Applied Research On Destruction Of Volatile Organic Compounds(VOCs) With Plasma

Applied research on destruction of Volatile Organic Compounds (VOCs) by plasma is discussed in the paper. On elementary theory of plasm, the mechanism of VOCs destruction was decided: under the action of activated particles (such as high-energy electrons ,ozone , radicals, etc) produced by discharge reaction , a series of physical and chemical reaction will take place., the result is that harmful VOCs is changed into unharmful substance . The removal pathways are: first, high-energy electrons undergo an inelastic collision with target molecule , and transfers all or part of its kinetic energy to molecule . Inelastic collisions result in a change to the target molecule such as ionization, dissociation or excitation . Secondly , cracked molecules are oxidated into CO2~ CO and H20 by ozone and oxygen plasma. In mechanismic test , to measure the ozone concentration, it can deduce mechanism of VOCs destruction. The result show that high electrostatic field strength and low velocity in empty tube are more suitable to produce ozone. In the higher electrostatic field strength, the ozone concentration produced by the reactor with BaTiO3 packed material is more higher than that without BaTiO3 packed material , when the electrostatic field strength is 10.909kv/cm , the highest concentration of ozone is 4.375mg1L. In the experment of destruction of VOCs, benzene, toluene m-xylene and was studied by plasma, the research result show that the removal efficiency of VOCs (benzene, toluene and m-xylene) increases when the electrostatic field strength raises, and deduces when velocity in empty tube and inlet concentration raises. In the higher electrostatic field strength, the removal efficiency of VOCs with BaTiO3 packed material is more higher than that without BaTiO3 packed material. When there is BaTiO3 packed material in the reactor, the highest removal efficiency of benzene, toluene and m-xylene is 92.6%, 96.8% and 100% respectively. When the condition is same , comparation of the removal efficiency is the m-xylene > toluene> benzene. The last product of destruction are COv~ CO and H20.