KR20100040469A - A dual mode control method for a combustion system using a additional co concentration - Google Patents
A dual mode control method for a combustion system using a additional co concentration Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 19
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- 238000007254 oxidation reaction Methods 0.000 claims abstract description 16
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- 238000005259 measurement Methods 0.000 claims description 10
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 abstract description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract 5
- 229910002090 carbon oxide Inorganic materials 0.000 abstract 5
- 238000010586 diagram Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
Description
본 발명은 CO 농도 측정 시스템을 이용한 산화 환원 분위기 제어 방법에 관한 것으로, 보다 상세하게는, CO2 농도 기반의 분위기 자동 제어 시스템에서 CO를 추가적으로 측정하여 분위기의 산화 환원 정도(레벨)를 평가하도록 하는 CO 농도 측정 시스템을 이용한 산화 환원 분위기 제어 방법에 관한 것이다. The present invention relates to a redox atmosphere control method using a CO concentration measurement system, and more particularly, to evaluate the redox level (level) of the atmosphere by additionally measuring CO in a CO 2 concentration-based atmosphere automatic control system. A redox atmosphere control method using a CO concentration measuring system.
일반적으로, 분위기 가스의 산화성 평가는 환원성 평가와 같이 환원 분위기 정도를 판단하는 것으로 분위기를 판정하는 방법을 이용한다. In general, the oxidative evaluation of the atmospheric gas uses a method of determining the atmosphere by judging the degree of the reducing atmosphere as in the reductive evaluation.
도 1은 종래의 환원 분위기 제어 구성도이고, 도 2는 종래의 산화/환원 평행 곡선을 나타내는 도면이다. 1 is a diagram illustrating a conventional reducing atmosphere control configuration, and FIG. 2 is a diagram illustrating a conventional oxidation / reduction parallel curve.
산화 분위기가 일반적인 가열로에서 완전 연소를 위한 조건이고, 이 경우에 연소 배가스 중의 CO는 인체의 유해성과 연소 효율 악화의 원인으로 작동하므로 감 시의 대상으로만 사용된다. The oxidizing atmosphere is a condition for complete combustion in a typical furnace, in which case the CO in the combustion flue gas is used only for monitoring because it acts as a cause of human harm and deterioration of combustion efficiency.
환원 분위기 유지가 목적인 연소 설비(소둔로 계열)의 경우는 복사관을 이용한 간접가열방식을 택하고, 분위기 가스는 수소 혹은 질소만으로 이루어진 환원 분위기 가스를 이용하며, 환원 분위기의 정도를 판단하기 위해서 이슬점 측정기(hygrometer)를 이용하여 환원 분위기 상태를 판단한다.(도 1 참조)In the case of combustion equipment (annealing furnace series) for the purpose of maintaining a reducing atmosphere, an indirect heating method using a radiant tube is used, and the atmosphere gas uses a reducing atmosphere gas composed of only hydrogen or nitrogen, and the dew point is used to determine the degree of the reducing atmosphere. The reducing atmosphere is determined using a hygrometer (see FIG. 1).
이를 근거로 수소의 공급량을 제어하는 방식으로 관리하는 것(도 1)이 일반적이고, 직접 연소의 경우도 연소 배가스의 이슬점을 측정하여 공연비를 제어하는 방법을 이용할 수 있다. On the basis of this, it is common to manage hydrogen supply in a manner of controlling the supply amount (FIG. 1), and in the case of direct combustion, a method of controlling the air-fuel ratio by measuring the dew point of the combustion exhaust gas may be used.
환원 정도를 판정하는 것은 분위기 온도에서 발생 가능한 산화물들의 산화/ 환원 평행 곡선(도 2 참조)에서 환원쪽으로 치우치게 관리하는데 필요한 이슬점을 찾고 그 이슬점보다 낮게 분위기가 관리되도록 한다. Determining the degree of reduction finds the dew point required to manage towards the reduction in the oxidation / reduction parallel curve of oxides that can occur at ambient temperature (see FIG. 2) and allows the atmosphere to be managed below that dew point.
이러한 이슬점 기준 관리는 챔버가 소규모이고 온도가 균일한 시스템에서는 유효하나 가열 챔버가 크고 온도가 균일하지 않은 조건에서는 특정 위치의 이슬점 측정의 샘플링 홀을 통한 일부 분위기 가스를 기준으로 평가하는 것은 많은 오차를 가질 수 있다.This dew point reference management is valid for systems with small chambers and uniform temperatures, but under conditions of large heating chambers and uneven temperatures, evaluating the reference to some ambient gas through the sampling hole of the dew point measurement at a specific location is more error prone. Can have
특히 산화, 환원 분위기를 동시에 제어하여야 하는 시스템에서 제어용으로 CO2를 사용하는 시스템에서 환원 분위기의 정도를 판단하기 위해서는 추가적으로 환원가스 성분을 계측하여야 가능한 경우가 발생한다.In particular, in a system in which oxidation and reducing atmospheres are to be controlled at the same time, it is possible to additionally measure reducing gas components in order to determine the degree of reducing atmosphere in a system using CO 2 for control.
