KR20100060917A - Device and method for preventing deadlock of nozzle during accelerated cooling of steel plate rolling process - Google Patents

Device and method for preventing deadlock of nozzle during accelerated cooling of steel plate rolling process Download PDF

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KR20100060917A
KR20100060917A KR1020080119720A KR20080119720A KR20100060917A KR 20100060917 A KR20100060917 A KR 20100060917A KR 1020080119720 A KR1020080119720 A KR 1020080119720A KR 20080119720 A KR20080119720 A KR 20080119720A KR 20100060917 A KR20100060917 A KR 20100060917A
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South Korea
Prior art keywords
cooler
accelerated
blade
nozzle
temperature
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KR1020080119720A
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Korean (ko)
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KR101060947B1 (en
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정영진
최석조
정원식
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주식회사 포스코
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B33/00—Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls for handling cobbles; Overload safety devices
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

PURPOSE: A device and a method for preventing blockage of a nozzle during accelerated cooling of a steel plate rolling process are provided to prevent the blockage of an upper nozzle of an accelerated cooler by restricting the temperature rise of the upper nozzle. CONSTITUTION: A device for preventing blockage of a nozzle during accelerated cooling of a steel plate rolling process comprises a thermoscope, slab detection sensors(100a,100b), and a controller(200). The thermoscope measures the inner temperature of an upper header of an accelerated cooler. The slab detection sensors sense a slab when the slab is inserted to or extracted from the accelerated cooler. The controller controls the flux of cooling water injected from the lower nozzle of a lower header of the accelerated cooler to the upper nozzle of an upper header.

Description

후판압연공정의 가속냉각시 노즐막힘 방지장치 및 방지방법{Device and method for preventing deadlock of nozzle during accelerated cooling of steel plate rolling process}Device and method for preventing deadlock of nozzle during accelerated cooling of steel plate rolling process

본 발명은 후판압연공정의 가속냉각시 노즐막힘 방지장치 및 방지방법에 관한 것으로, 특히 후판압연공정의 가속냉각시 강판의 균일냉각, 균일재질확보 및 강판의 판변형 최소화를 위해 가속냉각기에 구비된 노즐의 막힘을 방지하는 장치 및 방법에 관한 것이다.The present invention relates to an apparatus and a method for preventing nozzle clogging during accelerated cooling of a thick plate rolling process. In particular, the present invention relates to an accelerated cooler for uniform cooling, securing of uniform material, and minimizing sheet deformation of a steel sheet during accelerated cooling of a thick plate rolling process. An apparatus and method for preventing clogging of a nozzle are provided.

도 1은 종래의 후판압연공정의 개략도이다. 도 1에 도시된 바와 같이, 후판압연공정에서 날판(60)은 가열로(10), 조압연기/사상압연기(20), 가속냉각기(30), 핫 레벨러(hot leveler, 40), 냉각대(50)를 거치면서 생산이 된다.1 is a schematic diagram of a conventional thick plate rolling process. As shown in FIG. 1, in the thick plate rolling process, the blade plate 60 may include a heating furnace 10, a rough rolling mill / steam rolling mill 20, an accelerated cooler 30, a hot leveler 40, a cooling stand ( Production takes place through 50).

가속냉각기(30)의 사용여부에 따라 수냉재와 비수냉재로 분류된다. 이때, 수냉재의 균일한 온도제어를 통한 판변형 저감 및 재질불량 감소를 위하여 가속냉각기(30) 내부 노즐관리의 중요성이 크다.Depending on whether the accelerated cooler 30 is used, it is classified into a water coolant and a non-water coolant. At this time, in order to reduce the plate deformation and the material defects through the uniform temperature control of the water coolant, the importance of the nozzle management inside the accelerator cooler 30 is great.

도 2는 도 1의 가속냉각기의 상세도이다. 도 2에 도시된 바와 같이, 가속냉 각기(3)는 4~7개의 뱅크(30a, 30b, 30c, 30d)로 구성되며, 각 뱅크(30a, 30b, 30c, 30d)는 상부 및 하부에 각각 4~6개의 헤더(header, 31, 32)로 구성된다.2 is a detailed view of the accelerated cooler of FIG. As shown in FIG. 2, the accelerated cooler 3 is composed of four to seven banks 30a, 30b, 30c, and 30d, and each bank 30a, 30b, 30c, and 30d has a top and a bottom, respectively. It consists of four to six headers (31, 32).

