asset management begins with correct water treatment euroheat/2018-09... · 2019-01-11 ·...
TRANSCRIPT
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Asset management begins with correct water treatment
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Correct Water Treatment:
A starting point for proper Asset Management:
Correct water treatment specified for an installation –
• Help optimize life cycles for criticalsystem components, such as:
• Boilers, Heat Exchangers, Pipes & Fittings etc.
• Expensive chemicals may no longer be required –
• so contributing to OPEX plus
• Health & Safety.
• Secure operation, less downtime.
Danish District Heating Association
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Correct water treatment –help to avoid severalcorrosion types of pipes etc.
• Corrosion type:
• Pitting
• Microbial subject to corrosion
• Coating corrosion / Covering corrosion
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Correct water treatment –help eliminate/minimizebiofilm and deposits.• Minimizing formation of deposits
• Minimizing formation of biofilm, of which bacteria live.
• Improve efficiency in heat transmission
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• Oxygen in water causes corrosion
• Corrosion leads to water leakages
• Corrosion reduce lifetime cycle forkey assets such as pipes, fittings, heat exchangers etc.
• Costs for interruption of supplyduring maintenance / replacement of pipes etc.
In conclusion:
• Added operational costs (OPEX)
for the district heating company -
if water treatment not correct !!
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Take care of KEY ASSETS!
Protect your Investment
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Today‘s speaker:
Jørn Urup NielsenGroup Director Sales.EUROWATER – Denmark.Leading, European Water Treatment ManufacturerDH / CHP / WtE – EfW / Boiler Heating Plants a.o.
Focus on District Heating for several years.
Awarded ”Person of The Year 2014”- By Danish Board of District Heating.
Worked with international utility business since 1993.
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• Danish manufacturer of watertreatment solutions (since 1936)
• Approx. 400 employees
• 23 sales- & service branches, Continental Europe.
• Global installations.
• LARGEST BUSINESS SEGMENT: District Heating, CHP/WtE & Boiler Heating Plants.
• APPLICATIONS:Make-up water,
• circulation water,
• boiler water,
• flue gas condensation &
• cooling water.
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Filtration of water - From ground water to pure water
Ground waterConductivity app.
30-800 µS/cm
Drinking waterConductivity app.
30-800 µS/cm
Softened waterConductivity app.
30-800 µS/cm
Demineralized waterConductivity app.
5-30 µS/cm
Ultra-pure waterConductivity app. 0.06 – 0.2 µS/cm
Removed elementsIron (Fe++)Manganese (Mn++)Ammonium (NH4
+)Nitrite (NO2
-) Aggressive carbon dioxide (CO2)Phosphorus (P) Arsenic (As+++) Hydrogen sulphide (H2S) Methane (CH4)
Removed elementsCalcium (Ca++)Magnesium (Mg++)
Removed elements98 % saltsPotassium (K+)Sodium (Na+)Chloride (CI-)Nitrate (NO3
-)Sulphate (SO4
--)Silicic acid (SIO4
-)Alkalinity (HCO3
-)
Removed elementsSodium (Na+)Chloride (CI-)Nitrate (NO3
-)Sulphate (SO4
--)Silicic acid (SIO4
-)Alkalinity (HCO3
-)
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Examples of components of water• Inorganic salts
Calcium, magnesium, sodium, ammonium, iron, manganese, bicarbonate, chloride, sulfate, fluoride, nitrate and silica
• Organic compoundsHumus, gasoline/oil, solvents and pesticides
• ParticlesSand, organic matter, rust and colloids
• Micro organismsBacteria, viruses, algae and fungi
• GasesCarbon dioxide, oxygen, nitrogen, methane and hydrogen sulphide
• Heavy metalsZink, chrome, nickel, copper, lead, cadmium, mercury and arsenic
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Water Treatment for District Heating
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Make-up Water and Circuit Water
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Softening Units – soften water only through use of salt.Up to 150 m³
SM/SG SMH/SML/SMP SFH/SFHG STFA
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10
5
1
0,5
0,5 1,0 5,0 10 50 100
0,1
0,1 MW
Plant size
An
nu
alex
chan
gera
te
Softened water
Desalinated water
Intermedia stage
Indication for choice of water treatment in make-up water
Smaller systems adapt experiences from larger CHP Plants – due to TOC (Total Cost of Ownership – Life Cycle Expectancy etc.)
