Method for production of a compressed natural gas equivalent from landfill gas and other biogases

摘要

Biogas is converted to a vehicle fuel equivalent to compressed natural gas high in methane in a simple, low cost process involving steps of refrigeration, non-regenerative activated carbon purification and carbon dioxide removal using low-pressure membrane technology.

主权项

1. A method for converting landfill gas and other biogases into a compressed biomethane for use as fuel, said method comprising steps of:
drawing biogas from a biogas source, then pressurizing the biogas, then chilling the biogas to 40° F. to 70° F., then separating condensed water from the biogas, then compressing the biogas to about 120 psig, then cooling the biogas, then dehumidifying the biogas, then removing volatile organic compounds from the biogas by passing it through a non-regenerative activated carbon bed, then passing the biogas through a gas separator having a membrane which preferentially removes gases other than methane from the biogas, thus producing a gas having a methane content higher than that of the biogas, and then compressing and storing the gas.