The Experts below are selected from a list of 24 Experts worldwide ranked by ideXlab platform
Hartmut Spliethoff - One of the best experts on this subject based on the ideXlab platform.
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Investigation of Different Operation Strategies to Provide Balance Energy With an Industrial Combined Heat and Power Plant Using Dynamic Simulation
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2016Co-Authors: S. Kahlert, Hartmut SpliethoffAbstract:Intermittency of renewable electricity generation poses a challenge to thermal power plants. While power plants in the public sector see a decrease in operating hours, the utilization of industrial power plants is mostly unaffected because process steam has to be provided. This study investigates to what extent the load of a combined heat and power (CHP) plant can be reduced while maintaining a reliable process steam supply. A dynamic process model of an industrial combined CHP plant is developed and validated with operational data. The model contains a gas turbine (GT), a single pressure heat recovery system generator (HRSG) with supplementary firing and an extraction condensing steam turbine. Technical limitations of the gas turbine, the supplementary firing, and the steam turbine constrain the load range of the plant. In consideration of these constraints, different operation strategies are performed at variable loads using dynamic simulation. A simulation study shows feasible load changes in 5 min for provision of secondary Control reserve (SCR). The load change capability of the combined cycle plant under consideration is mainly restricted by the water–steam cycle. It is shown that both the low pressure Control Valve (LPCV) of the extraction steam turbine and the high pressure Bypass Control Valve are suitable to ensure the process steam supply during the load change. The Controllability of the steam turbine load and the process stability are sufficient as long as the supplementary is not reaching the limits of the operating range.
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Investigation of Different Operation Strategies to Provide Balance Energy With an Industrial CHP Plant Using Dynamic Simulation
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2016Co-Authors: S. Kahlert, Hartmut SpliethoffAbstract:Intermittency of renewable electricity generation poses a challenge to thermal power plants. While power plants in the public sector see a decrease in operating hours, the utilization of industrial power plants is mostly unaffected because process steam has to be provided. This study investigates to what extent the load of a CHP plant can be reduced while maintaining a reliable process steam supply. A dynamic process model of an industrial combined CHP plant is developed and validated with operational data. The model contains a gas turbine, a single pressure HRSG with supplementary firing and an extraction condensing steam turbine. Technical limitations of the gas turbine, the supplementary firing and the steam turbine constrain the load range of the plant. In consideration of these constraints, different operation strategies are performed at variable loads using dynamic simulation. A simulation study shows feasible load changes in 5 min for provision of secondary Control reserve. The load change capability of the combined cycle plant under consideration is mainly restricted by the water-steam cycle. It is shown that both the low pressure Control Valve of the extraction steam turbine and the high pressure Bypass Control Valve are suitable to ensure the process steam supply during the load change. The Controllability of the steam turbine load and the process stability are sufficient as long as the supplementary is not reaching the limits of the operating range.
S. Kahlert - One of the best experts on this subject based on the ideXlab platform.
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Investigation of Different Operation Strategies to Provide Balance Energy With an Industrial Combined Heat and Power Plant Using Dynamic Simulation
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2016Co-Authors: S. Kahlert, Hartmut SpliethoffAbstract:Intermittency of renewable electricity generation poses a challenge to thermal power plants. While power plants in the public sector see a decrease in operating hours, the utilization of industrial power plants is mostly unaffected because process steam has to be provided. This study investigates to what extent the load of a combined heat and power (CHP) plant can be reduced while maintaining a reliable process steam supply. A dynamic process model of an industrial combined CHP plant is developed and validated with operational data. The model contains a gas turbine (GT), a single pressure heat recovery system generator (HRSG) with supplementary firing and an extraction condensing steam turbine. Technical limitations of the gas turbine, the supplementary firing, and the steam turbine constrain the load range of the plant. In consideration of these constraints, different operation strategies are performed at variable loads using dynamic simulation. A simulation study shows feasible load changes in 5 min for provision of secondary Control reserve (SCR). The load change capability of the combined cycle plant under consideration is mainly restricted by the water–steam cycle. It is shown that both the low pressure Control Valve (LPCV) of the extraction steam turbine and the high pressure Bypass Control Valve are suitable to ensure the process steam supply during the load change. The Controllability of the steam turbine load and the process stability are sufficient as long as the supplementary is not reaching the limits of the operating range.
