A Safe Way to Clean Diesel Exhaust.
Coal Min 1987 Aug; 24(8):40-42
Diesel-powered equipment is being used increasingly in underground coal mines as operators discover its versatility. But its safe operation requires that the exhaust gases and particles be diluted to safe levels. Also, since many diesels operate in potentially gassy air, special engine controls must keep temperatures down. Good maintenance and work practices are required to minimize these dangers. To simplify this task, two promising exhaust control technologies are currently being evaluated by the U.S. Bureau of Mines, at its Twin Cities Research Center in Minneapolis, Minnesota, as well as in an actual underground coal mine. This project is being undertaken by the Bureau in cooperation with the Colorado Mining Association (CMA) and the coal industry. The integrated control system combines a diesel particulate filter with a dry exhaust conditioning system. Each of these control devices has been developed to minimize a specific industrial health or safety problem. The diesel particulate filter has been shown to reduce tailpipe particulate emissions by 90 pct, while the dry exhaust conditioning system is designed to eliminate flames and sparks in the exhaust while reducing surface and exhaust temperatures to below regulated levels. The dry exhaust conditioner has the added benefit of eliminating the need for the hard-to-maintain and costly water scrubbers that are currently in use. By combining these devices on a single diesel vehicle, it is hoped that these two major problems associated with diesels will be minimized.
Coal Min., V. 24, No. 8, Aug. 1987, PP. 40-42