Numerical analyses of MHD-steam combined cycle system with tail gas gasification

This paper discusses the concept of the gasified MHD-steam combined cycle system and sets up a research scheme on the combined cycle system. In this system one part of the high temperature tail gas going out from the MHD channel is utilized to gasify the coal, then the clean syngas is produced in the gasifier. Another part of the tail gas goes into radiation furnace. Based on this thermal chemical regeneration technique the chemical energy of the syngas is more than that of the coal, and on the other hand the syngas as the clean fuel is combusted in the MHD combustor. In this way we can overcome the difficulties brought by the ashes. In the gasifier the sulphur is got rid of by inserting limestone, so the recovered seed is potassium carbonate and the cycle system does not need a seed regeneration unit. The physical models are built and the code is developed. In this paper we have calculated the thermodynamic properties of the system. The parameters of this system are determined, then the efficiency of the combined cycle system is computed, which is higher than traditional MHD-steam combined cycle system.