MIL-HDBK-1003/6
Table 4
Maximum Flue Gas Velocities (Feet Per Second) in Convection Sections for
Coal, Wood or Solid Waste Boilers
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*
*
Single Pass
Multi-Pass
*
*
Water Tube
Water
Tube
*
*
Solid
*
*
Coal
Wood
Waste
Coal
*
*
* Pulverized coal
*
50
60
*
*
*
* Underfeed stoker
75
60
*
*
*
* Spreader stoker
60
50 (1)
50
*
* traveling grate
*
*
*
* Spreader stoker
60
50
50
* traveling grate
*
*
*
* Traveling grate
*
75
60
* (front gravity feed)
*
*
*
* Solid waste
*
30
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(1) If wood has sand, use 35 fps.
Plant Layout. The plant layout should be designed to reduce
3.6
maintenance time, and allow for easy operation of equipment.
Future situations to consider include:
a)
Tube cleaning
b)
Tube replacement
c)
Future expansion
d)
Conversion fuels
Tube replacement for firetube boilers typically requires a space in
front of the boiler which is equal to the boiler's longest length. If there
is a possibility of future conversion of firing equipment to another fuel,
provide space for the installation and operation of such equipment and for
local storage and handling of the new fuel. Enough room shall be provided to
accommodate all auxiliaries such as feed pumps, fuel pumps, condensate tank
water heaters, deairators, condensate receivers and other equipment normally
located in the boiler room.
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