On the application of pressure swing adsorption decarburization process
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A few years ago, for energy-saving reasons, pressure swing adsorption technology was adopted in the decarbonization processes of many newly built ammonia synthesis plants. However, are there still many new ammonia synthesis plants built in the past two years that use pressure swing adsorption?
A considerable number of enterprises still use pressure swing adsorption for carbon removal, but few large-scale ones do; new large-scale installations generally opt for low-temperature methanol washing.
As far as I know, this technology is widely used in Hebei and Henan provinces, but it is not widely used in Shandong province. The reason may be that the first use of this technology by the Feicheng Fertilizer Factory in Shandong was not very successful; the factory adopted this technology at an early stage, and the technology might not have been fully developed yet, which led to suboptimal performance. The decarburization of our 70,000 Nm3/h ammonia synthesis system employs pressure swing adsorption technology, which has shown good performance.
I would like to ask the two moderators upstairs: as decarbonization technologies, which one is more advantageous, low-temperature methanol washing or pressure swing adsorption?
From the perspective of energy saving and consumption reduction, pressure swing adsorption is still a good option! It’s just that the initial investment is high
For long-term use, low-temperature methanol washing should be chosen; it provides high gas purification, which facilitates long-term operation of subsequent processes, and there is less gas loss. If a methanol synthesis unit is available, the raw materials can be supplied internally.
Chemical gas purification moderator: Based on your description, compared to low-temperature methanol washing, is the failure rate of pressure swing adsorption slightly higher?
This post was last edited by Chemical Gas Purification on 2010-9-23 at 11:16. It’s not the high failure rate; rather, there is some significant gas loss. The purification level is not as good as that achieved with low-temperature methanol washing.
It is understood that the failure rate of solenoid valves in pressure swing adsorption is relatively high. Judging from the introduction by the moderator in charge of chemical gas purification, it seems that the problem has been resolved?
This post was last edited by lxq700918 on 2010-9-23 at 15:49. It seems that the fault with the solenoid valve isn’t that serious now; the manufacturing precision of these solenoid valves is much better than before.
Our pressure swing adsorption carbon removal unit has been in operation for two years now, and there have been no instances where valve failures affected its performance.