Welding exhaust gas treatment

Manufacturing industries such as shipbuilding, automobile manufacturing, household appliances, computer components… are increasingly growing throughout the country. What these industries have in common is that they all usewelding techniques in theproduction process. During the welding process, welding exhaust gases often arise such as ozone, nitrogen and CO, Argon, helium…

These gases are not only harmful to human health, welding fumes can lead to various environmental impacts. Therefore, welding exhaust gas treatment during the production process is always a problem for businesses today.

The optimal solution to thoroughly handle this situation that businesses prioritize is to install a welding exhaust gas treatment system.

What is welding fumes?

Welding exhaust gas is a complex mixture of metal oxides, silicates, fluoride and argon, helium, CO, CO₂ gases… Welding exhaust gas is formed mainly from the evaporation of metal and of solder when molten.

When it cools, this vaporcondenses and reacts with oxygen in the atmosphereto form small, fine molecules. These molecules range in size from 0.01 µm – 1 µm.

These molecules are very toxic to workers. The smaller the molecules, the more dangerous they are.

Welding vapor emissions arise from any activities during the welding process

Gas used in welding and cutting processes include:

• Welding protective gases such as CO₂, argon, helium,…
• Fuel gases such as acetylene, propane, butane…
• Oxygen is used with fuel gases and in small amounts in some shielding gas mixtures

Welding vapor emissions arise from the following activities:

• CO₂ from rosin combustion
• CO is a byproduct of the protective gas CO₂ in arc welding
• O₃ from the interaction of the electric arc with atmospheric oxygen
• NOx from the heating of oxygen and nitrogen in the atmosphere
• HCl and phosgene are produced by the reaction between ultraviolet light and vapors from chlorinated solvents (e.g., trichlorethylene, TCE)

Welding vapor emissions are also generated from thermal decomposition of coating materials :

• Polyurethane coatings can generate HCN, formaldehyde, CO₂, CO, NOx and isocyanate vapor.
• Epoxy coatings can generate CO₂ and CO.
• Vinyl paint may produce HCl.
• Phosphate anti-rust paint can release phosphate during welding.

Welding fumes generated during metal welding

The impact of welding fumes on human health

The U.S. Department of Labor warns that inhalingwelding fumes can causeimmediate and long-term negative effects, including:

• Eye, throat and nose irritation; nausea; and dizziness.
• Metallic vapor fever, with symptoms including cough, muscle and joint pain, fever and chills.
• Kidney damage, stomach ulcers and central nervous system damage.
• Respiratory diseases and lung damage
• Cancer
• Parkinsonian syndrome.
• Discomfort and even suffocation. When gases such as helium, argon and CO₂ replace oxygen in the air in a closed space

The level of toxicity depends onthe material being welded and the welding technologyused. It also depends on where the welder is working.

Illustration of the impact of welding fumes on human health

Welding vapor exhaust treatment system

Based on the pollution factors of welding exhaust gas, we should usewelding exhaust gas treatment plan byempty gas washing tower and coal adsorption active

Welding exhaust gas treatment system

Principles of operation of the welding exhaust gas treatment system

Welding exhaust gas is collected by the hood and leads into the Empty gas washing tower. Here, dust pollution follows the water flow to the bottom of the tower. The welding exhaust gas stream continues to pass through theActivated Carbon Adsorption Tower.

Here, polluted gases, turpentine smell, and burning smell in welding exhaust gas will be adsorbed on the surface of activated carbon. Clean air is discharged through the chimney under pressure driven by a centrifugal exhaust fan.

The amount of water supplied to the gas washing tower flows to the collection tank and is continuously circulated throughout the gas washing process. Because there are polluted dust particles in the water, the water collection tank needs to be periodically replaced with new water.

Wastewater needs to be brought to the factory’s wastewater treatment system.

Advantages and disadvantages of welding exhaust gas treatment system

Contact HASY ENVIRONMENT immediately via 0972221608 or website https://xulymoitruong360.com/ we will answer all your questions about the fieldexhaust gas treatment in general as well as the system welding exhaust gas treatment in particular.