Technical Equipment for agricultural anaerobic digesters in Europe

Technical Equipment for Technical Equipment for agricultural anaerobic agricultural anaerobic

digesters in Europedigesters in Europe

Camilo Andrés Wilches TamayoBiogas weser ems GmbH & Co KG

Technical Equipment for agricultural anaerobic digesters in Europe

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


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

The company


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“


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


CHP

Biogas

Digester 1

Digestates Storage

Digester 2

Pumps

Feeding system

Biogas Biogas

Technical equipment

Heating system


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 digestersConfigurations: Walking floor : corn, cereals

(size 20-120 m³)

Mixer feeder: straw(size 8 -80m3) manure + straw

paste materials (powder) liquid producing materials

Technical equipment Feeding system


Pumps

Feeding system

Technical equipment


In general a susbtrate is pumpable when: Dry matter <12 %, homogeneos, particle size < 12mm

Pumping system:Any possible substratemovement is allowed

Technical equipment Pumping system


Most of the pumps used are Positive Displacement PumpsPumps 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

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.

Technical equipment Pumps


Questions?

(Break 5 min)


CHPPumps

Feeding system

Heating system

Technical equipment


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,,,)

Energy Flow gas motor 625 kWel

P th Exhaust gas

P th hot water

P th losses

P el

A

B

T= 40° T= 35°

B AIntercooler1st stage

Lube oil Engine Exhaust gas

Intercooler 2st stage


Technical equipment Heating system


CHP

Digester 1Digester 2

Pumps

Feeding system

Heating systemDigestates Storage

Technical equipment Agitators


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


CHP

Biogas

Digester 1

Digestates Storage

Digester 2

Pumps

Feeding system

Biogas Biogas

Technical equipment Gas storage membrane

Heating system


Digester´s section

Technical equipment Gas storage membrane


CHP

Biogas

Digester 1

Digestates Storage

Digester 2

Pumps

Feeding system

Biogas Biogas

Technical equipment Pasteurization

Heating system

PasteurizationPasteurization


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


Questions?

Camilo Wilches T.biogas-weser-ems GmbH &Co.KG

[email protected]

Documents

Technical Equipment for agricultural anaerobic digesters in Europe