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Case History #4 275
Figure 17-4. Gas Compression System
Gas Piping to the Microturbines Located at the School
High-density polyethylene (HDPE SDR 9) pipe 4 inches in
diameter and 1/2 mile long was installed 4 to 12 feet below ground,
running from the HOD Landfill to the microturbines at the school.
The use of horizontal drilling techniques allowed the pipe to cross
beneath a stream, a road, public utilities, athletic fields, and a railroad,
with minimal disturbance of the ground surface. This was extremely
important for the community and the school’s athletic programs.
Electric Generation
Twelve Capstone MicroTurbines are located at the school
to provide the electricity and heat from the LFG. Each Capstone
MicroTurbineTM fueled by the landfill gas produces up to 30 kW of
three-phase electricity at 480 volts, using 12 to 16 cubic feet per minute
(cfm) of landfill gas for a total of 360 kW of electricity—enough to power
the equivalent of approximately 120 homes. The microturbine system
incorporates a combustor, a turbine, and a generator. The rotating
components are mounted on a single shaft supported by air bearings