Vent gas scrubber

Vent gas scrubber

Portable wet scrubber

  • Drizgas Tech has designed and developed a portable wet scrubber for handling low volume of acid/alkali fumes.
  • We are one of leading manufacturer of portable wet scrubber in India. We provide highly efficient, top-quality Scrubber systembuilt around your precise requirements. 
  • Can be used at indoor without any ducting

Working principle

  • The dirty gas stream is drawn into the portable wet scrubber and is forced down through an inner packed bed column.
  • Packed-bed scrubbers consist of a chamber containing layers of variously shaped packing material, such as Pall rings, Raschig rings or Berl saddles that provide a large surface area for liquid-gas contact.
  • The packing is held in place by wire mesh retainers and supported by a plate near the bottom of the scrubber. Scrubbing liquid is evenly introduced above the packing and flows down through the bed.
  • The liquid coats the packing and establishes a thin film. The pollutant to be absorbed must be soluble in the fluid. In vertical packed bed scrubber, the gas stream flows up the chamber (countercurrent to the liquid).
  • The moist clean gas stream is drawn up through the unit by an internally fitted blower, passes through a stainless steel mist eliminator, where the moisture is removed from the clean air and is discharged from the scrubber.
  • The byproduct which have settled to the bottom of the water reservoir are removed through a drain valve.

 

Features

  • Can handle air flow rate up to 300 CFM
  • Removal method is Absorption / Chemisorption
  • Material of Construction: PP, FRP, PP+FRP, MS+FRP, SS 304, SS 316
  • High efficiency Tellerette®Tower Packing removes soluble/reactive gases, solid particulate and liquid droplets down to 7 microns
  • Lower shell serves as integral sump for recycle of liquid
  • Spray nozzles accessible from top of unit
  • Entrainment separators prevent liquid carryover
  • Special multi-bed packing designs accommodate different scrubbing solutions for removal of multiple contaminants
  • Efficiency up to 99 %

Additional accessories

  • Continuous pH monitoring system for scrubbing liquid
  • Dosing system for adjusting pH
  • PLC operated control panel
  • SCADA system

Effectiveness of scrubbing solution

  • The effectiveness of the scrubbing solution in removal of harmful gases depends on the concentration of the scrubbing chemical, continuously depleted in the process. Scrubbing chemical concentration must be maintained to ensure effectiveness of the scrubber.
  • Control of the scrubbing solution strength can be achieved by either of the following methods:
  • Continuous Scrubbing:Continuous replenishment and blow down. Scrubber solution composition at any time will depend upon how it is being controlled, the scrubbing chemical, and gases being scrubbed.
  • Batch Scrubbing: Starts with an initially high concentration of scrubbing chemical that is allowed to reach near depletion, followed by blow down and replenishment by fresh, full strength scrubber solution.
  • The choice whether to control scrubber solution strength with pH or conductivity will depend on the scrubbing solution composition and how it changes during the scrubber operation. While each application should be reviewed separately, the applications best suited for pH and conductivity are as follows:

pH Control

  • pH control is often the choice for scrubbers using continuous blowdown and replenishment. Acidic gas scrubbing, such as hydrochloric acid (HCl), is controlled by maintaining an excess concentration of a basic scrubbing chemical, such as caustic (NaOH) or lime (Ca(OH)2). pH is specific to hydrogen ion (H+) concentration, which is related to the concentration of the basic scrubbing chemical. This specificity allows pH to be used to control scrubbing with minimal effects from scrubber by-products (unlike conductivity, which is nonspecific and will be influenced by by-products). 
  • If the scrubber uses strong caustic (10-15% NaOH), pH control is not recommended because the exposure of the pH glass to high concentration of caustic will attack the pH glass, thus destroying the electrode.

Applications

  • Sulfur dioxide (SO2) scrubbing
  • Hydrogen Sulphide (H2S) Scrubbing
  • Hydrochloric acid vapor (HCI) scrubbing
  • Chlorine (Cl2) gas scrubbing
  • Nitric Acid (HNO3) Fume scrubbing
  • Ammonia (NH3) scrubbing
  • Solvent vapor scrubbing
  • Methanol (CH3OH) vapour scrubbing
  • Ethylene oxide scrubbing
  • NOx Scrubbing system
  • Boiler Exhaust flue gas scrubbing

Frequently Asked Questions

A Vent Gas Scrubber is a system designed to remove harmful gases, particulates, and pollutants from industrial exhaust streams using a combination of wet scrubbing and chemical absorption techniques.

The scrubber is effective in removing pollutants like sulfur dioxide (SO2), hydrogen sulfide (H2S), ammonia (NH3), chlorine (Cl2), and other hazardous gases and vapors.

The scrubber is constructed using materials like PP, FRP, SS 304, and SS 316, ensuring durability and compatibility with a wide range of chemicals.

The scrubber achieves up to 99% efficiency in removing pollutants, ensuring compliance with stringent environmental regulations.

Yes, the system can be fully customized, including features like pH monitoring, dosing systems, and SCADA integration, based on the application's requirements.

Vent Gas Scrubbers are widely used in industries such as chemical plants, petrochemical facilities, food processing, pharmaceuticals, and boiler exhaust systems.

 

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