Application of online pH meter in wet flue gas desulfurization
The pH value is the negative logarithm of the hydrogen ion concentration in a solution (pH=- lg [H+]), which represents the pH value of the solution. The pH value of the slurry in the FGD (Flue GasDesu l purification) absorption tower is a key detection and control parameter, which affects the supply of absorbent and desulfurization efficiency in the absorption tower.
The higher the pH value, the faster the diffusion rate of SO2 to the main body of the liquid film, and the larger the mass transfer coefficient, which promotes the absorption of SO2. However, it is not conducive to the dissolution of limestone and can easily cause equipment system sedimentation and blockage;
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When the pH value is lower, it is beneficial for the dissolution of limestone, but due to the stronger acidity, it is difficult to absorb SO2 acidic gas, resulting in a decrease in desulfurization rate.
If the pH value is less than 4, the system is almost unable to absorb SO2, and at this time, the acidity of the absorbent slurry increases, causing severe corrosion of the equipment.
Therefore, an appropriate pH value can allow the desulfurizer in the entire desulfurization system to crystallize and form block gypsum through treatment by vacuum belt conveyors and filter presses, making it easy to recycle. In order to balance the two for forced oxidation absorption towers, an online pH meter is generally used to control the pH value within the range of 5.0 to 6.0.
