What are the common solutions for exhaust gas treatment?

The second dilution diffusion method of exhaust gas treatment method: deodorization principle: the odorous gas is discharged to the atmosphere through the chimney, or diluted with odorless air to reduce the concentration of odorous substances to reduce odor.

Scope of application: It is suitable for the treatment of medium and low concentrations of odorous gases emitted by organizations. Pros:

Low cost and simple equipment. Disadvantages: susceptible to meteorological conditions, malodorous substances still exist.

Exhaust gas treatment method 3: thermal combustion method and catalytic combustion method: deodorization principle: the odorous substance is fully mixed with the fuel gas at high temperature to achieve complete combustion.

Scope of application: It is suitable for the treatment of flammable gases with low concentration and small air volume. Pros:

The purification efficiency is high, and the odorous substances are completely oxidized and decomposed. Disadvantages: The equipment is easy to corrode, consumes fuel, has high treatment costs, and is easy to form secondary pollution.

The regenerative thermal combustion furnace of Kemaike in Canada is excellent in terms of fuel saving and low disposal cost; At present, it is widely used in automotive coating, petrochemical, pharmaceutical and electronic industries.

Waste gas treatment is also known as waste gas purification. Waste gas treatment refers to the pretreatment of the waste gas generated by industrial sites and factory workshops before it is discharged to the outside world to meet the national waste gas emission standards. General waste gas treatment includes organic waste gas treatment, dust waste gas treatment, acid and alkali waste gas treatment, odor waste gas treatment, air sterilization, disinfection and purification, etc.

Waste gas treatment is also known as waste gas purification. Exhaust gas treatment refers to industrial sites, factory floors. The exhaust gas generated is pretreated before external discharge to meet the national standard of external exhaust gas discharge.

General waste gas treatment includes organic waste gas treatment, dust waste gas treatment, acid and alkali waste gas treatment, odor waste gas treatment, air sterilization, disinfection and purification, etc.

1. It can effectively remove benzene, toluene, xylene, ethyl acetate, acetone, butanone, ethanol, acrylic acid, formaldehyde and other organic waste gases, hydrogen sulfide, sulfur dioxide, ammonia and other acid and alkali waste gases produced in the factory workshop. Second, it depends on how the competent department of the industry recommends. As an industry authority, the credibility of the recommendation is relatively high.

Third, it depends on the principle of waste gas treatment. There are many waste gas treatment methods, such as activated carbon adsorption method, high-temperature catalytic combustion, condensation method, wet method, biological method, etc. Most of the companies in the market will have many success stories.

Fifth, it depends on the brand. Looking at the company's reputation and effect matching, whether it has won the provincial and ministerial level environmental purification association key recommended excellent waste gas treatment company, local ** waste gas treatment high-tech environmental protection company and other titles with relatively high gold content. One of the exhaust gas treatment methods is the masking method

Deodorization principle: a stronger aromatic odor is mixed with odor to mask the odor and make it acceptable to people. Scope of application:

It is suitable for occasions where it is necessary to immediately and temporarily eliminate the influence of low-concentration odor gas, and the odor intensity is about and around, and there is no unorganized emission source. Advantages: Odor effects can be eliminated as soon as possible, flexibility and low cost.

Disadvantages: The foul-smelling components are not removed.

The fourth water absorption method of waste gas treatment method: deodorization principle: the use of some substances in the odor is easily soluble in water, so that the odor components are directly in contact with water, so as to dissolve in water to achieve the purpose of deodorization.

Scope of application: water-soluble, odorous gas from organized emission sources. Pros:

The process is simple, the management is convenient, the equipment operation cost is low, and the secondary pollution is generated, and the washing liquid needs to be treated. Disadvantages: The purification efficiency is low, it should be used in combination with other technologies, and the treatment effect on mercaptans, fatty acids, etc. is poor.

Waste gas treatment method 5 liquid absorption method: deodorization principle: use the characteristics of chemical reaction between certain substances and liquid medicine in the odor to remove certain odor components.

Scope of application: It is suitable for treating atmospheric volume and odor of high and medium concentration. Pros:

It can deal with certain odor components in a targeted manner, and the process is relatively mature. Disadvantages: The purification efficiency is not high, the absorbent is consumed, and it is easy to form secondary pollution.

At present, the waste gas treatment technologies on the market include absorption method, adsorption method, combustion method, etc. Therefore, the choice of waste gas treatment equipment should be made according to the situation of the enterprise and the performance of the equipment.

In most cases, the petrochemical industry uses combustion technologies due to high exhaust gas concentrations, such as RTO exhaust gas incinerator equipment;

Due to the low exhaust concentration, the paint construction, printing and other industries adopt adsorption and combustion technologies, such as activated carbon adsorption, catalytic combustion and other methods.

Common waste gas treatment methods include UV photolysis method, activated carbon adsorption method, catalytic combustion method, catalytic oxidation method, acid-base neutralization method, plasma method and other treatment principles and industrial waste gas treatment methods.

