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Technology

pSCR for H2 MCCI via dedicated rich cylinder operation

Invention Reference Number

202405780
Aviation jet engine. image from Envato

This invention presents a hydrogen-fueled combustion engine designed to significantly reduce carbon dioxide and nitrogen oxide (NOx) emissions while maintaining high efficiency and performance characteristics similar to conventional diesel engines. The engine utilizes a novel combustion strategy and a non-urea aftertreatment system to achieve near-zero tailpipe NOx emissions and eliminate CO2 emissions.

Description

The proposed concept uses an actively fueled prechamber and high-pressure direct injector system to achieve mixing-controlled combustion (MCC) with hydrogen. The prechamber jet flames act as an ignition source for the direct injected hydrogen, allowing for a rapid and controlled combustion process similar to that of diesel engines. The engine also integrates a non-urea SCR aftertreatment system, where a dedicated engine cylinder produces ammonia on-board for use as a NOx reductant. This innovative hydrogen combustion engine offers a sustainable alternative to diesel-powered engines, contributing to cleaner, more efficient commercial and industrial transportation.

Benefits

  • Zero CO2 Emissions: The engine is fueled entirely by hydrogen, leading to no CO2 emissions during operation.
  • Near-Zero NOx Emissions: The innovative aftertreatment system controls NOx emissions without the need for urea, reducing environmental impact.
  • Comparable Diesel Engine Performance: The engine maintains the performance characteristics of traditional diesel engines, including high efficiency, power density, and torque response.
  • Cost Reduction: By eliminating the need for urea, the technology reduces both initial and operating costs, making it more cost-effective than traditional diesel engines.

Applications and Industries

  • Commercial Vehicles: Including heavy-duty on-road trucks, locomotives, and off-road equipment 
  • Marine Vessels: Potential applications for hydrogen-powered marine engines, supporting emission reduction in maritime transportation
  • Mining, construction, and agriculture

Contact

To learn more about this technology, email partnerships@ornl.gov or call 865-574-1051