1 million tons of delayed coking cycle ratio
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The recycle ratio of my unit is around 0.4, with wax oil as the output. And I heard that the circulation ratio of a certain device is over 1. However, it does not produce paraffin oil; the diesel yield is 40%, and the coke yield is 23%. I would like to ask about the importance of the circulation ratio, what the future trends for it are, and why Thank you!
Those with a low circulation ratio should have good efficiency. The processing process with a high circulation ratio is short.
A smaller circulation ratio yields better results; your design should be such that it is not greater than 1.
Why does a lower circulation ratio yield better results? Could you explain in detail?
Could the expert explain it in detail?
The higher the circulation ratio, the greater the reprocessing of wax oil, and the higher the coke yield, which is not economically viable. Coke is too cheap.
The higher the circulation ratio, the greater the coking rate, which can even exceed 30%. With a coke price of 800 yuan per ton, the economic losses are substantial； The yield of the light cycle oil is 25% compared to that of paraffin oil, while the yield of coke is even less than 20%. This also depends on the properties of the raw materials being processed. By comparing the yields of coke, it’s clear which option offers greater economic benefits The impact of cyclic matching on the processing volume, as well as the level of energy consumption, must also be taken into account.
The lower the cycle ratio, the better; the future trend is definitely a cycle ratio of 0. A high cycle ratio means that wax oil acts as residue and is fed back into the coke oven for cracking, which results in low economic efficiency. The magnitude of the circulation ratio mainly depends on the properties of the raw materials and the control of the specifications for wax oil products.
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