383 results about "Porous medium" patented technology

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 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 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 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 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 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 buffering and flow stabilizing device for an iodine working medium space propulsion system, which comprises a buffering cavity, the input end of the buffering cavity is connected with the output end of an iodine storage and supply module through a pipeline, the output end of the buffering cavity is connected with the input end of a thruster module, at least one group of rectifying components is arranged in the buffering cavity, and the rectifying components are connected with the thruster module through a pipeline. A porous medium plate covering an inner side port of the output end of the buffer cavity is installed at the output end of the buffer cavity, a plurality of temperature sensors and pressure sensors are further installed in the buffer cavity, and the temperature sensors and the pressure sensors are in communication connection with a control module of the iodine working medium space propelling system; and the control module feeds back and adjusts heating parameters of the iodine storage and supply module through data collected by the temperature sensor and the pressure sensor. By means of the mode, the iodine vapor supply stability can be improved, solid particles entering the propeller are reduced, and the thrust stability is improved.

The invention relates to a porous medium CT image segmentation method, system and device and a medium, and the method comprises the steps: obtaining a rock core sample, and scanning the rock core sample through a CT device to obtain a CT image of the rock core sample; the method comprises the following steps: preprocessing a CT image of a rock core sample, and extracting a main part of gray level distribution in the CT image as an image to be analyzed; performing multi-distribution fitting on the to-be-analyzed image to obtain a multi-distribution fitting image; and performing intelligent threshold segmentation on the multi-distribution fitting image to obtain an image segmentation result containing different pore filler boundaries. According to the method, through gray feature extraction, multi-distribution fitting, intelligent threshold segmentation and result optimization, precise segmentation of pores containing different pore fillers in the rock is realized, the precision and reliability of pore filler analysis are remarkably improved, and the method can be widely applied to the technical field of intelligent identification of porous medium components.

The embodiment of the invention discloses a method and device for testing foam seepage characteristics of a heterogeneous porous medium, electronic equipment and a storage medium, and relates to the technical field of fluid mechanics and nuclear magnetic resonance. The method comprises the steps that a heterogeneous porous medium sample with a clear permeability level difference is prepared, and the permeability level difference of the heterogeneous porous medium sample is determined; setting test parameters according to the permeability level difference of the sample, calibrating imaging parameters of the low-field nuclear magnetic resonance equipment, and setting a weighting mode; performing foam flooding treatment on the sample according to the set injection parameters, acquiring a spectrum of the sample according to the test parameters when foam is injected into a set amount, and acquiring nuclear magnetic imaging of the sample through low-field nuclear magnetic resonance equipment according to imaging parameters and a weighting mode; according to the relaxation characteristic of the spectrum, the main peak endpoint value is used for dividing the pore channel, the foam sweep degree is calculated according to the spectrum peak area of the spectrum, and the foam plugging strength is calculated according to the signal amplitude of nuclear magnetic imaging. According to the method, the problems of poor visualization adaptability and lack of evaluation systems in the prior art are solved.

A kind of porous medium combustor performance detection method, including the following steps: establishing multi-scale combustion model, for describing the complex physical process inside porous medium combustor, including microscale modeling, mesoscale modeling, macro scale modeling, complete multi-scale coupling and optimization;Obtain structural parameters and operating conditions;Numerical simulation and simulation;Performance evaluation and comparative analysis.

The invention discloses a molecular dynamics modeling method and system for a porous medium, and relates to the technical field of molecular dynamics modeling, and the method comprises the following steps: recognizing pore voxel regions and non-pore voxel regions based on a three-dimensional matrix, and carrying out the boundary division of a plurality of non-pore voxel regions, and obtaining a boundary layer anchor point pool and a non-boundary layer anchor point pool; dividing the boundary layer anchor point pool and the non-boundary layer anchor point pool into a plurality of grid units, and filling the anchor points in the grid units through the to-be-filled molecules based on the target filling number and the target mask value; randomly rotating the current to-be-filled molecule, and if the distance between the current to-be-filled molecule and the placed atom is smaller than the corresponding minimum distance threshold value, abandoning the current placement; and after filling of all molecules is finished, counting space absolute coordinates of all atoms, and outputting a coordinate file. According to the method, accurate and non-overlapping placement of molecules in a complex pore structure is realized, and establishment of a porous medium complex random pore microcosmic molecular dynamics model can be realized.

