697 results about "Porous medium" patented technology

The invention relates to the technical field of hydrogen production, in particular to a bipolar plate runner structure-mass transfer efficiency parameter simulation optimization method. Comprising the steps that a flow channel structure is designed, specifically, a bipolar plate flow channel is constructed through a fractal tree-shaped network topological structure, the flow channel is composed of multiple stages of branch channels, the section size of each stage of branch channel is decreased progressively according to a self-similarity proportion, and a three-dimensional flow channel network with fractal dimensions is formed; multi-physics field coupling modeling: establishing a multi-physics field coupling model including fluid flow, electrochemical reaction and heat and mass transfer based on computational fluid mechanics and a finite element method, wherein the model considers a turbulence effect in a flow channel, interface impedance of a porous medium diffusion layer and reaction kinetic parameters at the same time; parameter sensitivity analysis: screening key parameters influencing mass transfer efficiency through orthogonal test design, including flow channel fractal dimension, branch angle, porosity and surface wettability parameters, and constructing a parameter response curved surface; the flow channel structure of the bipolar plate can be accurately optimized, and the mass transfer efficiency is effectively improved.

The invention discloses a field soil heavy metal pollution health risk dynamic assessment and intelligent early warning system, and relates to the technical field of soil environment monitoring. The system comprises a multi-source data acquisition unit, a data preprocessing unit, a risk calculation engine and a visual interaction terminal. The key technical point is that a dynamic field evolution analysis module and an adaptive grid rendering control module are introduced; the dynamic field evolution analysis module constructs a pollution potential energy field matrix representing a pollutant migration trend based on soil heavy metal concentration and hydrogeological parameters, and calculates a space-time gradient change vector of the pollution potential energy field matrix; and the latter dynamically adjusts the grid local density according to the gradient vector module value, and automatically encrypts the computational nodes in the region with severe risk change. In cooperation with a time sequence prediction deduction and feedback correction mechanism, the method can simulate the dynamic evolution of the pollution plume in the porous medium in real time, solves the problems that a migration rule is difficult to capture and the calculation efficiency of a uniform grid is low in traditional static evaluation, and achieves three-dimensional dynamic risk early warning with high precision and low calculation power consumption.

The invention provides a CO2 sequestration simulation method based on transfer learning and a physical information neural network, which aims at a geological carbon dioxide sequestration process by combining the transfer learning and the physical information neural network, and comprises the following steps of: simulating and generating data by using a Matlab oil reservoir simulation tool box, and constructing a neural network basic model; the physical law of carbon dioxide migration in the porous medium is trained and learned through coarse resolution, then fine tuning is performed on the generated actual geological model data by adopting a migration learning strategy to adapt to different geological structures and injection conditions, and a neural network loss function is embedded in combination with a Darwest equation and a mass conservation equation to obtain a carbon dioxide migration model. Compared with a traditional numerical simulation method, the method has the advantages that the calculation efficiency is remarkably improved while the prediction precision is kept, and the method is suitable for carbon dioxide sequestration optimization and environmental risk assessment under complex geological conditions and has good industrial popularization value and environmental benefits.

The invention relates to the technical field of porous medium seepage, and provides a gray grid Boltzmann porous medium seepage analysis method based on a CT image. According to the method, the equivalent porosity of a local node is determined according to the obtained normalized maximum gray value of a CT image of a porous medium and the normalized gray value of the local node; according to the equivalent porosity of the porous medium, an equivalent permeation model between the equivalent permeability of the local nodes of the porous medium and the normalized gray value of the local nodes of the porous medium is established, and then according to the relation between the permeability of the porous medium in the LBM lattice space and the continuous solid fraction during seepage of the porous medium and the equivalent permeation model, the permeability of the porous medium in the LBM lattice space is calculated. A mapping model between a continuous solid fraction and a normalized gray value is established, gray LBM simulation is directly carried out based on the CT gray value, errors caused by traditional structure simplification and interface fuzziness are effectively overcome, the physical accuracy of complex medium multi-field seepage is improved, and the application range of the complex medium multi-field seepage is widened.

