440 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 belongs to a complex lithofacies shale reservoir structure weak plane mechanical parameter determination method and system, and belongs to the field of unconventional shale oil and gas reservoir transformation. The method comprises the following steps: carrying out a nanoindentation experiment test on a rock core sample containing a structural weak plane to obtain a macroscopic uniaxial elastic modulus and macroscopic fracture toughness of the structural weak plane; constructing a particle flow discrete element numerical model; on the basis of construction of the particle flow discrete element numerical model and the macroscopic uniaxial elastic modulus and the macroscopic fracture toughness of the structure weak plane, particle flow micromechanical parameter calibration is carried out; and obtaining the mechanical parameters of the weak plane of the structure based on particle flow microscopic mechanical parameter calibration. According to the method, the compressive strength, the elastic modulus, the Poisson's ratio, the cohesion, the internal friction angle, the fracture toughness and the tensile strength of the structure weak plane can be rapidly and accurately predicted, the defect that an existing indoor physical experiment device cannot measure mechanical parameters of a non-standard sample is effectively overcome, and input parameters are provided for fine simulation of hydraulic fracturing of a complex lithofacies shale reservoir.

The invention relates to the technical field of spreading devices, and discloses a uniform spreading device of a sheet machine for plastic tray production, which comprises supporting legs, a conveying table is mounted on the inner walls of the supporting legs, a mold is arranged at the top of the conveying table, a second fixing plate is fixedly connected to the rear parts of the supporting legs, and a discharging device is arranged on the right sides of the supporting legs. When material spreading is started, a plastic mold conveying table moves to a designated feeding position, then various plastic particles are added into a shell by a worker, and a rotating shaft rotates to drive a limiting roller to rotate, so that outflow of the plastic particles can be limited, too fast outflow of the plastic particles is avoided, and discharging can be more uniform; when the arc-shaped plate moves, the plastic particles on the surface of the mold can be scraped off, so that waste of the plastic particles can be avoided, and the excessive plastic particles can be recycled.

The invention relates to the field of multiphase flow numerical simulation, and discloses a multi-scale particle flow calculation method which comprises the following steps: acquiring position coordinates, speed and volume of particles in a current time step; positioning a grid where the particles are located by combining grid distribution in Fluent software, and obtaining a volume value of the grid to calculate a grid particle size ratio at the current moment; calculating grid porosity and background flow field information by adopting different methods according to whether the grid particle size ratio is greater than 3; the porosity, the background flow field information, the particle speed and the particle volume are substituted into a drag force model for calculation, and drag force borne by the particles is obtained; inputting the drag force into EDEM software to iteratively calculate the motion of the particles to obtain the motion state of the particles in the next time step; and adding the negative value of the drag force into a momentum equation of Fluent software in a source item form to iteratively calculate the motion of the fluid to obtain the speed and pressure information of all grids in the next time step. And accurate numerical simulation of the multi-scale particles is realized.

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 a device for continuously sorting a particulate stream, comprising: a) a conveyor (1) for conveying the particulate stream to a separation device, b) a sieve (7) for separating the particulate stream according to size, characterized in that it further comprises c) a per-sieve (3) comprising elongated sieve openings located between the convey or outlet and the sieve d) and a mechanical impact device for providing mechanical impacts to the pre-sieve (3). The pre-sieve allows to separate elongated objects like threads or wires form the particulate stream which would otherwise clog or block subsequent separation devices including the sieve.

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.

The invention relates to a coarse particle fluidized bed column separation kinetic analysis device and method, belongs to the technical field of mineral processing and resource recovery, and solves the problem that fluidized bed column separation kinetic analysis is difficult to systematically develop. The device comprises a fluidized bed column, a filling medium, a slurry supply unit, a water supply unit and a gas supply unit, the fluidized bed column comprises a barrel body, the filling medium is arranged in the barrel body, the volume of the filling medium is reduced from bottom to top in a layered mode, the slurry supply unit comprises a slurry mixing barrel and a first conveying pipeline, and the first conveying pipeline is communicated with the slurry mixing barrel and the top of the barrel body; and the water supply unit is communicated with the air supply unit and then communicated with the lower part of the barrel body. According to the invention, the multi-element and multi-scale filling medium is adopted to disperse fluid and assist fluidization, and is limited between the two screens, so that the use amount of clear water and materials is reduced, a fluidized bed column separation dynamic test is optimized from the aspect of structure, the follow-up wastewater treatment amount of coarse grain mineral fluidized bed column separation of an actual separation plant is reduced, and the production cost is reduced. And the production cost of a selection plant is saved.

System and methods for plasma treatment of a fluidized bed of particles are disclosed. The systems include an energy coupling zone configured to generate a plasma from microwave radiation and an interface element configured to propagate the plasma from the energy coupling zone to a reaction zone. The reaction zone is configured to receive the plasma, receive a plurality of reactant particles in a fluidization plane direction from a fluidization assembly positioned below the reaction zone, and form a product in presence of the plasma. The fluidization plane is substantially perpendicular to the propagated plasma.

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.

The invention relates to the technical field of heat storage and energy conservation, and provides a moving bed high-temperature particle flow and heat transfer characteristic simulation and prediction method and system based on deep learning and electronic equipment. The method comprises the steps that high-temperature particle flow characteristic numerical simulation is conducted, and a three-dimensional moving bed high-temperature particle flow numerical model is established; simulating association of a bed structure, particle properties and particle accumulation and flow pattern rules, and establishing a particle distribution regulation and control strategy; performing numerical simulation on heat transfer characteristics of high-temperature particles, establishing association between particle flow characteristics and a temperature field, simulating a gas-solid two-phase composite heat transfer process of the particles, and establishing a temperature field control strategy; intelligent prediction of particle distribution and a temperature field is carried out, intelligent prediction of particle distribution and the temperature field at a specific moment is realized based on deep learning, and a regulation strategy based on numerical simulation is optimized. The particle flow and heat exchange characteristics of the moving bed are clarified, a theoretical support and a technical solution are provided for improving the waste heat recovery efficiency of the blast furnace slag, and the energy utilization rate can be increased.

