VOCs plasma purification equipment

NegotiableUpdate on 07/09

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Overview

When using plasma to decompose pollutants such as oil mist and exhaust gas, the plasma in the plasma plays a decisive role. The meteor shower like plasma collides non elastically with molecules in the medium (principle), converting energy into the internal energy of ground state molecules (atoms), and undergoing a series of processes such as excitation, dissociation, and ionization to activate the polluted medium. Under the action of plasma, the pollutant medium generates active free radicals, and the activated pollutant molecules are removed through plasma directed chain chemical reactions. When the average energy of ions exceeds the chemical bond binding energy in the contaminated medium, the molecular chain breaks, the contaminated medium decomposes, and is collected under the action of the adsorption field of the plasma generator.

Product Details

Product details:

Degradation mechanism of VOCs exhaust gas plasma purification equipment for gaseous organic pollutants:

There is enough energy to generate free radicals, triggering a series of complex physical and chemical reactions. The gas organic chemical reactions caused by low-temperature plasma are ionization, dissociation, excitation, and atomic reactions that occur in the gas phase The mutual binding and addition reactions between molecules. This energy is sufficient to break the chemical bonds in most gaseous organic compounds, leading to their degradation.

From the perspective of air purification efficiency, we have chosen a device with high corona current to eliminate harmful gases using a combination of pulse corona discharge plasma and adsorption technology. The plasma is mainly used to remove gases such as hydrogen sulfide, ammonia, benzene, toluene, xylene, formaldehyde, acetone, urea, resin, etc. and for disinfection and sterilization, while the adsorption material is mainly used to remove by-products such as carbon dioxide and ozone.

Working mechanism of VOCs exhaust gas plasma purification equipment

Plasma technology is an interdisciplinary and comprehensive technology that integrates physics, chemistry, biology, and environmental science. Its significant feature is that it has physical, chemical, and biological effects on pollutants, and has obvious advantages such as low energy consumption, high efficiency, and no secondary pollution.

The electric field generated by plasma generates electrical energy on the surfaces of various bacteria, viruses, and other microorganisms. The shear force is greater than the surface tension of the cell membrane, causing damage to the cell membrane and leading to microbial death. Therefore, plasma technology has excellent disinfection and sterilization effects. Its purification mechanism includes two aspects: firstly, during the process of generating plasma, the instantaneous high energy generated by high-frequency discharge is sufficient to open up the chemical energy of some harmful gas molecules, causing them to decompose into elemental atoms or harmless molecules; The second is that plasma contains a large number of high-energy electrons, positive and negative ions, excited state particles, and highly oxidizing free radicals. These active particles collide and bind with pollutant molecules, causing them to be in an excited state under the action of an electric field. When the energy obtained by pollutant molecules exceeds the binding energy of their molecular bonds, the chemical bonds of the pollutant molecules break and directly decompose into elemental atoms or harmless molecules composed of a single atom. The large amount of active free radicals such as · OH, · HO2, · O, and highly oxidizing O3 generated simultaneously react chemically with harmful gas molecules, ultimately producing harmless products.

Primary electrons are accelerated in an electric field and collide with oxygen molecules in the air. When the energy exceeds the ionization potential of oxygen molecules, oxygen molecules rapidly ionize. The oxygen molecules that lose electrons become positive polarity oxygen ions (O2+), while the released electrons combine with another neutral oxygen molecule to form negative polarity oxygen ions (O2-). The result is the two-stage differentiation of oxygen ions and the adsorption of neutral oxygen molecules to form ion groups such as O2+, O2-, O2, etc., which have strong oxidizing properties and can quickly oxidize and decompose harmful components in polluted air into harmless products and water;

Under the high-energy action of plasma, a large number of ions, free radicals, and hydroxyl radicals are generated, and the mechanism of generation is as follows:
O2+e（3.6eV）→·O+O H2O+e（5.09eV）→·OH+H- O+·OH→·OH2

Research has shown that the oxidation potential of reactive free radicals · OH (2.8eV) is 35% higher than that of highly oxidizing ozone (2.07eV). ·The reaction rate between OH radicals and organic compounds is several orders of magnitude higher. Moreover, the reaction of · OH radicals to oxidize pollutants is non selective and can trigger a chain reaction, directly oxidizing most harmful substances in polluted air into carbon dioxide, water, or minerals. Its mechanism of action is as follows:

H2S+·OH→HS+H2O HS+O2+O2＋+O2－→SO3+H2O NH3·OH→NH2+H2O

NH2+O2+O2＋+O2→→NOX+H2O CH2O+ O2＋+O2→+·OH→H·COOH+H2O

The high-energy electrons in plasma can cause gas molecules with high electronegativity to carry electrons and become negative ions. It has many good health effects and has a significant impact on the life activities of the human body and other organisms. It is known as the "air vitamin".

Practice has proven that most harmful substances in polluted air at a certain concentration can be oxidized and decomposed in a short period of time, with an average conversion rate of over 95%.