Sodium subtraction desulfurization, crystallization at the bottom of the desulfurization tower.
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Sodium hydroxide is used for desulfurization by subtraction, with crystallization occurring in the desulfurization tower. How can crystallization be avoided, and what measures can be taken for rapid treatment?
Control the concentration! Increase the circulation rate!
Great, concise and to the point; P
We’ve really never seen crystals form in our sodium-alkali process; with such a high concentration, can the SO2 emissions meet the standards? What is the temperature of the kettle liquid? PH? Density?
It can meet the standards: the temperature of the reactor fluid is 70–80°C, the pH value is generally above 10; has the density been measured? Does this also require density control?
Could you guide me on how to control the relevant parameters to avoid crystallization: handshake
With the boiler liquid temperature so high, it indicates that the flue gas temperature is also high – can your tray tower handle that? Another point to note is that the fluid replenishment and discharge volume are low; we usually operate at around 50°C, with an inlet temperature of 130. pH control is set at 10. The amount of alkali used is quite high, and crystallization can occur easily. By monitoring the SO2 content at the inlet, we can keep the SO2 level at around 6 to meet the requirements – it should generally not be lower than 5.5. So far, the highest density achieved during operation has been 1.1, which is a fairly good result
Is it necessary to have a separate crystallization tank (crystallization vessel) to precipitate sodium sulfate crystals?