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Along with the necessitate to better utilize renewable as well as alternative energy sources, making better use of the energy source in addition to efficiency are also areas that call for more attention. To create better use of a wood energy source, cogeneration is an area of possible. Cogeneration in term of wood for heating as well as electrical generation. Many believe the future of the electrical network is less towards large scale power plants along with more towards small scale electrical generators feeding the grid. By way of generating both heat plus electricity can dramatically raise the efficiency of the amount of fuel captured from the wood. There are two main ways in which both heat and electricity can be generated for cogeneration. One of them being modern closed loop steam engines. These units are far more proficient than previous steam systems, in addition to recycle the hot water, so only a small amount of energy is required to turn that hot water back into steam to move the pistons, which in tern mover the generator to create electricity. Using modern alloys these engines use deionised water as both the lubricant in addition to working fluid. Pared up to a small pellet stove or boiler, residual heat energy from the smokestack for instance could be used to generate electricity. This electricity could then be used to power the property, as well as it not required sent into the grid.

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Gasification is the additional renewable to the closed loop steam engines. Gasification is the process of breaking down wood into its core components into a gaseous fuel called syngas. This syngas if properly filtered burns very cleanly. To generate warmth the gas can be burnt directly, or to generate heat along with electricity can be used in an standard internal incineration engine to generate both electricity along with heat. By way of a one to one ratio of syngas to air, the gas can be used to power the engine. The waste heat coming from the engine plus exhaust gases can be used to heat the property. Gasification is also gaining ground as a reliable form of clean energy construction, which again can use the current infrastructure of internal incineration engine but by way of low carbon.

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Yet for gasification cogeneration systems to work efficiently plus reliably, the units prefer a standardized energy source. Wood in its raw form is anything but consistent. Changes collection from size, density plus moisture content. All of these factors effect the gasification process. Therefore to help the gasifier work efficiently, compressing the biomass into pellets can produce a significant difference. Pellets have a much higher density, along with low moisture content. As the pellets also have a consistent size they flow well due to the gasifier reactor, dropping bridging issues. Pellet making required quite a lot of processes. Initially the wood must be reduced in size comparable to a dust. Then depending on the chosen biomass this dust may need drying. A moisture content of around 15% is required to form a high density pellet in addition to reach the required compression temperatures. Once the material is sufficiently dried, it is then metered into the pellet mill where final pellet compression takes place.

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