Fuel characterization and gasification of sunflower waste in sub and supercritical water with influence of catalysts on optimum state.

In this work to investigate sub and supercritical water gasification (SASCWG) of Sunflower waste (SFW). The basic fuel characterizations were carried out, as well as the ultimate analysis, As operational parameters, the reaction temperature (350°C, 400°C, and 450°C), feed concentration (2, 6, and 10%), residence time (10, 20, and 30 minutes), and various catalyst additives (K2CO3, Na2CO3, and NaOH) were used. The response surface method (RSM) was also used to construct the experiment and explore the interactions between the operational parameters. The response from SCWG of SFW was termed as produced gas yield compositions. The SFW has an acceptable fuel characterization using it as an energy source. According to the results of non-catalytic processes, subcritical water gasification has small influence on H2 generation counter to supercritical gasification, the rise in reaction temperature is the most important factor in H2 generation. Regarding the catalytic process on supercritical gasification, NaOH exhibited the greatest outcomes and loading it enhances the process responses. Keywords: Sunflower waste, Hydrogen, Fuel characterizations, Sub and Supercritical water gasification, Response surface method.