1360 results about "Gas mixing" patented technology

An ammonia-rich combustion coupled dual-mode prechamber ammonia-fueled engine control system is provided, including an ammonia-fueled engine and an electronic control unit. The ammonia-fueled engine includes a combustion chamber, a dual-mode jet ignition device, and an ammonia injector. The dual-mode jet ignition device includes a prechamber, an air injector, and a fuel injector. When the engine operates, ammonia fuel is firstly injected into the combustion chamber by the ammonia injector to form a rich ammonia-air mixture with air in the combustion chamber. During a compression stroke of the engine, the rich ammonia-air mixture in the combustion chamber is entered into the prechamber through a jet hole. The air injector performs scavenging in the prechamber until a equivalence ratio of prechamber gas mixture is less than 1.0, and then the fuel injector injects fuel into the prechamber forming target mixture. Finally, the target mixture is ignited by the spark plug.

The utility model relates to the technical field of oil fume suction equipment, and provides a cleaning assembly and a range hood, and the cleaning assembly comprises a liquid storage part, a cleaning liquid container and an output pump. Wherein the liquid storage part is provided with an inlet end, a liquid outlet end and an air outlet end, and is arranged in the range hood; the cleaning liquid container is communicated with the inlet end and is suitable for providing cleaning liquid; the output pump is provided with a liquid inlet, a foam outlet and an air inlet, the liquid inlet is communicated with the liquid outlet end, the air inlet is communicated to the air outlet end, and the foam outlet outputs a liquid-air mixture. According to the cleaning assembly provided by the utility model, the output pump can pump the cleaning liquid in the cleaning liquid container into the liquid storage part so as to supplement the cleaning liquid for the liquid storage part, and meanwhile, the foam outlet of the output pump can also pump the cleaning liquid out of the liquid storage part and output a liquid-gas mixture after the cleaning liquid is mixed with gas, so that the range hood is cleaned; according to the range hood cleaning assembly, when the range hood is cleaned by the cleaning assembly, the range hood can be cleaned without arranging two water pumps, the structure is simpler, and the cost can be saved.

The invention discloses a combustion chamber fuel injection and oil-gas mixing system suitable for a low-temperature environment, and belongs to the field of combustion chambers of gas turbines, the combustion chamber fuel injection and oil-gas mixing system comprises a flame tube, a centrifugal nozzle and a two-stage cyclone which are coaxially arranged, after fuel is atomized through the centrifugal nozzle and enters, the fuel is further atomized through rotational flow of an inner ring of the two-stage cyclone and enters the flame tube, and the fuel is injected into the combustion chamber through the centrifugal nozzle. External high-pressure air is swirled through the outer ring of the two-stage swirler to form swirling air, and internal fuel spray is crushed, atomized and mixed; a venturi tube is arranged at the end, close to the flame tube, of the inner ring of the two-stage cyclone, vortex generators are evenly arranged on the inner wall of the expansion section of the venturi tube in the circumferential direction, and oil mist with the small and even particle size is formed after the atomized mist is acted. Through multi-stage rotational flow, oil mist with fine and uniform granularity is formed, the atomization effect is optimized, and the fuel oil atomization quality and combustion stability in a low-temperature environment are improved.

The present application relates to the gas lift type mechanical device for liquid pumping and discharging, which is especially suitable for oil exploitation, natural gas well liquid discharging and gas pumping, and underground water exploitation in industrial and agricultural production and life. The chamber gas liquid pumping and discharging device is composed of a unique U-shaped valve (10), a gas mixing valve (14) and a chamber (12), and a plurality of open chamber sections are formed on the production pipe, so that the upward fluid is divided into a plurality of gas pushing liquid and liquid pushing gas sections, thereby reducing the flow pressure and facilitating the production. The gas mixing valve (14) has the function of automatically adjusting the density of the fluid, so that the gas injection amount and the liquid pumping amount are always optimal, the gas consumption is only 15-20% of the conventional gas lift method, and the device meets the needs of low energy oil well production or natural gas well liquid discharging and gas pumping. The yield of the production well can be controlled by adjusting the gas injection time or the gas injection amount of the ground equipment. The device has the advantages of simple structure, reliable work, long service life, low energy consumption and wide application range.

