Some fluids are temperature sensitive such as those subject to polymerization by contact with high temperature heat transfer tube walls.
2.
Ash coolers are prone to foul the bed while the heat transfer tubes in fluidized bed are prone to erosion can be removed by the use of some fluidizing air.
3.
Aluminum pipe or tubing may be utilized where iron is incompatible with the service fluid or where weight is a concern; aluminum is also used for heat transfer tubing such as in refrigerant systems.
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