How does an exhaust gas treatment plant work?

There are many kinds of waste treatment, mainly dust removal and denitrification.

The equipment and principles of dust removal mainly include the following categories: biological nanofilm, cloud dust suppression, wet dust collection, gravity dust removal, inertial dust removal, cyclone separator dust removal, bag dust removal, electrostatic precipitator removal, etc.

The current method of denitrification is mainly SCR denitrification, which refers to the decomposition of urea solution in the mixed area of the exhaust pipeline when it encounters high temperature flue gas to generate NH3 as the reducing agent, and uses its high selective reducibility to NOx to generate harmless nitrogen (N2) and water (H2O) in the catalytic reaction zone, and the reaction mechanism is as follows. The reaction principle is as follows:

Urea is pyrolyzed and hydrolyzed to produce ammonia gas, which provides raw materials for the reaction.

Urea specific reactions:

Urea pyrolysis reaction: CO(NH2)2 NH3+HNCO(1)Urea hydrolysis reaction: HNCO+2H2O NH3+CO2(2) denitrification principle reaction:

Standard SCR reaction: 4NH3 + 4NO+O2 4NH2+6H2O(3) Fast SCR reaction: 4NH3+2NO2+O2 3N2+6H2O(4) Slow SCR reaction:

8nh3+6no2 → 7n2+12h2o（5）

This is provided by Hebei Zhengyin Steel Structure, and we are happy to answer for you. The types of waste gas treatment equipment selected are different according to different treatment conditions. Commonly used waste gas treatment equipment includes photo-oxygen purifiers, plasma purifiers, activated carbon adsorption boxes, catalytic combustion equipment, welding fume purifiers, oil fume purifiers, etc.

How the photo-oxygen purifier works:

After the odorous gas is input to the photo-oxygen purifier by the exhaust equipment, the equipment uses the UV ultraviolet beam to decompose the oxygen molecules in the air to produce free oxygen, which needs to be combined with the oxygen molecules due to the imbalance of the positrons and negatives carried by the free oxygen, and then produce ozone. The reaction formula is as follows:

UV O2 O-+O (free oxygen) O+O2 O3 (ozone);

The special high-energy and high-ozone performs a synergistic decomposition and oxidation reaction on the odorous gas, so that the odorous gas substances are degraded and converted into low-molecular compounds, water and carbon dioxide, and then discharged outside through the exhaust pipe, so as to achieve the purpose of deodorization and killing.

1) Dilution diffusion method. 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 the odor.

2) Water absorption method. Principle: Using the characteristics of some substances in the odor that they are easily soluble in water, the odor components are directly in contact with the water, so as to dissolve in the water to achieve the purpose of deodorization.

3) Aeration deodorization method. Principle: The odorous substance is dispersed into the mixture containing activated sludge in the form of aeration, and the odorous substance is degraded by the microorganisms grown in suspension The application range is wide.

4) Catalytic oxidation process. Principle: The reaction tower is filled with a special solid packing, and the packing is compounded with a multi-medium catalyst.

When the odorous gas passes through the packing layer under the action of the induced draft fan, it is fully in contact with the liquid-phase compound oxidant sprayed out through the special nozzle in the form of a divergent mist on the surface of the solid-phase packing, and under the catalytic action of the multi-medium catalyst, the pollution factors in the odorous gas are fully decomposed.

5) Low-temperature plasma. Low-temperature plasma is the fourth state of matter after solid, liquid, and gaseous states, and when the applied voltage reaches the ignition voltage of the gas, the gas molecules are broken down, producing a mixture including electrons, various ions, atoms, and free radicals. Although the temperature of the electrons is very high during the discharge process, the temperature of the heavy particles is very low, and the whole system is in a low temperature state, so it is called low-temperature plasma.

Low-temperature plasma degradation of pollutants is to use these high-energy electrons, free radicals and other active particles and pollutants in the exhaust gas to decompose the pollutant molecules in a very short time, and then various subsequent reactions to achieve the purpose of degrading pollutants.

Hello landlord, according to the questions you raised, the following will be answered in detail for you:

Exhaust gas treatment towers

The main function of spray tower, water washing waste gas tower, washing tower and acid mist treatment tower is to reduce the concentration of waste gas through washing, and let the waste gas enter the packing layer through the dosing system, which plays a neutralizing role in acid and alkali waste gas, and is a common equipment for reducing the concentration of waste gas pretreatment. The cyclone tower is a kind of exhaust gas tower, which can make the desulfurization and deacidification more fully by using the role of cyclone, and play the role of desulfurization and deacidification.

Activated carbon adsorption equipment

Enterprises commonly used have activated carbon adsorption box, through the pre-treatment of the waste gas tower, into the activated carbon adsorption box, activated carbon has a good adsorption effect on VOCs waste gas molecular particles, can play a role in purifying the exhaust gas.

