KR101160034B1 - apparatus for prevention of scale and removing it in cooling water pipe of hot rolling process - Google Patents

apparatus for prevention of scale and removing it in cooling water pipe of hot rolling process Download PDF

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KR101160034B1
KR101160034B1 KR1020090068097A KR20090068097A KR101160034B1 KR 101160034 B1 KR101160034 B1 KR 101160034B1 KR 1020090068097 A KR1020090068097 A KR 1020090068097A KR 20090068097 A KR20090068097 A KR 20090068097A KR 101160034 B1 KR101160034 B1 KR 101160034B1
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South Korea
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cooling water
coolant
scale
electronic control
pipe
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KR1020090068097A
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Korean (ko)
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KR20110010498A (en
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이동규
황진동
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현대제철 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0287—Cleaning devices removing solid particles, e.g. dust, rust
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

본 발명은 열간압연공정 냉각수관의 스케일 발생 방지 및 제거장치에 관한 것으로, 냉각수헤더(20)의 저면에 드레인관(40)이 설치되고, 상기 드레인관(40)에 전자제어밸브(50)가 설치되며, 상기 전자제어밸브(50)는 전자제어유니트(100)에 의해 냉각수펌프(10)와 반대로 작동 제어된다.The present invention relates to an apparatus for preventing and removing scale from a hot rolling process cooling water pipe. A drain pipe (40) is installed on a bottom surface of the cooling water header (20), and an electronic control valve (50) is provided on the drain pipe (40). It is installed, the electronic control valve 50 is operated by the electronic control unit 100 in the opposite direction to the cooling water pump (10).

따라서, 냉각수 분사가 이루어지지 않을 때 냉각수헤더(20) 하부의 잔여 냉각수까지 모두 배출될 수 있게 됨으로써 잔여냉각수가 증발하여 발생한 수증기에 의해 스케일 발생이 촉진되는 현상이 억제된다.Therefore, when the cooling water is not injected, all of the remaining cooling water under the cooling water header 20 can be discharged, thereby suppressing the phenomenon that scale generation is promoted by the steam generated by evaporation of the remaining cooling water.

또한, 이젝터(60)를 설치하여 상기 냉각수헤더(20) 뿐만 아니라 그에 연결된 냉각수관(15) 내부면에 묻어 있는 수분까지 모두 흡입 및 증발시켜 제거할 수 있게 됨으로써 관로내 스케일 발생을 최소화 할 수 있다.In addition, by installing the ejector 60, it is possible to minimize the generation of scale in the pipeline by being able to remove and remove all of the moisture on the inner surface of the coolant pipe 15 connected thereto as well as the coolant header 20. .

따라서, 스케일 발생이 감소하여 스케일에 의해 분사노즐(30)이 막히는 현상이 감소되며, 이에 압연롤과 스트립을 원활하게 냉각할 수 있게 된다.Therefore, the generation of scale is reduced, the phenomenon that the injection nozzle 30 is clogged by the scale is reduced, thereby smoothly cooling the roll and strip.

압연롤 냉각장치, 열간압연 냉각수 공급, 분사노즐 막힘 방지 Rolling roll cooling device, hot rolled coolant supply, spray nozzle prevention

Description

열간압연공정 냉각수관의 스케일 발생 방지 및 제거장치{apparatus for prevention of scale and removing it in cooling water pipe of hot rolling process}Apparatus for prevention of scale and removing it in cooling water pipe of hot rolling process}

본 발명은 열간압연공정에서 이용되는 냉각수 분사장치의 냉각수관 내에서 스케일이 발생되는 것을 방지하고, 또한 상기 냉각수를 분사하는 분사노즐에 끼인 스케일을 제거할 수 있도록 된 열간압연공정 냉각수관의 스케일 발생 방지 및 제거장치에 관한 것이다.The present invention prevents the scale from being generated in the cooling water pipe of the cooling water injector used in the hot rolling process, and also generates the scale of the hot rolling process cooling water pipe to remove the scale caught in the injection nozzle for spraying the cooling water. It relates to a prevention and removal device.

열간압연공정중 압연롤은 소재와 직접 접촉하여 높은 압력과 온도에서 판재를 생산한다. 따라서 롤의 표면 상태는 제품의 품질에 직접적인 영향을 미치는 중요한 요소이다.In the hot rolling process, the rolling rolls are in direct contact with the material to produce the sheet at high pressure and temperature. Therefore, the surface condition of the roll is an important factor that directly affects the quality of the product.

