5 results about "Microwave plasma torch" patented technology

The present application relates to a biomass pyrolysis gasification device and method using an atmospheric pressure microwave plasma torch, and belongs to the field of energy and environmental engineering. The device comprises a microwave plasma system, a reaction chamber, an airflow conveying system, an airflow control system, a material processing system, an ash storage bin, and a gas treatment system. The present application synchronously realizes biomass feeding, processing, and solid product discharge through its own gravity, effectively reduces heat loss, avoids tar generation, prevents material blockage, and separates the biomass materialization region from the plasma coupling region. The reaction chamber is designed ingeniously, simplifying the integration with other equipment, and has the advantages of low cost and high microwave energy utilization efficiency, significantly improving the integration and overall operation performance of the system.

This utility model relates to a device for preparing nanoscale powder using microwave plasma, comprising a plasma generating mechanism and a reaction vessel. The plasma generating mechanism includes a magnetron, a waveguide structure, and a quartz tube. The magnetron is coupled to the quartz tube through the waveguide structure to generate microwave plasma. A powder receiving container is provided at the bottom of the reaction vessel, and a feeding port is located at the center of its top. The lower end of the quartz tube is partially disposed inside the reaction vessel through the feeding port, or connected to the feeding port. A high-temperature plasma region is formed in the upper part of the cavity of the reaction vessel. A vacuum mechanism is also directly or indirectly connected to the side wall of the reaction vessel, which can adjust the vacuum level inside the reaction vessel cavity, so that the length of the microwave plasma torch blown out from the lower end of the quartz tube is adjustable in the high-temperature plasma region. A spheroidized region is also formed in the lower part of the cavity of the reaction vessel, which can cause the molten powder to solidify when falling.

This invention discloses an online boron concentration detection system and method for nuclear power plants. The system includes: a sample introduction module for pretreating a boron-containing aqueous sample to obtain a sample aerosol, and delivering the sample aerosol to the reaction end; a microwave plasma torch generation module for receiving the sample aerosol delivered by the sample introduction module and forming a high-temperature microwave plasma torch through microwave field coupling, then generating a characteristic spectrum through the high-temperature microwave plasma torch; and a characteristic spectrum identification and concentration detection module for acquiring the characteristic spectrum and performing qualitative identification and quantitative calculation to obtain the corresponding boron element concentration data. This invention, by employing microwave-induced plasma spectroscopy technology, enables accurate online analysis of boron concentration in liquid samples, thereby improving the detection accuracy and efficiency of boron.

The present application relates to the field of microwave plasma technology, and more particularly to a wideband atmospheric microwave plasma torch, which mainly comprises an outer conductor, an inner conductor, an RF joint and a discharge device. The inner conductor comprises a first tapered end, a cylinder and a second tapered end. The cylinder is connected between the first tapered end and the second tapered end. The first tapered end is connected with the RF joint, and the second tapered end is connected with the discharge device. Through the above structure, the second tapered end at the end of the inner conductor (electrode) is enlarged to increase the electric flux and expand the excitation area of the plasma torch, so that the stable excitation of the large-flow and large-volume plasma flame can be realized. The increase of the electrode will cause the impedance mismatching to be unbalanced. Two gradually changing impedance matching structures are added to the design of the torch body to achieve good matching between the electrode end disc and the coaxial structure.

The utility model relates to the field of microwave plasma technology, and concretely relates to microwave plasma torch gas conversion device based on waveguide resonant cavity, and the above structure of the utility model is mainly including waveguide cavity and quartz tube, and the quartz tube is arranged in the waveguide cavity, the section of quartz tube in the waveguide cavity is provided with expansion part, and the cross-sectional area of expansion part is greater than the cross-sectional area of non-expansion part of quartz tube. Through the above structure, in the microwave plasma reactor, the quartz tube is centrally provided with the expanded structure area, namely the expansion part, and after the gas is admitted, annular airflow is formed in the expansion area of expansion part, the time of reaction gas being ionized into plasma is significantly prolonged, namely the reaction time is significantly prolonged, which is favorable for improving the reaction conversion efficiency. Moreover, the expansion area provides good conditions for the placement of catalyst, realizes the effective coupling of plasma and catalyst, and enhances the synergistic catalysis effect.