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Husnil, Yuli Amalia,Andika, Riezqa,Lee, Moonyong Elsevier 2019 Journal of process control Vol.74 No.-
<P><B>Abstract</B></P> <P>This paper discusses plant-wide control system design of the wet sulfuric acid (WSA) process, which is part of an integrated gasification combined cycle power plant. The regulatory control structure, which ensures energy efficiency and operational stability, was designed by addressing the requirements and constraints of each key unit in the process. We used sensitivity analysis and simple stoichiometric calculation to obtain optimum set points for the controlled variables, which has a direct effect on the energy usage and production rate in the WSA process. In this work, we proposed several controller schemes that ensure efficiency and stability of the WSA process. The results of this work will contribute to improving the process efficiency, thereby facilitating energy efficient and stable operation of the WSA process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Plant wide control of wet sulfuric acid (WSA) process in IGCC power plant was studied. </LI> <LI> A simple procedure to calculate minimum required hot air to combustor was utilized. </LI> <LI> Sensitivity analysis was implemented to find optimum set-points of major controlled variables of WSA process. </LI> <LI> Several controller schemes were proposed in achieving enhanced energy efficiency and operational stability. </LI> </UL> </P>
Husnil, Yuli Amalia,Harvianto, Gregorius Rionugroho,Andika, Riezqa,Chaniago, Yus Donald,Lee, Moonyong Elsevier 2017 Desalination Vol.409 No.-
<P><B>Abstract</B></P> <P>The main aim of this study was to conduct preliminary analysis on the performance of two conceptual designs that integrate the production of potable water, electricity, and salt. We used reverse osmosis (RO), pressure-retarded osmosis (PRO), and electrodialysis (ED) to produce potable water, electricity, and salt, respectively. The objective of the analysis is to observe how the relative positions of RO and PRO in the integrated process affect the five key parameters, i.e. the total dissolved solids (TDS) of potable water, permeate rate, the total energy requirement of the RO and ED units, net delivered power, and salt potential. We simulated each integrated design using previously validated mathematical expressions of RO, PRO, and ED. We found that the net delivered power is higher when the RO unit is located before the PRO unit. The same sequence also results in lower energy requirement for producing potable water, although the permeate rate is smaller than that of the rival sequence. On the other hand, the salt potential is not affected by the relative positions of the RO and PRO units.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Integrated process for the production of potable water, electricity, and salt </LI> <LI> Process simulation analysis for the integrated process system </LI> <LI> The effects of different water sources and temperature in the process are studied. </LI> <LI> The design proposed represents a feasible option for the production of water, electricity, and salt </LI> </UL> </P>
Synthesis of an Optimizing Control Structure for Dual Mixed Refrigerant Process
Husnil, Yuli Amalia,Lee, Moonyong Society of Chemical Engineers, Japan 2014 Journal of chemical engineering of Japan Vol.47 No.8
<P> This study examines the optimal operation of the dual mixed refrigerant (DMR) process by steady-state optimality analysis. The purpose of this analysis is to discover the optimizing variable that can maintain the DMR process in the optimal compressor duty. First, a rigorous dynamic simulation of the DMR process was built in the Aspen Hysys interface. Second, numerous step tests on the refrigerant flow rate were conducted and the resulting total compressor duty was recorded. The steady-state operational map that correlates the refrigerant flow rate and total compressor duty was drawn to locate the optimal operation region of the DMR process. The map also contains information on the state variables in the DMR process that in particular combinations, will allow the process to be operated at the optimal compressor duty. The comprehensive information on the map makes it an excellent tool for selecting the proper optimizing variable for the DMR process. The resulting steady-state optimality map suggests that, when the flow rate ratio of the two refrigerants (WMR/CMR ratio) is kept constant, the operational of DMR process will remain within optimal region. This suggests that the WMR/CMR ratio is the proper optimizing variable for the DMR process. From a control viewpoint, the control structure that includes the WMR/CMR ratio loop also showed excellent performance compared to the other possible structures in terms of maintaining the stability and fulfilling the control objectives of the DMR process. </P>
Riezqa Andika,이문용,Yuli Amalia Husnil 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.7
Although fossil fuels play an important role as the primary energy source that currently cannot be replacedeasily with other energy sources, their depletion and environmental impact are becoming major concerns. Improvementsin energy efficiency are believed to solve both problems simultaneously. We examined the relationships betweenthe improvement in energy efficiency, energy usage and CO2 emissions in industry, especially in the distillation process. The energy efficiency improvement of dimethyl ether (DME) purification performed with dividing-wall column distillation(DWC) and acetic acid recovery performed with mechanical vapor recompression (MVR) were evaluated byrecalculating the amount of fuel burnt and its CO2 emission. The results showed that the paradigm of lower energybeing directly proportional to lower CO2 emissions is not entirely correct. To avoid this confusion, a tool for examiningthe uncommon behavior of various systems was developed.
Robust Control of Propane Pre-Cooled Mixed Refrigerant Process for Natural Gas Liquefaction
Mohd Shariq Khan,Mun Kyu Yoon,Yuli Amalia Husnil,Moonyong Lee 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
Natural Gas are often found at remote locations to bring it to the world market liquefaction is required [1]. In liquefaction natural gas is cooled to around -160℃, hence required considerable amount of energy. To maximize the profit from the existing design it is necessary that the process should operate efficiently, reliably and safely. Hence a good and Robust control is required. Due to tight control strategy the stability is an issue in the main cryogenic heat exchanger(MCHE) and in the Refrigerant flash drum. In this study the C3MR process was considered and the dynamic model was made in Hysys simulator and used to implement the proposed control algorithm. By judiciously choosing control variables we have proposed more robust control strategy and its performance was observed under simulation environment which provide satisfactory robustness for stability and performance.