Reuse, Recover, Recycle Stefan Salzmann 4th November 2018 · Alkali-wäscher Speisewasser-behälter...
Transcript of Reuse, Recover, Recycle Stefan Salzmann 4th November 2018 · Alkali-wäscher Speisewasser-behälter...
Centralized Sludge Incineration Reuse, Recover, Recycle
Stefan Salzmann 4th November 2018
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Outotec
2
F&E, Verkaufs- und
Servicezentren in
36 Ländern
Lieferungen in mehr als
80 Länder Mitarbeiter
von über
60 Nationalitäten
Umsatz MEUR 1.139 in 2017
4.146 Mitarbeiter
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Sludge disposal canton Zürich - Strategy
•In year 2005 canton Zürich launched the strategy for coordinated sewage sludge disposal
•The reason for that: • Disposal security for the whole canton • Possibility for phosphorous recovery • Energy usage • Costs for disposal
• In year 2010 the decision was made to build a centralized sewage sludge incineration plant in Zürich Werdhölzli
•Since 2015 the delivery of dewatered sludge from the whole canton to the incineration plant is taking place the plant is in operation
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Facts and numbers in canton Zürich
•100 000 t/a sludge formation with 20-40% DM in more than 70 waste water treatment plants
•70 000 t/a sludge needs to be transported
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Sewage sludge utilization plant in Zürich
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Process Flow Diagram
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G
Ca(OH)2
Trockner 1
Trinkwasser
KWH
Deminanlage
Sand
Trockner 2
SPW Behälter
GAA
Brauchwasser
Aktivkohle
Wirbelschicht-ofen
Abhitzekessel
Elektrofilter
Sprüh-trockner
Gewebefilter
Turbine
Schlammbunker
Saugzug Kamin
Verbrennungsluftgebläse
Brüdenkondensation
ReststoffAsche è P-Recycling
Reaktor SaurerWäscher
Alkali-wäscher
Speisewasser-behälter
Schlammanlieferung extern
Schlammanlieferung intern
Störstoff-abscheider
Emissions-messungen
Kondensat-behälter
HD-Dampf (Hochdruck)
ND-Dampf (Niederdruck)
Erdgas
Deminwassertank
Kühlwasserkreislauf
Wärme zur KWH
Brüdenkondensat zum Klärwerk
Rücklauf von KWH
ND-Dampf
KSV Zürich Verfahrenstechnisches ProzessschemaKlärschlammverwertung
Baujahr 2015GAA
Trockner
Druckluft
Kompressoren
NotstromdieselDiesel
Wäscher
H2O
Verdichter
850°C – 950°C
24 000 m³/h i.N.
875 kWel
100 000 t/a =30 000 tTS/a
150 - 400°C
160 -180°C
120 - 140°C
75°C
4 500 kWth
16 000 m³/h i.N.
Normalbetrieb: 0 Nm³/h
Biofilter
Dampftrommel
14 000 t/a 600 t/a
NH4OH
SNCR
Wärme zur GAA
Rücklauf von GAA
1 000 kWthND-Dampf
NaOH
ND-Dampf
130°C
95°C
Emissionen nach LRVStaub < 10 mg/Nm³Pb+Zn < 1 mg/Nm³Hg < 0,1 mg/Nm³Cd < 0,1 mg/Nm³SO2 < 50 mg/Nm³HCl < 20 mg/Nm³HF < 2 mg/Nm³NOX < 80 mg/Nm³NH3 < 5 mg/Nm³CO < 50 mg/Nm³Dioxine < 0,1 ng/Nm³
27 000 m³/h i.N.
ND-Dampf
Speise-wasser
Speise-wasser
450°C9,7 t/h
60 bar 7 bar170°C
ND-Dampf
Centralized sludge incineration, Stefan Salzmann 4/12/2018
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North elevation
7
Solid Building • Sludge Bunker • Rooms for Electrical Eqt. • Central HVAC • Control Room • Biofilter (on roof)
Incineration Hall (Structural Steel)
• Main Process Eqt.
