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Chapter 4 Thermodynamic analysis at the moment, but it is interesting to analyse the effects of feeding the power plants with syngas at 500°C (the gasifier exit temperature) without the necessity of cooling it (in this case, biomass drying is effected adopting ICE or GT exhaust gases). Summarising, three versions of the gasification device have been analysed (for brevity reasons, the corresponding plant schemes are not graphically shown: indeed, all the configurations are very simple to figure): 1. use of the hot air exiting the dryer to feed the gasifier (pre-heat); 2. thermal heat recovery of the residual air mass flow rate in addition to the previous operation (pre-heat + heat recovery); 3. high-temperature syngas cleaning and plant feeding (hot feeding). The analysis has been conducted on three plant samples: ambient pressure gasifier coupled with an internal combustion engine (ICE GAS) and ambient pressure or pressurised gasifier coupled with a gas turbine, signally the regenerative one, as it has proved to be the most performing one (GT GAS REG AMB and GT GAS REG PRES). Obviously results can then be transferred to the other solutions adopting this type of devices (i.e. simple and STIG cycle GT GAS and the combined plants ICE/GT GAS ORC). The reference size is 100 kWel: also in this case results are qualitatively valid for the other scales too. Results, always expressed in terms of electrical and first law efficiencies, are then listed in Table 4.9 and shown in Figures 4.27 and 4.28. The base case version is obviously referred to the configuration described in Section 4.3.1. Solution ICE GAS GT GAS REG AMB GT GAS REG PRES Version Base case Pre-heat Pre-heat + heat recovery Hot feeding Base case Pre-heat Pre-heat + heat recovery Hot feeding Base case Pre-heat Pre-heat + heat recovery Hot feeding ηel [%] 23.78 24.45 24.45 28.35 19.07 19.84 19.68 16.62 22.15 22.17 22.07 25.08 ηI [%] 73.42 75.45 78.65 81.46 63.92 65.68 68.95 66.54 66.68 68.39 71.05 72.32 166 Table 4.9 – Improved gasification solutions: electrical and first law efficiencies.PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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