Oil Refinery Delayed Coker Unit Wet Gas Compressor Experience

We at knpc , kuwait operate a coker Unit in good operation since 1987. The Wet gas Compressor in this Unit is always operating with Seal Oil & Lube oil Contaminated with Coke Fines & residual Gases. Do other Coker Wet gas Compressors hv similar issues. Our hs the oil seal rings Seal Oil system. We do change them once in 2 years. But oil is always with coke fines & it greatly affects the Drive Steam Turbine Control System. Kindly Share your experience.. Laks Kuwait National Petroleum Company, kuwait