The water dew point in the mercury removal tower behind the purification unit in our plant just won’t go down
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Due to an upstream accident, a large amount of water entered the pipelines in our plant; last winter, despite emergency repairs, we were still unable to clear the passage in the cold box. At that time, in order to start production as quickly as possible, we simply used nitrogen for backblowing on the mercury removal tower; however, due to the high water dew point and high moisture content, the mercury removal tower was not put into use. This time we have about 10 days for emergency repairs, but the management doesn’t intend to replace the packing in the mercury removal tower; instead, they want us to use nitrogen to blow through it. Yet 10 days have passed and the water dew point still does not meet the requirements. Do any experts know of ways to lower the water dew point in the mercury removal tower without replacing the packing? Get the mercury removal tower back into operation.
Is there a large amount of nitrogen? Can nitrogen be used for heating? Is it a portable dew point meter or one with DCD remote display? If the tubing is very long, should it be disconnected at one end for a while before reconnecting?
The nitrogen flow rate is not very high; the nitrogen comes from the nitrogen generation unit inside the plant, with a flow rate of around 300 cubic meters per hour. The factory also has heaters, but since they are located far from the mercury removal tower, the heat is lost due to the pipelines and external air. We use a portable water dew point detector. We also used an extremely extreme method, which involved using thermally regenerated natural gas to purge the mercury removal tower. This makeshift approach was effective, but it did not fully restore the function of the tower.
At the moment, we are not using the bypass that goes around the mercury removal tower. Our feed gas basically contains no mercury, but we are concerned that if there are any changes in the gas source and mercury appears, the plate fins in the cryogenic box will corrode due to the absence of mercury removal.
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