The application discloses a shock tube experimental device which can realize switching of a high-pressure ignition experimental system and a single-pulse cracking experimental system; when the shock tube experimental device is used as the high-pressure ignition experimental system, the device comprises a shock tube body which comprises a high-pressure section, an intermediate section and a low-pressure section, and further comprises a two-way section, wherein the two-way section is connected with the intermediate section and the low-pressure section through flanges; a pre-gas distribution system which comprises an oxidant gas cylinder, a diluent gas cylinder and a gas mixing cylinder; a vacuum and pressure supply system which comprises a vacuum pump, a gas extraction pump and a driving gas cylinder, wherein the vacuum pump and the gas extraction pump are used for extracting the shock tube body into a vacuum environment; and the driving gas cylinder is connected with the high-pressure section and the intermediate section through a pipeline; when the shock tube experimental device is used as the single-pulse cracking experimental system, a three-way section and a gas exhaust tank are used to replace the two-way section on the basis of the above structure, wherein the three-way section is connected with the intermediate section, the low-pressure section and the gas exhaust tank through flanges.

Disclosed is semiconductor manufacturing equipment. The semiconductor manufacturing equipment includes: a remote plasma source used configured to generate plasma; a reaction chamber coupled to the remote plasma source, and defining a space in which a wafer is processed; an exhaust pipeline coupled to the reaction chamber through an exhaust port, and configured to discharge by-products generated in the reaction chamber; a first pipeline coupled to the reaction chamber; a second pipeline coupled to the exhaust pipeline through the exhaust port; and an analyzer configured to analyze a first gas mixture received from the reaction chamber through the first pipeline.

The invention relates to the field of gas mixing systems, and discloses a gas mixing system based on high-pressure proportional valve control. The system comprises at least two gas branches, and each gas branch is provided with a high-pressure proportional valve communicated with a gas inlet and a one-way valve located at the downstream of the high-pressure proportional valve. The mixing unit is used for mixing the gas of each gas branch in a high-pressure state; the energy storage unit is communicated with the mixing unit and is used for temporarily storing the mixed high-pressure gas; the detection control unit comprises a gas analyzer communicated with the energy storage unit and a controller electrically connected with the gas analyzer, and the controller adjusts the opening degree of the high-pressure proportional valve in a closed-loop mode according to detection signals of the gas analyzer, so that the target component concentration of the mixed high-pressure gas is maintained within a preset range. The system can directly realize accurate proportioning and dynamic adjustment of multi-component gas on a high-pressure side, reduces lag and energy consumption of a low-pressure mixing scheme, and is suitable for high-pressure laser welding, material testing and other scenes needing quick response and high-precision proportion control.

The invention provides a control method and system for interaction between emergency simulation training and a real respirator, and the method comprises the steps: collecting control parameters of the respirator, and carrying out the preprocessing of the control parameters, and obtaining an equipment parameter vector; calculating a physiological response state based on the device parameter vector; the physiological response state comprises alveolar pressure and oxygenation estimation; based on the physiological response state, performing quantitative judgment on the disease stage of the patient to obtain a current disease stage, and executing a corresponding evolution instruction set; a medical specification operation reference table is constructed, a target interval is extracted from the current illness state stage and the evolution instruction set, the matching degree of the target interval and a reference interval is calculated, and the reference interval is extracted from the medical specification operation reference table; determining whether to continue evolution, enter relieving or mark training is completed based on the matching degree; the breathing gas of the patient is simulated and restored through the gas compressor and the gas mixing device and is conveyed to the real breathing machine.

