Diesel Engines

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    In comments on a rule being reconsidered by the Environmental Protection Agency, power providers and some state air pollution regulators said the rule is too stringent and could cause reliability problems for smaller power systems. The comment period on the reconsideration process closed Feb. 14. EPA’s national emission standards for hazardous air pollutants for stationary compression ignition reciprocating internal combustion engines—diesel engines— were published March 3, 2010, and limited the time diesel engines could be used to meet peak electricity demand to 15 hours per year. Power companies then petitioned EPA to reconsider that limit, saying it was too stringent, preventing engine owners from providing electricity to the power grid during emergency situations. EPA announced Dec. 7, 2010, that it would agree to reconsider the portion of the rule that limited the amount of time diesel engines could be used to meet peak electricity demand. According to power providers that commented on the reconsideration, the engines often are necessary to prevent rolling blackouts. Additionally, regional power grids often require the engines to be available for more than the 15 hours EPA will allow them to provide emergency power. Commenters also were concerned because smaller power providers, particularly municipal and rural systems, do not have the same resources as commercial power companies and rely on the diesel engines as a critical means of providing reliable service during periods of peak electricity demand.
-- You can find the text of the final rule in the Federal Register Archive
-- Read the notice of reconsideration in the Federal Register Archive

Did you know…?
    EPA issued the NESHAP for stationary compression ignition reciprocating internal combustion engines March 3, 2010, at 40 CFR 63, Subpart ZZZZ (75 FR 9648). The rule requires facility operators to reduce emissions of carbon monoxide, used as a surrogate for air toxics, by as much as 70 percent and to take steps to limit emissions of metallic toxics by 2013. EPA estimates that more than 900,000 of the engines are in use at industrial and agricultural facilities. The rule requires engine operators to take measures to minimize engine idling and control air toxic emissions during startup periods. For stationary engines with catalytic controls, the final rule requires operators to limit the time spent at idle and during startup to 30 minutes. The rule defines startup as the time from initial start until load is applied and the engine and associated equipment, including catalyst, reach normal operation.
--Read more…in Air Pollution Control Guide on reciprocating internal combustion engines

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