Multivariable feedwater control design for a steam generator

Younkins, T. D.; Chow, Joe H.

doi:10.1109/37.1878

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…One of the design objectives was to minimize blowdown from the drums during start-ups. The results showed the improvement of the proposed design over the traditional singleloop feedwater control design, (Younkins and Chow, 1988). A mathematical model for the dynamic analysis of a vertical reheat boiler and the application of this model to the optimal design of a drum water level controller was presented.…”

Section: Introductionmentioning

confidence: 88%

Experimental Investigation and Mathematical Modelling of Pressure Response for Steam Generator

Abdulkareem¹

2018

IJET

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Cold startup of boiler is the process of boiler operation with water at ambient temperature and pressure with all intake and discharge valves are fully closed to permit fast development of pressure. A mathematical model is developed to estimate the pressure response during cold startup of a perfectly insulated steam generator unit. A commercial type pressure switch is used in this unit to control and maintain the desired set point of the steam operating pressure. This mathematical model assume that the thermal properties of t he supplied liquid water are temperature dependent. It is based on a novel Pressure Marching Technique that is coded using a FORTRAN language computer program. The maximum percentage error of (8.24 %) was obtained when comparing the predicted results of the mathematical model with the measured values obtained from the experimental test that was done using a (2 kW) electric steam generator unit with a volume of (30 litter) and maximum operating pressure of (8 bar). In addition, the same behavior of the predicted results was obtained when compared with results of a previously published article. It was found that the time constant of the pressure control system is directly proportional with its operating pressure set point and with the volume of the steam generator and its void fracti on. A (50%) increase in the pressure set point will increase the time constant by (66.16%). Increasing the boiler volume by (166.667%) will increase the time constant by (166.677%) and increasing the boiler void fraction by (150%) will increase the time constant by (23.634%). The time constant is inversely proportional with the heating power of the steam generator. A (100%) increase in the heating power will decrease the time constant by (50%). The time constant is independent of the initial water temperature. Also, it was found that the time delay to start water evaporation is directly proportional with the volume of the steam generator. A (166.667%) increase in boiler volume will increase the time delay by (166.65%). The time delay is inversely proportional with the initial water temperature and with the heating power and void fraction of the steam generator. A (38.889%) increase in the initial water temperature will decrease the time delay by (8.882%). Increasing the heating power by (100%) will decrease the time delay by (50%) and increasing the boiler voi d fraction by (150%) will decrease the time delay by (16.665%). The time delay is independent on the operating pressure set point.

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Section: Introductionmentioning

confidence: 88%

Experimental Investigation and Mathematical Modelling of Pressure Response for Steam Generator

Abdulkareem¹

2018

IJET

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“…Modeling the entire hybrid solar power plant is a critical task considering all the factors for real-time inputs and effects. Various modeling approaches have been conducted and reported by several authors, with differences in relaxing certain factors in their modeling approach [26], [27]. If a sufficient modeling effort is constructed by appropriately considering major factors, the controller design for set-point operation and an effective power plant operation based on optimization requires less effort.…”

Section: Modeling Of Solar Collectorsmentioning

confidence: 99%

Solar Collectors Modeling and Controller Design for Solar Thermal Power Plant

2020

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Electric power generation techniques utilizing solar energy urge scientists to research and develop technologies using sustainable resources on a large scale with qualities close to the ideal resource. Solar collectors are crucial components of a Solar Thermal Power plant (STP) which are required to be within a certain feasible range in order to operate and provide solar thermal resources and intermittent inputs. The closed-loop controller design for solar collectors enhances the lifespan of STP. This paper presents first principle modeling of Parabolic Trough Collector (PTC) using therminol oil and Linear Fresnel Reflector (LFR) design using water as working fluid. Using step test method linear transfer function obtained at continuous and discrete domain nominal operating range. A continuous Proportional Integral (PI) controller is designed either with Static Feed Forward (SFF) control or with Predictive Function Control (PFC). Optimal performance of the controller is based on performance indicators obtained through various case studies. INDEX TERMS Solar thermal power plant, proportional integral, parabolic trough collector, linear fresnel reflector, static feed forward, predictive function control.

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References

2019

Power System Modeling, Computation, and Control

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Multivariable feedwater control design for a steam generator

Cited by 7 publications

References 4 publications

Experimental Investigation and Mathematical Modelling of Pressure Response for Steam Generator

Experimental Investigation and Mathematical Modelling of Pressure Response for Steam Generator

Solar Collectors Modeling and Controller Design for Solar Thermal Power Plant

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