12 results about "Microwave plasma torch" patented technology

The utility model relates to a compressed waveguide cavity type microwave plasma torch, comprising an input waveguide, the input end of which is provided with a front end interface, and the input end of the input waveguide is connected with a microwave generating device through the front end interface and is used for inputting microwaves; the input end of the tapered waveguide is connected with the output end of the input waveguide, and the tapered waveguide is used for compressing microwaves and generating standing waves at the output end; the first air inlet is connected with the side wall of the input waveguide at a set angle; the second air inlet is connected with the side wall of the tapered waveguide at a set angle; the input end of the reaction waveguide is connected with the output end of the tapered waveguide, the output end of the reaction waveguide is connected with the input end of the connection waveguide, and the output end of the connection waveguide forms a flame ejection port. According to the utility model, the plasma torch can be stably formed in the fixed area in the waveguide cavity in the microwave transmission process without depending on any traditional plasma torch constraint structure.

The invention discloses a microwave plasma torch based on bias voltage regulation and control. The microwave plasma torch structurally comprises a rectangular waveguide, a quartz tube, two electrode devices and a direct-current power supply. The quartz tube vertically penetrates through the center of the wide side of the rectangular waveguide, the two electrode devices are arranged at the upper end and the lower end of the quartz tube respectively and connected with a direct-current power source, and bias voltage is applied to a plasma reaction area in the quartz tube through the electrode devices. And the voltage generates a direct-current electric field along the axial direction of the quartz tube in the plasma reaction area. According to the microwave plasma torch, adjustable bias voltage is introduced to the two ends of the quartz tube of the microwave plasma torch, and a stable axial direct-current electric field is superposed on the basis of a microwave electric field, so that the movement direction, energy and spatial distribution of charged particles (especially electrons and positive ions) in plasma are effectively controlled; finally, the purposes of regulating and controlling the plasma chemical reaction path, optimizing the treatment uniformity and enhancing the specific reaction selectivity are achieved.

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 invention discloses a waveguide type microwave plasma torch based on a multilayer dielectric structure. The waveguide type microwave plasma torch structurally comprises a rectangular waveguide, a quartz tube, a focusing circular ring, two focusing semicircular rings and a fixing piece. The dielectric constant of the dielectric material used by the focusing ring is lower than that of the dielectric material used by the focusing semicircular ring. The quartz tube vertically penetrates through a top plate and a bottom plate of the rectangular waveguide, the quartz tube located in the rectangular waveguide is sleeved with the focusing circular ring, the two focusing semicircular rings are oppositely arranged and surround the outer side of the focusing circular ring to form a multi-layer dielectric structure, and a gap exists between the side edges of the two focusing semicircular rings. The fixing piece is located outside the top or the bottom of the rectangular waveguide and used for fixing the quartz tube, and a bottom port of the quartz tube serves as an air inlet. Through the design of the multilayer dielectric structure, larger-area electric field focusing, higher electric field intensity, better microwave power transmission efficiency and better system robustness are realized, and the device is particularly suitable for plasma excitation of difficult-to-excite gas.

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 invention discloses a device and a method for modifying glass fibers by microwave plasmas, and relates to the technical field of glass fiber modification. The device is composed of a single-mode electrodeless microwave plasma torch and a transmission production workbench, the single-mode electrodeless microwave plasma torch comprises a high-temperature-resistant wave-transparent quartz reaction chamber, a compression waveguide, a nitrogen inlet and the like, and the transmission production workbench is provided with a plurality of microwave plasma torch combination devices and a glass fiber conveying mechanism. According to the method, 10L / min-30L / min nitrogen is adopted as an excitation medium, a 1500W-3000W variable-frequency microwave power supply is matched with a water-cooled magnetron to generate 2.45 GHz microwaves, the microwaves are concentrated through a compression waveguide and then act with the nitrogen to generate plasmas, glass fibers to be treated are modified for 30s-90s, and the glass fibers are repeatedly treated after being turned over. The device realizes normal-pressure operation, has no electrode loss, improves the industrial treatment capacity, and meets the large-scale glass fiber modification requirement.

The application discloses a microwave plasma torch structure capable of generating atmospheric microwave nitrogen plasma, and provides necessary parameter conditions for generating stable microwave nitrogen plasma based on the structure. The structure mainly comprises a three-tube coaxial distributed MPT torch tube, a porous concentric support necessary for ensuring coaxiality of the inner tube and the middle tube, a coupling ring for coupling microwave energy, a thin and straight quartz tube for improving the shielding gas flow rate, and a non-metallic straight tube such as a quartz tube or a ceramic tube for changing the material of the inner tube and the middle tube. The application can excite an atmospheric microwave nitrogen plasma torch, and can change the plasma shape and the discharge position by regulating parameters. The thin and straight quartz tube outside the middle tube improves the heat dissipation efficiency, and greatly reduces the operation cost of the device compared with argon commonly used for exciting plasma.

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.

The invention belongs to the field of plasmas, and particularly relates to a microwave plasma torch generator which comprises a microwave coaxial structure and a plasma torch generating structure, and the plasma torch generating structure is installed at the end of the microwave coaxial structure. The plasma torch generation structure comprises an airflow outlet, the airflow outlet is a penetrating opening, sawteeth are arranged on the inner wall of the airflow outlet, the microwave coaxial structure comprises an inner conductor and an outer conductor, the inner conductor is arranged in the outer conductor, an airflow channel is arranged between the inner conductor and the outer conductor, and the airflow channel is communicated with the airflow outlet. And the airflow channel is communicated with the airflow outlet. The invention provides a microwave plasma torch generator and system, and aims to generate a microwave plasma torch with uniform width.

The invention discloses a wide-range real-time detection system and method for plasma nitrogen oxides, and the method comprises the following steps: firstly, introducing multi-channel distributed gas into an atmospheric pressure microwave plasma torch, collecting a plasma emission spectrum signal at a specific position of the plasma torch, and carrying out isokinetic synchronous sampling; the sampled gas enters a dynamic dilution unit, a real-time control model is established based on the law of conservation of mass, and the gas concentration is adjusted to be within the optimal linear range of the detector; automatically generating calibration gases with a series of concentrations by adopting a dynamic dilution method, fitting a calibration curve based on a least square method, and periodically executing an automatic calibration program by the system; the system collects optical signals and diluted and adjusted gas concentration data in real time, a quantitative relation model of plasma discharge parameters and product concentration is established through time sequence correlation analysis, and real-time diagnosis and optimization of the process state are achieved. The problems of narrow measuring range, low efficiency and poor reliability caused by detector saturation and manual intervention in a traditional method are effectively solved.