The invention provides experimental equipment and method for simulating filling and sealing of carbon dioxide in a goaf, and the experimental equipment comprises a simulation system, a slurry injection system, a gas injection system, a data acquisition and processing module, a recording, analyzing and displaying module and a data acquisition system. A simulated overlying strata of the simulation system naturally collapses to form a porous medium space model, slurry and carbon dioxide are injected into the porous medium space model through the slurry injection system and the gas injection system, and data acquisition is conducted on the curing process of the carbon dioxide through the data acquisition system; and the data is transmitted to the recording, analyzing and displaying module through the data collecting and processing module. According to the invention, the influence of carbon dioxide on the slurry solidification behavior and the solidification reaction penetration depth can be comprehensively researched, and a scientific basis is provided for optimizing material selection, proportion design and injection process parameters in practical engineering.

The invention discloses a three-dimensional micro-nano multistage micro-channel structure and a preparation method thereof, and the channel structure comprises a substrate, a nano honeycomb layer located on the surface of the substrate, and a Tesla valve micro-channel and a micron fence member formed on the nano honeycomb layer. The micron fence piece is provided with a plurality of rib columns which are close to each other and are arranged along the side wall direction of the Tesla valve micro-channel; the high wicking capacity of the nano porous medium and the macroscopic fluid guiding capacity of the micron channels are organically combined, so that fluid can be rapidly transported in the multi-stage channels, the transporting capacity and the heat exchange efficiency of liquid are effectively improved, especially during boiling, the liquid supplementing rate and the steam discharging rate can reach dynamic balance, and the heat exchange efficiency of the liquid is improved. The friction loss of gas-liquid two-phase flow is reduced, and different thermal management requirements are met; in addition, according to the preparation method, nano-first and micro-second processing is adopted, high compatibility of the structure morphology and the material interface is achieved, good repeatability and process window are achieved, and the preparation method is suitable for large-area preparation and industrial production.

The invention discloses a hydrate-containing porous medium resistivity model construction method considering hydrate heterogeneous distribution, and the method comprises the following steps: 1) manufacturing a rock core according to the rock composition of a target hydrate reservoir, and scanning the pore throat structure of the rock core through CT; 2) generating a hydrate in the core, and scanning the occurrence state of the hydrate through CT (Computed Tomography); 3) establishing a digital core model based on CT scanning data, and applying an electrostatic field; 4) changing hydrate saturation parameters in the model, and calculating the resistivity of the model through numerical simulation; 5) calculating the critical water saturation of the hydrate; and (6) fitting by taking the critical water saturation as a boundary to obtain a resistivity segmentation calculation model. According to the method, a hydrate-containing porous medium resistivity model is established based on a real rock core size, and an electric field simulation means is utilized to calculate a hydrate-containing porous medium resistivity value. In combination with CT scanning data, an undetermined coefficient of a porous medium resistivity calculation formula in a hydrate thermal decomposition experiment is obtained through electric field simulation, and a basis is provided for hydrate reservoir electric heating development.

The embodiment of the invention provides a surfactant synergistic flooding parameter optimization method based on core scale simulation, and the method comprises the steps: selecting a real core sample of a target oil reservoir, carrying out the preprocessing of the real core sample, and constructing a three-dimensional digital core model of the target oil reservoir; selecting a surfactant according to reservoir characteristics of the target oil reservoir; according to the synergistic flooding characteristic and the oil-water two-phase flow characteristic of the surfactant in the pore medium of the target oil reservoir, a surfactant synergistic flooding model under the rock core scale is established; carrying out iterative solution on the synergistic flooding model through parallel calculation to realize dynamic simulation of the synergistic flooding process under the rock core scale, and outputting distribution data of a pressure field, a fluid saturation field and a surfactant concentration field in the three-dimensional digital rock core model; and according to the distribution data, determining a target parameter combination for synergistic flooding of the surfactant. The effect of improving the use degree of crude oil is achieved.

