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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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It should be pointed out that the heat load in such a CHP plant can be adjusted by dividing the cooling water into two parts. One part should be directed to the consumers while the other should go to the cooling tower which is not shown on the presented Figure. However, the total amount of cooling water should be the same to preserve the mode of turbines operation and the power production. In such a scheme both turbines together constantly produce 311.6 MW of net electrical power with any heat load values if all the rest of the conditions are kept constant. It should be noted that the first turbine in the cascade produces much more electrical power in comparison with the second one (297.7 MW vs. 13.9 MW, respectively). Thus, to simplify the scheme the additional water heater was used instead of the second supercritical CO2 cycle. Such a scheme is considered below. 2.b. Single Supercritical CO2 CHP Plant The second embodiment of the second concept differs from the previous one by that the second supercritical CO2 cycle (LT) was substituted by an additional water heater, as pictured on Figure 6 (The designations are the same as on Figure 3). Figure 6. Single Supercritical CO2 CHP Plant The temperature of the live carbon dioxide in the HT cycle of the cascade was equal to 540°C. The minimum pressure of the cycle was assigned as 7.7 MPa. In turn, the maximum pressure was defined as 21 MPa. The temperature of the supercritical CO2 after the cooler was 37 °C. The recuperators‘ efficiency was taken as 95 %. HT Supercritical CO2 Cycle Complex SCO2 heater Water Heating Water Heating 8

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