DYNAMIC MODELING OF MSF DESALINATION PLANTS
Mahmoud Samy Ahmed Shousha;
Abstract
Dynamic modeling is performed on multi-stage flashing (MSF) recirculation desalination plant. The plant which is divided into three sections; a heat reject section, a heat recovery section and a brine heater section, comprises of three (3) heat reject stages, eighteen (18) heat recovery stages and one (1) brine heater.
Governing equations for total material, salt and air & non-condensable gases balance and energy balance are formalized for one of the middle stages and for the brine heater on transient behavior.
Terminal conditions are determined to identify the first and last heat recovery and heat reject stages.
The governing equations for any stage are based on the splitting of the stage into four compartments, the brine pool, the vapor space, the product tray and the tube bundle. The brine heater is also splitted into two compartments the combined shell and sump and the tube bundle.
The derivation forms of the equations representing the thermal and physical properties of fresh and salt water as functions of temperature and salinity are obtained.
Equations representing the tube bundles overall heat transfer coefficients and the distillate and flashing brine temperature correlations were obtained.
The mathematical model considers the effect of variation of fouling factors with the operating hours, presence of air & non-condensable gases and leakage of vapor and non-condensable gases to the ejector and between the stages through the venting system. It also considers the effect of variations of the stage flash down and the brine level inside the flashing chambers on the non-equilibrium allowance. The boiling point elevation as a function of the brine pool temperature and salinity, the
Governing equations for total material, salt and air & non-condensable gases balance and energy balance are formalized for one of the middle stages and for the brine heater on transient behavior.
Terminal conditions are determined to identify the first and last heat recovery and heat reject stages.
The governing equations for any stage are based on the splitting of the stage into four compartments, the brine pool, the vapor space, the product tray and the tube bundle. The brine heater is also splitted into two compartments the combined shell and sump and the tube bundle.
The derivation forms of the equations representing the thermal and physical properties of fresh and salt water as functions of temperature and salinity are obtained.
Equations representing the tube bundles overall heat transfer coefficients and the distillate and flashing brine temperature correlations were obtained.
The mathematical model considers the effect of variation of fouling factors with the operating hours, presence of air & non-condensable gases and leakage of vapor and non-condensable gases to the ejector and between the stages through the venting system. It also considers the effect of variations of the stage flash down and the brine level inside the flashing chambers on the non-equilibrium allowance. The boiling point elevation as a function of the brine pool temperature and salinity, the
Other data
| Title | DYNAMIC MODELING OF MSF DESALINATION PLANTS | Other Titles | النمذجة الديناميكية لنظام تحلية المياه المالحة بطريقة البخر الوميضى المتعدد المراحل | Authors | Mahmoud Samy Ahmed Shousha | Issue Date | 2001 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| محمود سامى احمد.pdf | 345.49 kB | Adobe PDF | View/Open |
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