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直接空冷机组和常规湿冷机组由于在冷端系统上差别较大,使得空冷机组的控制必须考虑外部环境变化对于汽轮机冷端的影响。该文在空冷凝汽器静态变工况计算的基础上,考虑空冷系统凝汽器的蓄热效应,建立了直接空冷凝汽器动态数学模型,该模型能够分析冷却空气迎面风速和环境温度对直接空冷系统凝汽器动态特性的影响。得到了冷却空气迎面风速和环境温度对直接空冷机组背压的影响曲线,仿真结果表明随着环境温度的升高和冷却空气迎面风速的降低,系统的稳定时间变长,证明直接空冷系统凝汽器的时间常数随着空冷凝汽器的散热能力的强弱而有相应变化,并为进一步研究适用于直接空冷机组的背压保护控制策略提供了参考。
Due to the large difference between cold-air systems and conventional wet-cooling systems, the control of air-cooled units must consider the influence of external environment changes on the cold side of the steam turbine. Based on the calculation of the static state of the air-cooled condenser and considering the heat-storage effect of the condenser in the air-cooled system, a dynamic mathematical model of the direct air-cooled condenser is established. The model can analyze the effect of the direct wind speed and ambient temperature Influence of condenser dynamic characteristics on air cooling system. The influence curve of the oncoming wind speed and the ambient temperature on the backpressure of the direct air cooling unit is obtained. The simulation results show that as the ambient temperature increases and the oncoming wind speed of the cooling air decreases, the system settling time becomes longer, which proves that the direct air cooling system condensate The time constant of the device changes correspondingly with the heat dissipation capacity of the air-cooled condenser, and provides a reference for further research on the back pressure protection control strategy applicable to the direct air-cooled unit.