 Alliance Acoustical Consultants, Inc. |
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INDUSTRIAL NOISE continued -
Design Engineering & Verification
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Newington Energy Facility Client: Duke/Fluor Daniel (EPC Contractor) for ConEd Development Location: Newington, New Hampshire, USA Project Description: 525 MW Combined-Cycle Electric Generation Facility. Major equipment includes two General Electric (GE) model PG7241 FA combustion turbine generators, two Foster Wheeler heat recovery steam generators (HRSGs) with integral duct firing, and one GE D11 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. Overall plant cooling is provided by a 10-cell wet cooling tower from Marley Cooling. The project was completed in fall 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 the project for its use in discussions with local and state authorities. Noise Control Services: The Newington Project, located in Newington, New Hampshire (just west of Portsmouth), is a combined-cycle electric generation facility located in a mostly commercial/industrial near the Piscataqua River. Due to a smattering of residential properties in all directions, most within 1,400 feet of the plant (the closest being around 850 feet away), noise was a concern from the outset of the project’s development. Noise requirements were detailed, complicated, and restrictive – given the nearby residential land uses – involving absolute noise level limits, restrictions on incremental increases above the pre-plant ambient, tonal limits, and a criterion for community responses to industrial noise. AAC staff members were involved with the noise control aspects on this project over several years; from the proposal phase through detailed design and into compliance verification and post-commissioning troubleshooting. Predictive computer modeling helped establish the noise control engineering design basis, as well as the noise control emissions limits for all major noise sources. This modeling investigation was key to defining the main turbine building’s acoustical features as well as special-design characteristics for many potentially noisy mechanical and electrical equipment items. During and after start-up, AAC engineers measured noise levels within the plant and at adjacent community receptor locations to document noise emissions from specific equipment, as well as the overall plant. Items that were not performing, acoustically, according to the purchase agreement were identified and vendor modifications were initiated. Later, AAC engineers made detailed verification measurements, in parallel with noise consultants representing the city, to confirm facility compliance and/or identify additional noise problems. Spectral data pointed to particular motor-drive systems as still not meeting the design specification and, therefore, needing mitigation treatments. AAC worked with the contractor’s staff and the equipment vendor to enclose the motors for acceptable noise performance and plant compliance. |
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