Development of a Processing System of Automobile Shredder Residues for Solid Fuel Using a Vertical Zig-zag Air Separator and a Rotary Drier

摘要

In Japan, the automobile production is increasing from year to year, proportionally to the economic growth. The increase in the number of newly automobiles put into circulation is followed by a larger amount of discarded automobiles. The huge amount of residues generating through this processing is usually dumped on land filling sites. The accumulation of these residues and the shortage of valuable disposal sites may cause some social and environmental problems (soil pollution). To deal with this nuisance, the authors have initiated and developed a processing system for shredded automobile residues on the basis that more than 90 percent of these residues are combustible materials that could be used as solid fuel: cotton and sponges (40.1 percent), plastics (30.2 percent) and rubbers (21.2 percent). The developed processing system is applied to residues in the range of -80+5 mm. light materials, mainly cotton and sponges and light plastics in the shredded residues are recovered as float products from the ascending airflow passing through a vertical zig-zag air separator. Then moisture content of light materials is reduced to less than 15 percent at 450-550 deg C. Afterward, they are processed into solid fuel through agglomeration. The calorie, ignition loss and weight percentage of chlorine are 5,000 kcal/kg, 36.0 percent, and 2.0 percent, respectively.