Energy
Saving
MVR
Evaporator
PLC
Engine
Zero
Liquid
Discharge
Wastewater
Engineer-to-order
MVR
(Mechanical
Vapor
Recompression)
evaporator
for
ZLD
wastewater
treatment.
The
system
recycles
latent
heat
via
mechanical
recompression
to
minimize
utilities,
while
a
PLC
control
engine
orchestrates
continuous,
unattended
operation—delivering
low
OPEX,
high
recovery,
and
compliant
discharge
as
solids.
Key
Benefits
-
Energy
saving:
Electric-driven
MVR
slashes
fresh-steam
demand
after
start-up.
-
ZLD-ready:
Deep
concentration
to
crystallizer/centrifuge/dryer
for
zero
liquid
discharge.
-
Smart
automation:
PLC/HMI
with
recipes,
alarms,
historian,
remote
diagnostics,
and
load
following.
-
Stable
operation:
Vacuum
low-ΔT
duty,
optimized
ΔT/LMTD
and
velocity
to
reduce
fouling
and
foaming.
-
Durable
materials:
SS316L/duplex
(Ti/Hastelloy
optional)
for
corrosive
brines
and
chemicals.
Process
&
Thermal
Economy
Secondary
vapor
is
mechanically
compressed
to
elevate
saturation
temperature
and
reused
as
the
heating
medium.
Tight
control
of
pressure,
ΔT,
circulation
rate,
and
residence
time
keeps
coefficients
high
and
specific
energy
low,
producing
condensate
suitable
for
reuse
after
polishing.
PLC
Control
&
Safety
Closed-loop
control
of
level/pressure/temperature/conductivity;
interlocks
for
compressor/VFD,
vacuum
and
NCG
handling,
heater
duty,
and
condensate
quality
guard.
Event/alarm
historian
and
secure
remote
support
enable
24/7
uptime.
Process
Overview
—
ZLD
Wastewater
-
Feed
conditioning:
screening/filtration,
softening
or
pH
trim;
antiscalant
to
limit
Ca/Mg/Si
scale.
-
MVR
evaporation
(vacuum):
falling
film
or
forced
circulation;
compressor
discharge
sets
ΔT/capacity.
-
Condensate
polishing:
filters/RO/AC
to
reuse
or
discharge
spec
(conductivity/TOC
guard).
-
Crystallization
&
solids:
DTB/OSLO
or
FC
crystallizer
→
centrifuge/dryer
→
compliant
solid
disposal
or
recovery.
-
Automation:
PLC
recipes
for
start/stop,
CIP
windows,
and
load-following
with
VFDs.
Key
Components
-
MVR
evaporator
body
(falling
film
/
forced
circulation)
with
vapor-liquid
separator
-
Mechanical
vapor
compressor
(turbo/Roots)
with
VFD
-
Surface
condenser,
vacuum/NCG
skid,
preheaters/heat
recovery
HX
-
PLC/HMI/SCADA;
instrumentation
(T/P/flow/cond/level);
alarm
&
historian
-
CIP
skid;
antiscalant
dosing;
optional
condensate
polishing
filters/RO
Performance
&
Sizing
|
Parameter
|
Typical
Range*
|
|
Operation
|
Continuous,
24/7
(vacuum
duty)
|
|
Electric
use
(MVR)
|
~15-40
kWh
per
ton
of
water
evaporated
|
|
Fresh
steam
demand
|
Very
low
after
start-up
(backup/ancillary
only)
|
|
Turndown
|
50-100%
with
stable
ΔT
and
quality
|
|
Materials
|
SS316L
/
duplex;
Ti/Hastelloy
on
request
|
*Actual
performance
depends
on
feed
salinity/COD,
fouling
tendency,
compression
ratio,
and
heat-exchanger
design.
FAQ
Can
this
integrate
after
membranes
for
ZLD?
Yes.
RO/NF
pre-concentration
upstream
with
MVR
+
crystallizer
downstream
is
a
standard
ZLD
configuration.
How
is
scaling
managed?
Through
pretreatment,
optimized
ΔT/LMTD
and
velocity,
antiscalant
dosing,
and
scheduled
CIP
based
on
fouling
indicators.
What
condensate
quality
is
achievable?
Low
conductivity/TOC;
polishing
enables
reuse
within
the
plant,
reducing
freshwater
intake.
Application
