Showing papers on "Diesel generator published in 1999"

Emergence of Recuperated Gas Turbines for Power Generation

Abstract: In the emerging deployment of microturbines (25–75Kw), a recuperator is mandatory to achieve thermal efficiencies of 30 percent and higher, this being important if they are to successfully penentrate the market currently dominated by Diesel generator sets. This will be the first application of gas turbines for electrical power generation, where recuperators will be used in significant quantities. The experience gained with these machines will give users’ confidence that recuperated engines will meet performance and reliability goals. The latter point is particularly important, since recuperated gas turbines have not been widely deployed for power generation, and early variants were a disappointment. Recuperator technology transfer to larger engines will see the introduction of advanced heat exchanged industrial gas turbines for power generation in the 3–15 Mw range.After many decades of development, existing recuperators of both primary surface and plate-fin types, have demonstrated acceptable thermal performance and integrity in the cyclic gas turbine environment, but their capital costs are high.A near-term challenge to recuperator design and manufacturing engineers is to establish lower cost metallic heat exchangers that can be manufactured using high volume production methods. A longer term goal will be the development and utilization of a ceramic recuperator, since this is the key component to realize the full performance potential of very small and medium size gas turbines.Copyright © 1999 by ASME

Marine Molten Carbonate Fuel Cell Demonstration Module. USCGC Vindicator Ship Interface Studies

Abstract: : In this study, the U.S. Coast Guard (USCG) investigated the impact upon CGC VINDICATOR ship systems resulting from potential conversion to fuel cell propulsion and auxiliary power. VINDICATOR is a T-AGOS class monohull, 224-feet in length, powered by four Caterpillar diesel-electric generators with DC propulsion motors. USCG selected this vessel as a candidate for development and potential demonstration of fuel cell power on board ships. Space and weight limitations and marine operational requirements uncovered during this study are believed to be applicable to other ship installations. Detailed changes to structural, electrical, fuel delivery, exhaust management and related systems necessitated by removal of the four main diesel generators and replacement by four molten carbonate fuel cell modules were developed. Also developed was the outline design of each 625 kW molten carbonate fuel cell Demonstration Module, including fuel processing, fuel cell stacks, and inverter. A dynamic computer simulation model was created which linked the fuel cell performance to ship parameters including displacement, speed, and loading cycles. This information was used to analyze the ship integration impacts based on the fuel cell design. Included with this final summary report are outline figures of detailed removal and installation drawings detailing existing and proposed arrangements. Several conclusions are made. The proposed fuel cell modules are compatible with existing ship interfaces, with relatively minor modifications. The fuel cell modules are substantially larger than the diesel generators they replace, necessitating removal of the non-structural side shell within the main diesel generator room. Existing air handling, exhaust, and fuel delivery systems can be reused, ship performance (stability and seakeeping) is unchanged, and minor maneuvering performance changes may result. Increased range is expected due to the predicted higher efficiency of the fuel cells.

Renewable Energy for Sustainable Rural Village Power

Abstract: It is estimated that two billion people live without electricity and its services worldwide. In addition, there is a sizeable number of rural villages that have limited electrical service, with either part-day operation by diesel generator or partial electrification. For many villages connected to the grid, power is often sporadically available and of poor quality. The US National Renewable Energy Laboratory (NREL) in Golden, Colorado, has initiated a program that involves hybrid systems, to address these potential electricity opportunities in rural villages through the application of renewable energy technologies.1 The objective of this program is to develop and implement applications that demonstrate the technical performance, economic competitiveness, operational viability, and environmental benefits of renewable rural electric solutions, compared to the conventional options of line extension and isolated diesel mini-grids. Hybrid systems are multi-disciplinary, multi-technology, multi-application programs composed of six activities, including village applications development, computer model development, systems analysis, pilot project development, technical assistance, and Internet-based village power project data base. While the current program emphasizes wind, photovoltaics (PV), and their hybrids with diesel generator, micro-hydro and micro-biomass technologies may be integrated in the future. Thirteen countries are actively engaged in hybrid systems for rural and remote applications and another dozen countries have requested assistance in exploring wind/PV hybrid systems within their territories. At present rural/remote site application of renewable technologies is the fastest growing aspect of renewable energy worldwide.

Noise lowering structure for emergency diesel generator

Abstract: PROBLEM TO BE SOLVED: To lower the noise with the simple structure, to lower the cost while reducing the sound absorbing material attached variable in an intake duct for emergency diesel generator by providing at least specified number or more of guide valves in a duct. SOLUTION: An emergency diesel generator is formed of a main body 3 loaded with an engine 1 and a power generator 2, an intake duct 4, an exhaust duct 5 and an exhaust cover 6, and the generator 2 generates the power with the drive of the engine 1. A fan is rotated so as to intake the air through the intake duct 4, and after cooling the engine 1, the air is discharged from the exhaust cover 6 through the exhaust duct 5. In this case, the intake duct 4 and the exhaust duct 5 are provided with at least one or more guide valves 7. A diffused sound field is thereby formed in the ducts 4, 5 so as to prevent the generation of internal resonance, and while air flow is smoothened so as to lower the fluid noise. The guide valve 7 is formed into a curved shape, and width of the guide valve 7 is set at a ratio of length of an intake port 41 to that of a discharge port 42.

System-adapted elastic mounting for a diesel generator

Abstract: A mounting is provided for an internal combustion engine coupled to an electric generator which greatly reduces solid-borne noise originating from the internal combustion engine and the generator. A supporting frame 4 contains an acoustically efficient intermediate mass serving to insulate solid-borne noise.