Agricultural Agricultural Agricultural Biogas Biogas Creation

The farming industry offers a range Biogas is a renewable fuel that is Biogas of potential applications for created by the anaerobic agricultural biogas systems. Arable decomposition of biodegradable land can be used to grow crops organic materials. As a metabolic Clarke Energy is the authorised distributor and service which are fed into dedicated product of the participating partner for GE Energy’s division in a growing digestion systems. Alternatively methanogens and acidogenic number of countries across the world. In addition to waste products from the farm can bacteria, the prerequisites for its providing high-efficiency, reliable gas engines we combine be harnessed to provide renewable production are a lack of oxygen, a energy. Agricultural digestion pH value from 6.5 to 7.5 and a this with the expertise and resources to deliver unbeatable systems are typically sized between constant temperature of 35-45 °C product support. 0.5 and 3.0MW electrical output. (mesophillic) or 45-55 °C The heat produced by the engines is (thermophilic). The digestion period Whether your requirement is for the supply of a single gas typically used in a / or retention time is typically between engine generator or a complete turnkey power generation combined heat and power (CHP) 10 and 30 days depending upon the facility, we can meet that need. Our ability to add value by configuration with heat from the type of digestion employed. The engine cooling systems used to anaerobic digestion systems of offering an end-to-end service, from initial proposal to warm the digesters and pasteurise today operate largely within the reliable long-term maintenance, has led to us becoming a input materials. Additional heat is mesophilic temperature range. multi-national company with operations in ten countries available from the engines to be across the globe. Our company prides itself on integrity, used for local heat users such as Typical Component Composition (by volume) delivering only the highest quality products whilst providing grain driers or for district heating. a reliable accountable localised service. Methane (C H4) 50-65%

Benefits of Agricultural Biogas Carbon dioxide (CO 2) 50-35% Benefits of working with Clarke Energy Clarke Energy provides flexible solutions for your gas Water vapour saturated generation projects. Our services range from the supply of — Production of renewable power a gas engine generator, through to the complete turnkey — Avoidance of greenhouse gas emissions installation of a gas powered generation facility. Clarke Energy — Disposal of waste has a dedicated, top-quality team of sales, , — Economical onsite power and project management, commissioning and maintenance staff reduced transmission losses to meet your needs. We also offer long-term maintenance — Production of soil improver contracts backed up by a strong balance sheet, giving — Cost effective, proven peace of mind with respect to the long-term performance technology — Helps isolate farmer from crop of your GE gas generation equipment. price fluctuations

Agricultural Biogas Schematic

Exhaust gas Barfoots of Botley, Bognor Regis, UK, 1x JGMC320 Biogas

Gasometer Heat Digester exchanger Heat Gas flare consumer

Biogas Electrical Raw fertilizer for energy agricultural use

Hygenisation

Primary pit Digester Feedstock Conversion Steps from GE and Our Competence Feedstock to Power Agricultural Biogas

