163 results about "Particulate flow" patented technology

The invention provides a semi-analytic LBM-DEM method for simulating particle-fluid two-phase flow, and the method comprises the steps: constructing a semi-analytic LBM-DEM coupling model, enabling the model to firstly determine the range of an expansion domain of particles, and obtaining the information, such as the average fluid velocity, the vorticity, the pressure gradient and the porosity, near the particles through traversing units in the expansion domain; and then, based on a theoretical formula and a semi-empirical formula, calculating the acting force of the fluid on the particles, and correcting a solid collision operator weight coefficient of a particle covering unit according to the acting force, so that synchronous evolution of particle dynamics and flow field distribution is realized. Compared with a classical analysis LBM-DEM coupling method, the method has the advantages that the calculation cost can be remarkably reduced under the condition that the calculation precision is guaranteed, and the method is particularly suitable for particle two-phase flow simulation in complex flow channels such as porous media and fractures.

Absorbent structures and methods of manufacture are disclosed. In one embodiment, a method of manufacturing may comprise, directing a stream of particles toward a layer, spraying the stream with a first adhesive, the first adhesive contacting the stream at a first contact point, spraying the stream with a second adhesive, the second adhesive contacting the stream at a second contact point, the first contact point being different from the second contact point, depositing the intermixed particles, first adhesive, and second adhesive onto the layer, and covering the mixture of the particles, the first adhesive, and the second adhesive with a second layer.

The invention belongs to the field of geologic disaster prevention and control of geotechnical engineering, and provides a multi-scale numerical simulation method for a slope instability mechanism of a ductile shear zone, which comprises the following steps: acquiring physical and mechanical parameters of a rock-soil body material, and establishing a numerical model based on a particle flow discrete element method; a Johnson-Kendall-Robert contact model is adopted as a contact model between particles, the contact force between the particles is calculated, and meanwhile, a pressure interference parameter is defined to control the limit value of normal contact rigidity; performing dynamic modeling of the discrete element particle system based on a particle generator; static modeling of a discrete element particle system is carried out based on a Lagrange body continuous unit component; the acting force of discrete element particles is converted into equivalent grid node force through an equivalent node force conversion method, and surface attributes of all unit sets possibly involved in contact are defined in a solver.

The invention relates to the technical field of fluidized beds, in particular to a fluidization coating device with pulse, stirring and double-particle triple synergy, which comprises a spray fluidized bed reactor, a fluidized bed reactor, a stirring device and a double-particle fluidized bed reactor, the gas distributor is positioned above the carrier gas inlet and is used for uniformly distributing carrier gas entering from the carrier gas inlet on the whole bed layer to form fluidized gas; the gas-liquid two-phase flow nozzle is connected with the gas supply unit and the coating liquid conveying tank and is used for atomizing the coating liquid into micron-sized small liquid drops and then spraying the micron-sized small liquid drops into the spray fluidized bed reactor; the mechanical shearing unit continuously generates local mechanical crushing on the aggregate; the pulse air inlet device is connected with the air supply unit and is used for applying periodic pulse airflow to the fluidized bed layer and breaking particle aggregation and channeling formed during initial fluidization; and the flow aiding particles and the fine powder particles to be coated jointly form a double-particle fluidization system. The problems of difficult fluidization starting, non-uniform fluidization and the like of ultrafine powder particles are solved through triple synergy of pulse, stirring and double particles.

The invention relates to the field of multiphase numerical simulation, and discloses a cross-scale particle flow calculation method based on feature point arrangement, and the method comprises the steps: obtaining the position coordinates, speed, radius and augmentation coefficient of particles in a current time step, and the position coordinates, volume and speed of all fluid domain grids; determining position coordinates of the feature points according to the grid volume, the particle radius and the augmentation coefficient; dividing grids where the feature points are located into internal grids, boundary grids and external grids on the basis of the position relationship between the feature points and the particles, calculating the voidage of each grid in different modes, and calculating the background voidage of the particles; the background flow field speed of the particles is calculated according to the grid voidage, the volume and the speed; according to the background voidage, the speed and the background flow field speed of the particles, the drag force borne by the particles is calculated, and therefore numerical calculation of the cross-scale particles is achieved.