The invention discloses a gas mixing and uniformizing device for hydrogen fluoride gas phase etching, which comprises a device body, the device body internally comprises a first-stage mixing cavity, a second-stage mixing cavity, a third-stage mixing cavity and a reaction cavity which are sequentially communicated, the first-stage mixing cavity is arranged at the top of the device, and three groups of gas inlet pipelines are respectively arranged outside the device and are communicated with the first-stage mixing cavity; a plurality of groups of spiral blades which are arranged in an annular array are arranged in the second-stage mixing cavity, an annular hole partition plate is arranged at the communication part of the third-stage mixing cavity and the second-stage mixing cavity, a porous partition plate is arranged between the third-stage mixing cavity and the reaction cavity, and flow guide holes which are communicated up and down are formed in the annular hole partition plate and the porous partition plate; a manual sample inlet and a manipulator sample inlet are respectively arranged in front of and behind the reaction cavity, and an exhaust port is arranged at the bottom of the reaction cavity. The method has the advantages that the efficient mixing and uniform distribution of the ethanol steam, the hydrogen fluoride gas and the carrier gas can be realized, and the stability and the etching quality of the etching process are improved.

The invention provides a mixed flow velocity and flow measuring device and method, and particularly relates to the technical field of measuring instruments, and the device comprises a gas mixing assembly, a flow field optimization assembly, a flow velocity sensing assembly and a signal processing assembly. The gas mixing assembly comprises a differential channel mixer and a mixing cavity, and gas premixing is achieved. The flow field optimization assembly comprises a plurality of air duct partition plates and straight pipe sections, and the mixed gas conveying pipeline is divided into a plurality of independent divided air ducts; the flow velocity sensing assembly comprises a rectification assembly and a pressure sensing assembly, the rectification assembly comprises a pore plate and / or a grid, and the pressure sensing assembly comprises a plurality of uniformly distributed pressure sensing elements; the signal processing assembly comprises a differential pressure sensing transmitter, a static pressure sensing transmitter, a temperature sensing transmitter, an atmospheric pressure sensing transmitter and a data processing module. The pressure sensing element detects differential pressure signals, the differential pressure sensing transmitter converts the signals, the data processing module calculates the average flow velocity and flow of the mixed gas based on the signals and measurement data, and the measurement precision and accuracy are improved.

A method of in situ ultrasonic flow meter validation includes receiving data characterizing first signal diagnostics and data characterizing a first speed of a first acoustic signal through a gas mixture along a first path in a pipe. The first speed of the first acoustic signal is detected by a first channel of an ultrasonic flow meter including a first pair of transducers that are separated by a first path length of the first path. The gas mixture is configured to flow along a flow path in the pipe. The method also includes determining a status associated with the ultrasonic flow meter based on the data characterizing the first signal diagnostics and / or a difference between the first speed of the first acoustic signal and an independently calculated speed of sound. The speed of sound is calculated based on one or more properties of the gas mixture.

The invention discloses a combined air inlet two-stage combustion six-stroke engine, and relates to the field of power energy. In order to overcome the defects that in the prior art, a six-stroke engine is insufficient in gas inlet in the secondary combustion stage, poor in oil-gas mixing quality and low in combustion efficiency, according to the technical scheme, the six-stroke engine comprises a combustion chamber assembly, a fuel injector, a transmission mechanism and a gas distribution mechanism; the gas distribution mechanism comprises a gas inlet pipeline, an exhaust pipeline, a gas storage cavity, a gas inlet pipeline valve, a scavenging duct and a scavenging duct one-way valve, the working cycle of the engine comprises two times of gas inlet and two times of oil injection combustion acting, and the gas storage cavity releases gas to supplement fresh air in the combustion chamber in the second time of gas inlet. The combustion chamber assembly comprises a cylinder, a piston and a cylinder cover, the piston reciprocates in the cylinder, and the cylinder and the cylinder cover are closed to form a combustion chamber. The invention is suitable for improving the heat efficiency and output performance of the engine, especially for an internal combustion engine power system requiring multiple combustion work.

