Regarding the PSA Cheta issue
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There is an existing hydrogen production PSA, model 8-2-4. T1:110。 T2:70。 T3:30。 T4:27。 T5:30。 T6:35。 What are the procedures and precautions for switching from 7 towers to 6 towers, from 6 towers to 5 towers, and from 5 towers to 4 towers? There are a bit too many questions; I hope fellow sailors can share their understanding of Cheta. Points are given for answers; those that hit the mark receive flowers, and those who help solve the problem get the best rating.
Is it too late? The experts must be asleep already.
Isn’t PSA automatic pressure swing adsorption based on a numbered sequence, followed by processes such as flushing?
When the programmable valve of a tower malfunctions and affects the operation of the entire tower, it is necessary to isolate that tower and then repair the programmable valve.
Cutting off the tower continuously is not allowed; depending on the operating load of the number of towers specified by the manufacturer, it is necessary to first reduce the load to control the amount of gas released and adjust the adsorption time accordingly. During the Cheta phase, reverse operation is chosen to prevent the furnace from overheating. Without hand valves, it is difficult to properly isolate the cut tower, which poses a great risk. It is recommended to park the vehicle and check all the programmable valves; all 4 towers are leaking internally, and the same situation holds for the others as well. Additionally, consider adding a manual valve
The 4-tower mode corresponds to a 4-1-2 operation pattern, while the 5-tower mode is 5-2-2. Two adsorption towers are combined into one; at this point the capacity of the system is reduced, and fluctuations occur significantly. The hydrogen production will first decrease before increasing again. It is also necessary to adjust the adsorption time in order to maintain a constant pressure, as well as the set points of the control valves. After switching to the 4-tower mode, it is important to monitor the operation to ensure it proceeds normally; if any abnormalities occur, the PSA unit should be shut down immediately. Device large cycle!
Reduce the number of towers from 8 to 5; it is not allowed to shut down two towers in succession. Towers can only be switched off after normal operation is achieved, and at the same time the adsorption time as well as the upper and lower limits need to be adjusted. The operating mode should be 7-2-3.6-2-2.5—2-2! The fluctuation of 5 to 4 towers is a bit large; it’s fine to adjust the others gradually
According to our data, the Cheta transformation pattern is 8-2-4. 7-2-3. 6-2-2. 5-1-2. 4-1-2.
Currently, there are no detailed operating procedures for changing from 7 towers to 6 towers, from 6 towers to 5 towers, or from 5 towers to 4 towers; only some general guidelines are available. When it’s time to switch between towers, it’s not clear what adjustments need to be made for T1 to T6, nor how those adjustments should be carried out.
When it cuts to five towers, does only one tower operate? In any case, you need to be aware that after switching from one adsorption tower to another, there are significant fluctuations in hydrogen levels; these fluctuations first decrease significantly before gradually returning to normal
Follow the Cheta operating procedures – ensuring equal voltage distribution is sufficient; this is based on practical experience, as there are no fixed procedures. Here’s the method: just make sure that the voltage distribution is equal each time