Problems with the hydrogen dechlorination tank in the reformation unit
Thread Content
Hello everyone, let’s discuss the pipeline layout for the hydrogen dechlorination tank in the reprocessing facility. It’s definitely necessary to be able to handle switching and seasonal changes, but is it also necessary to have a function for crossing different lines? It’s just to go over both dechlorination tanks. We’re facing a problem now: the dechlorination tanks in the refinery aren’t equipped with a cross-line connection feature; in other words, there are no valves between the two pipelines that connect the tanks. As a result, hydrogen carrying liquid trapped the dechlorinating agent, causing a high pressure drop. Even when two tanks are used in parallel, the pressure drop remains high. The workshop hopes that having such a cross-line connection would be useful, as it would eliminate the need to use dechlorination tanks. For this process, we simply need to add cross-connections; let’s discuss everyone’s views on this issue.
How could there be liquid in it? Your boosters are way too powerful! The hydrogen chloride content in the reformed product is too high; without dechlorination, it poses a serious threat to downstream equipment!
It’s strange how your containers are designed; mine can definitely be moved across using the usual process, it’s just the connection lines between the two containers in the middle
Replying to the person above: The original setup had a problem – the connection cable between the two tanks was connected after the pressure filling valve
That means you didn’t detect it at the three-way or four-way decision points; there’s nothing to do about it. Just incorporate an additional line into the actual process – but every extra line brings with it an extra level of risk
The only options are to add cross-line valves and shut-off valves. Normally, both high-temperature and low-temperature dechlorinating agents need to be replaced once a year, while semi-regenerative reforming requires the catalyst to be burned out every two years. Since the agents must be replaced at some point, the process flow needs to be taken into consideration; it’s best to use two tanks in parallel, as this reduces the number of replacement procedures and makes the operation more convenient
If there are two dechlorination tanks, I don’t think it’s necessary to add cross-connects; the two tanks can be switched back and forth in use, which allows for the replacement of the dechlorinating agent. After all, the fewer valves there are in the hydrogen-related system pipelines, the better and safer it is
The hydrogen dechlorination tank has cross-connected lines; yours doesn’t have them. Is that a problem with your design? If hydrogen contains oil, is it because the temperature in the regenerator is too high?
The hydrogen carrying liquid in the unit may be due to a problem with the foam breaking screen in the liquid separation tank. It is best not to use cross-line connections for the dechlorination tank, as it causes too much impact on downstream equipment.
When a false liquid level occurs in the recontact tank, it can lead to hydrogen carrying liquid, and the most problematic aspect is the hydrogen lifted from the regeneration section; whereas the hydrogen dechlorination tank can remove the liquid phase through hydrogen stripping. Typically, hydrogen dechlorination systems are designed with two dechlorination tanks operating in series; when the first tank reaches its limit (that is, when the hydrogen chloride levels at the inlet and outlet are almost equal), operation of that tank is stopped. The system then operates with just one tank, and after replacing the dechlorinating agent, the original second tank is placed at the front position while the new one is placed at the back.