The CO2 separation process in a fluidized bed reactor filled with a solid sorbent (calcined dolomite) is studied under different operating temperatures (400-700 °) and pressures (1-30 bar). The gas mixture from a coal hydro-gasifier enters the carbonating reactor, where methane and water are catalytically converted to hydrogen and carbon dioxide. The CO2 is removed from the reaction zone by calcined dolomite, and the product stream is a H2-rich syngas. As a preliminary step, a perfectly stirred, time-dependent model has been developed and implemented in Matlab™ to simulate a fluidized bed and to calculate the composition of the outlet CO2-free syngas and the overall CO2 removal efficiency. The breakthrough curves for the carbonator are predicted by the model as well. The results of this preliminary analysis have then been used to develop a steady-state model of the carbonator, in order to insert the component into the library of a modular object-oriented Process Simulator, CAMEL Pro®: this second-level, systemic model can be used to calculate the percentage of CO2 removed from the fuel gas as a function of the operative conditions and of the sorbent charge level (after the initial transient and before saturation), thus eliminating the time dependence of the equations. The model has been validated with respect to a series of experimental results obtained on a lab-scale reactor.
|Titolo:||Modelling and simulation of a fluidized bed reactor for syngas production with "in Situ" CO2 capture|
|Autori interni:||FOSCOLO, Pier Ugo|
|Data di pubblicazione:||2008|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|