유기성폐기물을 이용한 bio-SRF제조 및미분탄과 혼합연소에 관한 연구

Abstract

Bio-SRF (Solid Refuse Fuel) pellets was manufactured, in which three types of biomass wastes, i.e., paper sludge, wastecoffee ground, and waste wood, were chosen as the raw material and pelletized with several mixing recipes. Physicochemical analysisshowed that coffee ground has a high calorific value of 5,800 kcal/kg, which is approximately 50% higher than normal wood. Thehigher heating value of paper sludge has a wide range from 2,000 to 4,000 kcal/kg according to its generation source company. Themore 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 wereco-combusted with a 3~4% mixing ratio of total fuel in a 500 MW commercial pulverized-coal power plant for twelve hourscontinuously 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 pollutantconcentrations, such as NOx, SOx, and dust, in the emission stack were similar to the only coal combustion condition.