【摘要】 从实际工程应用出发，建立了单塔双循环湿式烟气脱硫（Single-tower and double-circulation wet flue gas desulfurization, SD-WFGD）系统的控制系统。首先，利用历史运行数据，考虑SD-WFGD系统运行过程吸收塔变频浆液循环泵在不同浆液pH时单位频率变化对烟气SO₂浓度的影响，建立了系统动态模型。然后，基于浆液pH脱硫能力提出了直接硫量平衡控制（Direct sulfur balance control, DSC）策略，将已建立的动态模型作为控制模型，并利用传统PID控制器结合DSC策略，建立了SD-WFGD系统串联控制系统。仿真实验结果表明：与传统的PID控制方案相比，所提优化控制方案减小了供浆流量和出口SO₂浓度的波动，能够大幅度提升SD-WFGD系统的控制性能，从而更好地保证脱硫系统在燃煤电站灵活运行的背景下安全、稳定、经济及灵活运行。更多还原

【Abstract】 From the perspective view of the practical engineering application, the control system called the single-tower and double-circulation wet flue gas desulfurization（SD-WFGD） system was established. Firstly, the dynamic model was developed by analyzing the impact of the unit frequency change of the absorption tower variable frequency slurry circulation pump on the flue gas SO₂ concentration at different slurry pH during the operation of the SD-WFGD system. Secondly, the direct sulfur balance control（DSC） strategy was proposed based on the desulfurization capacity of the slurry pH. The established dynamic model was then applied as a control model, and a serial control system for the SD-WFGD system was established by combining traditional PID controllers with the DSC strategy. Simulation test results demonstrated that, compared to traditional PID control schemes, the proposed optimized control scheme reduces fluctuations in slurry supply flow and outlet SO₂ concentration, significantly enhancing the control performance of the SD-WFGD system. This model can ensure the safe, stable, economical, and flexible operation of the desulfurization system in the context of flexible operation at coal-fired power stations.更多还原