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12 Cards in this Set
- Front
- Back
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In addition to reducing heat transfer, soot and ash on fireside tubes also a) lessens the chance of furnace explosions b) increases draft fan power c) results in the formation of CO in the flue gases d) raises superheater temperatures e) results in smoke emissions from the stack |
b) increases draft fan power |
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Relative to Figure 1, in the module the radiant zone is a) downstream of the economizer b) downstream of the air preheater c) between the primary superheater and economizer d) between the reheater and primary superheater e) upstream of the reheater |
e) upstream of the reheater |
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The steam used for sootblowing is usually a) greater than boiler drum pressure b) wet unsaturated steam c) the same as boiler drum pressure d) superheated at the sootblower nozzle e) mixed with compressed air |
d) superheated at the sootblower nozzle |
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A furnace wall sootblower sequence of operation is a) rotate & blow, extend, retract b) extend, blow, retract, rotate c) rotate, extend, blow, retract d) extend, rotate & blow, retract e) retract, blow, rotate, extend |
d) extend, rotate & blow, retract |
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A long retractable sootblower will a) have nozzles throughout its full length b) be used to clean furnace walls c) blow during extension and retraction as it rotates d) not blow until fully extended e) require less exterior room than a furnace wall unit |
c) blow during extension and retraction as it rotates |
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During a sootblowing operation the boiler firing rate should be at least a) 15% b) 30% c) 20% d) 80% e) 70% |
b) 30% |
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While a steam sootblower is in operation it is cooled by a) air b) flue gases c) steam d) water e) none of the above |
c) steam |
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A stationary sootblower a) has two opposing nozzles at the end of its lance b) has a row of nozzles throughout the lance length c) does not rotate while blowing d) is cooled by air while not in use e) is cooled by water while not in use |
b) has a row of nozzles throughout the lance length |
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Shot cleaning pellets have a diameter of approximately a) 2 cm b) 6 cm c) 0.6 cm d) 0.6 mm e) 2 mm |
c) 0.6 cm |
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Shot cleaning pellets are transported to the top of the boiler a) by using an air stream b) manually c) in a steam injection system d) by a hydraulic hoisting system e) and are not recycled |
a) by using an air stream |
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Soot and ash are undesirable on tube surfaces because they a) increase heat transfer through the heating surfaces b) cause overheating of the tubes c) reduce boiler efficiency d) reduce draft for power requirements e) reduce the heating surface of the boiler |
c) reduce boiler efficiency |
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