Problems with the hydrogen desulfurization tower in diesel hydrogenation processes
Thread Content
What is the force that drives the lean liquid to flow toward the top of the circulating hydrogen desulfurization tower through the trays inside it after entering the tower? Rely on pressure difference? The pressure difference is almost 0 ； Will the liquid in the desulfurization tower not overflow? ； Does this lead to a low level of fluid in the posterior compartment that is difficult to maintain? What’s the reason?
How can the lean liquid flow towards the top of the tower? The lean liquid flows to the bottom of the tower, where it absorbs sulfides – specifically hydrogen sulfide – and becomes rich liquid that is sent to the regeneration unit. At the top of the tower there is a liquid separation tank; why is it necessary to maintain a certain liquid level? Do you want to cause a cylinder collision accident due to liquid at the compressor inlet?
The lean amine stream enters from the top, while the recycle hydrogen enters from the bottom. Ensure that the inlet temperature of the lean amine solution is higher than that of the circulating hydrogen, to prevent foaming in the hydrocarbon-containing lean amine solution.
It must be that the process sequence is incorrect; the lean liquid enters from the top of the tower and moves downward to the bottom, where it comes into contact in the opposite direction to the cyclic hydrogen that enters from the bottom. The occurrence of liquid carryover is usually due to foam formation in the lean liquid or an excessively high gas velocity
We’re facing a problem: the level in our desulfurization tower, the flash tank behind it, and even the level of the solvent regeneration liquid has all dropped. We don’t know what’s causing this
So, will there be any changes in the path ahead for poor-quality liquid? Is there a leak in the liquid vent line of the desulfurization tower? Does the liquid separation tank at the top of the tower have an increased frequency of liquid discharge? Is it foam caused by lean liquid? Has the amount of recycled hydrogen increased? All of these need to be taken into consideration
The direction is reversed; the lean amine liquid enters from above and exits from below. Better contact and reaction of H2S in countercurrent flow and recycled hydrogen
The flow of the lean liquid into the tower and that of the recycled hydrogen involve a reverse absorption process; it descends to the bottom of the tower due to gravity, and possibly, due to an excessive amount of recycled hydrogen or incomplete adsorption, it ends up in the liquid separation tank downstream.
Too high a velocity of the circulating hydrogen, or an excessive amount of it, causes amine leakage! Posterior reinforcement and fluid removal. It’s also possible that there is a problem with the internal components of the lean amine column – the foam breaker net may be damaged!
After actual assessment, it was determined that there was liquid present. We then increased the amount of circulating hydrogen as well as the temperature, and directed the oil to the liquid separation tank at the compressor inlet; eventually, the liquid level returned to normal
Our amount of lean liquid is 40； Control 27 ； Cyclic hydrogen flow rate: 7000 at maximum, 10000 ； There are many light hydrocarbon oils, and they are switched over every shift; I don’t know why