MIL-HDBK-1003/6
Table 3
Boiler Selection Criteria (continued)
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*
*
Typical
Possible
*
* Boiler
Capacity
Emissions
* Type
*
Fuel
Range
to Control
Characteristics
*
*
*
*
RDF
2,000 -
NOx, toxics,
*
*
No Limit
particulate
*
*
* Pulverized Coal
High energy and maintenance *
50,000 -
NOx, SOx,
*
* Coal
No Limit
toxics,
requirements; economical
*
*
particulate for capacities over
*
*
100,000 lb/hr.
*
*
* Fluidized Coal
*
50,000 -
Toxics,
High capital and
*
* Bed
No limit
particulate and maintenance cost
*
*
*
*
Wood
20,000 -
Toxics,
*
*
No Limit
particulate
*
*
*
*
RDF
20,000 -
Toxics,
*
*
particulate
*
*
* High
*
Electric No limit -
None
Convenient; low capital
* Voltage
*
150,000 lb/hr
cost; small space
*
*
requirements
*
*
*
*
Electric No Limit -
None
*
*
50,000 lb/hr
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3.5
Boiler Design. Boiler design is primarily dependent on the fuel
and type of firing. Both furnace heat release rate and EPRS are factors which
determine distribution of heat within the furnace. Proper values must be
maintained to keep local absorption to a minimum and avoid "hot spots." The
primary criteria for design are based on the following:
a) Furnace heat release rate -- the volumetric heat release rate
is the Btu input rate per cubic foot of furnace volume
b) Effective Projected Radiant Surface (EPRS) -- the portion of
the furnace in square feet which is exposed to radiant heat of the flame,
c)
Grate heat release rate (for stoker boilers)
d)
Flue gas velocities through tube banks
e)
Tube spacing
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