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Low-temperature Plasma(LP)

  • Product Overview:

    Low-temperature Plasma is the fourth state of maters, like solid, liquid and gaseous. when the applied voltage reaches the ignition voltage of the gas, the gas breaks down into a mixture of electrons, ions, atoms, and radicals. Although the electron temperature is very high in the discharge process, the temperature of heavy particles is very low. And the whole system shows a relatively lower temperature state. So it is called Low-temperature Plasma.


  • Detailed description

      1.Principles

      Low-temperature Plasma is the fourth state of maters, like solid, liquid and gaseous. when the applied voltage reaches the ignition voltage of the gas, the gas breaks down into a mixture of electrons, ions, atoms, and radicals. Although the electron temperature is very high in the discharge process, the temperature of heavy particles is very low. And the whole system shows a relatively lower temperature state. So it is called Low-temperature Plasma.


      2.Mechanism

      Under the influence of external electric field, a large number of high-energy electrons produced by dielectric barrier discharge bombard the gas molecules to ionize, dissociate and excite them. And then this triggers a series of complex physical and chemical reactions, which transfer complex macromolecular pollutants into safe low-molecule-weight substances. These reactions also transform toxic and harmful substances into non-toxic, harmless or low toxic and harmful substances. Thus pollutants are degraded and removed. Because the average electron energy produced by ionization is 10ev, those chemical reactions which are difficult or slow to carry out can be accelerated through proper control of reaction conditions.


      In the process of plasma chemical reaction, the energy transfer is roughly shown below:

       (1) electric field + electron →energetic electron

       (2) energetic electron + molecule (or atom)→(excited atom, excited group, free radical) activated groups

       (3) activated groups + molecule (atom) products+ heat

       (4)  activated groups + activated groups products+ heat

       

      From the process above, it can be seen that firstly electrons acquire energy from the electric field, and transfer energy to molecules or atoms by excitation or ionization. The molecules or atoms that acquire energy are activated, while some molecules are ionized and become activated groups. After that, these activated groups collide with molecules, atoms or themselves to produce stable products and heat. In addition, high energy electrons can also be captured by electron affinity substances, such as halogens and oxygen, forming negative ions. These negative ions have high reactivity and play an important role in the reactions.

       

      1st Process: direct bombardment of energetic electrons

       

      2nd Process: producing oxygen atoms, ozone, hydroxyl radicals and small molecular fragments

      O2 + 2e → 2O?

      O2 + O? → O3 + e

      H2O + 2e → H? + HO?

       

      H2O + O?+ e → 2HO?

      H? + O2 → HO? + O

      C(a+b)H(m+n)O(x+y) + 2e → CaHmOx ?+ CbHnOy?


      3rd Process: oxidation of molecular fragments

      CaHmOx + HO?→ CO2 + H2O

      CaHmOx + O?→ CO2 + H2O

       

      CaHmOx  + O2→ CO2 + H2O

      CaHmOx  + O3CO2 + H2O


      

     3.Parameters

      

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天津11选5追号
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