Scrubbers

Scrubbers are an efficient type of air pollution control equipment used to remove particulate matter, fume and gases (especially acid gases) from industrial processes. Scrubbing can be done either by wet or dry mechanism which then categorise the equipments into dry and wet scrubbers. Wet scrubbers are pollution control equipment that use water or other liquid solutions to scrub particulate matter and harmful gases from the gas stream. However, the dry scrubbers are that in which a dry reagent or slurry is injected into the dirty exhaust stream of gases to neutralise or eliminate gaseous components.

ScrubbersWet scrubbers eliminate particulate matter from exhaust gas streams by capturing the particles in fine liquid mist droplets or in layers of scrubbing liquid and then separating the liquid droplets from the gas stream.

There are various process variables which affect the performance of particle removal or performance of the scrubber, being, particle size distribution, size of liquid mist droplets, and the relative velocity of the particles and the 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 acts 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
  • Higher resistance production by creation of suitable pressure drop
  • Selection of suitable scrubbing liquid for gaseous pollutants
  • Higher 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

  • Ventriscrub
  • Centiscrub
  • Multiscrub C
  • Multiscrub H
  • Dynascrubb
Dyna 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
  • Furnaces
  • Autoclaves
  • Gas absorption
  • Building product mfg
  • Incinators
  • Blow tanks
  • Kilns
  • Boilers
  • Lime hydrators/slakers
  • Conveyors and transfer points
  • Odor Control/removal
  • Cupolas
  • Crushers and screens
  • Palletizing dissolving tank
  • Vents rendering
  • Dryers
  • Sand systems/strong>
  • Fumes/VOC smelters
Operation

High Energy Scrubbers

Ventury scrubbers are widely used type of scrubbers in the industry for various applications. Ventury scrubber sections always have uniform wet surfaces which avoids and eliminates wet and dry line build-up problems. Ventury scrubber has the following main components:

  • Ventury
  • Throat
  • Flooded elbow
  • Separator
  • Mist eliminator

Throat can have different designed constructions like fixed, butterfly type or double flap type. Heavy dust laden gases are passed through the ventury unit in vertical direction. At the ventury section, scrubbing liquid is injected through tangential pipes and spray headers. This ensures complete coverage on ventury 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 than taken into cyclonic separator through 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

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.

Features:

  • Non-moving parts
  • Self-cleaning and self-draining design
  • Non-clogging type

Industries

Cement
Agro - chemicals
Chemicals
Minerals
Paints
Pharma - ceutical
Steel
Food

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