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INDUSTRIAL NOISE continued - Retrofit
and Treatment
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Brasil D-1 Power Plant Design Client: Duke/Fluor Daniel (EPC Contractor) for Duke Energy International Location: Pederneiras, São Paulo, Brazil Project Description: 500 MW Combined-Cycle Electric Generation Facility; with a phased installation of simple-cycle operations, followed some time later with full, combined-cycle functionality. Proposed major equipment included two General Electric (GE) model PG7241 FA combustion turbine generators, two 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 would be used for turbine exhaust emission control. The facility was planned for overall plant cooling via an 8-cell wet cooling tower. Scope: Noise Control Engineering: (a) Permitting assistance and (b) Design engineering. Regulatory Involvement and Environmental Documentation: Provided initial plant noise emissions predictions, associated community impact assessments, and an engineering design basis noise study for the project’s use in discussions with local and state authorities. Noise Control Services: The Brasil D-1 Project, located in the state of São Paulo, Brazil was planned to be the first combined-cycle electric generation facility in Brazil. It was to be located in a remote agricultural area. Due to a handful of farm houses in the vicinity of the project site, plus very conservative Brazilian noise regulations that, strictly speaking, pertained to this mixed-use scenario, noise concerns surfaced early in the project’s development. Predictive computer modeling helped establish the baseline noise control engineering case, the nominal noise control emissions limits for all major noise sources, and the foundation for several noise control cases (for increasingly quieter operations). This noise modeling investigation was key to defining the facility’s overall noise emissions, potential impacts to the closest farmhouses, and special-design acoustical features that could be weighed against alternative mitigation methods (such as rezoning, land acquisition, and/or variance applications). During the course of the modeling evaluations, pressure from the local energy establishment and regulatory authorities prompted a need for additional accuracy of the predictions. The client suggested a novel solution of measuring a very similar plant, the Duke Energy Hinds Power Project in Jackson, Mississippi, to leverage the measurable noise emissions of an as-built project to the proposed facility in Brazil. AAC engineers measured noise levels within the Hinds plant and at off-site receptor locations to document noise emissions from the overall plant and how they became attenuated over increasing distances from the sources. Later, AAC engineers made detailed propagation analyses to correlate the field measurement data with established propagation algorithms and to identify transmission characteristics that could be applied to the Brasil D-1 situation. These characteristics were used to refine the computer modeling results such that enhanced accuracy in the future-conditions modeling could be obtained via the real-world adjustments. These improved-accuracy noise modeling and analysis results, proposed mitigation options plus their associated costs, and discussions of administrative/procedural alternatives were presented to the client in a comprehensive noise evaluation report. |
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