Hello
i`m using Aspen plus for simulation of pyrolysis . when i run the Rgibbs as the reactor . there are many components and then i tried to condense the product to give me the amount of bio oil but the bio oil derived from the flash seperator is included 0.99 of H2O and other components is near to 0.
what is the problem ?
there are lots of possibilities here! maybe the temperature and pressure in the flash drum are not correct and lead to over vaporization. Maybe you choose wrong thermodynamic method for your simulation. follow the streams one by one and check their conditions to find out what is exactly happening
The Rgibbs method in ASPEN PLUS is a thermodynamic method used to estimate the distribution of products in a reaction. The 0.99 H2O in bio oil indicates that the method predicts that 99% of the water in the reaction will be present in the bio oil product. This result may be due to the thermodynamic properties of the system, and it is possible that other methods may give different results.
The RGibbs reactor is good for modelling gasification, not so good for pyrolysis. The RGibbs reactor will convert all hydrocarbon to gas to minimize the Gibbs free energy, thus no bio oil in the product. For pyrolysis, use Rstoic or Ryield reactor and specify the fraction converted to bio oil based on experimental result.
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