Cross-line for centralized solvent regeneration across the entire plant and sulfur solvent regeneration
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The amine solution used in the centralized solvent regeneration unit across the entire plant is a composite MDEA solution, while the amine solution used in the sulfur processing unit is an imported, patented high-efficiency desulfurization solvent; these represent two separate regeneration systems. Will it be considered during design to add connection lines at their rich and lean liquid lines respectively? Colleagues, has anyone designed a device in this way? If so, has this process been put into use? Under what circumstances is it put into use, and what are the impacts after it is in use?
We have such a process: when one regeneration tower gets clogged, the other regeneration tower is used for desulfurization.
Thank you, Engineer Yu, for your answer. May I ask, how often does the regeneration tower get clogged? The amine solution containing sulfur is relatively clean, so the possibility of blockage is very low. If it’s the tower for plant-wide regeneration that is blocked, the sulfur regeneration tower is quite small, resulting in a very limited amount of regeneration possible. Is this kind of mixed and borrowed process inappropriate for sulfur regeneration that uses patented imported solvents?
Our designed capacity for sulfur regeneration is 150 tons per hour, while the actual output is just over 100 tons. The designed capacity for sulfur recovery is 70 tons per hour, but the actual output is less than 40 tons. Therefore, there is no problem with concentrating sulfur regeneration in one area. The capacity for centralized sulfur regeneration is indeed insufficient, but it is possible to reduce the amine solution circulation volume in each tower accordingly; the hydrogenation recycle hydrogen desulfurization tower can stop its circulation. We switched back and forth twice last year; it is indeed difficult to operate the small pump while using the large pump, and the pump head pressure is insufficient. Therefore, we made a temporary modification by connecting the outlet of the small regeneration pump to the inlet of the large regeneration pump.
This will contaminate the amine solution used to regenerate sulfanilamide, as impurities such as coke powder end up in the process of regenerating sulfanilamide.