POWER PLANT EQUIPMENTS LONG SHUTDOWN
PRESERVATION METHODS
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SL NO.
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EQUIPMENT
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PRESERVATION
METHOD
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A
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MECHANICAL
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1
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Boiler
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1-Wet preservation (If shutdown
period is up to one month)
Maintain pH: 10-10.5 Hydrazine concentration :> 200 ppm Note: Check water sample at various locations like steam drum, mud drum, super heater, economiser & Water wall tubes. Concentration should be same at all collection points 2-Dry Preservation (If shutdown period is more than one month) |
2
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Deaerator & Surge tanks
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Wet preservation
Maintain pH: 10-10.5 Hydrazine concentration :>200 ppm |
3
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Travelling grate (TG)
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After cleaning, inspection &
Maintenance, keep run TG at least 10-15 minutes on every 6-7 days to avoid
shaft jam in bush/bearings
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4
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ESP
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After cleaning & Inspection,
close all the man hole doors air tight & keep lime trays at various
locations to avoid moisture accumulation on internals
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5
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APH & Economiser
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After cleaning & Inspection,
close all man hole doors air tight & keep lime trays at various locations
to avoid moisture accumulation on internals
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6
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Boiler fans
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After cleaning &
Inspection..close all man hole doors air tight
Change the shaft orientation at every 10-15 days by rotating shaft manually to avoid shaft sagging/bending |
7
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Boiler feed pumps
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Keep suction valve open
Change the shaft orientation at every 10-15 days by rotating shaft manually to avoid shaft sagging/bending |
8
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Air Compressors
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Operate Air compressors at least
10-15 minutes at every 7-8 days or else rotate the flywheel one complete
rotation
|
9
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Main & Auxiliary cooling water
pump
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Rotate the shaft on every 10-15 days
to avoid impeller jam in wear ring
|
10
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Steam Turbine
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1-Turbine dehumidification by blowing
hot air through Turbine HP suction to LP suction & ensure relative
humidity in Turbine is <40%
2-Put turbine on barring gear for 20-30 minutes at every 6-7 days 3-Operate HP & LP valves from 0 to 100% at every 15 days 4-Operate ESV at every 15 days |
11
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Turbine lub oil system
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Keep "ON" oil centrifuge at
least twice in a week
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12
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Ash handling system
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Ensure all ash handling & storage
systems are clean to avoid rusting/corrosion
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13
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Fuel feeding system
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Maintain fuel feeding system
internals clean to avoid corrosion & rusting
|
B
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E&I
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|
1
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Generator
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Keep "ON" Generator space
heaters for 8-10 hours if atmosphere temperature is very less (In rain &
winter seasons)
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2
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Power Transformer
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Charge transformers at least 6-8
hours at every week to avoid moisture formation in oil
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3
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VFD drives
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Keep charged all VFD drives
continuously
Note: Avoid interruption of power supply to VFDs |
4
|
Batteries
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Inspect battery voltages regularly
(twice in a month)
|
5
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UPS & AVR
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Check Healthiness of redundancy
systems regularly
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6
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Motors
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1-Cover all motors terminals by
polythene covers to avoid entry of rain water
2-For higher KW motor keep "ON" space heaters |
7
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MCC & PCC
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Keep lime trays at MCC, PCC to avoid
moisture formation
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8
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DCS
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Ensure DCS healthiness regularly
Note: If DCS kept OFF, inspect the panels regularly to ensure rats/lizards are not entering into the panels |
C
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WTP
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|
1
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RO plant
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Preserve RO membranes with 2-3% SMBS
or other chemical for 30-40 days. After that drain the preserved water & perform membrane
flushing on every 7-8 days
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2
|
Cooling tower
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If CT is not necessary in shutdown,
drain the cooling tower ,clean the sumps & apply lime
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3
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Cat ion & Anion Resin
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Maintain normal water level in
vessels
Replace the vessels water at every 10-15 days |
D
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SAFETY
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1
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Fuel yard & Fuel handling
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Depute a particular person to have
daily round to avoid fire incidents due to saturation of coal/bagasse or any
other fuel
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2
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Fire fighting system
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Conduct fire fighting pumps trial
(especially Diesel fire fighter pump & Main fire fighter pump) to ensure
healthiness
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3
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Plant fire alarm system
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Check Healthiness of fire alarm
systems regularly
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Power plant and calculation site basically includes the detailed study of power plant operation and maintenance, its related all calculations and thumb rules. It also involves detailed troubleshooting guides for operation and maintenance of power plant system/equipments like Boiler, fans, compressors, belt conveyors, ash handling system, ESP, steam turbine, cooling tower, heat exchangers, steam ejectors, condensers WTP. etc. Heat rate, efficiency
How do you preserve the power plants equipments in long shutdown??
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Sir can we keep storage tanks and deaerator in dry conditions sealing all man hole doors.
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