The invention discloses a rock unconventional reservoir carbon dioxide fracturing temperature field simulation method and system, and belongs to the technical field of oil and gas exploitation. Rock unconventional reservoir parameters and wellbore parameters are obtained, fluid physical property parameters of carbon dioxide fracturing fluid flowing in a wellbore are determined, and a multi-dimensional physical partition model is constructed; the unconventional reservoir is divided into a plurality of physical areas including a fluid flowing area, a static fluid area, a solid area and a porous medium area; thermal boundary conditions of all physical areas are coupled through an energy conservation equation, stratum elasticity modulus and Poisson's ratio are added to the thermal boundary conditions, a thermal-force coupling equation is constructed, carbon dioxide fracturing construction parameters obtained in real time are estimated, temperature field distribution nephograms of carbon dioxide fracturing fluid at different moments in the shaft flowing process are obtained, and the temperature field distribution nephograms of the carbon dioxide fracturing fluid at different moments are calculated. According to the method, the temperature distribution rule of different fracturing stages in the shaft-crack direction can be truly reflected.

The invention provides an impedance combined type broadband silencer based on a sound wave black hole gradient structure and a design method, and belongs to the technical field of noise control and environmental protection engineering, the whole impedance combined type broadband silencer is of an axisymmetric cylindrical structure, and the impedance combined type broadband silencer is composed of an inlet and outlet channel and a middle-section expanding type acoustic processing area; the expanded acoustic processing area comprises an inlet and outlet side expansion cavity, a composite impedance gradient perforation section and a porous sound absorption material layer. According to the sound wave black hole type multi-stage perforated ring structure, the sound wave black hole type multi-stage perforated ring structure composed of an axial uniform-parameter perforated ring belt and a radial gradient perforated ring belt is sequentially constructed in the silencer, so that the thickness of a perforated ring and the aperture and the perforation rate of the perforated ring belt are arranged on a propagation path according to a parameter gradient rule; porous materials are filled among the annular bands to form a gradient impedance composite dissipation system, so that sound waves are sequentially subjected to focusing and dissipation caused by geometric gradual shrinkage and viscosity and heat dissipation of porous media in the propagation process, and low-frequency enhanced absorption and wide-frequency-band continuous sound absorption are achieved.

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 method for simulating reaction migration of metal in a xanthate-loaded porous medium. On the basis of a coupling reaction mechanism of metal and an organic complexing agent (xanthogenate) in a porous medium, a multi-surface morphology complexing model (MSM) containing soil native components and xanthogenate is constructed and is combined with a reactive migration numerical model (a coupling water flow and solute migration equation); according to the method, through model calibration and experimental verification, the dynamic migration process of each metal component and the competitive retention distribution of the metal component on different solid-phase components can be accurately simulated and quantitatively analyzed under the complex condition that metal and xanthate coexist.

The utility model discloses a microfluid device and a system for researching abnormal migration of solute of a fractured porous medium system. The microfluid device for studying abnormal migration of the solute of the fractured porous medium system comprises a chip and a substrate, wherein the lower surface of the chip is bonded with the upper surface of the substrate; a crack and a porous medium area distributed around the crack are patterned on the lower surface of the chip; the porous medium area comprises a plurality of cylinders, gaps are reserved among the cylinders, and flow channels communicated with the cracks are formed; and a part or all of the cylinders in the porous medium area are provided with notches serving as blind ends. The microfluid system for studying abnormal migration of the solute of the fractured porous medium system comprises a fluid injection device, the microfluid device and a fluid collection device which are connected in sequence.

The invention discloses a multi-scale fractured porous medium rock physical modeling method and device. The method comprises the following steps: determining an elastic modulus of an equivalent rock containing pores and microscopic cracks by utilizing an equivalent medium model based on respective elastic moduli and geometric factors of a mineral matrix, the pores and the microscopic cracks; on the basis of the elastic modulus of the equivalent rock containing the pores and the microscopic cracks, determining the elastic modulus of the equivalent rock containing the extrusion jet effect of the microscopic cracks; based on the elastic modulus of the equivalent rock containing the microcosmic fracture extrusion jet flow effect, the far-field scattering amplitude caused by each group of mesoscopic fractures is determined, the total far-field scattering amplitude caused by all the mesoscopic fractures is obtained, and the total effective longitudinal wave number is determined; and according to the total effective longitudinal wave number, establishing a multi-scale fractured porous medium rock frequency dispersion and attenuation model. According to the method, the frequency dispersion and attenuation model comprehensively considering the crack scale effect and the frequency dispersion characteristic can be established.

