Boiler water is the liquid phase of steam within a boiler. The term may also be applied to raw water intended for use in boilers, treated boiler feed water, steam condensate being returned to a boiler, or boiler blow down being removed from a boiler. Treating boiler feed water over 15 years. We manufacture water treatment plant for industrial boilers and power plant boilers with installation all India. To know more visit our website http://www.thermodyneboilers.com/ or mail @ sales1@thermodyneboilers.com

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2.  RAW WATER : Untreated water – Natural supplies
 TREATED WATER : Water treated for specific purpose
 FLITERED WATER : Water filtered through some process
 SOFT WATER : Water from which Ca & Mg ions have
been removed
 DM WATER : All minerals removed (Cations &
Anions)
 FEED WATER : Treated water fed to boiler
 BOILER WATER : Water inside the boiler drum
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3. • BOILER FEED WATER TREATMENT
• Quality of steam depends upon feed water
quality to control:
• Steam purity
• Deposits on inner boiler surfaces
• Corrosion inside the boiler
• Heat transfer is efficient only if the boiler
water is free from deposit-forming solids
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4. • Loss in boiler efficiency due to reduced heat
transfer
• Act as insulators
• Silica forms hard silica scales
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5.  Internal water treatment
• Chemicals are added to boiler to prevent scale
• Scale forming compounds are converted to free flowing
sludge, which can be removed by blow-down.
• Different chemicals for different water conditions, like:
• Feed water is low in hardness salts
• Small quantity of water is to be treated
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6.  EXTERNAL WATER TREATMENT:
• Removal of suspended/dissolved solids and dissolved
gases
• Pre-treatment: sedimentation and settling
• First treatment stage: removal of salts
• Processes
a) Ion exchange
b) Demineralization
c) De-aeration
d) Reverse osmoses
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7.  a) SOFTENING PLANT
• Water passes through bed of natural zeolite of
synthetic resin to remove hardness
• Base exchange: calcium (Ca) and magnesium (Mg)
replaced with sodium (Na) ions
• Does not reduce TDS, blow down quantity and
alkalinity
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8.  b) DEMINERALIZATION
• Complete removal of salts
• Cations in raw water are replaced with
hydrogen ions (H+)
• Anions in raw water are replaced with
Hydroxyl ions (OH-)
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9.  DE-AERATION
• Dissolved corrosive gases (O2, CO2)
expelled by preheating the feed water
• Two types:
• Mechanical de-aeration: used prior to addition of
chemical oxygen scavangers
• Chemical de-aeration: removes trace oxygen
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10. • O2 and CO2 removed by heating feed water
• Economical treatment process
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11. • Removal of trace oxygen with scavenger
• Sodium sulphite:
• Reacts with oxygen: sodium sulphate
• Increases TDS: increased blow down
• Hydrazine
• Reacts with oxygen: nitrogen + water
• Does not increase TDS: used in high pressure boilers
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13. THANK YOU
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