There is a belief that contemporary fluidized bed scrubbers can take the place of venturi/packed scrubber systems as they effectively address fouling issues, enhance capacity, improve particulate removal, and enable better control of environmental conditions. Fluidized bed scrubber systems demonstrate efficient removal of PM10 and PM2.5 particulate resulting in high-efficiency gas absorption.

The operation principle of a bed scrubber involves gas containing particulate pollutants entering through the gas inlet and then moving upwards. “Scrubbing liquid is introduced through fully open non-clog pipe distributors onto the surface of the induced fluidizing grid”. A fluidized bed scrubber may include single or multiple grid stages depending on the number of transfer units to provide the required particulate removal efficiency.

The high-speed gas in the fluidized bed scrubber system travels in an angled upward direction and fluidizes the liquid across the expansive open area grid surface. Compared to traditional scrubbers, fluidized bed scrubber uses swirl inducing vanes to considerably increase mass transfer and particulate pollutant collection. Modern fluidized bed scrubber systems include beds of low-density spheres.

“Liquid is introduced by way of spray headers at the top of the unit and travels downward while the gas to be reacted travels upward, countercurrent to the liquid flow. Gas velocities and liquid flow rates are maintained so that the sphere bed fluidizes (elevates, agitates, rotates) in the gas stream. This fluidization permits high flow rates of gas and liquid through the vessel.”

These fluidized bed scrubbers can operate at gas velocities varying from 50o to 1300 FPM, with liquid flow rates up to 75 gpm/sq.ft. without flooding. They offer the following advantages:

• high soluble gas absorption because of exceptional transfer parameters of the fluidized bed scrubber systems;
• efficient collection of particulates such as dust,  tars, oils, and suspended particles without plugging or channeling;
• high level of gas and liquid throughputs;
• low-pressure drop operation of the bed scrubber;
• wide range of fluidized bed operations.

Fluidized bed scrubbers provide gaseous and particulate pollutant removal in the chemical, pharmaceutical, pulp & paper, semiconductor, fertilizer, minerals, petroleum, and food industries. The applications of bed scrubber systems include acid gas collection from thermal oxidizers, chlorine dioxide and sulfur dioxide removal in pulp and paper bleach industries, acid and alkali fume air treatment from pickling, galvanizing, cleaning lines including HCL regeneration plants in the metals industry,  and more.

If you would like to make your contribution to improving air quality in order to provide air pollution control, Redwood Technology offers a cutting-edge Multi-Vortex scrubber. Multi-Vortex wet air scrubber could apply water contaminated with dust, sand, and even small rocks to capture particulate matter, different types of dust and some gases from the air.  If you would like to buy Multi-Vortex wet air scrubber or have some questions, please contact us at info@optromix.com