What is the purpose of injecting water at the top of the tower?
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What is the purpose of injecting water at the top of the tower? Corrosion inhibitors are already added at the top of the tower; is it still necessary to add water as well?
Ammonium chloride is formed after ammonia water is injected; it remains solid at temperatures below 350 degrees. In the presence of hydrogen sulfide, this substance can cause corrosion beneath scale formations. Therefore, injecting water can help dissolve the ammonium chloride solid and prevent scale formation, thereby reducing corrosion. Another option is to inject water along with the corrosion inhibitor, as the inhibitor may be water-soluble
I heard from the masters that in the past, alkaline water was used for injection, as this could neutralize the acid at the top of the tower and reduce corrosion
Generally, ammonia water is used for corrosion prevention, but nowadays corrosion inhibitors are mostly used!
Depending on the crude oil processed by each unit, the substances injected may vary, but generally water and corrosion inhibitors are injected to reduce and prevent sulfur corrosion in low-temperature areas
I learned new knowledge, hehe~
For process corrosion protection in our company, water-soluble neutralizing and corrosion-inhibiting agents are used, with the concentration adjusted appropriately. Its specific function is to dilute the HCl concentration and raise the dew point. For a detailed mechanism, refer to the function of “one removal and three injections”
Currently, neutralizing and slow-release agents are used in the manufacturing process. The amount of these agents is adjusted according to the volume of production; through laboratory analysis, it is sufficient to reduce the iron ion content in the water to meet the specified standards, and the pH level does not necessarily need to meet specific requirements.
Top-water injection is used to prevent scaling, ammonia (or amines) injection is used to neutralize acidic gases, and corrosion inhibitors are used to reduce corrosion. All three are essential; the injection pipeline depends on the specific substances used in each facility.