Treatment of weld leakage in the second water separation tank of the natural gas-to-hydrogen plant
Thread Content
In our company’s 5,000 standard cubic meter hydrogen production plant, there are multiple leaks at the welds of the second water separation tank in the intermediate gas processing section. Recently, an emergency response plan was developed to deal with sudden breaks in these welds, which lead to large-scale gas leaks. Experts, please share your opinions on the best way to handle such situations One more question: For the PSA hydrogen purification unit, the analyzed hydrogen content is 38%, the T3 time is 220 seconds, and the hydrogen purity is 5 nines. Can T3 be increased further?
Implement emergency shutdown procedures to bring the site under control. Hydrogen is 99.999% pure – is there any mass excess?
Then we can only halt operations urgently; our T3 unit can operate up to 240 seconds at most
This post was last edited by scs20040415 on 2011-2-27 at 11:22. Emergency shutdown measures should be taken; the T3 time can be extended, and the purity of the hydrogen gas used in the reaction can be reduced to around 30%. A higher purity of hydrogen results in too low a yield
There are also leakage points around the welds at the inlet of my buffer tank; we can discuss this if there’s a chance. For QQ 406738618, an PSA adsorption recovery rate of over 90% is considered quite good
Weld crackage caused by device vibration
Leakage due to stress corrosion cracking can be resolved by replacing pipes made of 304 material with 304L or 316L. At present, the design institute has replaced all of the materials in that section with 304L to prevent such issues from occurring.
What is the main medium in the water separation tank that causes corrosion of stainless steel? This phenomenon occurs in many installations; the diaphragms of our double-flange level gauges have been damaged
Medium-pressure gas contains carbon dioxide, and prolonged acidic corrosion after it dissolves in water at high temperatures causes leakage points in the water separation tank.