따라서, 냉각수펌프, 냉각수펌프에 연결된 냉각수관, 냉각수관의 단부에 구비된 냉각수헤더, 냉각수헤더에 다수 장착된 분사노즐 등으로 이루어진 냉각수 분사장치를 설치하여, 각 압연롤의 표면에 냉각수를 분사함으로써 적정 온도를 유지시켜 과열로 인한 롤의 표면 손상을 방지하고 있다.Therefore, by installing a cooling water injector consisting of a cooling water pump, a cooling water pipe connected to the cooling water pump, a cooling water header provided at the end of the cooling water pipe, a spray nozzle mounted on the cooling water header, and spraying the cooling water on the surface of each rolling roll. Maintaining the proper temperature prevents surface damage of the roll due to overheating.

또한, 압연되는 소재 자체의 표면 냉각 상태 역시 완성 제품의 품질에 매우 중요한 요소로서 각 압연 스탠드 사이에도 상기와 같은 냉각수 분사장치를 설치하여 제품의 표면 전체에 직접 냉각수를 분사해줌으로써 균일냉각을 도모하여 목적한 바의 품질을 확보할 수 있도록 하고 있다.In addition, the surface cooling state of the rolled material itself is also a very important factor for the quality of the finished product. The cooling water injector as described above is installed between each rolling stand to inject the coolant directly onto the entire surface of the product to achieve uniform cooling. To ensure the quality of the intended purpose.

한편, 상기 냉각수 분사시에는 냉각수관과 냉각수헤더의 내부에 냉각수가 완전히 충만된 상태에서 냉각수펌프에 의한 가압력에 의해 상기 분사노즐을 통해 냉각수가 분사된다.On the other hand, during the coolant injection, the coolant is injected through the injection nozzle by the pressing force by the coolant pump while the coolant is completely filled in the coolant pipe and the coolant header.

그리고 냉각수를 분사하지 않을 때는 상기 냉각수펌프의 작동이 정지되고 냉각수관과 냉각수헤더 내의 냉각수가 상기 분사노즐(개폐수단이 구비되지 않은 단순개방형 노즐공을 갖춘 타입)을 통해 배수된다.When the coolant is not injected, the operation of the coolant pump is stopped, and the coolant in the coolant pipe and the coolant header is drained through the spray nozzle (a type having a simple open nozzle hole having no opening and closing means).

그런데, 상기 냉각수헤더는 원통 형상으로 이루어져 있고, 상기 분사노즐은 그 원통 형상의 중심부 측부에 설치되어 있기 때문에 냉각수헤더 내의 중간 이하 부분에 있는 냉각수는 배출되지 못하고 고여 있게 된다.However, since the coolant header has a cylindrical shape, and the injection nozzle is installed at the central side of the cylindrical shape, the coolant in the middle or lower portion of the coolant header is not discharged and remains.

더구나, 스트립으로부터 고온의 열이 전달되므로 상기 잔존 냉각수가 일부 증발되어 냉각수헤더와 이에 연결된 냉각수관의 내부에 수증기가 충만하게 되는데, 이에 따라 냉각수관 내부의 스케일 발생이 촉진된다.In addition, the high temperature heat is transferred from the strip, so that the remaining cooling water is partially evaporated to fill the water inside the cooling water header and the cooling water pipe connected thereto, thereby facilitating the generation of scale inside the cooling water pipe.

한편, 냉각수헤더에는 다수의 분사노즐이 장착되는데, 중간 부분에 장착된 분사노즐의 분사공 직경이 가장 크고 양쪽 외측으로 갈수록 분사공의 직경이 작아진다.On the other hand, the cooling water header is equipped with a plurality of injection nozzles, the diameter of the injection hole of the injection nozzle mounted in the middle portion is the largest and the diameter of the injection hole is reduced toward both sides.

그런데, 상기와 같이 관내에서 발생된 스케일이 냉각수 분사시 이동하여 작은 직경의 분사공에 끼이게 되므로 주로 냉각수헤더의 좌우측 분사노즐에서 정상적 인 냉각수 분사가 이루어지지 않게 되며, 이로써 스트립의 균일 냉각을 방해하는 문제점이 있었다.However, since the scale generated in the pipe is moved during the cooling water injection and is caught in the small diameter injection hole, the normal cooling water injection is not normally performed at the left and right injection nozzles of the cooling water header, thereby preventing uniform cooling of the strip. There was a problem.

