Scrubbers are gas/liquid/solid contactors that proportion large interfacial surface areas and a high degree of turbulence between the corresponding phases, allowing for an efficient removal of particulates from gas streams, noxious substances absorption and gas cooling.
GEA is the inventor of global standard solutions like the “Bischoff–scrubber” for blast furnaces or the “Wiegand-scrubber” for small to midsize industrial exhaust streams.
GEA offers tailor-made solutions – from laboratory to full process scale, from thermoplastic or fiber reinforced plastic (FRP) materials to high-alloy stainless steels – in order to provide, both technically and economically, optimal solutions for our customers. GEA offers clean air solutions while keeping the CAPEX/OPEX low.
Wet scrubbing units use a liquid scrubbing medium. Depending on the application, either water, hydrocarbons, diluted acids, caustic soda or other liquids.
The type of scrubber and the applied scrubbing medium depend on the process-specific requirements and on the emission´s limits that shall be complied with. The below table gives an overview of GEA´s scrubber portfolio, the typical cases on which scrubbers are used and their specific advantages:
|Process / Unit Operation||Technology||Typical Applications||Gas flow rate / Application size||Cooling Performance||Particle Separation Efficiency||Absorption Efficiency||Energy Demand|
|Gas cooling||Hot gas quench system||Flue Gas Treatment after Incineration||small to medium||+++||+||++||o|
|Quench Tower||Non Ferrous- / Chemical Industry||medium to large||+++||+||+||+|
|Particle Separation||Spray Tower||Lime Scrubber||medium to large||+||o||+||+|
|Jet Scrubber||Chemical Industry||small to medium||++||+||++||o|
|Venturi Scrubber||Chemical Industry||small to medium||+||++||+||+|
|Anular Gap Scrubber||Iron & Steel Industry||medium to large||+||+++||+++||+|
|Radial Flow Scrubber||Non Ferrous Industry||medium to large||+++||+++||++||+|
|Linear Flow Scrubber||Non Ferrous Industry||medium to large||+++||+++||++||++|
|Wet Electrostatic Precipitator||I&S/NF/Chemical Industry||medium to large||+||+++||+||+|
|Candle Filters||Chemical Industry||small to medium||o||+++||+||+|
|Gas Purification by absorption of gaseous components||Spray Tower||Iron & Steel-/ Non Ferrous- / Chemical Industry||medium to large||++||+||+++||+|
|Jet Scrubber||Chemical/Petrochemical and Pharma||small to medium||++||++||++||o|
|Annular Gap Scrubber||Iron & Steel Industry||medium to large||+||+++||+++||+|
Some of the most common applications for wet scrubbers are:
Flue gas cleaning
Flue gases from combustion, chemical production or recycling processes are treated in multi-stage gas cleaning processes. By using quenching and/or absorption and concentration stages, pollutants such as halogens and their hydrogenated derivatives, sulfur compounds, ammonia and many more can be removed from the gas and recycled into the production process.
Process gas cleaning
Not only flue gases but also process gases in chemical production processes can be treated to recycle solvents and reduce the need for solvent replenishment.
Gas Treatment Lines for various industries
GEA´s wet scrubber systems are widely applied in the industry, very often in the non-ferrous metallurgy, chemical, petrochemical and pharmaceutical industry, iron & steel production, cement and glass manufacturing.
Compact gas scrubbers
GEA-design compact gas scrubbers are made for the treatment of emissions in laboratories and pilot and production plants in the chemical and pharmaceutical industry. They are in use for cooling gases, condensing vapors, absorbing pollutants, separating dust and aerosols and conducting in-situ chemical reactions.
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