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Packed Cooling Tower
A packed tower is a widely used high-efficiency gas-liquid mass transfer equipment with the characteristics of low pressure-drop, low energy consumption and high efficiency.
It is widely used in chemical separation processes such as distillation, gas absorption and cooling. It’s usually used for the treatment of clean and particle-free gas.
The liquid enters from the upper part of the tower, is evenly distributed on the packing through the liquid distributor, and then flows downward along the surface of the packings to transfer heat and mass with the ascending gas.
The gas enters from the lower part of the tower, passes through the gas distribution device, and evenly passes through the packing layer upward, and contacts the spray liquid on the surface of the packing.
The packed tower is a continuous contact gas-liquid mass transfer equipment. Usually, the gas phase is a continuous phase, and the liquid phase is a dispersed phase. The composition of the gas phase and the liquid phase changes continuously along the height of the packing layer until the ideal gas phase composition is obtained at the top of the packing layer.
Basic structure diagram:
The packing tower is divided into four sections from bottom to top: the tower bottom section, the gas inlet section, the mass transfer section, and the mist removal section at the tower top.
The section between the tower bottom and the mass transfer packing layer constitutes the gas inlet section.
The structural design of the gas inlet section aims to ensure uniform distribution of the treated gas while minimizing gas pressure drop.
The mass transfer section is the most critical part of a packed tower.
All structural internals within the mass transfer section must not only meet strength requirements but also ensure uniform distribution and flow of gas and liquid.
The largest possible free flow area must be maintained while also meeting the requirements for installation, removal, and maintenance of the tower structure and packing.
The packing mass transfer section constitutes the top portion of the tower, primarily serving to remove mist droplets.
Demisters are available in various types and materials.