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ASME PTC 4.2 Document Information:
Title
Coal Pulverizers
ASME International
Publication Date:
Jan 1, 1969
Scope:
OBJECT AND SCOPE
This Code appIies to the pulverizing system as a whole, including all
the component parts necessary
to take the raw coal, hot air and tempering air at the system inlet,
and deliver pulverized coal in
proper mixture with air and/or flue gas at the desired temperature at
the outlet of the system.
This Code applies to the most commonly used systems.
The direct-fired system in which pulverizers deliver the coal directly
to the burner. This system
usually comprises the following equipment:
Pulverizer and classifier
Feeder
Exhauster or pulverizer fan
Air inlet and tempering air connection, including control damper
Discharge coal and air piping, including valves
Motors and/or steam drives
Sources of hot air or flue gas
Figures 1 and 2 iIlustrate the arrangement of these components in
pressure and suction systems for
direct firing.
The storage system in which the coal is pulverized and stored in bins
from which it is fed to the
burners as needed. This system usually comprises the following
equipment:
Pulverizer and classifier
Feeders, raw coal and pulverized coal
Exhauster or pulverizer fan
Pulverizer and hot flue gas fan
Coal and air piping including hot air inlet damper, cold air damper,
and vent damper
Motors and/or steam drives
Source of hot air or flue gas
Vent cleaning equipment, which may be vent cyclone, concentrators or
filters
Cyclone, cyclone air lock
Vent fan
Figure 3 illustrates the arrangement of these components for a typical
storage system.
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