2000 results about "Gas mixing" patented technology

The invention discloses dust removal equipment for dust explosion prevention and a dust removal method thereof, and relates to the field of dust removal equipment.The dust removal equipment comprises a dust removal box, a plurality of dust removal cloth bags in the dust removal box and a treatment mechanism for dust explosion prevention, the treatment mechanism is composed of a gas mixing assembly, a scraping assembly and a vibration assembly, and a filter bag top frame is connected with a vibration pipe frame through the vibration assembly; the gas mixing assembly is communicated with the dust removal box through a gas inlet pipe, the gas mixing assembly is used for mixing dusty gas and inert gas and preliminarily removing large-particle dust, and the scraping assembly is arranged below the gas mixing assembly and scrapes the filtered large-particle dust; and the vibration assembly is used for periodically vibrating the dust removal cloth bag after the scraping assembly is detached so as to remove fine dust attached to the inner wall of the dust removal cloth bag. Inert gas is introduced and fully mixed before entering the dust removal box, and primary large-particle dust is filtered, so that the oxygen concentration is reduced, and dust explosion is effectively prevented.

The invention discloses a disilane mixed gas dissolving and mixing system and a control method, and relates to the technical field of gas mixing preparation, the disilane mixed gas dissolving and mixing system comprises seven modules, a storage module realizes accurate pressure control through a honeycomb gas storage tank matrix, and the tank wall adopts a nano composite structure for corrosion prevention; the premixing module forms a chaotic flow field by using a double-helix micro-channel and pulse injection; the reaction module is combined with supercritical and electromagnetic resonance to accelerate the reaction; the monitoring module fuses multispectral detection; the control system is based on deep reinforcement learning, in addition, a gradient condensation-membrane distillation separation module, a bionic safety interlocking module and other modules are further arranged, and all the modules cooperate to achieve efficient mixing and production. According to the device and the method, high-precision preparation of disilane mixed gas, precise pressure-controlled material storage, molecular-level efficient mixed reaction, multispectral precise monitoring, intelligent regulation and control, stability guarantee, high safety interlocking and intelligent maintenance are realized, faults can be reduced, the product quality and the production efficiency are improved, and the cost is reduced.

The invention discloses a gas mixing venturi tube and a bubble water device, and relates to the technical field of life electric appliances, the gas mixing venturi tube comprises a tube body, the tube body is provided with a main body part, and an inlet section, a gas suction section and an outlet section which are connected with the main body part; the main body part is provided with a contraction section, a throat pipe section and an expansion section, the inlet section is connected with the contraction section, and two ends of the expansion section are respectively connected with the throat pipe section and the outlet section; the main body part is further provided with an air cavity, and the air suction section is communicated with the throat pipe section through the air cavity. According to the gas mixing Venturi tube, the preparation efficiency and quality of bubble water can be improved, and the negative pressure stability of the throat tube section is improved.

The invention relates to a photoacoustic gas sensing system based on a T-type differential Helmholtz structure and a measuring method, and the system comprises a laser emission module which is used for emitting laser; the gas mixing module is used for preparing C2H2 gas with different concentrations; the MTRDH photoacoustic module is used for storing C2H2 gas into the cavity on the basis of a Helmholtz structure in an MTRDH photoacoustic cell, after the C2H2 gas absorbs the laser, an inverted photoacoustic signal is generated, and sound pressure is concentrated at the tail end of the resonance tube in combination with a T-shaped photoacoustic cell structure; and the gas detection module is used for extracting a 2f signal related to the gas concentration according to the sound pressure and carrying out concentration detection by utilizing the 2f signal. According to the invention, the gas detection of concentrated sound pressure distribution, improved SNR and reduced NNEA can be realized.

