Pneumatic Conveying System - Dilute Phase Conveyors - Pneumatic Conveyor - Design - Equipment Installation
Flow Drawing for a Flour System
BULK FLOUR UNLOAD AND STORAGE
A standard Flour System might consist of (1) 1,625 cu. ft. usable
capacity storage silo capable of holding up to 65,000 lbs. of flour
based on a 40 lbs. per cu. ft. bulk density. The flour will be unloaded
using a self-unloading flour transport truck which is connected to the
silo fill line via a flexible hose. The silo is complete with a
pulse-jet dust collector, high and low level indicator and bin
discharger. The blower will provide air for the
convey system. A rotary valve will feed the flour at a controlled rate
to an inline sifter. The inline sifter will feed the sifted flour into the convey line.
SILO RECLAIM AND SCALE SYSTEM
Will consist of a positive displacement blower designed to convey sifted
flour at a rate of 150 lbs. per minute from the flour silo to a 600 lb.
capacity flour scale. The scale is complete with (3) load cells,
vibrator, discharge butterfly valve and a Bottom Diverter Valve. When
the scale has reached its target weight, the Bottom Diverter Valve will
divert all flour remaining in the convey line back to the originating
silo.
ELECTRICAL CONTROLS
The operations of the system will be managed by an integrated control
system. The control system features a programmable logic controller
(PLC). The input and output modules are mounted in a 48"x36"x8" free-standing NEMA
12-rated enclosure along with motor controls, wiring termination, status
lights, and emergency shut-off controls. A program runs on the PLC to
sequence the flow of material from the storage silo to the scales and to
handle any exceptions that may happen in the normal conveying process.
For a single scale system, a second NEMA 4 panel which is
located at the scaling station. Mounted in this panel is the electrical
componentry needed to collect a weight signal from the load cell and
provide an operator with meaningful information about the weighing and
conveying process. The operator’s primary interface with the system is
provided by a terminal. The terminal uses graphics and simple animation
capabilities to provide the user with information on the status of the
material handling system, recipes and formulas, inventory management,
and batch production. Additional emergency controls and system status
indicators are also installed on the front of the panel. The scale panel
is connected to the main control panel through the proven Remote I/O communications
network. If an additional scale is part of the configuration, a third NEMA 4 panel provides emergency control and status lights without the
terminal, supporting the need
for basic scale and system controls at the second scaling location. All
panels provided are UL-approved and tested by control engineers
for conformance to system performance requirements. The panels arrive
on-site ready to be installed with detailed instructions on how external
electrical circuits are to be terminated.
Along with the electrical systems described above, a
complete set of drawings is supplied that describe the power, control, and physical
characteristics of the main control and scale panels. In addition, a written sequence of operations document that is useful for
training employees on the operation of the system.
SPEC has provided and installed complete turnkey
flour and sugar systems incorporating components from companies like Mac Equipment, Reimelt
Corporation, Smoot, Schenck AccuRate, (NBE) National Bulk Equipment,
Carman Industries, K-Tron, Great Western, and Shick Tube-Veyor.
Please call us for your pneumatic conveying application.