Study On Flow Characteristics Of High-temperature Oil Residue

Shortening the coking cycle can improve productivity and increase economic benefits. In the delayed coking unit, shortening the coking cycle was quickly applied and advanced. The new foreign technology will make use of steam driving to decoking at high temperature. The technology does not require steam purge, cold coke, drainage, hydraulic decoking process, and greatly reduce the coke cycle. It is necessary to explore the critical becoming the solid factors and the flow characteristics of the High-temperature oil residue to achieve custody transfer for High-temperature oil residue. Through the research reactor type into coke experiment device and performance of experimental device calibration, shows that the device can explore flow characteristics of High-temperature oil residue. Gas, liquid yield the sum is the evaluation indexes of the average reaction depth. We inspected the flow characteristics at different reaction depth and drive, under the condition of experimental pipeline.Results show that when the reaction depth is less than 63.01%, the extrusion coke quantity decrease gradually with the increasing reaction depth. The extrusion coke quantity is more than the residue coke quantity. The extrusion coke C/H increases gradually, a maximum of 18.11. Volatilize decreases gradually. The residue coke C/H also increases gradually, maximum 20.93 nearing the industrial device of 20 to 25 coking C/H index. When the reaction depth is near 65%, although the kettle coke C/H is already up to 25 ~ 27, the form of extrusion coke is asphalt shape oil coke or soft coke. The C/H and volatile analysis results indicate that the extrusion coke reaction depth is low. And the extrusion coke quantity significantly reduces, most coke has residue in cauldron. We think High-temperature coke has no liquidity at this reaction depth.In addition, we analyzed the upper, middle and lower residue coke when the reaction depth is near 65%, It shows that the C/H of the top and middle residue coke differ not quite, and the same to the average reaction depth basically. The reaction depth of the lower coke is obviously lower than the average reaction depth by heating not fully, which shows the C/H obviously lower than the top and middle residue coke. Therefore, when the reaction depth is near 63.01%, the High-temperature residue oil is critical becoming solid condition, and the top and middle residue coke gradually lose liquidity.