Q & A > Question Details
What is the importance of minimum CCR and ashpalatens in Coker feed. Do we really need to maintain certain minimum limits for these feed properties?
28/09/2016 A: Keng Chung, Well Resources Inc., kengchung@hotmail.com
If the coker is used to reject "nasty" of highly contaminated feed, then it doesn't really matter. You will then use CCR-barrel to estimate the coke yield. However, if it is for producing high quality coke products, then the minimum CCR and asphaltenes contents can be important feed properties.
28/09/2016 A: Eric Vetters, ProCorr Consulting Services, ewvetters@yahoo.com
If your coke yield is significantly less than design, that means that your hydrocarbon product yield will be much higher than design. As the hydrocarbon yield increases the vapor velocity in the drums will increase. if it gets too high you can start to entrain coke/tar into the vapor leaving the drum and you can foul the fractionator, so that is one possible risk of running a low CCR feed. I don't know if the risk of blow outs or other operational problems is a concern or not.
27/09/2016 A: Sridhar Balakrishnan, Bharat Oman Refineries Limited , laksrid@yahoo.com
These two parameters carbon residue and asphaltenes content in Coker feed are vital factors for deciding the coke yield in the process .Coke yield is calculated by multiplying the carbon residue content of short residue into one point six . Also quantity of asphaltenes present also can decide the type of coke formation . Carbon residue of coker feed will be maintained around twenty to twenty five percent, asphaltenes content will be maintained around nine to eleven percent. Different refiners have different specifications , based on crude oil type and coke yield pattern.