The invention provides a pneumatic matching design method for an integrated turbine. The pneumatic matching design method comprises the steps that firstly, working boundary parameters of a high-pressure turbine and a low-pressure turbine are determined; 2, turbine one-dimensional matching design considering fuel gas and cold air mixing is carried out; thirdly, turbine meridian flow channel optimization design combining a straight line segment and a Bezier curve is carried out; fourthly, aerodynamic modeling design of the turbine blade based on the equal-relative-blade-height rotation face is carried out; 5, performing quasi-three-dimensional pneumatic matching analysis on the turbine part; step 6, carrying out full three-dimensional pneumatic matching analysis on the turbine part; and seventhly, the pneumatic shape of the turbine blade is scaled, and the influence of production and manufacturing on pneumatic matching is eliminated. The aerodynamic performance of the turbine part designed through the aerodynamic matching design method for the integrated turbine of the aero-engine is good.

The utility model provides an exhaust purification device, an exhaust system and a vehicle. The exhaust purification device comprises a shell, the shell is provided with a gas inlet end and a gas outlet end, a gas mixing cavity and a gas processing cavity which are communicated with each other are formed in the shell, and the gas mixing cavity is located between the gas processing cavity and the gas inlet end; the purification assembly is arranged in the gas treatment cavity; the baffle is arranged in the gas mixing cavity, a first vent hole and a second vent hole are formed in the baffle, and the area of the first vent hole is larger than that of the second vent hole; the baffle is configured to enable a first part of airflow entering the shell to directly flow through the first vent hole and block a second part of airflow entering the shell, so that the second part of airflow flows through the second vent hole after the flow speed of the second part of airflow is reduced. The baffle can improve the flow velocity uniformity of the exhaust gas, so that the exhaust purification device does not need to be provided with a gas inlet end cone, the space required by the exhaust purification device can be reduced, and the problem that the exhaust purification device is difficult to arrange can be solved.

The invention relates to a photocatalytic wastewater treatment device which is characterized in that the photocatalytic wastewater treatment device comprises a multi-section cross flow mixing pipeline, an ultrasonic tank and a photocatalytic reactor, and the photocatalytic reactor is composed of a tubular reactor provided with an ultraviolet lamp and a baffle embedded in the tubular reactor; wherein the cross-flow mixing pipelines are distributed in a tree shape, each cross-flow mixing pipeline comprises a water inlet main pipeline, a branch pipe and a water outlet main pipeline, wastewater enters from the water inlet main pipeline and enters the branch pipes through multi-stage shunting, and materials in the branch pipes enter the water outlet main pipelines through multi-stage cross convergence and enter the adjacent cross-flow mixing pipelines. The thought of combining the micro-channel reactor and the Tesla valve is adopted, a liquid-liquid or gas-liquid mixture is subjected to multi-stage shunting and then converged, materials can be effectively promoted to be uniformly mixed, and the design can meet various mixing requirements of liquid-liquid mixing, liquid-gas mixing and liquid-liquid-gas mixing.

The invention discloses a combustion suppression device for a battery module, which is mounted at a pressure relief opening of the battery module and forms a flow channel communicated with the pressure relief opening. The flow channel comprises a gas adjusting cavity and a fire extinguishing cavity which are communicated, and the gas adjusting cavity is arranged close to the pressure relief opening; at least one gas adjusting part is arranged in the flow channel, and the gas adjusting cavity is matched with the gas adjusting part so as to adjust the pressure and / or temperature of the high-temperature and high-pressure gas discharged from the pressure relief opening; a detachable container is arranged in the fire extinguishing cavity, the container is arranged in a breathable mode, the container is filled with a solid granular fire extinguishing agent, the fire extinguishing agent can be broken or decomposed under the action of adjusted gas and release fire suppression gas, and the fire suppression gas and the adjusted gas are discharged after being mixed so as to suppress combustion of discharged gas. According to the scheme, the fire suppression gas with effective concentration can be quickly released and maintained in the early stage of thermal runaway of the battery module, the reburning risk is remarkably reduced, the container is replaceable, and the maintenance cost is reduced.

