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Gas Turbine Handbook : Principles and Practices

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Case History #4 275<br />

Figure 17-4. <strong>Gas</strong> Compression System<br />

<strong>Gas</strong> Piping to the Microturbines Located at the School<br />

High-density polyethylene (HDPE SDR 9) pipe 4 inches in<br />

diameter <strong>and</strong> 1/2 mile long was installed 4 to 12 feet below ground,<br />

running from the HOD L<strong>and</strong>fill to the microturbines at the school.<br />

The use of horizontal drilling techniques allowed the pipe to cross<br />

beneath a stream, a road, public utilities, athletic fields, <strong>and</strong> a railroad,<br />

with minimal disturbance of the ground surface. This was extremely<br />

important for the community <strong>and</strong> the school’s athletic programs.<br />

Electric Generation<br />

Twelve Capstone Micro<strong>Turbine</strong>s are located at the school<br />

to provide the electricity <strong>and</strong> heat from the LFG. Each Capstone<br />

Micro<strong>Turbine</strong>TM fueled by the l<strong>and</strong>fill gas produces up to 30 kW of<br />

three-phase electricity at 480 volts, using 12 to 16 cubic feet per minute<br />

(cfm) of l<strong>and</strong>fill gas for a total of 360 kW of electricity—enough to power<br />

the equivalent of approximately 120 homes. The microturbine system<br />

incorporates a combustor, a turbine, <strong>and</strong> a generator. The rotating<br />

components are mounted on a single shaft supported by air bearings

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