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废气污染物二氧化硫脱硫实验系统测控关键技术研究
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摘要
针对目前大气污染治理政策,结合船舶废气脱硫要求进行了废气脱硫实验系统测控关键技术研究。对SO2激光测试中的光声腔结构进行了改进与计算,提高了测试响应速度。采用非线性预测函数控制方法仿真研究了pH非线性控制问题,采用协调控制及耦合解耦控制算法,对废气脱硫喷淋循环过程控制存在的多变量耦合控制问题进行了控制仿真研究,仿真结果表明控制系统抗干扰性、稳定性等得到明显提高。搭建了废气脱硫实验室系统,采用PLC+WinCC研制了一套废气脱硫测控软硬件系统,解决了废气脱硫实验系统存在的多变量控制、多传感器测试问题。最后,实验研究了废气脱硫综合影响因素与脱硫率之间的关系,得出了脱硫率与液气比、pH、Na离子、SO2浓度等之间的影响关系,并实现了废气脱硫效率大于97.2%的脱硫目标。同时,对比分析了脱硫剂分别为NaOH、MgO时的废气脱硫效率,确定了将NaOH作为船舶尾气脱硫剂。
Foucs on recent atmosphere pollution policy, combined with the vessels exhaust gasdesulfurizatrion requirement, the key technology study on eficient exhaust gas desulfurizationmeasurement and control system has been done. The photoacoustic cell of laser SO2test hadbeen designed to emprove the SO2test speed, and the predictive functional control was used tosimulate unlinear pH control problem. For the lots variables control problems in the spray cyclecontrol, the coordinated control of the coupling decoupling control algorithm were used tosimulate the control procees, simulated results showed that interference immunity, stability of thecontrol system were improved. The exhaust gas desulfurization experiment platform wasestablished, to solve the multivariable tset and coupling control problems of the exhaust gasdesulfurization test control process, the exhaust gas desulfurization test control system wasdesigned based on the PLC+WinCC. At last, the gas desulfurization experiments have been done.The relationship between combined effects of flue gas desulfurization and desulfurizationefficiency has been studied, and obtained the relationship between desulfurization efficiency andliquid-gas ratio, pH, Na ions, SO2concentration and so on, and realized the desulfurization goalsof over97.2%. Meanwhile, compared the desulfurization efficiency of NaOH and MgO, anddetermined NaOH as the vessels flue gas desulfurization agent.
引文
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