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Recommended waste gas treatment equipment for different waste gases

Views:7     Author:China xicheng     Publish Time: 2021-05-10      Origin:China xicheng

1. Painting exhaust gas

The main components of painting exhaust gas: Benzene, toluene, xylene, hexane, heptane, methyl ethyl ketone, ethyl acetate, carbon tetrachloride, etc.

Recommended equipment:

(1) Treatment method of combination of swirl tower + packed spray tower

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

These two sets of programs mainly deal with the "triphenyl" and volatile organic waste gas (VOCs) in such waste gas.

Installation and commissioning of wet scrubber


2. Flue waste gas

The composition of flue gas is very complex, mainly composed of two parts: gas and dust.

Gases mainly include: water vapor, sulfur dioxide, nitrogen, oxygen, carbon monoxide, carbon dioxide, hydrocarbons, and nitrogen oxides.

The smoke and dust mainly include: fuel ash, coal particles, oil droplets, and high-temperature cracking products.

Recommended equipment:

(1) Spray tower + oil fume purifier + activated carbon.

This set of equipment can target the gas components in the flue gas and effectively remove the smoke and dust in the flue gas, with a removal efficiency of up to 98%.

Note: 

a. It is not water mist flue gas, but colored flue gas. If the flue gas has no odor, activated carbon is not necessary. 

b. The temperature cannot exceed 70 degrees at room temperature. 

c. Dimethylformamide should be added into the spray tower.


3.Injection waste gas

Main ingredients: organic waste gas, styrene and toluene.

The injection molding machine generates 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. non-organization discharged of styrene, toluene, organic waste gas, etc. will cause serious pollution to the environment, so it is necessary to discharge exhaust gas after treatment through.


4. Dust waste gas without odor (inorganic dust)

Main ingredients: Dust, refers to solid particles suspended in the air. There are many names for dust, such as dust, dirt, smoke, mineral dust, sand dust, 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.

Recommended equipment:

(1) Swirl tower + primary filter

Note: 

a. The lye or dimethyl formamide is added into the cyclone tower, the filter cotton should be replaced frequently to prevent clogging. 

b. The swirl tower is separated from the water tank, and the water tank is at the bottom of the tower.

5. Smelly dust exhaust gas (organic dust)

Main ingredients: Dust, refers to solid particles suspended in the air. There are many names for dust, such as dust, dirt, smoke, mineral dust, sand dust, powder, etc. Organic dust: animal dust, such as hair, silk, bone, etc. Plant dust, such as cotton, hemp, grass, sugar cane, grain, wood, tea, etc. Artificial organic dust, such as organic pesticides, organic dyes, synthetic resins, synthetic rubber, synthetic fibers, etc.

Recommended equipment:

(1) Swirl tower + primary filter + activated carbon

Note: 

a. The Triethanolamine is added into the cyclone tower, the filter cotton should be replaced frequently to prevent clogging. 

b. The swirl tower is separated from the water tank, and the water tank is at the bottom of the tower.

6. Acidic waste gas

Acidic exhaust gas comprising:

(1) Hydrochloric acid: hydrogen chloride and hydrochloric acid are hydrogen chloride aqueous solutions of different concentrations, which are transparent, colorless or yellow, with pungent odor and strongly corrosive).

(2) Nitric acid: nitric acid is a strong acid with strong oxidizing and corrosive properties.

(3) Sulfuric acid: (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. It is highly corrosive and oxidizing).

(4) Strong acids mainly refer to permanganic acid, hydrochloric acid (hydrochloric acid), sulfuric acid, nitric acid, perchloric acid, selenic acid, hydrobromic acid, hydroiodic acid, and chloric acid, among which perchloric acid, hydroiodic acid, hydrobromic acid, and hydrochloric acid (Hydrochloric acid), sulfuric acid, and nitric acid are collectively called six strong inorganic acids. They all have irritating solid and corrosive effects. Among them, perchloric acid, hydroiodic acid, hydrobromic acid, hydrochloric acid (hydrochloric acid), sulfuric acid, nitric acid They are called six strong inorganic acids. They all have strong irritation and corrosive effects. Human body contact can cause severe burns. It is advisable to rinse with clean water or soda water.

(5) Weak acid: HA common weak acids are: H2SiO3 (metasilicic acid), HCN (hydrocyanic acid), H2CO3 (carbonic acid), HF (hydrofluoric acid, less common), CH3COOH (also C2H4O2 ), H2S (Hydrogen sulfuric acid), HClO (hypochlorous acid), HNO2 (nitrous acid), all organic acids within the middle school range (the middle school does not learn organic strong acids), HONC (fulmic acid), etc.

