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What Is Low Temperature Plasma?

2021-05-08 20:09:42Read:357
 
Low temperature plasma introduction:

1. The mechanism of low-temperature plasma to remove bad odors

In the plasma chemical reaction process, the energy transfer in the reaction process where the plasma transfers chemical energy is roughly as follows:
(1) Electric field + electron → high energy electron
(2) High-energy electron + molecule (or atom) → (excited atom, excited group, free group) active group
(3) Active group + molecule (atom) → product + heat
(4) Active group + active group → product + heat

It can be seen from the above process that electrons first obtain energy from the electric field, and transfer the energy to molecules or atoms through excitation or ionization. The energy-obtained molecules or atoms are excited, and at the same time, some molecules are ionized to become active groups; Then these active groups collide with molecules or atoms, active groups and active groups to generate stable products and heat. In addition, high-energy electrons can also be captured by substances with strong electron affinity such as halogens and oxygen, and become negative ions. Such negative ions have good chemical activity and play an important role in chemical reactions.


2. The principle of low-temperature plasma to remove bad smells
The principle of low-temperature plasma technology to treat pollutants is: under the action of an external electric field, a large number of energy-carrying electrons generated by dielectric discharge bombard the pollutant molecules to ionize, dissociate and excite, and then trigger a series of complex physics, The chemical reaction transforms complex macromolecular pollutants into simple small molecule safety substances, or transforms toxic and harmful substances into non-toxic, harmless or low-toxic substances, so that the pollutants can be degraded and removed. Because the average energy of the electrons produced after ionization is 10ev, proper control of the reaction conditions can achieve very fast chemical reactions that are difficult to achieve or are very slow under normal circumstances. As a high-tech with strong potential advantages in the field of environmental pollution treatment, plasma has attracted great attention from related disciplines at home and abroad.


3. Application of low temperature plasma technology in environmental engineering
Application of low-temperature plasma technology in waste gas treatment. With the development of industrial economy, the odorous and odorous gases produced by sewage plants, pharmaceuticals, garbage transfer stations, fermentation and other industries are also increasing. These waste gases will not only stay in the atmosphere for a long time. , It will spread and drift to farther places, causing serious pollution to the environment. These exhaust gases are inhaled into the human body and directly cause great harm to human health; in addition, the uncontrolled emission of industrial flue gas makes the global atmospheric environment Deteriorating day by day, the harm of acid rain (mainly from sulfur oxides and nitrogen oxides emitted by industries) has attracted the attention of all countries. The acidification of the atmosphere due to pollution has led to the destruction of the ecological environment. Major disasters frequently occur, causing huge losses to human beings. Therefore, it is imperative to choose an economical and feasible treatment method.

The traditional treatment methods for the degradation of malodorous and peculiar gases, such as absorption, adsorption, condensation and combustion, are difficult to achieve for low-concentration malodorous and peculiar gases. The photocatalytic degradation of malodorous and peculiar gases has the problem of easy catalyst deactivation. Low-temperature plasma treatment is used The offensive odor can be free from the restriction of the above conditions and has potential advantages. But because plasma is an interdisciplinary subject that includes basic disciplines such as discharge physics, discharge chemistry, chemical reaction engineering, and vacuum technology. Therefore, there are very few units that can maturely master this technology. Most of the propaganda about the use of low-temperature plasma technology to treat exhaust gas is not a true low-temperature plasma exhaust gas treatment technology.


Applicable objects and application industries
The low-temperature plasma industrial exhaust gas purification complete equipment developed by KLEAN can effectively purify the following substances:

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

◆ Nitrogen-containing compounds, such as ammonia, amines, nitriles, nitro compounds and nitrogen-containing heterocyclic compounds, etc.; 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-containing 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 of super-saturated odor-containing moisture produced by cooking and fermentation; monosodium glutamate, pharmaceutical, chemical, sludge drying and other industries.

◆ Air purification treatment in a relatively closed and poorly air-permeable space.