그러나, 종래의 냉각수 분사장치에는 상기와 같이 냉각수헤더 하부의 잔여 냉각수를 배출하기 위한 장치 및 스케일에 의해 막힌 노즐공을 뚫어주는 장치가 구비되어 있지 않아, 여전히 다량의 스케일이 발생되고, 그로 인해 반복적으로 좌우측 분사노즐이 막히게 되는 문제점이 있었다.However, the conventional cooling water injection device is not provided with a device for discharging the remaining cooling water in the lower portion of the cooling water header as described above and a device for drilling the nozzle hole blocked by the scale, so that a large amount of scale is still generated, thereby causing repetitive There was a problem that the left and right injection nozzles are blocked.

또한, 상기 냉각수헤더의 하부에 고여 있는 잔여냉각수 이외에도 냉각수관의 내부면에 묻어 있는 수분이 스케일 발생의 주요 원인인데 분사장치의 비작동시 냉각수관으로부터 냉각수가 배출된다 하여도 냉각수관 내부면에 여전히 다량의 수분이 남아 있으므로 스케일 발생이 활성화되는 문제점이 있었다.In addition to the remaining coolant accumulated in the lower part of the coolant header, moisture on the inner surface of the coolant pipe is the main cause of scale generation. Since a large amount of moisture remains, there was a problem that the scale generation is activated.

이에 본 발명은 상기와 같은 문제점을 해결하기 위해 안출된 것으로, 냉각수헤더 내의 냉각수를 완전히 배출시킴으로써 잔여 냉각수가 증발되어 생성된 수증기에 의해 스케일 발생이 촉진되는 것을 방지하고, 냉각수관의 내부면에 묻어 있는 수분까지도 제거할 수 있게 되어 스케일 발생을 최소화하며, 분사노즐의 분사공에 스케일이 끼인 경우에는 상기 스케일을 강제로 제거할 수 있게 됨으로써 정상적인 냉각수 분사가 가능하도록 된 열간압연공정 냉각수관의 스케일 발생 방지 및 제거장치를 제공함에 그 목적이 있다.Accordingly, the present invention has been made to solve the above problems, by completely discharging the cooling water in the cooling water header to prevent the generation of scale by the steam generated by the remaining cooling water evaporated, buried in the inner surface of the cooling water pipe It is possible to remove even moisture, which minimizes the generation of scale, and if the scale is stuck in the injection hole of the injection nozzle, the scale can be forcibly removed to enable normal cooling water injection. Its purpose is to provide a prevention and removal device.

상기와 같은 목적을 달성하기 위한 본 발명은,The present invention for achieving the above object,

냉각수펌프에 냉각수관이 연결되고, 상기 냉각수관의 단부에 냉각수헤더가 구비되며, 상기 냉각수헤더에 다수의 분사노즐이 장착되어 압연롤 및 스트립에 냉각수를 분사하는 열간압연공정의 냉각수 분사장치에 있어서,In a cooling water injector of a hot rolling process, a cooling water pipe is connected to a cooling water pump, a cooling water header is provided at an end of the cooling water pipe, and a plurality of injection nozzles are mounted on the cooling water header to spray cooling water to a rolling roll and a strip. ,

상기 냉각수헤더의 저면에 설치된 드레인관과, 상기 드레인관에 설치된 전자제어밸브와, 상기 전자제어밸브와 상기 냉각수펌프의 작동을 제어하는 전자제어유니트를 더 포함하는 것을 특징으로 한다.And a drain pipe provided on a bottom surface of the coolant header, an electronic control valve provided on the drain pipe, and an electronic control unit controlling the operation of the electronic control valve and the coolant pump.

또한, 상기 전자제어유니트는 상기 냉각수펌프가 ON일 때 상기 전자제어밸브를 OFF시키고, 상기 냉각수펌프가 OFF일때 상기 전자제어밸브를 ON시킨다.The electronic control unit turns off the electronic control valve when the coolant pump is ON, and turns on the electronic control valve when the coolant pump is OFF.

또한, 상기 드레인관의 배출구에 이젝터가 장착되고, 상기 이젝터에 고압의 압축공기를 공급하는 에어컴프레서가 연결된 것을 특징으로 한다.In addition, the ejector is mounted to the discharge port of the drain pipe, it characterized in that the air compressor for supplying high-pressure compressed air to the ejector.

또한, 상기 에어컴프레서는 상기 전자제어유니트에 의해, 상기 냉각수펌프가 ON일때 OFF되고 상기 냉각수펌프가 OFF일때 ON되는 상태로 작동 제어된다.In addition, the air compressor is operated and controlled by the electronic control unit in a state where the coolant pump is turned off when the coolant pump is turned on and turned on when the coolant pump is turned off.

