Study of a Supercritical CO2 Power Cycle Application in a Cogeneration Power Plant

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Study of a Supercritical CO2 Power Cycle Application in a Cogeneration Power Plant ( study-supercritical-co2-power-cycle-application-a-cogenerati )

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Structurally, the bottoming supercritical CO2 cycle was the same as in the scheme of Figure 3. However, some of parameters were different. Namely, since we removed the IP cylinder of the steam turbine the pressure after the turbine became 3 MPa. Accordingly, the live supercritical CO2 temperature was equal to 225°C. It should be noted that the saturation temperature at the pressure of 3 MPa is 233.8°C so the underheating was equal to 8.8 °C which is different from the previous scheme because it could not be compensated by steam superheating due to its small magnitude. The bottoming supercritical CO2 cycle has a lower pressure of 7.7 MPa and an upper pressure of 25 MPa. The temperature of the supercritical CO2 after the cooler was 32°C with a recuperator efficiency of 95 %. Steam Generator Figure 4. Combined Simple Steam-SCO2 CHP Plant 2. CHP plant with single supercritical CO2 working fluid The second concept of CHP is the concept according to which only the supercritical CO2 fluid is used and the heat from the fossil fuel burning is transferred to the supercritical CO2 directly to the complex heater. It should be pointed out that strictly speaking the fossil fuel burner cannot be named as Steam Generator for this scheme because it does not generate steam but instead warms up the supercritical CO2 fluid. For this reason, it is named here as Complex Supercritical CO2 Heater (CSCO2H). CSCO2H is of the same type as the Water SG but with accommodated internal heaters to the supercritical CO2 features. The heat production is realized by water heating in the supercritical CO2 coolers or directly in the complex heater. The obvious advantage of such a concept is that the only one working fluid is used. 6 Water Heating Bottoming SCO2

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