KR20020089683A - Control apparatus of the injection amount of the pulverized coal - Google Patents

Control apparatus of the injection amount of the pulverized coal Download PDF

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Publication number
KR20020089683A
KR20020089683A KR1020010028311A KR20010028311A KR20020089683A KR 20020089683 A KR20020089683 A KR 20020089683A KR 1020010028311 A KR1020010028311 A KR 1020010028311A KR 20010028311 A KR20010028311 A KR 20010028311A KR 20020089683 A KR20020089683 A KR 20020089683A
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KR
South Korea
Prior art keywords
pulverized coal
injection amount
amount
feed hopper
differential pressure
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KR1020010028311A
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Korean (ko)
Inventor
강병광
조진래
강대호
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주식회사 포스코
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Priority to KR1020010028311A priority Critical patent/KR20020089683A/en
Publication of KR20020089683A publication Critical patent/KR20020089683A/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements
    • C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/24—Test rods or other checking devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/20—Arrangements of devices for charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/26—Arrangements of controlling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/10—Charging directly from hoppers or shoots

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Blast Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

PURPOSE: An apparatus for controlling the injection amount of pulverized coal is provided which is capable of independently controlling the injection amount of pulverized coal depending on temperature variation of the front of each of the tuyeres when injecting pulverized coal through tuyeres into a blast furnace. CONSTITUTION: In an apparatus for controlling the injection amount of pulverized coal in which the injection amount of pulverized coal that is supplied from a feed hopper(2) and injected into a blast furnace(7) through a plural lances(6c) is controlled, the apparatus comprises a measuring part(9) that is installed at the lower line of the feed hopper to measure the injection amount of pulverized coal and transmit the measured injection amount; and a control part that is installed between the feed hopper and the blast furnace(7) to control the injection amount of pulverized coal per the lances(6c), wherein the measuring part(9) comprises a straight pipe part installed on a pipe branched from the feed hopper(2) and equipped with a differential pressure gauge and a thermometer, and an expansion pipe part connected to the lower part of the straight pipe part and equipped with a differential pressure gauge and an absolute pressure gauge, two pressure tabs connected to the differential pressure gauges are installed at the straight pipe part and the expansion pipe part, and the control part comprises a detection part, an operating part(6d) and an injection amount controller(13).

Description

미분탄 취입량 제어장치{Control apparatus of the injection amount of the pulverized coal}Control apparatus of the injection amount of the pulverized coal}

본 발명은 고로 내부에 취입되는 미분탄의 취입량을 측정하고 제어하는 장치에 관한 것으로, 특히 미분탄을 고로의 풍구로 취입하는데 있어 각 풍구의 선단 온도 변화에 따라 미분탄 취입량을 독립적으로 제어할 수 있는 미분탄 취입량 제어장치에 관한 것이다.The present invention relates to a device for measuring and controlling the amount of pulverized coal blown into the blast furnace, and in particular, in the case of blowing pulverized coal into the blast furnace blast furnace, it is possible to independently control the amount of pulverized coal in accordance with the change of the tip temperature of each blast furnace. The present invention relates to a pulverized coal injection amount control device.

일반적으로 도 1에 도시된 바와 같이, 고로(7)내에 미분탄 취입은 풍구(7a)를 통해 열풍을 불어넣어 장입된 광석을 녹여 용선(pig iron)을 생산하는 과정에서, 풍구(7a)를 통해 미분탄을 취입하면 장입물 중 값 비싼 코크스(coke)를 대체하게 됨으로써 원가 절감을 할 수 있고, 또한 풍구(7a) 선단에서의 연소 효율을 향상시켜 생산량을 증대시킬 수 있으며, 노열 관리 및 풍압제어 등 노황을 조정하는 중요한 역할을 기대할 수 있다.In general, as shown in FIG. 1, the pulverized coal blowing in the blast furnace 7 blows hot air through the tuyere 7a to melt the charged ore to produce pig iron, and through the tuyere 7a. The injection of pulverized coal can reduce the cost by replacing expensive coke in the charges, and can increase the production by improving the combustion efficiency at the tip of the tuyere 7a. It can be expected to play an important role in coordinating aging.