The invention discloses a carbon-deficient wastewater nitrate removal method based on water flow power, and belongs to the technical field of water treatment and environment restoration. According to the method, NO3-containing wastewater flows through a porous medium reactor at a certain flow speed, and contact between water flow and the surface of a filling material is utilized; the method comprises the following steps: by taking NO3 as a raw material, separating and inducing a contact electric effect, generating hydrogen free radicals with strong reducibility in situ, and realizing efficient non-biological reduction by utilizing a chemical reaction of the hydrogen free radicals and NO3 under the condition of not depending on an external carbon source or a chemical reducing agent. The method is mild in reaction condition, can be operated at normal temperature and normal pressure, has the advantages of simplicity and convenience in operation, low cost, no secondary pollution, wide medium source, reusability and the like, and is particularly suitable for NO3 pollution treatment in underground water, agricultural drainage and other carbon source lacking scenes.

The invention discloses a battery pole piece baking parameter prediction method, electronic equipment and a storage medium, and relates to the technical field of lithium ion battery manufacturing. The method comprises the following steps: S1, acquiring wind field data based on oven CFD simulation and processing the wind field data into convective heat transfer and mass transfer boundary conditions; s2, calculating a pole piece temperature field and residual solvent content by using a heat and mass transfer resistance model and an energy equation; s3, judging the fluidity of the slurry according to the solvent content: solving a momentum equation considering gravity, wind shear force and surface tension when the content is high, and calculating capillary seepage of the porous medium when the content is low; and S4, explicit iterative calculation is carried out until a pole piece parameter estimated value is output. According to the method, the problem of macroscopic and microscopic scale coupling calculation is avoided through step-by-step decoupling, and the dynamic drying process of the slurry can be accurately reflected.

The invention discloses a porous medium combustor unit regeneration system and a regeneration method thereof, and relates to the technical field of combustors, the porous medium combustor unit regeneration system comprises a porous medium combustor unit and a premixed gas pipeline connected with the porous medium combustor unit, the burner further comprises a waste gas pipeline, a premixing pipeline stop valve, a matching buckle cover and a compressed air pipeline branch pipe, the waste gas pipeline communicates with the porous medium burner unit, the waste gas pipeline stop valve is arranged on the waste gas pipeline, the premixing pipeline stop valve is arranged on the premixing gas pipeline, and the matching buckle cover is arranged on the compressed air pipeline branch pipe. The matching buckle cover is detachably buckled on the porous medium burner unit to form a closed space, at least one compressed air connector is arranged on the matching buckle cover, and the compressed air pipeline branch pipe is communicated with the compressed air connector and provided with a branch pipe cut-off valve. The integral online regeneration of the porous medium combustion unit can be realized, the operation is simple, the risk of disassembly and damage is avoided, and the service life of the combustor is effectively prolonged.

The invention belongs to the technical field of geophysical exploration and oil and gas reservoir evaluation, and particularly relates to a heterogeneous dolomite reservoir fractal rock physical modeling method. The method comprises the following steps: data acquisition and processing: acquiring ultrasonic velocity and attenuation data, and acquiring acoustic logging data and post-stack seismic data of a target layer; constructing a fractal rock physical model; generating a multi-band rock physical drawing board; drawing board correction and reservoir parameter quantitative prediction. The fractal dimension serves as a clear and predictable key parameter to be introduced into the dolomite rock physical model for the first time, the limitation that a traditional model can only predict the pore volume (porosity and fracture content) but cannot describe the pore structure form is broken through, the precision and dimension of reservoir physical property prediction are improved, and the reservoir physical property prediction accuracy is improved. By combining an infinite heavy pore medium model with a fractal theory, the established model can simulate propagation of waves in an actual complex porous medium more truly, spanning from two dimensions to three dimensions is realized, and multiplicity of reservoir prediction is greatly reduced.

The application discloses a kind of microscale microplastic migration occurrence multi-physical field coupling simulation method, belong to ecological environment field.The method aims at solving the problem that existing microplastic migration model ignores interface adsorption process, is difficult to couple the action of multiple physical fields and is not suitable for the problem of insufficient adaptability to heterogeneous environment.Its main points are: in the Lagrangian framework, by constructing seepage field, and comprehensively calculating the stokes drag, dielectrophoresis force and Brownian force suffered by microplastic particles to track its movement, while explicitly introducing the adsorption and desorption between particles and pore wall, to simulate the migration trajectory and occurrence state of microplastic in heterogeneous porous medium.The application provides a high-precision simulation tool for revealing the environmental fate and health risk of microplastics in groundwater systems.