The utility model relates to the technical field of plastic particle screening, in particular to a screening mechanism of a plastic granulator, which comprises a bottom plate and a screening box, an inclined socket is clamped on one side of the screening box, a small-hole screen plate, a medium-hole screen plate and a large-hole screen plate are respectively clamped on one side of the inclined socket, and two side plates are fixedly connected with one end of the screening box. According to the plastic particle blanking device, the baffle is moved to the position between the small-hole sieve plate and the middle-hole sieve plate, then plastic particles are intercepted by the blocking plate and roll downwards, the blanking speed of the plastic particles is reduced, the time of the plastic particles staying on the small-hole sieve plate is prolonged, and the plastic particles are prevented from falling off from the middle-hole sieve plate. According to the plastic particle screening mechanism, plastic particles can be better screened through the small-hole screening plate, then the plastic particles can be continuously turned over through the two transverse plates on the driven rotating rod, it is ensured that the plastic particles flow and are fully and comprehensively screened, it is avoided that the plastic particles are accumulated at one position all the time, screening work is accelerated, and the production efficiency of the screening mechanism is improved.

The invention relates to a sample holder capable of rotating about an axis of rotation (X) in a test chamber for corrosion and / or erosion tests, the sample holder having a side surface (1) rotationally symmetrical about the axis of rotation (X), the invention relates to a sample holder for a particle-fluid mixture, having a lateral surface on which at least a first support for a first sample and a second support for a second sample are arranged in order to expose the main surface of each sample extending radially with respect to the axis (X) to the apparent flow of the particle-fluid mixture, the sample holder comprising means for attaching the first sample and the second sample, the first and second supports are configured such that when the first and second samples are attached to the first and second supports, respectively, the major surface of each sample is oriented at a respective different angle with respect to a plane perpendicular to the axis (X).

The closure member is configured for use in a valve. These configurations can have a coating or conformal layer that can cover most, if not all, of the underlying material. This layer can include pre-propagated cracks that form through thermal cycling prior to use. These pre-propagated cracks act as stress relief to accommodate thermal stresses that may arise due to different thermal expansion rates between the underlying closure member and the coating. In one implementation, the layer can include a crack profile designed to direct the formation of pre-propagated cracks and to prevent crack initiation to a certain depth in order to maintain at least some integral layer of material above the underlying plug (118). This feature can extend the useful life of the plug, especially in aggressive process fluids, such as particulate-laden fluids common in hydrocracking and refining operations.

The application provides a multi-scale fluid-structure coupling coarse-grained simulation method, which is applied to CFD-DEM numerical calculation of a particle-fluid system. The coarse-grained simulation method not only equivalently regards fine particles in the particle-fluid system as coarse particle agglomerates, reduces the number of calculated particles and improves the calculation efficiency, but also provides quantitative coupling relations among fine particles, coarse particle agglomerates and fluid grids of three scales in order to characterize the non-uniform distribution characteristics of the internal particles of the coarse particle agglomerates and the flow field, and adopts a kernel function to establish mapping relations and momentum exchange models of physical quantities such as mass, velocity and force between the coarse particle agglomerates and the fine particles, and between the coarse particles and the fluid grids. Therefore, the coarse-grained simulation method provided by the application not only improves the calculation efficiency, but also guarantees the numerical calculation accuracy of CFD-DEM in the particle-fluid system.

A pump for use with fluids having particulates has an inlet to allow the fluids into a chamber of the pump. The chamber has a direct flow path of at least one larger width than a side flow path, and has a movable blade and diffuser stack within the chamber. Power features of the pump cause the movable blade to impart a centrifugal force on the fluids within the chamber, while at least one protrusion located circumferentially with respect to the chamber causes the particulates of a direct flow path to gather or causes the particulates to divert from a direction associated with at least one cavity of the chamber.

This invention relates to a coal and rock identification system and method based on spectral detection, comprising a collection chamber and a detection device. The detection device includes a detection chamber, a detection tube, a spectral detection mechanism, and a first suction mechanism. One end of the detection tube is connected to or disconnected from the collection chamber, and the other end extends into the detection chamber. During detection, the collection chamber is first disconnected from the detection tube, and the first suction mechanism suctions the detection chamber to create a pressure difference, resulting in a lower air pressure in the detection chamber than in the collection chamber. After suction, the detection tube is reconnected to the collection chamber, and dust particles in the collection chamber form a particle flow within the detection tube under the pressure difference. The spectral detection mechanism detects the particle flow within the detection tube. This invention utilizes static pressure difference to achieve rapid and stable dust settling to form a particle flow, improving the stability of spectral detection and accelerating the overall detection speed, enabling real-time and accurate identification of coal and rock during coal mining.

