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Recommended waste gas treatment equipment and waste gas composition

Views:8     Author:China Xicheng     Publish Time: 2021-07-21      Origin:China Xicheng

Painting exhaust

Swirl tower + wet scrubber system series treatment. 2. Swirl tower + demister box + activated carbon box. (Add dimethylformamide and triethanolamine in the tower) PH value is about 7-9.

Paint spray exhaust gas composition: spray paint exhaust gas and drying paint exhaust gas composition: benzene, toluene, xylene, hexane, heptane, methyl ethyl ketone, ethyl acetate, carbon tetrachloride, etc., mainly "triphenyls" , Treatment of volatile organic waste gas (VOCs).


Flue gas

Spray tower + oil fume purifier + activated carbon. Note: It is not water mist smoke, but colored smoke. If the smoke has no odor, you can use activated carbon. The temperature should not be too high (normal temperature 70 degrees), and dimethyl formamide should be added to the spray tower.

The composition of flue gas is very complex. The gas includes water vapor, sulfur dioxide, nitrogen, oxygen, carbon monoxide, carbon dioxide, hydrocarbons, and nitrogen oxides. The flue dust includes fuel ash, coal particles, oil droplets, and high-temperature cracking products.


Injection waste gas

Horizontal wet scrubber + activated carbon. Add triethanolamine to the wet scrubber.

Ingredients: The injection molding machine produces organic waste gas during the heating process of injection molding, and its main components are dust particles, non-methane total hydrocarbons and other harmful substances. The exhaust gas has a pungent odor and slightly toxic, which is harmful to human health. Unorganized discharge of styrene, toluene, organic waste gas, etc. will cause serious pollution to the environment, so it must be discharged after waste gas treatment.

No odorous dust exhaust gas, (inorganic dust)

Swirl tower + primary filter. Add lye or dimethyl formamide to the tower, change the filter cotton frequently, and prepay the blockage. The swirl tower is separated from the water tank, and the water tank is at the bottom of the tower.

Composition: Dust refers to solid particles suspended in the air. Traditionally, there are many names for dust, such as dust, dust, smoke, mineral dust, sand, powder, etc. Inorganic dust: mineral dust, such as quartz, asbestos, talc, coal, etc.; metallic dust, such as iron, tin, Aluminum, manganese, lead, zinc, etc.; artificial inorganic dust, such as emery, cement, glass fiber, etc.


Smelly dust exhaust gas (organic dust)

Swirl tower + primary filter + activated carbon. Add triethanolamine in the tower and change filter cotton frequently. The swirl tower is separated from the water tank, and the water tank is at the bottom of the tower.

Composition: Dust refers to solid particles suspended in the air. Traditionally, there are many names for dust, such as dust, dust, smoke, mineral dust, sand, powder, etc., organic dust: animal dust, such as hair, silk, bone, etc.; plant dust, such as cotton, linen, Grass, sugar cane, grain, wood, tea, etc.; artificial organic dust, such as organic pesticides, organic dyes, synthetic resins, synthetic rubber, synthetic fibers, etc.

Six; Acidic waste gas; wet scrubber + filler spray tower, spray tower with lye, if the waste gas concentration is not high, use a spray tower, if the waste gas is smelly, add activated carbon for treatment.

Ammonia (NH3)

wet scrubber, just wash with water, or add dilute sulfuric acid in the tower.

Composition: A compound of nitrogen and hydrogen, with the molecular formula NH₃, a colorless gas with a strong pungent odor. Easily soluble in water, 1 volume of water can dissolve 700 times the volume of ammonia under normal temperature and pressure. The aqueous solution is also called ammonia


Hydrogen sulfide waste gas

Packed bed scrubber + wet scrubber, add lye, PH value is about 7, low concentration, one spray tower treatment. The composition and molecular formula are H2S, and the molecular weight is 34.076. Under standard conditions, it is a flammable acid gas. It is colorless and has the odor of rotten eggs at low concentrations. It has odor at very low concentrations and is highly toxic (LC50=444ppm< 500ppm). Its aqueous solution is hydrogen sulfuric acid.


VOC organic waste gas

Packed bed scrubber + activated carbon box, spray tower with triethanolamine, the concentration of PH value is about 7-9.

Composition: Outdoor VOC mainly comes from fuel combustion and transportation; indoors mainly come from combustion products such as coal and natural gas, smoke from smoking, heating and cooking, building and decoration materials, furniture, household appliances, detergents and emissions from the human body, etc. . Tobacco industry: inks, organic solvents; textile industry: glue used in footwear products; toy industry: correction fluids, scented toys; furniture decoration materials: paint, paint, adhesives. Auto parts materials: glue, paint, electronic and electrical industries : When used at higher temperatures, it will emit VOCs, cleaning solvents for electronic hardware, other: detergents, detergents, fabric softeners, cosmetics, office supplies, wallpapers and other decorations, etc.


Domestic waste gas

Packed bed scrubber + activated carbon, spray tower plus dimethyl formamide, and the dosing ratio is 1% of the water.

Composition: Domestic waste is sorted into: organic matter, inorganic matter, metal, polymer, etc.


Waste gas

Packed bed scrubber + oil fume purifier + activated carbon, dimethyl formamide is added to the spray tower, and the dosing ratio is 1% of the water. The temperature must not exceed 70 degrees.

Composition: 1. Sulfur dioxide SO2, 2. The main hazards of suspended particulate matter TSP (such as dust, smog, PM10). 3 Nitrogen oxides NOx. 4. Toxic trace organic pollutants, organic pollutants (such as polycyclic aromatic hydrocarbons, polychlorinated Biphenyl, dioxins).


Acid exhaust gas contains

1. Hydrochloric acid (hydrogen chloride (HCl and hydrochloric acid are different concentrations of hydrogen chloride aqueous solutions, which are transparent, colorless or yellow, with pungent odor and strong corrosiveness), 2. Nitric acid (HNO3 nitric acid is a kind of strong oxidizing and corrosive Strong acid), 3. Sulfuric acid: (H₂SO₄ anhydrous sulfuric acid is a colorless oily liquid that crystallizes at 10.36°C. When mixed with water, it also releases a lot of heat energy. It is strongly corrosive and oxidizing), 4. Strong acid is mainly Refers to permanganic acid, hydrochloric acid (hydrochloric acid), sulfuric acid, nitric acid, perchloric acid, selenic acid, hydrobromic acid, hydroiodic acid, chloric acid, of which perchloric acid, hydroiodic acid, hydrobromic acid, hydrochloric acid (hydro Chloric acid), sulfuric acid, and nitric acid are collectively called the six strong inorganic acids. They all have strong stimulating and corrosive effects. Among them, perchloric acid, hydroiodic acid, hydrobromic acid, hydrochloric acid (hydrochloric acid), sulfuric acid, and nitric acid are collectively called Six major inorganic strong acids, they all have strong irritation and corrosive effects. Human contact can cause severe burns. It is advisable to rinse with clean water or soda water. 5. Weak acids (HA common weak acids are: H2SiO3 (metasilicate), HCN (hydrogen cyanide) Acid), H2CO3 (carbonic acid), HF (hydrofluoric acid, less common), CH3COOH (also C2H4O2 acetic acid, also called acetic acid), H2S (hydrogen sulfuric acid), HClO (hypochlorous acid), HNO2 (nitrous acid, more Rare), all organic acids in the middle school range, HONC (fulmic acid), etc.)


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