This application relates to the field of smart medical technology and discloses a method and system for monitoring medication adherence in patients during ovulation induction cycles. This invention significantly improves the accuracy and reliability of ovulation induction medication adherence assessment in complex home environments by deeply integrating the real physical boundaries of the human body, the mechanical rigidity constraints of instruments, and the fluid dynamics laws of porous media into a visual monitoring framework. Specifically, this application utilizes dynamic pixel physical mapping and biomechanical filtering technology to effectively eliminate the interference of lens distortion and physiological tremors, reconstructing a pure kinematic sequence. By using a finite state machine with dual boundaries of force application and limit, it accurately identifies and coherently processes the mid-process pauses caused by patients' fear of pain, completely solving the defect of traditional algorithms that are prone to logical breaks.

This utility model provides an electrically assisted heating glass tempering furnace, belonging to the technical field of glass deep processing equipment. It includes a furnace body, a reflector plate located inside the furnace body, and several conveying rollers. The reflector plate is located below the conveying rollers. An electric heating wire is installed at the top of the furnace body. The conveying rollers are arranged alternately. Each conveying roller includes a porous media outer cylinder, a porous media inner cylinder, two sleeves, and an ignition rod. The two sleeves are respectively fixed to both ends of the porous media inner cylinder, located outside the porous media inner cylinder. An inner liner tube is fixedly installed at each end of the porous media outer cylinder, located inside the porous media outer cylinder. The inner liner tube and the sleeve are rotatably connected via bearings. The sleeves are fixedly connected to the furnace body. One end of the porous media inner cylinder has a premixed gas connection pipe, and the ignition rod extends from the other end of the porous media inner cylinder and is inserted inside the porous media inner cylinder. This utility model has advantages such as low energy consumption and uniform glass heating.

The application discloses a hot water boiler based on a porous medium burner, which comprises a hot water boiler shell, wherein the hot water boiler shell comprises a boiler barrel, the outer side of the boiler barrel is provided with a water jacket for storing water, and the inside of the boiler barrel is fixedly provided with a porous medium burner; the inner cavity of the porous medium burner comprises a combustion reaction zone, the two ends of the combustion reaction zone are provided with anti-backfire areas, the two ends of the porous medium burner are provided with mixed gas inlets, the mixed gas inlets are connected with mixed gas input pipelines, one end of the mixed gas input pipelines extends out of the hot water boiler shell and is connected with a gas fuel supply device; the porous medium burner is internally provided with an ignition device, mixed gas flows into the combustion reaction zone from the mixed gas input pipelines and is ignited by the ignition device, heat generated by combustion of the mixed gas heats water in the water jacket, flue gas is discharged from the combustion reaction zone through the pores of the porous medium of the porous medium burner and is discharged into a flue gas treatment mechanism connected with the hot water boiler shell, the gas utilization rate is improved, and the heat diffusion speed is slowed down.

The present application relates to a kind of wide load stable combustion and low nitrogen emission ammonia fuel porous medium burner, belong to clean combustion and zero carbon fuel utilization technical field.It includes: ammonia fuel import pipe fitting, ammonia catalytic cracking component, porous medium combustion support component are sequentially arranged from inside to outside;Fuel enters ammonia catalytic cracking component by ammonia fuel import pipe fitting;Fuel in ammonia catalytic cracking component is set to crack, generate mixed gas, mixed gas enters between ammonia catalytic cracking component and porous medium combustion support component;Medium is arranged between ammonia catalytic cracking component and porous medium combustion support component, mixture formed by introduced air and mixed gas is rich combustion condition, and is discharged from the right side of porous medium combustion support component.The present application can efficiently organize ammonia catalytic cracking, porous medium reinforced combustion and catalytic denitration integrated burner, realize the efficient stable clean combustion of ammonia fuel.

The utility model discloses a porous medium heat dissipation enhancing assembly of a high-thermal-conductivity UVC ceramic support, which belongs to the field of ceramic supports and comprises a ceramic support body, a heat dissipation assembly is arranged at the upper end of the ceramic support body, and positioning holes are formed in corners of the ceramic support body. Positioning columns are fixedly installed at the corners of the lower side of the heat dissipation assembly, the four sets of positioning columns are movably inserted into the four sets of positioning holes, inserting rods are movably inserted into the heat dissipation assembly and the four sets of positioning columns, and locking assemblies are arranged in the four sets of positioning columns. Through the arrangement of the locking assembly, the porous medium heat dissipation enhancing assembly of the high-heat-conductivity UVC ceramic support can be rapidly mounted and dismounted, tedious operation caused by a traditional screw fixing mode is avoided, the working efficiency is greatly improved, meanwhile, due to the fact that screws are not needed for fixing, the phenomenon of thread slipping is avoided, and the service life of the high-heat-conductivity UVC ceramic support is prolonged. And the service life of the assembly is prolonged.

