In made up of 8″ M.S. flanged tube

In
this experiment some components have been used as described below.

Figure
6-2 Pictorial Schematic Presentation Of The Experimental Test Rig

The Experimental test rig is designed to
determining adsorbent characteristics based on the volumetric method. As an
alternative of studying the model performance, a real scaled down adsorbent bed
module is Prepared. Figure 6-1 and 6-2 are the schematic diagram and pictorial Schematic
presentation of the experimental test rig. The main part of the experimental
test facility is the adsorbent bed reactor. It is made up of 8″ M.S. flanged
tube which is integral with two scaled down adsorbent-bed modules, Figure 6-3.
These adsorbent bed modules are rectangular finned tube heat exchanger and
silica gel granules used to fill the inter fin gaps. These modules have been
covered by stainless steel mesh to prevent granules falling down. These modules
are set in two passes and fixed in the front plate by means of 16mm to 12mm
compression fittings, Figure 6-4.

Figure 6-3 M.S. Flanged
Tube Adsorbent bed

The
inlet and outlet headers are made to distribute water flow and collect respectively,
Figure 6-5. Inlet and outlet points were preferred to keep uniform circulation
through the tubes of adsorbent bed modules. Numbers of available holes were
applied in the rear plate to facilitate temperature and pressure measurements
by means of thermocouples and vacuum gauge.

 

Figure 6-4 Finned Tube
Heat Exchanger Inserted in Adsorbent bed with Compression Fittings

Figure 6-5 Finned Tube
Heat Exchanger Inserted in Adsorbent bed with Compression Fittings

The refrigerant tank is a conical glass
flask that is selected to withstand full vacuum operation, Figure 6.6. The
refrigerant flask is used for measuring the change in refrigerant amount during
the adsorption process; therefore it was calibrated before use by means of a calibrating tank. Water vapour is a
condensable gas and the tube connections between the refrigerant flask and
adsorbent bed reactor is heated by hot air stream to maintain the connection
line temperature 10 degrees above the generated vapour temperature in the tank
and hence prevent condensation to occur. The refrigerant flask temperature
increased up to 40?C using a preset heating plate.

Figure 6-6 Refrigeration Flask with Glass wool Insulation at
outer wall

Secondary
fluid (Cooling / heating water) is pumped using Crompton® in-line centrifugal
pump of maximum flow rate (240 l/min / 40kPa-NPSH). Secondary fluid flow rate
is controlled by means of flow control valve that is fitted in the flow outlet
line. A bypass line is required to avoid the pump cavitations problem in case
of low flow rates. The flow rate in the bypass line is controlled by means of
bypass control valve. The secondary fluid is initially maintained in
350×450×450 mm (length × width × height) tank and is filled from the main by a
float control valve to avoid overflow.

The
secondary fluid is heated up by means of 2×2kW domestic heaters that can raise
the water temperature up to 75?C, Figure 6-7. Adsorbent bed reactor was
assisted by a drainage line that is used for condensate drainage. This line is
fitted with a shut off valve, to isolate the system during the experiment.

Figure 6-7 Water Immersion Heaters 2KW

The
test rig is kept at full vacuum during the adsorption process, based on the
industrial recommendation. A vacuum pump (PARAG Engineering) is used to
generate the required vacuum level, Figure 6-8. The connection between the
vacuum pump and the reactor is controlled by a shut off valve and assisted by a
separation tank. This tank has the function of capturing the water vapour that
gets out from the reactor during vacuum pump operation. The separation tank is
cooled down by immersing it in ice to capture water vapour by condensation. The
flow rate and temperature signals measurements are logged by
dataTaker-“T85, data logger.

Figure 6-8 Vacuum Pump (PARAG Engineering)

Figure 6-10 Vacuum Gauge & Separation Flask with Ice Box

Instrumentation

The
test rig is assisted by a computerised measuring system by which the
temperatures and flow rates can be monitored and recorded on the computer.
However, the pressure is measured manually. “escriptions of the various
measuring devices are given in this section.

Temperature measurement

Thermocouples
were installed at different points in the test facility to measure the
secondary fluid at inlet and outlet, adsorbent bed module, shell space and
shell surface temperatures. All applied thermocouples are RTD-type of compact
transition joint probes RTD-PT-100, as shown in Figure 6-11. These were made
of stainless steel sheath that resists aqueous environments.

Figure 6-11 RTD_PT_100  Thermocouple

All
thermocouples except the ones that measure inlet, outlet and shell outside
surface temperature are inserted individually using compression fittings. Inlet
and outlet water flow temperatures were measured using thermocouples of 6 and
50 mm sheath diameter and length respectively.