Regarding pressure swing adsorption, what is the difference between the 8-2-3 and 10-2-4 options?
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Regarding pressure swing adsorption, what is the difference between processes 8-2-3 and 10-2-4? If one can choose 8-2-3 (8 towers, 2 adsorption steps, 3 pressure equalization steps), or 10-2-4 (10 towers, 2 adsorption steps, 4 pressure equalization steps), what are the differences in terms of capital investment, energy consumption, and operating costs? Manager Discussion Group
If it’s 12 towers, what is the operation sequence: 12-3-7?
There is a difference in the gas processing capacity between 8 towers and 10 towers; the choice of the number of towers depends mainly on the required gas processing capacity. The normal operating pressure is 4 times evenly above 2 MPa, and 3 times below 2 MPa.
For the same processing capacity, with a one-time investment, the cost of 10 towers is higher~~ but having 10 towers allows for additional pressure equalization, which increases the product yield by 2~5%~~ However, as the number of pressure equalization steps increases, the increase in product yield slows down; it then depends on whether it’s worth it or not~~
12-4-4 or 12-2-5
We have 7 averages; the operation mode wasn’t specified, and the information is incomplete
8-2-3 or 10-2-4 should be the chosen purge processes; both are schemes involving two columns for adsorption. Under the same design conditions, if the column diameters are identical, the processing capacity will be the same. If the operating pressure is greater than 2 MPa and high purity as well as high yield of the effective gas are required, a 10-column setup can be considered; otherwise, an 8-column setup is appropriate. There should be no significant difference in operating costs. Additionally, with the same amount of adsorbent used, the energy consumption (and effective gas loss) of the 10-column setup should be lower.
The number of columns required is primarily determined by the volume and pressure of the gas to be processed. To increase the yield at a certain operating pressure, it is necessary to carry out as many pressure equalization steps as possible, while ensuring the pressure after each such step; this requires an increase in the number of columns. As the owner, one should not choose the option with the lowest price alone – from a long-term perspective, carrying out an additional pressure equalization step or two will result in lower operating costs.