Evaporation - Climbing Film and Natural Circulation Evaporator
A complete teaching system
with comprehensive experiments, data analysis, tutor's and student manuals
if desired, and all instruments and controllers.
- Vacuum or atmospheric
operation
- Batch or continuous operation
- Optional forced circulation
- Custom designed for technician/undergraduate
teaching
- Complete visual monitoring
of the process
- Easily operated and used
- No further development
work necessary
- Suitable for project or
research work
Specification
A QVF evaporation teaching
system module comprising a 3000mm x 25mm diameter long tube evaporator,
cyclone separator, vapor condenser, product and condensate receivers,
all manufactured in borosilicate glass. Designed to operate as either
a climbing film or natural circulation evaporator for atmospheric or
vacuum operation. Supplied with all valves. controllers, instrumentation,
service lines and supporting structure. Complete with an installation
and maintenance manual and tool kit.
Experimental Capabilities
- Mass and heat balances
- Determination of evaporative
heat transfer coefficients
- Influence of vacuum levels
on evaporation rates
- Influence of flowrate
on forced circulation heat transfer coefficients
- Comparison of climbing
film, natural and forced circulation evaporation
Water is used in the experiments.
Climbing film evaporation is particularly suited to the concentration
of heat sensitive materials such as milk, fruit juices, blood plasma,
etc. and for desalination studies.
The experiments are also
designed to provide training in chemical plant control and operation.
Optional Manuals
The equipment can be supplied
with the following manuals:
Tutor's manual: The
basis of a lecture course on evaporation theory and practice. Also including
operating instructions, experiments, typical results and answers to
student questions.
Student manuals provide
the basics of evaporation theory and practice with plant operating instructions.
Experiment booklets provide
step-by-step instructions for performing the experiments, data to be
recorded and questions to be answered.
Additional copies of the
student manuals and experiment booklets can be reordered.
Description
The plant is fitted with
a steam heated long tube calandria evaporator. Feed material from the
feed vessel enters at the calandria base, its flowrate being determined
by means of an in-line variable area flow meter, and is partially evaporated.
Vapor and liquid pass into the cyclone which separates the phases. Vapor
passes to a water cooled condenser, the condensate being collected in
a receiver which allows condensate removal while operating under vacuum.
When operating as a climbing
film evaporator, feed material partially evaporates as the liquid film
is seen to climb the tube. Concentrate from the cyclone is collected
in a graduated receiver as final product or is recirculated back to
the calandria
In natural circulation mode,
the evaporator is run flooded and concentrate continually passes back
to the evaporator, evaporated product being replaced intermittently
from the feed vessel.
The optional equipment consisting
of a pump, variable area flow meter and interconnecting pipework allows
forced circulation evaporation to be studied over a wide range of flowrates.
Plant operation is controlled
from a free-standing control panel fitted with a mimic diagram, flow
controllers, temperature and pressure indicators and services controllers.
All major process items and
pipework are manufactured from QVF borosilicate glass with other contact
parts In PVDF, PTFE and stainless steel.
Options
Either steam or electric
heating.
Electrical System: The
electrical system can be designed to meet your local requirements.
Equipment Specification
- Calandria: 3000mm x 25mm
diameter
- Condenser: 150mm dia x
1.5m2
- Concentrate receive (1):
7 L graduated in 50 ml increments
- Product receivers (2)
5L
Installation and maintenance
manual provides detailed instructions on installing and maintaining
the plant.
Instrumentation
- Water: Control valve,
pressure gauge
- Vacuum: Control valve,
pressure gauge
- Steam: Reducer, control
valve, pressure gauge
- Process: Two temperature
indicators
Utilities Requirements
- Steam: 45 lb/hr at 2.1
bar g
- Water: 1250 L/hr at 1
bar g
- Vacuum: 100 torr
Space Requirements
(height x floor area)
5.2 x 2.0 1.0 meters
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