◆ It can effectively remove hydrogen sulfide, ammonia, trimethylamine, methyl mercaptan, methyl sulfide, carbon disulfide, styrene, and dimethyl disulfide, which are the eight major malodorous substances specified in the National Odor Pollution Control Standard.

The equipment has a wide range of applications, and can be used in petrochemical, pharmaceutical industries, feed and fertilizer processing plants, animal husbandry products farms, chemical fiber plants, leather factories, pulp mills, sewage pumping stations, various sewage treatment plants, paints, and food additives Pollution problems such as organic waste gas, peculiar smell and foul odor exist in many industries such as factories, leather processing, photosensitive materials, automobile manufacturing, public toilets, and fecal transfer stations. It can be applied to the treatment of industrial waste gas and indoor air purification, etc. It is a new type of air environment cleaning technology and product with a very wide range of uses.

4. Whether it is a simple method of judging whether it is a low-temperature plasma treatment technology

At present, there are many products and technologies promoting low-temperature plasma exhaust gas treatment in various media, but most of the promotion of these products is about the concept of low-temperature plasma. How to judge whether it is a true low-temperature plasma technology? You can use the following two simple rules to judge, even if you don't understand low temperature plasma technology, you can judge whether it is true or not.

(1) The exhaust gas treatment channel must be filled with low-temperature plasma. This rule is very simple to judge. Just use your eyes to observe whether the processing channel is full of purple-blue discharges, and you can intuitively understand whether it is a low-temperature plasma (note that you should not use lights of various colors as electric ion discharges) ). If only a few discharge points or lines are scattered on the exhaust gas treatment channel, the effect of the treatment is very limited, because most of the malodorous gas does not enter the low-temperature plasma treatment area.

(2) The low-temperature plasma processing system must have a certain discharge processing power. Usually it needs to be 2 to 5 watt-hours/1000 cubic meters. That is, the electric power that needs to be processed for the air volume of 1000 cubic meters/hour is 2KW~5KW. If the air volume of 1000 cubic meters per hour requires only tens or hundreds of watts of electric power, it is at most electrostatic (dust removal) treatment or partial treatment. It is impossible to deal with bad smells without a certain amount of energy.

Low temperature plasma introduction:

1. The mechanism of low-temperature plasma to remove bad odors

In the plasma chemical reaction process, the energy transfer in the reaction process where the plasma transfers chemical energy is roughly as follows:
(1) Electric field + electron → high energy electron
(2) High-energy electron + molecule (or atom) → (excited atom, excited group, free group) active group
(3) Active group + molecule (atom) → product + heat
(4) Active group + active group → product + heat

It can be seen from the above process that electrons first obtain energy from the electric field, and transfer the energy to molecules or atoms through excitation or ionization. The energy-obtained molecules or atoms are excited, and at the same time, some molecules are ionized to become active groups; Then these active groups collide with molecules or atoms, active groups and active groups to generate stable products and heat. In addition, high-energy electrons can also be captured by substances with strong electron affinity such as halogens and oxygen, and become negative ions. Such negative ions have good chemical activity and play an important role in chemical reactions.


2. The principle of low-temperature plasma to remove bad smells
The principle of low-temperature plasma technology to treat pollutants is: under the action of an external electric field, a large number of energy-carrying electrons generated by dielectric discharge bombard the pollutant molecules to ionize, dissociate and excite, and then trigger a series of complex physics, The chemical reaction transforms complex macromolecular pollutants into simple small molecule safety substances, or transforms toxic and harmful substances into non-toxic, harmless or low-toxic substances, so that the pollutants can be degraded and removed. Because the average energy of the electrons produced after ionization is 10ev, proper control of the reaction conditions can achieve very fast chemical reactions that are difficult to achieve or are very slow under normal circumstances. As a high-tech with strong potential advantages in the field of environmental pollution treatment, plasma has attracted great attention from related disciplines at home and abroad.