The invention belongs to the technical field of aircraft hydraulic systems, and relates to a long-life and high-reliability sealing structure of an aircraft undercarriage, which realizes oil-gas mixed sealing of an aircraft undercarriage buffer under multiple working conditions through the structural design of fluorinated silicone rubber, nitrile rubber and modified polytetrafluoroethylene materials. Modified polytetrafluoroethylene and nitrile rubber are used on a dynamic sealing surface for combined action, and meanwhile, the wear resistance of the modified polytetrafluoroethylene and the high elasticity of the nitrile rubber are fully utilized, so that the service life of the sealing device under a high-pressure and high-speed dynamic sealing working condition and zero leakage of air seal under a low-temperature and low-pressure static sealing working condition are ensured. The elastic body on the movable sealing surface adopts a T-shaped structure, so that the elastic body torsion failure possibly caused by the undercarriage buffer under a long-stroke working condition and the extrusion failure under high pressure are prevented; and the elastomer for the static sealing surface is made of fluorosilicone rubber, so that the low-temperature performance of the sealing device is ensured. The sealing device can achieve a good sealing effect under the working conditions of oil-gas mixing, long stroke, high pressure, wide temperature range and the like confronted by the sealing of the undercarriage buffer of the aircraft.

A method for forming a film, including: atomizing a raw material solution into a mist to form raw material mist; mixing raw material mist and a carrier gas to form gas mixture; placing a substrate on a placement section of susceptor; supplying gas mixture from an atomizer to the substrate to perform film formation by thermal reaction on substrate; and discharging gas mixture after the film formation through an exhaust unit, wherein in the step of supplying the gas mixture from atomizer to substrate to perform film formation by thermal reaction on the substrate, at least a part of gas mixture is supplied from a smooth section adjacent to placement section to a surface of substrate, the smooth section having a surface roughness of 200 μm or less. A method for forming a film capable of uniformly and stably producing a high-quality film on a surface of a large-diameter substrate.

The invention discloses a landfill methane long-term monitoring static box device and method, and relates to the technical field of landfill methane emission monitoring. The device comprises a box body with an opening in the bottom, a gas conveying unit, a gas mixing unit, a one-way low-pressure relief valve, a detection module, a power supply unit and a control system. The method comprises a deployment stage, an initialization stage and a monitoring stage, and the methane emission rate can be calculated by automatically injecting air, mixing gas and collecting and transmitting data. According to the device and the method, automatic and long-term continuous monitoring is realized, multi-dimensional parameters are synchronously acquired, the monitoring efficiency and the data continuity are improved, the problems that a traditional static box depends on manpower, the data dimension is single and the like are solved, and data support is provided for an emission reduction strategy.

The invention belongs to the technical field of oil exploitation, and particularly relates to a nano bubble generator, a nano bubble preparation method and a method for improving recovery efficiency by using nano bubbles, the nano bubble generator comprises a bubble generator main body, a containing cup and at least one bubble water filter plate, the mesh apertures of the adjacent bubble water filter plates are different, and the containing cup is arranged in the containing cup. The mesh diameter of the bubble water filter plate close to the water inlet end is larger than that of the bubble water filter plate close to the water outlet end. According to the bubble water filter plate disclosed by the invention, nano bubble water is converted into the nano bubble water through an extrusion shearing effect and is extruded out of the meshes, large bubble water can be converted into the nano bubble water, and the gas mixing uniformity is good; by using the nano-bubble method, the injection pressure during water flooding is effectively improved, the swept volume is enlarged, the flowing direction of oil and water is microscopically regulated and controlled, the oil washing efficiency is improved, and residual oil which is difficult to extract by conventional water flooding is effectively displaced.

The invention discloses a special gas holder safety control method and system based on multi-parameter monitoring, and the method comprises the steps: collecting the gas concentration, environmental parameters, equipment state and other multi-dimensional data inside and outside a special gas holder through a distributed sensor network, carrying out the adaptive filtering and time sequence feature extraction, and constructing a dynamic risk portrait in combination with a process situation. An LSTM-VAE hybrid model, a gas reaction knowledge graph, an improved D-S evidence theory and a pipeline topology propagation model are utilized to calculate an abnormal score, a gas interaction risk score and a space risk score respectively, a comprehensive risk value is generated through dynamic weighted fusion, risk grades are divided, and a hierarchical control strategy is triggered. When the risk is abnormal, leakage source positioning and gas mixing traceability are automatically started, and a diagnosis report is generated. The system realizes closed-loop management of monitoring, early warning, response and traceability, integrates a data driving method and a knowledge driving method, and improves the risk identification accuracy and the disposal intelligent level.

