In the low-pressure urea production system using the carbon dioxide stripping method, the pressure is high, but the concentration of ammonium methylate solution is not high – could it be that the packing in the distillation tower is damaged?
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In the low-pressure urea production system using the carbon dioxide stripping method, the pressure is high, but the concentration of ammonium methylate solution is not high – could it be that the packing in the distillation tower is damaged? Was partially damaged packing blown into the condensation system, causing the tubes to get clogged?
Is it caused by partial crystallization in the low-pressure condensation system?
There is no crystallization; the temperature difference remains above 11°C, with no significant changes. Keeping the inlet water temperature at 60°C prevents crystallization. Currently, the concentration of ammonium hydroxide solution does not exceed 60
It’s necessary to check the distillation tower feed distributor; photos would be helpful, and fellow sailors can assist with the analysis.
This post was last edited by WJHSWSW on 2015-7-29 at 13:49. Check whether there is cross-feeding in the stripper Is the liquid level in the low-temperature coolant sump too high? To be more specific, is it the pressure in the distillation tower that is high, or is it the gas phase pressure in the low-pressure liquid level tank that is high? Easy to analyze.
When the operating conditions are stable and the indicators are normal. Heat exchange of circulating water can be considered; high temperatures result in a reduced flow rate of the circulating water, which leads to insufficient condensation and an increase in pressure in the low-pressure system.
The temperature difference in the low-pressure water is 11°C, which seems high; ours is 3.5°C. Is the flow rate of the low-pressure water too low? Check the low-flow rate and the operation of the pump?