도 3은 도 2의 상부헤더 내부의 상부노즐의 사시도이고, 도 4는 도 3의 상부노즐의 출구에 Ca 화합물이 형성된 상태의 사시도이다. 도 3에 도시된 바와 같이, 상부헤더(31)는 약 1000개의 노즐(31a)로 구성된다. 이때, 가속냉각기의 동작은 날판의 냉각여부(수냉재와 비수냉재)에 따라 달라진다.3 is a perspective view of an upper nozzle inside the upper header of FIG. 2, and FIG. 4 is a perspective view of a Ca compound formed at an outlet of the upper nozzle of FIG. 3. As shown in FIG. 3, the upper header 31 is composed of about 1000 nozzles 31a. At this time, the operation of the accelerated cooler depends on whether the blade is cooled (water and non-water coolant).

수냉재를 냉각할 때에는 날판에 헤더(31)를 근접(300~500mm)하게 하여 냉각을 실시하고, 비수냉재 작업시에는 날판으로부터 방사되는 방사열을 피하기 위하여 1000~1200mm로 헤더(31)를 들어올려 놓은 상태에서 생산한다.When the water coolant is cooled, the header 31 is cooled close to the blade (300 to 500 mm), and during non-water coolant work, the header 31 is lifted to 1000 to 1200 mm to avoid radiant heat radiated from the blade. Produced in a set state.

따라서, 가속냉각기 상부헤더의 상부노즐(31)은 그 구성성분의 이온화 차이, 및 가열과 냉각에 따라 상부노즐(31a)의 내부와 출구부위에서 막힘현상이 발생한다.Therefore, the upper nozzle 31 of the upper header of the accelerated cooler is clogged at the inside and the outlet of the upper nozzle 31a according to the ionization difference of its components, and heating and cooling.

이와 같은 상부노즐(31a)의 막힘현상을 방지하기 위해, 종래에는 주기적으로 상부노즐을 교환하거나 가속냉각시의 아이들 타임(idle time)동안 상부노즐(31a)을이용하여 고유량으로 냉각(top down cooling)을 실시함으로써, 상부노즐(31a)의 온도를 제어하고 상부노즐(31a)의 막힘을 방지하고자 하였다.In order to prevent such clogging of the upper nozzle 31a, conventionally, the upper nozzle is periodically replaced or cooled down to a high flow rate by using the upper nozzle 31a during an idle time during accelerated cooling. cooling) to control the temperature of the upper nozzle 31a and prevent clogging of the upper nozzle 31a.

그러나, 상부노즐(31a)을 사용할 경우에는 냉각종료 후에도 낙하 체류수가 남게 되므로, 이후에 소재가 진입할 때 온도편차문제를 유발하며, 도 4에 도시된 바와 같이, 상부노즐(31a)의 출구에 형성된 Ca 화합물을 제거하기 위해서도 효과적 이지 못한 문제점이 있었다.However, in the case of using the upper nozzle 31a, since the falling water remains even after the end of cooling, it causes a temperature deviation problem when the material enters later, as shown in FIG. 4, at the outlet of the upper nozzle 31a. There was also a problem that was not effective to remove the Ca compound formed.

본 발명은 후판압연공정시 가속냉각기 상부헤더의 상부노즐 출구에 존재하는 Ca 화합물을 제거하는 동시에 상부노즐의 체류수 낙하문제가 없이 상부노즐의 온도상승을 억제함으로써, 노즐막힘현상을 억제하고 강판을 균일하게 냉각시키는 장치 및 방법을 제공하는 것을 목적으로 한다.The present invention eliminates the Ca compound present in the upper nozzle outlet of the upper header of the accelerated chiller during thick plate rolling process and at the same time suppresses the temperature rise of the upper nozzle without the problem of falling water of the upper nozzle. It is an object of the present invention to provide an apparatus and method for uniformly cooling.

