Fusion platform and method for evaluating foam molding strength, deformation toughness, and plugging rate

Abstract

The present invention provides a fusion platform and method for evaluating foam forming strength, deformation toughness and plugging rate, and relates to the technical field of disaster prevention and control foams in porous areas of underground coal mines, and can comprehensively evaluate the application performance of different foam plugging materials. A constant pressure autoclave is provided on the left side of the transparent cavity shell, and external carrier gas is input into the autoclave through a gas supply pipe. A movable tension and compression plate is provided on the right side of the autoclave, and a rigid porous medium material is placed on the right side of the cavity shell. A transverse temperature control unit is provided in the porous medium, and a filtering and coloring gas collecting pipe is provided directly above the temperature control unit. A foam high-speed outflow device is installed in the cavity to inject foam into the porous area. A two-way jet cleaning device is provided between the temperature control unit and the foam high-speed outflow device. Water vapor control panels with the same properties are provided on the upper and lower sides of the porous medium, respectively. A liquid uniform distribution outflow device is provided on the upper part of the upper water vapor control panel, and a water storage tank is provided at the lowest part of the cavity.

Description

[0001] The invention relates to the technical field of foam prevention and control of disasters in porous areas of underground coal mines. Background Art

[0002] Foam materials have good expansion, asphyxiation, flame retardancy and water retention and cooling properties, and are widely used in preventing spontaneous combustion of coal in porous fracture areas underground in coal mines. Especially in underground coal mines, foam also has a very significant improvement effect on coal fire control and goaf sealing.

[0003] According to the mechanism of coal spontaneous combustion, the key to preventing coal spontaneous combustion lies in controlling the degree of oxygen binding to coal and preventing the coal from oxidizing and heating up. Foam is widely used for fire retardancy in coal mines due to its good sealing properties, strong water-retention and cooling properties, and excellent diffusivity. Using foam to seal goafs or other porous media areas can effectively reduce air leakage and lower oxygen concentrations. Furthermore, in the early stages of coal spontaneous combustion, the coal itself slowly oxidizes and dissipates heat, raising the temperature of the coal seam. The foam contains a large amount of water, which can effectively absorb the dissipated heat and prevent the next stage of coal spontaneous combustion. Foam has excellent diffusivity and can effectively penetrate the cracks between coal, achieving full coverage. Patent No. CN111855431A discloses a device and method for evaluating the performance of plugging materials, which mainly includes a test kettle, a kettle cover, a pulley, a gravity module, a pressure rope, and a brake. The gravity of the gravity module is used to pressurize the plugging material. The compression of the plugging material is used to calculate the expansion and contraction rate to evaluate the pressure-bearing performance of the plugging material. However, the test parameters are too simple and do not directly reflect the sealing performance of the sealing material. In actual applications, there are cases where the sealing material has good pressure bearing capacity but poor plugging performance. Summary of the Invention

[0004] In view of this, the embodiments of the present invention provide an integrated platform and method for evaluating foam molding strength, deformation toughness and plugging rate, which can realize the comprehensive evaluation of the molding strength, toughness, plugging efficiency and foaming performance of different foam plugging materials at different temperatures, and can be applied to the experimental research on the comprehensive performance of foam plugging materials.

[0005] The present invention provides a fusion platform for evaluating foam forming strength, deformation toughness, and plugging rate, including:

[0006] The transparent chamber shell is used to hold the test medium and perform the main test process.

[0007] The constant pressure autoclave is used to collect external carrier gas, can apply pressure to the movable tension and pressure plate to the right at a fixed pressure to make it move to the right, and is arranged on the left side of the cavity shell.

[0008] The gas supply pipeline is used to input external carrier gas into the pressure autoclave and is connected to the pressure autoclave.

[0009] The liquid uniform distribution outflow device is used to uniformly supply water to all directions of the porous medium area. It is composed of a water supply pipe, a liquid accumulation area, an outflow pipe, and an annular outflow device with a concave body on the truncated table on the upper part of the cavity shell.

[0010] A water supply pipe is used to supply water to the liquid uniform distribution outflow device and is connected to the liquid accumulation area.

[0011] The upper water and gas control plate is used to isolate and dredge the liquid uniform distribution outflow device and the porous medium area, and is arranged at the lower part of the liquid uniform distribution outflow device and the upper part of the porous medium area.

[0012] The porous medium area is used to hold porous medium materials and simulate the coal accumulation state in the porous goaf of a mine, and is arranged in the right middle of the cavity shell.

