2.2.8.6
Control for Sootblowing System
Provide sootblowing system with an automatic programmable control system
which will automatically start and stop each sootblower in programmable
sequence and monitor and display operation of sootblowers. Provide an
overriding control which will permit manual start-stop operation of
sootblowers.
2.3
ECONOMIZER
Provide economizer [separate from the boiler] [integral to and within the
boiler setting]. Economizer shall be of the [bare tube] [cast iron fin
covered steel tube] design complete with feedwater piping between
economizer and boiler drum. Economizer shall be constructed in accordance
with the requirements of ASME BPVC SEC I meeting the design and operating
conditions as specified for the boiler and bearing the ASME Code symbol
stamp. Economizer shall be suitable for the operating conditions and the
fuels specified. Materials provided shall withstand temperatures and
pressures prevailing under maximum load conditions. Economizer casing,
insulation, and lagging shall be specified for the boiler.
2.3.1
Accessories
Provide the following accessories and equipment for each economizer.
a.
Sootblowers of the same manufacturer and construction as
sootblowers to be provided for boilers;
b.
Stack temperature control with sensor and motorized feedwater
temperature control valves to function to limit flue gas
temperature to a minimum of [_____] degrees C F by modulating
feedwater to the bypass;
c.
Temperature and pressure indicators on feedwater outlet;
d.
Temperature and pressure indicator on feedwater inlet;
e.
Temperature and pressure indicator on flue gas outlet;
f.
Temperature and pressure indicator on flue gas inlet;
g.
Manual shutoff and bypass piping and valving;
h.
Low point drain pipe complete with two blowoff valves as specified
for the boiler; and
i.
Audible alarm with silencing switch and indicating lights for high
feedwater exit temperature, low feedwater exit temperatures, low
or high flue gas exit temperature, low feedwater entrance
temperature or pressure.
2.4
COAL GRATE STOKERS
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NOTE: Choose from either the paragraphs and
subparagraphs below entitled "Traveling Grate Coal
Stoker" or the paragraphs and subparagraphs entitled
"Traveling Grate Spreader Coal Stoker" that follow
it.
SECTION 15502N
Page 61
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