The invention discloses a fluid simulation method for a semi-welded plate heat exchanger, which relates to the technical field of heat exchanger simulation and comprises the following steps: acquiring porous medium parameters of a porous medium model by using a single-side medium three-dimensional model; performing grid division on the single-side medium three-dimensional model to obtain a grid division result of the single-side medium three-dimensional model; according to the porous medium parameters of the porous medium model and the grid division result of the single-side medium three-dimensional model, preliminary flow field trial calculation is carried out based on a k-omega SST turbulence model, and a preliminary flow field trial calculation result is obtained; fitting processing is carried out based on the preliminary flow field trial calculation result, and a semi-welded plate type alternating current device fluid simulation result is obtained. According to the method, single-side overall pressure drop prediction of the semi-welded plate heat exchanger is achieved, on the basis, the turbulence model is used for predicting the flowing condition of media between the plates, the accuracy of heat exchanger flow field calculation is greatly improved, flowing near the wall faces of the plates is closer to the actual state, and the positive effect on prediction of the performance of the heat exchanger is achieved.

The invention relates to the technical field of waste landfill treatment, and discloses a sludge and fly ash mixed filling treatment process which comprises the steps of porous medium composite adsorption medium preparation, ion exchange pre-activation modification, osmotic pressure gradient layer construction, electrochemical activation field formation, ion channel dredging treatment, osmotic pressure self-repairing adjustment, electrochemical self-cleaning maintenance and the like. According to the method, efficient removal and long-term stable treatment of heavy metal pollutants are achieved through the synergistic effect of porous medium enhanced permeation adsorption and ion exchange pre-activation in combination with osmotic pressure gradient directional migration and electrochemical activation, the heavy metal removal rate is high, the landfill system stably operates for a long time, manpower is reduced, and the environmental pollution risk is effectively reduced.

The invention belongs to the related technical field of micro-channel heat dissipation, and discloses a novel porous micro-channel heat exchanger and an optimization design method.The heat exchanger comprises a shell, the bottom face of the shell is used for making contact with a heat source, and a plurality of heat exchange micro-channels are arranged in the shell side by side; porous media are arranged on the bottom face and the two side walls of each heat exchange micro-channel respectively, and pure fluid flow channels are formed in the top and the middle of each heat exchange micro-channel. Considering that the heat flow of the heat source surface of the heat exchange micro-channel is large, the porous media are arranged on the heat source surface and the two connected side faces respectively so as to increase the heat exchange area and enhance heat exchange, the porous media are not completely filled in the heat exchange micro-channel, pure fluid flow channels are reserved in the top and the middle, and the heat exchange area is increased. And smooth flowing of the cooling working medium in the channel can be guaranteed, the flowing resistance is prevented from being obviously increased, and the comprehensive heat exchange performance is greatly improved.

The present invention discloses a multi-objective thermal-fluid topological design optimization method for the cooling element of a precision gear grinding machine tool, comprising the following steps: Step 1: Define the design domain: Expand the cooling element into a plane, define a two-dimensional design domain representing the cooling element's geometric structure, and discretize it using the finite element method; Step 2: Numerical modeling: Model the cooling element as a porous medium; Under the conditions of laminar incompressible flow, the fluid dynamics are governed by the dimensionless forms of the continuity equation and the momentum equation; The fluid-solid coupled heat transfer model is governed by the dimensionless energy conservation equation; Step 3: Construct an objective function: The optimization objective is defined as a weighted function of heat transfer and fluid dissipated power, and a fluid-solid heat transfer topological optimization model is constructed; Step 4: Solve the objective function; Step 5: Restore the shape and structure of the cooling element. The present invention also discloses a precision gear grinding machine tool and a cooling element.

