Coal-Water-Slurry Autoignition in a High-Speed Detroit Diesel Engine

Clean Coal Diesel Demonstration Project

“…While these model results were in agreement with modeling work done later (13,14), some preliminary experiments reported by Kakwani (l5) indicated that much higher engine speeds appeared to be possible. These results were corroborated in a project with Detroit Diesel Corporation and SwRI (16,18,21) conducted in 1990-93 and performed a 1900-rpm Detroit Diesel 8V -149 engine used in mine haul truck applications.…”

“…The seal oil acts to lubricate the moving parts and prevent the passage of coal particles into the tight clearances. The experience at SwRI (21) and in the Arthur D. Little work (32) indicated that the seal oil must be supplied to both locations. Optimum operation of the shuttle piston is accomplished if the piston is undercut in the region where the seal oil is introduced.…”

“…Another option is air-driven intensifier pumps. Recent work at SwRI (21) indicates that air driven intensifier pumps, typically used in high pressure paint spray systems, can be configured with components designed to handle abrasive materials. A pump in this configuration has operated reliably and at much higher discharge pressures than can be achieved using a progressive cavity pump.…”

“…• With DOE support, General Electric and Cooper-Bessemer --Arthur D Little developed the necessary technology for coal-water fuel pumping, storage and injection (18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32). The same teams developed promising hard material solutions for the severe wear observed in the holes of fuel injector tips (33-40).…”

“…The work at SwRI included examination of two different pump-line-nozzle systems with increased clearances (23,24), a unit injector with increased clearance (24), a Cummins Pressure-Time system (25), a unit injector equipped with a diaphragm to separate diesel fuel and slurry inside the injector, and a pump-line nozzle system equipped with a free piston located between the nozzle and the injection, and separating the slurry from diesel fuel that is circulated through the injection pump (21) . The initial efforts at GE (26) also involved the use of a diaphragm system, as well as an accumulator system that used the diaphragm system as the pressurization system for the accumulator (27).…”