Wet air scrubbers have numerous applications in industrial processes to take away dangerous and polluting gas emissions. These gases are caused by combustion in utility and industrial process plants. The process of air treatment by wet scrubbers demonstrates high efficiency in the removal of by-products and waste gases such as hydrochloric acid (HCl), hydrogen sulfide (H2S), chlorine (Cl2), and sulfur dioxide (SO2).

The operating principle of wet air scrubbers is based on “spraying the incoming gas stream with a scrubbing solution containing a neutralizing chemical, which destroys the harmful gas.” The efficiency of the scrubbing solution is dependent on the concentration of chemicals that are used throughout the air treatment process. Therefore, maintaining chemical concentration in scrubbers is necessary to provide effectiveness.

Monitoring the strength of the scrubbing solution can be ensured by using either of the following methods:

1. Continuous wet air scrubbing encompasses ongoing replenishment and blowdown, during which the management of the scrubber solution, scrubbing chemicals, and gases affects the composition.
   
2. Batch wet scrubbing is based on “an initially high concentration of scrubbing chemical that is enabled to achieve near depletion, followed by blowdown and replenishment by fresh, full-strength wet air scrubber solution”.

Additionally, it is crucial to closely consider the decision of whether to track wet scrubber solution strength using pH or conductivity, as this depends on the solution composition and how it changes during the operation of the wet air scrubber. Modern scrubber systems use special sensors for pH monitoring.

For instance, pH sensors in wet scrubbers are installed at a high flow area (in-line > 3 ft/sec velocity is suggested), while conductivity sensors are applied for scrubber system control because they offer such benefits as high resistance to fouling and need for minimal maintenance, unlike conventional contacting sensors. Moreover, such sensors for air treatment devices provide the high conductance of many of these scrubbing solutions and by-products.

It is required to collect the full information about the wet air scrubber application before choosing sensors:

• Gas or gases being scrubbed (chemical name and formula);
• Scrubbing chemical and desired concentration range;
• Scrubbing method employed;
• Maintaining scrubbing chemical concentration by continuous blowdown and replenishment (continuous wet air scrubbing);
• Enabling scrubbing chemicals to deplete down to a certain concentration range (batch wet scrubbing).

If you are looking for the best air treatment device to improve air quality, Redwood Technology offers a cutting-edge type of wet scrubber – a Multi-Vortex wet air scrubber.

Redwood technology is a fast-growing vendor of wet air scrubbers. The multi-vortex scrubber can remove gas emissions, dust, vapors, and other pollutants from a gas stream. It is an innovative technology created to save water that makes it more cost-efficient and differs from other types of scrubbers.  If you have any questions or would like to purchase a multi-vortex wet air scrubber, please contact us at info@rdwd.tech