Plasma waste gas treatment equipment

The main principle is to release ozone by generating a strong electromagnetic field, so as to decompose odorous gases and achieve good effects of deodorization and oil smoke.

Biological deodorization towers

Also known as biological trickling filter tower, it is a process of absorbing odorous gases, such as sulfide gas, ammonia and other waste gases, and releasing carbon dioxide and water through the cultivation of biological bacteria.

Pulse dust removal equipment

Divided into dry dust removal and wet dust removal, the dry dust collector is mainly for dry dust, using the principle of electromagnetic field, so that the dust is rotated and thrown out under the action of gravity, and then into ash at the bottom of the equipment tower, and then cleaned by mechanical vibration. Wet dust removal equipment, also known as wet electric dust removal, is mainly aimed at wet dust, fine particles, and some odorous bubble dust to clean, and uses spray cleaning to make the dust treatment cleaner and no secondary pollution.

Catalytic combustion equipment

Also known as RCO, the equipment has adsorption and desorption, heat storage, purging, release of heat energy, repeated operation, through the role of catalyst, the general temperature is between 300 -500, so that the exhaust gas is flameless combustion at low temperature, so that the exhaust gas treatment is more complete.

Hope it helps!

The principles of industrial waste gas treatment include activated carbon adsorption method, catalytic combustion method, catalytic oxidation method, acid-base neutralization method, biological washing, biological trickling filtration method, plasma method and other principles. The waste gas treatment tower adopts a five-fold waste gas adsorption filtration and purification system, and the industrial waste gas treatment is carefully designed to purify and filter the waste gas layer by layer, and the effect is good.

Due to the development of China's manufacturing industry in recent years, the air pollution problem of the industrial environment has become increasingly prominent, and the environmental problems of enterprises should be worthy of our attention.

The polluted air first passes through a metal filter, a macromolecular pollutant in the air. The oil mist separator is a combination of eight layers of stainless steel wire mesh, with a thickness of 40mm, which can catch the oil mist particles in the air to the greatest extent and filter pollutants in the air more than 10 microns. The polluted air enters the ionization zone of the electronic unit, and the ionization zone adopts stainless steel sawtooth discharge electrode, which produces a high voltage (positive voltage) of 1200V, which brings a positive charge to the particles in the air.

The air enters the dust collection area of the electronic unit, and the dust collection area is composed of multiple sets of parallel high-voltage plates and grounding plates, due to the existence of a stable electric field in the dust collection area, under the action of the Coulomb force, most of the charged particles are grounded and adhered to the dust collection plate, so as to complete the purification process of the particles. The oil mist particles are adsorbed on the dust collection plate and flow into the oil collection box of the machine, and are exported out of the machine through the oil guide device.

The remaining molecular fractions in the air are purified when they pass through the PC gas filter, and the whole purification process is completed. Beijing Texinda industrial waste gas purifier adopts electrostatic filtration and dry filtration composite purification method, which is professionally used for the purification of air pollutants such as oil mist, welding fume, oil fume, etc., with a purification efficiency of more than 98%.

According to the experience in the environmental protection industry, the multi-medium catalytic oxidation process can be used for VOCs volatile organic waste gas; Combustion treatment, that is, using organic waste gas as a combustion substance, igniting the mixed gas in the equipment or container, and burning off the exhaust gas at high temperature, its technology is more complex; You can also use biological treatment and other methods, and consult environmental protection companies in detail.

How an air purifier works and how it works, come and take a look.

Commonly used waste gas treatment methods include adsorption method, absorption method, catalytic combustion method, thermal combustion method, etc. When selecting waste gas treatment methods, methods with low cost, low energy consumption and no secondary pollution should be preferred according to the specific situation, so as to turn harm into benefit and make full use of ingredients and waste heat.

In most cases, the petrochemical industry adopts condensation, absorption, direct combustion and other methods due to the high exhaust concentration; Due to the low exhaust concentration, adsorption, catalytic combustion and other methods are used in paint construction, printing and other industries.

Waste gas treatment mainly refers to a purification method for the treatment of industrial waste gases such as dust particles, flue gases, odor gases, and toxic and harmful gases generated by industrial sites. Common waste gas treatment includes smoke and dust waste gas treatment, dust waste gas treatment, organic waste gas treatment, waste gas odor treatment, acid and alkali waste gas treatment, etc.

Waste gas treatment equipment is widely used in chemical plants, electronics factories, painting factories, automobile factories, paint factories, petrochemical industries, furniture factories, food factories, rubber factories, plastic factories and other industries.

