Wet Scrubber Manufacturer
With over 190+ installations Rieco scrubbers have served the particulate matter removal needs of various Flue-gas desulphurization (FGD), Gas Cleaning Plant, Fume treatment, and Gas treatment applications.
What are scrubbers?
Scrubbers are high efficiency air pollution control equipments used to remove particulate matter, fumes and gases (especially acid gases) from industrial processes. The process takes place by ‘scrubbing’ the pollutants by contacting them with a scrubbing media (either wet or dry) thus resulting in a residual exhaust of negligible particulate size. We thus categorise them into dry and wet scrubber systems.
Wet Scrubbers: A Wet Scrubber System uses either water or other liquid solutions to scrub particulate matter and harmful gases from the gas stream. A Wet scrubber captures the particles in fine liquid mist droplets or in layers of scrubbing liquid and then separates the liquid droplets from the gas stream.
Dry Scrubbers: Dry Scrubbers use a dry reagent or slurry which is injected into the dirty exhaust stream of gases to neutralise or eliminate gaseous components.
Selecting the right solution:
Various process variables affect the performance of scrubber systems and particle removal namely, particle size distribution, size of liquid mist droplets, and the relative velocity between the particles and liquid mist droplets. The most important parameter is the particle size of the inlet dust content. The larger particles are easier to collect as compared to the finer ones. The key factor for effective particle removal in a wet scrubber is to create a mist of tiny liquid droplets which act as collection surfaces. Higher scrubbing efficiency for finer particles can be expected when scrubbing liquid is with the finer mist droplets and more densely available.
Efficiency of scrubber depends upon the following major parameters:
- Formation of mist of tiny droplets
- Resistance produced due to pressure drop creation
- Selection of suitable scrubbing liquid for gaseous pollutants
- Relative velocities between dust particles & liquid droplets
- Uniform mixing between gas molecules and liquid phase
- Treatment and reaction time between liquid droplets and gas molecule
- Selection of appropriate liquid to gas ratio
Types of scrubbers
- Venturi Scrubber
- Centrifugal Scrubber
- Multi-Venturi Scrubber
- Dynamic/ Wet Fan Scrubber
- Packed Bed Scrubber
- High dust collection efficiency
- Simple and trouble-free design
- Control of Ambient air quality as per standards – Fugitive emissions at the stack outlet – Work zone emissions – Gaseous emissions
- Product Collection Systems – Part of production process – Recovery of valuable product
- Acid Mist
- Gas absorption
- Building product mfg
- Blow tanks
- Lime hydrators/slakers
- Conveyors and transfer points
- Odor Control/removal
- Crushers and screens
- Palletizing dissolving tank
- Vents rendering
- Sand systems/strong>
- Fumes/VOC smelters
High Energy Scrubbers (Venturi Scrubbers)
Venturi scrubbers are widely used type of scrubbers in the industry for various applications. A Venturi wet scrubber system section always has uniform wet surfaces which avoids and eliminates wet and dry line build-up problems. Venturi scrubber has the following main components:
- Flooded elbow
- Mist eliminator
Throat can have different designed constructions like fixed, butterfly type or double flap type. Heavy dust laden gases are passed through the venturi unit in vertical direction. At the venturi section, scrubbing liquid is injected through tangential pipes and spray headers. This ensures complete coverage on venturi and throat area. The throat is operated in a manner to obtain the suitable pressure drop for getting the maximum collection efficiency. The scrubbed gases are then drawn into a cyclonic separator through a 90-degree flooded elbow. At the cyclonic separator gases and liquid droplets separation occurs. The slurry is discharged through the bottom cyclonic separator and cleaned, and scrubbed gases are vented out through mist eliminator by eliminating carry over liquid particles.
Low Energy Scrubbers (Centrifugal/Vane Scrubber)
Low energy scrubbers are used for removal of coarser particles which requires lower pressure drops. It achieves high collection efficiencies in the 5-10-micron range with low liquid rates. These scrubbers have tangential gas inlets which creates centrifugal action. It consists of multi-vane arrangement which creates the water curtain to separate out the dust particle from gas stream. There are no moving parts in this type of scrubbers.
- Non-moving parts
- Self-cleaning and self-draining design
- Non-clogging type