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 provides a dense glutenite reservoir hydraulic fracturing crack track judgment method, which comprises the following steps: on the basis of a particle flow method, considering gravel characteristics of dense glutenite, and constructing a glutenite numerical value description model for a dense glutenite reservoir; on the basis of the glutenite numerical description model, establishing a glutenite hydraulic fracturing model to simulate fracturing progress conditions at different moments in the fracturing process; and on the basis of the glutenite hydraulic fracturing model, in combination with the hydraulic fracture track influence factors, the track extension mode of the hydraulic fracturing fracture encountering gravel is judged. According to the method, the main control factors and the track rule of glutenite crack extension are known, the glutenite crack track change is revealed from the microcosmic perspective, the purposes of optimizing construction parameters and controlling the optimal crack form are achieved, and guidance is provided for glutenite hydraulic fracturing engineering design.

The invention discloses a hydrocyclone flow field simulation method based on an adaptive smoothed particle method, and the simulation method comprises the following steps: (1) determining structural parameters of a hydrocyclone, and constructing a geometric model of the hydrocyclone; (2) establishing a basic control equation, and discretizing the basic control equation into an adaptive smoothed particle normal equation; (3) setting boundary conditions and initial calculation parameters on the basis of the geometric model of the hydrocyclone, and then importing the boundary conditions and the initial calculation parameters into a fluid simulation scene for simulation; and (4) respectively monitoring the particle flow at the outlet of the underflow pipe of the hydrocyclone and the flow at the outlet of the overflow pipe, and stopping calculation after the flows at the two outlets are stable, thereby completing simulation. The flow field behavior in the hydrocyclone is simulated through the adaptive resolution smoothed particle method, the change and breakage of the interface in the hydrocyclone can be accurately captured, it is guaranteed that the change at the gas-liquid interface is clear and visible, the track of particles in the hydrocyclone is traceable, and the calculation amount and the calculation time are reduced through the adaptive resolution.

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.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for optimizing energy efficiency for ore smelting in blast furnaces. One of the methods is a pelletization process control method that includes obtaining images of pelletized particles; determining one or more characteristics of the pelletized particles; in response to determining that at least one or more of the characteristics is outside of a pelletization parameter, determining an adjustment to a control parameter of the pelletization system; and sending one or more signals to adjust the control parameter of the pelletization system. Another method is an iron ore smelting method that includes determining quantities of reactants to be added to the blast furnace with the pelletized particles in the stream of pelletized particles; and sending one or more signals that cause the controller to add the reactants of to the blast furnace according to the determined quantities.

The invention discloses a visual device and method for simulating particle flow under water inrush and sand inrush conditions, the device comprises a fixing sleeve piece provided with a rock sample, two ends of the fixing sleeve piece are provided with a cylinder shell and a steel column used for applying pressure to the rock sample; a monitoring unit used for observing the flowing condition of a sand body in the rock sample is further arranged in the fixing sleeve, the whole flowing process of sand grains in a crack is observed through the monitoring unit, the whole flowing process comprises the crack opening degree change and the bridging effect caused by blockage of the sand grains in the crack, the whole flowing process is changed into visualization, and the flow condition of the sand grains in the crack is observed through the monitoring unit. And the understanding of the reason for the moment change of the flow in the water guide channel under the conditions of water inrush and sand inrush in coal mining can be enhanced.

The invention discloses a gantry type double-row pile stress three-dimensional analysis method based on FLAC-PFC coupling. The gantry type double-row pile stress three-dimensional analysis method comprises the following steps that 1, a double-row pile supporting structure model is built through FLAC software; step 2, dispersing side slope particles by utilizing PFC (Power Factor Correction) software; 3, based on the double-row pile supporting structure model constructed in the step 1 and the discrete slope particle flow in the step 2, coupling simulation is conducted on soil around the piles; 4, calibrating mesoscopic parameters of the spherical particles; step 5, performing time step control, boundary condition application, monitoring point deployment and control and gravity loading; and 6, extracting the internal force of the pile body for analysis. According to the gantry type double-row pile stress three-dimensional analysis method based on FLAC-PFC coupling, a continuous numerical analysis method and a discrete element method are combined to research pile-soil interaction, the defects of a single method in analysis can be effectively overcome, and the pile-soil interaction is deeply analyzed.

The invention discloses a device and a method for testing seepage deformation of a compressive fault fracture zone under the action of reciprocating seepage. Comprising a water supply system, an upstream seepage pressure control system, a downstream seepage pressure control system, a water return system, a seepage pressure chamber, a soil-water separation system, a particle collection system, a confining pressure loading system, a flow monitoring system and a computer servo system, the method comprises the following steps: analyzing the loss particle size distribution and loss amount of fine particles collected by a particle collection system to obtain the relationship among parameters such as permeability coefficient, porosity, particle loss condition, effective stress, time and the like in a fault fracture zone sample seepage deformation process under the conditions of reciprocating seepage and different effective stress; the seepage deformation evolution process of the fault fracture zone sample under the action of reciprocating seepage-different effective stress is explored, and a theoretical basis and technical support are provided for guaranteeing long-term seepage stability of water conservancy and hydropower engineering.

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.