Abstract: The design features of the flue gas system, the main steam and its bypass system, the heat supply system, the condensate water system, the auxiliary steam system and the vacuumpumping system of the Fclass “two on one” multishaft gassteam combined cycle heat and power cogeneration unit, which is first coal bed gasfired unit in China, were expounded in detail. The result in this paper can be used as reference for the system design of similar units.

Key words: gas-steam combined cycle unit, heat and power cogeneration, coal bed gas, design feature