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Modular construction. --- Combined cycle power plants.

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The aim of this thesis is to improve the circulation model of horizontal heat recovery steam generator evaporator with natural circulation used at John Cockerill. In this type of boiler, it is essential to have an accurate circulation model. Indeed, in natural circulation, the flow in the evaporator is only ensured by the boiler design because no pump allows the flow circulation. 


In this report, a detailed description of the recovery boilers and the circulation model currently in use is presented with a focus on the pressure drop calculation. Different ways to improve the model are explored.

Firstly, the impact of radiation on pressure drop in evaporator tube is studied. It is concluded that it can increase or decrease the pressure drop depending on some conditions.

Then, a study of the flow pattern of two-phase flow in vertical tubes is done because the present John Cockerill's model takes only in charge the horizontal tubes.

Moreover, different pressure loss correlation models for two-phase flow in tubes are described and compared. The target is to choose one of them that could replace the correlation currently used at John Cockerill. 

Finally, several pressure drop correlations in tees and bends are introduced and compared. It highlights some gaps between models for two-phase flow in bends. In tees, a more accurate pressure drop correlation than the one currently used is also analyzed.

boiler --- evaporator --- combined-cycle --- Pressure drop --- Ingénierie, informatique & technologie > Energie

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Coal gasification. --- Combined cycle power plants. --- Charbon --- Centrales à cycle combiné. --- Gazéification.

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Integrated gasification combined cycle power plants. --- Coal gasification. --- Gases --- Purification. --- Gas purification --- Purification of gases --- Coal --- Gasification of coal --- Carbonization --- Distillation, Destructive --- Gas manufacture and works --- Gas producers --- IGCC power plants --- Integrated coal gasification combined cycle power plants --- Power-plants --- Gasification

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Introduces the concept of combined cycles for next generation nuclear power plants, explaining how recent advances in gas turbines have made these systems increasingly desirable for efficiency gains and cost-of-ownership reduction   Promulgates modelling and analysis techniques to identify opportunities for increased thermodynamic efficiency and decreased water usage over current Light Water Reactor (LWR) systems   Examines all power conversion aspects, from the fluid exiting the reactor to energy releases into the environment, with special focus on heat exchangers and turbo-machinery   Provides examples of small projects to facilitate nuanced understanding of the theories and implementation of combined-cycle nuclear plants   This book explores combined cycle driven efficiency of next generation nuclear power plants, and describes how to model and analyze a thermally heated multi-turbine power conversion system operating with atmospheric open air as the working fluid. The included studies are intended to identify paths for future work on next generation nuclear power plants (GEN-IV and beyond), leveraging advances in natural-gas-fired turbines that enable coupling salt-cooled, helium-cooled, and sodium-cooled reactors to a Nuclear Air-Brayton Combined Cycle (NACC). These reactors provide the option of operating base-load nuclear plants with variable electricity output to the grid using natural gas or stored heat to produce peak power. The author describes overall system architecture, components, and detailed modeling results of Brayton-Rankine Combined Cycle power conversion systems and Recuperated Brayton Cycle systems, since they offer the highest overall energy conversion and output efficiencies. With ever-higher temperatures predicted in new generations of power plants, this book’s investigation of potential avenues for thermodynamic efficiency gains will be of great interest to nuclear engineers and researchers, as well as power plant operators and students.

Energy. --- Nuclear Energy. --- Thermodynamics. --- Nuclear Engineering. --- Nuclear engineering. --- Thermodynamique --- Génie nucléaire --- Mechanical Engineering --- Engineering & Applied Sciences --- Nuclear Engineering --- Nuclear power plants --- Combined cycle power plants. --- Design and construction. --- Nuclear energy. --- Power-plants --- Chemistry, Physical and theoretical --- Dynamics --- Mechanics --- Physics --- Heat --- Heat-engines --- Quantum theory --- Atomic energy --- Atomic power --- Energy, Atomic --- Energy, Nuclear --- Nuclear power --- Power, Atomic --- Power, Nuclear --- Force and energy --- Nuclear physics --- Power resources --- Nuclear engineering --- Nuclear facilities