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 utility model discloses a novel tetrahydrothiophene concentration measuring device, which relates to the technical field of tetrahydrothiophene detection and comprises a natural gas pipeline, the rear side of the natural gas pipeline is fixedly connected with an L-shaped pipeline I, and the rear end of an L-shaped pipeline III is fixedly connected with a gas mixing chamber. The rear side of the natural gas pipeline is respectively provided with a gas mixing chamber unit, a compressed air preparation unit, a natural gas decompression preparation unit, a sample gas detection unit, a control unit and a communication unit. Air and natural gas are mixed in equal volume, an aerobic detection environment is created, and the working principle of an electrochemical tetrahydrothiophene detector is matched; according to the electrochemical tetrahydrothiophene concentration detector, the tetrahydrothiophene concentration of the mixed gas is accurately detected, then the tetrahydrothiophene concentration of the natural gas is deduced according to the isovolumetric proportional relation, reliable working conditions are created for the electrochemical tetrahydrothiophene concentration detector, continuous measurement can be achieved, detection data are stable, repeatability is good, and precision is high.

The invention belongs to the technical field of pump testing, and provides a gas-liquid two-phase flow pump closed test device and method, the device mainly comprises a water tank, a water delivery pipeline, a gas-water uniform mixer, a water return pipeline, an oil tank, an oil delivery pipeline, an oil-gas uniform mixer, an oil return pipeline and a gas delivery pipeline; the water tank serves as a water source storage unit, an inlet of the water tank is connected with the water conveying pipeline, and water is led out and conveyed to the testing platform. And the outlet of the water return pipeline is connected with the water tank. And the gas-water uniform mixer is mounted on the water conveying pipeline. The design of two test loops is adopted, the two test loops are used for testing the gas-water mixing working condition and the oil-gas mixing working condition respectively, the performance test of the gas-liquid two-phase flow pump corresponding to the two working conditions in actual production is simulated, the deviation caused by performance conversion only after the clean water test is adopted is avoided, and the pump performance test precision is improved.

The invention discloses a carbonizer and a bubble water device, and relates to the technical field of overflowing carbonation bubble water preparation.The carbonizer comprises a gas mixing box body, a gas inlet pipe, a liquid inlet pipe and a liquid outlet pipe, a containing cavity is formed in the gas mixing box body, and a plurality of partition plates are arranged in the containing cavity at intervals; the partition plates divide the accommodating cavity into an inlet chamber, a throat pipe channel and a turbulent flow channel which are communicated in sequence; the air inlet pipe and the liquid inlet pipe are communicated with the turbulent flow channel inlet chamber; the liquid inlet pipe is connected to the rear end of the turbulent flow channel; the sectional area of the throat pipe channel is smaller than that of the inlet chamber and that of the turbulent flow channel; the turbulent flow channel extends from the side close to the throat pipe channel to the side away from the throat pipe channel, and a plurality of turbulent flow units are arranged in the turbulent flow channel and are arranged at intervals in the extending direction of the turbulent flow channel. The technical scheme provided by the invention is used for improving the carbonization concentration of the sparkling water, so that the taste of the sparkling water is improved.

The invention relates to a combustor and a gas stove. The combustor comprises a furnace end, a gas inlet and a gas outlet, an inner ring gas mixing cavity and a middle ring gas mixing cavity are defined between the inner ring fire cover and the furnace end, and the middle ring gas mixing cavity is arranged on the periphery of the inner ring gas mixing cavity in a surrounding mode; inner ring fire holes are formed in the top surface of the inner ring fire cover; the outer ring fire cover is arranged on the periphery of the inner ring fire cover in a surrounding mode at intervals, and an outer ring gas mixing cavity is defined between the outer ring fire cover and the furnace end; a top cover is arranged in the center of the top face of the inner ring fire cover in a protruding mode and covers the top of the inner ring fire hole. An inner ring fire gap is formed between the outer peripheral edge of the top cover and the top face of the inner ring fire cover, the inner ring fire holes are communicated with the inner ring fire gap, fuel gas in the inner ring gas mixing cavity can be combusted at the inner ring fire gap to form inner ring gap fire, flames of the inner ring gap fire are mutually connected, and the good flame stabilizing effect is achieved. And therefore, the flame stability of the combustor under soft fire combustion or extremely soft fire combustion is improved, and the low-temperature cooking requirement is met.

