Slamförbränning. - var står man teknikmässigt och hur gör man i vår omvärld? Martin Hostrup, Rambøll

Transcription

1 Slamförbränning - var står man teknikmässigt och hur gör man i vår omvärld? Martin Hostrup, Rambøll

2 SLUDGE INCINERATION Sludge incineration: EU and other places Sludge incineration example: Technology overview Energy recovery from sludge Emissions Recovery of phosphorous from ash Sludge incineration cost

3 SLUDGE DISPOSAL PATHS Energy production Anaerobic Digestion Sludge Incineration Sludge Fertilizer use Recovery of phosphorous Energy recovery Land fill Ash for construction 3

4 Incineration: EU: 27% NED: 100% GER: 53% DK: 45% SWE: 4% CH: towards 100%

5 SEWAGE SLUDGE INCINERATION, HONG KONG Sewage Sludge facility 650,000 tonnes of municipal sewage sludge annually at 30% dry solids Electricity production From design review and certification, procurement, testing to commissioning validation Commissioning: 2015

6 SLUDGE INCINERATION IN DENMARK:?: ton TS/h Lundtofte RA: ton TS/h Lynetten RA: ton TS/h Avedøre RA: ton TS/h

7 BIOFOS & LYNETTEN 3 WWTPs Lynetten, Avedøre, Damhusåen 1,2 Mio. PE Lynetten: Largest WWTP in Denmark 3 x m 3 digesters+ 2 under constr. Sludge drying to 35% DM Capacity ton DM/yr digested sludge 20% from Damhusåen and 10% external

8 For energy recovery Screenings Iron salts Emergency by-pass Iron salts Sand dewatering Sand and grease primary Concentration tank Primary sludge Bio-P Anaerobic Digester Pumping Recycle sludge Biological sludge Gas storage Aeration Boiler City gas network Heat Pumping Post clarification Polymer Mixer Drier Fluid-bed furnace and boiler Electrofilter Bag house filter Wet scrubber and flue gas condensation Stack 8

9 ANAEROBIC DIGESTION AND GAS DISTRIBUTION Bio gas production at Lynetten: 7 mill. m³ per year Sale to city network started 2014 Cleaning 4 km City Network Sludge Digesters m 3 Bio gas Sludge to centrifuges Gas storage Boiler District heating Support fuel for furnace Flare 9

10 DEWATERING AND DRYING Digested sludge tonnes/year dry solids Heat recovery: MWh/year Air to furnace Polymer From digester Steam Condenser District Heating 25% dry Condensate Dryer Hot water 35% dry Pre-dried sludge to furnace 10

11 SLUDGE INCINERATION Lime, Ca(OH)2 Fluid-bed furnace and boiler Drying Electrofilter District Heating Fly ash Reactor Bag house filter Flue gas residue Wet scrubber and flue gas condensation District Heating 11

12 THERMAL BALANCE OF COMBUSTION SYSTEM Energy recovery: 70% of dry sludge energy content THE WORLDS MOST ENERGY EFFICIENT SLUDGE INCINERATION PLANT!? 12

13 FLUE GAS CONDENSATION, PRINCIPLE ΔT ~ 2-5 C 55 C 52 C 50 C District heating Saturated flue gas 75 C 70 C 65 C District heating Condensate Condensing packed bed scrubber 13

14 For energy recovery Screenings Iron salts Emergency by-pass Iron salts Sand dewatering Polymer Sand and grease Primary settlement Concentration tank Primary sludge Mixer Bio-P Anaerobic Digester Pumping Recycle sludge Biological sludge Gas storage Aeration Boiler MWh City gas network Heat Pumping Post clarification Bio gas MWh Heat MWh Drier Fluid-bed furnace and boiler Electrofilter Bag house filter Wet scrubber and flue gas condensation Stack 14

15 EMISSIONS Lime, Ca(OH)2 To stack: 6000 Nm3 / ton DM Fluid-bed furnace and boiler Drying Electrofilter District Heating Fly ash Reactor Bag house filter Flue gas residue Wet scrubber and flue gas condensation District Heating kg/ton DM kg/ton DM 15

16 AIR EMISSIONS 2012 Pollutant mg/nm³* CO 1,3 TOC 0,1 Particles 0,3 HF 0,1 HCl 0,6 SO2 3,1 NOx 26 Hg <0,0005 Sum 9 metals < 0,01 16

17 EMISSIONS (METALS), PERSONS 43 g 480 g

18 RECOVERY OF PHOSPHOR FROM ASH Technologies still under development: OutoTec offers an add-on solution to their sludge incineration plants. However phoshor from the product is not easily absorber by pants Other technologies are less developed however the product is more attractive Drivers: Example: In CH land use is banned and recovery of phosphor will by a requirement: Price development for phosphor:

19 SLUDGE INCINERATION COST Sludge incineration for ton DM per year Investment: M&E: 230 MSEK + Civil: 85 MSEK Treatment cost: 600 SEK per ton (25% DM) + transportation and fee for depositing ash The Avedøre plant near Copenhagen offers to receive sludge for incineration, for example 25% DM sludge at OC <64% 515 SEK/ton OC >64% 650 SEK/ton 19

20 VISIT OUR WEBSITE:

21 RAMBÖLL GP WATER SVERIGE VA-PROCESS/SLAM OCH BIOGAS/ VA-TEKNIK/VATTENRESURSER Umeå Sundsvall Uppsala Stockholm Linköping Göteborg Malmö