Operation of natural gas engines for highest efficiency and lowest emissions requires precise air-fuel-ratio control during both steady state and transient conditions with optimized air fuel mixing and powerful ignition of the resulting charge. To achieve this goal, our electronic control systems employ as many as three separate air flow models used for different parts of the engine’s operating map. Fuel flow is just as critical, and we have developed proprietary fuel flow modeling specifically for natural gas and propane applications. Variability of fuel composition can be a concern and is easily addressed with our systems.
For lowest possible emissions, we recommend stoichiometric fuel systems employing three way catalyst technology. These systems can meet any required standard, USA or EURO. We work with a variety of catalyst manufacturers to meet the specific goals of our customers. For highest efficiency and good emissions, we recommend lean-burn technology possibly including EGR. Both stoichiometric and lean-burn systems are currently available from North American Repower.
Which System is Best for You?
We offer different systems, each with its own benefits and costs. The subtleties of the various systems can not be put in a graphic, and there are so many different types of diesel engines operating at various performance levels that determining the best system for a given engine application cannot come from a chart. For more information on determining what system approach best suits your application, please feel free to contact our technical support staff.