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FREQUENTLY
ASKED QUESTIONS
Q.1:
How to improve poor boiler
steam-fuel ratio and increase
boiler efficiency?
Q.2:
Soot deposition in my boiler is
heavy. How to reduce soot
formation and deposition?
Q.3:
Blow down losses are heavy, how
to reduce blow down rate?
Q.4:
There is corrosion problem in
the pressure parts on F.W.
circuit, how to overcome the
problem?
Q.5:
In my boiler, Burner tip choking
is frequent, How to solve it?
Q.6:
Chimney emits blackish smoke
frequently, how to ensure proper
stack emission?
Q.7:
How to avoid frequent Drum water
level sight glass failure?
ANSWERS:
Q.1:
How to improve poor boiler
steam-fuel ratio and increase
boiler efficiency?
Answer:
For occasional low efficiency
--- clean the burner tips and
fuel oil pumps filters, check
for viscosity of fuel oil,
burner tip holes and atomizing
steam pressure.
For continuously low efficiency
-- check flame colour, if the
colour of the flame is not
bright golden yellow, combustion
is poor. Take remedial measures
mentioned as above and
additionally check the
following.
If stack temperature is high,
there is soot deposition in the
boiler. Stop the boiler and
carry out cleaning of the
boiler. Check water side
deposition/ scale formation. If
scale formation is observed,
plan for cleaning the boiler
with appropriate method.
Evaluate for installation of economizer
and soot blowing frequency.
Top
Q.2:
Soot deposition in my boiler is
heavy. How to reduce soot
formation and
deposition?
Answer:
The reasons for heavy soot
deposition are:
i)
Poor quality of fuel with higher
ash content metals, high
insolubility, ensure the quality
of fuel.
ii) Poor combustion; improve the
combustion by checking Atomizing
Steam pressure by cleaning
burner tip and fuel oil system
filters and checking viscosity
near burner tip.
iii)
Avoid mixing of different types
of fuels .
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Q.3:
Blow down losses are heavy, how
to reduce blow down rate?
Answer:
i) Monitor boiler
water treatment. All volatile
treatment is better than
conventional treatment if there
is techno-economical
feasibility.
ii) Check water treatment
process for seepage of Chloride,
Silica, etc. Check TSP quality
for Chloride content.
iii) Fine control of KBD with
increased frequency of Blow Down
water will help in saving of
energy & boiler water.
Top
Q.4:
There is corrosion problem in
the pressure parts on F.W.
circuit, how to overcome the
problem?
Answer:
i) Check proper deaeration in
the Deaerator. D.O. should be
less than 7PPB
ii) Maintain N2H2
at desired level in the BFW.
iii) Maintain pH more than 9 in
the CBD water.
iv) Closely monitor TSP level in
the CBD water.
v) Check feasibility of change
over of BFW treatment to AVT.
vi) Verify for proper selection
of oxygen scavenger if used.
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Q.5:
In my boiler, Burner tip choking
is frequent, How to solve it?
Answer:
To avoid frequent Burner tip
choking, check for - poor fuel
quality, improper fuel
temperature/ viscosity at Burner
tip, high ash
content in the fuel and passing
of sludge particles through
filter. Check for filter
mesh size.
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Q.6:
Chimney emits blackish smoke
frequently, how to ensure proper
stack emission?
Answer:
Blackish smoke for chimney
indicates poor combustion or
inadequate combustion air, take
necessary action to improve
combustion and adjust fuel-air
ratio. If ID and FD dampers are
not free, the operation will be
sluggish and result in poor
combustion during load
variation. Rouse the damper.
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Q.7:
How to avoid frequent Drum water
level sight glass failure?
Answer:
After repairing of level glass
assembly, carry out hot
tightening of bolts applying
proper torque. Use good quality
of gasket,
suitable for the temperature and
pressure.
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