Abstract
Increasing numbers of fleet operators are being mandated by legislation to use fuels that reduce emissions and dependence on foreign oils. Many organic waste-producing industries are experiencing expensive waste disposal by conventional land-fill methods. Attractive economics continues to be the strongest sustainable motivation for conversion to alternative fuels such as liquefied natural gas (LNG) and compressed natural gas (CNG).
Compact gas purification units with efficient small-scale liquefiers offer significant benefits to fuel station operators. This process produces lower cost CNG and LNG than gasoline or diesel fuels.
The unique features include a local purifier and liquefier which are inexpensive,;;:to manufacture because they are based on efficient regenerative purifiers, mass-produced compressors and heat exchanger components from the conventional refrigeration industry rather than custom units. The system is safe, convenient, reliable, and can operate continuously. It is easy to maintain, can be flexibly sized to give high capital utilization, and easily scaled to allow incremental fleet conversion or matching to the biogas stream from an available variety of waste stream anaerobic digesters.
We are constructing both LNG and CNG fueling stations with the fuel processing equipment buried in a concrete vault to improve safety and to reduce the area required at the fueling station site for the fuel production equipment.