Gas Turbine Handbook : Principles and Practices

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276 Gas Turbine Handbook: Principles and Practices that rotate at up to 96,000 RPM. The generator is cooled by airflow into the gas turbine. Built-in relay protection (over/under voltage and over/under frequency) automatically trips off the microturbines in the event of a utility system outage or a power quality disturbance. Excess electricity not used by ACHS is sold to Commonwealth Edison. A 12-turbine system was selected to provide a system that will remain functional as LFG production from HOD Landfill decreases. Based on the initial LFG collection rates, up to 18 turbines could have been installed. The final payback for this project, based on conservative assumptions for future energy costs, is approximately 8 years. The installed microturbines are shown on Figure 17-5. Heat Generation Each Capstone MicroTurbineTM produces exhaust energy of around 290,000 Btu/hr at 550°F. The exhaust from the microturbines is routed through heat exchangers that heat the liquid, which then circulates through underground insulated steel pipes running beneath a parking lot to the school’s boiler system. Because heat is being transferred to the school through insulated 4-inch–diameter pipes, locating the turbines next to the school was critical in preventing excess heat loss. When waste heat recovery is not required by ACHS, the microturbine exhaust is automatically diverted around the exchanger, allowing continued electrical output. During extremely cold weather, the school boiler system automatically uses natural gas to supplement the heat output of the microturbines. SUMMARY This project serves as a model of how a landfill with relatively small quantities of LFG can be used to produce clean efficient energy. By using the electricity and heat created during power production, microturbines become more practical for landfill gas utilization. The main advantages of microturbine technology over other more traditional internal combustion engines are the clean, quiet operation and the ability to add and remove microturbines as gas flow increases or decreases. The project’s design and construction can be a model for other communities that are interested in the beneficial reuse of nearby
Case History #4 277 Figure 17-5. Installed Microturbines. landfill gas resources. It is an example of how to deal with the numerous community concerns related to developing an alternative energy system based on landfill gas. Determining suitable equipment for system design, construction, and operation, while considering local community needs and requirements, is critical to a successful project. This project is a prime example of how innovative partnerships and programs can take a liability and turn it into a benefit. The solution has
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Gas Turbine Handbook: Principles an
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Dedication This book is dedicated t
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Contents PREFACE ..................
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Chapter 13—BOROSCOPE INSPECTION .
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Preface to the Third Edition The ne
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Acknowledgments I wish to thank the
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2 Gas Turbine Handbook: Principles
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Figure 2-3. Courtesy of United Tech
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Chart 8-1 Gas Turbine Environments
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5. Weather Hood Material __________
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Appendix C-6 Air/Oil Cooler Specifi
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9. Drive Requirements A. Hydraulic
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22. Packaging For Shipment Per Spec
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Parameters Units NH 3 CO H 2 CH 4 C
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.055 Parameters Units 1/0 .88/.12 .
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Koppers Foster Blue Coal Gas Winkle
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