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2.a. Cascaded Supercritical CO2 CHP Plant The first embodiment of the second concept is based on the cascaded supercritical CO2 approach [4] in the context of CHP technology (cf. Figure 5. The designations are the same as on Figure 3). According to the approach, the cascade of supercritical CO2 recompression cycles [2] is used for an electrical power production. The cascade of supercritical CO2 cycles is reasonable because of the small temperature difference in the IHX due to the high degree of supercritical CO2 cycle heat recuperation and allows utilizing heat from the burning of the fossil fuel more effectively. The CSCO2H differs from the water SG by that here the economizer and the reheater are absent and by that the two main IHXs will also in all probability differ from the evaporator and the heater in the ordinary SG. Figure 5.Cascaded Supercritical CO2 CHP Plant The temperature of the live carbon dioxide in the HT cycle of the cascade was equal to 540°C while it was equal to 300°C for the LT cycle. The lower pressure magnitude of both cycles was assigned as 7.7 MPa while the compressor outlet pressure magnitudes were optimized and defined as 21 MPa and 20 MPa for the HT and LT cycles, respectively. The recuperators‘ efficiency equal to 95 %. In order to get the possibility to heat the water for the consumers up to 100°C the ratio of mass flow rates between the main compressor and the recompressor was optimized for both the HT and LT cycles of the cascade to finally obtain a temperature of carbon dioxide after the LT recuperator equal to 115°C for HT cycle and 110 °C for LT cycle respectively. In addition, to avoid negative pinch on the water heater (SCO2 cooler) the temperature of the supercritical CO2 after the cooler was increased from 32 °C to 37 °C. Complex SCO2 heater Water Heating HT Supercritical CO2 Cycle Water Heating LT Supercritical CO2 Cycle 7PDF Image | Study of a Supercritical CO2 Power Cycle Application in a Cogeneration Power Plant
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