Portable normal-pressure microwave plasma torch generation device and method

Abstract

The invention discloses a portable normal-pressure microwave plasma torch generation device and method. The portable normal-pressure microwave plasma torch generation device comprises a portable microwave torch plasma emission head, a high-power coaxial transmission line and an all-solid-state microwave power source, wherein the portable microwave torch plasma emission head comprises a ceramic ring, a solid electrode, a metal nozzle, an insulation ring, an adaptor, a first air inlet pipe and a second air inlet pipe. Through implementing the method and the device, provided by the invention, microwave plasma capable of providing long-distance portable operation can be generated, the device does not need high-voltage direct current of several kilovolts, a transmission line component such as three pins or a short-circuit piston in a microwave torch system is not needed to be operated by manual, the impedance of a microwave transmission line is automatically matched and adjusted, and the optimal efficiency of microwave coupling entering plasma is achieved.

Description

technical field [0001] The invention belongs to the field of low-temperature plasma physics and applied scientific research, and in particular relates to a portable atmospheric pressure microwave plasma torch generating device and method. Background technique [0002] Microwave plasma belongs to an important category of low-temperature plasma sources, because it does not require electrodes, has a high plasma density threshold, high electron temperature, low plasma space potential, wide working pressure range, and many types of active free radicals. High, wide temperature range of generated gas, which can be non-equilibrium plasma or thermal plasma in local thermal equilibrium state, so it is widely used in material surface cleaning, waste gas treatment, material preparation, greenhouse gas conversion, hydrogen production, waste gas liquid or Treatment of solid materials, preparation of nitrogen-containing substances, medical cosmetology, sterilization, preparation of activat...

AI Technical Summary

Problems solved by technology

[0003] However, the traditional microwave torch has the following disadvantages: (1) Safety; the conventional microwave torch magnetron needs to use thousands of volts of high-voltage excitation to generate electrons and then form electromagnetic waves, and it needs to provide several thousand volts of high-voltage direct current power supply

(2) The structure is relatively complicated; traditional microwave torches need to use three-pin or short-circuit pistons, which increases the complexity and weight of the entire system

(3) The operation is inconvenient; it is usually necessary to adjust the three-pin or short-circuit piston in the microwave torch system in order to adjust the coupling of electromagnetic wave energy to the working medium and make microwave energy coupling more efficient

(4) The time-varying adjustment performance is poor; in the traditional microwave torch system, when the external conditions change slightly, the impedance of the entire microwave transmission line needs to be adjusted to optimize the microwave coupling efficiency

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