Issues worth noting in the wet oxidation desulfurization process

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In wet oxidation desulfurization, its operational efficiency and stability control are influenced by various factors. The following are some key points summarized by me for your reference. 1. pH value of the desulfurization solution: It should be kept as low as possible, as long as it meets the requirements for gas purification, provided that this allows for stable operation, reduced formation of by-products, stable column resistance, and sufficient buffering capacity of the solution. It is not advisable to control it at too high a level; excessive pH values exacerbate the desulfurization side reactions, leading to the formation of large amounts of by-products. And what high a pH level will lead to waste of alkali. 2. Solution circulation rate: Increasing the circulation rate appropriately is beneficial for preventing dry areas in the packing and ensuring thorough gas-liquid contact. Low reagent content and high circulation rate to reduce the mass of components in the desulfurization solution, taking comprehensive benefits into account. A low solution circulation rate can easily lead to tower blockage. 3. Operating temperature: Low temperatures are favorable for absorption, while high temperatures are beneficial for regeneration and for the decomposition of by-products. It is necessary to take into account both the test data and the results of regenerative flotation in order to verify and make adjustments; for the ammonia method, a temperature control range of 35°–38° is used as a reference, while for the alkaline desulfurization method, a temperature range of 38–42° is used as a reference. 4. Regeneration: Meet the three key requirements of catalyst regeneration, sulfur precipitation, and flotation; maintain foam layer stability by ensuring continuous foam overflow, while also taking into account changes in suspended sulfur and by-product salt levels. Regeneration is the most important step in the entire process. 5. By-products: As their accumulation reduces the concentration of the active components in the solution, they need to be removed when they exceed the specified limits. Temperature, pH value, chemicals used, gas raw materials, equipment compatibility, and various process stages are all closely related to one another; strict management and timely detection and adjustment pose challenges at the site. 6. Gas source control: The insufficient attention paid to the raw gas leads to frequent system problems; a clean raw gas source is highly beneficial for the stable operation of desulfurization processes. 7. Sulfur balance: The issue of sulfur balance is well understood by everyone; once it is disrupted, it severely undermines the stability of the system. The most important measure is to prevent sulfur buildup in the tower, but due to various other considerations, it is often not possible to achieve perfect sulfur balance, requiring careful attention at both the upper and lower levels.