N-gas displacement
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The ammonia ball tank for the replacement fluid is first purged of air with nitrogen to prevent the formation of explosive gases, and then the nitrogen is replaced with evaporated ammonia. Waiting for everyone to stay tuned! Discussion!
The poster is referring to the replacement procedure for liquid ammonia tanks that have just started operation; if it is a replacement for liquid ammonia tanks that are already in use, then it is not this procedure.
Reply to 2# Yan Qiusheng: That’s right. Our plant was built just one year ago; it has a capacity of 300,000 tons per year for synthetic ammonia production, and 330,000 tons per year for urea production. Any advice you could give would be appreciated. What is the procedure for replacement after driving it?