260 results about "Particulate flow" patented technology

The invention relates to the technical field of wharf loading and unloading, and discloses a bulk grain wharf ship loading and unloading dual-purpose machine which comprises a conveyor main body and a frame, a discharging hopper is fixedly connected to the top of the conveyor main body, the bottom of the conveyor main body is rotationally connected with the outer wall of the frame, and a supporting frame is rotationally connected to the bottom of the conveyor main body; when a ship needs to be unloaded, a conveying pipeline enters a cabin through a moving assembly, then when a first motor is started to enable a rotating rod to rotate, a connecting rod can be driven to rotate, a concave-convex ring rotates, an extrusion pushing assembly ascends and extrudes gas, and finally high-pressure gas is sprayed out towards grain particles and permeates into gaps of the grain particles to form an air cushion effect; the friction force among grain particles is reduced, the mobility of the grain particles is enhanced, the grains are conveniently conveyed by the spiral auger, the situation that the grains are accumulated at the bottom of the spiral auger due to poor mobility of the grain particles, the grains are extruded and are prone to being damaged is effectively prevented, and the integrity of the grain particles is ensured.

The invention relates to a deep stratum well hole and cave mining system and method, the system comprises a traffic well hole system, the traffic well hole system is provided with at least one well hole smaller than 1 m, an internal channel formed by the well hole is communicated with a cave formed by excavation, and the internal channel formed by the well hole is configured to be a flow-back channel and / or an injection channel; the well hole and cave mining device is provided with a crushing assembly and / or a cleaning and transporting assembly, the crushing assembly is used for carrying out form-controllable mining on the ore on the cave rock wall surface, and the cleaning and transporting assembly is used for cleaning ore particles in the cave or transporting the ore particles to the flowback channel; and the particle flow lifting system is used for lifting the extracted ore particles out of the well through the flow-back channel. The technical problems that when caves of deep stratums are mined, the supporting effect is poor, and the ore particle clearing and transporting efficiency is low are solved, and large-scale and high-efficiency mining operation can be conducted on the deep stratums or non-hard stratums.

The invention relates to the field of multiphase numerical simulation, and discloses a large-scale particle flow numerical calculation method based on multi-ball filling, and the method comprises the steps: obtaining a fluid domain grid size, a fluid density and a large particle radius; calculating the radius of the small filling ball according to the size of the fluid domain grid; based on golden angle spiral distribution and minimum distance coverage judgment, determining the number and the positions of small filling balls, and generating a large particle model of multi-ball filling; obtaining the background flow field speed of the large particles and the filling small balls in the current time step, and calculating the background flow field speed and drag force of the large particles; updating through iterative calculation to obtain the speed and the position of the large particles and the small filling balls in the next time step; and adding drag force as a source item into a momentum equation to solve fluid motion, and obtaining a fluid computational domain grid speed in the next time step. Accurate numerical simulation of large-scale particles is realized.

A flush system includes a particle inlet conduit configured for receiving a flow of particles. An outlet conduit is disposed downstream of the particle inlet conduit and configured for receiving the flow of particles from the particle inlet conduit. A fluid inlet plenum is disposed around the outlet conduit and configured for directing a plurality of fluid flows into the outlet conduit.

A method for foam forming an absorbent body includes metering a flow of particles in a sealed system, flowing a plurality of fluid flows into a conduit such that the plurality of fluid flows coats a surface of the conduit with liquid from the plurality of fluid flows, flowing the particles through the conduit towards an eductor, and entraining the particles into a flow of foam at the eductor.

The invention belongs to the technical field of part processing, and provides a multi-harmonic excitation conformal polishing and grinding device and method for ring parts, the device adopts a double-mass double-excitation four-machine reverse split driving mechanical vibration system, high-frequency large-amplitude compound vibration of a conformal container is realized, and the polishing and grinding efficiency is improved. Therefore, the particle medium is driven to perform efficient longitudinal spiral motion around the ring part; the rotary motion of the ring part cooperates with the geometric constraint of the conformal container, so that the relative motion between the particle medium and the ring part is improved, an alternating stress flow field is formed in the ring part, and the problem that the inner surface machining efficiency and the outer surface machining efficiency are inconsistent due to the splitting effect of the ring part on the particle flow field is successfully solved. By means of the method, the problems of low machining efficiency, uneven machining and poor surface quality existing in a traditional finishing machining method for the ring parts with the cartridge receiver and the flame tube as typical parts can be solved, and the machining cost is reduced while the machining precision and the surface quality of the ring parts are improved.

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.