The invention discloses a multi-scale bidirectional coupling sweating cooling simulation method which comprises the following steps: firstly, on a mesoscale, constructing a mesoscopic flow model, simulating flow of a coolant, and obtaining parameters such as porosity, permeability and inertia coefficient of a porous medium; introducing the obtained parameters into a porous medium panel area of a thrust chamber geometric model constructed under a macroscale to realize cross-scale parameter coupling; the flow and heat transfer process in the thrust chamber geometric model after cross-scale parameter coupling is simulated, and the speed, pressure, temperature and local heat flux density distribution of a combustion chamber and a porous medium panel area under the macroscale are obtained; and taking the local heat flow density as a new wall surface boundary condition, capturing the flow and heat transfer characteristics of a coolant in pores under a thermal state working condition based on the mesoscopic flow model, and further evaluating the overall cooling performance and the thermal protection effect of the porous medium panel. Through coupling calculation of the mesoscopic pores and the macroscopic combustion chamber, the accuracy and reliability of prediction of the cooling performance of the porous medium are improved.

The invention discloses a high-pressure CO2 oil displacement micro-fluidic chip device which comprises an upper polar plate, a middle partition plate, a lower polar plate, a speed measurement module, a porous medium radial flow module and a liquid outlet module, the speed measurement module is arranged on the upper surface of the middle partition plate; the porous medium radial flow module and the liquid outlet module are arranged on the upper surface of the lower polar plate; the upper polar plate, the middle partition plate and the lower polar plate are sequentially stacked from top to bottom; the speed measurement module is connected with the porous medium radial flow module; and the porous medium radial flow module is connected with the liquid outlet module. According to the device disclosed by the invention, a pore throat structure in rock is simulated by constructing a micron-sized or even smaller complex flow channel, and the CO2 flooding crude oil flow characteristic and the CO2 distribution rule are simulated; a transparent visualization device structure is designed, and visualization of the action mechanism of the CO2 oil displacement system and the reservoir fluid distribution characteristics is guaranteed.

The invention discloses a resistance coefficient calculation method and device of a porous medium, the medium and equipment. The method comprises the steps that a three-dimensional geometric model of target equipment is constructed, a simulation area of the porous medium in the three-dimensional geometric model is determined, a simulation experiment is conducted on the target equipment, and an inlet and outlet experiment pressure difference is obtained; constructing an optimization model based on an inlet and outlet experiment pressure difference and an inlet and outlet simulation pressure difference, wherein the inlet and outlet simulation pressure difference is obtained by performing fluid simulation calculation on a three-dimensional geometric model based on a CFD control equation, a continuity equation, a CFD momentum conservation equation, a viscous resistance coefficient and an inertial resistance coefficient of a simulation area; taking the optimization model as a target function in a population algorithm, wherein position variables corresponding to individuals in the population algorithm are a multidirectional viscous resistance coefficient and a multidirectional inertial resistance coefficient; and solving the optimization model based on a population algorithm to obtain an optimal viscous resistance coefficient and an optimal inertial resistance coefficient. The identification accuracy of the inertial resistance coefficient and the viscous resistance coefficient is improved.

A method for predicting a multi-physics field coupling process of natural hydrogen flow-heat transfer-rock thermal strain in underground pores belongs to the field of natural hydrogen resource exploration, and is characterized in that a multi-physics field coupling model for describing natural hydrogen flow-heat transfer-rock thermal strain in formation pores is established based on phase field variables; the method comprises the following steps: establishing a porous medium geometric model according to a rock underground pore structure, performing grid division on the porous medium geometric model to obtain a plurality of grid units for reflecting different spatial distribution positions of natural hydrogen in the rock underground pore structure, and setting initial conditions and boundary conditions of the porous medium geometric model; according to the multi-physics field coupling model, solving the space-time evolution characteristics of the hydrogen volume fraction, the water volume fraction, the fluid temperature, the rock skeleton matrix temperature and the rock skeleton matrix thermal strain value of each grid unit of the porous medium geometric model to obtain the distribution in time and space; according to the method, the reservoir forming mechanism and the reservoir forming stability of the natural hydrogen are evaluated more accurately and systematically.

