 Alliance Acoustical Consultants, Inc. |
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INDUSTRIAL NOISE continued - Retrofit
and Treatment
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Liberty Electric Project Client: Duke/Fluor Daniel (EPC Contractor) for Liberty Electric Power, LLC, (an affiliate of Reliant Resources, Inc.). Location: Eddystone, Pennsylvania, USA Project Description: 550 MW Combined-Cycle Electric Generation Facility. Major equipment includes two General Electric model PG-7241 FA combustion turbine generators, two Aalborg heat recovery steam generators (HRSGs) with integral duct firing, and one Toshiba condensing steam turbine generator. Dry low-NOx combustors and a selective catalytic reduction system are used in this facility for turbine exhaust emission control. The facility uses evaporative coolers for inlet air cooling and power augmentation. The project was completed in March of 2002. Scope: Noise Control Engineering: (a) Permitting assistance, (b) Design engineering, (c) Procurement support, (d) Compliance verification survey, and (e) Post-commissioning noise reduction troubleshooting. Regulatory Involvement and Environmental Documentation: Provided initial plant noise emissions predictions, associated community impact assessment, and engineering design basis noise study to project for use in discussions with local authorities. Noise Control Services: The Liberty Project, located in Eddystone, Pennsylvania (just outside of Philadelphia), is a brownfield project located at the previous Baldwin Locomotive Facility. Noise requirements were complicated by the combination of several local jurisdictions, as well as varying adjacent land uses, including industrial, commercial, and residential zones. As a sub-contractor to the turnkey engineering contractor, Duke/Fluor Daniel, AAC staff was involved with the noise control aspects on this 550 MW combined-cycle electric generation facility from the proposal phase through detailed design and into post-commissioning retrofitting. The noise control engineering design basis was established via predictive computer modeling before any equipment items were ordered or plant layouts were finalized. Noise control limits were assigned to all major noise sources and the main turbine building’s acoustical features were integrated into the overall plant design to ensure meeting the project requirements. Following start-up, AAC engineers made scores of measurements within the plant, at the facility boundary, and at adjacent community receptor locations to verify and document noise compliance during partial- and full-load operations. Later, after some concerns from the owner and local citizens about start-up noise during merchant plant operations, AAC again mobilized considerable resources and instrumentation to the site and conducted extensive on-site troubleshooting of steam vents, by-pass valves, steam lines, and drum resonances. Troubleshooting measurements involved taking noise level data at a dozen sampling locations simultaneously to assess the temporal changes in noise emissions throughout the start-up process and to pin-point the worst offenders. Noise control methodologies were recommended and implemented by the plant to reduce start-up noise emissions to acceptable levels. |
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