(6) Sulfuric acid (H2SO4), nitric acid (HNO3), perchloric acid (HClO4), hydrochloric acid (HCl), hydrobromic acid (HBr), hydroiodic acid (HI), perbromic acid (HBrO4), chloric acid (HClO3), bromine Acid (HBrO3), fluorosilicic acid (H2SiF6), chlorolead acid (H2PbCl6), metaphosphoric acid (HPO3), osmic acid (OsO4·2H2O or written as H2[OsO4(OH)2]), permanganic acid (HMnO4), Selenic acid (H2SeO4), ferric acid (H2FeO4), fluoboric acid (HBF4), fluorosulfonic acid (HSO3F), cyanic acid (HOCN), thiocyanic acid (HSCN), metaperiodic acid (HIO4)

(7) Strong organic acid 2,4,6-Trinitrophenol (picric acid, HC6H2N3O7), 2,4,6-trinitrobenzoic acid (pyropicric acid, HC7H2N3O8), trifluoroacetic acid (TFA, CF3COOH), trichloroacetic acid ( CCl3COOH), methanesulfonic acid (CH3SO3H), benzenesulfonic acid (C6H5SO3H), KMD acid (cyclohexyl mercaptan sulfonic acid, C6H10(SH)SO3H is C6H12S2O3), 2-chloroethanethiol (CH3CHClSH, generally regarded as a strong acid)

(8) Super acid: Fluoroantimonic acid (HSbF6, a mixture of proton acid SbF5 and HF), fluoroantimony sulfonic acid (SbF6SO3H commonly known as magic acid), perfluorosulfonic acid resin (Nafion-H), chlorofluoroaluminate (HAlCl3F, containing complex ion AlCl3F-) , Carborane acid (H[CHB11Cl11]), Tribble volatile acid (HBr·HI·H2Te·13H2O, or H4Ph), ZXQ acid (CF3OH·2CrO2Cl2), solid super acid (such as FeCl3·HClO4·SiO2· nH2O)

Recommended equipment:

(1) Packing spray tower + packing spray tower

Note: The lye is added into the spray tower. If the exhaust gas concentration is not high, use a spray tower. If the exhaust gas has a bad smell, add activated carbon for treatment.


7. Ammonia (NH3)

Main ingredients: 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.

Recommended equipment:

(1) Packing spray tower

Note: The spray tower can be cleaned with water or dilute sulfuric acid.

8. Hydrogen sulfide waste gas

Main components: The molecular formula of hydrogen sulfide is H2S and the molecular weight is 34.076. Under standard conditions, it is a flammable acid gas. It is colorless and has the smell of rotten eggs at low concentrations. It has a odor at very low concentrations and is highly toxic ( LC50=444ppm<500ppm). Its aqueous solution is hydrogen sulfuric acid.

Recommended equipment:

(1) Packing spray tower

Note: Add lye to the tower. Generally suitable for the treatment of hydrogen sulfide waste gas with a PH value of about 7 and a low concentration.

9. VOC organic waste gas

Main components: VOC outdoor mainly comes from fuel combustion and transportation; Indoors are mainly from combustion products such as coal and natural gas, smoke from smoking, heating and cooking, and emissions from construction and decoration materials, furniture, household appliances, detergents, and the human body. Tobacco industry: inks, organic solvents. Textile industry: glue used in footwear products. Toy industry: correction fluid, scented toys. Furniture decoration materials: coatings, paints, adhesives. Auto parts materials: glue, paint. Electronic and electrical industry: when used at higher temperatures, it will volatilize VOC and electronic hardware cleaning solvents. Others: detergents, cleaners, fabric softeners, cosmetics, office supplies, wallpapers and other decorations, etc.

Recommended equipment:

(1) Packing spray tower + activated carbon box

Note: Triethanolamine is added to the spray tower, and the pH value is about 7-9.


10. Domestic waste gas

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

Recommended equipment:

(1) Packing spray tower + activated carbon box

Note: Add dimethylformamide to the spray tower, and the dosage is 1% of the water.

activated carbon box

11. Waste gas from burning garbage

Main components: 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 and organic pollutants (such as polycyclic aromatic hydrocarbons, Chlorinated biphenyls, dioxins).

Recommended equipment:

(1) Packing spray tower + oil fume purifier + activated carbon box

Note: Dimethylformamide is added to the spray tower, and the dosage is 1% of the water. The temperature must not exceed 70 degrees.


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