As a high efficiency and low pollution combustion technologys coal-fired combined cyclehas drawn so much attention and been developed quickly all over the world during the lastseveral years. A novel combined cycle system was put forwajrd by Thermal Engineering Department of Tsinghua University in 1992. The improved type of the system now named cokecarried--heat gasification coal--fired combined cycle, whose renovate include: the gasificationchamber was moved from the boiler inside to outside as a separate gasifier which took thecoke as gasification heat source. This paper adopted cell model and modular method to setup a complete steady state mathematical of the combined cycle according to the characteristic of the different components. This model is very important to set up the simulation software package of the large scale coal--fired combined cycle and research the dynamic characterof the system and carry out the control scheme.