The main types of gases treated by waste gas treatment are 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 gas treatment and organic waste gas treatment.

Waste gas treatment methods mainly include activated carbon waste gas treatment adsorption method, chemical absorption waste gas treatment method, catalytic combustion waste gas treatment method, thermal combustion waste gas treatment method, plasma waste gas treatment method, etc. When selecting the waste gas treatment method, it should be selected according to the specific situation with low cost, low energy consumption, no secondary pollution, and energy consumption as much as possible, which is conducive to environmental protection.

The above is a summary for you, I hope it can be helpful to you.

Industrial waste gas treatment has always been a problem that plagues everyone, these exhaust gases are highly polluted, long-term exposure will affect the body, and the exhaust gas is directly discharged into the air, which will also have a great impact on air quality.

So what are the organic waste gas treatment methods, and what are the advantages and disadvantages of each?

1. Combustion method.

The catalytic combustion method is suitable for the cleaning of flue gas with low concentration and small wind velocity, and it is necessary to rely on extraction processes such as activated carbon filtration to improve the ignition heat of flue gas, but the water vapor, oil stains and dust in the flue gas are easy to cause problems such as the reduction of the filtration volume of activated carbon, and the application is limited.

2. Adsorption method.

Using the mathematical and physical properties of environmental damage to organic matter, Taizhou waste gas treatment equipment manufacturers carry out adsorption and removal of flue gas. It has a high removal rate and is easy to operate, but it has high facility and operational regulatory requirements, and can only be melted into the adsorbent or contaminant sources that can react with the adsorbate.

3. Biological method.

The advantage of biological methods is that they are cheap and do not pollute the air. However, there are shortcomings such as large gas resistance and slow dissolution rate, and the waste gas treatment method is only suitable for the solution of hydrophilic and easily biodegradable organic matter.

4) Catalytic oxidation process.

The dissolution rate of photo-oxygen catalytic oxidation is lower than the diffusion rate of the surface page of environmentally damaging organic matter and desulfurizer, and the desulfurizer is more expensive.

The treatment of industrial waste gas generally requires the use of centrifugal fans, such as 4-72 centrifugal fans.

Some common organic waste gas treatment methods, such as activated carbon adsorption, PP spray tower, photocatalysis and low-temperature plasma, are some equipment for treating organic waste gas.

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.

Several measures can be used in a few clicks.

Dilution method, the odorous gas is discharged through the chimney at high altitude, or the odorless gas dilution and masking method is used, and the stronger aromatic gas is combined with the odor to mask the odor biological method, and the dissolved pollutants are degraded and dissolved through microbial metabolic activities.

Photocatalytic oxidation uses a special excitation light source to produce different light quanta, which is conducive to the strong absorption of the light quanta by polluting substances, thereby destroying polluting molecules.

The adsorption method uses the adsorption function of the adsorbent to transfer the odorous substances from the gas phase to the solid phase scrubbing method, and the waste gas is passed through water or other solvents, and the principle of dissolution or catalytic oxidation is used to absorb and destroy the pollutant substances.

In the combustion method, the odorous substances are fully mixed with the fuel gas at high temperatures to achieve complete combustion of low-temperature plasma technology, and the particles rich in extremely high chemical activity are generated inside the plasma to react with the pollutant substances in the exhaust gas, and finally converted into substances such as CO2 and H2O.

The construction of waste gas treatment equipment can be classified according to the specific treatment process and equipment structure. At present, the commonly used construction methods of waste gas treatment equipment mainly include the following:

1.Absorption tower: Absorption tower is a kind of equipment that uses liquid sucking wax harvester to absorb harmful components in the exhaust gas. The absorption tower usually consists of an air intake, absorption parts, a bottom exhaust port, and a circulating fluid tank.

2.Denitrification equipment: denitrification equipment is a kind of equipment that uses chemical, physical or biological methods to remove NOx from exhaust gas. The denitrification equipment can adopt different denitrification technologies such as SCR, SNCR, LNB, etc.

3.Activated carbon adsorber: Activated carbon adsorber is a device that uses activated carbon to adsorb harmful gases in exhaust gas. Its construction methods include spray device, suspension device, adsorption bed, extraction device, etc.

4.Electrostatic precipitator: An electrostatic precipitator is a kind of equipment that uses the principle of electric field to remove the local particles in the exhaust gas. Its main components include power supply, dust collection electrode, discharge electrode and control system.

5.Cutter suction air filter: Cutter suction air filter is a kind of equipment that uses high-speed rotating gears to drive air rotation to make dust settle. Its main structure includes air intake, rotor, condenser, exhaust port, etc.

Different waste gas treatment equipment construction methods are suitable for different waste gas types and treatment requirements, and need to be selected according to the specific situation.