Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 86 for “"combined-cycle"”.
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Toward automated design of Combined Cycle Propulsion
… of such vehicles is the further development of Combined Cycle Propulsion technology. In this thesis, a new engineering tool called the HYbrid PRopulsion Optimizer (HyPro) is presented, with the aim of analysing the performance of diverse engine concepts. The tool is conceived to be modular and …
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SIMULATION AND OPTIMIZATION OF COMBINED CYCLE GAS TURBINE POWER PLANTS
Combined cycle gas turbine (CCGT) power plants normally run under off-design (namely part-load) conditions during their lifetime. Off-design operation decreases plant thermal efficiency and increases carbon emissions. Hence, there are strong incentives to study and improve CCGT performance under …
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Modeling and Optimization of Turbine-Based Combined-Cycle Engine Performance
… air turborocket and hydrogen-fueled expander-cycle air turborocket are also competitive because they may provide greater thrust-to-weight than the TBE, but require some engineering problems to be addressed before being fully developed.
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The Off-Design Modelling of a Combined-Cycle Power Plant
… which are more attainable through the use of combined-cycle power plants. These aspects are required to account for the fluctuation of the supply as well as the demand of power that is associated with renewable energy. Combined-cycle power plants consist of a gas turbine as the topping cycle, …
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A combined cycle approach to dual-mode scramjet design and analysis
… in a successful demonstration of a rocket-based combined cycle (RBCC) combustion mode transition. In the final portion of the current work, original analyses of the thermodynamics and gasdynamics that govern the theoretical performance of dual-mode scramjets are conducted. The accompanying …
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New modelling and control methods with application to combined cycle power plants
… to build a software simulation of combine cycle power plants. A new MIMO PID controller tuning method and a novel predictive PID controller design method for MIMO systems are also described in the thesis. The emphasis of this work is on simulation; identification and controller design …
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Study of the combined cycle power plant as a generation expansion alternative
… is needed as a part of evaluating the impact of combined cycle and phased-construction of integrated coal gasifier power plants on generation expansion. The study encompassed both large and small electric utilities and long-run, least-cost expansion plan for the generating system and studies of …
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Tools for Analysis of Complex Geometries for a Combined Cycle SCRAM Jet / Rocket
<p>A preliminary design for a variable geometry combined cycle supersonic combustion ram jet (SCRAM jet) / rocket was developed. A precise geometry was selected by parametric analysis and the resultant geometry was analyzed using a computational fluid dynamics (CFD) code developed by Dr. Eric …
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Simulation and optimization of hot syngas separation processes in integrated gasification combined cycle
IGCC with CO2 capture offers an exciting approach for cleanly using abundant coal reserves of the world to generate electricity. The present state-of-the-art synthesis gas (syngas) cleanup technologies in IGCC involve cooling the syngas from gasifier to room temperature or lower for removing …
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Potentially available natural gas combined cycle capacity : opportunities for substantial CO₂ emissions reductions
Thesis (S.M. in Engineering and Management)--Massachusetts Institute of Technology, Engineering Systems Division, 2010.
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Economics of coal gasification-combined cycle and coal-fired plants for electric power generation
Includes bibliographical references (pages 92-98).
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Study on underground coal gasification combined cycle coupled with on-site carbon capture and storage
… by analogue to an integrated gasification combined cycle (IGCC) plant with CO2 capture. The results indicate that, as there is no surface gasifier and fuel handling system, the capital cost of a UCG-CCS system is significantly reduced by 50%, and the UCG-CCS system presents advantages over …
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Analysis of Biomass/Coal Co-Gasification for Integrated Gasification Combined Cycle (IGCC) Systems with Carbon Capture
<p>In recent years, Integrated Gasification Combined Cycle Technology (IGCC) has become more common in clean coal power operations with carbon capture and sequestration (CCS). Great efforts have been spent on investigating ways to improve the efficiency, reduce costs, and further reduce greenhouse …
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Carbon Capture Efficiency in Natural Gas Combined Cycle Power Plants: Analyzing the Effects of Variable Load Operations
… grid optimization tool, to evaluate natural gas combined cycle power plants equipped with carbon capture technology. The modified optimization models are run using the ISO New England grid system, and results suggest that incorporating advanced start-up penalties for natural gas plants reduces …
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Performance and emission characteristics of natural gas combined cycle power generation system with steam injection and oxyfuel combustion.
Natural gas combined cycle power generation systems are gaining popularity due to their high power generation efficiency and reduced emission. In the present work, combined cycle power generation configuration systems studied with natural gas as primary fuel oxidizes with air and pure oxygen …
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The Impact of Environmental Policies and Innovation on the Investment in and Use of Natural Gas-Fired Combined Cycle Generators in the US Electricity Sector
… prices, developments with the natural gas-fired combined cycle generator (NGCC) have contributed to the rise of natural gas. In the 1990s, technological innovations led to substantial efficiency gains for NGCC, rendering these generators cleaner and more efficient than other widely available …
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The Influence of Mixing Duct Length and Phase of Flight on Wall Temperatures of a Rocket Based Combined Cycle Engine in Ejector and Air-Augmented Modes
<p>Rocket Based Combined Cycle (RBCC) engines have been theorized as a possible means of powering launch vehicles and high-speed atmospheric vehicles. By incorporating aspects of both air-breathing and rocket propulsion, RBCC engines promise up to a 230 % increase in specific impulse over …
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Conceptual development and analysis of multiple integrated hydrogen production plants with Cu-Cl cycle
… and thermochemical water decomposition cycle, based on the chemical couple Cu-Cl. The first system consists of coal gasifier, membrane shift reactor, hydrogen fueled combined cycle, cryogenic air separation unit, compression system and five-step Cu-Cl cycle. The second system consists of …
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Optimal GENCO bidding strategy
… to lower production costs, for example: Combined Cycle units. Economic dispatch with Combined Cycle units becomes a non-convex optimization problem, which is difficult if not impossible to solve by conventional methods. Several techniques are proposed here: Mixed Integer Linear …
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Analysis of hydrogen-based energy storage pathways
… or pipeline) and utilization (PEMFC, SOFC or combined cycle gas turbine). All processes are simulated with respect to their full and part-load efficiencies and resulting costs. Furthermore, load profiles are estimated to simulate a whole year of operation at varying loads. The results show …
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