을 달성할 수 있어, 분사가스의 충돌압으로 인한 강판의 진동을 감소시켜 용융아연도금강판의 품질을 향상시키는 효과가 있다.As described above, the present invention can increase the cooling capacity by using the steel sheet as the cooling medium by using the low temperature gas that is cooled and injected through the gas compressor, the cooler and the expander, and achieve the target cooling amount at a lower gas flow rate, By reducing the vibration of the steel sheet due to the collision pressure of the gas has an effect of improving the quality of the hot-dip galvanized steel sheet.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100950859B1 (en) * | 2009-10-20 | 2010-03-31 | 현대하이스코 주식회사 | Waste heat absorber system of cold roll steel manufacturing equipment |
| KR101988751B1 (en) | 2017-12-07 | 2019-06-12 | 주식회사 포스코 | Cooling apparatus for steel sheet |
| KR20190077908A (en) | 2017-12-26 | 2019-07-04 | 주식회사 포스코 | Cooling apparatus for steel sheet |
| KR20200069681A (en) | 2018-12-07 | 2020-06-17 | 주식회사 포스코 | Cooling apparatus for steel sheet |
| KR20220003866A (en) | 2020-07-02 | 2022-01-11 | 허기복 | Rapid cooling device of zinc plated steel plates |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW404982B (en) | 1997-03-14 | 2000-09-11 | Nippon Steel Corp | A heat treatment apparatus for a steel sheet by a gas jet system |
| JP2000257968A (en) * | 1999-03-05 | 2000-09-22 | Daikin Ind Ltd | Air conditioner |
| KR100504371B1 (en) * | 2000-12-28 | 2005-07-28 | 주식회사 포스코 | Apparatus for controlling the temperature of the strip cooling air |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100950859B1 (en) * | 2009-10-20 | 2010-03-31 | 현대하이스코 주식회사 | Waste heat absorber system of cold roll steel manufacturing equipment |
| KR101988751B1 (en) | 2017-12-07 | 2019-06-12 | 주식회사 포스코 | Cooling apparatus for steel sheet |
| KR20190077908A (en) | 2017-12-26 | 2019-07-04 | 주식회사 포스코 | Cooling apparatus for steel sheet |
| KR20200069681A (en) | 2018-12-07 | 2020-06-17 | 주식회사 포스코 | Cooling apparatus for steel sheet |
| KR20220003866A (en) | 2020-07-02 | 2022-01-11 | 허기복 | Rapid cooling device of zinc plated steel plates |
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