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Home / News / Paint Processing Spray Tower Scrubber

Paint Processing Spray Tower Scrubber

Paint processing is a technological process entailing the coating of wares with various enamels and polishes, which include in their ingredients highly flammable solvents. Drying painted constructions is also included in this process.

The solvent vapors used in the painting production site have a density that exceeds the air density by between 2 and 5 times. The lower limits of the explosion hazard of the vapor of the solvents used exceed the permissible concentrations by hundreds of times.

Effective ventilation and cleaning of the air help control the volume of colorant vapors in accordance with sanitary norms and prevent their concentrations from being exceeded, since most of the vapors are extremely poisonous.

Equipment Request

A client contacted Torch-Air who has an automatic zinc sheet coating line.
The coating zone is about 10000 ft².

On the production floor inside the facility various substances ripped in a large concentration, but mostly solvents, Ethanol (ethyl alcohol), 1-Methylpropoxyethanol, Ethane-1.2-diol, 2-Etoxyethanol, Xylol, and others. The performance of the fan at this painting site is about 30000 cfm.
Production of the scrubber for the painting site
Production of the scrubber for the painting site

Torch-Air's Proposal

We proposed to our client a low-speed spray tower scrubber with a high air and gas mixture water solvent irrigation density of up to 30000 cfm in the air, according to the fan's performance. Since the line speed of gases in low-speed scrubbers is 200-1500 ft/m, we installed a droplet collector for reducing droplet wear on such a filter.

We also installed strong atomization fan nozzles operating under a pressure of 43-87 psi. They create drops of the required size.

We decided on the spray tower scrubber for the painting site, because the scrubber:
  • Effectively creates a mass exchange between the liquid phase and the air phase.
  • Effectively handles cleaning the air of various organic bonds.
  • Contact between gases and liquid drops being cleaned inside the scrubber productively cleans the air both of dust and of impurity gases, such as smoke and sprays. Cleans up to 99.9% of contaminations.
  • The gas cleaning process creates practically no waste.
  • The scrubber can operate under a temperature of up to 700 ˚C.
  • There is practically no water entrainment.
  • The required cleaning level can be regulated.
  • No sticking or crowding of the scrubber space guaranteed.
Production of the scrubber for the painting site
Production of the scrubber for the painting site

The Principle of Operation of this Wet Scrubber

Spray tower scrubbers let gas and dust flows through a screen of sprayed liquid. This liquid is sprayed out of nozzles at the top of the scrubber. Meanwhile, the dust particles and other admixtures are captured by drops of the scrubbing liquid and settle on the scrubber. The cleaned air exits the machine back into the facility.

Water circulates in the scrubber. An SAS is added to the water: cations.

Coagulant: iron sulfate or iron chloride (III) and aluminum oxychloride (OXA) in the form of 30% solutions.

Starting reagent expenditure for formation of the filtration layer: 220-1100 lbs.

Then, according to the measurement data: up to 150 lbs/hour. Additional equipment will be required to clean the water with a performance of 30 - 90 cfm.

The hollow scrubber successfully handled the objectives it's faced with at this painting site. It reduced the concentration of admixtures down to the level permissible according to sanitary norm values and has rendered the work area safe.
Publication date: Dec 06, 2019
Operating in USA, Canada, and Mexico
Black torch