Biomedical Engineering Reference
In-Depth Information
Saline
feed
Brine Feed
Vacuum
Vacuum
Vacuum
Vapor
Steam in
Vapor
Condensate
back to boiler
Brine
discharge
Brine
discharge
Brine
discharge
Fresh
water
Condensate
FIGURE 19.3
A.block.diagram.schematic.showing.the.basic.elements.of.a.multeffect.distillation.(MED).process..(Based.on.
ref..12;.Trieb,.F.,. Concentrating Solar Power for Water Desalination ,.ed..G.A.C..(DLR).and.I.o.T..Thermodynamics,.
Federal.Ministry.for.the.Environment,.Nature.Conservation.and.Nuclear.Energy,.Stuttgart,.Germany,.2007.)
19.2.3.3   Vapor Compression (VC) Processes
By.themselves,.vapor.compression.processes.(both.thermal.and.mechanical).offer.sim-
ple,.consistent.operation.and.are.usually.used.for.small-.to.medium-scale.desalination.
units..They.are.often.utilized.for.applications.such.as.resorts,.industries,.or.drilling.sites.
with.a.lack.of.direct.access.to.freshwater.supply. 12 .Figure 19.4.shows.a.schematic.repre-
sentation.of.the.unit.processes.involved.in.vapor.compression.cycles.for.water.desalina-
tion..Mechanical.vapor.compression.(MVC).units.are.generally.single-stage.plants.with.
a.production.capacity.up.to.3,000.m 3 /day..MVC.systems.typically.operate.as.single-stage.
units,.as.only.the.capacity,.and.not.the.eficiency,.is.increased.with.additional.stages. 14 .
Preheated SW
ermocompressor
Motive steam
Compressed steam
Preheater
Make-up
Sucked steam
Drain
Fresh
water
Steam
Compressed
steam
Vacuum
1
2
N
Seawater
Brine
discharge
(heat recovery)
Saline
feed
Blowdown
Distillate
Vapor
(A)
(B)
FIGURE 19.4
Schematic. representations. of. basic. unit. processes. involved. in. vapor. compression. cycles. for. water. desalina-
tion.with.(A).the.thermal.vapor.compression.system.and.(B).a.single-stage.mechanical.vapor.compression.sys-
tem.. (Based. on. ref.. 12;. Trieb,. F.,. Concentrating Solar Power for Water Desalination ,. ed.. G.A.C.. (DLR). and. I.o.T..
Thermodynamics,.Federal.Ministry.for.the.Environment,.Nature.Conservation.and.Nuclear.Energy,.Stuttgart,.
Germany,.2007.)
 
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