MVR
Falling
Film
Vacuum
Evaporator
For
Waste
Water
Treatment
Engineer-to-order
MVR
(Mechanical
Vapor
Recompression)
falling-film
vacuum
evaporator
for
industrial
wastewater
treatment.
Thin-film
boiling
under
vacuum
protects
heat-sensitive
streams,
while
recompressed
vapor
duty
recycles
latent
heat
to
deliver
low
OPEX,
deep
concentration,
and
stable
24/7
operation--ready
for
integration
with
crystallization
and
ZLD
solids
handling.
Key
Benefits
-
Energy
saving:
Electric-driven
MVR
minimizes
fresh
steam
after
start-up.
-
High
recovery:
Concentrates
high-TDS/COD
brines;
enables
chemical
desalination
and
salt
recovery.
-
Product
protection:
Low
ΔT
falling
film
limits
thermal
degradation
and
foaming.
-
Scaling
control:
Optimized
ΔT/LMTD,
uniform
film
distributors,
antiscalant
dosing,
and
CIP-ready
design.
-
Fully
automatic:
PLC/HMI
recipes,
alarms,
historian,
and
remote
diagnostics
for
24/7
uptime.
Process
&
Thermal
Economy
Secondary
vapor
is
mechanically
compressed
to
raise
saturation
temperature
and
reused
as
the
heating
medium.
Even
film
distribution
over
vertical
exchangers
maintains
high
heat-transfer
coefficients;
controlled
residence
time,
pressure,
and
ΔT
setpoints
deliver
predictable
concentration
with
low
specific
energy.
Materials
&
Cleanability
Wetted
parts
in
SS316L/duplex
(Ti/Hastelloy
optional).
Drainable
layouts,
large
access
for
inspection,
validated
CIP,
and
elastomer
selections
suited
to
chlorides,
solvents,
acids/alkalis.
Process
Overview
--
Wastewater
to
ZLD
-
Feed
conditioning:
screening/filtration,
softening
or
pH
trim;
antiscalant
for
Ca/Mg/Si
control.
-
MVR
falling
film
(vacuum):
VFD
compressor
sets
ΔT;
shell
vacuum
defines
boiling
point.
-
Condensate
polishing:
filters/RO/AC
to
reuse
or
discharge
spec
(conductivity/TOC
guard).
-
Crystallization
&
solids:
DTB/OSLO
or
FC
crystallizer
->
centrifuge/dryer
->
compliant
solids
discharge.
-
Automation:
start/stop
recipes,
load
following
via
VFD,
scheduled
CIP
windows.
Key
Components
-
Falling-film
evaporator
body
with
film
distributors
and
vapor-liquid
separator
-
MVR
mechanical
vapor
compressor
(turbo/Roots)
with
VFD
for
ΔT/capacity
control
-
Surface
condenser,
vacuum/NCG
handling,
preheaters/heat-recovery
HX
-
PLC/HMI/SCADA;
instrumentation
(T/P/flow/cond/level)
with
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)
|
|
Shell
pressure
|
~6-25
kPa(abs),
duty-dependent
|
|
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
exchanger
design.
FAQ
Can
it
integrate
with
our
existing
membranes
for
ZLD?
Yes--RO/NF
pre-concentration
upstream
with
MVR
+
crystallizer
downstream
is
a
proven
ZLD
configuration.
How
do
you
manage
scaling
on
difficult
brines?
Pretreatment,
optimized
film
ΔT/velocity,
antiscalant
dosing,
and
scheduled
CIP
based
on
online
fouling
indicators.
What
condensate
quality
is
achievable?
Low
conductivity/TOC
suitable
for
reuse
after
polishing;
quality
guards
ensure
compliance
with
site
limits.
Application
