| OCR Text |
Show required, a compromise must be made between a coal particle size distribution that provides high stability or one that provides maximum solids content. PRODUCTION Most Co-AL material has been produced with a batch ball milling process. Some development work has been done on a continuous production process, but no significant amount of Co-AL material has been produced continuously. The Kennedy Van Saun Corporation of Danville, Pennsylvania, has a contract to develop a pilot-scale (approximately 500 lb/hr) continuous Co-AL production system. Enough preliminary information has been collected to begin the design of a 500,000 ton/yr commercial production plant. Co-AL production currently supplies fuel for additional combustion, pumping, and handling tests at the B&W Alliance Research Center. Larger quantities, sufficient for industrial-scale demonstrations, are scheduled for early 1982. COMBUSTION Several series of Co-AL combustion tests were performed at the B&W Alliance Research Center late last year. The tests demonstrated the feasibility of burning Co-AL material directly in conventional liquid-fuel handling and combustion equipment. Only minor burner modifications and developments were made to optimize burner performance and combustion efficiency. Burner changes ( included using a dual-fluid atomizer modeled after one developed by B&W for high solids liquors and for handling limewater slurries in S0p scrubbers. Air was the atomizing medium during all testing. The standard burner flame stabilizer was modified slightly to improve fuel/air mixing. Figure k illustrate the l/25th scale oil burner utilized. All combustion tests were performed in B&W's Basic Combustion Test Unit (BCTU) illustrated in Figure 5. Its combustion chamber is of cylindrical geometry - k% ft. in diameter by 8 ft. long. The chamber has a water-jacket and is lined with 1-inch thick refractory over approximately 50% of its internal surface area. The particular configuration of the refractory, consisting of alternating strips of refractory and bare metal wall, closely matches heat removal rates of larger utility or industrial boilers. After passing through the combustion chamber, three banks of water cooled tubes cool the hot stack gases. A large drum, mounted over the furnace, supplies water to the tubes and the water-jacketed combustion chamber walls. The steam produced by the unit is simply exhausted to the atmosphere. 13-5 |