The invention discloses a full-size shell-and-tube heat exchanger service performance analysis and calculation method based on domain solving and cross-dimension coupling, and aims to solve the problem that the number of calculation resources needed by full-three-dimensional modeling numerical simulation of a shell-and-tube heat exchanger is large. Through key technologies of one-dimensional tube pass fluid calculation, full-size shell pass fluid porous medium fluid calculation, shell-and-tube heat exchanger thermodynamic calculation and data mapping, a multi-physics field cooperative calculation framework is constructed by applying domain solving and cross-dimension coupling, and the calculation complexity is remarkably reduced while the precision is guaranteed; flow heat transfer characteristics and mechanical characteristics of the shell-and-tube heat exchanger are analyzed. The method comprises the following steps: 1, setting shell-and-tube heat exchanger tube pass fluid; 2, setting shell pass fluid of the full-size shell-and-tube heat exchanger; 3, tube pass fluid and shell pass fluid are coupled; 4, bidirectional flow heat exchange coupling calculation; 5, bidirectional flow heat exchange coupling calculation; 6, thermal-mechanical coupling calculation of the heat transfer pipe; 7, quickly calculating and analyzing the service performance of the shell-and-tube heat exchanger; and 8, analyzing the mechanical properties of the shell-and-tube heat exchanger under the service condition.

The invention discloses a sewage solid-liquid separation treatment method based on porous media, which comprises the following steps: physically filtering sewage, pretreating the physically filtered sewage, sequentially carrying out single interception treatment on the pretreated sewage through three layers of composite porous media from coarse to fine, and carrying out solid-liquid separation treatment on the treated sewage. Performing backwashing on the sewage subjected to single interception treatment to realize secondary interception treatment, discharging the sewage subjected to secondary interception treatment into a liquid pool for storage, performing dewatering and drying treatment on solid-phase sludge subjected to single interception and secondary interception, and putting the solid-phase sludge into a solid pool for storage. Through a three-in-one technical chain of gradient interception, functional modification and intelligent regeneration, the core problems of low efficiency, high energy consumption, short service life, difficulty in sludge disposal and the like in traditional solid-liquid separation are systematically solved, and the method has remarkable technical competitiveness and commercial popularization value in the field of industrial wastewater treatment.

The invention discloses a catalytic porous medium clean combustion reactor for hydrogen-ammonia blended fuel, and relates to the technical field of reactors. The reactor comprises a reactor body, wherein a filtering assembly and a crushing assembly are mounted at the top of the reactor body; a combustion chamber is arranged in the reactor body, a ceramic porous plate is arranged on the combustion chamber, and an air inlet pipe, an air outlet pipe and a catalysis pipe are arranged on one side of the reactor body. A composite crushing structure of primary crushing of the crushing rods and secondary impact of the elastic crushing rods is adopted, and the crushing efficiency is improved by 40% or above compared with a traditional rigid structure; a conical filter screen of the filter assembly is matched with a clamping piece rapid dismounting and mounting mechanism, the screening efficiency is improved by 30%, shutdown is not needed in the impurity recycling process, retention materials can be collected by connecting lead screws between an annular shielding plate of a sliding shielding piece and an upper barrel body and a lower barrel body of a rotary fixing barrel, and the manual maintenance cost is reduced.

The invention discloses a porous medium sweating and cooling combustion chamber based on a ceramic matrix composite material, and relates to the technical fields of gas turbines, new energy and the like. In order to solve the problem of combustion instability such as combustion oscillation of a traditional gas turbine combustion chamber, a ceramic-based porous medium combustion chamber structure is adopted, liquid fuel infiltrates from the outer wall face of a porous medium and is evaporated and gasified on the inner wall, and then combustion occurs. The gasification reaction of the liquid fuel in the porous medium and on the wall surface can take away a large amount of heat, so that the effects of heat insulation, heat protection and wall surface cooling are achieved, and the combustion chamber can be protected from thermal damage. On the other hand, traditional jet flow or rotational flow combustion is replaced by wall face evaporation combustion, and combustion oscillation caused by uneven mixing or jet flow is avoided.

