DEVICE FOR EXCITING AND MAINTAINING MICROWAVE DISCHARGES IN PLASMA CHEMICAL REACTORS Russian patent published in 2012 - IPC H05H1/46 

FIELD: power industry.

SUBSTANCE: device for exciting long-distance discharges in gas flows includes source of electromagnetic microwave oscillations, which is interconnected with metal waveguide of rectangular section, with two opposite located holes in the centre of wide walls. Inside waveguide there arranged is concentrator of electric field in the form of hollow current-conducting flattened cone with diameters of bases D and d (D>d), which has electric contact to one wide wall of waveguide along the boundary of hole of larger diameter and gap z between the edge of base with lower diameter and opposite wall of waveguide. Dielectric reactor tube with gas flow flowing through it passes across waveguide through concentrator and hole in opposite wide wall. Value of gap z lies in the range of λ/50 to λ/5, where λ - length of wave of used source of microwave oscillations in vacuum.

EFFECT: increasing operating stability of plasmatron on surface plasma wave in plasma chemical processes in wide range of pressures of plasma forming gas from several Pascal (Pa) values to atmospheric value.

5 cl, 2 dwg