Effect of input parameters intensity and duration on dynamic performance of MED-TVC plant
Abstract
Multi-Effect-Desalination (MED) may be exposed to fluctuations (disturbances) in input parameters during operation. Therefore, there is a requirement to analyze the transient behavior of such MED systems. In this work, a dynamic model is developed and used to examine the effect of abrupt and ramp changes in the main operational parameters on the plant behavior and performance. The results show that the disturbance intensity variation has a major role in the desalination plant behavior. For the current MED-TVC configuration, it is recommended to limit the reduction in the seawater cooling flow rate to under 12% of the designed steady-state value to avoid dry out in the evaporators. Here, a reduction in the motive steam flow rate and cooling seawater temperature of more than 20% and 35% of the nominal operating values, respectively, may lead to flooding in the evaporators and a complete plant shutdown. On the other hand, the disturbance period has a minimal effect on plant performance if it avoids the critical values of the disturbance intensity that can cause plant shutdown. Simultaneous combinations of two different disturbances with opposing effects result in a modest effect on the plant operation and they can be used to control and mitigatemore »
- Authors:
-
- Univ. of Central Florida, Orlando, FL (United States); Zagazig Univ. (Egypt)
- Univ. of Central Florida, Orlando, FL (United States)
- Publication Date:
- Research Org.:
- Savengy Technologies, LLC, Orlando, FL (United States)
- Sponsoring Org.:
- USDOE; Egyptian Ministry of Research and Higher Education
- OSTI Identifier:
- 1594007
- Alternate Identifier(s):
- OSTI ID: 1582769
- Grant/Contract Number:
- SC0015809
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Thermal Engineering
- Additional Journal Information:
- Journal Volume: 137; Journal Issue: C; Journal ID: ISSN 1359-4311
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; Seawater desalination; Multiple effect distillation; Steam ejectors; Dynamic disturbance
Citation Formats
Elsayed, Mohamed L., Mesalhy, Osama, Mohammed, Ramy H., and Chow, Louis C. Effect of input parameters intensity and duration on dynamic performance of MED-TVC plant. United States: N. p., 2018.
Web. doi:10.1016/j.applthermaleng.2018.03.106.
Elsayed, Mohamed L., Mesalhy, Osama, Mohammed, Ramy H., & Chow, Louis C. Effect of input parameters intensity and duration on dynamic performance of MED-TVC plant. United States. https://doi.org/10.1016/j.applthermaleng.2018.03.106
Elsayed, Mohamed L., Mesalhy, Osama, Mohammed, Ramy H., and Chow, Louis C. Sat .
"Effect of input parameters intensity and duration on dynamic performance of MED-TVC plant". United States. https://doi.org/10.1016/j.applthermaleng.2018.03.106. https://www.osti.gov/servlets/purl/1594007.
@article{osti_1594007,
title = {Effect of input parameters intensity and duration on dynamic performance of MED-TVC plant},
author = {Elsayed, Mohamed L. and Mesalhy, Osama and Mohammed, Ramy H. and Chow, Louis C.},
abstractNote = {Multi-Effect-Desalination (MED) may be exposed to fluctuations (disturbances) in input parameters during operation. Therefore, there is a requirement to analyze the transient behavior of such MED systems. In this work, a dynamic model is developed and used to examine the effect of abrupt and ramp changes in the main operational parameters on the plant behavior and performance. The results show that the disturbance intensity variation has a major role in the desalination plant behavior. For the current MED-TVC configuration, it is recommended to limit the reduction in the seawater cooling flow rate to under 12% of the designed steady-state value to avoid dry out in the evaporators. Here, a reduction in the motive steam flow rate and cooling seawater temperature of more than 20% and 35% of the nominal operating values, respectively, may lead to flooding in the evaporators and a complete plant shutdown. On the other hand, the disturbance period has a minimal effect on plant performance if it avoids the critical values of the disturbance intensity that can cause plant shutdown. Simultaneous combinations of two different disturbances with opposing effects result in a modest effect on the plant operation and they can be used to control and mitigate the flooding/drying effects of the disturbances. For simultaneous combinations of disturbances with similar effect, the plant needs an accurate control system to avoid an operational shutdown.},
doi = {10.1016/j.applthermaleng.2018.03.106},
journal = {Applied Thermal Engineering},
number = C,
volume = 137,
place = {United States},
year = {Sat Mar 31 00:00:00 EDT 2018},
month = {Sat Mar 31 00:00:00 EDT 2018}
}
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