Instructional Manual For Clarification Of Startup In Source Categories Affected By New Source Performance Standards - U.s. Environmental Protection Agency - 1979 Page 117
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146 Introduction
COAL PREPARATION PLANTS - SUBPART Y
§60.250 - 60.254
The NSPS for this category encompasses any facility of greater than 182
metric tons (200 tons) per day process weight which prepares coal by breaking,
crushing, screening, wet or dry cleaning, or thermal drying.
Affected facili-
ties include thermal dryers, pneumatic coal - cleaning equipment, coal process-
ing and
conveyin~
equipment, -coal storage systems, and coal transfer and load-
ing systems.
Performance standards are promulgated for particulate matter
from these facilities.
Thermal dryer emissions are not to contain greater than
0.070 g/dscm (0.031 gr/dscf) or exhibit 20 percent opacity or greater.
Pneu-
matic coal cleaning equipment emissions are not to exceed 0.040 g/dscm
(0.018 gr/dscf) or exhibit 10 percent opacity or greater.
An
emission limit
of less than 20 percent opacity is promulgated for discharges from any coal
processing and conveying equipment, coal storage systems, and coal transfer
and loading systems.
Sources constructed, reconstructed or modified after
October 24, 1974, are subject to the regulation.
Process Description
Coal preparation
crushing is sometimes
coal from impurities.
plants crush, screen, and dry run-of-mine coal.
Secondary
needed at preparation plants to ensure good separation of
Classifying screens separate coal by size and route it to
\
various coal cleaning unit operations.
TheSe unit operations include drying,
pneumatic coal conveying, and breaking or crushing.
Emission control from these
~rocesses
is usually achieved with baghouses and wet suppression systems.
Pre-Startup Operations
There are a number of operations undertaken prior to startup.
These opera-
tions'are necessary to ensure proper operation of equipment and to. prevent
damage to machinery.
For driers, a check of the bearings is made to determine if overheating
occurs.
If no problems are encountered, the drier is ready for on-line opera-
tion.
Other equipment is checked to determine if it is operating properly and
is then ready to be placed on-line.
Startup Operations
Startup is best defined as the day the first shipment of coal is fed through
the crusher.
Conversations with equipment manufacturers and consultants indicate
that once the equipment is installed and checked process operations can be
initiated immediately.
Typical times for installation of equipment to attain-
ment of full operational level are as follows:
105
,
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