d.
Temperature indicator on feedwater inlet
e.
Temperature indicator on flue gas outlet
f.
Temperature indicator on flue gas inlet
g.
Temperature alarm switches for high and low flue gas temperatures
h.
Alarm with trouble light and silencing switch
i.
Panel with annuciator and temperature indicators for feedwater
inlet, feedwater outlet, flue gas inlet, flue gas outlet of each
economizer
j.
A drain valve downstream of the economizer before the shutoff valve
k.
A stack flue gas temperature control system to control and limit
flue gas temperature to not less than 149 degrees C 300 degrees F
by molulating a motorized feedwater control valve in a bypass
around the economizer. Provide a shutoff valve on each side of
the control valve with a strainer upstream of each valve. Provide
this system parallel to the manual shutoff and bypass described
above
l.
Differential pressure indicator on water side
m.
Differential pressure indicator on gas side
n.
Pressure gages on feedwater inlet and outlet
2.3.3
Insulation
Submit manufacturer's literature of each insulation type and installation,
adhesives, coating mastic and accessories. Make reference to specification
paragraph numbers where they apply.Insulate economizer with not less than
the equivalent of 50 mm 2 inches of mineral wool insulation and lag with
not less than 27 gage galvanized, weatherproof lagging.
2.4
COAL STOKERS
**************************************************************************
NOTE: The single retort underfeed stoker can be
used for up to a maximum continuous rating of
approximately 3 kilogram per second (kg/s) 25,000
pounds per hour steam flowrate and a two hour peak
rating of 3.75 kg/s 30,000 pounds per hour depending
upon the manufacturer.
**************************************************************************
**************************************************************************
NOTE: If the boiler is not part of this project
insert Coal Analysis at end of this paragraph and
delete the last sentence.
**************************************************************************
Provide for each boiler a single retort underfeed stoker with moving grates
arranged for side dump ash discharge. Stoker shall be capable of
continuous operation at such rate as required for continuous output of not
SECTION 15501N
Page 48
Previous Page
