A large-eddy simulation of a coal gasification two-phase reacting flow on an entrained two-stage coal gasifier was performed to demonstrate the applicability of LES to this reacting field on the massively parallel computing on K computer. The CRIEPI's 2.4 tons/day research gasifier was targeted. Results show that the strong swirl flows are formed within the combutor of the gasifier. The large part of particles traveling in the combustor should be expected to be captured by the centrifugal force and the characteristics is essential to optimize the gaisifer's design and operating conditions. It is confirmed that the LES is a potentially powerful tool to predict the strong swirl reacting flows within the entrained flow gasifier.