• 한국세라믹학회지
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• 제44권11호
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• pp.618-621
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• 2007

In this study, flint glass batches with blast furnace slag (BFS) were prepared and the contribution of the BFS to the fining of melts was studied through investigations of the melting and fining characteristics. Additionally, a sulfur redox reaction for BFS-doped melts was examined by square wave voltammetry (SWV). The results of the melting & fining test showed that BFS improved the fining of the melts. In a voltammogram of BFS-doped melts, two reduction peaks were shown at high frequencies while only one peak appeared at low frequencies. The peaks were located at a potential that was similar to those of melts fined by sulfate. From those results it was concluded that sulfide ($S^{2-}$) in BFS has effects in glass melts that are identical to those of sulfate ($SO_4^{2-}$).

• 조명전기설비학회논문지
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• 제18권5호
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• pp.118-125
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• 2004

철강 소비가 늘어나고, 전기아크로 운영기술의 발전에 따라 아크로의 사용이 증가하고 있다. 그러나 전기아크로의 사용이 늘어날수록 계통에는 악영향을 미치게 된다. 즉, 전력품질 문제인 전압 및 전류 고조파, 상 불평형, 역률 저하, 전압 플리커 등의 문제가 발생하고 있다. 여기서는 시변 특성과 비선형 특성을 갖는 고조파에 대하여 해석하였다. 우선 전기 아크로가 포함된 전력계통 모델을 만들고, 전기 아크로의 다양한 운전 조건에 따라 발생된 고조파가 계통에 미치는 영향을 분석하였다. 또한 고조파 저감 대책으로 고조파 필터를 설계하여 그 영향을 검토하였다.

• 한국세라믹학회지
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• 제18권4호
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• pp.247-256
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• 1981

Silica bricks had been in arc-furnace roofs of various sizes and steelmaking practices. The resulting materials were examined with reference to mineral and chemical changes. Silica bricks develope definite zones while in service. These zones represent a concentration gradient through the brick that results from the thermal gradient across the brick and from the furnace atmosphere. There are major brick losses by spalling as well as by melting of the hot-face surface in an iron-oxide rich liquid.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2006년도 제32회 KOSCO SYMPOSIUM 논문집
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• pp.189-193
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• 2006

Experiments were performed to investigate the melting characteristics of pellet fuel made of LDPE and PP for a waste plastic firing boiler. Pellet fuel in a burner goes through conduction, convection and radiation transferred from flame in a furnace, and complex thermo/chemical processes. To figure out effects of ambient temperature and size of pellet on melting time pellets with a diameter from 5 mm to 40 mm were made to contact high temperature flue gas generated by a LNG firing pilot burner. Though melting processes of plastics include complicated heat transfer in a burner, parameters are limited to flue gas temperature and size for the simplicity in this study. From the results, melting times of LDPE and PP with a diameter of 5mm are 63 and 62 secs respectively at 600 $^{\circ}C$ while 677 and 583 sees respectively for a diameter of 40 mm. At $900^{\circ}C$, melting times of LDPE and PP with a diameter of 5mm are 21 and 24 sees respectively while 408 and 337 secs respectively for a diameter of 40 mm. It is found that melting time of LDPE is longer than that of PP, and melting times of both in general increase with diameter of pellets. It is thought melting is dependent mostly on melting temperature of plastic. It is expected melting times obtained from the study might be taken into account in designing a pellet firing burner for a boiler

• 한국연소학회:학술대회논문집
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• 한국연소학회 2006년도 제33회 KOSCO SYMPOSIUM 논문집
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• pp.168-174
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• 2006

A pilot scale (200kg/hr) pyrolysis melting incineration system is designed and constructed in Korea Institute of Industrial Technology. The incineration process is composed of pyrolysis, gas combustion, ash melting, gas stabilization, waste heating boiler, and bag filter. For each unit process, experimental approaches have been conducted to find optimal design and operating conditions. Especially, a pyrolysis is very important process in that it is a way of energy recirculation and minimizing the waste products. This paper presents major results of the most efficient operating conditions in a pilot scale pyrolysis melting incinerator.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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• pp.475-478
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• 2008

The 3 ton/day-scale pilot plant consists of waste press, feed channel, fixed bed type gasification & melting furnace, quench scrubber, syngas refinery facility and flare stack. $H_2$/CO ratio of gasification syngas using the solid waste and sludge in the 3 ton/day gasifier showed about 1. Gasification melting furnace was operated $1,300{\sim}1,600^{\circ}C$. $H_2$/CO ration control system was obtained $H_2$/CO ratio 2 and 3.

• 대한치과기공학회지
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• 제26권1호
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• pp.41-48
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• 2004

Ti-20%Zr(-5%Cr) alloys not containing harmful Al and V were newly designed in order to reveal their possibility for dental casting and melted in an arc melting and casting furnace under Ar atmosphere. The corrosion resistance was studied by anodic polarization test. From the observation of anodic polarization behavior, it was found that the corrosion resistance was markedly increased by the addition of Cr. The corrosion resistance of Ti-20%Zr-5%Cr alloy was superior to that in Ti-6%Al-4%V alloy but almost similar to that in CP Ti using in market place today.

• 센서학회지
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• 제18권2호
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• pp.116-121
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• 2009

Pressure-controlled sodium heat pipe furnace was designed and fabricated, and its characteristics was investigated. Pressure control system was controlled within ${\pm}0.5\;Pa$ at 150 kPa and the stability of pressure was decreased to ${\pm}2.5\;Pa$, when the pressure-controlled system connected with the heat pipe. The melting curve of Ag fixed-point realized well by the adiabatic method using the pressure-controlled sodium heat pipe furnace and its accuracy showed ${\pm}2.27\;mK$ from the calculation of 20% to 80% at the plateau. The freezing curve of Ag fixed-point also realized and its plateau value was 2.23 mK lower than that of the melting curve.

• Korean Chemical Engineering Research
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• 제46권2호
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• pp.340-347
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• 2008

용해공정의 경우, 용해물을 균일한 상태로 유지하고 용해로에 투입되는 연료의 연소상황을 분석하기 위해 폐가스 유속을 측정한다. 현재 시중에 많은 종류의 기체유속 측정장치들이 있지만, 용해공정에서 발생하는 폐가스는 고온이고, 저속이며, dust를 많이 갖고 있어 기존의 측정장치들은 이런 조건에 적합하지 않다. 따라서 저속에 반응할 만큼 충분히 정밀하고 고온에 견딜 수 있는 새로운 방식의 측정장치를 제작하였다. 현장테스트 결과, 제작된 측정 장치는 유속의 작은 변화에도 반응할 정도로 충분히 민감하고 온도변화를 빠르게 감지하기 때문에 용해로의 온도제어에 도움을 줄 것으로 기대된다.

• 한국주조공학회지
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• 제14권6호
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• pp.489-494
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• 1994