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4. Descriptions of some biomass CHP plants in Finland 4.1 Tervola 0.5 MWe/1.1 MWdh 4.1.1 Background Tervola combined heat and power plant produces electricity and district heat for the municipality of Tervola. The plant produces about 90% of the district heat and about 10% of the electric power needed by Tervola. The electric power of the Tervola plant is less than 1 MWe which was selected for lower limit of the scope of this study. The plant manufacturer Entimos Oy however aims to offer modular packages of 2 MWfuel/0,5 MWe which can be combined to each other. The Tervola power plant is supplied by a family company Entimos Oy. The gasifier is developed and patented by the Saares family and the Tervola plant is the first commercial application. Previously a pilot plant was built in 1996. The total investment in the plant was about 1.3 MEUR in 1999-2001, which gives a specific investment of 2 720 EUR/kWe for electric power. The investment decision was made in 1999 and the plant was supposed to be in operation by April 2001. However, there have been some problems with the gas cleaning before the gas engine and the start-up of continuous electric power production has delayed. More research and measurements is needed that developers can start electric power production. 4.1.2 Process description Using wood residues like bark and sawdust from sawmills as fuels, the plant produces 0.47 MW electricity and 1.13 MW district heat with an overall efficiency of 81.5%. The main components of the plant are a fuel gasifier, a gas engine with a heat recovery unit and a separate gas boiler. The gasifier is a combined counter flow/forward flow process. The dirtier product gas from the counter flow is burned in a separate gas boiler. The cleaner product gas from forward flow is cleaned in cyclones and bag filters before it is burned in a spark-ignited gas engine supplied by Jenbacher AG. The process diagram of the Tervola power plant is shown in figure 15. 27PDF Image | Small-scale biomass CHP Finland Denmark and Sweden
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