종래에는 피드 호퍼(2)에서 고로(7)내의 미분탄 취입량을 제어하기 위해 피드 호퍼(2)의 중량(Weight)을 중량 측정 센서(2a;load cell)에서 측정하여, 중량 변환 장치(3;weighting panel)에서 중량값을 아날로그 신호로 출력하면, 취입량 계산 장치(4)에서 중량 신호를 받아 시간 변화에 따른 중량 변화량으로 시간당 미분탄 취입량을 계산하였다.Conventionally, in order to control the amount of pulverized coal in the blast furnace 7 in the feed hopper 2, the weight of the feed hopper 2 is measured by a weight measuring sensor 2a, and the weight conversion device 3; When the weight value is output as an analog signal from the weighting panel, the blown amount calculation device 4 receives the weight signal and calculates the amount of fine coal injection per hour as the weight change amount according to the time change.

그러나, 상술한 종래의 기술은 하기와 같은 문제점이 있다.However, the conventional technique described above has the following problems.

상기 미분탄 취입량을 이전 측정값과 현재 측정값과의 편차값을 지연시간(delay time)으로 나누어 계산하기 때문에, 실제 미분탄 취입량을 제어하는데 불필요한 시간(dead time)이 소요되고 미분탄 취입량의 정확한 측정이 어려워져서, 전반적인 고로(7) 노황 관리가 어려워지는 문제점을 초래한다.Since the pulverized coal injection amount is calculated by dividing the deviation value between the previous measurement value and the current measurement value by the delay time, it takes a dead time to control the actual pulverized coal injection amount and the accurate The measurement becomes difficult, resulting in a problem that the overall blast furnace 7 management of yellowing becomes difficult.

본 발명은 상기한 종래의 문제점을 해결하고자 안출된 것으로서, 미분탄 취입량을 실시간으로 측정하고 제어할 수 있는 미분탄 취입량 제어장치를 제공함에 그 목적이 있다.The present invention has been made to solve the above-described problems, and an object thereof is to provide a pulverized coal injection amount control apparatus capable of measuring and controlling the pulverized coal injection amount in real time.

도 1은 종래 기술에 따른 미분탄 취입량 제어장치를 도시한 도면.1 is a view showing a fine coal injection amount control apparatus according to the prior art;

도 2는 본 발명에 따른 미분탄 취입량 제어장치를 도시한 도면.2 is a view showing a fine coal injection amount control apparatus according to the present invention.

도 3은 본 발명에 따른 차압 방식에 의한 미분탄 측정부의 단면도.3 is a cross-sectional view of the pulverized coal measuring unit by the differential pressure method according to the present invention.

도 4는 본 발명에 따른 차압으로 검출되는 장치의 상세 기능을 도시한 도면.Figure 4 shows the detailed function of the device detected by the differential pressure according to the present invention.

도 5는 본 발명에 따른 풍구 선단 온도에 의한 각 랜스의 미분탄 취입량 제어 프로그램을 도시한 구성도.5 is a block diagram showing a pulverized coal injection amount control program of each lance by the tip of the tuyere according to the present invention.

도 6은 본 발명의 실시예에 따른 제어 흐름도.6 is a control flowchart according to an embodiment of the present invention.

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

2 : 피드 호퍼 2a : 중량 측정 센서2: feed hopper 2a: weighing sensor

3 : 중량 변환 장치 4 : 취입량 계산 장치3: weight conversion device 4: blowing amount calculation device

