What is the function of boiler system in refinery? Generation of steam for various process operations or applications and for heating applications What’re Streams inlets the boiler? BFW, Fuel, Combustion Air What’re Streams outlets the boiler? Steam, FlueWaste gas Waste Wa ste heat boiler is used? !ncrease the steam temperature of super"heater #ressure safety valve in boiler is used to?
$eliev $elievee pressu pressure re and preven preventt possib possible le e%plos e%plosion ion of a boiler boiler,, preven prevents ts boiler boiler Answer pressure from rising above the setting of the valve by relieving e%cessive steam pressure, guarding against ha&ards of over pressure Q.6
#S' in boiler system?
Answer
!ncluding various #S's in boiler system to protect the system over the pressure ( something something like this )
Q.7
*he safety valve at super"heater as compared to steam drum safety valve setting is set at higherlo+er same value?
o+er Superheating of steam is done at !ncreasing -ecreasingConstant pressure? Constant pressure *he heat used to increase the temperature of saturated steam to superheated steam through super"heater of boiler from? Waste Wa ste heat from flue gases *he basic purpose of super"heater is to increase the temperature of saturated steam to superheated steam to. !ncrease the thermal efficiency of http.en/+i0ipedia/org+i0iSuperheater )) http.en/+i0ipedia/org+i0iSuperheater
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*he basic purpose of steam drum in boiler is to Separate 1 phases of boiler +ater *he purpose of economi&er in a boiler?
2ses the +aste heat from the flue gas of boiler that +ould other+ise be lost to Answer atmosphere to preheat the boiler feed +ater into the boiler/ *his improves the boiler efficiency and reduces fuel costs/ Q. 13
*he heat used to increase the temperature of boiler feed +ater through economi&er of boiler from.
Answer Q. 14
Waste heat of flue gas *he largest heat loss from boilers are caused by
Answer
-/ -ry flue gas Q. 15
*he purpose of de"aeration of boiler feed +ater is to
Answer
A/ $emove dissolved gases Q. 16
What is a benefit of boiler blo+ do+n control?
Answer
-/ All of the above Q. 17 Answer Q. 18
Continuous blo+ do+n (CB-) flo+ is drained from Steam drum !ntermittent blo+ do+n (!B-) flo+ is drained from 32- drum
Q. 19
*he purpose of !ntermittent blo+ do+n (!B-) is $emove solid participates that condense and lay on the bottom of a boiler
Q. 20 Answer Q. 21
*he purpose of Continuous blo+ do+n (CB-) is !s to prevent the saturation of boiler +ater +ith dissolved solids *he important functions of steam traps are
" Answer " " Q. 22
-ischarge of condensate as soon as it is formed 4egligible steam consumption -ischarging of air and other non"condensable gases
*he minimum type of chemicals re5uired to in6ect to boiler system.
" " " Q. 23
Chemicals for controlling the p7 of BFW (amin) Chemicals for controlling the p7 of BF and prevent the fouling (trisodium photphate) 8%ygen scavengers (hydra&in)
When operator increases the load of boiler, should !ncrease combustion air first, increase fuel later
Q. 24
When operator decreases the load of boiler, should -ecrease fuel first, decrease combustion air later
Feed drum, -eaerator drum, steam drum at level #ump trip Boiler pressure too high
*he pressure safety vale (#S') +ill open (pop up) if #ressure on the system over the set value *he probable cause of an increase temperature in the flue gas at the boiler outlet is Fouling heat transfer surface poor fuel ( Maybe correct anwser is ALL OF THESE)
Q. 29
When steam consumption from users increases . #ressure of steam net+or0 is lo+ Fuel consumption increases
Q. 30
Which of the follo+ing statement is correct?
Q. 31
!n normal operation, operating the boiler al+ays . Amount of air is e%cess
Q. 32
When one boiler feed +ater (BFW) pump +as tripped. Standby pump +ill start
Q. 33
When one boiler feed +ater (BFW) pump +as tripped. Standby pump +ill start
Q. 34
*he purpose of main steam chec0 valve on the steam line is to *o prevent reversal flo+
Q. 35
*hermal efficiency of boiler +as effected by Fuel 5uality +ater 5uality
Q. 36
*he 5uality of boiler feed +ater (BFW) is control by p7 Conductivity Silica content 8%ygen content
Q. 37
Which of the follo+ing statement is correct?
Q. 38
What’s the root causes that ma0e blac0 smo0e during normal operation the boiler? 9%cess air is lo+er Slide damper of fore draft fan Status of fuel control valve :uality of fuel Automa&ing steamplant air Boiler pressure controller pressure master controller/
Q. 39
#ossible causes lead to can’t start up the pilot gas of boiler are? #ressure of fuel to burners Flame detector of pilot Burners start up buttons status at local control panel 5uality of fuel Automa&ing steamplant air
Q. 40
#ossible causes lead to #7 of Boiler Feed Water is lo+er re5uired value is Chemicals are not efficiently p7 of # is lo+ p7 of treated condensate is lo+ p7 of demin"+ater is lo+ ab test
Q. 41
Which of the follo+ing statement is correct?
Q. 42
#urpose of ; purging< step during start up boiler is $emove 7C
Q. 43
!f 9%cess air in flue gas of boiler increase that can made Waste heat=
Q. 44 Answer
*he boiler feed +ater (BFW) from BFW pump +ill bring to *he steam boiler ( Or steam drum) (Source. http.en/+i0ipedia/org+i0iBoiler>feed+ater>pump)
Q. 45
#ossible causes lead to e%plosion boiler are As seen today, boiler e%plosions are of t+o 0inds/ "
" Answer
8ne 0ind is a failure of the pressure parts of the steam and +ater sides/ *here can be many different causes, such as failure of the safety valve, corrosion of critical parts of the boiler, or lo+ +ater level/ Corrosion along the edges of lap 6oints +as a common cause of early boiler e%plosions/ *he second 0ind is a fuelair e%plosion in the furnace, +hich +ould more properly be termed a firebo% e%plosion/ Firebo% e%plosions in solid"fuel" fired boilers are rare, but firebo% e%plosions in gas or oil"fired boilers are still a potential ha&ard/
