The main fractionator heat integration with a gas plant can supply the incremental energy required to meet improved olefins requirements and improve the thermal efficiency of the unit. Understanding the fractionator energy recovery limitations, possible pumparound draw temperature options, and various temperature levels of the heat sinks is important when optimizing. On a "typical" 8000m3/day FCC main fractionator the recoverable energy from the overhead system is 11.2MMkal/hr. On older units this may be much higher, and including product recoverable heat losses this may be 50 per cent higher. The main fractionator LCO and gasoline product recoveries can be improved by the heat balance adjustments associated with optimization. The main fractionator vapor loadings are more than 20 per cent higher in the optimized design.
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