본 발명의 일 측면은, 가속냉각기의 상부헤더 내부의 온도를 측정하는 온도측정기; 날판이 상기 가속냉각기를 통과하는 라인에서 상기 가속냉각기의 입측 및 출측에 구비되어, 날판이 상기 가속냉각기 내부로 취입되거나 상기 가속냉각기 외부로 추출될 때의 날판을 감지하는 날판감지센서; 및 상기 온도측정기와 날판감지센서로부터 각각 온도측정신호와 날판감지신호를 실시간으로 수신하고, 상기 가속냉각기의 상부헤더 내부의 온도가 기 설정된 온도 이상인 경우에, 날판이 상기 가속냉각기를 통과하지 않는 아이들 시간동안, 상기 상부헤더 내부의 온도가 기 설정된 목표온도로 냉각되도록 상기 유량제어밸브를 제어하여 상기 가속냉각기의 하부헤더의 하부노즐에서 상기 상부헤더의 상부노즐로 분사되는 냉각수의 유량을 제어하는 제어기;를 포함하는 것을 특징으로 하는 후판압연공정의 가속냉각시 노즐막힘 방지장치를 제공한다.One aspect of the present invention, the temperature measuring instrument for measuring the temperature inside the upper header of the accelerated cooler; A blade detection sensor provided at an entry and exit side of the acceleration cooler in a line passing through the acceleration cooler, and detects the blade when the blade is blown into the acceleration cooler or extracted to the outside of the acceleration cooler; And receiving a temperature measurement signal and a blade detection signal from the temperature measuring device and the blade detection sensor in real time, and the blade does not pass through the acceleration cooler when the temperature inside the upper header of the acceleration cooler is higher than a preset temperature. During the time, the controller for controlling the flow rate of the cooling water injected from the lower nozzle of the lower header of the accelerator to the upper nozzle of the upper header by controlling the flow control valve so that the temperature inside the upper header is cooled to a predetermined target temperature It provides a nozzle clogging prevention device during the accelerated cooling of the thick plate rolling process comprising a.

본 발명의 일 실시예에서, 상기 날판감지센서는 날판이 발생하는 열을 감지하는 온도계를 포함하는 것을 특징으로 하는 후판압연공정의 가속냉각시 노즐막힘 방지장치를 제공한다.In one embodiment of the present invention, the blade detection sensor provides a nozzle clogging prevention device during the accelerated cooling of the thick plate rolling process, characterized in that it comprises a thermometer for detecting the heat generated by the blade.

본 발명의 다른 실시예에서, 상기 날판감지센서는 근접하는 날판이 정해진 감지거리 내에 들어오면 이를 감지하는 근접센서를 포함하는 것을 특징으로 하는 후판압연공정의 가속냉각시 노즐막힘 방지장치를 제공한다.In another embodiment of the present invention, the blade detection sensor provides a nozzle clogging prevention device during the accelerated cooling of the thick plate rolling process, characterized in that it comprises a proximity sensor for detecting when the adjacent blade comes within a predetermined sensing distance.

본 발명의 다른 측면은, 가속냉각기의 상부헤더 내부의 온도를 측정하고, 날판이 상기 가속냉각기를 통과하는 라인에서, 상기 가속냉각기의 입측 및 출측에서 날판이 상기 가속냉각기 내부로 취입되거나 상기 가속냉각기 외부로 추출될 때의 날판을 감지하는 단계; 상기 가속냉각기의 상부헤더 내부의 온도가 기 설정된 온도 이상인지를 판단하는 단계; 상기 가속냉각기의 상부헤더 내부의 온도가 기 설정된 온도 이상인 경우에, 날판이 상기 가속냉각기를 통과하지 않는 아이들 시간동안인지를 판단하는 단계; 및 상기 아이들 시간동안인 경우에, 상기 상부헤더 내부의 온도가 기 설정된 목표온도로 냉각되도록 상기 유량제어밸브를 제어하여 상기 가속냉각기의 하부헤더의 하부노즐에서 상기 상부헤더의 상부노즐로 분사되는 냉각수의 유량을 제어하는 단계;를 포함하는 것을 특징으로 하는 후판압연공정의 가속냉각시 노즐막힘 방지방법을 제공한다.Another aspect of the present invention is to measure the temperature inside the upper header of the accelerated cooler, and in the line through which the blade passes through the accelerated cooler, blades are blown into the acceleration cooler at the inlet and outlet of the accelerated cooler, or the accelerated cooler Detecting a blade when extracted to the outside; Determining whether a temperature inside the upper header of the accelerated cooler is greater than or equal to a preset temperature; Determining whether the blade is during an idle time not passing through the accelerator cooler when the temperature inside the upper header of the accelerator cooler is equal to or greater than a preset temperature; And during the idle time, the coolant sprayed from the lower nozzle of the lower header of the accelerator to the upper nozzle of the upper header by controlling the flow control valve so that the temperature inside the upper header is cooled to a predetermined target temperature. It provides a method for preventing nozzle clogging during the accelerated cooling of the thick plate rolling process comprising the step of controlling the flow rate of the.

