What causes a sudden drop in pressure during production?
Thread Content
Before the pressure drop, the synthesis tower was at a high liquid level (99%). 9%), N/C 0.97, H/C 0.58. Without any ammonia reduction, the pressure dropped suddenly from 14.4 to 13.8; at this point the analysis results were N/C 0.88, H/C 0.5. The pressure in the drum did not decrease, and after the pressure drop the frequency of the ammonium methoxide pump was adjusted slightly. What could be the cause of this situation? Why did the N/C value decrease?
Is there a relationship with the oxygenation of carbon dioxide in the feed gas? ? In other words, is the oxygen addition valve stuck, preventing air from being introduced before dehydrogenation, and does the oxygen level gauge also give inaccurate readings? ? In this case, the purity of the feed gas increases, the load on the system rises, and N\C will definitely decrease. Based on the water-to-carbon ratio, it seems that water has not entered the system. Comrade, how did the systemic pressure increase later on? ? Last edited by Durian on 2009-2-28 19:04]
Since the drum pressure did not drop and the synthesis tower remained at a high liquid level (99.9%), the sudden drop in pressure from 14.4 to 13.8 without any reduction in ammonia supply can be attributed to the following possible reasons: 1. There may have been a sudden decrease in the amount of the three materials entering the high-pressure system, as well as internal leaks from vents, discharge systems, safety valves, etc. 2. Leakage in the high-pressure system; low liquid level in the stripping tower leading to air intrusion; problems with the vapor valves in the synthesis tower and the high-pressure scrubber; leakage in the venting, discharge, and safety valves. 3 Sudden drop in shell-side steam pressure in the stripping tower, explosion-proof spaces, incorrect instrument readings, etc. 4 One can only discuss it in general terms; specific analysis requires comprehensive parameters. One more thing: what does N/C0.97 refer to, as mentioned by the original poster? I can’t quite understand it. This post was last edited by qiwu9981 on 2009-3-9 10:14.]
It’s related to your liquid level; check to see if the level is dropping too quickly.
Poster: Does “N/C0.97” mean “N/C is 2.97”? It’s probably a typo!
A sudden drop in pressure without a decrease in ammonia emission must indicate a change in the volume of gas: 1. This could cause a failure in the compressor, leading to changes in the gas volume； 2. It may be that the amount of CO2 in the previous process has changed, resulting in low pressure at the compressor outlet ； 3. Excessive manual opening of the high-pressure system or sudden activation of the safety vent ； 4. It could also be a fault with the pressure gauge, resulting in false readings.
If it is really “N/C0.97”, has the raw material ammonia supply been interrupted or **reduced?
Either there is a leak, or there is an issue with the indication
Please check carefully when posting the topic; given that the pressure level remains unchanged, it is likely that the ammonium pump suddenly started carrying water, causing the high-pressure vent to open up suddenly
The pressure drops quickly; in my opinion, there are only three possible reasons for this: 1. Instrument distortion, allowing it to drop as fast as it wants. 2. The amount of CO2 decreases, or for some reason the volume of gas in the high-pressure chamber drops suddenly. 3. No anti-corrosion air is added at all, but the operating conditions of the compressor will still change. Sudden increases or drops in pressure can generally only be caused by changes in the gas phase.