SCO₂ 再压缩循环的非设计性能及控制策略研究

The component performance of the SCO₂ cycle changes significantly as the system load decreases. Therefore, a SCO₂ recompression cycle of 10 MW output power is first established in this paper. Then the off-design performance of the system is studied under inventory control and turbine bypass control respectively. The results show that when the system load is reduced to 10%, the thermal efficiency of inventory control decreases to 21.04%, and the re-compressor tends to stall. The thermal efficiency of the turbine by-pass control was 13.56%, and the two compressors are blockage. Based on this, the strategy of inventory-bypass hybrid control is proposed. The use of the hybrid strategy improves the running state of the compressor under the two single strategies, and the system performance is between the two single strategies.