Abstract: The Fengcheng super heavy oil with high viscosity and density was processed by diluting and reducing viscosity in 1.5Mt/a delayed coking unit. At the same time, the decalcification industrial test for Fengcheng super heavy oil was conducted by using KR-1 decalcifying agent. The results showed that the viscosity of the heavy oil is reduced to 60.03mm2/s when adding 20% dilute oil, while the contents of water and salt are decreased significantly. The calcium content is reduced from 359μg/g in feed to about 125-275μg/g in product under the moderate decalcification conditions. The current of each stage of the 3 stage desalination device is 150~180, 140~180 and 160~210A, respectively, indicating a small overall fluctuation of current of the unit. The coke ash is below 1.2% with a minimum of 0.7% during the industrial test.

Key words: Fengcheng super heavy oil, decalcification, electric desalting, coke, ash