이상 설명한 바와 같은 구성의 본 발명에 따르면, 냉각수 분사장치가 작동하지 않을 때 냉각수관 뿐만 아니라 냉각수헤더 하부에 고여 있는 잔여 냉각수까지 모두 배출할 수 있게 된다.According to the present invention having the configuration as described above, it is possible to discharge not only the coolant pipe but also the remaining coolant accumulated in the coolant header when the coolant injector is not operated.

따라서, 상기 잔여 냉각수의 증발로 인한 수증기 발생이 이루어지지 않으므로 냉각수관 내에 수증기가 차지 않게 되며, 이에 수증기에 의한 스케일 생성 촉진 현상을 억제하여 스케일 발생을 최소화할 수 있게 된다.Therefore, since no steam is generated due to the evaporation of the remaining cooling water, water vapor is not charged in the cooling water pipe, thereby minimizing scale generation by suppressing the promotion of scale generation by water vapor.

또한, 상기 냉각수관의 내부면에 묻어 있는 수분도 이젝터의 공기 흡입 작용시 모두 흡입되거나 증발되어 제거됨으로써 냉각수관의 스케일 발생을 최소한도로 억제할 수 있게 된다.In addition, the moisture on the inner surface of the cooling water pipe is also sucked or evaporated and removed during the action of the air suction of the ejector, it is possible to minimize the scale generation of the cooling water pipe.

상기와 같이 스케일 발생이 최소화되므로 스케일이 분사노즐의 분사공에 끼여 분사노즐의 냉각수 분사 작용을 방해하는 현상이 잘 일어나지 않게 된다.As the occurrence of scale is minimized as described above, the phenomenon that the scale is caught in the injection hole of the injection nozzle, hinders the cooling water injection action of the injection nozzle.

그러나 부유 스케일이 상기 분사노즐의 분사공에 끼인 경우라도, 냉각수펌프 정지시 상기 이젝터에서 발생하는 진공흡입력에 의해 상기 분사공으로부터 스케일이 제거됨으로써 이후의 냉각수펌프 작동시에는 분사노즐이 정상적으로 냉각수를 분사할 수 있게 된다.However, even when the floating scale is caught in the injection hole of the injection nozzle, the scale is removed from the injection hole by the vacuum suction input generated by the ejector when the cooling water pump is stopped, and the spray nozzle normally ejects the cooling water during the subsequent operation of the cooling water pump. You can do it.

따라서, 압연롤에 충분한 냉각수가 분사되어 과열로 인한 변형과 편마모 및 국부적 표면손상이 방지됨으로써 압연롤의 내구 수명이 증대될 뿐만 아니라 제품의 손상이 방지된다.Therefore, sufficient cooling water is injected to the rolling rolls to prevent deformation, uneven wear and local surface damage due to overheating, thereby increasing the durability life of the rolling rolls and preventing damage to the product.

또한, 스트립 전체에 골고루 냉각수가 분사되어 균일 냉각이 가능해짐으로써 목적한 바의 표면 품질을 확보할 수 있다.In addition, the cooling water is evenly sprayed on the entire strip to allow uniform cooling, thereby ensuring the desired surface quality.

이하, 본 발명을 첨부된 예시도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

도 1은 본 발명에 따른 열간압연공정 냉각수관의 스케일 발생 방지 및 제거장치의 개략구성도이다.1 is a schematic configuration diagram of an apparatus for preventing and removing scale from a hot rolling process cooling water pipe according to the present invention.

도시된 바와 같이 냉각수헤더(20)는 원통형 단면을 가지고 있으며, 냉각수펌프(10)와 냉각수관(15)으로 연결되어 있다.As shown, the coolant header 20 has a cylindrical cross section and is connected to the coolant pump 10 and the coolant pipe 15.

또한, 상기 냉각수헤더(20)의 중간부 측면에는 목적하는 위치로 냉각수를 분사할 수 있도록 그에 알맞은 각도로 경사진 상태로 분사노즐(30)이 설치된다.In addition, the injection nozzle 30 is installed on the middle side of the coolant header 20 in a state inclined at a suitable angle so as to spray the coolant to a desired position.

따라서, 상기 냉각수펌프(10)의 작동이 정지되었을 때 냉각수헤더(20)의 분사노즐(30) 하부 공간의 냉각수는 분사노즐(30)을 통해 배출되지 못하고 냉각수헤더(20) 내에 남게 되는 것이다.Therefore, when the operation of the coolant pump 10 is stopped, the coolant in the lower space of the injection nozzle 30 of the coolant header 20 is not discharged through the injection nozzle 30 and remains in the coolant header 20.

