The off-design performance of partial heating carbon dioxide power cycle driven by the waste heat of gas turbine is quantitatively analyzed in this paper. Firstly, multi-objective optimization is carried out from the perspective of thermodynamics and economics to determine the cycle parameters in design phase. The heat exchanger and turbomachinery are preliminarily designed based on the optimization results. Then, the performance of partial heating cycle under off-design conditions is investigated considering variable flue gas parameters and ambient temperature. The results indicate that the net power output would increase by 0.62 MW on average as the mass flow rate of flue gas increases by 5 kg/s. For every 10 °C increase in flue gas inlet temperature, the net output power will increase by 0.29 MW. However, the system exergy efficiency first increases then decreases as the mass flow rate of flue gas increases. The net power output and system exergy efficiency show descending tendency as ambient temperature increases. In summary, the regulation of cycle maximum pressure should be highlighted in response to the variation of flue gas parameters while the adjustment of cycle minimum pressure should be emphasized in response to the variation of ambient temperature.

本文对燃气轮机余热驱动的部分供热二氧化碳功率循环的设计外性能进行了定量分析。首先，从热力学和经济学的角度进行多目标优化，以确定设计阶段的循环参数。根据优化结果对热交换器和涡轮机械进行了初步设计。然后，考虑了可变烟气参数和环境温度，研究了非设计条件下的部分加热循环的性能。结果表明，随着烟气质量流量增加5 kg / s，净输出功率平均增加0.62 MW。烟道气入口温度每升高10°C，净输出功率将增加0.29 MW。然而，随着烟气质量流量的增加，系统的火用效率首先增加，然后降低。随着环境温度的升高，净输出功率和系统的（火用）效率呈下降趋势。总之，应根据烟气参数的变化强调循环最大压力的调节，而应根据环境温度的变化强调循环最小压力的调节。