What is the main reason for heating the stripper slowly?
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Is it a damaged device or something else? I hope everyone can give some advice
In a stripping tower, the temperature difference between the top and bottom is generally small, which indicates that the boiling points of the components to be separated are not very different. If the temperature is increased too rapidly, it becomes difficult to establish equilibrium across the various trays, and mass transfer also becomes problematic, preventing the achievement of the separation goal.
If the temperature of the steam is increased too quickly, the steam will lift the material; as a result, the lower part of the material becomes cold while the upper part remains warm. The steam condenses entirely at the bottom and cannot pass through the tower, thus failing to achieve the purpose of mass and heat transfer
Rapid heating of the vapor can cause flooding in the tower, preventing proper distillation from taking place!
I’m not sure which type of stripping tower the original poster is referring to. If it’s a urea carbon dioxide stripping tower, the reason why the temperature cannot be increased too quickly is that, to prevent corrosion, a stainless steel lining is installed on the inner layer of the tower, with a carbon steel shell on the outside. These two materials are bonded together, but their coefficients of thermal expansion differ – stainless steel has a coefficient 1.5 times higher than that of carbon steel – which can cause the lining to deform when heated, leading to leaks and damage to the equipment. It poses a significant threat to safe production; therefore, attention should be paid to the rate of temperature increase when raising the temperature.
Prevent mist entrainment and even flooding.
This post was last edited by lxq700918 on 2009-9-1 19:54. In actual production, to protect equipment, it is necessary to raise the temperature of devices such as distillation towers slowly; the same applies to other chemical processing equipment. This is because heat transfer requires some time. If one part of the equipment heats up too quickly while other parts have not yet reached that temperature, the different expansions resulting from these temperature differences can easily cause damage to the equipment. This is especially true for equipment with inner and outer linings made of different materials; otherwise, the difference in expansion coefficients between the inner and outer linings can easily lead to damage to the equipment.