The invention relates to the technical field of carbon capture, utilization and storage, and particularly discloses a CO2 mineralization and storage device and method based on multi-field coupling and multi-phase interface regulation, the device comprises a reaction kettle, an injection system and a monitoring system, a paddle is rotatably arranged in the reaction kettle, a distributed heating system is further arranged in the reaction kettle, and the injection system is connected with the monitoring system. The reaction kettle is used for establishing an axial temperature gradient in the reaction kettle, and an ultrasonic-microwave coupling generation device is arranged outside the reaction kettle in a surrounding manner; the injection system comprises a CO2 injection device and an atomized water injection device, and further comprises a plurality of porous rings arranged at intervals in the depth direction of the reaction kettle, a plurality of spray holes are formed in the inner peripheries of the porous rings at intervals in the circumferential direction, the directions of the spray holes are tangent to the circumferential direction of the porous rings, and porous media are embedded in the spray holes; the monitoring system is used for monitoring the temperature, humidity and pressure in the reaction kettle. According to the method, through temperature gradient induction and dynamic humidity regulation and control, the CO2 diffusion rate and the surface reaction rate are synchronously increased, and the mineralization efficiency and the product stability are improved.

The invention relates to the technical field of coal-based solid waste resource utilization and mining area ecological restoration, in particular to a coal-based solid waste artificial soil directional pore construction waste dump ecological restoration method which comprises the steps that S1, coal-based solid waste is mixed according to a certain mass ratio; s2, mixing organic matters according to a mass ratio; s3, mixing the mixture obtained in the step S2 with the bacterial liquid; s4, compounding the mixture in the step S3 and the mixture in the step S1; s5, the mixture obtained in the step S4 is mixed with aluminum powder and calcium hydroxide; s6, drying after fermentation in S5, and screening the particle size range to obtain a porous medium; s7, holes are punched in the surface of the waste dump, and then the porous media are buried in the holes; s8, the switchgrass and the apocynum venetum are compounded according to the proportion; s9, planting plants in holes in S7 in a hole sowing manner; and S10, monitoring according to a certain period. The coal-based solid waste resource utilization efficiency and the mining area ecological restoration quality are comprehensively improved through coal-based solid waste particle size and mineral component regulation and control, porous medium pore directional construction and soil-vegetation system coupling.

The invention provides a capillary core heat pipe utilizing a low heat conduction material to overcome boiling limit, which comprises a heat pipe shell, a steam channel and a capillary core structure, the steam channel and the capillary core structure are arranged in the shell, and the capillary core structure is a composite capillary core and comprises a high heat conduction metal porous medium layer arranged on the inner wall of an evaporation section of the heat pipe shell and a high heat conduction metal porous medium layer arranged on the inner wall of an evaporation section of the heat pipe shell. The low-heat-conductivity hydrophilic porous material layer is communicated with the high-heat-conductivity metal porous medium layer through fluid, and the heat conductivity coefficient of the low-heat-conductivity hydrophilic porous material layer is lower than that of the high-heat-conductivity metal porous medium layer. The boiling limit and the maximum heat transfer capacity of the heat pipe are remarkably improved, through introduction of the low-heat-conduction material layer, heat is effectively prevented from being transmitted to a liquid backflow deep layer, the superheat degree of a liquid supply channel is greatly reduced, nucleation and growth of bubbles are fundamentally restrained, and the heat transfer limit caused by the fact that the bubbles block a flow channel is avoided. Therefore, the heat pipe can stably work under higher heat flux density, and the performance bottleneck of a traditional metal capillary core is broken through.

This invention provides a silicon carbide porous combustion medium plate and a silicon carbide porous medium burner, relating to the field of porous medium combustion technology. The silicon carbide porous combustion medium plate has three-dimensional continuous pores, formed by a single or multiple triple-period minimal surface structures. The average curvature at each point on the triple-period minimal surface structure is zero, which can effectively reduce the concentration of thermal stress. The combustion medium plate prepared from silicon carbide slurry based on this structure has high compressive strength, which is beneficial to improving the service life of the silicon carbide porous combustion medium plate. The porous medium burner using this silicon carbide porous combustion medium plate utilizes its interconnected pores to promote uniform mixing of combustible gas and air. The combination of multiple triple-period minimal surface structures can specifically regulate the internal flow behavior of the mixed gas, thereby improving the thermal performance of the porous medium burner.