Taboos of hydrogenation reactors
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When maintaining or loading the hydrogenation reactor in our facility, it is strictly prohibited to leave metal objects such as bolts and hammers inside the reactor. It is also not allowed to use steel pipe scaffolds for working inside the reactor; only bamboo scaffolds may be used. Could everyone please explain why this is the case?
Hydrogen embrittlement – can screws, hammers, and similar items survive exposure to hydrogen under high temperature and pressure? The same goes for scaffolding.
Primarily, it is the hydrogenation reactors that are made of high-strength, heat-resistant steel. Hammers and screws can get trapped inside these reactors. Once the equipment starts operating, the gas flowing through it causes the hammers and screws to collide with the interior surfaces of the reactor, resulting in localized stress and cracks. Similarly, steel pipe scaffolds can suffer damage from collisions with the equipment during installation or disassembly, which also leads to localized stress and cracks in the equipment
:Lol, why do you even need to ask? Just like how gauze, scissors, scalpels and such can remain inside the body after surgery?
This issue has not been fully discussed yet; I hope everyone will continue to talk about it
I think Wen Bing upstairs put it very vividly, hehe
I was fortunate enough to climb into a hydrogenation reactor during a maintenance period. The inner surface of the hydrogenation reactor is lined with a stainless steel weld-on layer, and the integrity of this weld-on layer is crucial for the safety of the reactor. The reason why a steel frame cannot be used is likely to avoid damaging the weld-on layer.
Hydrogenation reactors generally use composite materials, with the outer shell made of high-strength heat-resistant materials and the inner wall lined with materials resistant to hydrogen corrosion. Or, a hydrogen-resistant material can be cladded on the metal substrate to enhance the material’s resistance to hydrogen corrosion. Therefore, ensuring that the lining material remains undamaged is key to guaranteeing the reactor’s service life. The specific operating and usage requirements become clear as well.
Wen Bing – that’s a very vivid way of putting it; the latter is intended to create stress in certain areas, thereby inducing cracks
This post was last edited by Benbenxuan on 2009-7-17 at 16:55. I’d like to add that after any equipment maintenance, it is not allowed for any unnecessary components to remain. Because if they fall from the bottom of the device, it can cause fatal damage to the pump. Secondly, prohibiting the use of scaffolding is intended to prevent damage to the lining layers (non-metallic materials, acid-resistant bricks, stainless steel cladding, precious metals). Although such damage can be detected using methods such as electrical spark testing, PT, and MT and repaired thereafter, why not prevent it from occurring in the first place? Also, there’s the local stress resulting from impact under the action of gases, as mentioned above; I think it would be better to refer to this as mechanical damage or fatigue damage.
I think it’s mainly to avoid damaging the surface surfacing layer.