The invention provides a method for accurately stopping a thermal energy storage power station, and belongs to the technical field of thermal energy storage power stations. Running acoustic monitoring and particle distribution identification to output a particle fluidization degree classification result and a distribution uniformity evaluation value, establishing a particle distribution sparse matrix, and converting the particle distribution sparse matrix into a dense matrix through a multi-stage progressive clustering algorithm to realize accurate quantification of a particle distribution state; executing precise fluidization termination control to completely convert the energy storage particles from a fluidization state into a fixed bed state, performing fixed bed stability verification to ensure that no local overheating phenomenon exists, completing shutdown state recording, and establishing a shutdown historical database; the technical problems of equipment damage and energy loss caused by non-uniform temperature distribution of energy storage particles in the shutdown process of the heat energy storage power station are solved.

The application relates to the technical field of particle flow simulation, in particular to a CAE simulation method for C-type particle flow state based on a double Euler model, which defines model parameters under a secondary agglomeration theoretical model according to the agglomeration mechanism of C-type particles from initial agglomeration to secondary agglomeration, the model parameters including particle phase diameter, particle phase density, particle phase volume fraction and particle phase shear viscosity, thereby establishing a local dynamic agglomeration particle model (LDAP model) for C-type particles based on an Euler multiphase flow model, and performing C-type particle flow state simulation; the method can realize the setting of numerical simulation conditions and the simulation of the flow behavior of C-type particles through simple flow field calibration and parameter setting, can intuitively reflect the real-time state of the particle agglomerate diameter at any local position in the flow field, has higher accuracy in describing the motion state of particles and gas under the condition of particle agglomerate diameter difference, and can balance the calculation efficiency without increasing the number of particle phases for varying particle diameters.

The harvester includes a cutter drum for cutting up crops harvested from the ground. Inside the harvester, a stream of cut particles is propelled along a discharge path, including a wear plate facing the cutter drum, a concave, an accelerator for further driving the particle stream upward through a tower duct, and a discharge spout. The harvester including a nozzle assembly for discharging water (or an equivalent liquid) in the downstream direction of the discharge path to thereby mitigate plug formation. The nozzle assembly is mounted on the concave, in a position that enables impingement of the discharged liquid on the concave at a location that is upstream of the impact zone of the particle stream, when the header is in a harvesting position and the cutter drum is rotating within a standard operational speed range.

This invention relates to multiphase numerical simulation and discloses a multi-scale particle flow calculation method based on Fibonacci volume partitioning. The steps include: obtaining the particle (velocity, coordinates, particle size, expansion coefficient) and fluid mesh (volume, velocity, coordinates) parameters for the current time step; filtering the particle background mesh and extracting its parameters; generating uniformly distributed discrete points based on particle information and mesh size, and allocating the volume of each point to the corresponding element to calculate the fluid mesh porosity; calculating the particle background porosity and background velocity based on the mesh parameters within the expansion domain; determining the relative velocity and calculating the particle drag force based on the particle velocity, background velocity, background porosity, and particle size; substituting the drag force into the momentum equation to obtain the state parameters of the particle and fluid mesh for the next time step, thus realizing multi-scale particle flow.

The invention relates to the technical field of oil and gas drilling, in particular to a trapping efficiency testing device for an explosion-proof engine. The device is characterized in that a set of testing device is provided for implementation of an explosion-proof engine trapping efficiency test, a testing material bin is of a detachable structure, the bin wall is transparent and visible, a set of testing particle flow sensor is arranged at a discharging port of the testing material bin and matched with a control system to control the gas amount of a gas inlet of the testing material bin, and the set discharging amount of the testing material bin is kept; the trapping net of the trapping box is of a detachable structure, and the requirement for installation of trapping nets of different test particle specifications is met. The device mainly comprises a gas flow controller, a test material cabin, a base, a charging hopper, a stop valve, a test particle flow sensor, a feeding pipeline and a trapping box. The device has the characteristics of safety, reliability, constant test particle flow and convenience in maintenance and cleaning.

