Analysis of the reasons for the activation of the safety valve in the urea cycle system
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What are the reasons for the activation of the safety valve in the gas-phase pipe of the distillation column in the urea cycle system?
In my opinion: 1. The low-pressure methamine condenser does not provide good cooling performance； 2. Local crystallization in the low-pressure methamine condenser ； 3. The low-pressure scrubber has poor absorption efficiency ； 4. The low-pressure gas pipeline is too small.
Under normal circumstances, it does not start jumping; it may do so when there is carbon dioxide backflow in the stripping tower. Additionally, it might start jumping when the stripping efficiency is too low and the low-pressure system becomes overpressured.
If the width of the sealing surface is too small, it is easy to pass the inspection; however, vibrations in the pipeline can cause problems.
As a supplementary point: 1. Low methanol temperature or blockage due to phase crystallization; 2. Insufficient absorbent liquid; 3. Air leakage; 4. Inadequate stripping; 5. Sudden discharge; 6. Low-level water surge; 7. Problems with control valves and instruments
I think there are also: 1, low vapor phase temperature during decomposition, and high concentration of the reflux liquid. 2. The amount of process fluid added is too small. 3. There is a problem with the expansion tank.
Actually, regarding the activation of the safety valve in the urea cycle system, the points mentioned by those above are quite comprehensive; I would like to add a few more points here: 1. Local crystallization in the low-pressure scrubber leads to gas diversion, resulting in poor scrubbing efficiency. This causes the circulation pressure to rise rapidly, thereby triggering the activation of the safety valve for the circulation system； 2. The low-pressure washer circulation pump fails, or local crystallization occurs in the low-pressure washer circulation cooler, resulting in a decrease in the amount of cooling fluid circulating and an excessive rise in circulation pressure, which causes the safety valve to activate ； The above two points are for reference only!