Sustainable energy and reduction in greenhouse gases (GHG) are the challenging issues of the world. Due to the increase in globing warming concern, the industrial world has already reduced the use of fossil fuels to the status of minimal source of energy. Biomass is now believed to be an economically competitive with the fossil fuels, which can be subsequently used for the production of producer or syngas using appropriate technology of thermal conversion. The low energy contents of biomass are compensated by blending with a higher energy content coal.

 The major objective of this study was to better understand the effect of Temperature change on the producer gas composition in circulating fluidized bed gasifier (CFBG). Primarily the current work is experimental, but supplemented by the mathematical modeling that explains different steps in terms of existing scientific knowledge. The validation results showed  that the model predicted the molar ratio of H₂/CO in the producer gas in the range 0.97, 0.96, 0.93, 0.92,  0.927  and  the measured values  0.83, 0.79, 0.78, 0.73 and 0.74 at temperature degree (°C) 750, 800, 820, 850 and 875  respectively. Similarly the molar ratio of CO/CO₂ predicted by the model was; 0.81, 0.84, 0.86, 0.89 and 0.85 against the experimental molar ratio 0.86, 0.91, 0.75, 0.66 and 0.59 respectively at fixed feed and ER value.