또한, 냉각수관(15)의 내부에도 관의 내부면에 여전히 수분이 묻어 있는 상태로서 이는 스케일 발생의 주 원인이다.In addition, the inside of the coolant pipe 15 is still in the state that the water is still on the inner surface of the tube, which is the main cause of scale generation.

본 발명은 상기 냉각수헤더(20)의 저면에 설치된 드레인관(40)과, 상기 드레인관(40)에 설치된 전자제어밸브(50)와, 상기 전자제어밸브(50)와 상기 냉각수펌프(10)의 작동을 제어하는 전자제어유니트(100)를 포함한다.The present invention is a drain pipe 40 provided on the bottom surface of the coolant header 20, an electronic control valve 50 provided in the drain pipe 40, the electronic control valve 50 and the coolant pump 10 It includes an electronic control unit 100 for controlling the operation of.

상기 드레인관(40)의 하단 즉, 배출구는 상기 냉각수헤더(20)에 연결된 상단보다 낮은 위치에 있어야만 하고, 상기 전자제어밸브(50)를 설치할 수 있는 길이를 가진다.The lower end of the drain pipe 40, that is, the discharge port should be at a position lower than the upper end connected to the coolant header 20, and has a length for installing the electronic control valve 50.

상기 전자제어밸브(50)는 다양한 종류의 것이 있을 수 있으나, 모두 전자제어유니트(100)로부터 제어신호를 받아 ON/OFF되도록 전류를 공급받았을 때 자화되는 전자석을 밸브 구동수단으로 갖추고 있다.The electronic control valve 50 may be of various kinds, but all have an electromagnet that is magnetized when the current is supplied to be turned on / off by receiving a control signal from the electronic control unit 100.

상기 전자제어유니트(100)는 상기 냉각수펌프(10)의 작동 여부에 따라서 상기 전자제어밸브(50)를 작동시킨다.The electronic control unit 100 operates the electronic control valve 50 depending on whether the coolant pump 10 is operated.

즉, 상기 전자제어유니트(100)는 상기 냉각수펌프(10)가 ON(작동)일 경우에는 전자제어밸브(50)를 OFF시켜서 드레인관(40)을 차단상태로 유지함으로써 냉각수펌프(10)로부터 압송된 냉각수가 분사노즐(30)을 통해 분사될 수 있도록 하고, 상기 냉각수펌프(10)가 OFF(정지)일 경우에는 전자제어밸브(50)를 ON시켜서 드레인관(40)을 개방함으로써 냉각수관(15) 및 냉각수헤더(20)의 냉각수가 모두 드레인관(40)을 통해 배출될 수 있도록 되어 있다. 이때 냉각수관(15) 및 냉각수헤더(20) 내부에 부유하던 스케일 입자도 냉각수와 함께 모두 외부로 배출된다.That is, when the cooling water pump 10 is ON (operation), the electronic control unit 100 turns off the electronic control valve 50 to keep the drain pipe 40 in a blocked state from the cooling water pump 10. The pumped coolant can be injected through the injection nozzle 30, and when the coolant pump 10 is OFF (stopped), the solenoid control valve 50 is turned on to open the drain pipe 40 to open the coolant pipe. Both the cooling water 15 and the cooling water header 20 can be discharged through the drain pipe 40. At this time, the scale particles suspended in the cooling water pipe 15 and the cooling water header 20 are also discharged to the outside together with the cooling water.

상기와 같이, 냉각수 분사가 이루어지지 않을 때 냉각수헤더(20)에 잔여 냉각수가 남아 있지 않게 됨으로써 냉각수 증발로 인한 다량의 수증기가 생성되지 않으며, 이에 따라 종래와 같이 수증기에 의한 스케일 생성 촉진 현상이 발생하지 않음으로써 스케일 발생량 자체가 크게 감소된다.As described above, since the remaining coolant does not remain in the coolant header 20 when the coolant injection is not performed, a large amount of water vapor is not generated due to the evaporation of the coolant, and thus, a phenomenon of promoting scale generation by water vapor occurs as in the prior art. By not doing so, the scale generation amount itself is greatly reduced.

따라서, 냉각수 분사시 냉각수관(15) 및 냉각수헤더(20) 내에 부유하는 스케 일이 거의 없음으로써 스케일 끼임에 의한 분사노즐(30)의 분사공 막힘 현상도 거의 발생하지 않게 된다.Therefore, since there is almost no scale floating in the cooling water pipe 15 and the cooling water header 20 during the cooling water injection, clogging of the injection hole of the injection nozzle 30 due to the scale is hardly generated.

