Why is it important to reduce the sulfur content of needle coke, and how can it be controlled?

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Sulfur causes puffing of the calcined needle coke. Increasing the delayed coker recycle ratio by cutting the heavy coker gas oil end point will make more needle coke and reduce the sulfur content of it.

Other ways to improve needle coke quality include minimizing steam in the heater passes, reducing the gravitity of the recycle gas oil, and raising the coke drum pressure.

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