Use of Waste Oils to Improve Densified Refuse Derived Fuels. Final Report

摘要

The preparation and properties of densified refuse-derived fuel (d-RDF) had previously been studied. The objectives of this study were the reduction of the power consumption and increase in the throughput of the densifier, increase in the calorific value and of the resistance of the d-RDF to weathering during outdoor storage. It was believed that these objectives might be achieved by adding waste oils to RDF just before densification. The majority of such oil from local sources includes spent crankcase oils with a high content of lead. In the work reported here, office wastes were shredded, air classified, and reshredded prior to feeding to an animal feed densifier. Water was added to the densifier feed in order to investigate a range of moisture contents. Waste oil (from a local dealer) was pumped through spray nozzles onto the densifier feed at controlled flows so as to investigate a range of oil contents. It is observed that over the practical range of waste oil contents, the savings in power consumption with increasing oil content are small. The addition of waste oil (up to 15 wt %) to the feed did not cause noticeable improvements in throughput rates. As expected, the calorific value of the fuel increases in proportion to the amount of waste oil. Pellets containing 13 wt % oil resulted in having a 20% higher calorific content. Increased waste oil levels in RDF led to reduction in pellet lengths and densities. The addition of waste oil to RDF did not improve pellet water repellency. (ERA citation 06:002137)