도 2는 본 발명에 따른 열간압연공정 냉각수관의 스케일 발생 방지 및 제거장치의 또 다른 실시예이다.Figure 2 is another embodiment of the scale generation prevention and removal device of the hot rolling process cooling water pipe according to the present invention.

도시된 바와 같이, 도 2에 도시된 실시예는 상기 도 1의 실시예에 있어서, 상기 드레인관(40)의 배출구에 장착된 이젝터(60)와, 상기 이젝터(60)에 고압의 압축공기를 공급하는 에어컴프레서(90)를 더 포함한다.As shown in FIG. 2, in the embodiment of FIG. 1, the ejector 60 mounted at the outlet of the drain pipe 40 and the compressed air at high pressure in the ejector 60 are shown. It further includes an air compressor 90 to supply.

상기 에어컴프레서(90)는 상기 전자제어유니트(100)에 의해 작동 제어되는데, 상기 전자제어밸브(50)의 작동 제어와 동일한 방식으로 제어된다.The air compressor (90) is operated and controlled by the electronic control unit (100), which is controlled in the same manner as the operational control of the electronic control valve (50).

즉, 상기 냉각수펌프(10)가 ON일 때는 OFF(정지)로 제어되고, 냉각수펌프(10)가 OFF일 때는 ON(작동)으로 제어된다.That is, it is controlled to OFF (stop) when the coolant pump 10 is ON, and is controlled to ON (operation) when the coolant pump 10 is OFF.

상기 이젝터(60)는 도 3에 도시된 바와 같이, 디퓨져 형상의 출구(61b)를 갖는 바디(61)와, 상기 바디(61)의 입구(61a) 내측에 설치된 노즐(62)로 이루어지며, 상기 노즐(62)의 앞쪽으로 흡입구(61c)가 형성된다.As shown in FIG. 3, the ejector 60 includes a body 61 having a diffuser-shaped outlet 61b and a nozzle 62 installed inside the inlet 61a of the body 61. A suction port 61c is formed in front of the nozzle 62.

그리고, 상기 흡입구(61c)는 흡입하고자 하는 물질(가스)이 있는 공간(C)에 연결된다.In addition, the suction port 61c is connected to a space C in which a substance (gas) to be sucked is located.

따라서, 상기 바디(61)의 입구(61a)로 압축공기를 공급하면 노즐(62)을 통과하면서 가속되어 바디(61a)의 출구(61b)를 통해 고속으로 빠져나가고, 이때 노즐(62)과 출구(61b) 사이에 부압이 발생하여 흡입구(61c)를 통해 상기 공간(C)의 물질이 흡입된다.Therefore, when compressed air is supplied to the inlet 61a of the body 61, it is accelerated while passing through the nozzle 62 and exits at a high speed through the outlet 61b of the body 61a. At this time, the nozzle 62 and the outlet A negative pressure is generated between the 61b and the substance of the space C is sucked through the suction port 61c.

본 발명은 상기 이젝터(60)의 흡입구(61c)에 드레인관(40)의 배출구를 연결하고, 입구(61a)에 에어공급관(70)을 매개로 상기 에어컴프레서(90)를 연결하며, 상기 출구(61b)에 배출관(80)을 연결한 것이다.The present invention connects the outlet of the drain pipe 40 to the inlet 61c of the ejector 60, and connects the air compressor 90 to the inlet 61a via the air supply pipe 70, the outlet The discharge pipe 80 is connected to 61b.

따라서, 상기 냉각수펌프(10)가 OFF되고 상기 전자제어밸브(50)가 ON되어 냉각수관(15)과 냉각수헤더(20)의 냉각수가 상기 드레인관(40)을 통해 배출될 때, 상기 에어컴프레서(90)가 ON되어 고압의 압축공기가 에어공급관(70)을 통해 상기 이젝터(60)로 공급된다.Therefore, when the coolant pump 10 is turned off and the electromagnetic control valve 50 is turned on to discharge the coolant of the coolant pipe 15 and the coolant header 20 through the drain pipe 40, the air compressor. 90 is turned on and the high pressure compressed air is supplied to the ejector 60 through the air supply pipe 70.

상기 압축공기는 노즐(62)을 통과하면서 노즐(62)과 출구(61b) 사이에 부압을 형성하고 이에 흡입구(61c)를 통해 드레인관(40)의 냉각수가 흡입되어 압축공기와 더불어 출구(61b)를 거쳐 배출관(80)으로 빠져나가게 된다.The compressed air forms a negative pressure between the nozzle 62 and the outlet 61b while passing through the nozzle 62, and the cooling water of the drain pipe 40 is sucked through the suction port 61c, and together with the compressed air, the outlet 61b. Through the outlet pipe (80).

