7- The feather leaf separator demister is used in the inlet section design of the PSA hydrogen recovery system in DCC/FCC units
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This post was last edited by luoli519 on 2020-1-4 at 10:52. The friend’s company has two reforming units; later, a PSA unit was installed for hydrogen recovery and purification. However, since the amount of C5+ liquid hydrocarbons in the feed gas to the PSA unit exceeds 5% by a large margin, and sometimes even reaches 15%, a significant amount of these liquid hydrocarbons end up being carried into the PSA tower system along with the gas flow, even into the bubble columns. As a result, the service life of the PSA adsorbents is shortened, and the operational and maintenance costs increase. Please discuss how the hydrogen recovery and purification systems in the reformation units you have seen prevent liquid from entering the tower along with the PSA feed gas Or methods and suggestions for similar devices to eliminate liquid droplets entrained in the gas phase? The company hopes to carry out technological upgrades, and it seeks the support and assistance of fellow enthusiasts by sharing their opinions and suggestions for reference.
Re-contact during reformation; add ammonia cooling to the feed line
There is re-contact in all cases; it is definitely a result of domestic manufacturing processes – specifically, the \"reduction of re-contact design and reliance on PSA purification\". This approach enhances the cooling effect of ammonia, reduces the temperature of hydrogen, and requires the use of additional vapor-liquid separation tanks. If there is only one stage of re-contact, it might be advisable to add another stage to improve the absorption of liquid by the oil and gas
Domestic processes weaken the recontact design, resulting in a hydrogen purity from reforming as low as 85% (V); this causes severe liquid entrainment in the gas phase. Poor operation and excessively high temperatures can even lead to the presence of C5 compounds, in addition to the impact of seasonal temperature variations.
This post was last edited by luoli519 on 2023-10-3 18:08. Yes, the connection is very weak again. Ammonia cooling has been added to lower the intake air temperature, but the amount of liquid mist in the intake air has not decreased; in fact, it shows an increasing trend. The design institute recommends installing a set of vane separators on the inlet pipeline of the PSA unit to remove over 99% of the liquid mist carried in the incoming gas. Renovation investment offers good cost-effectiveness. What do you all think?
Ammonia cooling has been used to lower the inlet temperature, but the amount of liquid in the inlet stream has not decreased; in fact, it shows an increasing trend. This is normal, as more liquid phase condenses, and the liquid separation tank after ammonia cooling likely does not provide adequate vapor-liquid separation (process calculations can be carried out for the liquid separation tank). The design institute recommends installing a high-efficiency vane-type vapor-liquid separator on the inlet pipeline of the PSA unit; in essence, this is a way to ‘fix’ the problems of the liquid separation tank, and it is expected to yield significant results. However, the actual effectiveness depends on factors such as funding, available space at the site, and the scale of the modifications required.
This post was last edited by luoli519 on 2023-10-3 at 18:09. They already had PSA air intake heat exchangers, but the refrigeration performance of the chiller unit was not satisfactory, with the temperature of the cooled air stream remaining around 30–40°. The factory is hesitating as to whether to consider adding only a vane separator, or installing an additional refrigeration unit, or both an additional refrigeration unit and a vane separator I believe the function of the vane separator is to capture the liquid hydrocarbon droplets in the airflow ； However, if the gas stream temperature is high and the hydrocarbons exist in gaseous form within the hydrogen stream, it is necessary to first use a refrigeration unit to condense the gaseous hydrocarbons into liquid hydrocarbon droplets, which are then captured by a vane separator. With a very low hydrocarbon content in the PSA inlet gas, operation proceeds smoothly. Please help everyone consider whether it is safe.
This post was last edited by luoli519 on 2023-10-3 at 18:09. Additionally, the following professional discussion posts published by NOVEL Nuowei Energy Technology Company on the Hainan Chemical Industry Forum are listed here for everyone to use as links to join the discussions: 14. Regarding the issues arising from the use of swirl tubes/swirl plates demisters in the wet flue gas desulfurization process in boilers, please visit http://bbs.hcbbs.com/thread-1599605-1-1.html to participate in the discussion. 15. For discussions on the selection of separation internals for the gas-liquid separators in the gas distribution units of natural gas projects, please visit http://bbs.hcbbs.com/thread-1598340-1-1.htmll to participate in the discussion.
This post was last edited by luoli519 on 2023-10-3 18:09. 35. Discussion on the removal of liquid sulfur foam in SO2 from the sulfur dioxide production unit of the sulfolane plant: http://bbs.hcbbs.com/thread-1616252-1-1.html.
37. Regarding the application of the C4 hydrocarbons/water coalescing separator in the MMA methyl methacrylate project, please visit http://bbs.hcbbs.com/thread-1617142-1-1.html to participate in the discussion. To be continued......
This post was last edited by luoli519 on 2017-1-16 at 11:39. For discussions on measures for removing liquid droplets from the flue gas resulting from the mixed combustion of waste gas from chlor-alkali plants and coke oven gas, as well as for heat recovery and cooling processes, please visit http://bbs.hcbbs.com/thread-1617257-1-1.html.