UV photolysis method.

UV photolysis waste gas treatment equipment adopts the most advanced technology concept in the world, which can decompose toxic and harmful substances in industrial waste gas, and can achieve deodorization and purification effects.

Catalytic combustion.

Catalytic combustion method is a method that uses the heat released by the catalyst to promote the combustion of auxiliary fuels such as gas or oil to heat the mixed gas to a certain temperature (700 800) and stay for a certain time (seconds), so that the combustible harmful substances are decomposed into harmless substances at high temperature. Advantages: The direct combustion method has a simple process, small equipment investment, and is suitable for waste gas treatment with high concentration and small air volume.

Catalytic oxidation.

Catalytic oxidation is the process of raising the temperature of the exhaust gas to the temperature of combustible pollutants and making it fully oxidize and decompose. Advantages: It is suitable for the purification of waste gas with low content of combustible organic substances, and the thermal efficiency is very high in the combustion purification treatment technology, the equipment has a long service life, anti-aging and corrosion resistance.

Acid-base neutralization.

The acid-alkali neutralization method is usually applied to the treatment of acid-alkaline waste gas, and the acid-alkali waste gas scrubber is the use of acid-alkali neutralization principle, the acidic (alkaline) waste gas and the spray alkali solution (acid) neutralization reaction, the gaseous pollutants are converted into salts, and the sewage is discharged into the sewage treatment system for treatment. After spraying treatment, the exhaust gas emission reaches the atmosphere, and the treatment efficiency of the first-stage spray tower can reach more than 90%.

1. The best environmental protection equipment for processing industrial waste gas and dust collection is the washing tower. It is produced on the basis of the improvement of the floating packing layer gas purifier, which is widely used in the pre-treatment of industrial waste gas purification and dust removal, and the purification effect is very good. The scrubber is mainly used in air pollution prevention and control engineering, dust collection treatment system engineering and oil fume treatment pipeline exhaust engineering.

2. Combustion method. This method is also known as thermal oxidation method and thermal combustion method, and is mainly used for the purification of high-concentration VOCs exhaust gas. For medium and low concentration exhaust gases that cannot be burned by themselves, accelerants or heating are usually required, which consumes a lot of energy and the operating cost is more than 10 times higher than that of catalytic combustion. The operation technology is demanding, and it is not easy to control and master.

This method has basically not been promoted in China, and only a few manufacturers have introduced foreign treatment equipment to be used in the waste gas treatment of the canning and printing iron industry with higher concentration and temperature, but it is difficult to operate normally due to high energy consumption and unstable operation.

Commonly used methods for organic waste gas treatment.

1. Condensation method: the organic waste gas is directly introduced into the condenser through adsorption, absorption, deplatement, separation, which can be the most valuable organic matter, the method is suitable for the working conditions of high organic waste gas concentration, low temperature and small air volume, and requires auxiliary refrigeration equipment, which is mainly used in the pharmaceutical and chemical industries, and is rarely used by printing enterprises.

2. Direct combustion method: the mixed gas is heated by using auxiliary fuels such as gas or fuel oil to decompose harmful substances into harmless substances under the action of high temperature; This method has a simple process and small investment, and is suitable for exhaust gas with high concentration and small air volume, but it has high requirements for safety technology and operation.

1. Activated carbon adsorption process.

Because there are unsaturated molecular bonds on the surface of activated carbon, activated carbon has a strong adsorption capacity, when the waste gas molecules come into contact with the activated carbon, the organic waste gas will be adsorbed by the activated carbon, and the filtered waste gas can be discharged up to the standard.

2. Regenerative catalytic combustion.

Regenerative catalytic combustion equipment and regenerative incinerator are one of the regenerative combustion equipment, and there are two-chamber, three-chamber, five-chamber and seven-chamber regenerative combustion equipment according to the number of regenerative chambers. The regenerative exhaust gas treatment method does not require additional fuel combustion, so it is a very energy-saving exhaust gas treatment equipment.

3. Liquid washing purifies exhaust gas.

The corresponding equipment is the exhaust gas purification tower, the entrance of the exhaust gas is at the bottom of the exhaust gas purification tower, runs through the tower body from the bottom to the top, and the exhaust gas is absorbed and purified through a single layer or multi-layer packing, and the clean exhaust gas will be discharged from the system above the top of the tower, and the exhaust gas purification tower treats the exhaust gas mainly through the neutralization reaction between the absorption liquid and the exhaust gas to achieve the purpose of purification.

4. Chemical reaction method.

The characteristics of neutralizing reaction of certain substances and chemical liquids in the exhaust gas are used to remove polluting components in the gas. The common ones are acid-base washing, chlorine washing, and hydrogen peroxide washing. Pros:

It can widely remove a variety of odorous gases and achieve high removal efficiency; It has strong operability.