본 발명에 따르면, 후판압연공정시 가속냉각기 상부헤더의 상부노즐 출구에 존재하는 Ca 화합물을 제거하는 동시에 상부노즐의 체류수 낙하문제가 없이 상부노즐의 온도상승을 억제함으로써, 노즐막힘현상을 억제하고 강판을 균일하게 냉각시 킬 수 있다.According to the present invention, it is possible to suppress the clogging of the nozzle by removing the Ca compound present in the upper nozzle outlet of the upper header of the accelerated cooler in the thick plate rolling process, and suppressing the temperature rise of the upper nozzle without the problem of remaining water dropping in the upper nozzle. The steel sheet can be cooled uniformly.

그리고, 본 발명에 따르면, 후판압연공정시 기존설비의 개조없이도 가속냉각작업을 하지 않는 아이들 시간에 고유량의 냉각수를 이용하여 상부노즐을 냉각함으로써, 노즐막힘현상을 방지하여 노즐수명의 연장 및 균일냉각에 의한 재질불량의 감소 및 강판변형의 저감을 통하여 노즐관리에 따른 비용 및 시간을 절약할 수 있다.In addition, according to the present invention, by cooling the upper nozzle using a high amount of cooling water during idle time without the need for accelerated cooling operation without modification of the existing equipment in the thick plate rolling process, to prevent the nozzle clogging phenomenon and to extend the nozzle life The reduction of material defects and the reduction of steel sheet deformation caused by cooling can save cost and time due to nozzle management.

또한, 본 발명에 따르면, 후판압연공정시 기존설비의 개조없이도 가속냉각작업을 하지 않는 아이들 시간에 고유량의 냉각수를 이용하여 상부노즐을 냉각함으로써, 교정물량 감소에 따른 물류부하의 감소, 재질불량의 저감에 따른 재생산비용의 감소를 기할 수 있다.In addition, according to the present invention, by cooling the upper nozzle using a high flow rate of cooling water in the idle time without the accelerated cooling operation without modification of the existing equipment in the thick plate rolling process, the reduction of logistics load, material defect due to the reduction of the calibration amount Reduction cost can be reduced by reducing

이하, 첨부된 도면을 참조하여 본 발명의 실시형태를 설명한다. 그러나, 본 발명의 실시형태는 여러 가지의 다른 형태로 변형될 수 있으며, 본 발명의 범위가 이하 설명하는 실시형태로만 한정되는 것은 아니다. 도면에서의 요소들의 형상 및 크기 등은 보다 명확한 설명을 위해 과장될 수 있으며, 도면상의 동일한 부호로 표시되는 요소는 동일한 요소이다.Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention may be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. The shape and the size of the elements in the drawings may be exaggerated for clarity and the same elements are denoted by the same reference numerals in the drawings.

도 5는 본 발명의 후판압연공정의 가속냉각시 노즐막힘 방지장치가 포함된 후판압연공정의 개략도이다. 도 5에 도시된 바와 같이, 후판압연공정에서는 날판(60)이 가열로(10), 조압연기/사상압연기(20), 가속냉각기(30), 핫 레벨러(40), 냉각대(50)를 거치면서 생산이 된다. 이때, 가속냉각기(300에서 날판(60)의 가속냉각시 노즐막힘을 방지하기 위해, 온도측정기(미도시), 날판감지센서(100a, 100b), 제어기(200)를 포함하는 노즐막힘 방지장치가 구비된다.5 is a schematic diagram of a thick plate rolling process including a nozzle clogging prevention device during the accelerated cooling of the thick plate rolling process of the present invention. As shown in FIG. 5, in the thick plate rolling process, the blade plate 60 includes a heating furnace 10, a rough rolling mill / steam rolling mill 20, an accelerated cooler 30, a hot leveler 40, and a cooling stand 50. It goes through production. At this time, in order to prevent the nozzle clogging during the accelerated cooling of the blade 60 in the accelerated cooler 300, the nozzle clogging prevention device including a temperature measuring device (not shown), blade detection sensors (100a, 100b), the controller 200 It is provided.