상술한 바와 같은 문제점을 해결하기 위해, 본 발명의 목적은 산화/환원 분위기 동시 제어시스템(특히 CO2는 제어용으로 이용하는)에서 광학식 CO센서를 활용하여 분위기의 환원성을 직접 평가하는 방법을 제공하는 것을 목적으로 한다. In order to solve the above problems, it is an object of the present invention to provide a method for directly evaluating the reducing property of the atmosphere by using an optical CO sensor in a simultaneous control system for oxidation / reduction atmosphere (especially CO 2 is used for control). The purpose.
또한, 본 발명은, CO2 농도 기반의 분위기 자동 제어 시스템에서 CO를 추가적으로 측정하여 분위기의 산화 환원 정도(레벨)를 평가하도록 하는 CO 농도 측정 시스템을 이용한 산화 환원 분위기 제어 방법을 제공하는 것을 목적으로 한다. In addition, an object of the present invention is to provide a method for controlling redox atmosphere using a CO concentration measuring system for additionally measuring CO in an atmosphere automatic control system based on CO 2 concentration to evaluate the degree of redox (level) of the atmosphere. do.
상술한 바와 같은 문제점을 해결하기 위해, 본 발명의 CO 농도 측정 시스템을 이용한 산화 환원 분위기 제어 방법은, 가열로 내부 CO 농도를 측정하는 단계; 상기 측정된 CO 농도를 CO2 농도와 연계하여 산화 환원 분위기 평가를 하도록 하는 단계; 분위기 제어 시스템에서 CO 측정치를 추가 측정하는 단계; 및 산화분위기에서 완전연소가 유지되도록 하는 에어 리드(Air lead) 로 제어되고, 환원 분위기에서 환원성 유지를 하도록 하는 연료 리드(Fuel lead) 로 제어되도록 구성하는 것을 특징으로 한다.In order to solve the problems described above, the redox atmosphere control method using the CO concentration measuring system of the present invention, the step of measuring the CO concentration in the furnace; Assessing a redox atmosphere by linking the measured CO concentration with a CO 2 concentration; Further measuring the CO measurement in an atmosphere control system; And controlled by an air lead to maintain complete combustion in the oxidizing atmosphere, and controlled by a fuel lead to maintain reducing in a reducing atmosphere.
본 발명에 따르면, CO 추가 측정치를 이용하는 CO2 기반의 산화/환원 분위기 뿐만 아니라 CO 측정치의 기반으로 환원 레벨을 얻을 수 있는 효과가 있다.According to the present invention, there is an effect of obtaining a reduction level based on CO measurement as well as CO 2 based oxidation / reduction atmosphere using additional CO measurement.
이하, 도면을 참조하여 CO 농도의 추가 측정을 이용한 산화 환원 동시 제어 시스템 및 방법에 대하여 상세히 설명하도록 한다. Hereinafter, a redox simultaneous control system and method using additional measurement of CO concentration will be described in detail with reference to the accompanying drawings.
도 3은 본 발명에 따른 Fe 의 산화 환원 평행곡선을 나타내는 도면이고, 도 4는 CO2와 CO의 비율 연산에 필요한 신호들을 나타내는 도면이고, 도 5는 본 발명에 따른 CO2/CO 기반 산화/환원 동시 제어 구성도를 나타내는 도면이다. 3 is a diagram showing a redox parallel curve of Fe according to the present invention, FIG. 4 is a diagram showing signals required for calculating a ratio of CO 2 and CO, and FIG. 5 is CO 2 / CO based oxidation / It is a figure which shows a reduction simultaneous control block diagram.
상기 도 3 내지 도 5에 도시된 바와 같이, CO 농도의 추가 측정을 이용한 산화 환원 동시 제어 시스템 및 방법은, 일반적인 철강 공정의 재가열로(reheating furnace)에서는 철산화물(FeO)의 생성 여부가 산화 환원의 판단 기준으로 이용되고, 그 산화 특성은 Fe 산화/환원 평행 곡선(도 3참조)에서 CO2/CO의 비율값에 따른 온도의 함수로 확인 가능하다.3 to 5, the simultaneous redox control system and method using an additional measurement of the CO concentration, in the reheating furnace of a general steel process whether or not the production of iron oxide (FeO) is redox It is used as a criterion of, and its oxidation characteristic can be confirmed as a function of temperature according to the ratio of CO 2 / CO in the Fe oxidation / reduction parallel curve (see FIG. 3).
