Biogas plant Venaria Reale (I) Reference Plant. Customer. Plant data. Commissioned: La Bellotta Soc. Semplice Agricola (I)

Transcription

1 Biogas plant Venaria Reale (I) Customer La Bellotta Soc. Semplice Agricola (I) Commissioned: 2010 Input: Maize silage, Triticale silage Power electric: 999 kw

2 Plant design and process The input material is stored in silage clamps to prevent any premature aerobic reaction. The material is compressed and covered. This minimises the energy loss as well as odour emissions. The incoming liquid input is stored in two preliminary pits. These pits also serve to capture surface water and drainage water from the silage clamps which is pumped into the digester. The feeding of the main digester is done through a special Thöni feeding unit for solid matters (consisting of a container module and automated conveyor system). The storage capacity of a feeding unit is 117 m³. The loading of the container module has to be done by a wheel loader. The digesters are designed as round vessels made from reinforced concrete with a gas storage unit. Sufficient insulation and integrated heating systems ensure optimal conditions for the generation of biogas from the input substrates. The homogenisation of the material in the digesters is effected by means of slow turning Thöni paddle mixers and by fast turning propeller mixers. The mixers also help to prevent the formation of floating layers and sediment deposits, and at the same time they help the biogas to escape. After the fermentation process a separation unit separates the fermentation residue (digestate) into a solid and a liquid part. The liquid part is pumped into the final storage unit and can be spread on the fields as high quality fertiliser. The remaining solids are almost odorless and also have very good fertilising properties. Before the biogas passes to the CHP power plant, it is treated in an external desulphurisation system. After the biogas is desulphurised, it is introduced to the cogeneration plant where it will be converted into electrical and thermal energy. The electricity shall be fed to the local supply network. Power electric: 999 kw Storage pit/liquids: 2 88 m³ Loading unit/solids: m³ Digester: Reinforced concrete m³ Gas storage: Double membrane m³ Paddle mixer: 3 Main digester 2 Secondary digester Propeller mixer: 1 Main digester Shaft mixer: Gas cleaning: External scrubber, Thöni Sulf Minus System CHP power plant: GE Jenbacher Subject to error and misprints Copyright Thöni Industriebetriebe GmbH 2012

3 Biogas plant Medicina (I) Customer Società Agricola Cazzani Medicina (I) Commissioned: 2008 (1,4,MW), 2010 (+ 1,4 MW) Input: Feedstock, Agricultural by-products Power electric: kw

4 Plant design and process The input material is stored in silage clamps. In order to prevent any premature degradation, the material is compressed and covered. This minimises the energy loss as well as odour emissions. A reception pit is provided as storage tank for the incoming liquid input material. This pit also serves to capture surface water and drainage water from the silage clamps which is continuously pumped into the digesters. The feeding of the digesters is achieved by a special Thöni feeding unit for solid matters (consisting of a container module and automated conveyor system). The storage capacity of a feeding unit is approx. 100 m³. The loading of the container module has to be done by a wheel loader. The digesters are designed as round vessels made from reinforced concrete with a gas storage unit on top. Sufficient insulation and integrated heating systems ensure optimal conditions for the generation of biogas from the input feedstock. The homogenisation of the material in the digesters is achieved by means of slow turning Thöni paddle mixers and by fast turning propeller mixers. The mixers also help to prevent the formation of floating layers and sedimentation, and at the same time they help the biogas to escape from the substrate. After the fermentation process a separator unit separates the fermentation residue (digestate) into a solid and a liquid phase. The liquid part is pumped into the final storage unit and can be spread onto agricultural land as a high quality fertiliser. The remaining solids are almost odorless and also have very good fertilising properties. Before the biogas passes to the two CHP units, it is treated in an external desulphurisation unit to clean it from H 2 S. After the biogas has been desulphurised, it is burnt in the cogeneration plants and thus converted into electrical and thermal energy. The electricity is fed into the local power grit, while the heat is partially utilised to maintain the fermentation process and also used within a district heating network. Power electric: kw Storage pit/liquids: 2 75 m³ Loading unit/solids: m³ Digester: Reinforced concrete m³ m³ Gas storage: Double membrane m³ m³ Paddle mixer: 2 Digester 1 2 Digester 2 Propeller mixer: 1 Digester 1 1 Digester 2 Shaft mixer: 1 Digester 1 1 Digester 2 3 Secondary digester Gas cleaning: External scrubber, Thöni Sulf Minus System CHP power plant: 2 GE Jenbacher Subject to error and misprints Copyright Thöni Industriebetriebe GmbH 2012