[0013] A movable tension and compression plate is used for pulling the foam to form and compressing the porous medium area, and is arranged between the pressure autoclave and the porous medium area.

[0014] The lower water and gas control plate is used to withstand the downward pressure of the porous medium material in the porous medium area and the pressure of the seeping water, and is arranged at the lower part of the porous medium area.

[0015] A water storage tank is used to store and measure drainage from the porous medium area and is arranged at the bottom of the cavity shell.

[0016] The temperature control unit is waterproof and high temperature resistant, is used to control the temperature of the porous medium area, and is installed at a horizontal position in the middle of the porous medium area.

[0017] The real-time temperature monitor is used to detect the temperature of the porous medium area and is installed on the surface of the temperature control unit.

[0018] The temperature control panel is used to set the temperature and heating rate of the temperature control unit and is installed on the right side of the temperature control unit.

[0019] The oxygen concentration detection device is used to measure the oxygen concentration at different positions of the pressure autoclave and the porous medium area, and is installed on one side of the pressure autoclave and the porous medium area.

[0020] The foam high-speed outflow device is used for spraying different types of foam materials. The nozzle is provided with a plurality of small holes and is installed at the upper and lower parts of the porous medium area.

[0021] The foam generating device pipeline is used to supply foam prepared from different foam raw materials to the foam high-speed outflow device and is connected to the foam high-speed outflow device.

[0022] Positioning echo sounder, used to detect the completion of foam plugging, is located at the bottom of the upper water and gas control panel.

[0023] The drainage and pressure relief device is used to relieve pressure in the cavity shell and discharge water in the water storage tank, and is connected to the lower part of the water storage tank through a pipeline.

[0024] The two-way jet cleaning device is used to clean the residual foam liquid and the gaps in the porous medium after the foam detection is completed. It is located between the temperature control unit and the foam high-speed outflow device.

[0025] The liquid inlet curved hose is used to provide different types of cleaning agents to the two-way spray cleaning device and connect the two-way spray cleaning device with the water storage tank.

[0026] The filtered colorimetric gas collecting tube is used to detect the adverse gases that may be produced after the foam temperature rises. According to the depth of the color, the concentration level is independently divided to determine the corresponding environmental protection performance.

[0027] An electronic balance is used to weigh the weight of the water discharged from the water storage tank and is installed below the drainage and pressure relief device.

[0028] The cavity shell is made of transparent PVC material, and the ratio of the transverse length to the cross-sectional width is between 1:1 and 1:10. A scale is set on the outer wall for measuring the moving distance of the movable tension and compression plate.

[0029] The upper and lower water and gas control panels are made of carbon fiber material and can withstand high pressure and high temperature. A positioning echo sounder is installed at the bottom of the upper water and gas control panel to detect foam contact in real time with an acquisition frequency of 100 Hz. It can realize intelligent recognition of the conversion between solid and filtrate states by the control module. It consists of a driving mechanism, a movable baffle, a buffer spring, a pressure sensor, and a triangular support, and the whole can realize the conversion between solid and filtrate plates.

[0030] The driving mechanism consists of a driving gear, a driven gear, a chain, and a driving gear oil tank. The driven gear and the driving gear are connected by a chain to form a gear transmission mechanism. The driven gear is connected to the movable baffle to drive the movable baffle to move between the slots.

[0031] The movable tension and compression plate is made of PEG hydrophilic material and consists of 20-30 concave particles. The protrusion direction points to the pressure autoclave. Continuous grooves are arranged in the concave particles. The grooves are provided with hook-shaped bodies. Barbs are arranged on the hook-shaped bodies. The barb angle is 0-60° with the tangent direction. The movable tension and compression plate can move laterally, moving to the left to pull the foam into shape, and moving to the right to squeeze the porous medium area.

[0032] The porous medium material is made of porous particles with a porosity of 5-30%, simulating the dispersion of different coal piles, wherein the porous medium area is filled with rigid media such as ceramics, bricks and tiles, saddle-shaped fillers, glass fibers, coal blocks, etc.

[0033] One oxygen concentration detection device is arranged in the autoclave, and five are arranged on one side of the porous medium area, evenly distributed with a distance of 20-30 cm between them. They are used to measure the oxygen concentration at different positions in the porous medium area and are waterproof, high temperature and high pressure resistant.

[0034] The temperature control unit is embedded in the middle of the porous medium area. The upper limit of the heating temperature is 200°C and the lower limit is 50°C. The temperature control accuracy is within 5%. The heating rate is controlled at 0.5-5°C / min. It is waterproof and high temperature resistant.

