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REHAU SOLUTIONS FOR ANAEROBIC DIGESTION PLANTSRENEWABLE AND SUSTAINABLE ENERGY PRODUCTION
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REHAU SOLUTIONS FOR ANAEROBIC DIGESTION PLANTSINTRODUCTION
Anaerobic Digestion (AD), also known as biogas, is the process of converting organic matter into methane, which then can be used for electricity and heat generation. It is becoming increasingly popular in the UK due to the large potential of carbon savings for both heat and power.
A typical farm based AD plant would comprise of the following steps:
1 - Animal waste is collected and transferred into a
large digester
2 - The digester is heated to around 40-50°C to
speed up production of methane by
methanogenic bacteria
3 - The methane is collected from the tank using
a gas hood and is piped into a CHP unit
(combined heat and power plant)
4 - The CHP unit produces electricity from the
methane which is either sold back onto the grid
or used on-site
5 - Excess heat from electricity production is fed
fi rstly back into the digester
6 - The rest of the surplas heat can then be used
for district heating scheme
7 - The remaining organic matter (digestate) can
afterwards be used as a nutrient rich fertiliser
In theory, anything organic can be feed into a
digester but the most common feedstocks are
animal manure, food waste, unused crops / grass
or abattoir waste.
REHAU SOLUTIONS FOR ANAEROBIC DIGESTION PLANTSDISTRICT HEATING
District heating (DH) is the process of centrally producing heat and distributing the heat via a heat network for space heating and hot water requirements. In some Scandinavian countries, over 50% of their heat is distributed via district heating schemes.
The benefi ts of district heating are increased
dramatically by using a combined heat & power
plant (CHP), which produces not only heat, but also
electricity (see graphic above). CHP plants can be
powered by fossil fuels but are increasingly being
with biomass or anaerobic digestion projects.
Advantages of a DH scheme with on-site CHP plant:
- Signifi cantly improve energy effi ciency, leading to
high carbon savings
- Maximises benefi ts of renewable energy sources
such as biogas
- Reduce maintenance costs by having one central
plant
- CHP provides cost savings of between 15-40%
compared to traditional heat only methods
RAUTHERMEX T-Shroud
Large coils of RAUTHERMEX
“The combination of cogeneration (CHP) and district heating is regarded by many experts as one of most effi cent methods of carbon reductions”
REHAU SOLUTIONS FOR ANAEROBIC DIGESTION PLANTSRAUBIO DIGESTER HEATING
The RAUBIO digester heating system off ers a one material solution, for the pipe and pipe fi xing elements.
The RAUBIO cross-linked polyethylene (PE-Xa) pipe
was developed for the demanding environment
within a digester and off ers the following advan-
tages:
- Fast and simple installation
- No microbiological corrosion
- High acid & temperature durability
- No connections in digester necessary
- No clogging due to smooth pipe outer surface
- Simple corrosion-free attachment
The RAUBIO range includes all the fi xing elements
and accessories needed (such as tools and grout)
to attach the RAUBIO pipes to the digester wall.
The multi seal fl ange (pictured) allows air- and
water-tight pipe connections through the digester
wall and stainless steel manifolds are available to
connect all the RAUBIO pipes externally.
REHAU have calculation software to help size up
the amount of pipe runs needed for each specifi c
project. Please contact your local REHAU sales
offi ce for further information.
RAUBIO fi x
RAUBIO Sealing Flange
REHAU SOLUTIONS FOR ANAEROBIC DIGESTION PLANTSRAUBIO GAS CONDENSATION COLLECTION CHAMBER
REHAU’s new gas condensation collection chamber off ers a solution to collect biogas condensate that combines easy site handling and reliable construction. The solution was specifi -cally designed for the demanding requirements of an anaerobic digestion plant. The chamber off ers maximum safety, a 100 year lifespan and is fully leak-proof.