The utility model discloses vapor phase growth equipment. The vapor phase growth equipment comprises a process chamber; the barrel is arranged in the process chamber; the pipe body is arranged on the bottom surface of the barrel and is communicated with the interior of the barrel; the first air channel extends in the side wall of the pipe body, the bottom wall of the barrel body and the side wall of the barrel body in sequence; the base is provided with a recess, and the recess is used for placing a substrate; a second air channel is formed in the base, one end of the second air channel communicates with the first air channel, and the other end of the second air channel communicates with the recess. The rotary sealing mechanism is connected with the bottom of the tube body so as to drive the base to rotate, and the rotary sealing mechanism is provided with a driving gas inlet device which is communicated with the first gas channel so as to provide driving gas which enables the substrate in the concave hole to rotate; the rotating stability of the base, the mixing uniformity of reaction gas above the substrate and the temperature uniformity of the substrate are facilitated, the influence of corrosive reaction gas on the heater can be reduced or avoided, and the obvious heat influence of the heater on the rotating driving device can be reduced or avoided.

The invention relates to the technical field of aero-engine combustion chamber design, in particular to a multi-layer mixing section structure of a pulse detonation combustion chamber. The multi-layer mixing structure is characterized in that the multi-layer mixing structure comprises a multi-layer mixing section arranged in a detonation pipe, an oil supply pipe is arranged on the detonation pipe, the multi-layer mixing section comprises an inner mixing ring and an outer mixing ring, and the inner mixing ring and the outer mixing ring form three Venturi type circulation channels through connecting structures; and a fuel nozzle connected with an oil supply pipe is arranged at the axis of the inner mixing ring. By means of the multi-layer mixing section, incoming flow air is divided into multiple jet flows, the mixing efficiency of fuel oil and air is improved, the mixing uniformity of the fuel oil and air is remarkably improved, and the mixing distance is shortened. Meanwhile, according to the regenerative cooling structure, a fuel oil channel is designed in a multi-layer mixing section, recycling of the wall face of the pulse detonation combustion chamber is achieved, meanwhile, the oil injection temperature is increased, the fuel oil and air mixing effect is improved, and the combustion efficiency is improved.

The application discloses a CVD / CVI digital model and prediction method, which comprises a first H2 barrel, an Ar barrel, a second H2 barrel, a chemical vapor deposition reactor, a gas mixer and an electronic balance with a heating function; the output port of the first H2 barrel, the output port of the Ar barrel and the electronic balance with the heating function are all connected with the gas mixer; the output port of the second H2 barrel is connected with the gas mixer; and the gas mixer is connected with the gas inlet of the chemical vapor deposition reactor; the application realizes fast and accurate prediction of the deposition rate of SiC in a wide CVD / CVI process parameter range, and lays a theoretical and method foundation for future CVD / CVI digital twinning and intelligent manufacturing.

The utility model relates to the technical field of spray guns, in particular to an automatic gas mixing spray gun diffuser, which not only can mix and stir gas flow and powder to uniformly mix the gas flow and the powder and ensure the subsequent spraying effect, but also can freely adjust the flow of the gas flow as required to improve the use flexibility of the device. Spray guns are included; the device further comprises a material conveying mechanism, an air conveying mechanism, a diffusion mechanism and a mixing mechanism, the material conveying mechanism is installed on the spray gun and conveys powder, the air conveying mechanism is installed on the spray gun and conveys air, the diffusion mechanism is installed on the spray gun and facilitates powder diffusion, and the mixing mechanism is installed on the diffusion mechanism and stirs and mixes airflow and powder.

