Due to wet desulfurization system lacks effective control indicators for the oxidation process, so the sulfite oxidation in the slurry and the quality of gypsum become unstable. In this paper actual desulfurization system operation data are used to improve the ORP semi-empirical formula obtained in the laboratory. It was concluded that the ORP was mainly affected by the concentration of sulfite and pH during the operation of the actual desulfurization system, the dissolved oxygen was less affected by the small concentration change during operation. It is verified that the model can correct the ORP measurement value by using other conventional measurement data from the power plant. The results can provide theoretical support for adding ORP as a control index to optimize the oxidation process.

Implications

At present, the main control parameter of wet FGD is pH control, but wet FGD has two main reactions at the same time, one is acid-base reaction, the other is redox, single pH control can not reflect the degree of redox, so it is necessary to introduce another control index to evaluate redox, which is the ORP control proposed in this paper, ORP can reflect the degree of slurry oxidation, avoid the occurrence of excessive oxidation and inadequate oxidation, so that the operation of desulfurization system can be more healthy and stable.

中文翻译：

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湿法脱硫中ORP作为浆液氧化指标及模型修正

由于湿法脱硫系统缺乏用于氧化过程的有效控制指标，因此浆料中的亚硫酸盐氧化和石膏质量变得不稳定。本文使用实际的脱硫系统运行数据来改进实验室获得的ORP半经验公式。可以得出结论，在实际脱硫系统运行过程中，ORP主要受亚硫酸盐浓度和pH值的影响，在运行过程中浓度的微小变化对溶解氧的影响较小。验证了该模型可以通过使用来自电厂的其他常规测量数据来校正ORP测量值。该结果可为添加ORP作为控制指标以优化氧化过程提供理论支持。

含义

目前，湿法烟气脱硫的主要控制参数是pH控制，但湿法烟气脱硫同时有两个主要反应，一个是酸碱反应，另一个是氧化还原，单一的pH控制不能反映氧化还原程度，因此有必要引入另一个控制指标来评价氧化还原，这是本文提出的ORP控制方法，ORP可以反映浆液的氧化程度，避免发生过度氧化和氧化不充分，从而可以使脱硫系统运行正常。更健康稳定。