The invention discloses a lubricating equipment component fault prediction test system, which relates to the technical field of lubricating equipment state monitoring and comprises a multi-source sensing module, a particle feature resolving module, an entropy analysis module, a collaborative diagnosis module and a decision execution module. According to the lubricating equipment part fault prediction test system, by means of the particle feature resolving module, materials of metal and non-metal abrasion particles can be accurately recognized, the flow speed and the concentration of the particles can be calculated, a detailed material proportion, size distribution and a real-time concentration thermodynamic diagram can be generated, and the entropy value analysis module is used for analyzing the real-time temperature and pressure data according to the real-time temperature and pressure data. An infinitesimal body entropy change value is accurately calculated, the phase change condition of a lubricant is accurately judged in combination with a preset threshold value, a collaborative diagnosis module carries out deep fusion and analysis on multi-source data, time asynchronism is eliminated through dynamic time warping and other algorithms, an association rule base is established, confidence is calculated, and therefore the fault type of a lubricating equipment component is comprehensively predicted.

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 discloses a pulverized coal flow velocity detection method and device, electronic equipment and a storage medium. The method comprises the following steps: determining the particle size of pulverized coal particles; determining a first model according to the particle size of the pulverized coal particles; performing motion trail tracking on the pulverized coal particles in the second image according to the first model to obtain a motion trail of the pulverized coal particles; displacement information of the pulverized coal particles is determined according to the movement track, and the pulverized coal particle flow velocity is determined according to the displacement information. According to the method, the first model is matched according to the particle size, trajectory tracking is performed according to the first model, different tracking models can be adopted for different particle sizes, and the trajectory tracking accuracy is improved; and the pulverized coal particle flow velocity is determined according to the tracked motion trail, so that the accuracy of pulverized coal particle flow velocity determination can be improved.

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.

A system for trapping a target condensable gas may include a supersonic condensation nozzle configured to receive a gas stream containing a target condensable gas component and accelerate the gas into a supersonic gas stream; at least one particle injector in the supersonic nozzle for injecting particles such that the particles are in the supersonic gas stream, whereby a target gas condensate is formed on a portion of the particles; an expansion device defining a channel having a lobe, causing the flow of particles containing the target gas condensate to generate an expansion wave to separate the flow into a first flow path in which a concentration of particles containing the target gas condensate increases and a second flow path in which a target condensable gas content of the gas decreases; and a diverter having at least a first channel, the diverter configured to collect the first flow path.

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 invention relates to a device (10) for collecting brake dust from a disc brake (102), comprising a particle receiving device (12) for receiving brake particles (BP) generated by friction between a brake pad (110) and a brake disc (108) of the disc brake (102), and one or more flow disturbance bodies (14, 14a, 14b) which are designed to be surrounded by a particle flow (PS) comprising brake particles (BP) and to generate flow vortices (W, WR, WL) in the particle flow (PS), which convert a laminar particle flow (LPS) flowing along the brake disc (108) into a turbulent particle flow (TPS).

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 present invention relates to the technical field of laying devices, and discloses a uniform laying device for a sheet machine used in the production of plastic pallets, including support legs. An inner wall of the support legs is provided with a transfer table, and a mold is arranged on the top of the transfer table. A second fixing plate is fixedly connected to the rear of the support legs. An unloading device is arranged on the right side of the support legs. When starting to lay materials in the present invention, the plastic mold transfer table moves to the designated position for feeding, and then workers add various plastic particles into the housing. The rotating shaft rotates to drive the limiting roller to rotate, so as to limit the outflow of plastic particles, avoid the too-fast outflow of plastic particles, make the unloading more uniform, and avoid the uneven laying of plastic particles in the mold. At the same time, when the arc-shaped plate moves, it can scrape off excessive plastic particles on the surface of the mold, thereby avoiding the waste of plastic particles and enabling the excessive plastic particles to be recycled and reused again.

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.

The present invention relates to a fluidized flotation device and flotation method for wide-size particles, belonging to the field of mineral sorting technology, and solving the problems in the prior art of fluidized flotation that the applicable sorting size is too narrow and the recovery efficiency of all-size particles is too low. The present invention comprises a hydrocyclone, a microbubble generator, a fluid distributor and a flotation column, wherein the hydrocyclone and the microbubble generator are both located on the outside of the flotation column, the fluid distributor is located at the bottom of the flotation column, the microbubble generator is connected to the fluid distributor, the bottom flow port of the hydrocyclone is connected to the feed port of the flotation column, and the overflow port of the hydrocyclone is connected to the feed port of the microbubble generator. The present invention constructs a high-turbulence environment suitable for fine-particle mineralization and a low-turbulence dissipation flow field suitable for coarse-particle recovery in one device, and performs point-feeding on the corresponding size materials, thereby achieving efficient sorting of wide-size materials in all sizes.

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.