Effects of high sulfur dioxide concentrations
Thread Content
This 100,000-ton tailings acid production plant has experienced a situation where the gas concentration was about 9.5% too high for some time; the outlet temperature of the first catalyst layer decreased by 20 degrees, while the inlet temperature of the second layer dropped by around 20 degrees as well. The temperature difference in the first layer decreased by more than 20 degrees, whereas the temperature difference in the second layer increased by about 15 degrees. May I ask experts: does a high gas concentration have an impact on the catalysts? What effects does a high gas concentration have on catalysts?
It’s probably not due to high gas concentration; could it be that the catalyst activity has decreased at some point?
Thank you. Is the decrease in catalyst activity related to high gas concentration?
Thank you; increasing the oxygen-sulfur ratio temperature still does not restore it.
What is the sulfur dioxide concentration in system design theory? Does the catalyst loading meet the requirements of industrial technology? Is the oxygen supply valve of the desorption tower set at the appropriate position? System uptime? The exhaust volume of the sulfur dioxide fan... etc. A gas concentration of 9.5% can be adjusted; if production continues without making any adjustments, such a high gas concentration over an extended period will definitely have an impact on the catalyst!
The high concentration of sulfur dioxide gas results in a higher temperature at the first-stage outlet, and high temperatures can cause the catalyst to lose vanadium! Foreign catalysts might be a bit better; domestic ones may not withstand high temperatures. According to what you say, the conversion rate in the first stage is low, which inevitably results in a low inlet temperature for the second stage
Check whether there are any changes in the total temperature rise across each layer, and what method is used for tail suction? Is there any online environmental monitoring? (If so, please send me the screen view of the online monitoring.)
Thank you, Teacher Flash! The temperature rise in the first layer decreases, while those in the second, third, and fourth layers increase; the tail suction is due to the absorption of hydrogen peroxide. The online monitoring does not show images of the chimney; it only provides the value of sulfur dioxide in the exhaust gases
It’s a small issue, nothing complicated!