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Table 3.8 Key Design Parameters and Performance of Recompression Compressor Using Two Radial Stages 300MW PCS unit recompression each stage of a two-stage design Ns Ds Efficiency Impeller diameter Impeller Tip speed compressor, 0.427 5.78 85.9% 1.061 m 200 m/s By using a two-stage design, the efficiency increased by 13%, and impeller diameter reduced by 30%. 3.4.3 Three-Stage Design The efficiency can be further improved if a three-stage design is employed. Table 3.9 lists key design parameters and performance data of a three-stage design of the recompression compressor. Table 3.9 Key Design Parameters and Performance of Recompression Compressor Using Three Radial Stages 300MW PCS unit recompression compressor, each stage of a three-stage design Ns Ds Efficiency Impeller diameter Impeller tip speed 0.579 4.17 89.8% 0.848 m 160 m/s The three-stage design improves the efficiency by another 4% compared to the two- stage design. Compared with the single stage design, the efficiency is improved by 17%. The size is reduced by 45% compared to the single stage design, and 20% compared to the two-stage design. The efficiency versus number of stages is plotted in Fig. 3.5. The plot clearly shows that there will be no significant efficiency gain as more stages are used. Fig. 3.6 shows how the diameter varies with the number of stages. Again, as the number of stages increases to above 3, it has less impact on the diameter of the impeller. 21PDF Image | Radial Compressor Options for Supercritical CO2 Power Conversion Cycles
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