Instructional Manual For Clarification Of Startup In Source Categories Affected By New Source Performance Standards - U.s. Environmental Protection Agency - 1979 Page 137
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146 and countercurrently through dispersed falling grain.
The third and usually
final step is to size the grain
~sing
a stack of vibrating screens.
These
three grain cleaning steps can be operated separately or together as one con-
tiguous system.
Grain cleaning may occur before and/or after grain storage.
To prevent spoilage, certain grains, including barley, oats, wheat, corn
and sorghum, must be dried to a specified moisture content before they can be
stored for any length of time.
Drying facilities are used predominately during
the harvest season.
An
alternative to drying is grain blending, a practice of
mixing incoming grain which does not have an excessively high moisture content
with previously dried grain.
Because grain fermentation and heat build up. may occur in long-term storage
,
"
"
bins,
it
becomes necessary to
turn
the grain. to prevent deterioration.
Grain
turning involves transferring material from the bottom of one bin to the top of
another bin.
Turning may be required several times a year depending on moisture
content, grain temperature, and the length of time the grain has been stored
without aeration.
Prior to grain load out, material will be weighed and cleaned if not done
80
previously.
The grain is then transferred from the weigh station to an a-
waiting carrier vehicle via telescopic piping.
A general process flow diagram
for grain terminal elevators is presented in Figure 26.
Particulate emissions
from affected facilities are typically controlled by mechancial separators and
baghouses.
Pre-Startup Operations
.Because of the various affected unit operations associated with grain ter-
minal and storage elevators, many preliminary shakedown procedures must be
undertaken.
Checkout procedures common to all the affected facilities are:
veri.fication of all electrical circuits and connections, checking clearance of
moving equipment, bumping of motors and pumps, assuring correct rotation of
equipment, calibration of scales and instrumentation, and monitoring of air
pollution control devices.
Equipment checkout procedures unique to unloading, distribution and load-
out facilities are:
free passage through transferring legs (e.g., pneumatiC
belt, or bucket conveyors), co+rect movement and discharge of distributors and
trippers of the headhouse and process control systems.
Equipment employed in
grain cleaning are checked out for clearance, alignment, and free flow of ma-
terial.
For the dryers, equipment alignment and rotation, burners, fuel supply
lines, air leakage, and temperature and air flow controls are checked out be-
fore the equipment is actuated.
Process equipment will be tested individually at first, then as integral
parts of an affected facility.
Dry runs will be conducted to make sure pro-
cess equipment is functioning properly before grain is intorduced into the sys-
tem.
After all equipment has been checked out, trial runs will be made handling
grain.
The equipment is tested under various loads to recheck alignment, rota-
tion, clearance, free passage of conveying lines, the distribution system, belt
B~retching,
and conveyor speeds and to break in air pollution control equipment.
125
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