Energetic and exergetic analysis of cogeneration power combined cycle and ME-TVC-MED water desalination plant: Part-1 operation and performance

Almutairi, Abdulrahman; Pilidis, Pericles; Al-Mutawa, Nawaf; Al-Weshahi, Mohammed A.

doi:10.1016/j.applthermaleng.2016.02.121

Cited by 48 publications

(10 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The waste exergy rates for all the main components of the MED-TVC under design conditions, for both proposed modes, are shown in Figure 10. The major waste exergy occurs in the ejector (thermo-compressor) due to the mixing process, its configuration produces high fuel exergy, as confirmed by [22]. The second greatest waste takes place in the effects due to temperature differences and the separation process.…”

Section: Streammentioning

confidence: 82%

Energetic, Exergetic, and Economic Analysis of MED-TVC Water Desalination Plant with and without Preheating

Eshoul¹,

Almutairi

Lamidi

et al. 2018

Water

Self Cite

View full text Add to dashboard Cite

Desalination is the sole proven technique that can provide the necessary fresh water in arid and semi-arid countries in sufficient quantities and meet the modern needs of a growing world population. Multi effect desalination with thermal vapour compression (MED-TVC) is one of most common applications of thermal desalination technologies. The present paper presents a comprehensive thermodynamic model of a 24 million litres per day thermal desalination plant, using specialised software packages. The proposed model was validated against a real data set for a large-scale desalination plant, and showed good agreement. The performance of the MED-TVC unit was investigated using different loads, entrained vapour, seawater temperature, salinity and number of effects in two configurations. The first configuration was the MED-TVC unit without preheating system, and the second integrated the MED-TVC unit with a preheating system. The study confirmed that the thermo-compressor and its effects are the main sources of exergy destruction in these desalination plants, at about 40% and 35% respectively. The desalination plant performance with preheating mode performs well due to high feed water temperature leading to the production of more distillate water. The seawater salinity was proportional to the fuel exergy and minimum separation work. High seawater salinity results in high exergy efficiency, which is not the case with membrane technology. The plant performance of the proposed system was enhanced by using a large number of effects due to greater utilisation of energy input and higher generation level. From an economic perspective, both indicators show that using a preheating system is more economically attractive.

show abstract

Section: Streammentioning

confidence: 82%

Energetic, Exergetic, and Economic Analysis of MED-TVC Water Desalination Plant with and without Preheating

Eshoul¹,

Almutairi

Lamidi

et al. 2018

Water

Self Cite

View full text Add to dashboard Cite

show abstract

“…The steam turbines consume another 20% of remaining fuel exergy and bled steam carry only 4 ± 1% exergy for desalination cycles. The remaining exergy is dumped into the condenser in the form of dead steam and lost in process irreversibilities [ 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Desalination Processes’ Efficiency and Future Roadmap

Shahzad

Burhan

Ybyraiymkul

et al. 2019

Entropy

View full text Add to dashboard Cite

For future sustainable seawater desalination, the importance of achieving better energy efficiency of the existing 19,500 commercial-scale desalination plants cannot be over emphasized. The major concern of the desalination industry is the inadequate approach to energy efficiency evaluation of diverse seawater desalination processes by omitting the grade of energy supplied. These conventional approaches would suffice if the efficacy comparison were to be conducted for the same energy input processes. The misconception of considering all derived energies as equivalent in the desalination industry has severe economic and environmental consequences. In the realms of the energy and desalination system planners, serious judgmental errors in the process selection of green installations are made unconsciously as the efficacy data are either flawed or inaccurate. Inferior efficacy technologies’ implementation decisions were observed in many water-stressed countries that can burden a country’s economy immediately with higher unit energy cost as well as cause more undesirable environmental effects on the surroundings. In this article, a standard primary energy-based thermodynamic framework is presented that addresses energy efficacy fairly and accurately. It shows clearly that a thermally driven process consumes 2.5–3% of standard primary energy (SPE) when combined with power plants. A standard universal performance ratio-based evaluation method has been proposed that showed all desalination processes performance varies from 10–14% of the thermodynamic limit. To achieve 2030 sustainability goals, innovative processes are required to meet 25–30% of the thermodynamic limit.

show abstract

“…According to the published literature based on convention energetic analysis, the gas turbines (GT) consumes 72 ± 3% of the input fuel exergy and the heat recovery steam generator (HRSG) salvages up to 28 ± 3% of the remaining exergy of fuel from the GT exhaust gases to generate steam for steam turbine cycle. 17,18 Only a fraction 4 ± 1% of the input exergy is bled-off as a lowgrade steam that matches thermodynamically the evaporative requirements of thermally driven desalination processes. This concept of maximizing the thermodynamic exergy of primary fuel for the simultaneous production of electricity and desalinated water is therefore deemed as the de facto standard.…”

Section: Introductionmentioning

confidence: 99%

A standard primary energy approach for comparing desalination processes

2019

View full text Add to dashboard Cite

Considering different grades of energy as equivalent in the desalination industry could have negative economic and environmental consequences. Whereas this approach will suffice for the comparison of same energy input processes, omitting the grade of energy when comparing diverse technologies may lead to incorrect conclusions and, resultantly, inefficient installations. Here, a standard primary energy-based thermodynamic framework is presented that addresses the energy efficacy of assorted desalination processes. Example calculations show that a thermal desalination plant integrated with a power plant consumes 2-3% of input standard primary energy. We also propose a standard universal performance ratio methodology to provide a level playing field for the comparison of desalination processes; this suggest that the majority of desalination processes are operating far from the sustainable zone, with only~10-13% at the ideal or thermodynamic limit. A proposed roadmap shows that attaining an efficacy level of up to 25-30% of the thermodynamic limit is crucial for achieving the 2030 sustainability development goals for seawater desalination, which will require a technological shift in the capability of dissolved salts separation processes.

show abstract

Energetic and exergetic analysis of cogeneration power combined cycle and ME-TVC-MED water desalination plant: Part-1 operation and performance

Cited by 48 publications

References 14 publications

Energetic, Exergetic, and Economic Analysis of MED-TVC Water Desalination Plant with and without Preheating

Energetic, Exergetic, and Economic Analysis of MED-TVC Water Desalination Plant with and without Preheating

Desalination Processes’ Efficiency and Future Roadmap

A standard primary energy approach for comparing desalination processes

Contact Info

Product

Resources

About