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TA 4.R: Supercritical Carbon Dioxide Brayton Cycle Recuperated Indirect-fired Brayton Cycle A more advanced version of the indirect-fired Brayton cycle incorporates thermal recuperation. A block flow diagram for such a cycle is shown in Figure 4.R.5. The only change in the cycle is the introduction of a heat exchanger between the expander exhaust and the compressor exhaust. This heat exchange improves the cycle efficiency by reducing the amount of heat lost in the CO2 cooler and increasing the amount of working Figure 4.R.5 Block Flow Diagram for Recuperated Brayton Cycle Credit: NETL fluid that can pass through the cycle for any specified amount of thermal input. A byproduct of this effect is that the pressure ratio for maximum cycle efficiency is considerably lower than for simple indirect-fired Brayton cycles. Figure 4.R.6 shows the cycle efficiency as a function of pressure ratio for three different working fluids with a turbine inlet temperature of 700°C (recuperated Brayton cycle—RB). The dotted curves show the cycle efficiency for a simple or non-recuperated Brayton cycle (simple Brayton cycle— SB). For all working fluids, the recuperated Brayton cycle has a higher efficiency than the corresponding simple Brayton cycle over the entire range of feasible pressure ratios. The maximum feasible pressure ratio for a recuperated Brayton cycle occurs at a much lower pressure ratio than for the simple Brayton cycle. This maximum pressure ratio occurs Figure 4.R.6 Recuperated Brayton Cycle Efficiency. Plot of cycle efficiency versus pressure ratio for recuperated Brayton cycle (solid lines, RB) with three working fluids compared to the simple Brayton cycle (dashed lines, SB).12 Credit: NETL when the compressor outlet temperature equals the turbine exit temperature and further recuperation is no longer possible. For the recuperated Brayton cycle, the point of maximum cycle efficiency occurs at much lower pressure ratios than for a simple Brayton cycle. Although the CO2 cycle has the lowest maximum cycle efficiency, the efficiency curve is relatively flat allowing for more stable operation. Table 4.R.2 shows the maximum cycle efficiencies. 5 QuadrennialTechnologyReview2015PDF Image | Advancing Clean Electric Power Technologies
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