What are light yield, liquid yield, and total yield?
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For the various units in oil refining, what are light yield, total yield, and liquid yield of a unit? Is there any relationship between them? Is this a means of evaluating the capabilities of a device? I’m troubling everyone
Light yield refers to the yield of light oil, liquid yield refers to the yield of liquid products, and total yield, as the name implies, is the overall yield of products. For catalytic units, light yield = gasoline yield + diesel yield ； Liquid yield = Light fraction yield + LPG yield ； Total recovery = Liquid recovery + Dry gas recovery rate
For coking units, light yield = gasoline yield + diesel yield； Liquid yield = light oil yield + liquefied gas yield + wax oil yield ； Total yield = liquid yield + dry gas yield + coke yield.
I’m sorry, may I ask where the catalyzed slurry is classified? Apart from the slurry and what you mentioned, are the rest coking yield and losses?
The oil slurry yield should be added to the liquid yield, while the coke yield should be added to the total yield. When referring to the overall yield of the product, it does not include the yield of dry gas and coke.
Our coking unit’s liquid output does not include liquefied gas; it consists of gasoline + diesel + wax oil, accounting for about 60% of the total.
Light distillate = gasoline + light diesel; Liquid distillate = gasoline + light diesel + liquid hydrocarbons; Total liquid yield = gasoline + light diesel + liquid hydrocarbons + sludge
The light oil yield is expressed as the ratio of the output of gasoline and diesel to the amount of purchased raw materials, and it indicates a company’s capacity to produce gasoline and diesel. During actual calculation and comparison, significant fluctuations can occur due to changes in the operation of a company’s facilities or imbalances in their equipment, which prevents an accurate reflection of the actual operating conditions of those facilities. If a large amount of crude oil is transferred to inventory, the output of products will decrease and the relevant indicators will fall ； When the amount of purchased raw materials is low, the indicator for consuming inventory actually increases.
The light yield in distillation refers to the yield of gas oil and diesel, while the total yield refers to the sum of the light yield and the wax oil yield.