Coal gasification technology is considered as the best alternative for both of the high efficiency and clean coal utilization and can be applied to the various industrial areas such as IGCC, CTL, SNG production and so on. However, the technology is fairly expensive compared to the simple pulverized coal combustion, if not considering CCS(Carbon Capture and Sequestration). Many coal gasification technologies are under being developed to achieve lower capital cost as well as high efficiency and high cleanness. We aim to develop such technology by adopting special feature of double swirl flow, that is swirl for both of oxidant stream of each burners and surrounding plug flow. At first, CFD analysis for cold flow with top feeding multi-burner was conducted to understand the characteristics such as effective mixing, flow uniformity and particle behavior under double swirl flow. In addition, CFD analysis for reactive flow was performed to decide proper swirl angle which is essential for the burner design. Conceptual design of 1 ton/day-class coal gasifier was carried out based on the such CFD analyses.