Evaporation - Double Effect Evaporator
A complete teaching system
with comprehensive experiments, data analysis, tutor's and student manuals
if desired, and all instruments and controllers.
- Single or double effect
operation
- Forward or parallel feed
- 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 two steam-heated 20 liter evaporators, feed
vessel, condenser, product and distillate receivers and connecting pipework,
all manufactured from borosilicate glass. Designed to operate under
reduced pressure with forward or parallel feed in single and double
effect 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 steam
efficiency
- The effect of steam pressure
and vacuum level on throughput and efficiency
- Comparison of single and
double effect evaporation
Water is used in all experiments.
Other liquid mixtures can also be investigated and the unit is ideal
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 double effect evaporator
is fitted with two steam heated evaporators. Vapor generated by the
first effect passes to the boiler of the second where it condenses and
then collects in the first effect distillate receiver. Vapor from the
second effect condenses in the condenser and is collected in the second
effect distillate receiver. When operating as a single effect evaporator,
steam is introduced into the second effect boiler
Feed from the feed vessel
can enter either effect, its flowrate being determined by means of an
in-line variable area flow meter.
In continuous feed forward
operation, the feed enters the first effect, the liquid level being
manually controlled by intermittently opening the connecting valve between
the two effects. In a similar manner, the second effect is allowed to
overflow into the product receiver.
In parallel feed operation,
feed enters both effects and levels are controlled in the same manner
as feed forward operation.
Temperature and pressure
gauges fitted at strategic locations enable the operation of the evaporators
to be monitored and studied.
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 Specification:
The electrical system can be designed to meet your local requirements
Equipment Specification
- Feed vessel: 30 L
- Evaporators (2): 150mm
x 0.5ft.2
- Condenser (1): 225mm x
2.5ft.2
- Distillate receivers (2):
5L
- Product receiver: 5L
- Safety: Graphite rupture
discs (2)
Installation and maintenance
manual provides detailed instructions on installing and maintaining
the plant.
Instrumentation
- Water: Control valve,
pressure gauge
- Vacuum: Control valve
- Steam: Reducer, control
valve, pressure gauge
- Process: Variable area
flowmeter, two temperature and pressure gauges
Utilities Requirements
- Steam: 35 lb/hr at 3 bar
g
- Water: 2000 L/hr at 1
bar g
- Vacuum: 100 torr
Space Requirements
(height x floor area)
3.3 x 3.0 x 1.0 meters
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