7 : 고로 7a : 풍구7: blast furnace 7a: windball

9 : 측정부 12 : 실시간 측정 장치9 measuring unit 12 real-time measuring device

13 : 취입량 제어장치13: Blowing amount control device

상기한 목적을 달성하기 위해 본 발명은 피드 호퍼에서 유입되어 고로 내부로 복수의 랜스를 통해 취입되는 미분탄의 취입량을 제어하는 미분탄 취입량 제어장치에 있어서, 상기 피드 호퍼의 하부 라인에 설치되어 상기 미분탄의 취입량을 측정하고 상기 측정된 취입량을 전송하는 측정부와; 상기 피드 호퍼와 고로 사이에 설치되어 상기 랜스별로 미분탄 취입량을 제어하는 제어부로; 구성된 것을 특징으로 하는 미분탄 취입량 제어장치를 제공한다.In order to achieve the above object, the present invention is a pulverized coal injection amount control device for controlling the injection amount of the pulverized coal flowed into the blast furnace into the blast furnace through a plurality of lances, it is installed in the lower line of the feed hopper A measuring unit which measures the blowing amount of pulverized coal and transmits the measured blowing amount; A control unit installed between the feed hopper and the blast furnace to control the amount of pulverized coal injection for each lance; Provided is a pulverized coal injection amount control device, characterized in that configured.

이러한 본 발명에서 상기 측정부는 상기 피드 호퍼에서 분기되는 배관에 설치되며 차압계와 온도계를 구비한 직관부와, 상기 직관부의 하부에 연결되고 차압계와 절대압력계를 구비한 확대관부로 구성된 것을 특징으로 한다.In the present invention, the measuring unit is installed in the pipe branched from the feed hopper, characterized in that it consists of a straight pipe portion having a differential pressure gauge and a thermometer, and an enlarged pipe portion connected to the lower portion of the straight pipe portion and having a differential pressure gauge and an absolute pressure gauge.

또한, 본 발명에서 상기 직관부와 확대관부에는 각각의 차압계와 접속하는 2개의 압력 탭이 설치된 것을 특징으로 한다.In the present invention, the straight pipe portion and the enlarged pipe portion is characterized in that two pressure taps are connected to each of the differential pressure gauge.

또한, 본 발명에서 상기 제어부는 상기 각 랜스에 차압방식으로 미분탄의 취입량을 검출하는 검출부와, 상기 각 랜스별로 미분탄의 취입량을 가감하는 조작부와, 상기 고로의 풍구선단 온도 입력을 통해 상기 각 랜스별로 미분탄의 취입량을설정하고 상기 설정값과 각 랜스별 취입량 측정값을 비교하여 제어 신호를 출력하는 취입량 제어장치로 구성된 것을 특징으로 한다.In the present invention, the control unit is a detection unit for detecting the injection amount of pulverized coal by the differential pressure method to each of the lances, an operation unit for adding or subtracting the injection amount of the pulverized coal for each lance, and each of the through the vent opening temperature of the blast furnace It is characterized in that the injection amount control device for setting the blowing amount of the pulverized coal for each lance and compares the set value and the blowing amount measurement value for each lance and outputs a control signal.

이하, 첨부된 도면을 참조하여 본 발명의 구성에 대해 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the present invention.

도 2는 본 발명의 실시예에 따른 호퍼 중량에 의한 취입량 산출 방식의 구성도, 도 3은 본 발명의 실시예에 따른 미분탄 취입량 제어 상태 구성도, 도 4는 본 발명의 실시예에 따른 차압 방식에 의한 취입량 직접 검출 장치의 외형 도면, 도 5는 본 발명의 실시예에 따른 차압으로 검출되는 장치의 상세 기능을 도시한 도면이다.2 is a configuration diagram of a blow amount calculation method based on the hopper weight according to an embodiment of the present invention, Figure 3 is a configuration diagram of the fine coal injection amount control state according to an embodiment of the present invention, Figure 4 according to an embodiment of the present invention 5 is a diagram illustrating a detailed function of an apparatus for detecting a differential pressure according to an embodiment of the present invention.

도 2 및 도 3에 도시된 바와 같이, 측정부(9)는 피드 호퍼(2)에서 분기되는 배관에 차압계(9d)와 온도계(9c)를 장치한 직관부(9a)와, 상기 직관부의 하부에 연결되며 차압계(9d)와 절대압계(9e)를 구비한 확대관부(9b)로 구성되어 있다.As shown in FIG. 2 and FIG. 3, the measuring unit 9 includes a straight pipe portion 9a provided with a differential pressure gauge 9d and a thermometer 9c on a pipe branched from the feed hopper 2, and a lower portion of the straight pipe portion. It consists of an enlarged pipe section 9b having a differential pressure gauge 9d and an absolute pressure gauge 9e.