The invention relates to a coal-electricity coupling hydrogen production system and method in an electric power spot market environment, and the system is used for determining load output data of a coal-fired generator set according to a market price signal and a scheduling instruction through a coal machine power generation module. And the water electrolysis hydrogen production module is used for receiving the load output provided by the coal machine power generation module and supplying power to the alkaline electrolytic bath and the proton exchange membrane electrolytic bath through power conversion equipment to prepare hydrogen. And the hydrogen storage module is used for receiving the hydrogen of the water electrolysis hydrogen production module, purifying the hydrogen and storing the hydrogen in a hydrogen storage tank area. And the gas turbine hydrogen doping module is used for conveying hydrogen to the gas mixing station and the combustion-steam combined cycle unit through a pipeline according to the hydrogen storage amount of the hydrogen storage module and the load requirement of the gas turbine. The energy utilization efficiency of the coal-electricity coupling hydrogen production system is improved, and the problem that the coal-electricity coupling hydrogen production system is low in resource utilization rate and further low in economic benefit when power is supplied beyond the selling negative electricity price in the related technology is solved.

The invention provides an intelligent gas pipe network gas quality monitoring system and method based on the Internet of Things, and relates to the field of gas quality monitoring. The system comprises a government gas supervision management platform, a government gas supervision sensing network platform, a government gas supervision object platform, a gas company sensing network platform, an equipment object platform, a gas user platform and a gas company service platform which are in communication connection. The government gas supervision and management platform is configured to determine a monitoring sampling area based on the first gas data; based on the steady-state value of the monitoring sampling area, the monitoring frequency of the gas monitoring equipment in the monitoring sampling area is determined; determining the terminal gas quality based on the second gas data and the gas input information; determining a fuel gas quality demand based on the terminal user characteristics and the fuel gas adjustment data; and in response to the condition that the terminal gas quality does not meet the gas quality requirement, determining updated mixing parameters. According to the invention, the precise monitoring of the gas quality and the dynamic adjustment of the gas mixing ratio can be realized.

The invention provides a short-distance coal seam group Y-shaped ventilation gas extraction method, which belongs to the technical field of coal mining, and comprises the following steps: firstly, arranging a main drill hole vertical to a coal seam and branch drill holes extending to upstream and downstream at an angle of 45 degrees to form a Y-shaped three-dimensional extraction network; installing a gas concentration monitoring sensor network, and setting monitoring points to collect real-time data; constructing a gas concentration adjusting buffer system and an intelligent mixed gas distribution device, and maintaining the concentration of extracted gas to be 30-45%; establishing a predictive control model based on a long short-term memory neural network, predicting a gas emission rule in advance and dynamically adjusting extraction parameters; a gas concentration grading utilization system is implemented, and gas with different concentrations is guided into the corresponding utilization system; a gas extraction intelligent monitoring platform is deployed to realize remote monitoring and fault early warning; the technical problems that in the coal seam group gas extraction process, the extraction concentration is unstable, and prediction control is difficult are solved.

The determination of the probability of gas hydrate formation using artificial neural network (ANN) and multilayer perceptrons (MLPs) models. ANN generally refers to a network of interconnected neurons (also referred to as “nodes”) that model the neurons in a human brain. An MLP refers to a feed-forward network having a specific arrangement of neurons and includes an input layer, one or more hidden layers, and an output layer. Input data such as temperature, pressure, gas mixture composition, and indicators of gas hydrate formation may be obtained and preprocessed for use in training and testing. The ANN and MLPs may be trained using a training set of the input to output a probability of gas hydrate formation. The trained ANN and MLP models may then be used to determine a gas hydrate formation probability for new data associated with a pipeline transporting a gas mixture.

