Gas Turbine Handbook : Principles and Practices

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144 Gas Turbine Handbook: Principles and Practices 8. “Carbon Monoxide: Natural Sources Dwarf Man’s Output,” T.N. Maugh II (1972). 9. “Physical Climatology,” W.D. Sellers (1965). 10. “Examine Full Impact Of Injecting Steam Into Gas-Turbine Systems” Elizabeth A. Bretz, Power Magazine, June 1989. 11. “Design And Operating Experience of Selective Catalytic Reduction Systems for NO x Control In Gas Turbine Systems,” S.M. Cho and A.H. Seltzer, Foster Wheeler Energy Corp., and Z. Tsutsui, Ishikawajima- Harima Heavy Ind. 12. “Design Experience of Selective Catalytic Reduction Systems For Denitrification of Flue Gas,” S.M. Cho, Foster Wheeler Energy Corp.
Gas Turbine Acoustics and Noise Control 145 Chapter 10 Combustion Turbine Acoustics and Noise Control COMBUSTION TURBINES— LOTS OF POWER IN A LITTLE SPACE Avery attractive attribute about combustion turbines is the modular packaging of these units for fairly rapid delivery and installation. Some OEMs or other packagers package the units to produce no more than a certain sound level at 400 feet (or at some standard distance) from the site, but multiple units co-located and combined with other sources of noise can cause some difficulty in determining the total sound level at a location. The complexity of combustion turbine systems and their ancillary equipment generally requires an acoustical engineer well experienced with such systems to fully analyze the acoustical emissions and make a determination whether the expected sound levels meet regulatory requirements, are in balance with the environment or community, or need some level of noise mitigation. Industrial combustion turbines are built as compact high power delivery systems and the only place available to reduce the noise is by adding on duct-silencing equipment to the front and rear of the turbine system, which requires real estate and hardware that increase cost. Technological advances over the last two decades have given designers more tools and materials to develop some significant noise control breakthroughs but these engines still produce significant noise levels that must be mitigated or reduced to make these engines compatible with either environmental or occupational regulatory noise requirements. Combustion turbines typically have inlet (compressor end) and exhaust (turbine end) total sound power levels ranging from 120 decibels (dB) to over 155 dB. A reduction of 20-30 dB is fairly easy, 30-50 is typical of most silencer installations, 145
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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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Figure 2-3. Courtesy of United Tech
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Appendix A-2 304 Gas Turbine Handbo
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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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