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

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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