Clean Energy Fuels | Date: 2013-05-24
A dispenser nitrogen purge and heater system for a liquid natural gas (LNG) fueling dispenser, comprising a nitrogen purge enclosure; a nitrogen container containing nitrogen; a nitrogen feed line for feeding nitrogen from the nitrogen container to the nitrogen purge enclosure; a heater for heating an interior space within the enclosure; and a fan assembly for circulating the nitrogen within the interior space
Clean Energy Fuels | Date: 2014-10-08
The present invention provides a regenerative thermal oxidizer system, comprising: a recuperative heat exchanger that receives process exhaust gas from an anaerobic digestion process and boosts an inlet temperature of the gas to a second gas temperature; and a regenerative thermal oxidizer that receives the gas from the heat exchanger, further heats/combusts the gas to a third gas temperature, and feeds the gas back through the recuperative heat exchanger, which recoups heat from the gas such that the gas exits the heat exchanger at a fourth gas temperature.
Clean Energy Fuels | Date: 2014-01-08
The present invention provides non-venting transfer systems and methods related to transferring cryogenic liquid between two vessels without venting evaporated cryogenic liquid into the atmosphere. The stations, systems, and methods utilize a feed line and a return line connecting a source tank and a pump system to allow for flow of a cryogenic liquid to the pump and return of evaporated cryogenic liquid to the source tank, thereby avoiding release of the evaporated cryogenic liquid into the atmosphere.
Clean Energy Fuels | Date: 2014-02-26
Methods and systems and are presented for estimating the amount of natural gas provided to a vehicle at a natural gas time-fill filling station. The methods comprise measuring and wirelessly transmitting pre- and post-fill pressures measurements of compressed natural gas in a compressed natural gas storage tank on-board a natural gas vehicle.
Clean Energy Fuels | Date: 2013-08-16
The present invention provides a method and apparatus for the treatment of process gas from an anaerobic digestion system or a landfill gas system. In one embodiment, the system comprises a caustic scrubber including a vertical column having a top and a bottom and including a counter current flow system, wherein a process gas stream flows up vertically through the column in counter current flow to a caustic liquid solution that flows downward through the column. The caustic liquid solution removes at least one acid from the process gas stream, wherein treated gas that is substantially free of acids bubbles out through an opening at the top of the vertical column