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Chapter 4 Thermodynamic analysis perspective (indeed, such and even higher values have been found in literature: see for instance [2.15], [4.1] and [4.2]). On the contrary, regarding the metallic heat exchanger solution, maximum temperature has been fixed at 800°C, which limits turbine inlet temperature to 740 ÷ 750°C. 4.2.4 GT DIR – Gas turbine directly fed with solid biomass This solution is given by classic internally fired gas turbines where only the natural gas combustor is substituted by a solid biomass fed one, keeping all design data unvaried. This type of plant represents the simplest solution for the use of biomass in gas turbines from a conceptual point of view and has already been investigated [4.3], nevertheless it is quite accepted in the literature that this solution cannot be applied from a practical point of view (see again [2.15], for instance), due to enormous problems related to the expansion of dirty flue gas in the turbine causing heavy damage to the component in short time. All the same it has been considered in this work, essentially for comparison purposes with the other solutions. Also in this case, the three gas turbine configurations have been taken into account, i.e.: • GT DIR SIM – GT DIR with simple cycle (Figure 4.9); • GT DIR REG – GT DIR with regenerative cycle (Figure 4.10); • GT DIR VAP – GT DIR with STIG cycle (Figure 4.11). 4.2.5 ORC – Organic Rankine cycle fed by biomass combustion Turboden plants in their high temperature configuration, i.e. with thermal oil at 300/250°C, both in CHP and pure electric version, are taken as reference. Indeed, these plants can be characterised by several design versions and a little analysis aiming at defining the actual ORC plant configuration to be adopted in the simulations must be effected. Moreover, this gives the chance to actually verify the results with the ones declared by the manufacturer, which are reported in the previous chapter. In particular the main point is to define the use of the hot gases exiting the furnace (their temperature is about 330°C). Three aspects must be assessed and precisely whether or not they effect these operations: 132PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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