온도측정기는 가속냉각기(30)의 상부헤더 내부의 온도를 측정한다. 가속냉각기(30)의 헤더는 상부헤더와 하부헤더로 구성되고, 상부헤더와 하부헤더는 각각 약1000개 정도의 상부노즐과 하부노즐을 포함한다. 상부노즐과 하부노즐은 동일한 위치에 설치되어 소재에 냉각수를 분사한다.The temperature measuring device measures the temperature inside the upper header of the accelerated cooler 30. The header of the accelerated cooler 30 includes an upper header and a lower header, and the upper header and the lower header each include about 1000 upper and lower nozzles. The upper nozzle and the lower nozzle are installed at the same position to spray coolant to the material.

날판감지센서(100a, 100b)는 날판이 가속냉각기(30)를 통과하는 라인에서 가속냉각기(30)의 입측 및 출측에 구비되어, 날판이 가속냉각기(30) 내부로 취입되거나 가속냉각기(30) 외부로 추출될 때의 날판을 감지한다. 날판 감지를 위해, 날판감지센서(100a, 100b)는 날판이 발열하는 열을 감지하는 온도계, 또는 근접하는 날판이 정해진 감지거리 내에 들어오면 이를 감지하는 근접센서를 포함할 수 있다.Blade detection sensor (100a, 100b) is provided on the entry and exit side of the accelerated cooler 30 in the line through which the blade passes the acceleration cooler 30, the blade is blown into the acceleration cooler 30 or accelerated cooler (30) Detect the blade when it is extracted to the outside. For detecting the blade, the blade detection sensors 100a and 100b may include a thermometer for detecting heat generated by the blade, or a proximity sensor for detecting the blade when the blade comes within a predetermined sensing distance.

제어기(200)는 신호수신부(210), 온도비교부(220) 및 유량제어부(230)로 구성되어 중앙운전실에 설치되는데, 신호수신부(210)는 온도측정기와 날판감지센서(100a, 100b)로부터 각각 온도측정신호와 날판감지신호를 실시간으로 수신한다.The controller 200 includes a signal receiver 210, a temperature comparator 220, and a flow controller 230, and is installed in the central cab. The signal receiver 210 is installed from the temperature measuring instrument and the blade detection sensors 100a and 100b. Receive the temperature measurement signal and the blade detection signal in real time.

그리고, 온도비교부(220)는 가속냉각기(30) 상부헤더 내부의 온도가 기 설정된 온도 이상인지를 판단한다. 또한, 가속냉각기(30) 상부헤더 내부의 온도가 기 설정된 온도 이상이면, 유량제어부(230)는 날판이 가속냉각기(30)를 통과하지 않는 아이들 시간동안, 상부헤더 내부의 온도가 기 설정된 목표온도로 냉각되도록 상기 유량제어밸브를 제어하여 가속냉각기(30) 하부헤더의 하부노즐에서 상부헤더의 상 부노즐로 분사되는 냉각수의 유량을 제어한다. 가속냉각기(30)를 통과하는 날판은 수냉재일 경우와 비수냉재일 경우가 있는데, 비수냉재일 경우에는 날판이 가속냉각기(30)를 통과할 때 유량제어부(230)가 기 설정된 유량 이하의 냉각수가 하부노즐에서 나와 흐르도록 함으로써, 하부노즐을 보호할 수 있다.Then, the temperature comparison unit 220 determines whether the temperature inside the upper header of the accelerated cooler 30 is greater than or equal to a preset temperature. In addition, when the temperature inside the upper header of the accelerated cooler 30 is higher than or equal to the preset temperature, the flow rate controller 230 performs a preset target temperature during the idle time when the blade does not pass through the accelerated cooler 30. The flow rate control valve is controlled to cool the air by controlling the flow rate of the coolant injected from the lower nozzle of the lower header of the accelerator cooler 30 to the upper nozzle of the upper header. The blade passing through the accelerated cooler 30 may be a water coolant or a non-water coolant. In the case of the non-water coolant, the flow rate control unit 230 cools water below a preset flow rate when the blade passes through the accelerated cooler 30. By flowing out of the lower nozzle, the lower nozzle can be protected.

