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BioGas From Cow Dung
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Cow dung is used in many developing countries for generating energy. It has a lot of potential to reduce carbon footprint. By capturing and storing CO2 from biogas into the ground, the biogas becomes carbon negative and scrubs our past CO2 emissions out of the atmosphere.
Process of Converting Cow dung to Power:
All the collected cow dung is fed into an anaerobic digester.Anaerobic Digester:The digester is built to hold 21 days of farm waste at roughly 100o. Bacteria convert the waste into various products, one of which is methane gas. Gas produced by the bacteria builds up the pressure in the concrete vessel, and a pipe delivers the biogas to a modified natural gas engine.
The Generator:The biogas fuels the engine, which in turn spins an electric generator to create electricity. Waste heat from the engine is used to keep the digester warm and offsets fuel purchase on the farm.
Electricity: One cow's waste can produce enough electricity to light two 100-watt light bulbs for 24 hours a day. The energy is fed onto the electrical system for distribution to customers.
Dry Solid Waste:Digested Manure is processed through a mechanical seperator. The odourless solids can be used to replace sawdust or sand as bedding for the animals. Solids not used for bedding may be further processed and sold to public.
The facts about biogas from cow dung:
Cow dung gas is 55-65% methane, 30-35% carbon dioxide, with some hydrogen, nitrogen and other traces. Its heating value is around 600 B.T.U. per cubic foot.
Cow dung slurry is composed of 1.8-2.4% nitrogen (N2), 1.0-1.2% phosphorus (P2O5), 0.6-0.8% potassium (K2O) and 50-75% organic humus.
About one cubic foot of gas may be generated from one pound of cow manure at around 28°C. This is enough gas to cook a day’s meals for 4-6 people in India.
About 1.7 cubic metres of biogas equals one litre of gasoline. The manure produced by one cow in one year can be converted to methane, which is the equivalent of over 200 litres of gasoline.
Gas engines require about 0.5 m3 of methane per horsepower per hour. Some care must be taken with the lubrication of engines using solely biogas due to the “dry” nature of the fuel and some residual hydrogen sulphide, otherwise these are a simple conversion of a gasoline engine.
One of the world’s largest biogas plants is currently being built in North West Jutland, in one of Denmark’s most important agricultural areas. Due for completion in 2012, Maabjerg Bioenergy will convert 500,000 tons of biomass into pure energy. The big plant is a co-operation between agriculture, local government and district heat stations and will purify livestock manure, while at the same time produce heat and electricity to the nearby cities of Holstebro and Struer.
The main functions of this plant are:
i To collect the gas for processing and storageii To regularly stir and mix the charge.Iii To accept new quantities of chargeiv To keep the charge at operating temperaturev To provide a means to discharge the spent contentsvi To allow access for repairs and maintenance
Contact Us• Mr. DharmendarKumar (Operation Manager)
No. 1, Surya Prakasam street, Krishnapuram, Next to Corporation Bank, Ambattur, Chennai - 600053. Tamil Nadu, India
• Mobile: (91)-9994266616/+(91)-9841908345• Telephone :+(91)-(44)-42043266• E-mail:[email protected]• http://cryogenicprocesscontrol.com/BIO-gas-from-co
w-dung.html
