Is it okay to stop performing large-scale steam injection after performing small-scale steam injection in the coke tower?
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After performing minor steam injection in the coke tower, can we stop using major steam injection and switch to hot water circulation instead? Please share your valuable insights.
Sure, just cool the focal point directly. We have tried to cool the coke directly with cold water, but care must be taken in the operation regarding changes in the pressure in the coke cooling tower. Direct cold coking is harmful to the coke tower; it is recommended to use it as little as possible.
Cooling the coke with hot water is definitely faster than doing so with steam, resulting in greater drops in pressure and temperature within the coke tower, which affects its service life.
Direct water injection can easily lead to charring and collapse accidents; be careful to control the amount of water injected
A strong blast should be applied; otherwise, the volatile content of the coke may be high, affecting its quality
Without proper blowing, the product quality is affected, and charring is likely to occur, leading to cold cokes that are difficult to remove. It is also necessary to control the blowing time. Hehe, safe production comes first
Theoretically, it is possible, but the duration of the small blowing process needs to be increased. The hot water circulation must be adjusted based on the temperature of the coke tower walls, and care must be taken regarding the amount of hot water supplied; otherwise, accidents such as coke explosion and collapse are likely to occur. This method prolongs the cold coke period and shortens the service life of the tower; it is still better to follow the traditional practices of low steam injection and high steam injection, as well as low water supply and high water supply. These practices have been developed through years of experience and are now well-established.
I’m not sure what “hot water circulation” means. Some current systems use saturated water (from the deaerator) in place of high-pressure steam; when this saturated water enters the coke tower, it undergoes a phase change, which is more effective at cooling the coke, and the results are good. Saturated water (deoxygenated water) is cheaper than steam, and it also helps to save energy and reduce consumption.
A refinery in Shandong has now adopted hot water for coking, and the results are satisfactory; there is significant vaporization, which helps to save a lot of steam in terms of energy conservation and cost reduction. It is important to pay attention to the operation procedures
The purpose of blowing in steam is mainly to carry away residual oil and cold coke. Blowing only with low pressure results in a slow flow rate, which prevents complete removal of the residual oil; this leads to a large amount of oil in the cold coker water. Using saturated water-cooled coke is also an option, but care must be taken with the water supply volume, as this can easily lead to overpressure in the coke tower.
It’s completely possible, but it will result in too high volatile content in the coke, affecting its quality