Stephen E. Zitney
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Stephen E. Zitney has a total of 6 co-authors. Here are the top co-authors by number of shared publications:
- Benjamin Omell
The Institute for Design of Advanced Energy Systems National Energy Technology Laboratory Pittsburgh United States
1 shared publication - Debangsu Bhattacharyya
Department of Chemical and Biomedical Engineering, West Virginia University, 395 Evansdale Drive, Morgantown, West Virginia 26506-6070, United States
1 shared publication - Elijah Hedrick
Department of Chemical and Biomedical Engineering, West Virginia University, 395 Evansdale Drive, Morgantown, WV 26506-6070, USA
1 shared publication - Eric Liese
U.S. Department of Energy, Morgantown, WV
1 shared publication - Katherine Reynolds
Department of Chemical and Biomedical Engineering, West Virginia University, 395 Evansdale Drive, Morgantown, WV 26506-6070, USA
1 shared publication - Parikshit Sarda
Department of Chemical and Biomedical Engineering, West Virginia University, 395 Evansdale Drive, Morgantown, WV 26506-6070, USA
1 shared publication
Latest Publications
- Open Access
Development of a Dynamic Model and Control System for Load-Following Studies of Supercritical Pulverized Coal Power Plants
Traditional energy production plants are increasingly forced to cycle their load and operate under low-load conditions in response to growth in intermittent renewable generation. A plant-wide dynamic model of a supercritical pulverized coal (SCPC) power plant has been developed in the Aspen Plus Dynamics® (APD) software environment and the impact of advanced control strategies on the transient responses of the key variables to load-following operation and disturbances can be studied. Models of various key unit operations, such as the steam turbine, are developed in Aspen Custom Modeler® (ACM) and integrated in the APD environment. A coordinated control system (CCS) is developed above the regulatory control layer. Three control configurations are evaluated for the control of the main steam; the reheat steam temperature is also controlled. For studying servo control performance of the CCS, the load is decreased from 100% to 40% at a ramp rate of 3% load per min. The impact of a disturbance due to a change in the coal feed composition is also studied. The CCS is found to yield satisfactory performance for both servo control and disturbance rejection.
Open AccessDevelopment of a Dynamic Model and Control System for Load-Following Studies of Supercritical Pulverized Coal Power Plants
Traditional energy production plants are increasingly forced to cycle their load and operate under low-load conditions in response to growth in intermittent renewable generation. A plant-wide dynamic model of a supercritical pulverized coal (SCPC) power plant has been developed in the Aspen Plus Dynamics® (APD) software environment and the impact of advanced control strategies on the transient responses of the key variables to load-following operation and disturbances can be studied. Models of various key unit operations, such as the steam turbine, are developed in Aspen Custom Modeler® (ACM) and integrated in the APD environment. A coordinated control system (CCS) is developed above the regulatory control layer. Three control configurations are evaluated for the control of the main steam; the reheat steam temperature is also controlled. For studying servo control performance of the CCS, the load is decreased from 100% to 40% at a ramp rate of 3% load per min. The impact of a disturbance due to a change in the coal feed composition is also studied. The CCS is found to yield satisfactory performance for both servo control and disturbance rejection.
- 26 September 2017
- Published by ASME International in Journal of Engineering for Gas Turbines and Power
- Vol. 140 (1) , 011801
Using Dynamic Simulation to Evaluate Attemperator Operation in a Natural Gas Combined Cycle With Duct Burners in the Heat Recovery Steam Generator
A generic training simulator of a natural gas combined cycle (NGCC) was modified to match operations at a real plant. The objective was to use the simulator to analyze cycling operations of the plant. Initial operation of the simulator revealed the potential for saturation conditions in the final high pressure superheater (HPSH) as the attemperator tried to control temperature at the superheater outlet during gas turbine loading and unloading. Subsequent plant operational data confirmed simulation results. Multiple simulations were performed during loading and unloading of the gas turbine to determine operational strategies that prevented saturation and increased the approach to saturation temperature. The solutions included changes to the attemperator temperature control setpoints and strategic control of the steam turbine (ST) inlet pressure control valve.
- 26 September 2017
- Published by ASME International in Journal of Engineering for Gas Turbines and Power
- Vol. 140 (1) , 011801
Using Dynamic Simulation to Evaluate Attemperator Operation in a Natural Gas Combined Cycle With Duct Burners in the Heat Recovery Steam Generator
A generic training simulator of a natural gas combined cycle (NGCC) was modified to match operations at a real plant. The objective was to use the simulator to analyze cycling operations of the plant. Initial operation of the simulator revealed the potential for saturation conditions in the final high pressure superheater (HPSH) as the attemperator tried to control temperature at the superheater outlet during gas turbine loading and unloading. Subsequent plant operational data confirmed simulation results. Multiple simulations were performed during loading and unloading of the gas turbine to determine operational strategies that prevented saturation and increased the approach to saturation temperature. The solutions included changes to the attemperator temperature control setpoints and strategic control of the steam turbine (ST) inlet pressure control valve.