도 6은 본 발명의 가속냉각기 상부헤더의 상부노즐 출구에 Ca 화합물이 형성되지 않은 상태의 사시도이다. 도 6에 도시된 바와 같이, 본 발명을 적용함으로써 가속냉각기 상부헤더의 상부노즐(31a)에는 냉각종료 후에도 낙하 체류수가 남지 않게 되어, 이후에 소재가 진입할 때에도 온도편차문제를 유발시키지 않으며, 도 4에서와 같이 상부노즐(31a)의 출구에 형성된 Ca 화합물이 제거된다.6 is a perspective view of a state in which no Ca compound is formed at the outlet of the upper nozzle of the upper header of the accelerated cooler of the present invention. As shown in Figure 6, by applying the present invention, the drop nozzles do not remain in the upper nozzle 31a of the upper header of the accelerated cooler even after the end of the cooling, it does not cause a temperature deviation problem even when the material enters later, Figure As in 4, the Ca compound formed at the outlet of the upper nozzle 31a is removed.

도 7은 본 발명의 후판압연공정의 가속냉각시 노즐막힘 방지방법의 흐름도이다. 도 7을 도 5와 함께 살펴보면, 후판압연공정의 가속냉각시 노즐막힘 방지방법은 다음과 같다.7 is a flowchart of a method for preventing nozzle clogging during accelerated cooling of a thick plate rolling process of the present invention. Referring to FIG. 7 together with FIG. 5, a method of preventing nozzle clogging during accelerated cooling of a thick plate rolling process is as follows.

먼저, 온도측정기는 가속냉각기(30)의 상부헤더 내부의 온도를 측정하고, 날판감지센서(100a, 100b)는 날판이 가속냉각기(30)를 통과하는 라인의 가속냉각기(30)의 입측 및 출측에서 날판이 가속냉각기(30) 내부로 취입되거나 가속냉각기(30) 외부로 추출될 때의 날판을 감지한다(S100). 이때, 온도측정기가 측정한 온도신호 및 날판감지센서(100a, 100b)가 측정한 날판감지신호는 신호수신부(210)로 전송된다.First, the temperature measuring device measures the temperature inside the upper header of the accelerated cooler 30, and the blade detection sensors 100a and 100b measure the entry and exit of the accelerated cooler 30 in a line through which the blade passes the accelerated cooler 30. In the blade is sensed when the blade is blown into the accelerated cooler 30 or extracted to the outside of the accelerated cooler (30) (S100). In this case, the temperature signal measured by the temperature measuring instrument and the blade detection signals measured by the blade detection sensors 100a and 100b are transmitted to the signal receiver 210.

이후에, 온도비교부(220)가 가속냉각기의 상부헤더 내부의 온도가 기 설정된 온도 이상인지를 판단한다(S200).Thereafter, the temperature comparison unit 220 determines whether the temperature inside the upper header of the accelerated cooler is greater than or equal to the preset temperature (S200).

이후에, 가속냉각기(30) 상부헤더 내부의 온도가 기 설정된 온도 이상인 경우에, 유량제어부(230)가 날판이 가속냉각기를 통과하지 않는 아이들 시간동안인지를 판단한다(S300). 여기서, 아이들 시간동안인 경우에, 유량제어부(230)가 상부헤더 내부의 온도가 기 설정된 목표온도로 냉각되도록 유량제어밸브를 제어하여 가속냉각기의 하부헤더의 하부노즐에서 상부헤더의 상부노즐로 분사되는 냉각수의 유량을 제어한다(S400).Subsequently, when the temperature inside the upper header of the accelerated cooler 30 is higher than or equal to a preset temperature, the flow rate controller 230 determines whether the blade is during the idle time when the blade does not pass through the accelerated cooler (S300). In this case, during the idle time, the flow control unit 230 controls the flow control valve so that the temperature inside the upper header is cooled to a predetermined target temperature, and sprays the lower nozzle of the lower header of the accelerator cooler from the lower nozzle to the upper nozzle of the upper header. The flow rate of the cooling water to be controlled (S400).

