• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국제학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.115-120
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• 1993

It is difficult to establish a mathematical furnace model and automatic-fumace control because of the difficulty in direct measurement of the inner condition of a blast furnace. To solve this problem, we has developed and actually operated a blast furnace operation control system using artificial intelligence tool to be applied to the blast furnace process computer system. Since this system has a function of automatic Treat level control, higher practicality has been proved than the previous guidance-level expert system. This paper introduces an outline of the system and the result of application.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 춘계 학술논문 발표대회
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• pp.49-51
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• 2012

This study was conducted as a part of database construction for development of CO₂ assessment system for concrete to assess CO₂ emissions and analyze characteristics of blast furnace slag manufactured in Korea through life cycle assessment method. For this, life cycle CO₂ emissions assessment technique for construction materials was examined. The entire manufacturing process for blast furnace slag was analyzed on blast furnace slag manufacturer in Korea for application of assessment technique. Life cycle CO₂ assessment was performed on blast furnace slag after classifying assessment process into raw material production step, raw material transportation step and construction material manufacture step.

• 한국건설순환자원학회논문집
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• 제5권4호
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• pp.414-420
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• 2017

이 연구에서는 고온의 태양열 에너지를 저장하기 위한 고로슬래그 콘크리트의 열역학적 특성을 파악하였다. 고로슬래그 콘크리트의 열역학적 특성에 미치는 영향을 파악하기 위한 실험연구를 수행하였다. 실험변수로써 고로슬래그 함유량과 물-바인더 비를 고려하였다. 고로슬래그 콘크리트의 역학적 특성으로써 열사이클 전과 후의 압축강도 및 인장강도를 측정하고, 열적 특성으로써 열전도율과 비열을 측정하였다. 고로슬래그를 포함한 콘크리트의 열싸이클 적용 후의 잔류압축강도가 고로슬래그를 포함하지 않은 콘크리트의 잔류압축강도보다 크다. 또한, 고로슬래그를 혼입한 콘크리트의 열전도율이 고로슬래그를 포함하지 않은 콘크리트의 열전도율보다 더욱 크다. 이는 고로슬래그 콘크리트가 열에너지의 축열과 방열에 효과적인 것을 나타낸다. 실험연구 결과는 콘크리트 열저장 축열 모듈 설계에 효율적으로 활용될 수 있다.

• 한국세라믹학회지
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• 제44권9호
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• pp.477-482
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• 2007

The effect of the mixing ratio of compounds in a slag-OPC-Gypsum system on the physical properties of Slag cement is investigated in this study. $Na_2SO_4$ was used as an alkali activator. Blast furnace slag cement was prepared from a mixture of blast furnace slag, ordinary Portland cement and anhydride gypsum. The fluidity and the compressive strength according to the ratio of each mixture were analyzed in statistical analyses in order to discover the parameters influencing the fluidity and compressive strength. The results showed that the hydration of blast furnace slag took place with the addition of $Na_2SO_4$ and that column-crystalline ettringite was created as the main hydration product of the blast furnace slag. In addition, it was found that the compressive strength of blast furnace slag cement tends to increase when the ordinary Portland cement content is higher up to three days. However, it is known that the compressive strength tends to increase as the blast furnace slag content becomes higher with increases in the level of OPC after 28 days. As a result of this analysis, it is believed that the ordinary Portland cement content influences the initial compressive strength of blast furnace slag cement, and that in later days this is highly influenced by the slag content.

• 자원리싸이클링
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• 제18권3호
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• pp.42-48
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• 2009

