Reasons for the non-compliance of oxygen and nitrogen levels in air separation units
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The air separation unit of a coal-to-gas project has passed both individual and combined tests, its performance evaluation has been completed, and it has been successfully handed over to the production workshop. However, after the trial production of the entire coal-to-gas project, the designed capacity was never achieved; the output of oxygen and nitrogen also failed to meet the specified standards. All possible causes were investigated, but the problem could not be resolved.
It would be best to describe in detail the specific issues with the device to facilitate discussion; thank you.
This post was last edited by Zhizhi Ming on 2023-9-8 at 16:03. An issue was identified during the design review: there were mistakes in the overall layout. The location chosen for the air separation unit was inappropriate, as it is situated in the center of the entire plant. To the east lies the thermal coal storage area, to the west are the methanol and purification facilities, and to the north is the gasification plant. No matter how the wind direction changes in the future, this will have a negative impact on the operation of the air separation unit, resulting in air that does not meet the required standards.
In accordance with Article 4.2.5 of GB50183 \"Code for Fire Protection Design of Oil and Gas Engineering\", air separation plants should be located in areas with clean air, and it is advisable to place them downwind of the direction from which acetylene and other flammable gases as well as dusts are emitted, considering the wind direction with the lowest frequency of occurrence throughout the year.
The defect could no longer be fixed, so in the end the air intake was raised by 20 meters; the difference isn’t significant, but it’s better than nothing. The project management team of the client for this project consists entirely of people who used to work in coal mines and lack experience ； As for Party B, to put it bluntly, it’s a bit like bullying.
This is when the importance of the general layout discipline becomes evident
Yes, the landscape design discipline is not highly regarded in the institute on a daily basis, but its expertise really comes to the fore in large-scale projects and regarding many details.
If the levels of harmful elements are excessive, it is correct to say that the site selection for the project was inappropriate. If the yield and purity do not meet the standards, it is a problem with the design or with the adjustment methods used.