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NTIS 바로가기資源리싸이클링 = Journal of the Korean Institute of Resources Recycling, v.26 no.2, 2017년, pp.71 - 79
Circulating fluidized bed combustion (CFBC) ash is one of useful mineralogical resources having abundant content of free lime and anhydrite, and has a self-cementitious property. Recently, considerable interest has been gained regarding the utilization of CFBC ash, along with its use in mine backfil...
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
석탄재란? | 순환유동층(CFBC) 보일러 방식의 석탄화력발전소에서 발생하는 석탄재는 유리 석회와 무수석고의 함량이 풍부하고 자경성을 가지는 것을 특징으로 하는 물질로서 유용하게 활용해야 할 자원 중 하나이다. 최근 CFBC 석탄재를 포함하여 석탄화력발전소 부산물을 활용한 광산 채움 기술 및 광해 관리에 대한 관심이 점차 증가하고 있는 가운데, CFBC 석탄재를 광산 채움 분야에 적용하기 위해서는 기술에 대한 검토와 함께 관련 규격에 대해 향후 충분히 논의를 거쳐야 할 여지가 있다. | |
CFBC 보일러가 점차 증가하는 이유는? | 우리나라를 비롯하여 전세계에서는 그 동안 미분탄 연소방식(Pulverized coal combustion, 이하 PCC)의 화력발전이 주를 이루었으나, 최근 들어 순환유동층 방식(Circulating fluidized bed combustion, 이하 CFBC)의 보일러가 다수 건설되어 운영되고 있다. CFBC 보일러는 고체 입자를 유동화하여 연소하는 방식으로 우수한 연소 효율과 낮은 환경 부하의 이점으로 청정 화력발전으로 인식되고 있으며, 그 결과 전세계에서 차지하는 비율은 점차 증가하는 추세에 있다1). PCC 방식의 발전소에서 발생하는 석탄재는 대표적으로 비산재와 바닥재로 구분할 수 있으며 각각 70~90%, 10~30%의 발생량을 차지한다2-4). | |
CFBC 보일러에서 사용되는 석탄재의 문제점은? | CFBC 석탄재가 가진 자경성은 이 물질이 시멘트계 재료로 수월하게 재활용될 수 있는 가능성이 있는 것으로 보일 수 있으나, 기존 연구결과에서는 많은 문제점이 지적되었다. 대표적으로, CFBC 석탄재는 물과 함께 격렬한 발열 반응을 일으키며, 경화과정에서 발생하는 높은 팽창성과 경화된 후 CFBC 석탄재로부터의 고알칼리성 침출수가 문제가 된다20-22). 또한 구형으로 상대적으로 입도분포가 좁은 PCC 석탄재와 달리 CFBC 석탄재는 형상이 불규칙하고 거칠며 넓은 입도분포를 가지고 있어혼화재로 사용할 경우 콘크리트의 품질 관리가 용이하지 않기 때문에 주의할 필요가 있다23,24). 이 외에도 CFBC 석탄재의 높은 SO3 함량으로 인하여 포틀랜드 시멘트의 혼화재로 사용하기에는 KS, ASTM과 같은 표준 규격을 만족하지 못한다25). |
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