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Cambodia Power Generation with Stirling Engine using Rice Husk

　Small-scale biomass system using Stirling engine in Cambodia. We are aiming as electric power will be supplied to an unelectrified area and greenhouse gas (GHG) reduction will be attained by this project. The electric power supply of Cambodia is concentrated on Phnom Penh and urban areas, and the electrification rate has become 29%. In the source of electric power, import serves 42%, National Power Corporation (EDC) 15%, and an independent power industry company 31%. The district power industry company (REE) 8% of the electric power in Cambodia. Although REE is using the diesel generator, the needs for the electricity generation by biomass it is expected that the load reduction effect of the financial side and an environmental side accompanying the substitution effect of oil fuel.

The small power generation system using rice husk combustion
　The steam turbine power generation system combined with the gas engine power generation combined with the gasification furnace as the method of old electricity generation by biomass and a steam boiler has been used.
　The equipment (reactor) for gasification of the biomass and the reformer (removal of tar) of gas are [ gas engine ] needed, Moreover, steam turbine power generation was the same system as a general thermal power plant, and although it was suitable on a large scale by the system which generates the steam generated from a biomass boiler as a medium, if small, the problem to which efficiency and the cost per kWh become extremely high.
　Since the cost benefit supposing a thing with the conventional large-sized system is applied although the needs of the electricity generation by biomass in small size are great if an example is taken by the conditions of a country and the economic rationality of Cambodia, The eligibility to the needs of the country has been called for in the small electricity generation by biomass which was newly excellent in cost performance.
　The Stirling engine power generation system which is an external-combustion engine is a system made to change the heat of direct combustion of the biomass into electricity direct by expansion and the contractile action of the gas inside an engine, The equipment made to generate a pretreatment plant and steam is unnecessary, and since an initial cost can be held down, We are advancing the enterprise with the local counterpart.

The predominance point of the system by Stirling engine

1. The portability is good and the installation is easy as you expected. This is the fact that the construction period is also short and the construction cost would be low.


2. Easy care and low maintenance. The Stirling engine is external-combustion engine, there is no-care as a corrosion ingredient does not touch the engine-inside, like an internal-combustion engine.


3. Since it is not an internal-combustion engine, there is no explosion so that makes less noise.


4. From 3.5 kWh to 100 kWh, customization of an output is flexible. It corresponds also to failure peculiar to electricity generation from biomass, and a maintenance risk. It is not necessary to stop the whole also in the time of a stand breaking down, or the case of a maintenance, stable operation is attained, and an unstable risk peculiar to the biomass can be distributed. Since a unit is the same, the cost reduction of volume efficiency can be expected.