Working Principle - Danfoss IPS 8 Technical Data, Installation And Use

User Guide | Intelligent Purger System (IPS 8) for Ammonia - Technical data, installation and use

Working principle

© Danfoss | DCS (ms) | 2019.06
The Danfoss IPS 8 is factory-tested and ready for
use in ammonia plants with a condenser pressure
of more than 6 bar (87 psi). The purger is charged
with 900 gram (31.7 oz) of R452A.
Only 2 mechanical connections are needed for
the purger (see fig. 1). The exchange of ammonia/
NC gases with the main plant is done through
the flange for ammonia access (see 13 in figure
below), while the NC gas purge is done through
the blow-off pipe after the purge restrictor (18).
Through the flange for ammonia access (13), a
mixture of ammonia gas and NC gases enters the
evaporator (12) of the purger.
This ammonia/NC mix is cooled down below
the condensing temperature of the ammonia
by the R452A circuit. At this point, ammonia gas
condenses and returns to the ammonia plant via
gravity, whereas the NC gases accumulates in the
evaporator (12) for subsequent purging.
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Fig. 1 - Purger R452A lay-out
1 Compressor R452A
1 Compressor Cranck case heater
2 Thermostat for crankcase heater control
3 Compressor Hi-temp sensor
4 Pressure safety switch
5 Condenser coil assy
5 Fan motor for conderser
6 Extration Fan
6 Air grid with filter (2 pieces)
7 Pressure switch for Fan
8 Reciever
9 Filter
10 Sigth glass
By condensing the ammonia gas, a new
ammonia/NC gases mix is naturally pulled
through. This new mix is separated through a
continuous process.
While the NC gas concentration in the evaporator
(12) increases, the R452A evaporator pressure
and temperature will continuously lower.
The controller monitors R452A evaporator
pressure and ammonia pressure and temperature
and when R452A pressure reaches a predefined
pressure differential to the ammonia pressure/
temperature, it prepares to purge the NC gases
through the solenoid valve (16). The blow-off
is activated by the solenoid (16) and through
appropriate piping/hosing, it is led into a water
bath. This process is done to retain small amounts
of ammonia (see Installation section).
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12
11 Expansion valve, R452A
12 Evaporator, R452A
13 Welding Flange
13 Flange blind blank
14 Pressure transmitter evaporator
15 Pressure transmitter - R717
16 Solenoid coil, 24V
16 Purger solenoid kit
17 Temperature sensor - R717
18 Restrictor, purge line
19 MCX 15 Pre-programmed
20 PSU, 24V
900 gram (31.7 oz) R452A
19 20
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BC306932151284en-000101 | 5
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