Desulfurization liquid temperature range
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Our plant uses sodium carbonate for desulfurization, with WZ as a catalyst. At present, the rate of by-product salt formation is quite high, with Na2SO4 concentrations ranging from 30 to 50 g/l. Severe blockages occur in the pipelines after shutdowns for maintenance. What should be the appropriate temperature for the desulfurization solution, and what level of regeneration air volume is needed to reduce the formation of by-product salts? Thank you all!
What is your sulfur content? Generally, 38-42 is sufficient. The temperature of the gas entering the tower should not exceed 40 degrees. What kind of regeneration equipment do you use?
The temperature of the desulfurization liquid should be maintained between 35 and 40 degrees; it must not exceed 40 degrees. Once it exceeds 40 degrees, the rate of formation of double salts increases. The temperature of the gas undergoing desulfurization should be 2-3 degrees lower than that of the desulfurization liquid, as this facilitates the desulfurization process
Theoretically, 1.57 m3 of air is required to absorb 1 Kg of hydrogen sulfide, but in practice this amount is 10–15 times higher than the theoretical value. The blowing intensity in the regeneration tank is 60–100 m3/m2h; exceeding this level leads to an increased amount of air being drawn in, thereby exacerbating side reactions. 2NaHS + 2O2 = Na2S2O3 + H2O; Na2S2O3 + O2 = 2Na2SO4 + 2S
The content of by-products isn’t high; it’s not clear how much sodium thiosulfate there is. The temperature is generally between 38 and 42 degrees; above 45 degrees, the formation rate of by-products increases rapidly. Severe clogging after parking is likely due to low temperatures, which cause salts to precipitate. When parking, try to drain the alkali solution accumulated in the pipes.
The high temperature of the desulfurization solution leads to the formation of higher levels of by-products, which has a significant impact on the desulfurization process. Generally, the temperature of alkaline desulfurization solutions should be kept between 35-38°C, with efforts being made to avoid temperatures above 38°C. Meanwhile, the temperature of the gas should be lower than that of the desulfurization solution; typically, the temperature of the gas coming out of the benzene washing tower is between 31-33°C. In any case, the lower the desulfurization temperature, the fewer by-products are produced; the most important thing is to make decisions based on one’s own process parameters.