Packed tower scrubbers differ from other wet scrubbers in the internal packing inside the scrubbing vessel. This packing provides a large wetted surface where the contaminated air flow comes into contact with the washing liquid of the equipment. Depending on the scrubbing liquid used and the gaseous pollutants involved, the liquid will absorb or react with the pollutants in the gas stream, effectively removing them from the air. Alkaline, acidic or oxidizing detergents are typically used in the recirculated wash liquor to achieve the desired outlet discharge.
For vertical countercurrent scrubber operation, the contaminated gas will flow up through the bed of the vessel, while the scrubbing liquid is gravitationally flushed down through the bed. At the top of the scrubber, a liquid distribution header evenly distributes the scrubbing solution so that the liquid is evenly distributed on top of the packing. The extended contact time between air and liquid enables the scrubber to absorb or react with contaminants as the air moves up through the packing. Before the scrubbed air leaves the container, it passes through a mesh or chevron mist eliminator to remove any entrained droplets, ensuring the highest quality outlet airflow.
The composition of a particular gas stream and desired removal efficiency will be used to determine the characteristics of the scrubber, including its bed depth, packing size, irrigation rate, and chemicals used.
Packed bed tower scrubbers are designed to remove gaseous or gaseous pollutants from gas streams. This process is accomplished by contacting the contaminated air stream with a scrubbing liquid that absorbs or chemically reacts with the contaminants. The clean air is then vented to the atmosphere, and the contaminated scrubbing fluid is either treated in an approved process or can be recovered in the original process and reused in other processes.
There are two types of Packed bed tower scrubbers:
Vertical Packed bed tower scrubbers
In a vertical counterflow design, the gas flows upwards and the scrubbing liquid flows downwards through the spray stack. Absorption of gas occurs in the bulk section of the scrubber, where scrubbing liquid is introduced into the liquid through a spray distribution system. High-efficiency mist eliminators remove entrained liquids. Clean gas is present at the top of the container.
Horizontal Crossflow Industrial Wet Scrubbers
In a horizontal design, the gas flows horizontally, while the scrubbing liquid flows downward through a liquid distribution system. The scrubber includes a random packing section in which gas absorption occurs. High-efficiency mist eliminators remove entrained liquids. The one-piece oil pan is located at the bottom of the packing section, eliminating the need for an external oil tank.
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