In the urea production process using the full-circulation aqueous solution method, when should Solution A be added after a short shutdown?
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After a short shutdown during urea production using the full-cycle method, what load level should carbon dioxide be introduced at? And how often should methylamine solution be added?
After a short pause, start the operation: first, introduce ammonia for about 3 to 5 minutes in order to reduce the amount of water at the bottom of the tower and lessen corrosion after feeding the material; then introduce carbon dioxide gas; finally, feed in methyl alcohol.