WATPACK® Packed Bed Scrubber
High-efficiency and small-footprint ammonia or sulfur dioxide removal from flue gas
High-efficiency ammonia and sulfur dioxide removal from flue gases
Our WATPACK® packed bed scrubber is a small footprint and high-efficiency packed bed, wet scrubber for the removal of acids, soluble gases, chemicals and fumes.
Acid or alkaline gases can be absorbed by our vertical counter flow WATPACK® packed scrubber using the corresponding reagent.
In both cases, the vertical assembly is a counter-flow design with contaminated gas flowing upwards and recirculating liquid spraying downward into the packing media, chosen for its efficiency and characterized by an important liquid/gas transfer area. Multiple absorption stages can be integrated for optimal removal efficiency.
Every absorption stage of WATPACK® will have a more concentrated recirculated solution compared to the next stage as to achieve the final expected concentration of pollutant in the exhaust gas flow.
The use of wetted media increases the liquid-gas contact and improves component mass transfer. Gaseous contaminants are absorbed by the liquid due to solubility levels or by chemical reaction.
Our WATPACK® range is particulary adapted for
- Desulphurization of flue gas: WATSOx®
- Ammonia removal from flue gas: WATMONIA®
The equipment for both treatments is identical, the injected soluble reagent however, is adapted for the abatement of the specific chemicals in the gas flow.
WATSOx®: removal of sulfur dioxide from flue gases
The WATSOx® unit is specifically designed for SO2 removal in flue gas. Like all scrubber columns, the WATSOx® unit is equipped with reagent sprayers and absorption packing. Air can be injected directly into the bottom of the re-circulation tank as to oxidize sulfites into sulfates.
Reagent sprayers
- The sulfur dioxide will be absorbed with several options for the reagent such as hydrogen peroxide, H2O2 (caustic soda), or NaOH.
- The main advantage for the treatment solution using hydrogen peroxide is the production of diluted sulfuric acid as bleed, and so resulting into a zero-emission treatment unit.
Zero-waste solution
The WATSOx® packed bed scrubber is a smart solution for a particular application and regenerative flue gas desulfurization using hydrogen peroxide (H2O2) with sulfuric acid (H2SO4) production
The absorption of SO2 using hydrogen peroxide is a simple method to remove SO2 from effluent gases. The reaction between SO2 and hydrogen peroxide (H2O2) can be simplified as follows:
SO2 + H2O2 -> H2SO4
The main advantage of this scrubber system is avoiding liquid waste because the H2SO4 produced in the scrubber system can be reused in the production process resulting into a zero-waste treatment unit.
WATMONIA®: Ammonia removal from fertilizer plant exhausts
Our WATMONIA® scrubber is designed for the ammonia removal in fertilizer plant exhausts.
To limit construction footprint, the WATMONIA® scrubber can be integrated with the WATTRAY® tray scrubber into a single staged combination for urea dust and ammonia abatement.
Depending on the ammonium concentration, several absorption stages will be configured into the WATMONIA® scrubber.
With each absorption stage of packing medium, the concentrated Ammonium Sulphate recirculated solution will be less concentrated
compared to the next stage until the final allowed concentration of
pollutant in the exhaust gas flow is achieved.
The first absorption stage will absorb up to 90% of the NH3,
in order to form a bleed at 40% wt of Ammonium Sulphate. To reduce to
the formation of acidic ammonium sulphate aerosols before the exhaust of
the scrubber, up to 90% of the NH3 will be treated in the first absorption stage.
A second or third absorption polishing stage, will remove the remaining ammonia creating a zero-ammonia emission system.
Advantages of the WATSOx® and WATMONIA® packed bed scrubbers
The WATSOx® and WATMONIA® packed bed scrubbers are both high-efficiency and small footprint solution offering several advantages
- High pollutant mass transfer
- Low pressure drop
- High range-ability
- Possible use of a variety of reagents (NaOH, H2O2…)
- Reduction or absence of bleed depending on the reagent used in the system
- Low maintenance
Contact us for removing sulphur-dioxyde and ammonia from flue gas
