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 Plasma waste gas purification equipment

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Plasma waste gas purification equipment

Low temperature plasma industrial waste gas treatment equipment and technology is a new generation of low-temperature plasma technology, which is based on the original corona discharge and generated by high-frequency and high-voltage electric field. It has the characteristics of high energy and high electron emission density.

Details:

Low temperature plasma industrial waste gas treatment equipment and technology is a new generation of low-temperature plasma technology, which is generated by high-frequency and high-voltage electric field on the basis of the original corona discharge. It has the characteristics of high energy and high electron emission density. Its purification principle is as follows:

During the discharge process, the electrons obtain energy from the electric field and convert the energy into the internal energy or kinetic energy of the pollutant molecules through inelastic collision. These molecules are excited or ionized to form active groups. When the energy obtained by the pollutant molecules is greater than the binding energy of the molecular bond energy, the molecular bond of the pollutant molecule will break and be directly decomposed into simple atoms or simple atoms One atom makes up a harmless gas molecule.

The plasma contains a large number of electrons, positive and negative ions, excited state particles and strong oxidation of post type free radicals. These active particles collide with some exhaust gas molecules and produce a large number of Oh, Ho, O and other active free radicals and oxidizing o, which can react with harmful gas molecules to form harmless products.

The physical action is characterized by charged dust collection. A large number of electrons in the plasma collide with the particulate pollutants inelastic and adhere to their surface, which makes them charged. Under the action of electric field, the particulate pollutants are collected by the dust collector.

The biological effect is manifested in the efficacy of disinfection and sterilization. The mechanism is as follows: the positive and negative particles in the plasma make the shear force of electric energy generated on the surface of microorganism greater than the surface tension of cell membrane, resulting in the destruction of cell membrane and the death of microorganism.

In the process of discharge, the electrons obtain energy from the electric field and convert the energy into the internal energy or kinetic energy of pollutant molecules by inelastic collision. These molecules are excited or ionized to form active groups. At the same time, oxygen and water in the air are in the state of Under the action of electrons, a large number of active groups, such as hydrogen, reactive oxygen and hydroxyl oxygen, can also be produced. These active groups collide with each other and cause a series of complex physical and chemical reactions. It can be seen from the composition of active groups in the plasma that there are rich in chemical active particles, such as electrons, ions, free radicals and excited molecules. The pollutants in the waste gas react with these active groups and finally convert into CO2 and H2 o, so as to achieve the purpose of purifying the waste gas.

Working principle of low temperature plasma

Low temperature plasma technology uses double dielectric barrier discharge to generate plasma, and the density is 1500 times higher than that of other similar technologies. It is used for industrial odor, odor, toxic and harmful gas treatment. This technology can be widely used in petrochemical, waste incineration, pharmaceutical, food, sewage treatment plant, coating, leather processing, photosensitive materials, automobile manufacturing and many other industries, as well as the treatment of waste gas which is difficult to solve by other methods.

The working principle of the technology is as follows:

Working principle of plasma waste gas purification equipment:

In the process of dielectric barrier discharge (DBD), electrons obtain energy from the electric field and convert the energy into the internal energy or kinetic energy of pollutant molecules by collision. These molecules are excited or ionized to form active groups A series of complex chemical reactions of these groups, such as electron and oxygen, can be generated after the collision of these groups. It can be seen from the composition of active groups in the plasma that there are rich in chemical active particles, such as electrons, ions, free radicals and excited molecules. The pollutants in the waste gas react with these active groups and finally convert into CO2 and H2O, so as to achieve the purpose of purifying the waste gas.

The plasma chemical reaction process is as follows

From the above reaction process, it can be seen that the electron first obtains energy from the electric field, and then transfers the energy to the pollutant molecules by excitation or ionization. Those pollutant molecules that obtain energy are excited, and some molecules are ionized to become active groups. Then these active groups collide with oxygen and between active groups to form stable products and heat.

In addition, the electron trapping material with strong electron affinity can also be formed by oxygen. They play an important role in chemical reactions.

