Most of the thermodynamic modeling of gasification for updraft gasifier uses one process of decomposition (decomposition of\nfuel). In the present study, a thermodynamic model which uses two processes of decomposition (decomposition of fuel and char)\nis used.The model is implemented in modification of updraft gasifier with external recirculation of pyrolysis gas to the combustion\nzone and the gas flowing out from the side stream (reduction zone) in the updraft gasifier. The goal of the model obtains the\ninfluences of amount of recirculation pyrolysis gas fraction to combustion zone on combustible gas and tar.The significant results\nof modification updraft are that the increases amount of recirculation of pyrolysis gas will increase the composition of H2 and\nreduce the composition of tar; then the composition of CO and CH4 is dependent on equivalence ratio. The results of the model\nfor combustible gas composition are compared with previous study.
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