Reasons for the delay in the conversion reaction
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What are the reasons for the delay in the conversion reaction? And the handling methods?
The low conversion rate of Guanmian might be due to insufficient temperature or an ineffective catalyst, among other reasons.
The conversion reaction is delayed; this is likely because the catalyst begins to lose its activity after reacting for a certain period of time. The main solutions are to replace the catalyst, regenerate it in situ, or increase the initial temperature of the catalytic bed. There’s no good solution! !
Hehe, the fact that there is a reaction when it’s shifted backward indicates that the catalyst at the back is still in good condition. Although the conversion rate isn’t great, it should be sufficient to get by for a while. What’s concerning is if there’s no reaction even after shifting it backward – in that case, things will be bad.
After the reaction shifts backward, the temperature rise in the subsequent bed layers increases, leading to an increase in the exit temperature of those beds. As a result, the equilibrium conversion rate decreases, and the overall conversion rate also drops. Thinking in reverse, advancing the reaction time can somewhat increase the overall turnover number, but it comes at the cost of the catalyst’s long-term performance.
In many cases, it is due to the excessive air volume of the main fan; such a high volume of air drives the temperature upward. Sometimes it is also because of the low concentration of sulfur dioxide. The main approach to resolving this issue is to first adjust the conditions of the boiling furnace, then reduce the air volume supplied by the conversion fan slightly; this should improve the situation. If that doesn’t work, using an electric furnace to lower the temperature ahead can help.
The catalyst’s activity has declined; increasing the inlet temperature by a certain amount may help, but if that doesn’t work, the catalyst will have to be replaced.
First, check whether the temperature in the first few sections meets the required standards. If it does, move on; otherwise, examine whether the system is overloaded, or whether there are any short circuits in the catalyst layer, as well as any signs of aging or blockage.
Hehe, there are many reasons: 1. The activity of the catalyst decreases over time; 2. An excessively high CO concentration can also cause the reaction to shift backward (as specified in the sulfuric acid manual). There are other reasons as well that can lead to a shift in the reaction direction. Hehe
Check; if the powdering is severe, it can also cause the conversion temperature to increase. We encountered it once; after screening the top 25 centimeters, it was fine!
1. Unstable gas concentration that is too high or too low. 2. Air leakage in the heat exchanger. 3. Reduced activity of the catalyst. 4. If the temperature was too high in the initial stage, Stage 1 may collapse