Sang Jun Yoon

Gasification of biodiesel by-product with air or oxygen to make syngas

In the present study, gasification of biodiesel by-product, crude glycerin, was performed in an entrained flow gasifier. Gasification was conducted in a temperature range of 950-1500 degrees C and excess air ratio of 0.17-0.7 for air or oxygen as a gasification agent. From the results, syngas heating value, carbon conversion and cold gas efficiency of more than 2500 kcal/Nm(3), 92% and 65% were achieved, respectively. The H(2)/CO ratio of the product gas was varied from 1.25 to 0.7 with the excess air ratio and this gas composition was favorable for DME synthesis. The optimum excess air ratio for gasification of biodiesel by-product was evaluated to be an approximately 0.35-0.4. The present results indicate that crude glycerin can be utilized as a feedstock for gasification to make syngas.

Supercritical Water Gasification of Low Rank Coal with High Moisture Content

Abstract >> Study on clean and efficient utilization technology for low rank coal with high moisture content is actively ongoing due to limited reserves of petroleum and of high grade coal and serious climate change causedby fossil fuel usage. In the present study, supercritical water gasification of low rank coal was performed. Withincreasing reaction temperature, content of combustible gases such as H 2 and CH 4 in the syngas increased while the CO 2 content decreased. As the reaction pressure increased from 210 to 300 bar, the CO 2 content in the syngasincreased while the hydrocarbon gas content decreased. The H 2 and CH 4 content in the syngas increased slightlywith pressure. With the addition of Pd, Pt, and Ru catalysts, it was possible to improve the production of H 2 .Moreover, the increase of active metal content in the catalyst increased the H 2 productivity. The Ru catalyst showsthe best performance for increasing the H 2 content in the syngas, while decreasing the CO 2