Emissions and control technology associated with using diesel engines in underground coal mines was discussed. This was a summary of the discussion of the Emission and Control Technology Work Group presented at a NIOSH sponsored workshop on using diesel engines in underground coal mines. The work group attempted to estimate emission factors, concentrations of carbon-monoxide (630080), hydrocarbons, nitric-oxide (10102439), nitrogen-dioxide (10102440), particulates, phenols, aldehydes, sulfur-dioxide (7446095), sulfuric- acid (7664939), trace metals, polynuclear aromatic hydrocarbons (PNAs), benzene (71432), odor, and irritancy, for exhausts from untreated and treated diesel engines. The existing data base was found to be inadequate for determining emission factors on which to base estimates of underground exposure. The effects of duty cycles, vehicle type, acceleration and deceleration, and engine type on exhaust emissions were considered. State of the art techniques for characterizing diesel exhaust emissions were summarized. The effects of maintenance, fuel and fuel additives, and emission control devices such as water scrubbers and oxidation catalysts on diesel exhaust emissions were discussed. Parameters that affect the operational and exhaust characteristics of diesel engines operating in underground mines were listed. Techniques that could potentially reduce diesel engine emissions were discussed. These include improvements related to the engine intake system such as water emulsion, cooled or uncooled exhaust gas recirculation, or methanol aspiration, in cylinder control of the combustion process, and post cylinder exhaust emission control. The work group concluded that an adequate data base for estimating underground exposures to diesel pollutants does not exist. Further studies are needed to characterize the influence of engine type on those emissions which are thought to have the most adverse health effects, especially nitrogen-dioxide, particulates, and PNAs. Control techniques that can substantially reduce the pollutants in diesel exhausts are available.
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