In an air-gas mixer (220) for mixing an air stream (111) with a gas stream (119) to produce a combustible air-gas mixture (130), wherein the air-gas mixer (220) has a tubular mixer body (224) extending along a longitudinal axis (222) from an inlet end (226) for the air stream (111) to flow into the tubular mixer body (224) to an outlet end (228) for the combustible air-gas mixture (130) to flow out of the tubular mixer body (224), and wherein a gas inlet opening (319) is provided for admitting the gas stream (119), a thermally deformable adjusting element (350) is provided to control the flow rate of the gas stream (119) through the gas inlet opening (319) into the to adjust the tubular mixer body (224) depending on the thermal expansion of the thermally deformable adjusting element (350).

The object of the present invention is a control method for verifying the presence of the flame in the combustion chamber (41) of a premixed gas burner (1), fed by an air and gas mixture mainly and / or essentially comprising hydrogen H2. The method is based on the use of at least one temperature sensor (6), the values whereof are sent to a control device (8) which uses them to calculate the derivative T′ over time of the temperature T to compare it to suitable feedback thresholds (Tau1, Tau2; Tau3, Tau4) to establish the ignition occurred, the ignition failure or flame extinguishment.

The invention belongs to the technical field of gas mixers, and particularly discloses an efficient and stable gas mixing device. The upper portion of a shell of the device slidably penetrates through an upper fixing frame, the lower portion of the shell is fixed, the shell is sequentially divided into a preheating area, a mixing area and a reaction area, and at least two gas inlet pipelines are arranged on the shell; the mixer is arranged in the mixing area, the upper and lower ends of the internal pipe are hermetically connected with the inner wall of the mixing area respectively, and a plurality of gas distribution plates for guiding gas flow distribution are sequentially arranged at two ends and inside the internal pipe; the thermocouple guide pipe sequentially penetrates through the upper fixing frame, the preheating area and the mixer. The gas inlet pipeline sequentially penetrates through the upper fixing frame and the preheating area and extends into the mixer, and the end, outside the shell, of the gas inlet pipeline is connected with a gas supply source through a gas flow meter; one end of the mixed gas outlet pipeline penetrates through the lower fixing frame and extends into the reaction area, and the other end is connected with an analytical instrument. The device has the characteristics of compact structure, high mixing efficiency, small concentration difference, few side reactions, good stability and strong adaptability.

The application discloses a stove burner, which comprises a combustion tube and a base, a plurality of fire holes are arranged on the combustion tube at intervals, the combustion tube comprises a first fire tube and a second fire tube, the first fire tube is in a first spiral structure gradually increasing from the middle part to the outer side in the horizontal plane, the second fire tube is in a second spiral structure gradually increasing from the middle part to the outer side in the horizontal plane, the first spiral structure is embedded in the second spiral structure, the head end of the first fire tube is communicated with the tail end of the second fire tube, and the tail end of the first fire tube and the head end of the second fire tube are both communicated with a gas mixing chamber in the base. The stove burner comprises the combustion tube and the base, is simple in structure and low in cost, the first fire tube forms the first spiral structure, the second fire tube forms the second spiral structure, the first spiral structure is embedded in the second spiral structure, the two spiral structures are connected at the head and tail to form a burner with multiple rings and adjacent rings being connected with each other, more fire holes are arranged between the adjacent rings, the flame heating is more uniform, and the cooking experience is better.

The utility model relates to the technical field of combustion equipment, and provides a low-nitrogen combustion device for flue gas recirculation, which comprises a circulation frame, a gas delivery pump and a secondary gas mixing mechanism, the circulation frame is provided with a venturi mixing tube group, the venturi mixing tube group is communicated with a uniform gas delivery mechanism for flue gas delivery, the gas delivery pump is mounted on the circulation frame, and the secondary gas mixing mechanism is mounted on the circulation frame. The gas outlet end of the gas conveying pump is communicated with one end of the Venturi mixing tube set through a gas conveying bent tube, and the secondary gas mixing mechanism is installed on the circulation frame, arranged in the Venturi mixing tube set in a penetrating mode and used for conducting secondary acceleration and mixing on gas in the Venturi mixing tube set. The low-nitrogen combustion device for flue gas recirculation solves the problem that in the prior art, when a low-nitrogen combustion device for flue gas recirculation circulates flue gas, the mixing efficiency of the flue gas and air is poor.