Technical Equipment for agricultural anaerobic digesters in Europe

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Technical Equipment for agricultural anaerobic
digesters in Europe
Camilo Andrés Wilches Tamayo Biogas weser ems
GmbH Co KG
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Table of contents

• Companys 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

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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 gt98 MWel
• Energy parks 8,5MWel
• International Projects

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

• Depends of the substrate
• Dry matter lt 12 pumped from tanks to the
  digesters
• Dry matter gt 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

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Technical equipment
Feeding system
Pumps
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Technical equipment Pumping system

• In general a susbtrate is pumpable when
• Dry matter lt12 , homogeneos, particle size lt
  12mm
• Pumping system
• Any possible substrate
• movement is allowed

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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 lt 0,9 bar
• Progresive cavity pump
• less maintenance time demanding
  maintenance
• high pressure (25 bar) -
• suction capacity lt 0,9 bar
• 500 kW power plant 11 kW, 50 m3/h

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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.

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Questions? (Break 5 min)
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Technical equipment
Feeding system
Heating system
CHP
Pumps
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Technical equipment Heating system

Heat requirements (625 kW biowaste) Heat up
substrate (8C to 40) 38,64 kWth Maintain
temperature digesters 170 kWth (outside
temperature -12C) Pasteurizer 70C 1 hour
80 kWth External user (green house,
industry,,,)
A
B
T 40
T 35
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Technical equipment Heating system

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

• Submersible Agitators Used in all installations
• Possibility to change - height
  - orientation
• 17kW -gt
  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
• lt 1 g / cm3
• Destroy acumulations of solids.
• 15kW
  similar capacities

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

• Digesters section

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

• Heat treatment (EU 1774)
• avoid risk of dispersal of patogens from any
  animal subproduct
• 70C, 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

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Questions? Camilo Wilches
T. biogas-weser-ems GmbH Co.KG camilo.wilches_at_bio
gas-weser-ems.de www.biogas-weser-ems.de