Vapor compression desalination plant

Eig. 7. Schematic flow diagram of a basic horizontal-tube vapor compression (VC) desalination plant, shown (a) with a mechanical, motor-driven compressor and (b) with a thermocompressor, using an ejector, where (------) represents vapor (—), brine and (-), product. 

The compressor can be driven by electric motors, gas or steam turbiaes, or internal combustion (usually diesel) engines. The compressor can also be a steam-driven ejector (Fig. 7b), which improves plant reUabiUty because of its simplicity and absence of moving parts, but also reduces its efficiency because an ejector is less efficient than a mechanical compressor. In all of the therm ally driven devices, turbiaes, engines, and the ejector mentioned hereia, the exhaust heat can be used for process efficiency improvement, or for desalination by an additional distillation plant. Figure 8 shows a flow diagram of the vertical-tube vapor compression process. 

Fig. 9. Schematic flow diagram of a multi-effect vapor-compression submerged-tube desalination plant with three effects, where (-) represents vapor ...

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Consider the possibility of combining tbe vapor-compression evaporation principle for desalination with the multiple-effect evaporation principle for a two-effect system. Draw a schematic of such a plant and identify the possible advantages of such a combination with respect to Figures 10.2.3 and 10.2.1 (for a two-effect system). 

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