NIOSH 1982 Oct:120-122
The Japanese experience with using diesel engines in underground coal mines was discussed. The coal mining industry in Japan was discussed. There were very few operating coal mines in Japan because the coal seams were very deep, making the coal very difficult and expensive to extract, and there was a decreasing demand for coal. It was noted that because of this the use of diesel equipment in Japanese coal mines would be quite limited. Regulating dieselized mine equipment was discussed. Japanese regulations have been directed primarily toward preventing explosions and were developed along the lines of German regulations of several decades ago. The regulations dealing with exhaust emissions, however, have been modeled on those of the United States. Studies on reducing diesel exhaust emission from motor vehicle engines conducted by Isuzu Motors, Limited, were discussed. Laboratory testing has shown that specially designed bag filters could collect smoke, retarding the injection timing could reduced nitrogen oxides emissions, and installing an exhaust catalyst could reduce unburned hydrocarbon emissions; however, it was felt that none of these devices were practical for use on motor vehicles. The problem of irritating exhaust gas emissions that occurred during cold starts could be eliminated by applying back pressure or cutting fuel delivery to half of the cylinders. A transcript of a question and answer session was supplied.
Coal-mining; Diesel-exhausts; Diesel-engines; Legislation; Particulates; Motor-vehicles; Control-methods; Exhaust-gases;
Proceedings of a Workshop on the Use of Diesel Equipment in Underground Coal Mines, Morgantown, West Virginia, September 19-23, 1977; Morgantown, West Virginia, NIOSH