Effect of disturbances on MED-TVC plant characteristics: Dynamic modeling and simulation

Elsayed, Mohamed L.; Mesalhy, Osama; Mohammed, Ramy H.; Chow, L. C.

doi:10.1016/j.desal.2018.05.021

Cited by 28 publications

(3 citation statements)

References 32 publications

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“…The results showed that the specific power consumption, solar field area and the thermo-economic cost could be reduced through reducing the compression ratio and increasing the number of evaporators. Hybrid MED plants as well as thermal-based desalination include other systems such as the vapor compression distillation (VC) were studied [66][67][68][69]. The results showed an increase in water production due to hybridization and vapor compression systems.…”

Section: Multiple Effect Distillation (Med)mentioning

confidence: 99%

Nuclear desalination: A state-of-the-art review

et al. 2019

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Thermal desalination is an energy intensive process that satisfies its requirement from conventional fossil fuel sources. Current research efforts aim at finding alternatives for fossil fuels to power thermal desalination. Nuclear energy offers a feasible option for power cogeneration and production of fresh water due to the significant amount of recovered useful heat. The heat is exploited to produce steam and generate electricity on-site to power thermal and membrane desalination facilities. Large or small/medium nuclear reactors (SMR) can be used. This paper reviews the various aspects of nuclear desalination, the different nuclear reactors that have been coupled with desalination processes, and the hybrid desalination systems coupled with nuclear reactors. It also discusses the safety and public acceptance for the nuclear desalination practices as well as the latest economic studies and assessments for on -site nuclear desalination power plants.Ten main projects around the world are primarily operated as nuclear desalination plants. The major desalination processes coupled with nuclear SMRs are MSF, MED and RO. The cost of water production using nuclear desalination was estimated to range from 0.4 $/m 3 to 1.8 $/m 3 depending on the type of reactor and the desalination process used.

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Section: Multiple Effect Distillation (Med)mentioning

confidence: 99%

Nuclear desalination: A state-of-the-art review

et al. 2019

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“…The outcomes they obtained indicated that such models can effectively depict the system's dynamic response in relation to all its factors, making it a valuable resource for forecasting temporary operations and designing control systems for MED-TVC facilities. Elsayed, Mohamed L., et al [9] presented a detailed analysis of the transient and steady-state performance of a MED-TVC unit. They showed that when the system experiences sudden changes in such parameters as motive steam flow rate, flow rate, and temperature of the cooling seawater, the plant performance is severely affected.…”

Section: Introductionmentioning

confidence: 99%

4E Transient Analysis of a Solar-Hybrid Gas-Turbine Cycle Equipped with Heliostat and MED

Ghasemiasl,

Dehghanizadeh,

Javadi

et al. 2023

Sustainability

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The current study investigates a cogeneration cycle of power and freshwater integrated with a solar system. The solar system is of the heliostat type, which is considered to preheat the inlet air in the combustion chamber of a 25-MW gas turbine. The waste heat of the turbine output stream is used to produce freshwater. Parameters such as the ambient temperature and solar irradiance significantly affect the system’s performance; hence, all analyses, including those pertaining to energy, exergy, economics, and environment, were conducted transiently, with a one-hour time step throughout the year so that the impacts of these effective parameters could be examined. Besides the analysis assuming a constant mass flow rate for the air entering the compressor, the calculations were repeated with the assumption of a constant volumetric flow rate to evaluate the cycle in the same conditions as those of natural gas power plants. Given the constant volumetric flow rate, for every 10-degree increase in temperature, the compressor power consumption decreased by approximately 2%. Moreover, a sensitivity analysis of the cycle performance in terms of ambient temperature was performed, and the corresponding results are presented. Finally, some correlations are presented to estimate variations in compressor power consumption and net turbine power due to temperature variations. The results demonstrate that in Bushehr, Iran, every one-degree increase in ambient temperature leads to an approximately 0.67 percentage decrease in net-generated power. In the end, the performance of the cycle was investigated under climatic conditions and solar irradiation intensities in several cities in Iran and some cities in different countries in which heliostat power plants have already been established. The results obtained in these cities were compared; it was concluded that the lowest annual cost of electricity generation is related to Isfahan in Iran, which reduces the cost of electricity generation by more than 20% (2.32 Cents/kWh) compared to the base cycle.

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“…Georgiou and Bonanos [22] modeled transient behavior for FF-MED, but the studied plant was not integrated to TVC and there are no preheaters, and they did not mention the assumptions in building the code; additionally, the dynamic behavior was confined to the change in the amount of heat supplied to the circuit. Elsayed et al, [10,23] studied the four types of MED plant, and made a clear comparison between them, but only the type PCF-MED was integrated to TVC, also there are no preheaters.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Modeling and Simulation of the Forward Feed MED-TVC Desalination Plant

Habib

Hamed

Youssef

et al. 2022

ARFMTS

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The sudden disturbances in the operating parameters of desalination plants are common, especially when these plants are integrated with concentrated solar power (CSP). These disturbances damage the plants over time and may lead to a complete shutdown. This paper aims to investigate the performance of a forward feed multi-effect distillation plant with a thermal vapor compressor (FF-MED-TVC) which has a high potential for integration with concentrated solar power (CSP). However, the fluctuation and instability of solar energy require the development of dynamic model for the MED process to analyze the transient behavior. Few papers were published in the transient state, especially the forward feed (FF) configuration, as most of the papers focused on the parallel feed (PF) and parallel cross feed (PCF) configuration. Accordingly, a mathematical model has been developed using Engineering Equation Solver (EES) software and validated against data reported from two previous models in the literature, where a perfect agreement was obtained. Then the proposed model was employed to predict the system's response to the most important parameters that may change suddenly in the real operating environment, such as the variation in the motive steam pressure, feed seawater mass flow rate, and temperature. For the same percentage (10%) of these three disturbances, the results indicated that the needed time to return to 95 % of steady state is the longest in the case of increasing the seawater mass flow rate (about 350 seconds after the turbulence is removed), while it is the shortest in the case of increasing the pressure of motive steam (about 50 seconds after the turbulence is removed). In this paper, a comprehensive analysis of the transient performance was performed and a clearer view of the dynamic response was given which enables to optimize the control strategy and improve the stability.

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Effect of disturbances on MED-TVC plant characteristics: Dynamic modeling and simulation

Cited by 28 publications

References 32 publications

Nuclear desalination: A state-of-the-art review

Nuclear desalination: A state-of-the-art review

4E Transient Analysis of a Solar-Hybrid Gas-Turbine Cycle Equipped with Heliostat and MED

Dynamic Modeling and Simulation of the Forward Feed MED-TVC Desalination Plant

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