Abstract
References
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Recently, imported bituminous coals used in coal-fired power plants are pulverized into finer particles in order to increase combustion efficiency. So it is difficult to obtain high grade ash. But in some plants, coarse particles are produced by cyclone reject during the classification process of fly ash. Therefore in this study, production possibilities of high grade ash were confirmed by performing an experiment using conductive induction with cyclone reject. As a result, below 1% LOI with above 80% recovery high grade ash was obtained, but in the case of unburned carbon there was a difficulty during separation due to fine particle ash inside the unburned carbon. These facts were verified by SEM microscope photographs and EDS analysis.
최근 국내 석탄 화력발전소에서 연료로 사용되는 수입유연탄은 연소효율을 높이기 위해 미분쇄를 하기 때문에 고품위석탄회를 얻는데 어려움이 따른다. 그러나 일부 발전소에서는 분급에 의한 석탄회의 정제공정에서 cyclone reject로 조립질 석탄회가 발생되고 있다. 그래서 본 연구에서는 이 reject산물을 대상으로 정전유도에 의한 선별법으로 실험을 실시하여 고품질 석탄회의 생산 가능성을 확인하였다. 실험결과 1%LOI이하의 고품위 석탄회를 80%이상의 회수율과 함께 얻을 수 있었으나 미연탄소의 경우, 미연탄소내부에 미립의 회분이 미분리상태로 들어 있어 분리에 한계가 있음을 알 수 있었으며 이는 SEM사진과 EDS분석에서도 확인되었다.
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- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean Society for Geosystem Engineering
- Journal Title(Ko) :한국지구시스템공학회지
- Volume : 45
- No :1
- Pages :25-33
Journal of the Korean Society of Mineral and Energy Resources Engineers