Performance advantages of plasma waste gas purification equipment

1. High tech innovative products: "low temperature plasma" technology is an electrochemical process under the comprehensive action of electronics, chemistry and catalysis, which is a new field of technological innovation. It depends on the strong electric field energy produced by plasma in an instant to ionize and crack the chemical bond energy of harmful gas, thus destroying the molecular structure of waste gas and achieving the purpose of purification.

2. Waste gas purification: the equipment can remove volatile organic compounds (VOC), inorganic substances, hydrogen sulfide, ammonia, mercaptan and other major pollutants, as well as a variety of odor, deodorization efficiency can reach More than 98% of the odor, odor accumulated for a long time, can be removed within 24 hours, and has the ability to kill various microorganisms in the air, viruses and other microorganisms, and has an obvious role. The deodorization effect exceeded the emission standard of odor pollutants.

3. There is no need to add any substance: low temperature plasma waste gas treatment is a dry purification process, which is a new purification process. It does not need any additives, does not produce waste water and waste residue, and will not lead to secondary pollution.

4. Strong adaptability: purification function, no need for special care. It can be used for purification treatment of high concentration, atmospheric volume and different gaseous substances. It can be operated in high temperature 250 ℃ and low temperature - 50 ℃. The purification area can still operate normally, especially in humid or even air humidity saturated environment. It can work continuously 24 hours a day with stable long-term operation.

5. Low energy consumption and energy saving: it is one of the core technologies of "low temperature plasma" with low operation cost and power saving. It can process odor of 1000m3 / h and consume only 0.25 degree power. This equipment has no mechanical action, high degree of automation, simple process, simple operation, no need for special management and daily maintenance, automatic shutdown alarm in case of failure, only need to make regular inspection.

6. Strong equipment combination: "low temperature plasma" products are light in weight and small in volume. They can be placed vertically and horizontally according to the site requirements, and can be combined in series and in combination according to the concentration, flow rate and composition of waste gas to achieve waste gas purification.

7. Long service life of the equipment: the equipment is composed of stainless steel, copper, molybdenum, epoxy resin and other materials. It has good corrosion resistance to acid, alkali gas and humid environment. The service life is more than 15 years.

8. The voltage used in the "low temperature plasma" equipment is below 36 v.

Applicable objects and application industries of low temperature plasma waste gas treatment technology:

The plasma waste gas purification equipment produces high electron energy and high free radical density, so most odor molecules can be decomposed, and the treatment objects are wide, which can purify the following substances:

Sulfur containing compounds, such as hydrogen sulfide, mercaptans, dimethyl sulfur, thioethers and sulfur-containing heterocyclic compounds, etc;

Compounds containing nitrogen, such as ammonia, amines, nitriles, nitrocompounds and nitrogen-containing heterocyclic compounds; compounds composed of carbon, hydrogen or carbon, hydrogen and oxygen (lower alcohols, aldehydes, esters, etc.);

Benzene series, such as styrene, benzene, toluene, xylene, etc.; halogen compounds, such as Freon, chloroform, carbon tetrachloride, dichloromethane, etc;

Lipids: such as methyl acetate, ethyl acetate, butyl acetate, methyl acrylate, ethyl acrylate, butyl acrylate, etc.

The main application fields are monosodium glutamate, pharmaceutical chemical industry, sludge drying and other industries.

Air purification treatment in relatively closed and poor air permeability space.

It can remove the eight odorous substances, such as hydrogen sulfide, ammonia, amine, methyl mercaptan, methyl sulfide, carbon disulfide, styrene and dimethyldisulfide.

The equipment can be widely used in petrochemical industry, pharmaceutical industry, feed and fertilizer processing plant, animal husbandry farm, chemical fiber factory, leather factory, pulping plant, sewage pumping station, various sewage treatment plants, coating, food additive plant, leather processing, photosensitive materials, automobile manufacturing, toilet, manure transfer station and other industries And other pollution problems. It can be used not only in the treatment of industrial waste gas, but also in indoor air purification. It is a new type of air environment cleaning technology and product with wide application.


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