상술한 바와 같은 S100 내지 S400 단계를 통하여, 가속냉각기(30) 하부헤더의 하부노즐로부터 분사되는 고유량의 냉각수를 이용하여 날판에서 방사되는 방사열에 의한 상부노즐의 온도상승을 억제할 수 있게 됨으로써, 상부노즐의 부식속도를 지연시키게 하는 동시에 상부노즐 출구에 집적된 Ca 화합물을 제거하여 막힘현상을 방지할 수 있게 된다.Through the steps S100 to S400 as described above, it is possible to suppress the temperature rise of the upper nozzle due to the radiant heat radiated from the blade by using the coolant of the high flow rate injected from the lower nozzle of the lower header of the accelerated cooler 30, At the same time, the corrosion rate of the upper nozzle is delayed, and the Ca compound accumulated at the outlet of the upper nozzle can be removed to prevent clogging.

본 발명은 상술한 실시형태 및 첨부된 도면에 의해 한정되지 아니한다. 첨부된 청구범위에 의해 권리범위를 한정하고자 하며, 청구범위에 기재된 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 다양한 형태의 치환, 변형 및 변경이 가능하다는 것은 당 기술분야의 통상의 지식을 가진 자에게 자명할 것이다.The present invention is not limited by the above-described embodiment and the accompanying drawings. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims, .

도 1은 종래의 후판압연공정의 개략도이다.1 is a schematic diagram of a conventional thick plate rolling process.

도 2는 도 1의 가속냉각기의 상세도이다.2 is a detailed view of the accelerated cooler of FIG.

도 3은 도 2의 상부헤더 내부의 상부노즐의 사시도이다.3 is a perspective view of an upper nozzle inside the upper header of FIG. 2.

도 4는 도 3의 상부노즐의 출구에 Ca 화합물이 형성된 상태의 사시도이다.4 is a perspective view of a state in which a Ca compound is formed at the outlet of the upper nozzle of FIG. 3.

도 5는 본 발명의 가속냉각시 노즐막힘 방지장치가 포함된 후판압연공정의 개략도이다.5 is a schematic diagram of a thick plate rolling process including a nozzle clogging prevention device during the accelerated cooling of the present invention.

도 6은 본 발명의 가속냉각기 상부헤더의 상부노즐 출구에 Ca 화합물이 형성되지 않은 상태의 사시도이다.6 is a perspective view of a state in which no Ca compound is formed at the outlet of the upper nozzle of the upper header of the accelerated cooler of the present invention.

도 7은 본 발명의 후판압연공정의 가속냉각시 노즐막힘 방지방법의 흐름도이다.7 is a flowchart of a method for preventing nozzle clogging during accelerated cooling of a thick plate rolling process of the present invention.

<도면의 주요 부분에 대한 부호의 설명>                 <Explanation of symbols for the main parts of the drawings>

10 : 가열로 20 : 조압연기/사상압연기10: heating furnace 20: roughing mill / sand mill

30 : 가속냉각기 40 : 핫 레벨러30: accelerated cooler 40: hot leveler

50 : 냉각대 60 : 소재50: cooling zone 60: material

100a, 100b : 날판감지센서 200 : 제어기100a, 100b: blade detection sensor 200: controller

210 : 신호수신부 220 : 온도비교부210: signal receiver 220: temperature comparison unit

230 : 유량제어부230: flow control unit

Claims (4)

