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Microturbine Exhaust PG Supply To Space Heating Coil CHP System Exhaust SRI/USEPA-GHG-VR-27 September 2003 Capstone 60 Microturbine Copeland-Scroll Gas Compressor (to 90 psig) Unifin Heat Exchanger 75 psig Regulator PG Return Natural Gas Input (nominal 5 psig) To Desiccant Regeneration Coil Main 480 Volt Panel Figure 1-2. Capstone Microturbine System Process Diagram The permanent magnet generator produces high-frequency alternating current which is rectified, inverted, and filtered by the line power unit into conditioned 480 volts alternating current (VAC). The unit supplies an electrical frequency of 60 hertz (Hz) and is supplied with a control system which allows for automatic and unattended operation. An active filter in the generator is reported by the turbine manufacturer to provide cleaner power, free of spikes and unwanted harmonics. All operations including startup, setting of programmable interlocks, grid synchronization, operational setting, dispatch, and shutdown, can be performed manually or remotely using the internal power-controller system. The gas booster compressor is a Copeland-Scroll Model SZN22C1A with a nominal volume capacity of 29 standard cubic feet per minute (scfm) and the capability of compressing natural gas from inlet pressures ranging from 0.25 to 15 pounds per square inch gauge (psig) to outlet pressures of 60 to 100 psig. The compressor is boosting gas pressure from approximately 5 to 90 psig in this application. A regulator is located downstream of the compressor to control and maintain gas pressure to the microturbine at 75 psig. The compressor imposes a parasitic load of approximately 3.9 kW on the overall CHP system generating capacity. Figure 1-2 shows that waste heat from the microturbine exhaust, at approximately 580 °F, is recovered using a heat recovery and control system developed by Unifin International and integrated by Capstone. It is an aluminum fin-and-tube heat exchanger (Model MG2) suitable for up to 700 °F exhaust gas. A nominal 25-percent mixture of PG in water (designated as "PG fluid" for the remainder of this document) is used as the heat-transfer media to recover energy from the microturbine exhaust gas stream. The PG fluid is circulated at a rate of up to 50 gallons per minute (gpm). A digital controller monitors the PG fluid outlet temperature, and when the temperature exceeds user set point, a damper automatically opens and allows the hot exhaust gas to bypass the heat exchanger and release the heat through the stack. The damper allows hot gas to circulate through the heat exchanger when heat recovery is required (i.e., the PG fluid outlet temperature is less than user setpoint). This design allows the system to protect the heat recovery components from the full heat of the turbine exhaust while still maintaining full electrical generation from the microturbine. 1-4PDF Image | Environmental Technology Verification Report
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