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마이크로파 가열에 의한 음식물류 폐기물, 폐플라스틱 및 무연탄의 혼합 건조특성 평가
정병길 ( Byung-gil Jung ),최병혁 ( Byoung-hyeok Choi ),김한석 ( Han-seok Kim ),고상수 ( Sang-su Ko ),김정권 ( Jung-kwon Kim ),최영익 ( Young-ik Choi ) 한국환경기술학회 2012 한국환경기술학회지 Vol.13 No.1
본 연구는 마이크로파 건조장치를 이용하여 음식물류 폐기물의 재활용 측면에서 음식물 쓰레기(70~100%), 무연탄 (0~30%), 폐플라스틱 (0~30%)의 혼합비율 및 마이크로파 단독건조방식에 따른 운전시간별 건조특성을 평가하고자 하는데 그 목적이 있다. 본 연구에 사용된 음식물류 폐기물은 B시 P사에서 채취하여 사용하였으며, 음식물류 폐기물과 가연성 물질의 균질 혼합 및 건조효율 향상을 위하여 비닐, 어패류 등 이물질을 제거하였다. 또한, 음식물류 폐기물의 건조효율 향상 및 2 mm 이하로 분쇄된 분말 형태의 저품질 무연탄 (Ac ; Anthracite coal) 및 폐플라스틱 (Wp; Waste plastics)을 혼합하여 건조실험을 실시하였다. 마이크로파 건조장치의 전체 크기는 W1,360 mm × L 1,060 mm × H 900 mm, 마이크로파 건조장치의 조사강도는 1 kW이며, 마이크로파 주파수는 2,450 MHz로 제작하였다. 음식물류 폐기물 70%에 무연탄 30%, 폐플라스틱30%을 각각 혼합하여 건조실험을 실시한 결과 마이크로파 건조를 이용한 완전건조 (함수율 10%이하)시 최종 함수율 변화는 운전시간 15분에서 각각 5.4%, 7.8% 로 나타났다. 실험결과 음식물쓰레기에 첨가물을 혼합하였을 경우, 음식물류 폐기물의 재활용 방안으로 마이크로파 공정을 이용한 고형연료의 생산이 충분히 가능할 것으로 판단된다. The main objective of this study is on the development of a method for recycling food waste by using the microwave drying process, as well as the amounts of food waste (70~100%), anthracite coal (0~30%), waste plastics (0~30%). The food waste used in this research was collected at P Company located in B City. For homogeneous mixture of food waste with combustible materials and for better drying efficiency, foreign substances which were vinyl, fish and shellfish were removed. Also, to improve drying efficiency and heating values of food waste, an experiment was carried out to dry a mixture of powder-type low-quality Ac (anthracite coal), Wp (waste plastics), all of which were ground to less than 2 mm. The size of the microwave drying unit is 1,360 mm(W) × 1,060 mm(L) × 900 mm(H), and its projection intensity and frequency were 1 kW and 2,450 MHz was designed. As a result of the experiment, the mixture of food waste (70%) with each anthracite coal (30%), waste plastics (30%) dried using the microwave drying process led to the final moisture contents of 5.4%, 7.8%, respectively, which levels were lowest for full harness (moisture content: less than 10%) and 15-min operating period. The result of an experiment, food waste mixed with other additives was found to produce In sum, as a way for recycling food waste, the microwave drying process seems capable of producing RDF to the full extent.
Ta<sub>2</sub>O<sub>5</sub> 고유전박막의 미세조직과 열적안정성
민석홍,정병길,최재호,김병성,김대용,신동우,조성래,김기범,Min, Seok-Hong,Jung, Byung-Gil,Choi, Jae-Ho,Kim, Byoung-Sung,Kim, Dae-Yong,Shin, Dong-Woo,Cho, Sung-Lae,Kim, Ki-Bum 한국재료학회 2002 한국재료학회지 Vol.12 No.10
TiN and TaN films as electrode materials of reactive sputtered $Ta_2$$O_{5}$ were prepared by sputtering to compare their thermal stabilities with $Ta_2$$O_{5}$ The microstructural change of $Ta_2$$O_{5}$ films with annealing was also investigated. As- deposited $Ta_2$$O_{5}$ film on $SiO_2$ was amorphous and annealing of 80$0^{\circ}C$ for 30 min made it transform to $\beta$-Ta$_2$O$_{5}$ crystalline which contains amorphous particles with the size of a few nm. Crystallization temperature of Ta$_2$Ta_2$$O_{5}$ on TaN is higher than that on TiN electrode. The interface between TaN and Ta$_2$O$_{5}$ maintained stably even after vacuum annealing up to $800^{\circ}C$ for 1 hr, but TiN interacted with $Ta_2$$_O{5}$ and so interdiffusion between TiN and $Ta_2$$O_{5}$ occurred by vacuum annealing of 80$0^{\circ}C$ for 1 hr. It indicates that TaN is thermally more stable with $Ta_2$$O_{5}$ than TiN.N.