Composition of recycle oil helps determine coke yield

Knowing the composition of the recycle oil charged to the coker fractionator helps determine coke yield and thus coking economics.The composition of recycle oil is not easy to determine, however, because it does not exist separately from the coke-drum product.A method proposed by Zhejiang University, China, determines the composition and coke yield of recycle oil found in delayed coking. To accomplish this, the method estimates the subfraction content and cut fraction distribution of the coking feedstock. That is, it estimates the content of the heavier hydrocarbons that come off the bottom of the fractionator to be recycled to the furnace.To show the effect of throughput ratio (TPR) on c...

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