따라서, 냉각수관(15)과 냉각수헤더(20) 내의 냉각수가 보다 신속하게 배출되며, 냉각수헤더(20) 내에 잔여 냉각수가 전혀 남지 않게 된다.Therefore, the coolant in the coolant pipe 15 and the coolant header 20 is discharged more quickly, and no remaining coolant remains in the coolant header 20.

즉, 이젝터(60)에 의해 형성된 진공압에 의해 상기 냉각수헤더(20) 내측 표면에 묻어 있는 수분까지 드레인관(40)을 통해 깨끗하게 흡입되어 배출됨으로써 잔여 냉각수 증발에 의한 수증기 생성과 그로 인한 배관 내 스케일 생성 촉진 현상이 최대로 억제된다.In other words, the moisture generated on the inner surface of the cooling water header 20 is sucked and discharged cleanly through the drain pipe 40 by the vacuum pressure formed by the ejector 60, thereby generating water vapor due to residual cooling water evaporation and consequently in the pipe. Scale generation promoting phenomenon is suppressed to the maximum.

또한, 상기 냉각수헤더(20)내에 묻어 있는 수분의 제거 현상과 동일하게 그에 연결된 냉각수관(15) 내부면에 묻어 있던 수분도 이젝터(60)에 의해 고속의 공기 유동이 발생하므로 상기 공기유동에 의해 흡입 및 증발되어 제거됨으로써 냉각수관(15) 내부면에서 스케일 발생을 최대한 억제할 수 있도록 되어 있다.In addition, the same as the removal of moisture in the cooling water header 20, the moisture contained in the inner surface of the cooling water pipe 15 connected thereto is also generated by the ejector 60, the high-speed air flow is generated by the air flow By suction and evaporation and removal, scale generation on the inner surface of the cooling water pipe 15 can be suppressed as much as possible.

따라서, 냉각수관(15)이나 냉각수헤더(20)에 존재하는 스케일의 양이 최소화되므로 냉각수내 부유 스케일의 양이 크게 감소되어 냉각수 분사시 부유 스케일이 분사노즐(30)의 분사공에 끼는 현상이 거의 발생하지 않게 된다.Therefore, since the amount of scale present in the coolant pipe 15 or the coolant header 20 is minimized, the amount of suspended scale in the coolant is greatly reduced, so that the floating scale is caught in the injection hole of the injection nozzle 30 when the coolant is sprayed. Rarely.

또한, 그러한 현상(스케일에 의한 분사노즐 막힘 현상)이 발생한 경우에도, 냉각수 분사가 정지되었을 때, 즉, 상기 냉각수헤더(20)내 냉각수가 배출될 때 상기 이젝터(60)에서 발생된 진공압에 의해 분사노즐(30)을 막고 있던 스케일이 흡입되어 분사공으로부터 제거됨으로써 분사노즐(30)은 이후, 다시 정상적으로 냉각수를 분사할 수 있게 된다.In addition, even when such a phenomenon occurs (a clogging of the injection nozzle due to the scale), the vacuum pressure generated by the ejector 60 when the cooling water injection is stopped, that is, when the cooling water in the cooling water header 20 is discharged. As a result, the scale blocking the injection nozzle 30 is sucked and removed from the injection hole, whereby the injection nozzle 30 can again inject cooling water normally.

상기와 같이 본 발명에 의하면 냉각수 분사장치가 작동하지 않을 때, 냉각수헤더(20)에 잔여 냉각수가 전혀 남지 않도록 냉각수를 배출할 수 있고, 동시에 분사노즐(30)의 노즐공에 끼인 스케일을 제거할 수 있게 된다.As described above, according to the present invention, when the cooling water injector is not operated, the cooling water can be discharged so that no remaining cooling water remains in the cooling water header 20, and at the same time, the scale caught in the nozzle hole of the injection nozzle 30 can be removed. It becomes possible.

도 1은 본 발명에 따른 열간압연공정 냉각수관의 스케일 발생 방지 및 제거장치의 개략구성도,1 is a schematic configuration diagram of an apparatus for preventing and removing scale from a hot rolling process cooling water pipe according to the present invention;

도 2는 본 발명에 따른 열간압연공정 냉각수관의 스케일 발생 방지 및 제거장치의 또 다른 실시예의 구성도,Figure 2 is a configuration diagram of another embodiment of the scale generation prevention and removal apparatus of the hot rolling process cooling water pipe according to the present invention,

도 3은 이젝터의 구성도이다.3 is a configuration diagram of the ejector.

