MVR Mechanical vapor compression for waste water concentration
Working principle
Compress secondary steam by using steam centrifugal compressor or
other steam compression device to make sure its physical properties
meet with the requirements for heating steam ; evaporation that
uses it as heating steam only requires fresh steam supply when the
machine is started. After entering normal operation, there is no
need to supply new steam and no (or very little) secondary steam
needs condensation. Therefore MVR evaporation substantially cuts
down steam demand but consumes more power.
Characteristics
Energy saving: high thermal efficiency, energy saving, lower energy
consumption, the energy consumption of
1t water evaporation is about 1/5 to 1/3 of conventional
evaporator.
Environmental protection: completely get rid of dependence on steam
boiler, the mechanical vapor recompression evaporator could be
start-up by electricity.Without boiler, don't need to burn coal, a
small amount of steam, a small amount of cooling water.
The operation cost is low: due to low energy consumption, the
operating cost of the whole evaporator is only 1/3 to 1/2 of
traditional evaporator.
Small area: the system has high dense mechanical structure, so the
cover area is less than 50% of traditional evaporator.
Mild evaporation: low temperature evaporation, the heat transfer
temperature difference is low, so the system is not easy to scale.
High degree of automation: high degree of automation, simple
operation, easy to operate.
Mechanical Vapor Recompression (MVR) evaporator
Mechanical vapor Recompression reduces the energy used in the
evaporation process by up to 90% compared with conventional
systems.
It works by reusing the heat energy contained in the vapor.This
energy would otherwise be wasted.In a typical falling film
evaporation plant the feed liquid enters the top of a vertical
chamber called a Calandria.The liquid is dispersed across a large
number of vertical tubes as it flows downwards it tends to form a
film on the inside of the tube.Between the top and the bottom
sections of the Calandria there is a sealed are where the tubes
pass through a jacket of high temperature vapor.This section acts
as a heating exchanger. As the hot vapor condenses on the outside
of the tubes,it releases latent heat which raises the temperature
of the feed liquid in the tubes.By the time the feed liquid leaves
the bottom of the tube,much of the water has been evaporated off
leaving a concentrated viscous liquid.The water which has been
evaporated off leaves the tube as vapor.In the bottom section of
the Calandria,some of the concentrated liquid gathers and can be
drawn off,the hot mixture passes into a cooler chamber called the
Separator where more of the concentrated liquid falls to the bottom
to be drawn off and the vapor rises to the top.This vapor now
contains most of the energy that was initially fed into the system.
The turbo fan sucks the vapor from the Separator and re-compresses
it,raising the pressure and so increasing the temperature to the
point where the vapor can once again be used as a source of
heat.The unit is extremely robust,gas tight turbo fan ideally
suited to the pressure,temperatures and volumes of the MVC
evaporation process.At its heart is an ultra high speed impeller
with a tip velocity of over 1000 Km/h faster than the speed of a
jet airliner.The rotor probably has the highest tip velocity of any
welded impeller ever manufactured.The re-heated vapor can then be
fed back into the Calandria to provide the heat energy required to
evaporate more feed liquid as it passes down the tubes.The
Mechanical Vapor Compression process is a high energy efficient and
cost effective way of retaining and reusing the latent heat
contained in the vapor.Energy that would otherwise be wasted.Once
the process has been started and brought up th temperature the only
energy input required is the electricity to drive the Turbo fan.
As energy costs increase, the use of Mechanical Vapor Recompression
(MVR) evaporators has also increased. The energy savings possible
by using MVR technology is significant. MVR evaporators are
designed to operate with very low specific energy consumption while
producing clean condensate to minimize fresh water consumption in
the mill.
MVR Applications
MVR energy-saving, low-temperature evaporation technology replaces
simple evaporators. MVR is widely used in many applications,
including:
Zero Liquid Discharge for industrial wastewater treatment
Chemical industry for evaporation, crystallization, and
purification
Salt brine concentration
RO brine concentration
Beverage industry (milk, juice, sugar, etc.) concentration
Food industry (MSG, soy, protein, sugar) concentration
Pharmaceutical industry (medicines, vitamins) concentration
Name | MVR evaporator/New product Industrial mvr evaporator |
Material | SUS304L/316L/Titanium alloy |
Vacuum degree | Adjustable |
Rotary flask | Customzied |
Rotating Speed | 0~180rpm |
Main uses | Industrial Distillation,concentration, Crystallization |
Sealing | PTFE |
Condenser | Vertical |
Product Keywords | energy saving MVR evaporator,MVR industrial evaporator |
Working principle drawing
Machining & Assembling Workshop
Tag: energy saving MVR evaporator;MVR industrial evaporator