The application discloses a coal gangue treatment system and a treatment method. The coal gangue treatment system comprises a crushing assembly, a screening assembly and an air jigging assembly. The crushing assembly is used for crushing coal gangue. One end of the screening assembly is connected with one end of the crushing assembly, so that the crushed coal gangue flows into the screening assembly. The screening assembly is used for screening the crushed coal gangue into coarse particles, fine particles and target particles according to particle size. The other end of the screening assembly is connected with the other end of the crushing assembly, so that the coarse particles screened by the screening assembly flow into the crushing assembly. The air jigging assembly is communicated with the screening assembly, so that the target particles flowing out of the screening assembly flow into the air jigging assembly. The air jigging assembly is used for sorting according to the density of the target particles. The air jigging assembly is communicated with the crushing assembly, so that the light material flowing out of the air jigging assembly flows into the crushing assembly. The coal gangue treatment system has the advantages of high treatment efficiency and low cost.

The invention discloses a numerical simulation-based top coal briquette migration path determination method, which comprises the following steps of: collecting basic information of a fully mechanized caving face, including coal seam and rock stratum thickness, mechanical parameters, particle size and the like; then, building a coal caving test model by using particle flow software PFC and calibrating parameters; marking particles are selected to record the positions of the marking particles in the initial and normal coal caving stages, and a top coal transporting path is obtained; and finally, the excessive coal caving degree of the coal caving support is adjusted based on the path, and a coal caving process optimization scheme capable of improving the top coal recovery rate is provided. The method can accurately determine the top coal transportation path, overcomes the defects of a traditional method, provides support for improving the top coal recovery rate, and facilitates efficient and safe production of a fully mechanized caving face.

The invention relates to a modular assembly type high fill retaining wall, and relates to the technical field of ecological protection, the modular assembly type high fill retaining wall comprises a high fill soil body and a retaining wall body formed by splicing a plurality of precast concrete modules, and the retaining wall body formed by splicing the plurality of precast concrete modules is laid on the left side of the high fill soil body; a three-stage drainage mechanism is integrated on the retaining wall body. According to the modular assembly type high-fill retaining wall, a three-stage drainage mechanism composed of the first-stage earth surface water interception assembly, the second-stage wall back collecting and drainage assembly and the third-stage wall body guiding-out assembly is integrated in the retaining wall body, and a complete hydrological regulation and control path from slope top runoff interception, wall back seepage filtration and collection to directional guiding and drainage in the wall body is constructed. Wherein the seepage regulation and control layer effectively prevents fine particles of a high-filled soil body from losing, the confluence channel and the guide and discharge pipe gallery arranged with the gradient cooperate to achieve efficient one-way water flow discharge, the hydrostatic pressure behind the wall and the height of the infiltration line are remarkably reduced, and the problems that drainage holes of a traditional assembly type retaining wall are prone to being blocked and difficult to maintain are solved.

The invention provides a wear-resistant ceramic overflowing part for a slurry pump, and relates to the technical field of slurry pumps, the overflowing part comprises a volute part, an impeller assembly, a front protective plate and a rear protective plate, the impeller assembly is formed by compounding a ceramic impeller main body and a metal rear cover plate through a flexible buffer connecting layer; a microstructure wear-resistant layer formed by laser is arranged on the overflowing surface of the impeller main body, and the microstructure can change the flowing state of slurry particles, reduce wear and form a self-protection layer; and a wireless passive surface acoustic wave sensor is pre-embedded in the impeller main body, and is used for monitoring stress, temperature and crack signals in real time and transmitting the stress, temperature and crack signals to external equipment. The service life of the overflowing part is greatly prolonged, the reliability of the overflowing part is greatly improved, predictive maintenance is achieved, and sudden failures are avoided by combining ceramic high hardness, microstructure wear resistance enhancement, composite buffering impact resistance and real-time state monitoring.

A particle generator (1) for testing or calibrating particle measuring devices (5) is proposed, which has a reaction chamber (2), a drying chamber (3) downstream of the reaction chamber (2), wherein air is supplied to the reaction chamber (2) via a supply line (11) and the output of the drying chamber (3) can be connected to a particle measuring device (5) via a connecting line (12).In order to provide a particle stream or aerosol for testing or calibrating a particle measuring device (5) in a cost-effective manner, it is proposed that the reaction chamber (2) has a porous layer (21) on which a salt solution (22) is arranged, and that the supply of air into the reaction chamber (21) is made below the porous layer, so that rising bubbles are generated in the salt solution which, when they burst, release salt particles which are dried in the drying chamber (3) before the particles flow to the connecting line (12) in the form of an aerosol.

