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8/10/2019 total water mangment.pdf
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TOTAL WATER MANAGEMENTSOLUTIONS
for
POWER INDUSTRY
by:Ion Exchange India Ltd.
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Critical Impurities in Water
Total Dissolved Solids
Dissolved Silica
Colloidal Silica
Total Organic Carbon / Organics
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Pretreatment of Water
Objective is to remove all undissolved impurities presentin water and minimise operational problems indownstream RO and DM plants.
Undissolved impurities present in surface waters areSuspended solids
Colloidal particles
Colloidal organic matter and
Colloidal silica Algae
Bacteria
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pH 6.8 - 7.2 Conductivity < 0.2 MS/cm Total iron Nil Total silica < 0.02 ppm Total hardness Nil
Quality of Treated Water Required forFeed to High Pressure Boilers
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Boiler Water TreatmentObjectives
To keep makeup, boiler and condensate waterparameters as per design guidelines
Minimising blow down
Prevention of scales and deposits
Minimising corrosion
Eliminating priming and foaming
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Treatment Processes
Softening
De-alkalization
De-mineralisation
Reverse Osmosis
Ultra filtration
Condensate Polishing Unit (CPU)
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Most Critical Impurities
Silica
- Reactive- Non-Reactive
Organic Matter
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Most Critical Impurities
Reactive silica can be removed in DM plant
Non-reactive or colloidal silica gets converted into
reactive silica at high pressure & temperature in
boiler drum & results into scale formation.
Similarly Organic matter on the other hand splitsinto humic & fulvic acid.
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Presence of Organic Matter
Mostly of vegetable & animal origin Consists of molecular weight of carboxylic acid often
termed as Humic & fulvic acid
Causes :
Often break-down in Boiler , depresses pH & causes
corrosion
It effects the performance of resins and output of DM
plant
Tends to alter the surface tension of the boiler & causesfoaming
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Presence of Organic Matter
Methods for removal of Organic Matter
Pre-chlorination oxidises dissolved organic matter
Organic matter in colloidal form is removed by proper
coagulation, flocculation & clarification ( HRSCC )
It can be effectively removed by Ion Exchange resins
( Organic Scavenger ) INDION 830
Ultrafiltration
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Technologies for removal of
Non-Reactive Silica Pre-treatment of water ( Coagulation & Clarification)
Ultralfitration
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Pre-treatment of Water
Optimum removal of non-reactive silica : Ensure effective pre-chlorination of water
Maintain optimal pH condition Dosing of primary coagulants like alum, polymers for
flocculation
High rate solids contact clarifier ensures adequate
contact with colloidal particles & coagulants
Note : Coagulation can remove almost 60-70% of non-
reactive silica
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Advantages of UF in
Boiler Pre-treatment Removes colloidal silicates, aluminum and organics( humic & fluvic acids)
Reduce silica deposition on turbine blades
Reduce corrosion potential of high molecular weight
organics Reduce turbine maintenance
Reduce boiler feed chemicals Fewer make-up water upsets more on-line time
Less power purchase from utilities
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What Can UF Remove ?SilicatesColloids
Particulate Matter AlgaeBacteriaColiformVirusesGiardiaCryptosporidiumOils and GreaseProteins
Ultra Filtration
What can UF Reduce ?Total Organic CarbonColor components
What UF Cannot remove ?Salts
GasolineSugarsAlcoholsLow MolecularWeight Molecules
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UF Performance Colloidal SilicaRemoval
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Prestigious Projects
Seven stream softening plant,
each 1000 m3/h
At thermal power station,
Maharashtra State ElectricityBoard, 2 X 500 MW, India
Control panel for semi-automaticoperation, one of the largest in India for a
water treatment plant
Four stream demineralisation plant, 125 m3/h each
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Water treatment plant, three
sub-systems, total capacity
2200 m3/h
Condensate polishing units
At thermal power station, Maharashtra
State Electricity Board, 2 X 500 MW,
India
Prestigious Projects
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Key - Issues1. Scarcity of water & environmental concerns
2. Recycling of water, scrapping out - once thru' systems inold plants
3. New advanced technologies, like WBA - WAC & HRSCCfor higher effectiveness
4. Openness for introduction of new technologies
5. UMPP's & focus on more projects in coastal areas6. Division of labour, specialization of skills and O & M for
WTP installations
7. CPU for even smaller capacity plants(250 Mw cap.) forbetter PLF
8. Fire Side Chemicals
9. Speeding up R & M of plants
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THANK YOUTHANK YOU