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 invention discloses a preparation method and a preparation system of a silicon-carbon negative electrode material, and the method comprises the following steps: conveying a porous carbon raw material into a deposition furnace, introducing inert gas to replace air in the deposition furnace, and vacuumizing the deposition furnace; raising the temperature of a deposition furnace to 300-800 DEG C, mixing inert gas with the preheated silicon source gas, and introducing the mixture into the deposition furnace for chemical vapor deposition to obtain a silicon-carbon composite material precursor; raising the temperature of a buffer furnace to 300-800 DEG C, conveying the precursor into the buffer furnace, and carrying out chemical vapor deposition by utilizing residual silicon source gas in the buffer furnace; carrying out gas-solid separation on the material in the buffer furnace, conveying the solid to a cladding furnace, detecting the gas, and detecting the content lt of the silicon source gas; and (2) adding 0.2 mg / L of the silicon-carbon composite material into the coating furnace, introducing coating gas into the coating furnace, and performing carbon deposition coating to obtain the silicon-carbon composite material. The preparation system disclosed by the invention is a continuous preparation system, so that the production efficiency is greatly improved, and the requirements of large-scale production are met.

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 utility model discloses a gas conveying device and process equipment of a semiconductor device. The device comprises a first group of gas paths, the gas inlet end of which is connected with a carrier gas source and a TEOS (tetraethyl orthosilicate) source and is used for transmitting a first group of gas comprising carrier gas and TEOS; the gas inlet end of the second group of gas paths is connected with a supplementary gas source, and a second group of gas including supplementary gas is transmitted; the gas inlet end of the third group of gas paths is connected with the ozone source and transmits a third group of gas containing ozone; the gas inlet ends of the gas mixing parts are respectively connected with the gas outlet ends of the first group of gas paths, the second group of gas paths and the third group of gas paths, so that the first group of gas, the second group of gas and the third group of gas in equal proportion are obtained and mixed, and the mixed gas is averagely distributed to the corresponding treatment stations in the reaction cavity from the gas outlet ends of the gas mixing parts for a deposition process. According to the utility model, the distribution uniformity of a plurality of groups of process gases can be improved, so that the film thickness difference of each treatment station is reduced, the condensation temperature of TEOS (tetraethyl orthosilicate) can be improved, and the film particle pollution is improved.

The invention discloses a gas inlet structure, a gas supply system of a semiconductor process and a processing method. The gas inlet structure is positioned at the upper part in a reaction cavity, and comprises a first gas channel and a second gas channel which are respectively used for introducing first gas and second gas; a gas inlet of the gas mixing cavity is connected with the first gas channel and the second gas channel, so that the first gas and the second gas are subjected to primary gas mixing in the gas mixing cavity to obtain primary mixed gas, and the caliber of a gas outlet of the gas mixing cavity is smaller than that of the gas inlet, so that the primary mixed gas is subjected to secondary gas mixing when being output; the final mixed gas is obtained. According to the gas inlet structure, the mixing point of two kinds of process gas easy to react can be delayed, the situation that the two kinds of process gas are mixed and reacted in advance to generate solid particles in the conveying process is avoided, meanwhile, the gas mixing effect of delayed gas mixing can be improved, and therefore the film forming quality and reliability of equipment are guaranteed.

The invention relates to a blower (1) for a fuel cell assembly (205) for a vehicle (200a), in particular a utility vehicle (200b); wherein the blower (1), in order to recirculate a gas mixture (40) used for the operation of the fuel cell assembly (205), has a drive motor (7, 8, 9) with a motor shaft (7), a rotor (9) coupled to the motor shaft (7), and a stator (8) arranged radially outside the rotor (9); the blower (1) has an annular channel (10) for conducting the gas mixture (40), which annular channel is arranged radially between the rotor (9) and the stator (8) and has an inlet side (41) and an outlet side (42); the blower (1) has a blower impeller (5) coupled to the motor shaft (7), the blower impeller (5) being designed to convey the gas mixture (40) from the inlet side (41) to the outlet side (42) during rotation of the motor shaft (7); the blower (1) has a main housing (2) which at least partially forms the annular channel (10), and the blower (1) has a housing cover (6) with a volute (43); and the blower (1) has a functional component (30) which is arranged at least partially within the annular channel (10) and / or at least partially forms the annular channel (10), the functional component (30) being arranged on the main housing (2) and being designed to guide the gas mixture (40) at least partially through the volute (43) during rotation of the blower impeller (5).