3. Application of low temperature plasma technology in environmental engineering
Application of low-temperature plasma technology in waste gas treatment. With the development of industrial economy, the odorous and odorous gases produced by sewage plants, pharmaceuticals, garbage transfer stations, fermentation and other industries are also increasing. These waste gases will not only stay in the atmosphere for a long time. , It will spread and drift to farther places, causing serious pollution to the environment. These exhaust gases are inhaled into the human body and directly cause great harm to human health; in addition, the uncontrolled emission of industrial flue gas makes the global atmospheric environment Deteriorating day by day, the harm of acid rain (mainly from sulfur oxides and nitrogen oxides emitted by industries) has attracted the attention of all countries. The acidification of the atmosphere due to pollution has led to the destruction of the ecological environment. Major disasters frequently occur, causing huge losses to human beings. Therefore, it is imperative to choose an economical and feasible treatment method.

The traditional treatment methods for the degradation of malodorous and peculiar gases, such as absorption, adsorption, condensation and combustion, are difficult to achieve for low-concentration malodorous and peculiar gases. The photocatalytic degradation of malodorous and peculiar gases has the problem of easy catalyst deactivation. Low-temperature plasma treatment is used The offensive odor can be free from the restriction of the above conditions and has potential advantages. But because plasma is an interdisciplinary subject that includes basic disciplines such as discharge physics, discharge chemistry, chemical reaction engineering, and vacuum technology. Therefore, there are very few units that can maturely master this technology. Most of the propaganda about the use of low-temperature plasma technology to treat exhaust gas is not a true low-temperature plasma exhaust gas treatment technology.


Applicable objects and application industries
The low-temperature plasma industrial exhaust gas purification complete equipment developed by KLEAN can effectively purify the following substances:

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

◆ Nitrogen-containing compounds, such as ammonia, amines, nitriles, nitro compounds and nitrogen-containing heterocyclic compounds, etc.; 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-containing 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 of super-saturated odor-containing moisture produced by cooking and fermentation; monosodium glutamate, pharmaceutical, chemical, sludge drying and other industries.

◆ Air purification treatment in a relatively closed and poorly air-permeable space.

◆ It can effectively remove hydrogen sulfide, ammonia, trimethylamine, methyl mercaptan, methyl sulfide, carbon disulfide, styrene, and dimethyl disulfide, which are the eight major malodorous substances specified in the National Odor Pollution Control Standard.

The equipment has a wide range of applications, and can be used in petrochemical, pharmaceutical industries, feed and fertilizer processing plants, animal husbandry products farms, chemical fiber plants, leather factories, pulp mills, sewage pumping stations, various sewage treatment plants, paints, and food additives Pollution problems such as organic waste gas, peculiar smell and foul odor exist in many industries such as factories, leather processing, photosensitive materials, automobile manufacturing, public toilets, and fecal transfer stations. It can be applied to the treatment of industrial waste gas and indoor air purification, etc. It is a new type of air environment cleaning technology and product with a very wide range of uses.

4. Whether it is a simple method of judging whether it is a low-temperature plasma treatment technology

At present, there are many products and technologies promoting low-temperature plasma exhaust gas treatment in various media, but most of the promotion of these products is about the concept of low-temperature plasma. How to judge whether it is a true low-temperature plasma technology? You can use the following two simple rules to judge, even if you don't understand low temperature plasma technology, you can judge whether it is true or not.

(1) The exhaust gas treatment channel must be filled with low-temperature plasma. This rule is very simple to judge. Just use your eyes to observe whether the processing channel is full of purple-blue discharges, and you can intuitively understand whether it is a low-temperature plasma (note that you should not use lights of various colors as electric ion discharges) ). If only a few discharge points or lines are scattered on the exhaust gas treatment channel, the effect of the treatment is very limited, because most of the malodorous gas does not enter the low-temperature plasma treatment area.

(2) The low-temperature plasma processing system must have a certain discharge processing power. Usually it needs to be 2 to 5 watt-hours/1000 cubic meters. That is, the electric power that needs to be processed for the air volume of 1000 cubic meters/hour is 2KW~5KW. If the air volume of 1000 cubic meters per hour requires only tens or hundreds of watts of electric power, it is at most electrostatic (dust removal) treatment or partial treatment. It is impossible to deal with bad smells without a certain amount of energy.

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