상기 직관부(9a)와 확대관부(9b)에는 각각 2개의 압력 탭(9f)이 설치되고 이들은 차압계(9d)와 접속한다.Two pressure taps 9f are provided in the straight pipe portion 9a and the enlarged pipe portion 9b, respectively, and they are connected to the differential pressure gauge 9d.

또한, 도 4에 도시된 바와 같이, 상기 차압계(9d) 및 온도계(9c), 절대압계(9e)에 의해 측정된 공기차압(12b) 및 온도 측정값(12d), 절대압(12a)을 실시간 측정장치(12)에 입력하여 연산한 분체유량(12f)값을 취입량 조절계(5)(도 2 참조)로 전송하도록 구성되어 있다.In addition, as shown in FIG. 4, the air differential pressure 12b, the temperature measurement value 12d, and the absolute pressure 12a measured by the differential pressure gauge 9d, the thermometer 9c, and the absolute pressure gauge 9e are measured in real time. It is configured to transmit the powder flow rate 12f calculated by inputting to the apparatus 12 to the blowing amount regulator 5 (see FIG. 2).

상기 제어부는 도 2에 도시된 바와 같이, 분배기(Distributor,6b)에서 고로(7)의 각 풍구(7a)로 미분탄을 취입하는 각 랜스(6c)에 차압 방식으로 취입량을 상기 측정부(9)와 동일한 장치를 이용하여 검출하는 검출부와,각 랜스별로 취입량을 가감하는 조작부(6d)와,풍구선단 온도를 입력하여 각 랜스별로 미분탄 취입량 설정값을 결정하고 이 설정값과 각 랜스별 취입량 측정값을 비교하여 적합한 취입량 제어 신호를 출력하는 취입량 제어 장치(13)로 구성되어 있다.As illustrated in FIG. 2, the control unit measures the blowing amount in a differential pressure manner to each of the lances 6c which injects the pulverized coal from the distributor 6b into the respective tuyeres 7a of the blast furnace 7. ) and a detection unit for detecting, using the same device, and the control panel (6d) which will be added to or subtracted from the injection quantity for each lance, enter the tuyere tip temperature determines the coal injection amount settings for each lance to the set value and for each lance It is comprised by the blow amount control apparatus 13 which compares a blow amount measurement value, and outputs a suitable blow amount control signal.

상기와 같이 구성된 본 발명의 작용을 도 2 내지 도 5를 참조하여 상세히 설명한다.The operation of the present invention configured as described above will be described in detail with reference to FIGS.

공기에 의해 분립체가 수송되는 경우에, 입자의 가속과 방향 전환이 없는 정속구간에서 직관부의 압력손실은 공기류에 의한 압력손실과,입자가 관면에 부딛혀서 생기는 부가 압력 손실의 합계로 나타난다.When the transporter is powder by air, the pressure loss at the straight portion of the constant stage without particle acceleration and direction change is represented as the sum of pressure losses and the additional pressure loss caused hyeoseo particles meet a upper surface by the air flow.

상기 분립체의 생긴 모양과 수송 관로의 형상이 결정되면 입자에 의한 압력 손실과 공기류에 의한 압력 손실의 비는 혼합비와 일정한 상관 관계를 나타낸다.When the shape of the granular material and the shape of the transport pipe are determined, the ratio of the pressure loss due to the particles and the pressure loss due to the air flow has a constant correlation with the mixing ratio.

따라서, 상기 직관부(9a)의 압력 손실비에서 혼합비(12c)를 구하고 공기유량(12e)을 구하면 분체 유량(12f)을 구할수 있다.Therefore, if the mixing ratio 12c is obtained from the pressure loss ratio of the straight pipe portion 9a and the air flow rate 12e is obtained, the powder flow rate 12f can be obtained.

