Changes in the properties of crude oil
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Our device is a normal and vacuum device, and ammonia is injected at the top of the tower. Does the change in the properties of crude oil affect the amount of ammonia injected at the top of the tower?
Ammonia injection at the top of the tower is mainly to balance the phase balance of NH3-HCl-HS-H2O. In order to prevent corrosion, the properties of the crude oil change and the phase balance is destroyed. The amount of ammonia injected will definitely have an impact!
Ammonia injection is based on the formation of acid corrosion based on the salts in the raw materials.
Ammonia neutralizes acidic ions in oil, such as HS, HO, HCI, etc. It has no effect on the quality of oil.
It is recommended to strengthen ph monitoring at the reflux tank. After each oil change, make timely records according to the mixed oil analysis. After changing the oil, you will know the approximate amount of ammonia injected. Without a quantitative method, you can only explore.
As the properties of crude oil change, the amount of ammonia injected should also change accordingly. Generally, the amount of ammonia injection can be adjusted according to the PH value of the condensed water in the reflux tank, and controlled between 7 and 9.
As the properties of crude oil change, the amount of ammonia injected must also change. Just adjust the amount of ammonia injection according to the change in the pH value of the condensed water in the reflux tank.
As the properties of crude oil change, the amount of ammonia injected should also change accordingly. Generally, the amount of ammonia injection can be adjusted according to the PH value of the condensed water in the reflux tank, and controlled between 7 and 9.
There is a change. The acid value of crude oil has changed.
The acid value in crude oil is mainly contributed by naphthenic acid. Ammonia injection at the top of the atmospheric pressure tower is mainly to prevent or slow down the corrosion of Cl ions at the top of the tower. The source of Cl ions is thermal hydrolysis of chlorides in crude oil, such as sodium chloride, magnesium chloride, etc., as well as pyrolysis of some organic chlorines. Changes in the acid value of crude oil have little effect on ammonia injection at the top of the tower. Pay attention to the desalination effect of electric desalination and strengthen the measurement of the Ph value of the top sewage.
As the properties of crude oil change, the amount of ammonia injected must also change. We control the PH value of the condensate water in the reflux tank, but sometimes just injecting ammonia is not enough. When the corrosion on the top of the normal pressure tower of our company is serious, we can control the PH value of the condensate water by adding a small amount of alkali and injecting preservatives. Analysis shows that strong acid is generated in the gas phase at the top of the tower, for reference only.
It definitely has an impact. Strengthening monitoring and making appropriate adjustments can effectively slow down equipment corrosion.
Generally, the amount of ammonia injection can be adjusted according to the PH value of the condensed water in the reflux tank, and controlled between 7 and 9. Mainly to provide alkaline center for corrosion inhibitor. Form a protective film.
This will definitely have an impact! The purpose of ammonia injection is to remove acid! As the components change, the acid content will also change, which will affect the amount of ammonia injected.
Injecting ammonia can easily cause salt formation on the tray, so it is best to inject neutralizing corrosion inhibitors.
Changes in crude oil properties generally refer to changes in water content and salt content.
Injecting ammonia can easily cause salt formation on the tray. It is best to inject neutralizing corrosion inhibitors. However, corrosion inhibitors are more effective when they are weakly alkaline. Simply injecting corrosion inhibitors will accelerate corrosion.
Generally, the raw material oil contains a large amount of organic and inorganic acids such as sulfur and nitrogen, which will increase the amount of ammonia injected accordingly. Ammonia water generally has a concentration of 3% to 5%, and the amount of ammonia injected is controlled according to the pH value of the condensed water at the top of the tower.
Adjust the amount of ammonia injection according to the acid value of crude oil