The invention relates to a device for continuously sorting a particulate stream, comprising: a) a screw conveyor (1) for conveying the particulate stream to a separation device, b) a sieve (7) for separating the particulate stream ac cording to size, characterized in that it further comprises c) a pre-sieve (3) comprising elongated sieve openings formed by fingers extending towards an end portion of the pre-sieve with the tips of the fingers not being connected in that end portion, the pre-sieve (3) being located between the conveyor outlet and the sieve, d) wherein the pre-sieve (3) encloses part of the circumference of the conveyor screw in an axial end portion of the conveyor screw, and e) the radial distance between the conveyor screw (1) and the pre-sieve (3) is less than 10%, preferably less than 5% of the conveyor screw diameter. The pre-sieve allows to separate elongated objects like threads or wires from the particulate stream which would otherwise clog or block subsequent separation devices including the sieve.

The utility model relates to the technical field of piezoelectric valves, in particular to a piezoelectric valve capable of spraying various wide-range fluid containing particles. Comprising a shell, a self-locking plug, a mounting head, a nozzle mechanism, a flow guide mechanism and an auxiliary mechanism, and the auxiliary mechanism comprises a quick-release locking support, a quick-release bolt, a firing pin seat, a lower firing pin, a lower spring, a spring ring, a gasket, an upper spring seat, an upper firing pin, an upper spring, a piezoelectric stack, an upper wedge block, a lower wedge block, a heating device, a nozzle device and a lever device. By arranging the quick-release locking support and the quick-release bolt, only one bolt is needed for disassembly and assembly, quickness and convenience are achieved, the firing pin and the nozzle device achieve extremely high concentricity through the split firing pin structure, glue spraying is more stable, glue point diameter repeatability is higher, zero debugging can be achieved, multiple kinds of fluid with wide-range viscosity and containing particles can be sprayed, and the application range is wide. Therefore, the problems that an existing piezoelectric valve is complex to disassemble and assemble during cleaning, a nozzle is tedious and troublesome to debug, the viscosity range of sprayed glue is narrow, and use is inconvenient can be solved.

The invention relates to a device for continuously sieving a flow of particles, comprising a) a screw conveyor (1) for conveying the flow of particles to a separating device, b) a sieve (7) for separating the flow of particles according to size, characterized in that the device further comprises c) a pre-sieve (3) comprising elongated sieve openings formed by fingers extending towards an end portion of the pre-sieve, wherein the tips of the fingers are not connected in the end portion, the pre-sieve (3) being located between the outlet of the conveyor and the sieve, d) wherein the pre-sieve (3) encloses a part of the circumference of the screw of the conveyor in an axial end portion of the screw of the conveyor, and e) the radial distance between the screw (1) of the conveyor and the pre-sieve (3) is less than 10% of the diameter of the screw of the conveyor, preferably less than 5% of the diameter of the screw of the conveyor. The pre-sieve allows to separate elongated objects such as threads or wires from the flow of particles, which would otherwise clog or block the subsequent separating device comprising the sieve.

The invention discloses a protection device for gas drainage, and relates to the technical field of gas drainage, the protection device comprises a filter box body, the gas outlet end of the filter box body is fixedly connected with a gas outlet pipe, and the gas inlet end of the filter box body is fixedly connected with a gas inlet pipe. The effect that airflow flows to drive particles to flow is utilized, the airflow drives the particles in a coal seam to make contact with the inclined face of the crushing inclined plate, when large particles exist in the gas airflow, the large particles can be crushed through collision, and therefore the situation that when the large particles make contact with a filter screen in the filter box body, the large particles cannot be crushed is avoided. According to the gas filter, the problems that the gas is blocked in the grids and cannot be removed, and large impact force is generated on the filter screen in the prior art are solved, meanwhile, through cooperation of the arc-shaped protruding rods and the collecting grooves, small particles in gas flow can be collected, and the situation that crushed small particle dust or small particle dust in the gas flow directly penetrates through the filter screen is effectively avoided.