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Investigation of Different Operation Strategies to Provide Balance Energy With an Industrial CHP Plant Using Dynamic Simulation
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2016Co-Authors: S. Kahlert, Hartmut SpliethoffAbstract:Intermittency of renewable electricity generation poses a challenge to thermal power plants. While power plants in the public sector see a decrease in operating hours, the utilization of industrial power plants is mostly unaffected because process steam has to be provided. This study investigates to what extent the load of a CHP plant can be reduced while maintaining a reliable process steam supply. A dynamic process model of an industrial combined CHP plant is developed and validated with operational data. The model contains a gas turbine, a single pressure HRSG with supplementary firing and an extraction condensing steam turbine. Technical limitations of the gas turbine, the supplementary firing and the steam turbine constrain the load range of the plant. In consideration of these constraints, different operation strategies are performed at variable loads using dynamic simulation. A simulation study shows feasible load changes in 5 min for provision of secondary Control reserve. The load change capability of the combined cycle plant under consideration is mainly restricted by the water-steam cycle. It is shown that both the low pressure Control Valve of the extraction steam turbine and the high pressure Bypass Control Valve are suitable to ensure the process steam supply during the load change. The Controllability of the steam turbine load and the process stability are sufficient as long as the supplementary is not reaching the limits of the operating range.
W.e. Bill Forsthoffer - One of the best experts on this subject based on the ideXlab platform.
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Component design Control Valves and instrumentation
Forsthoffer's Rotating Equipment Handbooks, 2020Co-Authors: W.e. Bill ForsthofferAbstract:This chapter examines the function, sizing, and selection of auxiliary system components, namely Controls and instrumentation. The function of the Controls and instrumentation is to continuously supply fluid to each specified point at the required pressure, temperature, and flow rate. System Controls modify the operational characteristics of these components to achieve the desired results. All system Controls and instrumentation must function perfectly under both steady state and transient conditions. Under normal operation, a steady state Control mode is approached because flows, pressures, and temperatures change very slowly if at all. A Bypass Control Valve and actuator are used with a positive displacement pump to alter the pump's flow characteristic to that of variable flow. If the Valve system experiences instabilities or excessive friction, as in the case of Valve stem binding, the system will experience an instantaneous loss of flow and will be shut down on this signal. The primary application for pressure reducing Valves in auxiliary systems is for reducing system pressure to other desired pressure levels.
Ji-dong Lu - One of the best experts on this subject based on the ideXlab platform.
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Research on operating characteristics of direct-return chilled water system Controlled by variable temperature difference
Energy, 2012Co-Authors: Ji-dong LuAbstract:Terminal load distribution and pipe network structure are the key factors that affect the energy-saving potential of central air-conditioning chilled water systems, nonlinear thermodynamic performance of an air-conditioning system with large inertia will mainly exert influence on the stability and reliability of energy-saving operation Control. Unreasonable variable flow Control strategy can neither achieve an ideal energy-saving effect nor meet the air-conditioning comfortableness requirements. With a direct-return chilled water system as study object, this paper built a hydraulic calculation model of pipe network topology, Bypass loop hydraulic calculation model, AHU thermodynamic model, and water pump variable frequency operation model. Operating frequency of a water pump for different flow ratio, pump power, temperature difference of pipe network supply and return water, pressure difference of pipe network supply and return water, Bypass Control Valve characteristics, system adjustability coefficient, and pipe network resistance characteristics of a chilled water system are studied under the condition of given supply water temperature, and pipe network’s AHU node thermal and humid load. And energy consumption characteristics of constant temperature difference Control and variable temperature difference Control are also analyzed with comparison. The results can provide theoretical guidance for the stable and reliable energy-saving operation of a chilled water system.
Daniel Klajnowski - One of the best experts on this subject based on the ideXlab platform.
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New Valves boost Mohammedia
Modern power systems, 2020Co-Authors: Mdarhri Abdellah, Poopak Mousavi, Daniel KlajnowskiAbstract:Ever since the four 150 MW coal-fired units of the Mohammedia plant went on line in 1980/81, auxiliary steam and turbine Bypass Control Valve operation has been increasingly unsatisfactory. Advanced multistage pressure reduction technology has solved the problems.