5. Soil deodorization method.

The mechanism of soil deodorization can be mainly divided into two categories: physical adsorption and biological decomposition, water-soluble odorous gases (such as amines, hydrogen sulfide, low-grade fatty acids, etc.) are absorbed and removed by water in the soil, while insoluble odors are physically adsorbed by the soil surface and then decomposed by microorganisms in the soil. Advantages: Low maintenance costs, deodorization effect comparable to activated carbon.

6. UV ultraviolet method.

The special high-energy and high-ozone UV ultraviolet beam is used to irradiate the odorous gas, change the molecular structure of the odorous gas, and make the molecular chain of organic or inorganic polymer odorous compounds degrade and convert into low-molecular compounds under the irradiation of high-energy ultraviolet beams. Advantages: small footprint, low operating costs, low equipment investment.

7. Low temperature plasma method.

Under the action of the external electric field, the electrons in the electrode space accelerate their movement after gaining energy, which triggers a series of complex physical and chemical reactions such as excitation, dissociation or ionization, which makes the chemical bonds of the odor-producing groups break, and then achieves the purpose of deodorization through multi-stage purification. Advantages: simple process, simple operation, wide range of gas temperature (-50-50).

Greenstar environmental protection official account for you to answerRegarding "what are the general methods of waste gas treatment", the following is an introduction to more than 10 waste gas treatment methods, as follows:

Masking method, dilution diffusion method.

Thermal combustion.

Catalytic combustion.

Water absorption method. Liquid absorption method.

Adsorption method, biological filter type deodorization method.

Bio-trickling filter type.

Scrubbing activated sludge deodorization method.

Aeration activated sludge deodorization method, etc.

If you are looking for waste gas treatment, I recommend finding a manufacturer with rich professional experience, because this can reduce your time and cost, and can give you a lot of suggestions on how to solve the waste gas and meet the emission standards.

At present, the state control environment is quite strict, and fines of hundreds of thousands or millions are imposed at every turn, so environmental issues are extremely important.

Personal suggestion: In this regard, I suggest you look for manufacturers in the Kunshan area, Aunason Environmental Protection Company focuses on waste gas treatment and provides one-stop solutions, you can consider it.

I'll give you an example of organic waste gas bar You can use Wanchuan environmental protection UV photolysis purifier It can effectively help you solve organic waste gas, high efficiency and small size. The principle of Wanchuan environmental protection UV photolysis purifier: 1

Ultraviolet light in a specific wavelength band (nanometer) breaks down the molecular chain of the odorous gas, breaking down its macromolecular structure into a small molecular structure. 2.Ultraviolet light in a specific wavelength band (185 nm) causes oxygen molecules in the air to produce reactive oxygen species, i.e., free oxygen.

Because there is an imbalance of positive and negative electrons carried by free oxygen, it combines with oxygen molecules in the air to form ozone. 3.Under the influence of the catalyst titanium dioxide (TiO2), ozone oxidizes the broken foul-smelling gas molecules into inorganic substances such as carbon dioxide (CO2) and water (H2O).

4.The types of gases treated by Wanchuan environmental protection UV photodeodorization equipment: ammonia, hydrogen sulfide, carbon trichloride, hexoctane, acetone, methanol, methyl ethyl ketone, tert-butyl methyl ether, dimethoxymethane, dichloromethane, chloroform, methyl isopropyl ketone, isopropanol, tetrachloroethylene, trimethylamine, methyl sulfide, methyl mercaptan, methyl sulfide, styrene, dimethyl disulfide, carbon disulfide, sulfide, benzene, toluene, xylene, etc.

a.Filtration adsorption oil fume purification:

Filtration adsorption oil flue gas purification equipment can use organic polymer composite fabrics or felt, inorganic filter materials with high oil absorption performance (hydrophobic perlite, ceramsite, coke, etc. used alone or in combination), the filter material can be placed perpendicular or parallel to the direction of flue gas flow, and the purification efficiency needs to reach more than 80.

b.Electrostatic fume purification:

The electrostatic deposition method is to introduce the oil flue gas into a high-voltage electric field, so that the particulate matter in the oil smoke and fire smoke is charged, and moves to the dust collection pole under the action of the electric field force and deposits. The purification efficiency can usually reach more than 85%, and the pressure drop is small.

c.Low-temperature plasma method:

The principle is to use the high-voltage electrostatic method at the same time, set up a plasma field at the front end of the electrostatic field, and use the large number of free radicals excited by its high energy to degrade the oil smoke particles and reduce their viscosity. In the process of plasma generation, the instantaneous high energy generated by high-frequency discharge can open the chemical bonds of some harmful gases, causing them to decompose into elemental atoms or harmless molecules. This technology is the most advanced oil smoke and fire smoke treatment technology on the market, with a high removal rate (below 90), no peculiar smell after treatment, easy maintenance, but high equipment investment.