The oxygen content in semi-water gas from fixed-bed gas generators is very high
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Dear seniors in the gas production field, I am a new employee who has just started working in this area, and I encountered a problem yesterday. I look forward to your guidance. The details are as follows: The company uses fixed-bed gas generators to produce gas. Yesterday, during the night shift around 21:25, the temperature at the bottom of one of the generators was about 40 degrees Celsius higher than normal. After three or four cycles, the personnel in the subsequent conversion unit reported that the oxygen level had reached 1%, but the oxygen analyzer on our end continued to show a value between 0.34% and 0.36%. Later, when the technicians from the electrical and instrumentation department came to carry out repairs, they confirmed that our instruments were functioning properly. We experienced a grayout around 21:20, and it lasted for about 10 seconds. Upon receiving the notification, the technician on duty immediately went to check all the valves, and their operation was normal. Factors such as other oil pump pressures, steam pressure, and blowing resistance are all normal, as usual. The masters said that based on their past experience, if there is carbon leakage in the furnace, the oxygen level would be high, but not this high; it’s likely that the ash accumulation is the cause. I’m not sure if I made myself clear. Hehe~ May I ask the seniors, is it valid to explain high oxygen levels as being caused by ash? If not, what could be the reason? Please give your advice.
Based on your description, it is caused by the ash falling.
It’s possible that it’s not caused by the deposition of ash; check whether the oxygen analyzer at the shift position is accurate, and also see if there is a tendency for a sharp increase in the temperature of the shift catalyst bed.
Personal opinion: It could be an error in the transformation analysis, or it might be related to whether the furnace was properly purged at the start
The oxygen content in the shift transformation unit reached 1%; is there a large variation in the furnace temperature in that unit? If it’s normal, then it’s a problem with the gauge. This post was last edited by yueyue on 2009-3-29 18:12]
The furnace temperature increased by 80 degrees Celsius all at once
The furnace temperature rose by 80 degrees; that’s way too high. It must be due to an excess of oxygen – the gauge is fine!
If the ash falling is carbon return, then a high oxygen level is completely normal