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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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Reheater Superheater To IP turbine To HP turbine Steam to reheat Evaporator Burner Economizer Air heater Feed water Figure 2. Fossil Fuel Fired Water Steam Generator. Consideration of SG for a single S-CO2 cycle is especially important because of the small temperature difference in the main heater due to a high degree of the heat recuperation. Such a fact is necessary to take into consideration with S-CO2 power cycle coupling for each specific heat source. Some issues of supercritical CO2 power cycle coupling to the different heat sources were presented in the report [4]. Typical Steam Rankine cycle CHP plants are usually based on a condensation steam power cycle. In such an embodiment the cogeneration is implemented by the adjustable steam extraction for heat production. In dependency with the useful heat purposes the extraction as well as the heated water may have different parameters. For urban centers or campuses heating, the typical steam pressure of the extraction is about 0.2 MPa due to the value of the condensation temperature at this pressure (120.21 °C.) Steam from this extraction is heating the water for the consumers. After the heating the water usually has a temperature around 100°C. The typical pressure of the water for the consumers is about 1 MPa. The mentioned parameters were used as the base in this study. In order to accommodate supercritical CO2 technology to CHP conception, a lot of configurations and approaches were considered and the following two approaches with two embodiments for each were selected as the most interesting ones: 1. Steam Rankine cycle CHP plant with bottoming supercritical CO2 cycle a. Combined Complex Steam-S-CO2 CHP Plant b. Combined Simple Steam-S-CO2 CHP Plant 2. CHP plant with single supercritical CO2 working fluid a. Cascaded Supercritical CO2 CHP Plant b. Single Supercritical CO2 CHP Plant 3

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

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