Off-design operation of the multi-fuel CHP cycles

The paper describes the problems when the operation regime of the CI-IP cycle is adjusted according to the user demands. The analysis concerns a multi-fuel system, which utilizes biomass, natural gas and coal. The analyzed system consists of a combined gas and steam cycles. The analysis presented here concerns off-design operation caused by part loading, varying ambient conditions and power demands. An appropriate division of the load between the sub-cycles increases the overall efficiency. The analysis concerns also various options of biomass supply to the system. The research regards mostly the effectiveness criterion as it has a direct influence on the costs of operation.