5 Biogas plant Suffolk (UK) Customer Agrigen Ltd. (UK) Commissioned: 2011 (500 kw), December 2012 (extension to 2,5 MW) Input: Maize silage, Agricultural by-products Power electric: 2,5 MW

6 Plant design and process The input material is stored in silage clamps. In order to prevent any premature degradation, the material is compressed and covered. This minimises the energy loss as well as odour emissions. A reception pit is provided as storage tank for the incoming liquid input material. This pit also serves to capture surface water and drainage water from the silage clamps which is continuously pumped into the digester. The feeding of the digesters is achieved by a special Thöni feeding unit for solid matters (consisting of a container module and automated conveyor system). The loading of the container module has to be done by a wheel loader. The digesters are designed as round vessels made from reinforced concrete with gas storage unit on top. Sufficient insulation and integrated heating systems ensure optimal conditions for the generation of biogas from the input feedstock. The homogenisation of the material in the digesters is achieved by means of slow turning Thöni paddle mixers and by fast turning propeller mixers. The mixers also help to prevent the formation of floating layers and sediment deposits, and at the same time they help the biogas to escape from the substrate. After the fermentation process a separation unit separates the fermentation residue (digestate) into a solid and a liquid phase. The liquid part is pumped into the final storage unit and can be spread onto agricultural lands as high quality fertiliser. The remaining solids are almost odorless and also have very good fertilising properties. Before the biogas passes to the CHP unit, it is desulphurised directly in the digester via air metering and further treated in an external desulphurization unit to clean it from H2S which would ruin the CHP if the content exceeds a certain limit. After the biogas is desulphurised, it is burnt in the cogeneration plant and thus converted into electrical and thermal energy. The electricity is fed into the local power grid, while the heat is partially utilised to maintain the fermentation process and also used within a district heating network. Power electric: 2,5 MW Storage pit/liquids: m³ Underground concrete vessel Loading unit/solids: m³ Digester: Reinforced concrete m³ m³ Gas storage: Double membrane m³ Paddle mixer: 3 Digester 1 3 Digester 2 3 Secondary digester Propeller mixer: 1 Digester 1 Gas cleaning: External biological scrubber CHP power plant: MWM Subject to error and misprints Copyright Thöni Industriebetriebe GmbH 2012

7 Biogas plant Cavenaggo d Adda (I) Customer Zerbaglia (I) Commissioned: 2011 Input: Maize silage, Triticale silage, Percolates Power electric: 999 kw

8 Plant design and process The input material is stored in silage clamps. In order to prevent any premature aerobic reaction the material is compressed and covered. This minimises the energy loss as well as odour emissions. The incoming liquid input is stored in two preliminary pits. These pits also serve to capture surface water and drainage water from the silage clamps which is pumped into the digester. The feeding of the main digester is done through a special Thöni feeding unit for solid matters (consisting of a container module and automated conveyor system). The storage capacity of a feeding unit is approx. 100 m³. The loading of the container module has to be done by a wheel loader. The digesters are designed as round vessels made from reinforced concrete with gas storage. Sufficient insulation and integrated heating systems ensure optimal conditions for the generation of biogas from the input substrates. The homogenisation of the material in the digesters is effected by means of slow turning Thöni paddle mixers and by fast turning propeller mixers. The mixers also help to prevent the formation of floating layers and sediment deposits, and at the same time they help the biogas to escape. After the fermentation process a separator unit separates the fermentation residue (digestate) into a solid and a liquid part. A part of the liquid is recirculated in the digesters, the remaining part is pumped into the final storage unit and can be spread on the fields as high quality fertiliser. The remaining solids are almost odorless and also have very good fertilising properties. Before the biogas passes to the CHP power plant, it is treated in an external desulphurisation system. After the biogas is desulphurised, it is introduced to the cogeneration plant where it will be converted into electrical and thermal energy. The electricity shall be fed to the local supply network. Power electric: 999 kw Storage pit/liquids: 1 88 m³ Loading unit/solids: m³ Digester: Reinforced concrete m³ Gas storage: Double membrane m³ Paddle mixer: 3 Main digester 2 Secondary digester Propeller mixer: 1 Main digester Shaft mixer: Gas cleaning: External biological scrubber CHP power plant: GE Jenbacher Subject to error and misprints Copyright Thöni Industriebetriebe GmbH 2012