공기의 유량은 확대관(9b)의 차압으로 구할수 있는데 확대관(9b)의 압력 탭(9f)에서는 좁은 면적에서 넓은 면적으로 분체가 이동함에 따라 넓은 면적에서는 분체가 확산되어 분체에 의한 차압은 거의 없고,공기에 의해서만 차압이 발생하므로 이 차압으로 순수한 공기의 유량을 측정할 수 있다.The flow rate of air can be obtained by the differential pressure of the enlarged tube 9b. As the powder moves from a narrow area to a large area in the pressure tap 9f of the enlarged tube 9b, the powder diffuses in a large area and the differential pressure by the powder Almost no , the differential pressure is generated only by the air, so the flow rate of pure air can be measured by this differential pressure.

그런데, 기체의 체적은 압력과 온도에 따라 변화하므로 절대압계(9e)의 압력과 온도계(9c)의 온도를 측정하여 온압 보정을 실시하여 유량을 측정하여야 한다.However, since the volume of the gas varies depending on the pressure and the temperature, it is necessary to measure the flow rate by measuring the pressure of the absolute pressure gauge 9e and the temperature of the thermometer 9c to perform a warm pressure correction.

하기하는 식들을 의해 본 발명은 보다 상세히 설명된다.The present invention is explained in more detail by the following formulas.

△P = △Pa+ △Ps------------------- (식 1)ΔP = ΔP a + ΔP s ------------------- (Equation 1)

------ (식 2) ------ (Equation 2)

분체유량 = 혼합비(m) ×공기유량 ----- (식 3)Powder flow rate = Mixing ratio (m) × Air flow rate ----- (Equation 3)

여기서, △P ; 전압력손실Where ΔP; Power loss

△Pa; 공기에 의한 압력손실ΔP a ; Air pressure loss

△Ps; 분체에 의한 압력손실ΔP s ; Pressure loss due to powder

K ; 보정계수K; Correction factor

식 1은 전압력손실에 대한 식이고, 식 2는 혼합비에 관한 식이며 식 3은 분체유량에 관한 식이다.Equation 1 is for the total pressure loss, Equation 2 is for the mixing ratio and Equation 3 is for the powder flow rate.

직관부(9a)에서 측정되는 압력 손실은 직관부(9a)의 전압력 손실 즉, 분체와 공기가 함께 작용하여 측정되는 압력손실을 측정하고,확대관(9b)에서 측정되는 공기만의 압력손실을 연산하여 도출된다.(식 1)The pressure loss measured by the straight pipe portion 9a measures the total pressure loss of the straight pipe portion 9a , that is , the pressure loss measured by the action of the powder and air together, and the pressure loss of the air only measured by the expansion pipe 9b. It is derived by calculating (Equation 1).

또한, 혼합비(12c)는 분체에 의한 압력 손실과 공기에 의한 압력손실의 비로 구한다.(식 2)In addition, the mixing ratio 12c is obtained by the ratio of the pressure loss caused by the powder and the pressure loss caused by the air.

식 1과 식 2에 의해 도출된 혼합비(12c)와 공기유량(12e)을 가지고 분체 유량(12f)을 측정할 수 있다.(식 3)The powder flow rate 12f can be measured with the mixing ratio 12c and the air flow rate 12e derived by the equations (1) and (2).

풍구별로 취입량을 제어할 수 있는 제어부의 취입량 제어 장치(13)는 상기의 측정부(9)를 취입 랜스(6c)에 설치하여 측정한 취입량과,풍구 선단 온도를 함께랜스별 취입량 제어 장치(13)로 입력(13a)하여 풍구 선단 온도에 따른 랜스별 취입량 설정값을 구한다.(식 4)A blowing amount blown amount control unit 13 of the control unit which can control each tuyere is a blow amount and the blown amount of each lance with the tuyere tip temperature measured by installing the measuring unit (9) of the blow lance (6c) An input 13a is input to the control device 13 to obtain a set value of blow-in for each lance according to the tip of the tuyere. (Equation 4)

상기 설정값과 랜스별 취입 측정값을비교하여(13b) 최적의 취입량 제어를 위한 조작부 제어 출력값(13c)이 조작부(6d)에 전송되어 최적의 풍구 선단 온도를 제어 하게 된다.(식 5)Comparing the set value and the blown measurement value for each lance (13b), the control unit control output value 13c for optimum blowing amount control is transmitted to the operating unit 6d to control the optimum end opening temperature (Equation 5).