The closing components are configured for use on valves. These components may include plugs having grooves or "flutes" extending along their length. Inserts within the flutes may include materials such as ceramics, which are different from the material forming the core or base portion of the plug. These inserts are particularly useful in slowing down erosion of components within the flutes that form outward-facing surfaces exposed to high-speed flow within the valve. This feature can extend the service life of the plug, especially with highly corrosive process fluids, such as fluids containing particles, which are common in hydrocracking and purification operations.

The utility model discloses an air leakage prevention device of a sintering machine, which comprises a trolley air bellow, a main exhaust fan and an air path channel arranged between the trolley air bellow and the main exhaust fan, an arc-shaped choke plate is arranged in the air path channel, and an opening of the arc-shaped choke plate is arranged opposite to working air. And a sintered ore particle circulation passage is arranged on the side of the arc-shaped choke plate. According to the air leakage prevention device of the sintering machine, the arc-shaped choke plate is arranged in the air path channel, so that under the condition that the sintering system before iron is sintered can work normally, the air path channel on the rear end side of the arc-shaped choke plate is abraded and leaks air along the path direction of working air, and the air leakage is prevented. After being sucked into the air path channel under the action of negative pressure, the leaked air rotates and turns round under the guide of the arc-shaped choke plate, the sucked leaked air is blocked by the leaked air which rotates and turns round, wind blocking is achieved, the air leakage amount of the sintering machine is reduced, and high-negative-pressure production of the sintering machine is greatly guaranteed.

The present application relates to the technical field of coal dust concentration measurement, and particularly relates to a coal dust particle flow concentration measurement method and device. The measurement method comprises the following steps: arranging the coal dust particle flow concentration measurement device on a fluid pipeline to be measured; feeding a feed ring antenna on the side of a coaxial cavity with a microwave signal to generate resonance in the coaxial cavity; under the action of an inner wave column and an opening at the lower end of the coaxial cavity, part of the electromagnetic field in the coaxial cavity is scattered into the fluid pipeline of the coal dust particles through the stray cavity; the coal dust fluid produces disturbance to the electromagnetic field and changes the resonance frequency when passing through the electromagnetic field scattered into the fluid pipeline; the disturbed microwave signal is received by another feed ring antenna on the side of the coaxial cavity, and the resonance frequency offset before and after the disturbance is determined through a signal processing circuit; based on a previously fitted relationship between the resonance frequency offset and the coal dust concentration, the coal dust concentration is determined according to the resonance frequency offset, and the measurement accuracy is effectively improved.

The invention relates to a method and a device for determining the degree and / or type of contamination of semi-finished products, as well as a motor vehicle. In the method for determining the degree and / or type of contamination of semi-finished products (10), at least one semi-finished product (10) is provided, and dirt is removed from the surface (11) of the semi-finished product (10), and dirt particles (20) located on or at the surface (11) are removed and fed in a particle stream (60) to an optical detection device (70), by means of which the type, size and / or number of dirt particles (20) per unit of time or unit of area is determined and information regarding the type, size and / or number of dirt particles (20) per unit of time or unit of area of ​​the surface (11) of the semi-finished product is generated.

The invention refers to an apparatus for gluing and mixing particles. Apparatus for gluing and mixing particles with at least a part of an adhesive, especially in the course of producing shaped bodies, wherein the particles are pneumatically suspended and transported as a particle stream (12) in a preferably circular pipe (13) wherein a gluing system (1) is arranged in, along or as part of the pipe (13), wherein said gluing system (1) comprises a tube (5) connected with the pipe (13) to transport the particle stream (12) within its inner diameter, wherein a body (4) is arranged with a holding structure within the tube (5), said body (4) features a front part (8) at least partially with a streamlined contour towards the oncoming particle stream (12) and features at least one nozzle (3) for the delivery of adhesive (11) onto the particles of the particle stream (12), wherein within the body (4) and / or within the holding structure channels (21) are arranged to deliver the adhesive (11) from outside of the tube (5) to said nozzle (3). The invention is characterized in that a segmented body (4) comprises at least two parts arranged along the flow of the particle stream and which are arranged from a main part (23) with a mountable front part (8) and / or an mountable end part (9). The invention refers further to a method for an assembly or an disassembly of the gluing unit 1009.