가속냉각기의 상부헤더 내부의 온도를 측정하는 온도측정기;A temperature measuring device for measuring a temperature inside the upper header of the accelerated cooler; 날판이 상기 가속냉각기를 통과하는 라인에서 상기 가속냉각기의 입측 및 출측에 구비되어, 날판이 상기 가속냉각기 내부로 취입되거나 상기 가속냉각기 외부로 추출될 때의 날판을 감지하는 날판감지센서; 및A blade detection sensor provided at an entry and exit side of the acceleration cooler in a line passing through the acceleration cooler, and detects the blade when the blade is blown into the acceleration cooler or extracted to the outside of the acceleration cooler; And 상기 온도측정기와 날판감지센서로부터 각각 온도측정신호와 날판감지신호를 실시간으로 수신하고, 상기 가속냉각기의 상부헤더 내부의 온도가 기 설정된 온도 이상인 경우에, 날판이 상기 가속냉각기를 통과하지 않는 아이들 시간동안, 상기 상부헤더 내부의 온도가 기 설정된 목표온도로 냉각되도록 상기 유량제어밸브를 제어하여 상기 가속냉각기의 하부헤더의 하부노즐에서 상기 상부헤더의 상부노즐로 분사되는 냉각수의 유량을 제어하는 제어기;The idle time when the temperature measurement signal and the blade detection signal are respectively received from the temperature measuring device and the blade detection sensor in real time, and the temperature inside the upper header of the acceleration cooler is higher than a preset temperature, the blade does not pass through the acceleration cooler. A controller for controlling the flow rate of the coolant injected from the lower nozzle of the lower header of the acceleration cooler to the upper nozzle of the upper header so that the temperature inside the upper header is cooled to a predetermined target temperature; 를 포함하는 것을 특징으로 하는 후판압연공정의 가속냉각시 노즐막힘 방지장치.Preventing nozzle clogging during the accelerated cooling of the thick plate rolling process comprising a. 제1항에 있어서,The method of claim 1, 상기 날판감지센서는 날판이 발생하는 열을 감지하는 온도계를 포함하는 것을 특징으로 하는 후판압연공정의 가속냉각시 노즐막힘 방지장치.The blade detection sensor is nozzle clogging prevention device during the accelerated cooling of the thick plate rolling process, characterized in that it comprises a thermometer for detecting the heat generated by the blade. 제1항에 있어서,The method of claim 1, 상기 날판감지센서는 근접하는 날판이 정해진 감지거리 내에 들어오면 이를 감지하는 근접센서를 포함하는 것을 특징으로 하는 후판압연공정의 가속냉각시 노즐막힘 방지장치.The blade detection sensor is a nozzle clogging prevention device during the accelerated cooling of the thick plate rolling process, characterized in that it comprises a proximity sensor for detecting when the adjacent blade comes within a predetermined sensing distance. 가속냉각기의 상부헤더 내부의 온도를 측정하고, 날판이 상기 가속냉각기를 통과하는 라인에서, 상기 가속냉각기의 입측 및 출측에서 날판이 상기 가속냉각기 내부로 취입되거나 상기 가속냉각기 외부로 추출될 때의 날판을 감지하는 단계;Temperature at the inside of the upper header of the accelerated cooler is measured, and blades are blown into the accelerated cooler or extracted outside the accelerated cooler at the entry and exit sides of the accelerated cooler in a line through which the blade passes through the accelerated cooler. Detecting; 상기 가속냉각기의 상부헤더 내부의 온도가 기 설정된 온도 이상인지를 판단하는 단계;Determining whether a temperature inside the upper header of the accelerated cooler is greater than or equal to a preset temperature; 상기 가속냉각기의 상부헤더 내부의 온도가 기 설정된 온도 이상인 경우에, 날판이 상기 가속냉각기를 통과하지 않는 아이들 시간동안인지를 판단하는 단계; 및Determining whether the blade is during an idle time not passing through the accelerator cooler when the temperature inside the upper header of the accelerator cooler is equal to or greater than a preset temperature; And 상기 아이들 시간동안인 경우에, 상기 상부헤더 내부의 온도가 기 설정된 목표온도로 냉각되도록 상기 유량제어밸브를 제어하여 상기 가속냉각기의 하부헤더의 하부노즐에서 상기 상부헤더의 상부노즐로 분사되는 냉각수의 유량을 제어하는 단계;During the idle time, by controlling the flow control valve so that the temperature inside the upper header is cooled to a predetermined target temperature of the coolant is injected from the lower nozzle of the lower header of the accelerator cooler to the upper nozzle of the upper header. Controlling the flow rate; 를 포함하는 것을 특징으로 하는 후판압연공정의 가속냉각시 노즐막힘 방지방법.Preventing nozzle clogging during accelerated cooling of the thick plate rolling process comprising a.
KR1020080119720A 2008-11-28 2008-11-28 Preventing nozzle clogging and prevention method during accelerated cooling of thick plate rolling process KR101060947B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101310829B1 (en) * 2011-07-28 2013-09-25 현대제철 주식회사 Cooling device for hot rolled sheet
KR101424887B1 (en) * 2012-09-27 2014-07-31 현대제철 주식회사 Method and device for detecting valve flow error hunting

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KR200231485Y1 (en) 2000-12-22 2001-07-19 포항종합제철 주식회사 blocked up prevention and auto penetration apparatus in Alkali spray nozzle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101310829B1 (en) * 2011-07-28 2013-09-25 현대제철 주식회사 Cooling device for hot rolled sheet
KR101424887B1 (en) * 2012-09-27 2014-07-31 현대제철 주식회사 Method and device for detecting valve flow error hunting

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