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As in the previous case, the ratio of mass flow rates between the main compressor and the recompressor was optimized to obtain the temperature of carbon dioxide after LT recuperator equal to 115 °C to provide sufficiently warm enough water to the customers. The heat load adjustment as in the previous case can be realized by the subdivision of the heated water between the consumers and cooling tower (again not shown on the presented Figure). The total amount of cooling water should be the same due to the same reasons as for the cascaded S-CO2 CHP embodiment. In such a scheme, the supercritical CO2 turbine constantly produces 297.7 MW of net electrical power with any heat load values if the HT S-CO2 cycle parameters are left unaltered. Calculation results and concepts comparison The performances of all the presented CHP plant concepts were calculated with different heat loads (HL) and compared with the performances of the T-250/300-23.5 unit. The main results are summarized in Table2 and shown on Figure 7. Table2. Calculated Performances of the Considered CHP Plants Parameter Net electrical power, MW Useful heat, MW Electrical efficiency T-250/300 HL 0% HL 100% 300 250 494.627 38.53% 31.93% 33.76% 17.77% 39.44% 39.44% 37.68% 37.68% 37.97% 31.65% Embodiment 1.a Embodiment Embodiment 1.b 2.a Embodiment 2.b HL 0% HL 100% HL 0% HL 100% 252.283 HL 0% HL HL 0% 100% HL 100% Heat consumption, MW 789.998 304.416 - 266.685 - 140.4 311.56 607.627 - 311.56 421.011 297.66 297.66 - 436.166 - 384.100 Heat utilization factor 0.385 0.945 0.338 0.947 0.394 0.927 0.364 0.929 0.380 0.803 Potential of Useful heat, MW - - - - 421.011 - 436.166 - - - It is obvious from Figure 7 that for all the considered cycles (except for the T-250/300-23.5 cycle) the electrical power varies linearly with the heat load. Note that such a dependency is the consequence of the fact that we keep constant the efficiency of the bottoming CO2 cycle components. The characteristics for the installed unit (T-250/300-23.5) were built using data at the modes with zero and maximum heat loads from the literature [5]. In reality, the T-250/300-23.5 characteristics are slightly different from being strictly linear but it does not significantly affect the results of the current study. 9PDF Image | Study of a Supercritical CO2 Power Cycle Application in a Cogeneration Power Plant
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