- Lower OPEX – The high heat recovery leads to substantial energy savings. Maintenance costs are also low thanks to minimal fouling.
- Lower CAPEX – A single Packinox can replace several large shell-and-tubes and makes it possible to operate processes with smaller furnaces and cooling
- Higher process yield thanks to a low pressure drop, optimal liquid/gas mixing, high operating flexibility and a fully customized design.
- Reliable, proven technology – More than 350 units in operation worldwide.
- Real-time monitoring and continuous optimization by Alfa Laval experts.
Packinox heat exchangers combine the high-pressure and high-temperature resistance of shell-and-tube heat exchangers with the outstanding heat transfer performance of plate heat exchangers. A single Packinox heat exchanger outperforms systems consisting of multiple large shell-and-tubes, both in terms of heat recovery and investment costs. Due to its many advantages, Packinox has become the industry standard combined feed/effluent heat exchanger in catalytic reformers and paraxylene plants. The potential OPEX reduction in these applications is significant, and choosing the right heat exchanger has a great impact on energy bills.
How it works
The recycle gas enters the heat exchanger at the bottom and passes the Spray Bars on its way into the plate pack. The liquid feed enters from the side and is sprayed into the gas by the Spray Bars. This ensures a perfect mix of liquid feed and recycle gas, which facilitates lifting and makes it possible to operate the unit on a high liquid-to-gas ratio for maximum yield.
The feed/gas mixture moves up through the plate pack while the reactor effluent travels in the opposite direction. The highly turbulent, counter-current flow ensures that most of the heat from the reactor effluent is recovered and heats the cold feed. The hot approach temperature can be as low as 25°C (45°F).
The outstanding heat recovery reduces the load on both the reactor heater and the cooling system compared to using other types of heat exchangers, thereby reducing both OPEX and CAPEX.