그리고, 상기 조작부(6d)는 출력부(13c)의 신호에 의해 제어되도록 되어있다.And the said operation part 6d is controlled by the signal of the output part 13c.

상기 식 4는 취입량 설정값을 구하는 식이며, 식 5는 제어 출력값을 구하는 식이다.Equation 4 is a formula for obtaining a blow-in amount set value, and equation 5 is a formula for obtaining a control output value.

취입량 설정값 = (풍구선단 온도/풍구선단온도 범위)×취입량 범위 --(식 4)Blowing amount set value = (Bulb end temperature / Bulb end temperature range) × Blowing amount range-(Equation 4)

제어 출력값 = (취입량 설정값 - 취입량 측정값) ×PID 제어값 --(식 5)Control output value = (Blowing amount set value-Blown amount measured value) × PID control value-(Equation 5)

이하, 도 6을 참조하여 본 발명의 작동 순서에 대해 설명한다.Hereinafter, an operation sequence of the present invention will be described with reference to FIG. 6.

미분탄 취입량 측정이 시작되면, 상기에 언급한 바와 같이 도 3의 측정부(9)에서 확대관부 차압(12b) 및 절대압(12a)과 온도(9c)가 측정되면, 공기 유량이 산출되고(12d) 따라서, 분체유량(12f)이 산출된다.When the pulverized coal injection amount measurement is started, as described above, when the enlarged pipe portion differential pressure 12b and the absolute pressure 12a and the temperature 9c are measured in the measuring unit 9 of FIG. 3, the air flow rate is calculated (12d). Thus, the powder flow rate 12f is calculated.

상기 산출된 분체유량(12f)은 도 2에 도시된 취입량 조절계(5)로 입력되고 피드 호퍼 압력조절계(5a)로 입력되어 상기 피드 호퍼 압력조절계(5a)의 값에 따라피드 호퍼의 압력 제어변(5b, 5c)이 조작되게 된다.The calculated powder flow rate 12f is input to the blow amount regulator 5 shown in FIG. 2 and input to the feed hopper pressure regulator 5a to control the pressure of the feed hopper according to the value of the feed hopper pressure regulator 5a. The sides 5b and 5c are operated.

또한, 상기에서 분체유량(12f)이 산출되면 상기 분체유량(12f) 값이 취입량 제어장치(13)로 입력되어 각 풍구별 미분탄 취입량을 조절할 수 있다.In addition, when the powder flow rate 12f is calculated, the powder flow rate 12f may be input to the blowing amount control device 13 to adjust the amount of fine coal injection for each tuyere.

상기 취입량 제어장치(13)의 작동흐름은 도 5에 도시된 바와 같이, 랜스별 취입량을 입력부(13a)에 입력하게되면 랜스별 취입량과 풍구 선단온도에 따른 유량 조작신호 제어연산이 연산제어부(13b)에서 이루어지고, 이후에 출력부(13c)에서 상기 제어연산 산출값을 아날로그(Analog) 신호로 변환하여 출력하고 마지막으로 조작부(6d)(도 2 참조)에서 상기 출력부(13c)의 아날로그 신호에 의한 개도제어가 이루어 진다.As shown in FIG. 5, the flow rate control signal control operation is calculated according to the blow amount for each lance and the tip end temperature of the tuyere, as shown in FIG. 5. The control unit 13b converts the control operation calculated value into an analog signal and outputs the result of the control unit 13c. Finally, the control unit 6d (see FIG. 2) outputs the output unit 13c. Opening control by analog signal is done.

