• Proceedings of the Korean Radioactive Waste Society Conference
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• 2005.06a
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• pp.110-120
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• 2005

For utilizing vitrification to treat low and intermediate level waste, industrial pilot plant was designed and constructed in October 1999 at Daejon, Korea through the joint research program among NETEC, MOBIS and SGN. More than 70 tests were performed on simulated IER, DAW etc. including key nuclide surrogate(Cs, Co); this plant has been shown to vitrify the target waste effectively and safely, however, some dust are generated from the HTF(High Temperature Filter) as a secondary waste. In case of long term operation, it is also concerned that pipe plugging can be occurred due to deposited dust in cooling pipe namely, connecting pipe between CCM(Cold Crucible Melter) and HTF. In this regard, we have developed the special complementary system of the off-gas treatment system to recycle the dust from HTF to CCM and to remove the interior dust of cooling pipe. Main concept of the dust recycling is to feed the dust to the CCM as a slurry state; this system is regarded as of an important position in the viewpoint of volume reduction, waste disposal cost and glass melt control in CCM. The role of DRS(Dust Recycling System) is to recycle the major glass components and key nuclides; this system is served to lower glass viscosity and increase waste solubility by recycling B, Na, Li components into glass melt and also to re-entrain and incorporate into glass melt like Cs, Co. Therefore dust recycling is helpful to control the molten glass; it is unnecessary to consider a separate dust treatment system like a cementation equipment. The effects of Dust Cleaner are to prevent the pipe plugging due to dust and to treat the deposited dust by raking the dust into CCM. During the pilot vitrification test, overall performance assessment was successfully performed; DRS and Dust Cleaner are found to be useful and effective for recycling the dust from HTF and also removing the dust in cooling pipe. The obtained operational data and operational experiences will be used as a basis of the commercial facility.

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.832-835
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• 2009

폐기물의 감량화 및 자원화 기술 중 가장 대표적인 기술로 폐기물의 가스화 용융 기술을 들 수 있다. 폐기물 가스화 용융 기술은 폐기물 내의 탄소 및 수소 성분은 가스화 하여 CO, $H_2$가 주성분인 합성가스(synthesis gas, syngas)로 전환하고, 불연물은 용융하여 환경적으로 무해한 슬래그 또는 금속으로 회수하는 기술이다. 본 연구에서는 고발열량폐기물과 탈수슬러지 혼합가스화를 통하여 생산된 합성가스를 합성가스 압축기를 통하여 유용한 원료물질을 제조하는 공정인 수성가스 전환 반응(water gas shift reaction)과 가스화 반응기의 보조연료로 투입하기 위한 합성가스 압축, 이송 시스템의 운전 특성을 고찰하였다. 그 결과 고발열량폐기물과 탈수슬러지 혼합가스화에서 합성가스는 안정적으로 발생하였으며, 합성가스 압축, 이송시스템을 위한 정제설비에서의 분진제거는 99.07 %의 효율을 얻었고, 또한 합성가스 재순환 장치의 성능시험을 통하여 대기 중의 산소가 유입이 안 되는 기밀성을 확인하였다. 합성가스 압축, 이송 공급 유량 제어 실험 결과로는 합성가스 압축기 기동 시 합성가스 압축압력과 공급유량은 비례적으로 증감하는 것을 알 수 있었다.