즉, 가열로의 분위기 온도가 1300℃ 까지 도달하는 경우의 CO2/CO는 약 0.3 이하를 유지해야 한다는 사실을 도 3을 통하여 판단할 수 있다. That is, it can be determined through FIG. 3 that CO 2 / CO should be maintained at about 0.3 or less when the ambient temperature of the heating furnace reaches 1300 ° C.
제어 시스템에서 계측되는 CO2의 농도를 항상 검출 가능하다고 봄으로 광학 식 CO농도 측정 시스템의 추가 설치(도 4 참조)로 그래프의 평행 곡선(도 3 참조) 이하를 유지하도록 제어 loop를 구성하는 것으로 원하는 목적을 달성할 수 있다. It is assumed that the concentration of CO 2 measured by the control system is always detectable, and the additional installation of the optical CO concentration measurement system (see FIG. 4) is configured to maintain the control loop to keep the graph below the parallel curve (see FIG. 3). The desired purpose can be achieved.
제어계의 CO2측정치와 추가 설치한 CO의 측정치를 근거로 환원제어 유지 제어가 가능하다. Reduction control maintenance control is possible on the basis of the measured CO 2 value of the control system and the additional measured CO value.
도 5는 상기와 같은 신호를 기반으로 산화/환원 분위기를 자동 제어하기 위한 시스템 구성도를 SAMA(Scientific Apparatus Makers Association)법을 기준으로 도시한 도면으로, 상기 도 5의 CO 에 근거한 산화, 환원 분위기 제어 구성도를 보면, 현재의 공정치 출력 산소농도(배가스의 산소농도(flue O2 PV치, 110)가 계측되어 O2제어기(120)로 전달되고, 제어는 환원 분위기와 산화 분위기를 사용자의 모드선택(환원:??1,산화:+1)에 따라 결정되고, 절환은 f1의 선형 절환함수에 의해 부드럽게 절환가능하게 되고(310), limiter값들도 f2 함수에 의해서 부드럽게 변화되어 구성된다.(320) FIG. 5 is a diagram illustrating a system configuration for automatically controlling an oxidation / reduction atmosphere based on the above signal based on the SAMA (Scientific Apparatus Makers Association) method. Based on the oxidation and reduction atmosphere control scheme based on the current process value , the output oxygen concentration (flue O 2 PV value 110 of exhaust gas) is measured and transmitted to the O 2 controller 120, and the control is performed with the reducing atmosphere. The oxidation atmosphere is determined by the user's mode selection (reduction: ?? 1, oxidation: +1), switching is smoothly switchable by the linear switching function of f1 (310), and limiter values are smoothed by the f2 function. It is changed and configured. (320)
f3는 산화 분위기에서는 완전연소가 유지되는 것을 우선하는 Air lead 제어와 환원 분위기에서는 환원성 유지가 우선하는 Fuel lead 제어가 동시에 가능하도록 한다.(330)f3 allows simultaneous control of air lead, which prioritizes complete combustion in an oxidizing atmosphere, and fuel lead control, which preferentially maintains reducibility in a reducing atmosphere (330).
이상에서 설명한 본 발명은 전술한 발명의 상세한 설명 및 첨부된 도면에 의하여 한정되는 것은 아니고, 하기의 특허청구범위에 기재된 본 발명의 사상 및 영역으로부터 벗어나지 않는 범위 내에서 해당 기술분야의 당업자가 다양하게 수정 및 변경시킨 것 또한 본 발명의 범위 내에 포함됨은 물론이다.The present invention described above is not limited to the above-described detailed description of the invention and the accompanying drawings, and those skilled in the art can be variously modified without departing from the spirit and scope of the present invention described in the claims below. Modifications and variations are also included within the scope of the invention.
도 1은 종래의 환원 분위기 제어 구성도.1 is a conventional reducing atmosphere control configuration diagram.
도 2는 종래의 산화/환원 평행 곡선을 나타내는 도면. 2 shows a conventional oxidation / reduction parallel curve.
도 3은 본 발명에 따른 Fe 의 산화 환원 평행곡선을 나타내는 도면.Figure 3 shows a redox parallel curve of Fe according to the present invention.
도 4는 CO2와 CO의 비율 연산에 필요한 신호들을 나타내는 도면.4 is a diagram showing signals required for calculating a ratio of CO 2 to CO.
도 5는 본 발명에 따른 CO2/CO 기반 산화/환원 동시 제어 구성도를 나타내는 도면. 5 is a view showing a schematic diagram of CO 2 / CO-based oxidation / reduction simultaneous control according to the present invention.
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