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수분의 함량이 높은 저품위탄을 건조시키기 위하여 유중 건조 방법에 대해 조사하였다. 최적의 건조 조건을 선정하기 위하여 최종온도,석탄과 등유의 혼합비율,석탄 또는 등유의 양, 혼합물의 총량, 교반 방법에 따른 석탄의 건조 특성을 관찰하였다. 최종온도가 120℃이하일 때는 완전한 증발이 이루어지지 않았으며, 130℃ 이상인 경우에는 수분의 증발량에 큰 차이가 나타나지 않았다. 석탄과 등유의 혼합비율에서 석탄의 양이 증가 할수록 수분의 증발이 잘 이루어짐에 따라, 열에너지의 전달이 수분의 증발에 미치는 영향보다 증발한 수분이 등유 속에서 배출되기 위하여 필요한 에너지가 더 큰 것으로 나타났다. 혼합물의 총량이 많은 경우에는 건조후 의 수분 함량이 더 낮아지지만 많은 시간이 소모되는 반면, 적은 경우에는 수분 함량을 일정한 수준 이하로 낮추기 어려운 반면에 짧은 시간에 일정한 함량까지 수분을 증발시킬 수 있는 것으로 나타났다. 따라서 등유와 석탄 혼합물의 유동성이 확보되는 한도 내에서 등유의 양을 가능한 줄이는 것이 석탄의 건조에 유리한 것으로 판단되었다.한편,질소를 이용한 교반과 진공을 개별적으로 적용한 경우에는 증발량이 향상되었다.


The experimental characteristics for fry drying method was investigated using low-rank coal with a high moisture content. Final temperature, mixing ratio between coal and kerosene, content of coal or kerosene, total weight of the mixture and mixing methods were varied to find out the optimum conditions by measuring moisture of coal. Evaporation of the coal moisture was not completed below 120℃ of final temperature. The amount of moisture was not significantly different over 130℃. Coal moisture was easily evaporated by increasing coal content, which showed that the moisture evaporation could be significantly enhanced by the remove of evaporated moisture from kerosene rather than by heat transfer to the coal. High total weight of the mixture resulted in lowering moisture content of coal with long evaporation time. On the other hand, low total weight was difficult to reduce the moisture below a certain level, but could reduce evaporation time. Thus, it can concluded that kerosene content should be lowered to the extent maintaining the mobility of the mixture in order to enhance evaporation. It was also observed that evacuation and mixing by using nitrogen could improve drying of coal.


The experimental characteristics for fry drying method was investigated using low-rank coal with a high moisture content. Final temperature, mixing ratio between coal and kerosene, content of coal or kerosene, total weight of the mixture and mixing methods were varied to find out the optimum conditions by measuring moisture of coal. Evaporation of the coal moisture was not completed below 120℃ of final temperature. The amount of moisture was not significantly different over 130℃. Coal moisture was easily evaporated by increasing coal content, which showed that the moisture evaporation could be significantly enhanced by the remove of evaporated moisture from kerosene rather than by heat transfer to the coal. High total weight of the mixture resulted in lowering moisture content of coal with long evaporation time. On the other hand, low total weight was difficult to reduce the moisture below a certain level, but could reduce evaporation time. Thus, it can concluded that kerosene content should be lowered to the extent maintaining the mobility of the mixture in order to enhance evaporation. It was also observed that evacuation and mixing by using nitrogen could improve drying of coal.