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Problem if water is not desalinated• Salts, bacteria, virus, pesticides, etc. exist in your water cycle.
In district heating salt contributes to corrosion, and serves as nutrients for bacteria.
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Solution:Reverse osmosisunits (RO)Removes:
• Salts
• Bacteria
• Virus
• Pesticides
In district heating salt contributes to corrosion. and also nutrients to bacteria.
RO B1Flow up to 2.0 m3/h
RO A1Flow up to 180 L/h
RO B2Flow up to 14 m3/h
RO C4RO C3Flow up to 38 m3/h
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Membrane unit – 75-80% recovery
75%
25%
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Membrane units – 85-90% recovery
Reduction in wastewater = 40-60%
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Overview
Features of RO-plants
• Retains 95 – 99 % of water salts
• Retains <90 % the waters organicmaterial
• CO2 and O2 is not retained!
Further treatment needed
• Degassing
• Dosage with NaOH– to raise/adjust pH (9,8 +/- 0,2)
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Problem: Oxygen
- not removed by softening/desalination
Oxygen: O2
This picture:
Oxygen corrosion due to a high level of oxygen and
low pH-value in a district heating make-up water.
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Asset ManagementSolution:Remove the Oxygen
At low partial pressure we can remove a gas / oxygen from water – using a membrane degasser.
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Membrane Degasserand compactnitrogen generatorInstallation for make-up water
-------------------------------------------
Alternative removal of oxygen is typically by use of chemicals.
Chemicals serves as nutricent for bacterias.
The decomposed chemicals results in increased conductivity.
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Problem:ParticlesParticles from drinking water and corrosion products, sand and organic material can cause serious blockages of heat exchangers, erode components and cause corrosion in the district heating system.
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Solution:Bag filtrationOperational problems due to particles:
• Abrasive effect
• Water meters brake and becomeinaccurate
• Corrosion preventing magnetite film compromised
• Sludge formation
• Removal of magnetic particles with magnet insert
• Non-magnetic particles removed with filter bags (5-10µ)
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End User Benefits
• Reduction of chemical consumption (>90%)
• Improved Health & Safety Issues for operational staff.
• Optimized life cycles for pipes, heat exchangers, boilers.
• Minimize interruptions of supply to consumers – due to less corroding pipes etc.
• Lower costs related to repairs/replacement of corrodedpipes & other capital equipment in plant and network.
• Lower water losses – less water leakage (cost savings). This is also causing an energy saving (pumped water).
• Less customer complaints (interruption of supply).
OPEX advantages
Environmental & image (H&S)
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Key Message from Danish District Heating Association
Recommendation by Danish District Heating Association:
• Avoid corrosion of expensive pipes, fittings etc. in networks + assets in plants (boilers, heat exchangers etc.).
• Minimize usage of chemicals.
• Remove oxygen(strongest solution: Membrane Degasser).
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How it works:Short Video (3 min.) Testimonial from a Danish District Heating company, who has implemented the water treatment recommendations from Danish District Heating Association.
www.eurowater.com
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Energie Steiermark in Graz, Austriarecently replaced their existing water treatment plant for producing make-up water to district heating.
One of their main concerns was to
avoid the use of chemicals.
By using a double pass RO Plant, membrane degasser and EDI Plant from EUROWATER, ultrapure water of a very high quality is produced.
(An EDI plant is used after RO for polishing demineralized water to obtain low levels of conductivity and silica).
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Take care of yourkey assets!Thank you for listening.