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The cogeneration steam turbine unit T-250/300-23.5 was taken as a base for comparison. The performance warranty for both electrical power and combined heat and power modes is presented in table 1 [5]. Parameter Total heat consumption Live steam temperature Live steam pressure Net electrical power Heat production Table 1.T-250/300-23.5 performance warranty. Unit No Heat Load MW 790 °C 540 MPa 23.5 MW 300 MW 0 Maximum Heat Load 790 540 23.5 253 384 In order to correctly compare the proposed concepts of S-CO2-based CHP plants with the ordinary CHP unit presented above we use the same total heat consumption and live steam conditions for the combined Steam-S-CO2 schemes. However, for the S-CO2 schemes the live pressure of S-CO2 was optimized and was consequently different. The efficiency of the steam turbine cylinders as well as the CO2 turbine and the compressor were taken as 90 %. The efficiency of the alternators was assigned as 98% and the heat losses for the regenerative heaters of the steam cycle part as well as for the S-CO2 recuperators were defined as 1 % from the transferred heat amounts. 1. Steam Rankine Cycle CHP Plant with Bottoming Supercritical CO2 Cycle The first concept of CHP is the following: we took the same SG as in the T-250/300-23.5 but the proper scheme of this steam turbine unit was modified by removing of some Steam cycle components. In place of the steam cycle parts that were removed the bottoming S-CO2 cycle was incorporated. Heat production is realized by using some portion of steam after the turbine for water heating which then is directed to the consumer. 1.a. Combined Complex Steam-S-CO2 CHP Plant In the current embodiment instead of the adjustable extraction we fully exclude the Low Pressure (LP) cylinder of the turbine so the steam after the Intermediate Pressure (IP) cylinder is directed 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 (Figure 3.) In spite of the steam scheme simplification the steam part still has a system of regeneration which includes 1 Low Pressure (LP) heater and 3 High Pressure (HP) heaters as well as a steam reheat after the High Pressure (HP) cylinder. Since we excluded the LP cylinder changes of the heat load does not affect the steam turbine performance. The considered bottoming supercritical CO2 cycle is quite simple and corresponds to a simple closed recuperated Brayton cycle [6]. The scheme consists of a turbine, a compressor, a recuperator and a cooler. The maximum supercritical CO2 temperature is equal to 120°C according to the steam saturation temperature at the pressure of 0.2 MPa. Actually, the temperature of the CO2 should be slightly lower than 120° C due to underheating (temperature closure). However the underheating was compensated by the heat of the superheated steam before the Intermediate Heat Exchanger (IHX). The bottoming supercritical CO2 cycle has a lower pressure of 7.7 MPa and a compressor outlet pressure of 15 MPa. 4PDF Image | Study of a Supercritical CO2 Power Cycle Application in a Cogeneration Power Plant
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