The utility model belongs to the technical field of glass drill bits, and particularly relates to an anti-blocking drill bit. Comprising a drill bit body, the drill bit body is provided with a containing cavity with an opening facing a blade part, a rod part of the drill bit body is provided with a water injection channel which is arranged along the rod part and communicated with the containing cavity, and a porous medium is arranged in the containing cavity. According to the drill bit, the containing cavity with the opening facing the blade part is formed in the drill bit body, the water injection channel communicated with the containing cavity is formed in the rod part, meanwhile, the containing cavity is filled with the porous medium, and by means of the filtering performance of the porous medium, glass fragments are effectively prevented from entering the water injection channel, but water in the water injection channel cannot be blocked from flowing out; therefore, the problem of channel blockage is avoided. When the porous medium needs to be replaced, the glass fragments in the containing cavity can be quickly cleaned up only by simply taking out the old porous medium and replacing the old porous medium with a new porous medium, the machine does not need to be shut down for complex cleaning operation, the drilling efficiency and operation convenience are remarkably improved, and meanwhile the drilling quality is guaranteed.

The present invention relates to a substrate processing method and a system for the same. The substrate processing method comprises the steps of: vaporizing an organic inhibitor compound under reduced pressure from a porous medium impregnated with an organic inhibitor compound; and selectively depositing the vaporized organic inhibitor compound on a first region of the substrate under a first pressure for, for example, a predetermined time in a first chamber containing a substrate to form a self-assembled monolayer containing the organic inhibitor compound on the first region of the substrate.

The invention relates to the technical field of combustors, in particular to a TPMS porous medium combustor and a two-way air inlet using method thereof.The TPMS porous medium combustor comprises a combustor body and a TPMS porous medium heat accumulator filled in the combustor body, air inlet pipes which are symmetrically arranged are fixed to the two sides of the combustor body, and the ends of the air inlet pipes are fixedly communicated with premixing pipes; the air supply pipes are symmetrically fixed to the side wall of the premixing pipe, and an airflow adjusting assembly is arranged on the premixing pipe and used for adjusting the flow speed of airflow pumped by the air supply pipes; the partition plate is fixed in the air inlet pipe, and the partition plate divides the air inlet pipe into a buffer chamber and a conveying chamber; the conveying pipe is fixed to the air inlet pipe and communicates with the conveying cavity and the combustor, and a communicating assembly is arranged in the air inlet pipe; and the buffer pushing mechanism is arranged in the air inlet pipe, and when the air pressure in the buffer cavity is gradually increased, the conveying pipe can be controlled to be gradually conducted through a conduction assembly, so that high-frequency oscillation caused by air pressure fluctuation is avoided.

The invention belongs to the technical field of geological storage of carbon dioxide, and particularly provides a method for evaluating the stability of foam in a porous medium and a visual characterization device thereof. According to the method, a combined strategy of triggering in-situ bubbling at a high flow rate and then closing the well for closed observation is adopted, so that bubble coalescence, coarsening, redistribution and long-term binding capability can be directly identified. Besides, in combination with image preprocessing, non-solid-phase region identification, gas phase segmentation and connected domain analysis, a stability evaluation index system is established to provide a stability evaluation method, and quantitative evaluation is performed on the storage stability in combination with an inverse proportion approximation relation between the number of bubbles and time in the bubble group curing process. The method for evaluating the stability of the foam in the porous medium and the visual characterization device of the method provide effective theoretical support for a carbon dioxide foam flooding prediction method and sealing efficiency evaluation under complex geological conditions.

The application discloses a kind of rock gas relative permeability measurement method based on lattice Boltzmann method, comprising the following steps: (1) determining the porosity corresponding to each water saturation grade of rock, using four-parameter growth method to generate the rock porous medium model consistent with the porosity of each water saturation grade rock;(2) using lattice Boltzmann method to carry out gas seepage simulation, the bias pressure of gas boundary is applied to the rock porous medium model, the gas permeability and relative permeability of rock porous medium model under different porosity are calculated;(3) draw the curve of rock gas relative permeability and different water saturation, determine the relative permeability of rock under different water saturation.The application carries out gas seepage simulation by rock porous medium model and lattice Boltzmann method, obtains the permeability of rock porous medium model under different water saturation, and then calculates the relative permeability, constructs the functional relationship between rock sample water saturation and relative permeability, to determine the rock gas relative permeability simply and effectively.