Mattias Svensson, Program Secretary of BiogasÖresund in Denmark, Institute of Environment & Resources, Technical University of Denmark

Transcription

1 Biogas from solid biomass - what does the German market offer? Mattias Svensson, Program Secretary of BiogasÖresund in Denmark, Institute of Environment & Resources, Technical University of Denmark

2 Different Technologies Batchwise digestion Bioferm Plugflow digestion Kompogas Archea Schmack Dranco-Farm Fodder maize = energycrop no. 1 Conventional slurry digestion with solid material feeding Biowatt

3 Biowatt Mücklingen Conventional slurry digestion, 7-9% TS (15% in) Innovative stirring and loading higher and faster gas prod., no crust formation days retention time Relatively low need of energy (15% heat, 8% el.) 1200 kw el, 2,9 millions EUR

4 Biowatt - feeding Fodder maize (5 cm) less size no advantage The feeder is filled once a day (wood chip technology)

5 Biowatt - feeding Air is pressed out of the fed material Mixing with recirculated process leachate Feeding once an hour

6 Biowatt the reactor Prefab elements Construction time 3+2 months Special concrete Protective coating in the headspace area

7 35% Biowatt 1200 kw el 65% = 4,5kg VS/m 3 *d Reactors coupled in series Average loading = 3,5kg VS/m 3 *d

8 Kompogas Horizontal plugflow, thermophilic, no post-digestion 50+ plants built, mostly municipal solid waste but is expanding its energycrops market share Modular construction in steel or concrete, tons/year Pushing for vehicle fuel (upgrading + distribution)

9 Kompogas - waste days, 9kg VS/m 3 *d Energy: 50% heat, 14% electr. + Buoyant shaft, panel heating + Robust (none opened 10 yr) + Handles all substrates, efficient + Small footprint - Pricetag (?) FS = Fresh Substrate

10 Kompogas - Energycrops Plant in Reimlingen, Germany, 1,3 MW el Double reactor, 3000m 3, days HRT Energy economy unknown, better than for waste treatment 6-7 kg VS/m 3 *d; 31% TS in, 12% out

11 Archea 2 stages: horisontal plugflow (15 days mesoph., 15-18% TS) + stirred post digestion (70 d thermoph.) Modular constr., adjusted to truck capacity (250kW el plugflow reactor = 2 trucks) 1 mill.. EUR/module, 31 plants sold 2007 (august) Energy need: 6-8% electr., 20-25% heat Active marketing, follow-up programs

12 Archea 250kW el 12kg VS/m3*d! 15 days 70 days Not shown: Outtake of inerts and crust layer; recirc. of digestate ThermDes: 70 C, 1,1 bar % gas prod. (5% of total inv.)

13 Archea 1,4MW el 4 x 320m 3 plugflow 2 x 2500m 3 post digestion 1 x 5000m 3 storage 5 millions EUR District heating First large-scale

14 Archea 1,4MW el Inerts removal ThermDes Clamp silo constr. Feeding

15 Schmack 2-stage digestion just as Archea Only concrete, different stirring Larger modules available; plugflow 1000m 3 Heating via stirring shaft Dominant, spread all over Germany Injection into the gas grid (coop. with Carbotech)

16 Schmack - plugflow Mesophilic m 3 Heating in the shaft Automatic inerts removal

17 Schmack - postdigestion Mesophilic m 3 Shaft + wall heating 3D stirring

18 Schmack 1,3MW el 2 plugflow, 2 postdig. 5 millions EUR Distr. heating of spa

19 Dranco-Farm Nüstedt Vertical thermophilic plugflow, 17% TS (30% in) No moving parts inside of the reactor Intensive recirculation, exterior mixing 1300m 3, 800 kw el, 2,7 millions EUR Can handle all substrates, yield exceeds the one of lab trials Walking floor, loaded 2 times/day

20 Dranco-Farm Circulation time: 1-2 days Retention time: 4-5 days Ca 30 ton/day 500kW el 95% 5% Source of picture: L. D. Baere, AD11, Brisbane 2007

21 Dranco-Farm Complex but effective transport of material Low energy need (Heat: 10kW, Electr.: 30kW ca 5% of generated electricity) Feeding (1 of 2) Recirculation (1 of 4) Outlet (15% TS, diluted with rain water in the end storage) Max. heating effect: 40kW

22 Dranco-Farm Fast startup (3 months) Constr. time: 8 months 10kg VS/m 3 *d, 5,5m 3 biogas/m 3 *d Source of picture: L. D. Baere, AD11, Brisbane 2007

23 Bioferm - Prinzhöfte Batchwise digestion of stackable biomass in garage Two reactor cells, each 150 m3 50 kw el, 70kW heat Fresh/digested mixed (3:7), leachate recirculated 21 days/reactor, 60 days on average Controlled ventilation before emptying EUR Repaid in 10 years Photovoltaics!

24 Bioferm Animal farm, 20 cows, 15 sows and 70 sheep Preservation of local race of sheep need to take care of grass cuttings from fallow land All heat is utilised maximum bonus (energycrops, new technology, heat) Solid fertiliser spreading

25 Thanks for your attention! Any questions? Mattias Svensson