Dense Phase Conveying for Heavy Industries - Mac Process Mac ...

Batch Dense Phase Conveying
Dense Phase Pumps and Spheri Valve

Energy-saving, low maintenance technology. Long life.
Batch Dense Phase Conveying
Dense phase pneumatic conveying systems operate
below the minimum suspension velocity and are
characterized by product moving along the bottom of
the pipe in slugs or a moving bed. Product is conveyed
below its saltation velocity at high differential pressures.
Conveying velocities are significantly less than
dilute phase and material to air ratios of up to 100 to
1 are possible. Lower velocity results in friction and
therefore lower wear. Reduced particle interaction also
results in reduced degradation than with dilute phase
systems.
The Dense Phase family of pneumatic conveyors,
developed and applied worldwide by Clyde Process,
are now available from Mac Process. Dense Phase
systems include different configurations to better suit
the material being transported and to more efficiently
achieve the required results.
Vessels can be manufactured to most international
pressure vessel codes and for a working pressure
of 100 PSIG standard. Specific details are available
on request.
All Dense Phase Pumps use Spheri Valves at inlet
and at discharge when required.
Dense Phase Pumps are supplied fully assembled
and tested to minimize installation and start-up
time.
Vessels are free standing, special foundations are
not required.
Optional isolating valve and adapter.
Common applications for dense phase systems include:
Products with high bulk densities
Abrasive products
Friable products
Blended products
High tonnage systems
Long distance systems
Dense Phase Pump
A simple, effective and highly reliable method of conveying material from a
single collection point to either single or multiple reception hoppers.
Originally developed in the 1970’s for the foundry industry, the Dense Phase
Pump has been advanced to efficiently handle many types of bulk solid materials,
from fine cohesive powders to wet lump coal. Equally suited to transfer either
from storage into process or from process into storage, systems are capable of
operating at temperatures up to 900°F with throughput rates of up to 100 t/hr and
distances of 750 ft. or more. The inherent simplicity of the Spheri Valve, the only
moving part in the Dense Phase Pump, ensures system reliability and low
maintenance operation.
PD Pump
A batch transfer vessel designed to exploit the conveying characteristics of
fluidizeable materials. They system utilizes smaller pipelines than the typical
Dense Phase Pump. Operating at medium conveying pressures, with reduced
air flow and power consumption results in highly efficient conveying. Convey
rates of 100 t/hr and conveying distances of 2,000 ft. or more, making this system
particularly suitable for transfer of dry, fluidizable materials such as fly-ash,
cement, pulverized fuels an other bulk powders.
Standard Fabrication
Dense Phase vessel assemblies supplied complete with Spheri Valve, electropneumatic
controls and air supply piping, strainer, pressure regulation and
control equipment pre-piped and pre-wired fully assembled and tested ready
for installation and connection to isolated air and electric supplies.
Many competitive systems are supplied as a “kit” leaving the customer with
the responsibility of supplying pipe fittings and labor to assemble the system
according to documentation.

TD Pump
Similar to a PD Pump in that the vessel pre-pressurizes before discharge,
but is configured for top discharge. The TD Pump offers better
efficiency over long distances by combining a large vessel with a
relatively small pipeline. The number os system venting cycles is
reduced. Additionally, the top discharge operation provides better
control of vessel discharge rate into the pipeline than is possible with
bottom discharge vessels. System can be “tuned” for best efficiency.
The TD Pump requires no drive motor (as with screw pumps) results
in dramatically lower power consumption. It also has the ability to
run at higher pressures which reduces air consumption by increasing
material to air ratio.
TD Pumps are usually applied for systems longer than 1,500 ft. and as
long as 5,000 ft. They convey fluidizable powders such as fly ash and
cement.
CD Pump
A full pipe system designed to convey friable materials with minimum
degradation. Material transport velocities are very low, with extremely
high line loadings. A Spheri Valve is used at the vessel discharge
to isolate the vessel as soon as it is empty, so that it can be refilled
and add further material to the convey line. By constantly recharging
the line, the typical purge (when most degradation is caused) at the
end of a batch dense phase cycle is avoided.
For higher tonnage systems twin CD Pumps can be arranged to fill/
discharge alternately into a single pipeline.
CD Pumps have conveyed agglomerate soap powders, catalysts and a
variety of foods all with very low breakage and waste.
SD Pump - Dry Sand Transfer
Sets new standards for dry sand conveying systems. This unit can be
positioned directly below a silo or feed hopper for automatic filling and
transfer to reception points prior to process use.
The SD Pump is delivered as a complete “off the shelf” package and can
be installed by semi-skilled labor in a matter of hours, there is no need for
skilled commissioning technicians. Five models give transfer rates of up
to approximately 35 tons per hour and thereby meet every dry sand transfer
application within the modern foundry.
D Pump
In order to combat the challenges faced when conveying materials with
broad and variable size analysis, that are difficult top convey in pure dense
phase mode the D Pump concept was developed.
In this case, the conveying pressure is constantly monitored. The discharge
Spheri Valve is used to control the material discharge from the vessel so
that the conveying pressure is maintained in a range.
Blowers or medium pressure compressors provide the convey air which
flows constantly when the D-Pump is operating.
D Pumps can also be applied for the conveying of fluidizable materials.
Twin D Pumps can replace screw pumps while using the existing convey air
supply and conveying pipeline. This provides an instant reduction in power
consumption since the screw pump drive is no longer required. There is
also a maintenance saving since there is no screw to replace.

Spheri Valve
Comprised of a dome shaped closure mounted on half shafts that
is moved through 90 degrees by means of a pneumatic actuator. A
rubber seal mounted at the entry to the valve is inflated by compressed
air when the valve is in the closed position in order to obtain
a gas tight closure. When the valve is opened, the seal is first deflated,
causing it to retract away from the dome; the dome then moves
to the open position. In this way there is no direct contact between
the dome and seal while the dome is moving, hence the associated
abrasive wear of the seal is avoided.
Top Adaptor
(optional)
Top Plate
Insert Ring
Capable of cutting through
moving or static materials
and sealing, the Spheri Valve
handles abrasive, cohesive,
fine and dry products
with equal ease.
Vane Actuator
Limit Switch
Inflatable Seal
Seal
Retaining Ring
Gasket
Pneumatic
Cylinder
Actuator
Cylinder Guard
Valve Body
Vane Actuator Option
1. Top Plate
2. Insert Ring
3. Inflated Seal
Limit Switch
Torque Arm
Cylinder Guard
Cylinder Actuator Option
4. Dome
5. Deflated Seal
6. Seal Retaining Ring
Bottom Adaptor
(optional)
* Seal protection ring
for abrasive products.
* Choice of five Pneumatic seals ,
depending on application.
* Choice of materials and
surface finishes.
* High pressure up to
35 bar (500 psi).
* ‘Valve open’ proximity
switch available.
* Stainless steel
‘food quality’.
.
Choice of ‘vane’ or ‘cylinder’
actuator for different applications.
Only a single moving part
within main valve body . .