• Title/Summary/Keyword: Induction cold crucible melter

Search Result 14, Processing Time 0.03 seconds

Characterization of Glass Melts Containing Simulated Low and Intermediate Level Radioactive Waste

  • Jung, Hyun-Su;Kim, Ki-Dong;Lee, Seung-Heon;Kwon, Sung-Ku;Kim, Cheon-Woo;Park, Jong-Kil;Hwang, Tae-Won;Ahn, Zou-Sam
    • Journal of the Korean Ceramic Society
    • /
    • v.43 no.3 s.286
    • /
    • pp.148-151
    • /
    • 2006
  • In order to examine the process parameters for the vitrification of Low and Intermediate Level radioactive Waste (LILW) generated from nuclear power plants, measurements of several melt properties was performed for four selected glasses containing simulated waste. Electrical conductivity and viscosity were determined at temperatures ranging from 1123 to $1673^{\circ}C$. The temperature dependences of both properties in the molten state showed a similar behavior in which their values decrease as the temperature increases. The values of the electrical conductivity and viscosity at a temperature of 1423K adopted in an induction cold crucible melter process were $0.27{\sim}0.42$ S/cm and $9.8{\sim}42$ dPas, respectively.

The Study on the Power Consumption for Glass Melting by Cold Crucible Melter (CCM용융에 대한 유리용융 조건 연구)

  • Jin, Hyun-Joo;Lee, Kyu-Ho;Jung, Young-Jae;Bae, So-Young;Kim, Tae-Ho;Jung, Young-Joon;Kim, Young-Seok;Lee, Kang-Taek;Ryu, Bong-Ki
    • Korean Journal of Metals and Materials
    • /
    • v.46 no.2
    • /
    • pp.65-68
    • /
    • 2008
  • Generally CCM (cold crucible melting) is not suitable for melting glass. However, in this study we described the quantitative relationship between the basic property of glass and power balance, the power absorption in the melt, the losses in the coil and the cold crucible, for melting glass in CCM. The dependence of power balance on the applied frequency and the electric conductivity has been found. Above 300 kHz, the glass (B) contained alkali ion which has the low resistance $3.0{\Omega}{\cdot}cm$ at $900^{\circ}C$ and $1.36{\Omega}{\cdot}cm$ at $1,100^{\circ}C$ was melted easily and 60% of the overall power was absorbed in the melt and 30% and 10% of the overall power was lost in the cold crucible and coil respectively. Under the same condition, the glass (A) contained non-alkali ion was not melted easily and 50% of the overall power was absorbed in the melt and 40% and 10% of the overall power was lost in the cold crucible and coil respectively. In conclusion, the small absorbed power of the overall power in melt prevented a successful melting as for glass A, and the successful melting depends on the relative size of the absorbed power in melt irrespective of the melting volume. Hence, as typical for direct induction heating method(CCM), the successful melting strongly depended on the chosen working frequency based on electric conductivity of glass, power balance and the control of the critical power which was absorbed in melt.

Radioactive Wastes Vitrification Using Induction Cold Crucible Melter: Characteristics of Vitrified Form (유도 가열식 저온용융로를 이용한 방사성페기물 유리화: 유리 고화체 특성)

  • 김천우;박은정;최종락;지평국;최관식;맹성준;박종길;신상운;송명재
    • Journal of the Korean Ceramic Society
    • /
    • v.39 no.6
    • /
    • pp.576-581
    • /
    • 2002
  • In order to simultaneously vitrify the ton Exchange Resin(IER) and Dry Active Waste(DAW) generated from the Nuclear Power Plants, a vitrification pilot test was conducted using an induction cold crucible melter. The PCT result evaluating the chemical durability of the vitrified from showed that the final glass was more durable than the benchmark glass. Liquidus temperature for the final vitrified form was 1048 K(775$\^{C}$) fur heat treatment experiments. The value of the compressive strength for the vitrified form was ninety times higher than the regulation limit, 34 kg/㎠. The glasses on bottom, middle and top of the CCM were homogeneous with no secondary phase. The precipitation of the magnetic metal phase was able to be avoided by simultaneously fEeding of DAW with IER containing strongly reducing organics. Volume reduction factor of 74 was achieved through the vitrification Pilot test for mixed waste.

Characteristics of Vitrification Process for Mixture of Simulated Radioactive Waste Using Induction Cold Crucible Melter (유도가열식 저온용융로를 이용한 혼합모의 방사성폐기물의 유리화 공정 특성)

  • 김천우;양경화;박병철;박승철;황태원;박종길;신상운;하종현;송명재
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
    • /
    • v.2 no.3
    • /
    • pp.165-174
    • /
    • 2004
  • In order to simultaneously vitrify the ion exchange resin(IER) and combustible dry active waste(DAW) generated from Korean nuclear power plants, a vitrification pilot test was conducted using an induction cold crucible melter(CCM) . The energy necessary for startup of the glass using a Ti-ring was evaluated as about 290 kWh. The power supplied from a high frequency generator to melt the glass properly was ranged from 160 to 190 kW without any interruption. When the mixture of the IER and DAW was fed into the CCM, the concentration of CO was lowered up to 1/40 compared to feeding the IER solely. It may be caused by the DAW which can produce about 1.8 times higher heat compared to the IER. When the swelling phenomenon occurred in the glass melt, the concentration of $NO_2$, oxidizing gas, was higher than NO, reducing gas. Total feed amounts of the IER and DAW were 368 and 751 kg, respectively. And then, about 74 of volume reduction factor was achieved.

  • PDF

A Development of Technology for Low- and Intermediate-Level Radioactive Waste Treatment utilizing Induction heater and Plasma torch (플라즈마 및 전기유도가열을 이용한 중.저준위 방사물 처리기술 개발)

  • Moon, Young-Pyo;Cho, Chun-Hyung;Song, Myung-Jae;Han, Sang-Ok
    • Proceedings of the KIEE Conference
    • /
    • 1997.11a
    • /
    • pp.357-360
    • /
    • 1997
  • Currently, there is a need for the development of an advanced new technology for Low-and Intermediate-Level Radioactive Waste (LILW) treatment from nuclear power plants. The vitrification and melting technology by the use of the electrical equipments such as induction heater and plasma torch based furnace, along with off-gas treatment are considered as the most promising one of the LILW treatment technology since they can produce a very stable waste forms as well as considerably large volume reduction, which is a world-wide trend to apply for radioactive waste treatment. Korea Electric Power Research Institute(KEPRI) has already completed a feasibility study on LILW treatment and conceptual system design of a demonstration plant to be constructed. For this research, KEPRI selected a cold crucible melter(CCM) for the vitrification of combustible waste, and plasma torch based furnace(PT) for the melting of noncombustible waste, along with off-gas treatment for the volatile radioisotopes such as cesium.

  • PDF