Overview of Chemical Waste Gas

Chemical waste gas comes from toxic and harmful gases emitted from chemical plants during chemical production. The composition of chemical waste gas generated by different chemical production industries varies greatly, with many types of pollutants, complex physical and chemical properties, and varying degrees of toxicity, seriously polluting the environment and affecting human health.

Chemical waste gas composition

Chemical waste gas is generally divided into the following three categories:

(1)  Compounds containing sulfur, such as hydrogen sulfide, thiols, dimethyl sulfide, thioethers, and heterocyclic compounds containing sulfur.

(2)  Nitrogen containing compounds, such as ammonia, amines, nitriles, nitro compounds, and nitrogen-containing heterocyclic compounds.

(3)  Compounds composed of carbon, hydrogen, or carbon, hydrogen, and oxygen (lower alcohols, aldehydes, fatty acids, etc.).

The eight major odorous substances that have a significant impact on human health are hydrogen sulfide, ammonia, trimethylamine, methyl mercaptan, methyl sulfide, carbon disulfide, styrene, and dimethyl disulfide. And what we usually refer to as odorous gases refers to gases that diffuse with a foul odor in the air.

Characteristics of chemical waste gas

• 01

  There are many flammable and explosive gases. Such as low boiling point ketones, aldehydes, and easily polymerized unsaturated hydrocarbons, a large amount of flammable and explosive gases can easily cause fire and explosion accidents if appropriate measures are not taken, posing great harm.

• 02

  Most emissions are irritating or corrosive. Gases such as sulfur dioxide, nitrogen oxides, chlorine gas, hydrogen fluoride, etc. are all irritating or corrosive, especially sulfur dioxide has the highest emissions. Sulfur dioxide gas directly damages human health, corrodes the surfaces of metals, buildings, and sculptures, and is also prone to oxidation into sulfates that fall to the ground, polluting soil, forests, rivers, and lakes.

• 03

  There are many types of floating particles in exhaust gas, which pose great harm. The floating particles emitted from chemical production include dust, flue gas, acid mist, etc., with a wide variety of types and significant environmental hazards. Especially when floating particles and harmful gases coexist, they can have a synergistic effect, which poses a more serious threat to humans.

Activated carbon adsorption scheme

When paint exhaust gas enters the adsorption box and enters the activated carbon adsorption layer, due to the presence of unbalanced and unsaturated molecular attraction or chemical bonding forces on the activated carbon adsorption surface, when the surface of the activated carbon adsorbent comes into contact with gas, it can attract gas molecules, causing them to concentrate and remain on the solid surface. This phenomenon is called adsorption. By utilizing the adsorption capacity of activated carbon adsorbent surface, the exhaust gas is brought into contact with the porous activated carbon adsorbent on the large surface. The pollutants in the exhaust gas are adsorbed on the surface of the activated carbon, separated from the gas mixture, and the purified gas is discharged at high altitude.

FEATURES

(1) High adsorption efficiency and strong adsorption capacity;

(2) Capable of simultaneously processing multiple mixed organic waste gases with high purification efficiency;

(3) Small footprint, simple maintenance and management, low operating costs;

(4) Strong adaptability, fully sealed for both indoor and outdoor use, with a wide range of applications;

(5) Adopting an automated control operation design, the operation is simple and safe;

scope of application

Activated carbon adsorption technology is widely used in industries such as petroleum, chemical, rubber, coating, printing, electronics, pharmaceuticals, textile printing and dyeing, food, furniture, coating, plastics, feed, leather, machinery, semiconductor manufacturing, and material synthesis for low concentration and high air volume waste gas treatment.

UV Photolysis Purification Solution

UV photolysis waste gas treatment technology refers to the use of high-energy UV beams to decompose oxygen molecules in the air, producing free oxygen (i.e. reactive oxygen species). Due to the imbalance of positive and negative electrons carried by free oxygen, it needs to combine with oxygen molecules to produce ozone, which has strong oxidizing properties. Through the synergistic photolysis and oxidation of organic waste gas and odorous gases by ozone, organic waste gas and odorous gases are degraded and converted into low molecular compounds, water, and carbon dioxide.

