What are the reasons for a high pressure difference in urea recovery? How should it be handled?
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1. What are the reasons for the high pressure difference in the urea recovery section? How should it be handled?
May I ask the original poster: Which type of technique are you referring to? Is it an aqueous solution, or CO2 stripping? With different processes, the reasons for analysis might vary, right? Could you be more detailed?
We use the CO2 stripping method; sometimes a high recovery pressure difference occurs, and after installing the dehydrogenation system, this phenomenon happens more frequently than before. This post was last edited by lxq700918 on 2008-12-31 15:37.]
Does the poster refer to the pressure difference in the low-pressure absorption tower, or the pressure difference before and after the low-pressure ammonium methoxide condenser in the low-pressure circulation system? If it is the pressure difference in the low-pressure absorption tower, this issue should not arise after dehydrogenation, unless too much anti-corrosion air has been added. In the case of a low-pressure decomposition and recovery system, it is very likely that the decline in the stripping efficiency of the stripper is caused by a high load on low-pressure recovery.
I’m not sure if the poster is referring to that 4 bar absorption, low-pressure circulation system. In the case of a low-pressure cycle, it might be due to oil in the system, an excessively low liquid level in the gas column, which causes some gas leakage. You might consider raising the liquid level in the lift column a bit.
The concentration in the absorption system is too high, resulting in excessive gas resistance; it is likely due to an imbalance in the ammonia-to-carbon ratio. This can be adjusted by adding water for dilution or by reducing the amount of material sent for recovery.
The problem description is not clear; just state which device has a pressure difference with which other device