Why is the liquid level in the regenerated lean liquid storage tank continuing to rise? Measures?
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Sulfur recovery capacity of 20,000 tons per year, with centralized regeneration; currently, the liquid level in the lean liquid storage tanks is increasing while the concentration is decreasing. All relevant pipeline heat exchangers have been checked, and it can be confirmed that leakage is not the cause. What exactly causes the increase in the liquid level in the storage tank? It must be water that has entered. By the way, the temperature after cooling in the quench tower is 50 degrees; so could it be that the exhaust gas at 50 degrees entering the absorption tower is the cause of this issue? I hope experts can give me some advice! ! ! !
The temperature after quenching is 50°C, which indicates that the temperature of the gas exiting the quench tower is too high and it contains a large amount of saturated water. During the absorption reaction in the exhaust gas absorption tower, this large quantity of saturated water in the gas gets condensed and enters the amine solution system, resulting in a decrease in the concentration of the amine solution and an increase in the liquid level in the system.
The owner has set the temperature at the top of the cooling tower too high; this is also detrimental to exhaust emissions. The moisture in the process gas ends up in the amine solution, so it is recommended to keep that temperature below 40 degrees.
That’s the cooling efficiency of the current quenching system; are there any other ways to lower the liquid level?
I’ve heard of the process of removing water from lean liquid before; does anyone know how it’s done exactly?
There is a line from the outlet of the regenerator top reflux pump leading to the acidic water stripping system, through which water can be discharged.
There must be such a design for the recycled slurry return; we also flushed out water.
What does centralized regeneration mean? Is the amine-rich liquid from sulfur recovery off-gases combined with the amine liquids from other units for regeneration? Have the heat exchangers of the related equipment been checked? Regarding the temperature after cooling in the quench tower, 50°C is a bit high, but I don’t think it will have such a significant impact. It is recommended to check whether there are any significant changes in the amount of acidic water delivered during this period
Is there a leak in the steam generator for the exhaust gases? Steam at 0.4 Mpa enters the exhaust gases, causing their temperature to rise; has there been a decrease in the amount of steam produced by the steam generator? The steam pressure can be appropriately reduced to increase the heat absorbed by the deoxygenated water, to see if this can lower the temperature.
The high exit temperature of the quench tower is the main reason for the increase in the total amount of amine solution. Our situation is the same as what was described by the original poster: the exit temperature of the quench tower is 45 degrees, and the total amount of amine solution keeps increasing while its concentration keeps decreasing. We concentrate the amine solution by using the line that returns acidic water to the tank via the regenerator top reflux.