Exhaust Gas Scrubbers

SKU: C-660Duration: 26 Minutes Certificate Included

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Course Details

Specs

Training Time: 26 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Many industrial processes like kilns, boilers, and incinerators discharge spent gases to the atmosphere. These gases are often treated to remove pollutants in order to meet environmental regulations. A wet scrubber is one method that can be used to clean a gas stream by bringing the gas into contact with a liquid. This module will discuss the major components as well as the purpose and operation of an exhaust gas scrubber.

At the end of this module, you will be able to:

  • Describe the purpose and operation of an exhaust gas scrubber
  • Describe the advantages and disadvantages of wet scrubber systems
  • Describe the different types of wet scrubbers
  • Identify and describe the major components of a scrubber and related scrubber-equipment
  • Describe operating challenges and common problems for scrubbers
  • Identify key safety considerations when working with a scrubber

The following key questions are answered in this module:

What is the purpose of a gas wet scrubber?
Wet scrubbers are used to remove both particulate and gaseous pollutants from industrial waste gas streams.

What are the two crucial physical processes which occur is every wet scrubber?
Regardless the specific design, incoming gas must be, 1) put into intimate contact with scrubbing liquid and then, 2) the gas must be separated from the liquid before it is discharged.

What are four different design variants of wet scrubbers?
The main types of wet scrubbers include, venturi-based, spray chamber, tray tower, and packed bed scrubbers.

What is a quench chamber?
A quench chamber is pretreament applied to a hot exhaust gas stream wherein a spray of water is applied to cool the gas, prior to its entering a scrubber.

What is the last treatment that is applied to a gas before it leaves a scrubber?
Gas leaving a scrubber usually flows through a liquid entrainment separator, or demister, in order to remove entrained scrubbing liquor.

Below is a transcript of the video sample provided for this module:

A packed bed scrubber also called packed tower scrubber is designed to remove both particulate matter, as well as gaseous pollutants. The contaminated gas stream is fed into the tower. Inside the tower is a bed of special packing material. Nozzles spray scrubbing liquid on top of the packing material, and the liquid works its down the tower. As the gas passes up through the packing material, the particulate and gas molecules come in contact with the film of scrubbing liquid on the packing. The contaminated liquid drains down through the packing material past a packing support and out through the bottom of the tower. The gas stream flows out through the top of the packing material, past the nozzles and through a mist eliminator before exiting the tower.

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