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The temperature of the supercritical CO2 after the cooler was 32°C and the recuperator efficiency was taken as 95 %. In such a scheme the steam turbine constantly produces 252.3 MW of net electrical power with any heat load values if all the conditions are kept constant. However, the electrical power produced by the CO2 turbine is varying depending on the heat load. It is obvious that when we direct more steam to the CO2 heating loop we produce more electricity and less heat and vice versa correspondingly. Figure 3. Combined Complex Steam-SCO2 CHP Plant The obvious advantages of such a concept of CHP plant are that the SG remains the same so it is not necessary to design a new one for the S-CO2 implementation, which in turn can be a quite challenging task. The HP and IP steam turbine cylinders also remain the same as well as the HP and LP heaters of the steam turbine unit regeneration system while featuring the absence of a volumetrically imposing LP cylinder. The condenser will be significantly smaller than an ordinary one because of the high pressure of condensation. The bottoming S-CO2 cycle is extremely simple due to the low temperature of the live CO2, the single recuperator scheme and the low temperature gradient at the recuperator. 1.b. Combined Simple Steam-S-CO2 CHP Plant The second considered embodiment according to the first approach is the cycle with the simpler diagram of Steam Cycle part than in the embodiment of section 1.a. The new scheme is presented on Figure 4 (The designations are the same as on Figure 3). The simplification is done through the removing of the IP cylinder and all of the steam heat regeneration system. Thus in this scheme the steam after the HP turbine flows to the control splitter which divides the main flow into two parts. The first part is directed to the supercritical CO2 heating and the second part goes to the water heating for the consumers. In such a scheme the steam turbine constantly produces 140,4 MW of net electrical power with any heat load values at ceteris paribus. As in the previous embodiment the electrical power produced by the CO2 turbine is depends on the heat load. Water Heating Steam Generator 5 Bottoming SCO2PDF Image | Study of a Supercritical CO2 Power Cycle Application in a Cogeneration Power Plant
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