【Q&A】June 2, 2017

1. Corrosive and toxic fluids should be routed in the tube side； 2. Fluids that tend to precipitate or form scale should be routed to the side that is easier to clean ； 3. High-temperature and high-pressure fluids should flow in the tube side ； 4. Fluids that need to be cooled generally flow through the shell side ； 5. Fluids with low flow rates and high viscosity should flow through the shell side ； 6. Saturated steam or boiling liquid should flow in the shell side.

Unclean and scale-prone fluids should be routed in the tube side, as cleaning inside the tubes is easier； ?(2) Corrosive fluids should be passed through the tube side, so as to prevent both the tube bundle and the shell from being corroded, and to facilitate cleaning and maintenance ； (3) Fluids with high pressure should flow in the tube side to prevent the shell from being under pressure simultaneously ； ?(4) Toxic fluids should be routed in the tube side to reduce the risk of leaks ； ?(5) The cooled fluid should flow through the shell side, which facilitates heat dissipation and enhances the cooling effect ； ?(6) Saturated steam should flow through the shell side, as this facilitates the removal of condensate and non-condensable gases, and the steam remains clean without being contaminated ； ?(7) Fluids with low flow rates or high viscosity are better suited for use in the shell side, as the baffle plates allow turbulence to be achieved at low Reynolds numbers (Re＞100); however, multiple tube passes can also be employed inside the tubes ； ?(8) If there is a large temperature difference between the two fluids, it is advisable to let the fluid with a higher α (heat transfer coefficient) flow in the shell side, thereby reducing the temperature difference between the tube wall and the shell wall.

In terms of heat transfer efficiency, the material to be heated or cooled should flow through the tube side. However, considering that the tube side is easier to clean, materials prone to scaling are generally chosen for the tube side

For the shell side, use non-scaling, clean materials

Generally, water, water vapor, or highly corrosive fluids； Toxic fluids ； Fluids that tend to form scale, as well as those used in high-pressure operations, flow through the tube side ； And the steam condensed at the top of the tower ； Hydrocarbon condensation and reboiling ； For fluids where key pressure drop control is required, those with high viscosity flow through the shell side. In addition to the conditions mentioned above, it is also necessary to take into account the heat transfer coefficient and the optimal utilization of the pressure drop. From the perspective of the pressure drop, it is more reasonable to use the shell side when the Reynolds number is low. In typical top coolers, most of the material flows through the shell side, while the cooling water flows through the tube side. In reboilers, the material flows through the tube side, and steam and condensate flow through the shell side. .

Unclean and scale-prone fluids should be routed in the tube side, as cleaning inside the tubes is easier； (2) Corrosive fluids should be passed through the tube side to prevent simultaneous corrosion of the tube bundle and the shell, as well as to facilitate cleaning and maintenance ； (3) Fluids with high pressure should flow in the tube side to prevent the shell from being under pressure simultaneously ； (4) Toxic fluids should be routed in the tube side to reduce the risk of leaks ； (5) The cooled fluid should flow through the shell side, which facilitates heat dissipation and enhances the cooling effect ； (6) Saturated steam should flow through the shell side, which facilitates the removal of condensate and non-condensable gases, and the steam remains clean without being contaminated ； (7) Fluids with low flow rates or high viscosity are suitable for use in the shell side, as the baffle plates enable turbulence to be achieved at low Reynolds numbers (Re＞100); however, multiple tube passes can also be employed inside the tubes ； (8) If there is a large temperature difference between the two fluids, it is advisable to let the fluid with a higher α (heat transfer coefficient) flow in the shell side, thereby reducing the temperature difference between the tube wall and the shell wall.

In terms of heat transfer efficiency, the material to be heated should be in the tube side. However, considering that the tube side is easier to clean than the shell side, materials prone to scaling are generally used on the tube side

In terms of heat transfer efficiency, the material to be heated or cooled should be placed in the tube side. However, considering that the tube side is easier to clean than the shell side, materials prone to scaling are generally chosen for the tube side.

　　Answer: The selection principle is as follows: in terms of heat transfer efficiency, the material to be heated or cooled should flow through the tube side. However, considering that the tube side is easier to clean than the shell side, materials prone to scaling are generally chosen for the tube side

In terms of heat transfer efficiency, the material to be heated should be in the tube side