Yankee Gas operates an “LNG Peak Shaving Facility” in Waterbury, CT. The facility takes gas from the supply grid and cools it to a liquid during warm months when natural gas demand is low. The liquified natural gas (LNG) is stored in tanks for use during high gas demand periods (cool months).
Incoming gas goes through a gas dryer to remove moisture before going through chillers to be liquified. The drier is a media bed. This process also removes mercaptans and sulfer. The beds are periodically regenerated producing a “tail gas” which contains high concentrations of mercaptans. The tail gas is sent back to the supply grid but has been generating customer complaints about odors. Carbtrol's system is used to remove the high mercaptan concentrations from the gas before introducing it to the supply grid.
Carbtrol manufactured a skid mounted system for Yankee Gas which consists of the following: