Selection of the steam inlet pipe location in the desorption tower
Thread Content
The original steam inlet pipe of the desorption tower enters from within the liquid at the bottom; if it is changed to enter above the liquid surface so as to directly strip the descending liquid, what changes will occur? Please share your opinions.
Moving it above the liquid surface allows the steam to come into direct contact with the descending liquid; this change enhances the gas-liquid contact and improves the mass transfer efficiency. The steam does not need to first penetrate through the bottom layer of the liquid, which reduces the resistance of the steam in the liquid as well as energy losses, thereby helping to improve the desorption effect. At the same time, this setting may reduce the residence time of vapor bubbles in the liquid, thereby lowering the pressure drop in the system. However, such changes may pose difficulties in operational control, such as the need for precise control over steam flow and liquid level to prevent liquid splashing or direct release of steam. .
Raising the steam inlet position should reduce steam consumption, but the distribution of the rising steam deteriorates.
Indeed, raising the steam inlet position can reduce the residence time and dissipation of steam in the liquid, thereby saving steam consumption. However, this arrangement may affect the uniform distribution of steam throughout the desorption tower. Since the steam enters from above, it may result in less steam reaching the liquid at the lower level, thereby affecting the mass transfer efficiency in that area. This may require optimization by adjusting the structure inside the tower or adding steam distribution devices to ensure that the steam is distributed more evenly within the tower. .