323 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 discloses an operation state evaluation method and system for the deep peak regulation process of a fluidized bed unit, and relates to the technical field of fluidized beds, and the method comprises the steps: collecting the combustion condition data of the deep peak regulation process of the fluidized bed unit; generating a particle flow velocity vector diagram, and identifying and marking different flow modes and paths in the particle flow velocity vector diagram; generating a non-uniform index of the whole flow field through particle flow velocity and particle concentration distribution of each flow mode area in the flow field; generating a bed temperature distribution diagram, recognizing a high temperature-flow mode region by combining with the particle flow velocity vector diagram, and calculating a coking risk index of the high temperature-flow mode region; and calculating a coking risk index of the whole flow field, comparing the coking risk index of the whole flow field with a risk threshold value, and when the coking risk index of the whole flow field is greater than or equal to the risk threshold value, giving out an early warning, identifying potential risks, and avoiding serious problems such as coking.

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.

In one embodiment, an electronic system comprises a display device to display data and processing logic coupled to the display device. The processing logic is configured to determine a duty cycle of at least one sensor for sensing flow of a product or particle through a product or particle line of an agricultural implement and to determine an amount of product or particles flowing through a line of the agricultural implement based on the duty cycle of the at least one sensor.

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.

The invention discloses a pneumatic conveying system straight pipe auxiliary air inlet adding analysis method and device, and belongs to the technical field of pneumatic conveying, and the method comprises the following steps: simulating particle flow in a pulverized coal conveying pipe through simulation software in combination with an Ergun resistance model, and obtaining basic data; determining a pulverized coal initial deposition point according to the data, adding a first auxiliary air inlet, then adjusting the air inlet speed at a fixed included angle, changing the air inlet angle at a fixed speed, and recording the backward moving range of the initial deposition point; then single-dimension experiments are carried out to research the influence of all parameters on pressure drop, response surface optimization analysis is applied to construct a power consumption coefficient formula and optimize experiment results, and finally an auxiliary air inlet adding scheme is obtained through rounding processing. By optimizing auxiliary air inlet parameters, pulverized coal deposition can be reduced, pressure drop and power consumption of a conveying pipe are reduced, the performance of a pneumatic conveying system is improved, and the method has important application value in the pneumatic conveying fields of thermal power plants, mining industry and the like.

The invention relates to the technical field of fluid dynamics, in particular to a lattice-Boltzmann method-based thin particle flow two-way coupling modeling method, which comprises the following steps of: performing field domain discretization by selecting spatial resolution, performing collision migration and viscosity coefficient setting, establishing a time step sequence and a fluid initial speed, determining a speed disturbance parameter, and establishing a two-way coupling model; calculating particle volume fraction and density distribution to obtain a speed distribution function set. According to the method, the spatial resolution is selected for field domain discretization, so that flow field division is more refined, the motion resolution of particles in different regions is enhanced, and the numerical error of the particles in a local region is reduced. And through collision migration and viscosity coefficient setting, it is ensured that the particles are evenly stressed in different flowing states, and the stability of the particle motion trail is improved. A time step sequence and a fluid initial speed are established, so that the time advancing process of particle movement is kept consistent, and speed deviation caused by mismatching of time steps is reduced.

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 provides a gas disturbance type viscous ultrafine particle fluidization reaction device system and method. The gas disturbance type viscous ultrafine particle fluidization reaction device system comprises a fluidization reaction unit, a gas supply unit, a multidirectional gas supply unit and a gas-solid separation unit, the fluidization reaction unit comprises a reaction cavity, and a gaseous zone and a dense-phase zone are sequentially arranged in the reaction cavity in the axial direction; the gas supply unit is connected with the bottom of the reaction cavity and is used for providing primary gas flow for the dense-phase region; the multidirectional air supply unit comprises an air supply module and a plurality of air supply assemblies, the air supply module is connected with the air supply assemblies, and the air supply assemblies are independently connected with the reaction cavity, communicate with the dense-phase region and are used for providing secondary airflow; and the gas-solid separation unit is connected with the gaseous region. Through reasonable configuration and structural arrangement of the multidirectional air supply units, uniform flowing and gas-solid efficient contact of materials in the fluidization reaction cavity are realized, and the problems of particle agglomeration and channeling are solved.

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 an airborne particulate matter laser-induced breakdown spectroscopy (LI BS) detection and analysis device and method. The device comprises a measurement device frame; the negative pressure airborne particle flow system comprises an airborne particle flow pipe, a negative pressure airflow unit and a particulate matter supply unit, the airborne particle flow pipe is not limited by gravity and can be horizontally or vertically installed, a through hole is formed in the middle of the airborne particle flow pipe, the axis of the through hole perpendicularly intersects with the axis of the airborne particle flow pipe, and the diameter of the through hole is smaller than that of the airborne particle flow pipe. The negative pressure airflow unit is connected with the two ends of the airborne particle flow pipe, and the particle supply unit is linked with the negative pressure airflow unit and conveys particles to the airborne particle flow pipe to form stable particle flow; the particle flow LI BS detection system comprises a laser, a spectrometer and a light path, and realizes LI BS spectrum excitation and detection. The device is simple in structure, the particle flow system does not need a sealing window, and particulate matter leakage-free circulating detection analysis is achieved.

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.

A microchannel includes a single inlet and a single outlet, a spiral section downstream from the single inlet, a straight section downstream from the spiral section, a detection section downstream from the straight section, and an expansion section downstream from the detection section and disposed between the detection section and the single outlet. The microchannel is to receive fluid having particles. In addition, at least the straight section and the detection section are configured to orient particles within the detection section in an area away from sidewalls of the detection section and into one of a single particle stream or two particle streams. The two particle streams immediately adjacent to each other appear as a single particle stream for optimized focusing and orientation of the particles in a focused stream within the microchannel.

A classification method according to an embodiment includes a first step and a second step. At the first step, a fluid is caused to flow into a micro flow channel having a spiral shape. At the second step, target particles as recovery targets contained in the fluid are classified. For a combination of the micro flow channel and the target particle at the second step, a relation of De / Rep≤4.68 is established between a particle Reynolds number Rep and a Dean number De.

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 is a flow-through flow-through filter that can separate raw water and / or sewage to filtered stream, fine particle stream and grit stream in one hydraulic device. For raw lake and / or canal water intake application, the flow-through filter is placed inside a chamber box that is mounted on a water intake rack structure or diversion canal. The invention filters debris and organisms to prevent biomes formation in pumps and waterlines that delivers raw water to a water treatment plant. The flow-through filter withdraws flows from a raw water body without taking defined sediment, floating debris and target aquatic biomes and eliminates the need of discharging remnants to a sewage system.For wastewater treatment, the flow-through filter is installed over a wet well after the headwork rack and may replace the grit removal, primary clarifier, and the fine screening. The flow-through filter requires a much smaller footprint of the area and / or enclosed building that requires smaller odor control. There is a substantial cost saving of using one device and replaces grit removal, primary basin, and fine screening.

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).

A method and apparatus for producing urea ammonium sulfate granules. In a first fluidized bed, a first spraying liquid is sprayed, the first spraying liquid comprising a urea melt and an aqueous ammonium sulfate solution, for example, a (near) eutectic mixture. The bed temperature is lower than the crystallization temperature of the sprayed mixture. In a next compartment, the granules are fluidized to form a second fluidized bed. A second spraying liquid comprising a urea melt is sprayed into the second fluidized bed, the second fluidized bed having a bed temperature higher than the bed temperature of the first fluidized bed and lower than the crystallization temperature of the sprayed second spraying liquid.

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.