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Technical Equipment for agricultural anaerobic digesters in Europe

Technical Equipment for agricultural anaerobic digesters in Europe. Camilo Andrés Wilches Tamayo Biogas weser ems GmbH & Co KG. Table of contents. Company´s Presentation Possible Biogas Power Plant configurations Renewable raw materials Biowaste Technical equipment Feeding system

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Technical Equipment for agricultural anaerobic digesters in Europe

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  1. Technical Equipment foragriculturalanaerobicdigesters in Europe Camilo Andrés Wilches Tamayo Biogas weserems GmbH & Co KG

  2. Table of contents • Company´s Presentation • Possible Biogas Power Plant configurations • Renewable raw materials • Biowaste • Technical equipment • Feeding system • Pumping system • Heating system • Agitators • Gas storage in the digester • Pasteurization

  3. The company biogas weser ems GmbH & Co .KG is a company with over 10 years experience specializing in design, planning and construction of biogas power plants • More than 150 installed biogas plants • Installed capacity >98 MWel • Energy parks 8,5MWel • International Projects

  4. Possible configurations of the biogas plant • Renewable raw materials. • Majority of German plants (EEG 2004) • Independence of the farmer • Price 19 cent/kWh Germany • 13.5 cent/kWh Spain • 28 cent/kWh Italy • Special Equipment • Solid feeder • Pumps • Agitators Renewable raw materials. „NaWaRo“

  5. Possible configurations of the biogas plant • Biowaste • This region has an intensive food and livestock production • Waste market • Price 9 cent/kWh Germany • 13.5 cent/kWh Spain • 22 cent/kWh Italy • Special Equipment • Pasteuritzation unit • 2 Pumps are required • Double walled digester with leakage detection Biowaste

  6. Technical equipment Biogas Feeding system Heating system Digestates Storage Pumps CHP Biogas Biogas Digester 2 Digester 1

  7. Technical equipment Feeding system

  8. Technical equipment Feeding system Depends of the substrate • Dry matter < 12% pumped from tanks to the digesters • Dry matter > 25% solid feeder and augers to the digesters Configurations: Walking floor : corn, cereals (size 20-120 m³) Mixer feeder: straw (size 8 -80m3) manure + straw paste materials (powder) liquid producing materials

  9. Technical equipment Feeding system Pumps

  10. Technical equipment Pumping system In general a susbtrate is pumpable when: Dry matter <12 %, homogeneos, particle size < 12mm Pumping system: Any possible substrate movement is allowed

  11. Technical equipment Pumps Most of the pumps used are Positive Displacement Pumps Pumps type: • Rotary lobe pump: price high wear (more maintenance) + size - easy maintenance suction capacity < 0,9 bar • Progresive cavity pump: less maintenance time demanding maintenance + high pressure (25 bar) - suction capacity < 0,9 bar 500 kW power plant 11 kW, 50 m3/h

  12. Technical equipment Pumps • Long distance between substrate storage tank and pump station ? • Centrifugal pump • directly in the tank • Normally used for manure • DM= 8% 11 kW 90 m3/h.

  13. Questions? (Break 5 min)

  14. Technical equipment Feeding system Heating system Pumps CHP

  15. Technical equipment Heating system • Heat requirements (625 kW biowaste): • Heat up substrate (8°C to 40°) = 38,64 kWth • Maintain temperature digesters = 170 kWth • (outside temperature -12°C) • Pasteurizer 70°C 1 hour = 80 kWth • External user (green house, industry,,,) P el A B P th Exhaust gas P th hot water P th losses T= 40° T= 35° • Energy Flow gas motor 625 kWel Intercooler 1st stage Lube oil Engine Exhaust gas A B Intercooler 2st stage

  16. Technical equipment Heating system

  17. Technical equipment Agitators Feeding system Heating system Digestates Storage Pumps CHP Digester 2 Digester 1

  18. Technical equipment Agitators • Submersible Agitators: Used in all installations • Possibility to change - height - orientation • 17kW -> agitate 1000 m3 • 10 min every hour • always during digester feeding • Dry substrate Agitators Used for dry substrates • straw, mais, cereals, offal flour • Low density of the substrates • < 1 g / cm3 • Destroy acumulations of solids. • 15kW similar capacities

  19. Technical equipment Gas storage membrane Biogas Feeding system Heating system Digestates Storage Pumps CHP Biogas Biogas Digester 2 Digester 1

  20. Digester´s section Technical equipment Gas storage membrane

  21. Technical equipment Pasteurization Biogas Feeding system Heating system Digestates Storage Pumps CHP Pasteurization Biogas Biogas Digester 2 Digester 1

  22. Technical equipment Pasteurization • Heat treatment (EU 1774) • avoid risk of dispersal of patogens from any animal subproduct • 70°C, 1h • Pumpable material • Two pumps are required • Tanks with heating and mixing system. • When sizing consider heating time (4 h) • Pasteurized material should not be put directly in to digester

  23. Questions? Camilo Wilches T. biogas-weser-ems GmbH &Co.KG camilo.wilches@biogas-weser-ems.de www.biogas-weser-ems.de

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