Centralized sludge incineration, Stefan Salzmann
22 m
4/12/2018
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Main guaranties and achieved values for the nominal capacity
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Description Unit Guarantee Achieved Comment
Power production kWh/h 875 910 Higher heating value
Power consumption kWh/h 850 < 830 Process and potable water m³/h 5 5
Natural gas Nm³/h 420 MWh per year incl. star-up
0 in operation
Caustic soda NaOH kg/h 62 155 Guarantee based on 0,5% S in sludge, actual 1,0 – 1,2%
Lime hydrate Ca(OH)2 kg/h 19 20
Ammonia water NH4OH kg/h 45,3 < 5 In normal operation rarely needed
Activated carbon kg/h 1,25 < 1 Continuously Hg measurement
Sand kg/h 2,5 0 Depends on sand amount in sludge
Heat output kWh/h 4’450 4’550
Centralized sludge incineration, Stefan Salzmann 4/12/2018
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Operational data KSV for 2016
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Parameter Value Unit
Hours of operation 7‘388 h
Revision acc. to plan 987 h
Unplanned disturbance 244 h
Unplanned disruption (sludge not available) 165 h
Burned sludge 84‘131 t
Steam production 60‘435 MWh
Power production 5‘282 MWh
Power consumption 5‘694 MWh
Heat production (usefull heat) 27‘715 MWh
Sludge ash 13‘404 t
Residue from flue gas cleaning 709 t
Centralized sludge incineration, Stefan Salzmann 4/12/2018
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Emissionslimits for Switzerland and Europe
Parameter Switzerland LRV (Luftreinhalte-verordnung)*
Europe Guideline 2010/75
Unit
CO 50 50 mg/m³ i. N.
SO2 50 50 mg/m³ i. N.
HCl 20 10 mg/m³ i. N.
HF 2 1 mg/m³ i. N.
Dust 10 10 mg/m³ i. N.
NOx als NO2 80 200 mg/m³ i. N.
NH3 5 non mg/m³ i. N.
Cd 0,1 mg/m³ i. N.
Cd + Tl 0,05 mg/m³ i. N.
Hg 0,1 0,05 mg/m³ i. N.
Pb + Zn 1 mg/m³ i. N. Sb, As, Pb, Cr, Co,
Cu, Mn, Ni, V 0,5 mg/m³ i. N.
Dioxine und Furane 0,1 0,1 ng TEQ/m³ i. N *daily average
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Achieved yearly emissions 2017, Average
Parameter Switzerland LRV (Luftreinhalte-verordnung)*
Achieved (average of the CEMS
in 2017) Unit
CO 50 2,1 mg/m³ i. N.
SO2 50 7,2 mg/m³ i. N.
HCl 20 0,1 mg/m³ i. N.
Staub 10 2,3 mg/m³ i. N.
NOx als NO2 80 41,6 mg/m³ i. N.
NH3 5 2,2 mg/m³ i. N.
Hg 0,1 0,01 mg/m³ i. N. *daily average
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Zürich – successful in operation since 2015
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Down stream process for ash from SIP •Ash from SIP contains 10–22 % of P2O5
•> 99.8 % of the ash is removed as “clean ash” in the ESP of the SIP
•A long list of different process developments are known wet or thermal
•Outotec’s Ashdec process converts ashes into a plant available P-fertilizer
•Trials with ashes from SIP have shown positive results on P-solubility in neutral Ammonium Citrate.
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Outotec, Frankfurt
4/12/2018
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Summary
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Sludge Incineration Zürich •Successful in operation since 2015
AshDec •Thermochemical process with alkaline compound
•Low residue amount •Possible integration to incineration plant
•P recovery > 95 % •PNAC > 80 %
NAC = Neutral ammonium citrate
4/12/2018