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US 8,999,036 B2Granted
Method for production of a compressed natural gas equivalent from landfill gas and other biogases
AssigneeStearns, Conrad and Schmidt, Consulting Engineers, Inc.
InventorJeffrey L. Pierce
Life of this patent
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Abstract
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.
Claims5
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.
7 more elements
Dependencies are inferred from the claim text.