Gas Scrubbing

CDC tailor-manufactures gas scrubbing equipment and solutions on demand, delivering a holistic gas and dust scrubbing service for mining and industrial applications.

Gas scrubbing and gas scrubbers explained

Gas scrubbing – also called gas absorption – is a process that brings gas streams into contact with liquid and allows some of the gas components to pass through the liquid using a gas scrubber. The function of a gas scrubber – also referred to as a gas absorber – is to eliminate harmful particulates and liquid hydrocarbons from natural gas by neutralising them via absorption. This gas management process limits the negative impact gas emissions have on the environment and people in its surroundings. 

Scrubbing is used to manage dust as well as gases, and there are primarily two types of industrial scrubbers – wet scrubber systems and dry scrubber systems. Wet scrubbers are extremely effective when used as air pollution control devices that remove gas or dust particles from industrial exhaust streams and those emitted from mining activities.

Wet and dry scrubbing – the difference

Dry scrubbers extract and clear pollutants from industrial exhaust gases using sorbent, a dry reaction material like alkaline slurry, for example. They remove acid from gas as it transfers through the sorbent, maximising binding. They are also used in dust management and control applications.

Wet scrubbers, on the other hand, transfer contaminated gas via a liquid that removes pollutants. They are not only used for gas scrubbing purposes, but perform excellently as dust scrubbers, simplifying and enhancing dust suppression and control. Through their versatility, most wet scrubbers can eliminate up to 99% of airborne particulate.

Gas scrubber composition and advantages

A gas scrubber consists of three main components – an absorption section where the gas is exchanged, a demister and a pump-driven recirculation tank. Gas scrubbers that remove gas from working environments offer several benefits:

  • Collect dust & absorb gas in a single scrubber unit (dual functionality)
  • Reduces risks of flammable & explosive dust
  • Serves as refrigeration for warm gas flows
  • Neutralises corrosive dusts & gases
  • Consists of relatively elementary technology
  • Caters to a broad range of applications
  • Facilitates compact installations
  • Relatively easy to maintain

 
In most countries that have industries where employees are exposed to harmful gases, gas scrubbers are a legal requirement. When used optimally, a high removal efficiency of gas particles is achieved so only non-contaminated fumes reach the environment.

How the gas scrubbing process works

In basic wet scrubbers, solvent is encapsulated in a container and contaminated gas moved through it. The pollutants are absorbed by the solvent allowing only clean gas to exit the scrubbing system.

Although there are a variety of liquids used as solvents that facilitate absorption in gas scrubbing, water is, generally, most used to extract and discard inorganic pollutants.

CDC Gas Scrubbing Solutions

CDC is a manufacturer of dry and wet fan scrubbing systems, with each wet fan scrubber tailor designed and manufactured to customers’ precise specifications.

We use a range of design software to ensure process performance that exceeds client expectations. Some of the software used in developing advanced scrubbing solutions include Solid Edge, 3D and Inventor® CAD software for professional-grade mechanical design, and parametric feature and synchronous technology solid modelling software.

We also use Computational Fluid Dynamics (CFD) software to increase our ability to design products to our customers’ specific requirements, as well as vibration analysis and static & dynamic finite element software.

CDC Wet Scrubber for gas scrubbing

A high-efficiency, low-inertia axial fan driven by a custom-built water cooled electric motor. The CDC range is available in 5 variants to suit customer air volume, flow and power needs.

The system caters for air volumes to up to 25 m3/sec and air flow rates can be increased on fit-for-purpose wet scrubber designs. Its computer-designed impeller provides low inertia, low noise and high efficiency, while a multi-layer stainless steel screen provides high particle arrestance and low resistance.

For applications where space breadth is a constraint, two smaller single units are mounted either horizontally or vertically, resulting in a double-mounted unit providing the required gas scrubbing results.

Easy to install and maintain, the range offers the following additional benefits:

  • Compact & lightweight
  • Low power requirements & water consumption
  • High performance & efficiency
  • Fast change out of fan assembly

We tailor all our equipment to suit clients’ exact specifications.

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