상기한 바와 같이, 본 발명에 따르면 각 피드 호퍼에서 배출되는 취입량을 차압 방식으로 실시간 측정함으로써 고로 노황 변화에 대하여 운전자의 신속한 조치가 가능할 뿐만아니라 각 랜스에 취입되는 미분탄의 양을 독립 제어함으로써 설비수명 단축을 방지할 수 있고 용선 출선량 증가 등의 효과를 기대할 수 있다.As described above, according to the present invention, by real-time measurement of the amount of blowing discharged from each feed hopper by the differential pressure method, it is possible not only to prompt the driver to respond to changes in the blast furnace, but also to independently control the amount of pulverized coal injected into each lance. It is possible to prevent shortening of life and to increase the amount of chartered ships.

Claims (4)

피드 호퍼에서 유입되어 고로 내부로 복수의 랜스를 통해 취입되는 미분탄의 취입량을 제어하는 미분탄 취입량 제어장치에 있어서,In the pulverized coal injection amount control device for controlling the injection amount of pulverized coal flowed from the feed hopper and blown into the blast furnace through a plurality of lances, 상기 피드 호퍼의 하부 라인에 설치되어 상기 미분탄의 취입량을 측정하고 상기 측정된 취입량을 전송하는 측정부와;A measuring unit installed at a lower line of the feed hopper to measure the blowing amount of the pulverized coal and transmit the measured blowing amount; 상기 피드 호퍼와 고로 사이에 설치되어 상기 랜스별로 미분탄 취입량을 제어하는 제어부로; 구성된 것을 특징으로 하는 미분탄 취입량 제어장치.A control unit installed between the feed hopper and the blast furnace to control the amount of pulverized coal injection for each lance; Pulverized coal injection amount control device, characterized in that configured. 제 1항에 있어서,The method of claim 1, 상기 측정부는 상기 피드 호퍼에서 분기되는 배관에 설치되며 차압계와 온도계를 구비한 직관부와, 상기 직관부의 하부에 연결되고 차압계와 절대압계를 구비한 확대관부로 구성된 것을 특징으로 하는 미분탄 취입량 제어장치.The measuring unit is installed in a pipe branched from the feed hopper and the pulverized coal injection amount control device comprising a straight pipe portion having a differential pressure gauge and a thermometer, and an enlarged pipe portion connected to the lower portion of the straight pipe portion and having a differential pressure gauge and an absolute pressure gauge. . 제 2항에 있어서,The method of claim 2, 상기 직관부와 확대관부에는 상기 차압계와 접속하는 2개의 압력 탭이 설치된 것을 특징으로 하는 미분탄 취입량 제어장치.The pulverized coal injection amount control device is installed in the straight pipe portion and the enlarged pipe portion, two pressure taps connected with the differential pressure gauge. 제 1항에 있어서,The method of claim 1, 상기 제어부는 상기 각 랜스에 차압방식으로 미분탄의 취입량을 검출하는 검출부와, 상기 각 랜스별로 미분탄의 취입량을 가감하는 조작부와, 상기 고로의 풍구선단 온도 입력을 통해 상기 각 랜스별로 미분탄의 취입량을 설정하고 상기 설정값과 각 랜스별 취입량 측정값을 비교하여 제어 신호를 출력하는 취입량 제어장치로 구성된 것을 특징으로 하는 미분탄 취입량 제어장치.The control unit includes a detection unit for detecting the injection amount of pulverized coal into each lance by a differential pressure method, an operation unit for adding or subtracting the injection amount of pulverized coal for each lance, and the input of the pulverized coal for each lance through the input of the temperature of the tuyeres of the blast furnace. And a blown amount control device configured to set a quantity and compare a set value with a blown amount measured value for each lance and output a control signal.
KR1020010028311A 2001-05-23 2001-05-23 Control apparatus of the injection amount of the pulverized coal KR20020089683A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100905647B1 (en) * 2002-12-17 2009-06-30 주식회사 포스코 An apparatus for controlling the injection sequence of pulverized coal feed hoppers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100905647B1 (en) * 2002-12-17 2009-06-30 주식회사 포스코 An apparatus for controlling the injection sequence of pulverized coal feed hoppers

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