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The predicted electric efficiency varies between 27-36% depending on the fuel moisture contents and the engine performance. The total efficiency is predicted to be above 85%. Economic Evaluation The total investment of the plant amounts to 5 M€, and the electric efficiency was assumed to be 31% ((27+36)/2). Using this along with the techno-economic data presented by Hannula [48], Table 3.7 is achieved. The COE was calculated to 87 €/MWhel, see Appendix D for details. It should be pointed out the price for heat sales are fixed to zero in calculations, this will result in a higher COE since the full capital cost will be added as a cost on the electricity side. Table 3.7 Economic analysis of the Kokemäki plant Electric efficiency Fuel input Investment Service lifetime Discount rate Annual operation hours Annuity Labor cost Other fixed costs Other various costs Feedstock price Total annual cost COE 3.3.3. €/a [%] 31 - [MW] 7.2 - [M€] 5 - [Years] 20 - [%] 5 - - 6000 - Scale factor 0.333 0.138 - - - - - - [€/MWhfuel] 2 [€/MWh] 10 [€/a] - [€/MWhel] 87 Summary Gas Engines 401213 68292 173639 86400 432000 1161544 The gas engine could at present be considered semi-commercial, and the first wave of engine based plants has been presented in this chapter. This technology has a COE in the span of 53- 87 €/MWhel, which is very low compared to the other technologies regarded in this study. However the technology is complex and often demands high fuel qualities. Some of the plants gasifiers have problems with low part-load efficiencies, which make them unsuitable for delivering district heating. Nevertheless with a constant heat sink or upgraded gasifiers technology this technology shows promising prospects for the future. 50PDF Image | Biomass Based Small Scale Combined Heat and Power Tech
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