A unified thermodynamic modeling approach for feedstock gasification under adiabatic conditions at the carbon boundary point (CBP) using O 2 , steam, or/and CO 2 as gasification agents is proposed by considering the total hydrogen/carbon ratio, total oxygen/carbon ratio, and total enthalpy entering into the gasifier per mole of carbon as the unifying variables. Three approaches, namely, iterative graphical, noniterative graphical, and analytical approaches, are proposed to predict the amount of a gasification agent required to reach CBP, for any feedstock composition with any combination of gasification agents entering at any inlet temperature. The unified model is validated for 20 fuels chosen on the boundary of the extended Van Krevelen diagram, with the results obtained using Aspen Plus. The model predicts the amount of the gasification agent within an error of 10%. The unified model is also used to predict the gasification temperature, syngas composition, and cold gas efficiency within an error of 10%.
A chemical looping gasification process comprising of
fuel and
air reactors (FR and AR) is thermodynamically analyzed under autothermal
conditions. The analysis takes into account the incomplete carbon
conversion in the FR. Depending on how the unburnt carbon in the FR
is processed, 3 modes of operation are analyzed viz. (1) sending unburnt
carbon to the AR, (2) removal of unburnt carbon from the process,
and (3) recycle of unburnt carbon to the FR. Autothermal operating
conditions are identified for each mode of operation. It has been
shown that, for optimal performance, while mode 1 and mode 2 have
to be operated with minimum flow of oxygen carrier (OC) and medium
air flow, mode 3 has to be operated with maximum OC flow and minimum
air flow. Performance results for mode 1 of operation at the optimal
operation point are generalized to any solid fuel.
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