 Alliance Acoustical Consultants, Inc. |
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INDUSTRIAL NOISE continued - Permitting Support
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Morro Bay Power Plant Client: Duke/Fluor Daniel (EPC Contractor) for Duke Energy North America (DENA) Location: Morro Bay, California, USA Scope: Noise Control Engineering: (a) CEC permit application preparation, submittal, and testimony (b) Preliminary design engineering Regulatory Involvement and Environmental Documentation: Extensive permit application preparation, submittal, review, and testimony before the California Energy Commission (CEC); including public hearings, informal workshops, responses to public and intervenor comments, and sworn proceedings. All CEC hearings, testimony sessions, and public workshops were open to the public, involved public comment/participation, and were televised locally. Project Description: 1,200 MW Combined-Cycle Electric Generation Facility. The project plans to replace the existing gas-fired boiler power generation units (approximately 1000+ MW built in the 1950s) with two 600 MW natural gas-fired, combined-cycle units. Each combined-cycle unit consists of two natural gas-fired combustion turbine generators, two duct-fired heat recovery steam generators, and a reheat condensing steam turbine generator. Dry, low-NOX combustors are used for turbine exhaust emission control. Each combined-cycle unit will use the existing once-through seawater cooling system, but with reduced flow needs and reduced thermal discharges. Noise Control Services: The Morro Bay Project, located along the Central Coast of California is a repowering project to replace aging boiler generators with modern, state-of-the-art gas-fired, combined-cycle technology for power generation. Although the city of Morro Bay has grown and matured for over 50 years around the existing plant and although the modern plant was shown to be a significant improvement over the present plant in nearly every environmental topic, noise was a still major concern with the local citizenry. As a sub-contractor to the turnkey engineering contractor, Duke/Fluor Daniel, AAC staff was involved with the noise control aspects on the proposed combined-cycle electric generation facility throughout preliminary engineering and the permit application process. Specifically, very comprehensive predictive computer modeling was conducted to establish the noise control design basis, equipment emissions limits, plant layout details (for noise mitigation), and noise control features. For example, the two-turbine units were placed back-to-back to leverage the HRSG structures as noise barriers and to protect the nearest sensitive receptors. Furthermore, an acoustic building was planned for each turbine train to both control noise and to enhance the low-profile visual features of the design. Turning the noise control design into a permit application to the California Energy Commission (CEC) involved extensive hearings, public workshops, and testimony. Several iterations of submittals were needed to address community concerns (even though the replacement plant was demonstrated to be significantly quieter than the existing plant), alternative cooling methods, and certification conditions. In all, the Morro Bay application, including the noise issues, was probably the most thoroughly evaluated application ever before the Commission. At present, the application is nearing successful completion with a favorable PMPD issued by the hearing board. |
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