FEATURES

• 01

  Efficient Odor Removal: It can efficiently remove major pollutants such as volatile organic compounds (VOCs), inorganic substances, hydrogen sulfide, ammonia, thiols, as well as various odorous gases, with a deodorization efficiency of over 95%. The deodorization effect exceeds the national odor pollutant emission standards issued in 1993 and the Comprehensive Emission Standards for Air Pollutants issued in 1996.

• 02

  No pre-treatment required: Organic gases do not require special pre-treatment, such as heating, humidification, etc. The equipment can work normally in an environment with a temperature between -30 ℃ and 95 ℃, humidity between 30% and 98%, and pH value between 2-11.

• 03

  No need to add any substances: just set up corresponding exhaust pipes and exhaust power, so that odorous gases and industrial waste gases can be deodorized, decomposed and purified through UV photolysis waste gas purification equipment, without adding any substances to participate in chemical reactions.

• 04

  Strong adaptability: It can adapt to the deodorization and purification treatment of low to medium concentrations and different industrial waste gases, and can work continuously 24 hours a day, with stable and reliable operation.

• 05

  Low operating cost: no mechanical action, no noise, no need for dedicated management and daily maintenance, only regular inspections are required, low equipment energy consumption, low equipment wind resistance<50pa, can save a lot of exhaust power energy consumption.

• 06

  Safe and reliable: Due to the use of photolysis principle and explosion-proof treatment of the module, safety hazards are eliminated, and the fire, explosion, and corrosion resistance are high. The equipment performance is safe and stable, especially suitable for industries with high explosion-proof requirements such as oil (gas) fields, petrochemicals, and pharmaceuticals.

Application scope

Purification treatment of malodorous gases and industrial waste gases such as printing plants, printing and dyeing plants, electronic plants, plastic plants, paint plants, furniture plants, oil refineries, rubber plants, chemical plants, paper mills, leather plants, pesticide plants, pharmaceutical plants, paint plants, fertilizer plants, food processing plants, feed plants, essence and spice plants, slaughterhouses, sewage treatment plants, waste transfer stations, spray painting, etc.

Catalytic combustion scheme

Regenerative thermal oxidation technology heats organic waste gas to above 760 ℃ to oxidize and decompose VOCs in the waste gas into carbon dioxide and water. The high-temperature gas generated by oxidation flows through a specially designed ceramic heat storage body, causing the ceramic body to heat up and "store heat", which is used to preheat the organic waste gas that enters later. Thus saving fuel consumption for exhaust gas heating.

FEATURES

(1) High concentration exhaust gas treatment achieves self heating combustion with low operating costs and reasonable cost-effectiveness.

(2) High purification efficiency, the three chamber RTO can reach 99.5%.

(3) Using ceramic thermal storage as heat recovery, preheating and thermal storage alternate operation, with a thermal efficiency of ≥ 95%.

(4) The steel structure of the furnace body is reliable, the insulation layer is thick, the operation is safe and reliable, and the stability is high.

(5) PLC programmable automation control, with a high degree of automation.

(6) Widely applicable, can purify any organic waste gas

(7) Waste heat utilization with high economic benefits; The excess heat energy is reused in the drying room, oven, etc., and the heating in the drying room does not require additional fuel or electricity consumption.

scope of application

The petroleum, chemical, plastic, rubber, pharmaceutical, printing, furniture, textile printing and dyeing, coating, coating, semiconductor manufacturing, synthetic materials and other industries generate medium to high concentration and high air volume organic waste gas treatment. The types of organic substances that can be treated include benzene, phenols, aldehydes, ketones, esters, alcohols, and soot.