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What Is A Biogas Generator?

biogas generator is one of the best, most cost effective, & environmentally sustainable ways to generate power for household consumption. It works by breaking down biomass (plant based material, like vegetables, wood, or animal based material), organic waste, manure, sewage, and other green waste through a process called anaerobic digestion.

Biogas can also be produced through another process called fermentation. Now the breakdown of the biodegradable organic material takes places in a biogas digester tank. This process produces biogas which is then used as the biofuel to generate power for cooking, heating, lights, electronics, and even for transportation purposes.

As a word of caution, don’t try to use processed, non organic foods as the source of biogas fuel, and stay away from using things like rotting meat or dead fish. Instead stick to plant based organic matter and vegetables to get the most out of your biofuel electric generator.

via DIY Biogas Generators for Cheap Home Energy: Pros & Cons

arious technologies to generate electricity from biogas on a household level are available. In principle, the chemical energy of the combustible gases is converted to mechanical energy in a controlled combustion system by a heat engine. This mechanical energy then activates a generator to produce electrical power. The most common heat engines used in for biogas energy conversion are gas turbines and combustion engines. Combustion engines can be either internal combustion engine (e.g. reciprocating engine) or external combustion engine (e.g. Stirling engine).

For small-size heat engines, combustion engines are popular as they are more efficient and less expensive than small gas turbines. However, gas turbines may be more efficient when operating in a cogeneration cycle producing heat and electricity. Cogeneration or combined heat and power (CHP) describe the simultaneous generation of both electricity and useful heat. Heat engines (also thermal power plants) in general do not convert all of their thermal energy into electricity. In most cases, a bit more than half is lost as excess heat. By capturing the excess heat, CHP use heat that would be wasted in a conventional power plant, potentially reaching an efficiency of up to 89%, compared with 55% for the best conventional plants (WRAPAI 2009). This means that less fuel needs to be consumed to produce the same amount of useful energy. By-product heat at moderate temperatures (100-180°C) can also be used in absorption chillers for cooling (WRAPAI 2009). A plant producing electricity, heat and cold is sometimes called trigeneration or more generally a polygeneration plant.

 GTZ Ecosan

Micro cogeneration is a so-called distributed energy resource (DER). Biogas is burned for running a generator (e.g. micro turbine). The installation is usually less than 5 kWe (Kilowatts-electrical, WRAPAI 2009). Instead of burning fuel to merely heat space or water, some of the energy is converted to electricity in addition to heat. This electricity can be used within the home or business or, if permitted by the grid management, sold back into the electric power grid (WIKIPEDIA 2010).

Mini cogeneration is a DER producing usually more than 5 kWe and less than 500 kWe (WRAPAI 2009) and the excess energy is generally fed into the electricity grid. To be viable a good base load for electrical demand and heat demand must exist (WIKIPEDIA 2010).

Current Micro- and Mini CHP installations use five different technologies: micro turbinesinternal combustion enginesexternal combustion engines (stirling engines), steam engines and fuel cells.

Biogas systems are an environmental friendly way of energy production and have a positive impact on climate change. In fact, the contribution of a methane molecule (CH4) to the greenhouse effect is 21 times greater than that of a carbon dioxide molecule (SUSANA 2009). Therefore burning methane, even though producing CO2, reduces its impact on the environment. via Biogas Electricity (Small-scale) | SSWM