Technology Update: Novel ignition unit cuts ... - ACS Publications

In Risk versus Risk, John Graham, Jonathan Wiener and their colleagues at the. Harvard Center for Risk Analysis marshal an impressive set of case stud...
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On the basis of test results, Augusta Fiberglass determined the biofilter technology to be its least-cost emissions control option. Comparative technology studies indicate that biofiltration is 2-10 times less expensive than thermal oxidation or catalytic oxidation, 10-40 times less expensive than carbon adsorption, and 4 times less expensive than traditional scrubbing technologies. K.S.B.

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Novel ignition unit cuts emissions SmartPlug, an alternative combustion engine ignition device that reduces pollution by promoting more complete fuel consumption, is inching closer to the marketplace. This spring, HydraLytic Technologies, a Sandpoint, Idaho, research and development firm, evaluated its novel sparkplug replacement unit in tests performed with a small-engine manufacturer. Results show that, compared with conventional sparkplug performance, SmartPlug produces 20% more power per unit of fuel combusted, 97% less NOx, 94% less CO, 60% fewer hydrocarbon emissions, and 50% greater thermal efficiency. Tests in automobile-sized engines produced similar results. However, when the novel units are used in gasoline and other traditional fuelfired engines, a leaner air-fuel mixture must be maintained to realize emissions reductions of 40-60%. Conversion from sparkplug to SmartPlug is straightforward. However, whereas a typical sparkplug generates roughly a 0.125-joule discharge, SmartPlugs produce a 25joule burst of energy, nearly instantaneously igniting 2-5% of an engine combustion chamber mixture. The key to SmartPlug's performance is a catalyst-coated ceramic rod located in its interior cavity. The heated catalyst, composed of platinum, rhodium, palladium, cerium, or a combination of these metals, causes air-fuel mixtures to decompose partially into reactive intermediates during a brief preignition period. Mark Cherry, an inventor who teamed up with HydraLytic a year ago, said the SmartPlug design also features an "exhaust gas spring" that self-adjusts to engine conditions and promotes more complete combustion venting any unreacted air-fuel mixture from reaching the ignition chamber prematurely K.S.B