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다단 회전식 열풍 건조기에서 커피찌꺼기의 최적 건조 조건에 관한 연구
정연우,최연석,최상규,한소영,응웬 반 꾸잉 한국폐기물자원순환학회 2020 한국폐기물자원순환학회지 Vol.37 No.7
The drying process is essential to remove the water content of waste to enhance the calorific value of the producedfuel. Even with the development and enhancement of the waste-to-heat technology highly encouraged, the current domesticdryer development capability is still insufficient not only in the design but also in the operation. Therefore, research orinvestment in the development of highly efficient dryers is required. In this study, a multi-stage rotary dryer was usedto dry coffee ground waste, which is supplied at a rate of 110kg/ hr. Various operation parameters were tested such asdrum speed, recirculation rate of exhaust gas, and temperature of exhaust gas. Results suggest that a drum speed of 0.4rpm, an exhaust gas recirculation rate of 73%, and an exhaust gas temperature of 128oC were the optimum conditionsto minimize the water content in coffee ground waste.
유기성폐기물을 이용한 bio-SRF제조 및 미분탄과 혼합연소에 관한 연구
최연석(Yeonseok Choi),최상규(Sangkyu Choi),김석준(Seockjoon Kim),정연우(Yeonwoo Jeong),한소영(Soyoung Han) 한국신재생에너지학회 2018 신재생에너지 Vol.14 No.3
Bio-SRF (Solid Refuse Fuel) pellets was manufactured, in which three types of biomass wastes, i.e., paper sludge, waste coffee ground, and waste wood, were chosen as the raw material and pelletized with several mixing recipes. Physicochemical analysis showed that coffee ground has a high calorific value of 5,800 kcal/kg, which is approximately 50% higher than normal wood. The higher heating value of paper sludge has a wide range from 2,000 to 4,000 kcal/kg according to its generation source company. The more waste coffee ground was used, the weaker strength of the bio-SRF pellet. To manufacture a strong bio-SRF pellet, less than 50% waste coffee ground was desirable in its ingredient recipe. Three types of bio-SRF manufactured with different recipes were co-combusted with a 3~4% mixing ratio of total fuel in a 500 MW commercial pulverized-coal power plant for twelve hours continuously to assess its possibility as a renewable fuel. The data showed that the boiler performance, such as the generated power, carbon residue in bottom ash, and pressure stability in the coal mill, were maintained in the normal state and the air pollutant concentrations, such as NOx, SOx, and dust, in the emission stack were similar to the only coal combustion condition.