Advantages at a glance:
– Integrated condensate separation with optional
cut-off function for pressure testing
– Corrosion and chemical resistance due to
polypropylene (PP) material
– No leaks thanks to the safety sealing
system with load decoupled seals
– Simple connection using electrofusion couplers
– Easy construction site handling with no lifting
gear thanks to modular system
– Simply to inspect with GRP corrosion resistant
steps and the light colour
– Can take loads up to SLW 60 (10 ton wheel load)
Internal view of chamber
External view of chamber
REHAU SOLUTIONS FOR ANAEROBIC DIGESTION PLANTSRAUTHERMEX PRE-INSULATED PIPE
RAUTHERMEX pipe systems make a signifi cant contribution to the economy of district heating systems, because they are easy to install, safe to use and require low maintenance.
The UNO and DUO variants feature single or twin
carrier pipes, respectively, made of cross-linked
polyethylene (PE-Xa) with an oxygen-barrier layer.
The pipe sizes range from 25mm up to 160mm for
UNO pipes and from 25mm up to 63mm for DUO
pipes.
RAUTHERMEX provides the following advantages:
- Optimum heat insulation, remaining water-tight
even if the LDPE outer jacket is damaged
- Suitable for temperatures up to 95oC and
pressure up to 6 bar, therefore ideal for modern,
low-temperature systems
- Longitudinally stable pipe – when laid under
ground the pipe does not expand along its
length, unlike open cell insulated pipes
- Lengths up to 560m possible, allowing for
simplifi ed design and installation
- Uses REHAU EVERLOC compression sleeve
technology to provide leakproof joints with
minimal bore reduction
- High thermal insulation from universal shroud
system, no hot works required
Bending radius of RAUTHERMEX
RAUTHERMEX shroud options
REHAU SOLUTIONS FOR ANAEROBIC DIGESTION PLANTSRAUVITHERM PRE-INSULATED PIPE
RAUVITHERM combines the key advantages of high fl exibility with high thermal insulating properties.
RAUVITHERM is a pre-insulated PE-Xa pipe with
open cell cross-linked PE insulation and a robust
HDPE outer jacket. The outer layer of insulation is
bonded to the HDPE outer jacket to prevent water
ingress which would otherwise aff ect the thermal
properties of the pipe.
RAUVITHERM is available in single pipe (UNO)
25mm to 125mm and twin pipe (DUO) 25mm to
63mm, with a comprehensive range of fi ttings and
accessories.
Benefi ts at a glance:
- Greater fl exibility due to corrugated outer
sleeve and open cell insulation, allowing a tight
bending radius
- Robust HDPE outer sleeve to cope with tough
on-site conditions
- Long lengths up to 350m possible, reducing
number of joints needed for long pipe runs
- High insulation performance from several layers
of insulation and the low thermal conductivity of
the insulation
- Bonded outer layer of the insulation prevents
water ingress even if the outer jacket is
punctured. This ensures high insulation
performance
- Uses renowned EVERLOC leak-proof fi ttings
and tools RAUVITHERM connection in trench
RAUVITHERM shroud options
www.rehau.co.uk 12.2010/JP
RAUGEO PE-Xa Probes RAUGEO PE-RC & PE 100 Probes AWADUKT Thermo ground-air heat exchanger
REHAU Underfl oor Heating & Cooling REHAU Underfl oor Heating Controls AWADUKT PP SN10 sewer pipe
REHAU PRODUCT RANGEOTHER SYSTEMS AND ACCESSORIES
UK & IRELAND SALES OFFICES
London, REHAU Ltd, The Building Centre, 25 Store Street, London WC1E 7BT Slough, Units 5 J & K, Langley Business Centre, Station Road, Langley, Slough SL3 8DS Phone: 01753 588500 Fax: 01753 588501 Manchester, Brinell Drive, Irlam, Manchester M44 5BL Phone: 0161 777 7400 Fax: 0161 777 7401 Glasgow, Phoenix House, Phoenix Crescent, Strathclyde Business Park, Bellshill, North Lanarkshire ML4 3NJ Phone: 01698 503700 Fax: 01698 503701 Dublin, 9 St. Johns Court, Business Park, Swords Road, Santry, Dublin 9 Phone: 00353 (0)1 8165020 Fax: 00353 (0)1 8165021