폐기물 에너지 보일러관 표면에서의 고온부식특성 (High Temperature Corrosion Properties of Heating Surface in Waste-to-Energy Boiler Tube)

서지정보

· 발행기관 : 한국폐기물자원순환학회
· 수록지 정보 : 한국폐기물자원순환학회지 / 34권 / 1호 / 27 ~ 33페이지
· 저자명 : 방정원, 김영희, 김수룡, 신동근, 조계홍, 권우택

초록

High temperature corrosion is a major issue in waste-to-energy (WTE) facilities because it effects running cost andenergy utilization efficiency. Corrosion of heating surfaces in WTE boilers is a complex phenomenon. The purpose ofthis study was to analyze the high temperature corrosion characteristics of WTE boiler tubes and to determine theinfluences of high temperature corrosion on heat exchange. Heating surface corrosion samples for this research wereobtained from a superheater tube in municipal solid refuse fuel-fired power plant. Surface morphology, microstructureand phase composition were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, andX-ray diffraction analysis. The morphology of the heating surface was rough and had porous structures. The chlorinecontent of the surface was 7.4wt.% and the samples were mainly composed of hematite (Fe2O3) and magnetite (Fe3O4).
The thermal conductivity of the corrosion samples was characterized using thermal conductivity measurements and wasfound to be 2.33 W/mK at 500oC. This result, which is 17 times less than that of boiler tube carbon steel (40.40 W/mK),indicates that corrosion of WTE boiler tubes is closely related to a decrease in boiler heat exchange efficiency.

영어초록

High temperature corrosion is a major issue in waste-to-energy (WTE) facilities because it effects running cost andenergy utilization efficiency. Corrosion of heating surfaces in WTE boilers is a complex phenomenon. The purpose ofthis study was to analyze the high temperature corrosion characteristics of WTE boiler tubes and to determine theinfluences of high temperature corrosion on heat exchange. Heating surface corrosion samples for this research wereobtained from a superheater tube in municipal solid refuse fuel-fired power plant. Surface morphology, microstructureand phase composition were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, andX-ray diffraction analysis. The morphology of the heating surface was rough and had porous structures. The chlorinecontent of the surface was 7.4wt.% and the samples were mainly composed of hematite (Fe2O3) and magnetite (Fe3O4).
The thermal conductivity of the corrosion samples was characterized using thermal conductivity measurements and wasfound to be 2.33 W/mK at 500oC. This result, which is 17 times less than that of boiler tube carbon steel (40.40 W/mK),indicates that corrosion of WTE boiler tubes is closely related to a decrease in boiler heat exchange efficiency.

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