Frequent leaks in the synthetic ammonia superheater
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The superheaters for ammonia synthesis in our company experience frequent leaks; they start to leak after a short period of use. Inspections have revealed numerous cracks in the tube sheets. Could experts among you analyze what the main causes might be?
What superheater? Where is it?
Steam superheater at the outlet of the synthesis tower
I’m not sure about the specifics; I can only offer some ideas. Is there a large difference between the design and actual operating conditions, and are the operating conditions subject to frequent fluctuations? Are the imported and exported materials up to standard?
The exit temperature of the synthesis tower is between 200°C and 350°C, the pressure is less than 31.4 MPA, and the media involved are hydrogen and nitrogen, as well as gaseous ammonia. Use pipes made of 10MoWVNb or 12SiMoVNb material, in one direction
It’s also an exchanger at the outlet of the synthesis tower; due to severe leakage, two units of such exchangers were replaced quite early on. Are your heat exchangers also U-tube type?
Imported, BORSIG, Topso process; it has been in use for the 7th year now. For technical exchanges, add WeChat: 15029130359
Check if the level of the superheater fluid has reached the bottom Even just once, high pressure can easily lead to problems; check as well whether there is overpressure in the operation Topsoe does a great job, but their products are too expensive. The main materials aren’t available domestically. Shanghai Sensun also does a good job