Waste heat recovery, reboilers

Various glycol regeneration methods were considered, such as direct-fired glycol reboilers, o direct-fired indirect hot oil system, electricol heating ond waste heat recovery. A direct-fired in-direct hot oil system was finally selectd because it provided a safe, well proven regeneration system which could be accommodated within the platform space limitations. 

Selection of a stabilizer heat source depends on the heating medium and column operating pressure. The source of reboiler heat should be considered when a crude stabilizer is being evaluated. If turbine generators or compressors are installed nearby, then waste heat recovery should be considered. In addition, or alternately, fired heaters should be investigated. These factors must be considered when designing a crude stabilization system. 

One process modification is shown in Figure 8. In this modification, a heat recovery system uses the heat of the recovery column bottoms in the main column reboiler and in a bottoms preheater. If additional heat is needed in the main column reboiler, auxiliary heating is provided as shown by the (dotted) steam coil in Figure 8. However, a waste heat boiler is sometimes needed (shown dotted) to remove the excess heat in the recovery column bottoms. 

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