Let’s discuss whether it is necessary to have two filters in the methanol washing process
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As the title suggests, is it necessary to install two filters in the methanol circulation loop? Let’s talk about the cold zone and the hot zone separately. If two cold zones are set up, what is the state of the backup after it has been cleaned? Pressurized at cold temperature? What state is it still in? Has any company done this before?
After cleaning the backup filter, open the inlet valve to fill it with fluid, ensuring it is ready for use at any time in a cold state!
The filters in the cold zone are primarily used to filter out coal dust, catalyst dust, particles, and other impurities coming from the previous system. Two filters are installed as a backup for each other, to prevent these impurities from clogging the coil-type heat exchangers and thus to protect them! !
What the poster means is to install filters in the cold zone and the hot zone respectively, right! I believe it is necessary to set this up, as it will provide more effective protection for the safety of the system (especially coil-type heat exchangers) as well as ensure its proper operation. The backups should be in both cold and hot standby modes, so that they can be activated at any time. The above are purely my personal opinions; please feel free to correct me!
Look at the craftsmanship! If the volume of process gas to be treated is large, use two! The media that the two filters mainly filter are different! The cold zone is mainly used to filter ammonia sulfide and ammonium carbonate from methanol! ! The filters in the hot zone are mainly used to remove impurities such as iron sulfide and nickel sulfide from methanol! That’s why the mesh sizes of the filters are different! After cleaning the filters in the cold zone, it is essential to ensure that they are ready for use in cold conditions at any time! It should be kept in a fully liquid-cooled state
By \"cold zone,\" you mean the process of removing ammonium sulfide and ammonium carbonate from methanol. How are ammonium sulfide and ammonium carbonate formed? Can ammonia sulfide and ammonium carbonate be formed in such a cold methanol environment?
In one Lindner low-temperature methanol wash unit I have seen, two filters were installed at the pump outlet at the bottom of the 3rd tower, one in use and one as a backup; they needed to be cleaned very rarely； Two filters are installed at the outlet of pump 6 at the bottom of the 4 towers, one in operation and one as a backup; they need to be cleaned frequently, especially during startup ； A filter is installed at another outlet at the bottom of the 4th tower; it is cleaned frequently, mainly to reduce the number of times the filter at the inlet of pump 5 needs to be cleaned ；
It is necessary to set up one in operation and one as a backup; regular cleaning and switching are required to ensure normal production.
Two must be installed, one in use and one as a backup, to ensure that inspections and cleaning can be carried out at any time, thus guaranteeing that the medium entering the coil heat exchanger remains clean. Otherwise, once the pipe gets clogged, it’s impossible to clean it, and one has no choice but to buy another one from foreigners.
The filters installed at the pump outlets at the bottom of the 3 towers serve mainly to filter out coal ash, particles, and catalyst dust that come from the previous system during startup. During normal operation, they are used to filter out substances such as iron sulfide, iron carbonyl, and nickel carbonyl, thereby preventing corrosion of the equipment. It also improves the heat exchange efficiency of coil-type heat exchangers, of course. The filters at the pump outlets at the bottom of the 4 towers are primarily used to filter out sulfides, iron sulfide, and nickel sulfide; citric acid is generally used for cleaning them. In the past, Nanhua installed a filter at the bottom of V401 as well, but that has been removed now. This is just my personal understanding – please feel free to correct me if I’m wrong
Why not install one at the methanol outlet of the separation tank at the inlet of Tower 1? After all, most of the catalyst powder carried in by the shift gas, as well as the vaporized dust and carbon black, will be separated out in V101! Why not set it up? If it’s not set up, the 5 towers will get dirty easily! 【Although switching out 5 towers for cleaning will not affect production】
Having an extra setting is definitely beneficial... it allows the system to filter out more impurities... For better production, it’s certainly necessary