In biomass gasification, the appropriate prediction of gasification products is one of the most important issues. In this work, a steady state equilibrium model for the pilot -scale circulating fluidized bed by using Aspen Plus is developed. The model is capable of predicting the composition of synthesis gas. The process is simulated in accordance with the fluidized bed gasifier assembly. The simulation represents entire unit operations involve, to process palm kernel shell followed by a series of equilibrium air and steam gasification reactions to obtain adequate Synthesis gas yield. The temperature is varied from 600 °C to 700°C while for steam to biomass ratio, it is manipulated from 1.5 wt/wt. to 2.5 wt/wt. The optimum temperature and steam to biomass ratio is determined in this study. © 2016 The Authors. Published by Elsevier Ltd.