The fate of the liquefied gas coming out of the liquefied gas desulfurization tower and passing through the liquefied gas amine separation tank

This post was last edited by ylb913 on 2016-3-1 at 11:30. Substandard liquefied gas means it fails the desulfurization test. We do not have any lines of liquefied gas that are unqualified after desulfurization. Normally, only during plant overhauls when operations are halted might some unqualified liquefied gas be produced. When liquefied gas is not subjected to desulfurization and dewaxing, it is sent to the tank area, where pumps are used to supply it to the gas separation unit; if it is unqualified, it can be stored in a separate tank, and it can be reprocessed once operations resume. In fact, the process before us remains quite complex, with the specific details as follows: 1. There is a bypass line before liquefied gas enters the facility and after it exits; this was part of the process when there was no liquefied gas desulfurization unit, and it is still in use today. Mainly, after the desulfurization unit stops feeding, the cross-line is opened when needed; we don’t need to interfere with how the upstream catalytic unit handles things. At present, this line feeds into the liquefied gas tank area separately; in the event that any abnormal issue arises with the desulfurization unit and it is necessary to cut off the feed, it also provides an outlet for the upstream units (unqualified line 1). Additionally, this is also an outlet for pressurized liquefied gas when the liquefied gas desulfurization process in my workshop is shut down separately; the raw material for liquefied gas desulfurization and hydrodesulfurization isn’t limited to just this source. 2. Currently, the desulfurized liquefied gas is fed directly through a separate pipeline into the liquefied gas desulfurization and dewaxing unit. The liquefied gas at the inlet of this unit can be routed to the liquefied gas storage area through another pipeline (the ‘unqualified flow line 2’). There are also times when the liquefied gas desulfurization and dewaxing unit has to be shut down temporarily, and the main reason for this is salt formation due to alkali solutions. 3. Currently, the liquefied gas is supplied directly to the gas separation unit; however, there is also a pipeline from the liquefied gas desulfurization and dehydration unit that leads directly to the tank area (path 2 for unqualified gas). The gas separation unit can also be shut down separately. Additionally, this is also the outlet for liquefied gas that is pushed by water when the desulfurization and dehydration unit is shut down; in such cases, some of the liquefied gas that has not undergone desulfurization and dehydration cannot be sent to the gas separation unit.

Substandard refined liquefied gas means it fails the desulfurization test. We do not have any lines of liquefied gas that are unqualified after desulfurization. Normally, only during plant overhauls when operations are halted might some unqualified liquefied gas be produced. When liquefied gas is not subjected to desulfurization and dewaxing, it is sent to the tank area, where pumps are used to supply it to the gas separation unit; if it is unqualified, it can be stored in a separate tank, and it can be reprocessed once operations resume. In fact, the process before us remains quite complex, with the specific details as follows: 1. There is a bypass line before liquefied gas enters the facility and after it exits; this was part of the process when there was no liquefied gas desulfurization unit, and it is still in use today. Mainly, after the desulfurization unit stops feeding, the cross-line is opened when needed; we don’t need to interfere with how the upstream catalytic unit handles things. In front of this line is a separate route leading to the liquefied gas tank area; in the event that any abnormal issue arises with the desulfurization unit and it is necessary to cut off the feed, this also provides an outlet for the upstream units (unqualified line 1). Additionally, this is also an outlet for pressurized liquefied gas when the liquefied gas desulfurization process in my workshop is shut down separately; the raw material for liquefied gas desulfurization and hydrodesulfurization isn’t limited to just this source. 2. Currently, the liquefied gas is fed directly to the liquefied gas desulfurization and dewaxing unit through a separate pipeline; the liquefied gas at the inlet of this unit can be routed to the liquefied gas storage area via another pipeline (the \"unqualified flow line 2\”). The liquefied gas desulfurization and dewaxing unit also needs to be shut down temporarily from time to time, and the main reason for this is salt formation due to alkali solutions. 3. Currently, the liquefied gas is supplied directly to the gas separation unit; however, there is also a pipeline from the liquefied gas desulfurization and denaturation unit that leads directly to the tank area (path 2). The gas separation unit can also be shut down separately. Additionally, this is the outlet for liquefied gas when the plant is shut down due to water accumulation, as gas cannot be sent to the gas separation unit in such situations.

That means we’re not taking into account the situation where desulfurization is unsuccessful under normal operating conditions; it’s only the case that under certain abnormal conditions (such as during startup and shutdown periods), liquefied gas with insufficient desulfurization levels is produced. This defective liquefied gas needs to be stored in a separate tank for defective liquids, right?

It’s best to go through desulfurization again, and then to the tank area

Hello, may I ask to what extent can liquefied gas be desulfurized using MDEA lean solution? Can 20mg/m3 be achieved?

20 is the amount of H2S in the liquefied gas

For a question like yours, I think even if someone saw it, they wouldn’t know how to answer you. Do you know the control parameters for liquefied gas products?