In this work, we report test results for direct melting of non-combustible wastes by using a 100 kW class transferred type plasma torch. For this purpose, non-combustible wastes consisting of metals and sands were prepared, weighed and melted by a transferred arc in a ceramic crucible with inner diameter of 150 mm. Test results reveal that 75wt% M6 iron bolts mixed with 25wt% sands were completely melted down within 140 seconds at the plasma power level of 83.8 kW, producing melting speed of 100 kg/hr and volume reduction rate of 62.8%. In addition, for simulated wastes consisting of 77.3wt% metal chips and 22.7wt% sands, the volume reduction rate high than 88% was achieved at 50 kW plasma power. These results indicate that non-combustible wastes can be treated efficiently when directly melting them by using transferred type plasma torch.

In this work, we report the basic performance of a 100 kW class mobile plasma melting system consisting of two 24-ft commercial containers, each in charge of the plasma utilities and melting process. In this system, a 100 kW class transferred type plasma torch has been installed together with a crucible having an inner volume of 2,884 cm3. Filling the inner volume of the crucible with the simulated metal waste, such as bolts and nuts, melting tests have been carried out for 5 min by varying plasma input power from 50 kW to 100 kW. By measuring the volume of metal waste before and after melting test, then, the volume reduction rates were estimated and discussed.

In this work, we introduce a 100 kW class mobile plasma melting system designed for non-combustible radioactive wastes treatment. To ensure mobility, the designed system consists of two 24-ft commercial containers, each in charge of the plasma utilities and melting process. In the container for plasma utilities, a 100 kW class DC power supply is installed together with a chiller and gas supply system whereas the container for melting process has a transferred type arc melter as well as off-gas treatment system consisting of a heat exchanger, filtrations, scrubber and NOx removal system. As a heat source for a transferred type arc melter, we adopted a hollow electrode plasma torch with reverse polarity discharge structure. Detailed design for a 100 kW class mobile plasma melting system will be presented together with the main specifications of the components. In addition, the basic performance data of the melting system is also presented and discussed.

필로티 공간은 일반적인 건축부재와 달리 부재가 외기와 접해 있고 실내에서 발생 가능한 화재와 가연물의 종류 및 배치 등이 달라 다양한 화재의 위험으로부터 노출되어 있다. 필로티 구조는 기둥으로만 이루어진 사방이 트인 구조로 인해 화 재가 발생할 경우 화재피해를 입은 기둥은 강도 및 강성이 저감되고 부재의 저항성이 저하되므로 단시간 안에 온도가 상승하여 구조체에 영향을 미친다. 이러한 문제점이 발생한다면 건축물 파손으로 인해 피난로를 차단당하여 많은 인명피해가 일어날 것 으로 사료된다. 본 연구에서는 다가구주택의 필로티 공간에서 화재 발생으로 인해 철근콘크리트 기둥에 미치는 화재영향을 확 인하고자, 기둥 국부화재실험을 통해 보강재에 따른 RC 기둥의 온도분포 및 파괴양상을 검토하였다.

In this study, the use of natural raw material and an inorganic binder such as vermiculite, perlite board prepared by using the inorganic was to prepare a switchboard casing. The characteristics of the basic physical properties such as compression strength of a board made of the inorganic material to the pre-study evaluation therefor.