FEED WATER TREATMENT

1. SENTHUR POLYTECHNIC COLLEGE
DEPARTMENT OF MECHANICAL ENGINEERING
4020520/THERMIAL ENGINEERING II
SEMINAR PRESENTATION
Submitted by
SIRANJIVIRAM.M
(22216402)
Seminar Topic
FEED WATER TREATMENT

2. FEED WATER TREATMENT

3. What is mean by the feed water treatment ?
• Natural water contains solids liquid and geseous impurities,hence
this water cannot be used directly for steam generation in the boilers
• The impurities peresent in the feed water should be removed before
it is supplied to the boiler
• It is necessary to remove the impurities of the natural water .
• If the natural water is supplied to the boiler without filtration
• It will cause damage to the boiler
• It generates the corrosion,rust,poor heat transfer and causic
embrittliement

4. Types of feed water treatment
• MECHANICAL FEED WATER TREATMENT
• CHEMICAL FEED WATER TREATMENT
• THERMAL FEED WATER TREATMENT
• DEMINERALISATION

5. Mechanical feed water treatmet
• In mechanical feed water treatment, untreated water passes through a mesh
filter or cartridge that traps suspended particles on the surface or within the
filter.
•
• Mechanical water filters mostly remove larger suspended material from water,
including sand, silt, clay, loose scale, and organic matter.
• These filtration systemsdo not remove dissolved chemicals or very small
particles.
• When used in combination with other water treatment equipment (as is often
the case), they can be helpful in removing dissolved or very fine particles. For
example, they can remove iron, manganese, or hydrogen sulfide after they are
converted from dissolved to particulate states by a separate oxidation treatment
water systeminstalled before the mechanical filtration unit.

6. CHEMICAL FEED WATER TREARMENT
• There are two general approaches to conditioning sludge inside a boiler: by
coagulation or dispersion. When the total amount of sludge is high (as the
result of high feed-water hardness) it is better to coagulate the sludge to
form large flocculent particles. This can be removed by blow-down. The
coagulation can be obtained by careful adjustment of the amounts of
alkalis, phosphates and organics used for treatment, based on the fee-
water analysis. When the amount of sludge is not high (low feed water
hardness) it is preferable to use a higher percentage of phosphates in the
treatment. Phosphates form separated sludge particles. A higher
percentage of organic sludge dispersants is used in the treatment to keep
the sludge particles dispersed throughout the boiler water.

7. DEMINERALISATION
• Demineralization is the process of removing minerals ions from HA
crystals of hard tissues, for example, enamel, dentin, cementum, and
bone. Restoring these mineral ions again to the HA crystals is called
remineralization
• In demineralization, cations in the feed water are exchanged for
hydrogen (H+) ions and cations are exchanged for hydroxyl (OH–)
ions. The result is water: H+ + OH-OH → H2O. In general,
demineralization IX systems are available in either two-bed or mixed-
bed configurations

8. THANK YOU