Feed/effluent heat exchangers The Alfa Laval Packinox Feed/Effluent Heat Exchanger for hydrotreaters is a large heat transfer bundle inside a pressure vessel. All heat transfer takes place inside the bundle, which operates in true counter-current flow. Four bellows compensate for differential thermal expansion between the hot stainless steel bundle and the relatively cool low alloy pressure vessel. Top and bottom end manholes facilitate access for maintenance or repairs. Because the bundle has no gaskets to soften and leak, the exchanger can operate in temperatures as high as 550°C (1000°F). Maximum operating pressure is the same as for the pressure vessel. The low number of high-pressure flanges in hot hydrogen service such as gasoil hydrodesulfurization greatly reduces combustible vapor leaks and emissions of toxic hydrocarbons and H2S. Refiners see this as a major step forward in plant safety and environmental performance for new units and revamps alike. HDS flue gas emissions of SOX and NOX are also reduced because charge heater duty is lower – or even zero – with Alfa Laval Packinox technology. Motivated by cheaper, cleaner, safer operation than offered by other designs, refiners now more than ever find Alfa Laval Packinox heat exchangers an efficient way to optimize their hydrotreaters. Alfa Laval Packinox devotes considerable resources to research and development of heat exchangers for hydrotreaters in response to the continued interest the refining industry has shown since the first Alfa Laval Packinox Feed/Effluent Heat Exchanger was installed in a hydrotreating unit in 1993. Feed/effluent heat exchangers and stripper bottoms heat exchangers Alfa Laval Packinox for hydrotreating

In an project to bring the output of a refinery processing kerosene/diesel/LCO feed into line with ultra low sulfur diesel specifications of 5 ppm, a distillate HDS unit was upgraded with a Alfa Laval Packinox feed/effluent heat exchanger. The upgrade includes the following: • Single shell Alfa Laval Packinox heat exchanger with a design pressure of 80 bar • Partial liquid feed by-pass to maintain HHPS temperature • Small, variable duty at “make up” charge heater Alfa Laval Packinox heat exchanger New booster compressor make-up hydrogen Feed/effluent heat exchanger solution

Stripper bottoms heat exchangers The Alfa Laval Packinox Stripper Bottoms Heat Exchanger was developed to recover stripper bottoms heat into stripper feed or reactor feed. This heat exchanger is suited to medium operating temperatures and pressures. Considerable cost is saved by eliminating the pressure vessel in favor of a simple set of bolted tie rods which securely clamp and compress the allwelded plate bundle. Additional savings are achieved on bellows and mid-bundle water injection system, as the Alfa Laval Packinox Stripper Bottoms Heat Exchanger requires neither. Design information (from...

How to contact Alfa Laval Up-to-date Alfa Laval contact details for all countries are always available on our website at www.alfalaval.com PPI00209EN 0705 Alfa Laval reserves the right to change specifications without prior notification. Because Alfa Laval Packinox provides much lower approach temperatures, the combined effect of the Feed/Effluent Heat Exchanger and the Stripper Bottoms Heat Exchanger increased charge heater inlet temperature from 305°C to 350°C, thus lowering heater operating duty by about 80% (18 MW*) for annual savings of US$ 2.6 million. In addition, the Alfa Laval Packinox...