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Chapter 4 Thermodynamic analysis temperature at the compressor inlet, that is 500°C: this value makes compression work raise dramatically so that power absorbed by the compressor is about half of the total gas turbine output, thus completely nullifying the benefits of high temperature injection in the combustion chamber5. In all of the three cases, thermal power output decreases, as syngas thermal heat recovery is no more effected and, additionally, hot gases are used to dry biomass, but thermal efficiency remains almost constant, always thanks to the fact that also fuel power input decreases. Therefore first law efficiency varies according to the electrical one, raising in case of ICE GAS and GT GAS PRES and diminishing in case of GT GAS PRES AMB. Concluding, neglecting the last particular case of fuelling plants with hot syngas, it has been demonstrated how an optimised gasifier configuration, consisting in recovery of sensible heat from syngas aiming at feeding the gasifier with hot air and performing additional heat recovery (apart the already considered biomass drying), generally leads to higher electrical and first law efficiencies. Therefore this scheme will be taken as reference hereinafter. 4.5 Conclusions The performance analysis described in this chapter has shown that, from a thermodynamic point of view, the most interesting solutions for the exploitation of biomass for power production are: • internal combustion engine coupled with a gasifier (ICE GAS); • regenerative-cycle gas turbine coupled with a pressurised gasifier (GT GAS REG PRES); • externally fired gas turbine with a ceramic heat exchanger (GT EXT CER); • internal combustion engine coupled with a gasifier and bottoming ORC (ICE GAS ORC); 5 In this sense it must be also specified that the compressor exit temperature would be up to 1000°C, which would make this solution technically unfeasible as a matter of fact, apart from its thermodynamic disadvantage. 169PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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