The invention discloses a hydrogen-doped natural gas experiment method based on a fuel gas micro-grid. The method comprises the following steps: providing hydrogen and natural gas; mixing the provided hydrogen and natural gas; compressing the mixed hydrogen and natural gas in a compression area; the compressed hydrogen and the compressed natural gas are respectively conveyed to an urban hydrogen doping experiment area and a terminal user experiment area; pressurizing the hydrogen-doped natural gas in the low-pressure experimental area to the high-pressure experimental area by using a compressor in the urban hydrogen-doped experimental area; the hydrogen-doped natural gas is used by equipment in a terminal user experiment area, and hydrogen is provided by a pure hydrogen pipeline, a hydrogen cylinder group or a hydrogen long pipe trailer; natural gas is provided by a natural gas pipeline, a CNG tank car or an LNG tank car, according to the overall design method of the natural gas hydrogen doping experiment system, the quality of the natural gas hydrogen doping experiment can be systematically improved from multiple aspects of gas source supply, hydrogen doping gas mixing, hydrogen doping flow, hydrogen doping conveying, hydrogen doping pressurization and terminal users, and the natural gas hydrogen doping experiment system has the advantages of being simple in structure, safe, stable and high in functionality.

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 an SOFC (Solid Oxide Fuel Cell) multi-channel snakelike flow field with gradient rib layout, and belongs to the technical field of fuel cells. The SOFC multi-channel snakelike flow field comprises gradient ribs, strip-shaped ribs and a snakelike flow channel, the gradient ribs are arranged on the two sides of a U-shaped structure of the snakelike flow channel, and the strip-shaped ribs are arranged at the bottom of the U-shaped structure of the snakelike flow channel. The multi-channel snakelike flow field is combined with the gradient rib structure, a multi-channel inlet reduces the number of flow channel bending times, reduces the gas accumulation risk, avoids the problems of insufficient gas supply and the like, and the gradient rib layout is beneficial to gas mixing diffusion, mass transfer enhancement, pressure drop reduction and net power density improvement.

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.

A controller configured to control a gas mixing device and / or a port injection valve and a direct fuel injector of an internal combustion engine in order to:in a first operation mode, supply a first gaseous fuel to at least one main combustion chamber of the internal combustion engine via at least one intake valve,in a second operation mode, supply a second gaseous fuel to the at least one main combustion chamber of the internal combustion engine by use of the direct fuel injector,wherein a supply system for providing flushing gas to the direct fuel injector is provided and the controller is configured to activate the direct fuel injector during operation according to the first operation mode, such that the flushing gas is injected into the at least one main combustion chamber.

A fuel-fired burner includes a combustion air inlet for receiving combustion air coupled to a combustion air nozzle at an input to a second chamber within a burner housing spaced apart from a third chamber within the second chamber. The combustion air nozzle directs the combustion air into the third chamber. A fuel inlet coupled to a burner nozzle secured to a burner mounting plate has a recycle port for receiving hot exhaust gas provided to an exhaust gas path. A jet pump located entirely inside the burner housing is configured to receive the hot exhaust gas from the exhaust gas path. The jet pump operates by flowing the combustion air through the combustion air nozzle which suctions in the hot exhaust gas through the recycle port into the exhaust gas path then into a gas mixing zone for mixing the hot exhaust gas and the combustion air.

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.