What is multistage flash desalination?
Multi-stage flash distillation (MSF) is a water desalination process that distills sea water by flashing a portion of the water into steam in multiple stages of what are essentially countercurrent heat exchangers.
How does multi-stage flash work?
The multi-stage flash distillation is a process where incoming seawater is pumped to a higher pressure and heated to near boiling. Through a series of stages, the seawater pressure is decreased to generate vapor that is condensed by the incoming seawater.
What is desalination of water PPT?
Desalination is when you remove salt from groundwater or seawater to make fresh water for you to drink. When you desalinate you heat the water leaving the salt behind condensing fresh water from the vapour or stream which has been used for thousands of years. The filtered water then enters the reverse osmosis plant.
What are the different types of desalination?
Today there are two main types of desalination technologies – membrane (RO) and thermal (MED, MVC and MSF) desalination. Reverse Osmosis (RO) desalination uses the principle of osmosis to remove salt and other impurities, by transferring water through a series of semi-permeable membranes.
What are the disadvantages of multistage flash distillation?
Disadvantages of a multi-stage flash distillation system are a high operating cost when waste heat is not available for the distillation process and relatively high rates of corrosion and scale formation due to high operating temperatures.
Why is multistage flash more expensive than reverse osmosis?
MSF plants are considerably larger than RO plants with special materials. Consequentially the construction and land costs are high. Since steam is used piping, condensate and other associated systems are involved. All these result in increased maintenance costs.
How does thermal desalination work?
Thermal desalination is a process that involves changing saline water into vapor. This vapor, or steam, is generally free of the salt, minerals, and other contaminants that were in the saline water. When condensed, this vapor forms a high-purity distilled water. A distiller produces distilled water.
What is desalination Slideshare?
Desalination •Desalination is the process of removing dissolved minerals from brackish or seawater to produce freshwater.
What is thermal desalination process?
Thermal desalination is a process that involves changing saline water into vapor. This vapor, or steam, is generally free of the salt, minerals, and other contaminants that were in the saline water. The quality of water produced and the heat consumed in its production can both be defined when the system is designed.
What is the difference between MSF and MED desalination?
In a MED plant, evaporation is from a seawater film in contact with the heat transfer surface, whereas in the MSF plant only convective heating of seawater occurs within the tubes and evaporation is from a flow of brine “flashing” in each stage to produce vapour.
Is there a multi stage flash desalination system?
A novel system is presented for the multi-stage flash desalination. The system is based on the conventional MSF configuration, where it includes two of its basic elements; the brine heater and the heat recovery section.
How many stages are in a flash distillation plant?
Sections on flash-distillation systems are called stages, hence the name multi-stage flash (MSF). A normal MSF plant can comprise 4–40 stages, with each consecutive stage functioning at a lower temperature and pressure than the earlier one.
What are the different types of MSF desalination?
MSF has different design configurations, namely brine recirculation (MSF-BR), once through (MSF-OT) configuration and simple mixer (MSF-M). Conventional water desalination uses low-temperature heat to purify seawater. Three types of desalination are considered: multi-stage flash distillation, multiple effect distillation, and reverse osmosis.
Which is a process in the desalination process?
Desalination processes can be classified as either distillation or membrane processes. Technologies include Multistage Flash (MSF), Multiple Effect (MED), Vapor Compression (VC), Reverse Osmosis (RO), Hybrid System (MSF / MED + RO) thermal evaporation is the principal mechanism in generating fresh water vapor from seawater.