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배연탈황공정에서 국내산 석회석의 물리화학적 특성이 용해속도에 미치는 영향
Effects of Physicochemical Properties of Domestic Limestones on the Dissolution Rates in Flue Gas Desulfurization Process
한국에너지기술연구원 청정에너지연구부, 대전 305-343 1건국대학교 화학공학과, 서울 143-701
Clean Energy Research Department, Korea Institute of Energy Research, Daejeon 305-343, Korea 1Department of Chemical Engineering, Konkuk University, Seoul 143-701, Korea
@
HWAHAK KONGHAK, June 2002, 40(3), 404-409(6), NONE
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Abstract
습식 배연탈황공정에서 국내산 석회석의 효율적인 활용을 도모하고 국내 배연탈황공정의 신뢰도 높은 운전과 배연탈황공정 설계기술의 기초 자료를 제공하기 위해 국내산 석회석의 물리화학적 특성이 석회석의 용해속도에 미치는 영향을 실험적으로 측정하였다. pH-stat 방법을 적용한 실험실 규모의 실험 장치를 이용하여 용해속도 측정하였으며, 기존에 사용하던 염산용액 대신에 묽은 황산용액을 산용액으로 사용하였다. 장치의 신뢰성을 확인한 후에 국내산 석회석 27종을 대상으로 각각에 대하여 4회씩 용해속도를 측정하였다. 실험 결과 본 연구에서 사용된 시료 및 실험조건하에서 석회석의 용해속도는 CaCO3, MgCO3의 함량과 같은 석회석의 화학적 조성에 의한 영향보다는 평균입자와 비표면적의 크기 등 물리적 특성에 의해 큰 영향을 받았다. 또한 석회석을 분쇄할 때 이용한 분쇄장치의 종류 및 분쇄경로에 의해서도 석회석의 용해속도는 영향을 받음을 보였다.
The evaluation of the reactivity of domestic limestones in the wet type flue gas desulfurization(FGD) process is important to maintain the performance and reliability of process, and to utilize effectively the limestone sources in Korea and provide the basic data for design of FGD process. The dissolution rates of limestones were measured using the lab scale experimental apparatus based on the pH-stat method, and diluted sulfuric acid was used as an acidic feed instead of conventional hydrochloric acid. After identifying the good reproducibility of measurements, the dissolution rates were measured 4 times for 27 limestone samples collected from 21 domestic mines, respectively. The dissolution rates of domestic limestones were more_x000D_
dependent on the physical characteristics including average particle size and specific surface area than the chemical compositions such as CaCO3 and MgCO3 contents of selected limestone samples under these experimental conditions. And the dissolution rates of limestones were affected by the physical processing of limestones including grinding methods.
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