Disc centrifuge plays a key role in the oil refining process. It separates oil from oil feet or soap feet through the drum and internal discs. However, after long-term operation, disc centrifuges may have scaling problems, which not only affects the separation effect, but also may reduce equipment output and product quality.
Causes of scaling
1. Crude oil quality:
If the crude oil contains more impurities such as oil debris and mud, these impurities are easy to scale on the centrifuge discs during hydration or alkali refining.
2. Water quality problems:
Untreated tap water, underground well water or natural water from rivers and lakes has a high hardness and contains a large amount of calcium and magnesium ions. These ions are easy to scale on the centrifuge discs and water channels at high temperatures.
3. Improper operation and maintenance:
The centrifuge is a reliable and advanced machine that can effectively and thoroughly remove impurities from your materials. However, if the centrifuge does not operate normally or is improperly operated, the slag removal work is not thorough, resulting in the accumulation of solid impurities on the disc. Long-term high temperature operation (such as around 90°C) aggravates the scaling of impurities and inorganic salts on the disc.
Solution
1. Improve the quality of crude oil:
Before the crude oil enters the refining workshop, use effective filtration technology to treat it to ensure that the impurity content in the crude oil does not exceed the specified standard (such as 0.3%).
For pre-pressed crude oil, after the initial cleaning by the slag scraper and oil tank, fine filtration is performed.
2. Improve water quality:
Use softened water or treated water as process water and operating water for the centrifuge.
Equip with separate softening water treatment equipment or use boiler softened water and steam condensate when it cannot be set up separately.
Ensure that the hardness, ammonia ion content and pH value of the water used in the centrifuge meet the specified standards.
3. Optimize operation and maintenance:
Clean the centrifuge regularly, soak it in hot alkaline water before cleaning, and avoid using metal scrapers or metal brushes to avoid damaging the discs and drums.
Set a reasonable slag discharge cycle and instantaneous time according to the quality of the crude oil and the neutral oil content in the oil foot or soap foot.
Regularly check and maintain the slag discharge system of the centrifuge to ensure that the slag discharge work is thorough.
Clean the centrifuge regularly during the intervals between cows, usually once every 1 to 2 months.
4. Other measures:
For the extracted crude oil, use more effective filtering equipment (such as mixed oil filter) for initial filtration to reduce the impurity content. When operating the centrifuge, pay attention to monitoring the operating status of the equipment, and promptly detect and deal with abnormal conditions. In summary, the main causes of disc centrifuge scaling include crude oil quality, water quality problems, and improper operation and maintenance. By improving crude oil quality, improving water quality, optimizing operation and maintenance, and taking other measures, the disc centrifuge scaling problem can be effectively solved, ensuring stable operation of the equipment and improving product quality.