Asset management begins with correct water treatment

Transcription

1 Asset management begins with correct water treatment

2 Danish District Heating Association Correct Water Treatment: A starting point for proper Asset Management: Correct water treatment specified for an installation Help optimize life cycles for critical system 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.

3 Correct water treatment help to avoid several corrosion types of pipes etc. Corrosion type: Pitting Microbial subject to corrosion Coating corrosion / Covering corrosion

4 Correct water treatment help eliminate/minimize biofilm and deposits. Minimizing formation of deposits Minimizing formation of biofilm, of which bacteria live. Improve efficiency in heat transmission

5 Oxygen in water causes corrosion Corrosion leads to water leakages Corrosion reduce lifetime cycle for key assets such as pipes, fittings, heat exchangers etc. Costs for interruption of supply during maintenance / replacement of pipes etc. In conclusion: Added operational costs (OPEX) for the district heating company - if water treatment not correct!!

6 Take care of KEY ASSETS! Protect your Investment

7 Today s speaker: Jørn Urup Nielsen Group Director Sales. EUROWATER Denmark. Leading, European Water Treatment Manufacturer DH / CHP / WtE EfW / Boiler Heating Plants a.o. Focus on District Heating for several years. Awarded Person of The Year By Danish Board of District Heating. Worked with international utility business since 1993.

8 Danish manufacturer of water treatment 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.

9 Ground water Conductivity app µs/cm Drinking water Conductivity app µs/cm Softened water Conductivity app µs/cm Demineralized water Conductivity app µs/cm Ultra-pure water Conductivity app µs/cm Oxydation and filtration Softening by ion exchange Reverse osmosis Demineralization by Ion exchange Or EDI Removed elements Iron (Fe ++ ) Manganese (Mn ++ ) Ammonium (NH 4+ ) Nitrite (NO 2- ) Aggressive carbon dioxide (CO 2 ) Phosphorus (P) Arsenic (As +++ ) Hydrogen sulphide (H 2 S) Methane (CH 4 ) Removed elements Calcium (Ca ++ ) Magnesium (Mg ++ ) Removed elements 98 % salts Potassium (K + ) Sodium (Na + ) Chloride (CI - ) Nitrate (NO 3- ) Sulphate (SO 4 -- ) Silicic acid (SIO 4- ) Alkalinity (HCO 3- ) Removed elements Sodium (Na + ) Chloride (CI - ) Nitrate (NO 3- ) Sulphate (SO 4 -- ) Silicic acid (SIO 4- ) Alkalinity (HCO 3- ) Filtration of water - From ground water to pure water

10 Examples of components of water Inorganic salts Calcium, magnesium, sodium, ammonium, iron, manganese, bicarbonate, chloride, sulfate, fluoride, nitrate and silica Organic compounds Humus, gasoline/oil, solvents and pesticides Particles Sand, organic matter, rust and colloids Micro organisms Bacteria, viruses, algae and fungi Gases Carbon dioxide, oxygen, nitrogen, methane and hydrogen sulphide Heavy metals Zink, chrome, nickel, copper, lead, cadmium, mercury and arsenic

11 Water Treatment for District Heating

12 Make-up Water and Circuit Water

13 SM/SG SMH/SML/SMP SFH/SFHG STFA Softening Units soften water only through use of salt. Up to 150 m³

14 10 Softened water Annual exchange rate 5 1 0,5 Intermedia stage Desalinated water 0,1 0,1 0,5 1,0 5, MW Plant size 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.)

15 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.

16 Solution: Reverse osmosis units (RO) RO A1 Flow up to 180 L/h RO B1 Flow up to 2.0 m 3 /h RO B2 Flow up to 14 m 3 /h Removes: Salts Bacteria Virus Pesticides In district heating salt contributes to corrosion. and also nutrients to bacteria. RO C3 Flow up to 38 m 3 /h RO C4

17 Membrane unit 75-80% recovery 25% 75%

18 Membrane units 85-90% recovery Reduction in wastewater = 40-60%

19 Features of RO-plants Retains % of water salts Retains <90 % the waters organic material CO 2 and O 2 is not retained! Further treatment needed Degassing Dosage with NaOH to raise/adjust ph (9,8 +/- 0,2) Overview

20 Problem: Oxygen - not removed by softening/desalination Oxygen: O 2 This picture: Oxygen corrosion due to a high level of oxygen and low ph-value in a district heating make-up water.

21 Asset Management Solution: Remove the Oxygen At low partial pressure we can remove a gas / oxygen from water using a membrane degasser.

22 Membrane Degasser and compact nitrogen generator Installation 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.

23 Problem: Particles Particles 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.

24 Solution: Bag filtration Operational problems due to particles: Abrasive effect Water meters brake and become inaccurate Corrosion preventing magnetite film compromised Sludge formation Removal of magnetic particles with magnet insert Non-magnetic particles removed with filter bags (5-10µ)

25 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 corroded pipes & 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). End User Benefits OPEX advantages Environmental & image (H&S)

26 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). Key Message from Danish District Heating Association

27 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.

28 Energie Steiermark in Graz, Austria recently 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).

29 Take care of your key assets! Thank you for listening.