고로 수쇄 슬래그에 알칼리 자극제(NaOH+$Na_2O.SiO_2$)를 첨가한 계는 보통 포틀랜드 시멘트의 수화반응과 다르게, 수화반응 초기에 높은 농도의 $OH^-,\;[SiO_4]^{4-}$ 이온이 존재하게 되므로, 유도기가 없이 수화반응이 빠르게 진행되며, 슬래그 입자 주위에 수화물에 의한 reaction rim을 형성한다 반응기간 1일부터 고로 수쇄 슬래그 입자 주위에 $0.6{\mu}m$의 reaction rim이 형성되었고, 반응기간이 증가함에 따라 reaction rim의 두께는 증가하여 28일에 $1{\mu}m$으로 성장하였으며, 미반응 고로 수쇄 슬래그 입자는 각진 형태에서 구형의 형태로 변화되었다. 슬래그 입자의 내부로부터 reaction rim으로 갈수록 Ca/Si의 몰비는 감소하는 경향을 나타냈었다. 그리고 반응기간이 경과할수록 슬래그 입자 내부와 reaction rim간의 Ca/Si 몰비 차이는 작아졌으며, 생성된 수화물은 저결정성의 Ca/Si 몰비가 1.5 미만인 CSH(I)이었다.

• 센서학회지
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• 제21권1호
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• pp.75-81
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• 2012

Optimizing the tapping time of a blast furnace is important to a stable operation and life extension. To optimize the tapping time of the blast furnace, the location of Hearth Liquid Level should be recognized. There are several ways to measure the hearth liquid level in the blast furnace, such as Electromotive Force(EMF) measurement, pressure measurement by putting in nitrogen probe and manometry with strain gauge. In this paper, it will be discussed using strain gauge among the three methods. Conventional strain gauge must be revised periodically. Since, internal pressure, temperature of internal refractory material and wind pressure have effect on the strain gauge. However, static pressure value is required to compensate. To solve these problems, this paper suggests finding relationship between Hearth Liquid Level and strain gauge output, adding digital filter in strain gauge. Using the proposed method, it was possible to estimate the hearth liquid level and determine the appropriate tapping time. Usefulness of the proposed method through simulations and experimental results are confirmed.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2005년도 창립60주년 기념 추계 학술대회
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• pp.38.2-38.2
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• 2005

• 제어로봇시스템학회논문지
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• 제3권3호
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• pp.318-322
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• 1997

A prototype of combustion zone monitoring system as been developed and installed into tuyeres of the blast furnace. The system consists of CCD(charge coupled device) cameras, sonic flow meters, an image processor and a personal computer. The personal computer collects raceway luminance data and operational data from the image processor that is connected to the color CCD camera from the blast furnace process computer, respectively. In addition, the sonic flow meters supply coal injection rate data to the personal computer. Then, the personal computer evaluates the combustion conditions with the raceway inspection algorithm. This integrated monitoring system allows us to detect abnormal raceway conditions and the clogging status of coal injection pipe. The image processing techniques of the system enable us to effectively monitor unburnt coal sticking to tuyere tip and injection lance wear conditions. Such a developed system ensures rapid and precise raceway inspection. The image processing capability of the system has helped operator to early detect both the unburnt coal sticking problem and the errosion problem of injection lance. Furthermore, the system could control the abnormal raceway condition based the the analysis results obtained from combustion monitoring.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회B
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• pp.3163-3168
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• 2008

Pulverized coal (PC) has become an important auxiliary fuel in the iron and steel industry since the technique of pulverized coal injection (PCI) system was developed for iron making. Combustion efficiencies of pulverized coal in blowpipes and tuyeres under various operational are numerically predicted to recognize the performance with the locations of nozzles in a blast furnace. A variety of parameters including the pulverized coal quantities, oxygen amounts, inlet temperature of the tuyeres and mass flow rate of coal carrier gas are taken into consideration. Also In order to develop more efficient than existing coal injection system, this study applies a flame measurement system using a charge couple device (CCD) camera and frame grabber. And it has used algorithms of auto sampling from flame shape information and composed the device for location control of PCI. This study find to further improve the blast furnace performance by the control of PCI locations.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 봄 학술논문 발표대회
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• pp.62-63
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• 2020

In this study, fundamental properties of high strength concrete containing blast furnace slag are investigated analyzed according to CBS-Dust replacement rate. As the CBS-Dust replacement rate increased, air content, fluidity and strength decreased, but concrete with 5~10 % of CBS-Dust showed excellent compressive strength in its early age. Therefore, 5~10 % substitution of CBS-Dust on high strength concrete containing blast furnace slag will have a positive effect on reducing waste disposal cost and improving the strength.