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Nonlinear dynamics and control of bifurcation to regulate the performance of a boiler-turbine unit
, Article Energy Conversion and Management ; Vol. 68 , 2013 , pp. 105-113 ; ISSN: 01968904 ; Alasty, A ; Vossoughi, G ; Sharif University of Technology
Abstract
The economical operations of power plants and environmental awareness are the major factors affecting the importance of control in boiler-turbine units. In this paper, a multivariable nonlinear model of boiler-turbine unit is considered. Drum pressure, electric output and water level of drum (as output variables) are adjusted at desired values by manipulation of valve positions for fuel, steam and feed-water flow rates (as input variables). Nonlinear dynamics of the unit is investigated through the concepts of bifurcation and limit cycles behaviour. In the presence of harmonic disturbances, some coefficients of the dynamic model, fuel and steam flow rates play as the bifurcation parameters....
Nonlinear dynamics and control of bifurcation to regulate the performance of a boiler-turbine unit
, Article Energy Conversion and Management ; Volume 68 , 2013 , Pages 105-113 ; 01968904 (ISSN) ; Alasty, A ; Vossoughi, G ; Sharif University of Technology
2013
Abstract
The economical operations of power plants and environmental awareness are the major factors affecting the importance of control in boiler-turbine units. In this paper, a multivariable nonlinear model of boiler-turbine unit is considered. Drum pressure, electric output and water level of drum (as output variables) are adjusted at desired values by manipulation of valve positions for fuel, steam and feed-water flow rates (as input variables). Nonlinear dynamics of the unit is investigated through the concepts of bifurcation and limit cycles behaviour. In the presence of harmonic disturbances, some coefficients of the dynamic model, fuel and steam flow rates play as the bifurcation parameters....
Comparing the performance and recovery mechanisms for steam flooding in heavy and light oil reservoirs
, Article Society of Petroleum Engineers- SPE Heavy Oil Conference ; Volume 1 , 2012 , Pages 28-36 ; 9781622761111 (ISBN) ; Ayatollahi, S ; Shabaninejad, M ; Sharif University of Technology
SPE
2012
Abstract
The concern over fossil energy shortage for the next decade leads to the extensive research activities in the area of enhanced oil recovery. Steam injection as one of well known EOR process has been used for about five decades to improve the oil production rate and recovery efficiency. Steam flooding is applied to heavy and extra-heavy oil reservoirs; however it could be used in light oil reservoirs in which water injection do not work effectively. Regardless of different performances, this method is an efficient EOR process for both heavy and light oil reservoirs. In this work, two separate numerical models were prepared to investigate steam flooding performance for the recovery of light...