Agricultural biogas plants utilise The process of biogas generation is The broad range of GE Jenbacher Clarke Energy has extensive organic materials found on farms to divided into for steps: biogas engines are specifically experience in the engineering, generate biogas, a source of designed to run at full load with high installation and maintenance of . The plant may be 1. Preparation of the input material efficiency and high availability, generation facilities operating on designed to accept energy crops including removal of physical despite a low heating value and gas derived from biological sources. that have been grown specifically to contaminants, practical size fluctuating gas quality and pressure. input into the digestion facility. reduction & pasteurisation of The high quality and specially The GE Jenbacher gas engine is These crops are typically ensilaged wastes designed engine parts resist the known for having the highest levels and stored in clamps or hoppers 2. Digestion (fermentation), impurities that usually appear in of electrical efficiency on the market. and are continuously fed into the consisting of hydrolysis, biogas and similar types of fuel. When coupled with a contractual digester throughout the year. Energy acetogenesis, acidogenesis and maintenance agreement with Clarke crops for biogas production can methanogenesis Before the biogas can be fed into Energy, it will give peace of mind to include: 3. Conversion of the biogas to the gas engines, it needs to be dried the customer that they will achieve — Maize renewable electricity and useful and compressed. Severe the highest levels availability and — Grass heat contaminants such as sulphur hence consistent returns from their — Wheat 4. Post treatment of the digestate should be removed if exceeding biogas plant. — Rye guideline concentrations. Not only — Triticale Initially the feedstock to the will these measures considerably digesters is received in a primary pit increase the availability of the An approximate rule of thumb is that or liquid storage tank. From here it is generator, but they will also reduce for 1acre (0.405 hectares) of whole loaded into the digester by various the costs associated with operation. crop maize will produce enough gas different means depending upon the to generate 1kW of electrical power. constitution of input materials. Please request a fuel gas quality specification to understand Alternatively other organic materials In the digestion tanks a series of operational limits for gas such as waste products may be biological processes are harnessed contaminants in the generator’s fuel. used including: in order to produce biogas. Hydrolysis — Slurry is the process where the organic Agricultural biogas plants typically — Manure material is solubilised into the generate returns via the sale of — Vegetable waste digestion liquid. It then undergoes the electricity alone, gate fees as a — Glycerol – from biodiesel intermediate steps of acidogenesis charge for the acceptance of waste manufacture and acetogenesis which create the materials may be low or non-existent. precursor molecules for This means that the gas engine is of methanogenesis. Methanogens feed particular importance for the off these precursors and produce success of the plant. If the farmer methane as a cellular waste product. grows energy crops to feed into the plant then there is a cost associated The biogas containing this with producing the feedstock. These biologically-derived methane is two factors make it essential for the contained and captured in a gas farmer to have an engine with the storage tank which is located maximum levels of availability separately to the main digester, or (running time per year) and the alternatively can form its roof. The highest levels of electrical efficiency, gas storage tank acts as a buffer in in order to convert the gas to the order to balance fluctuations in the maximum level of electrical output

Approximate electrical output production of gas in the digesters. and hence financial return. per 1,000 tonnes per annum, fresh weight input material Typically an agricultural biogas plant

Electrical output kW will consist of two or more tanks 0 50 100 150 200 250 300 topped with a twin-skinned gas- holding roof. The majority of biogas Stoke Bardolf, UK, 2 x JGMC320 Cow manure will be produced by the first digestion tank with a lower gas yield Pig manure being attained in the secondary digestate storage tank.

Grass silage

Chicken litter

Maize silage, whole crop

Rye silage, whole crop

Triticale silage, whole crop

Grain (rye/wheat), ground

Glycerol If you would like to find out more about how Clarke Energy can help you develop your agricultural biogas project, please contact your local office for more details.

Algeria

28 rue des Tourelles Unit 7 Wilaya - Hydra Newtown Business Park Alger Newtownmountkennedy County Wicklow Tel. +213 21 69 42 52 Ireland Fax. +213 21 69 42 52 Tel. +353 (0)1281 0 010 [email protected] Fax. +353 (0)1281 0520 [email protected]

Australia Building 1 2-4 Stirling Street Unit 5 Thebarton 56 Pavilion Drive South Airpark II Adelaide 50 31 Mangere Australia Auckland 2022 Tel. +61(0)8 8290 2100 New Zealand Fax. +61(0)8 8443 5848 Tel. +64 (9) 256 9 910 [email protected] Fax. +64 (9) 256 9 912 [email protected]

China No. 1906 Tower A Chaowai SOHO 13B Obanta Road 6B Chaowai Dajie Apapa Chaoyang District Lagos Beijing 100020 Nigeria China Tel. +234 (0)181 567 23 Tel. +86 (010) 5900 05 61 [email protected] Fax. +86 (010) 5900 0562 [email protected]

France Tunis Business Centre Immeuble Sarra Z. A. de la Malle Boulevard Principal RD6 Les berges du lac Bouc Bel Air 13320 1053 Tunis Tunisia Tel. +33 (0)4 42 90 75 75 Tel. +216 71 965 425 Fax. +33 (0)4 42 90 75 76 Fax. +216 71 965 423 [email protected] [email protected]

India UK Head Office

Shivkiran, Plot No. 160 Power House CTS No. 632 Senator Point Lane No.4 South Boundary Road Dahanukar Colony Knowsley Industrial Park Kothrud Liverpool L33 7RR Pune 411038 Tel. +44 (0 )151 546 4446 Tel. +91 20 302 41777 Fax. +44 (0 )151 546 4447 Fax. +91 20 302 41800 [email protected] [email protected]