Landfill Gas Processing Plant
The landfill gas design consists of an extraction header outlet that connected to a gas compressor in the processing plant, and this draws the gas from the underground system of pipes compressing it before being passed through a refrigerant plant where the gas is dried.
From here the gas is cleaned in a scrubber where the non-methane components are removed, i.e. CO2, nitrogen, oxygen, hydrogen along with any unwanted trace gasses, and it then passes into a storage tank ready for use.
In some plants, a portion of the landfill gas is used to run a reciprocating engine similar to a diesel engine, powering an electric generator that producse electricity for the site plant use. The remainder of the gas is supplied to a gas turbine driving an electric generator which produces electricity for sale to the national grid.
If a gas turbine generator is used, the exhaust gasses exiting from the turbine can be used to raise steam in a waste heat boiler. Depending on the quantity of steam raised, the steam can either be used as process steam within in the plant, or to power a steam turbine again driving a generator producing electricity for the plant or grid.
Note: When the exhaust from a gas turbine electric generator is used to generate steam in a waste heat boiler and this steam is used to drive a steam turbine, it is known as a Combined Cycle Power Plant.
- EPA Landfill Gas
- EPA Landfill Gas Plants
- Landfill Gas Expert