Abstract: Based on the three-link strategic method of energy integration and optimization, a domestic delayed coking unit is taken as research background. The influence of the three-link method on the capacity expansion and energy-use is discussed, thus the relative bottlenecks are found. Using simulation software the strategies for capacity enlargement and measures for debottlenecking energy-use are proposed. It is demonstrated that the capacity enlargement and energy integration can be achieved simultaneously through optimization of furnace, optimizing the operation of fractionator, flexible design of the heat exchange networks and proper adjusting the recycle ratio, etc. Finally, based on the original process flow and equipments, a 25% increase of processing capacity and a decrease in energy consumption are achieved, the economic benefit is significant.

Key words: delayed coking unit, capacity expansion, energy-use optimization, bottleneck analysis