*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

10 : 냉각수펌프 15 : 냉각수관10: cooling water pump 15: cooling water pipe

20 : 냉각수헤더 30 : 분사노즐20: coolant header 30: spray nozzle

40 : 드레인관 50 : 전자제어밸브40: drain pipe 50: electronic control valve

60 : 이젝터 61 : 바디60: ejector 61: body

61a : 입구 61b : 출구61a: entrance 61b: exit

61c : 흡입구 62 : 노즐61c: suction port 62: nozzle

70 : 에어공급관 80 : 배출관70: air supply pipe 80: discharge pipe

90 : 에어컴프레서 100 : 전자제어유니트90: air compressor 100: electronic control unit

Claims (4)

냉각수펌프에 냉각수관이 연결되고, 상기 냉각수관의 단부에 냉각수헤더가 구비되며, 상기 냉각수헤더에 다수의 분사노즐이 장착되어 압연롤 및 스트립에 냉각수를 분사하는 열간압연공정의 냉각수 분사장치에 있어서,In a cooling water injector of a hot rolling process, a cooling water pipe is connected to a cooling water pump, a cooling water header is provided at an end of the cooling water pipe, and a plurality of injection nozzles are mounted on the cooling water header to spray cooling water to a rolling roll and a strip. , 상기 냉각수헤더의 저면에 설치된 드레인관과, 상기 드레인관에 설치된 전자제어밸브와, 상기 전자제어밸브와 상기 냉각수펌프의 작동을 제어하는 전자제어유니트를 더 포함하고,A drain pipe provided on the bottom surface of the coolant header, an electronic control valve provided on the drain pipe, and an electronic control unit controlling the operation of the electronic control valve and the coolant pump, 상기 드레인관의 배출구에 이젝터가 장착되고, 상기 이젝터에 고압의 압축공기를 공급하는 에어컴프레서가 연결된 것을 특징으로 하는 열간압연공정 냉각수관의 스케일 발생 방지 및 제거장치.Ejector is mounted to the discharge port of the drain pipe, the air compressor for supplying high-pressure compressed air to the ejector is connected to the hot rolling process characterized in that the prevention and removal of the scale of the cooling water pipe. 청구항 1에 있어서,The method according to claim 1, 상기 전자제어유니트는 상기 냉각수펌프가 ON일 때 상기 전자제어밸브를 OFF시키고, 상기 냉각수펌프가 OFF일때 상기 전자제어밸브를 ON시키는 것을 특징으로 하는 열간압연공정 냉각수관의 스케일 발생 방지 및 제거장치.And the electronic control unit turns off the electronic control valve when the cooling water pump is ON and turns on the electronic control valve when the cooling water pump is OFF. 삭제delete 청구항 1에 있어서,The method according to claim 1, 상기 에어컴프레서는 상기 전자제어유니트에 의해, 상기 냉각수펌프가 ON일때 OFF되고 상기 냉각수펌프가 OFF일때 ON되는 상태로 작동 제어되는 것을 특징으로 하는 열간압연공정 냉각수관의 스케일 발생 방지 및 제거장치.And the air compressor is operated by the electronic control unit to be controlled when the coolant pump is turned off and to be turned on when the coolant pump is turned off.
KR1020090068097A 2009-07-24 2009-07-24 apparatus for prevention of scale and removing it in cooling water pipe of hot rolling process KR101160034B1 (en)

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CN103506386A (en) * 2012-06-20 2014-01-15 攀钢集团攀枝花钢钒有限公司 Hot rolling production line and roll cooling system thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58107043A (en) 1981-12-21 1983-06-25 Toshiba Corp Cooler for electrical machinery and apparatus
KR20020049699A (en) * 2000-12-20 2002-06-26 이구택 water cooling system of the hot steel plate at the guenching Line
KR20040089317A (en) * 2003-04-11 2004-10-21 주식회사 포스코 Cooling device for restraint sand-type scale
WO2008077449A1 (en) 2006-12-27 2008-07-03 Siemens Vai Metals Technologies Ltd. Apparatus and method for controlled cooling

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58107043A (en) 1981-12-21 1983-06-25 Toshiba Corp Cooler for electrical machinery and apparatus
KR20020049699A (en) * 2000-12-20 2002-06-26 이구택 water cooling system of the hot steel plate at the guenching Line
KR20040089317A (en) * 2003-04-11 2004-10-21 주식회사 포스코 Cooling device for restraint sand-type scale
WO2008077449A1 (en) 2006-12-27 2008-07-03 Siemens Vai Metals Technologies Ltd. Apparatus and method for controlled cooling

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