and other miscellaneous equipment from the stoker manufacturer required or
necessary for interconnecting of the stoker units and drives necessary for
a complete operating system. Provide equipment even though it is not
specifically mentioned herein. Gears, chains, belts, couplings, and other
moving parts shall be properly enclosed or guarded.
2.4.1.6
Lubrication
The entire stoker mechanism shall have adequate provisions for proper
lubrication where required and shall be equipped with conveniently located
fittings for this purpose.
2.4.1.7
Overfire Air System
Provide an overfire air system from the stoker manufacturer to ensure good
ignition at the stoker front and adequate control of smoking. System shall
include necessary nozzles, ducts, and overfire air fan with motor drive.
When more than one row of nozzles is supplied, provide individual air
volume control for each row or set as required. Locate nozzles or protect
them with shields so as to prevent plugging of the nozzles in service.
Nozzles shall be constructed of materials suitable for service at maximum
temperatures anticipated. Provide necessary arrangements to the water wall
tubes, arch construction, refractory, insulation, and casing from the
boiler manufacturer, to permit installation of an adequate overfire air
system. Overfire system shall be capable of providing a minimum of 15
percent of total combustion air at the required static pressure.
][2.4.2
Traveling Grate Spreader Coal Stoker
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NOTE: Choose this paragraph and its subparagraphs
or the paragraphs and subparagraphs above, entitled
"Traveling Grate Coal Stoker."
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NOTE: When the boiler is not part of this project
insert Coal Analysis at end of this paragraph.
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Stoker shall be of the overfeed, synchronized, self-feeding, spreader
stoker type with continuous cleaning forward moving bar and key grates
suitable for burning a portion of the coal in suspension and burning the
balance on the grates. Stoker shall be capable of continuous operation at
such rate as required for the continuous output of not less than that
specified for the boiler, and shall satisfactorily provide for automatic
operation by means of the combustion control system, within the range given
when burning the specified coal and operated in accordance with
instructions supplied by the manufacturer. Stoker shall be considered an
integral part of the steam generator and shall be subject to all applicable
provisions of the boiler design and service conditions together with
requirements of tests, performance guarantees and other warranties
specified for the boiler. Coal analysis shall be [as specified in the Coal
Analysis Schedule for the boiler] [as listed below].
2.4.2.1
Stoker Grate Heat Release
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NOTE: Normally the stoker grate heat release will be
SECTION 15502N
Page 65
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