[0035] The bidirectional jet cleaning device is arranged in two in the porous medium area, and the length accounts for 50-60% of the lateral length of the entire container, which can realize the front and back bidirectional cleaning effect, cleaning the residual foam in the gap between the movable tension and pressure plate and the porous medium forward, and cleaning the foam high-speed outflow device and the temperature control unit backward, which can realize pressurized flushing and cleaning effects.

[0036] The filtering and color-developing gas collecting pipe is equipped with a negative pressure fan driven by a motor at the front end of the pipe, an air-sensitive filter absorption net made of fine filter cotton, and three transparent glass tubes with a diameter of 2.0-2.4 cm filled with different detection reagents. It mainly detects the three main toxic gases SO2, NH3, and NO2. The three do not interfere with each other. They are arranged side by side at the rear end of the gas collecting pipe. The concentration level can be divided by observing the color change to determine whether it is environmentally friendly.

[0037] The method for evaluating foam forming strength, deformation toughness and plugging rate of the present invention comprises:

[0038] S1. Arrange the evaluation platform, adjust the water vapor control panels to solid plates, set the temperature parameters of the temperature control unit of the heating element on the temperature control panel, and inject foam prepared by different foam raw materials through the foam generating device pipe;

[0039] S2, the upper water and gas control plate is placed close to the porous medium area, and bubbles are injected through the foam high-speed outflow device. When the positioning echo sounder at the lower part of the upper water and gas control plate senses bubbles, the foam production is stopped, and the volume of the foam stock solution used V2 is recorded;

[0040] S3. The movable tension and compression plate is pulled to the left at a constant speed until the foam is completely detached, and the length of the foam pulled ΔL is recorded. Pressure P is applied to the autoclave through the air supply system, and the tension and compression plate moves to the right due to the pressure difference until the tension and compression plate remains stationary. The final distance ΔH moved to the right by the tension and compression plate is measured.

[0041] S4, switching the upper and lower water and gas control panels to the filtrate panel state, opening the pressure relief valve to release pressure and then closing it;

[0042] S5. Supply water m1 into the chamber. After time t, open the pressure relief valve to drain the water. Measure the amount of water leaking out from the bottom to the electronic balance m2. Then supply clean water again to clean the instrument.

[0043] S6. Change the temperature of the heating element and the foam raw material, and repeat steps S1-S5.

[0044] In the step S1 , the foam molding strength is characterized by the pulling distance ΔL.

[0045] In step S2, the overall elastic deformation of the foam is calculated by the right pressure length change ΔH. Evaluate the foam space deformation toughness.

[0046] In step S3, the permeability is calculated by the water supply m1 and the water leakage m2. and oxygen concentration c at different locations to evaluate foam plugging efficiency.

[0047] Calculate the foam expansion multiple by the void volume of the porous medium area and the volume of the foam stock solution Evaluate foam foaming performance.

[0048] The foam plugging material includes non-Newtonian foams such as calcified foam, high molecular polymer foam, nano foam, three-phase foam, cross-linked foam and gel foam.

[0049] The comprehensive sealing performance of the foam at different temperatures is evaluated based on the foam molding strength, spatial deformation toughness, plugging efficiency and foaming performance.

[0050] The larger ΔL is, the stronger the foam molding strength is, the larger the elastic deformation σ is, the better the spatial toughness is, the lower the permeability η and oxygen concentration c are, the better the plugging effect is, and the larger the expansion multiple λ is, the better the foaming performance is.

[0051] The embodiment of the present invention is a fusion platform for evaluating foam molding strength, deformation toughness and plugging rate. The sealing environment of the porous goaf is simulated by perspective cavity shell and internal porous medium area. Porous medium material can be placed in the right middle part of the cavity shell. A horizontal temperature control unit is provided in the porous medium. A real-time temperature monitor is provided on the surface of the temperature control unit for increasing and detecting the temperature of the porous medium area to simulate the sealing condition of the foam in the porous goaf under different temperature environments. A foam generating device is provided in the cavity shell, and a pipe is connected to the foam high-speed outflow device to inject foam into the porous medium area. An upper water and gas control panel is provided on the upper part of the porous medium, and a liquid uniform distribution outflow device is provided on the upper part of the upper water and gas control panel, which is connected to an external water supply device through a water supply pipe. A positioning echo detector is provided at the lower part of the upper water and gas control panel, and a lower water and gas control panel is provided at the lower part of the porous medium. A water storage tank is provided at the lowest part of the cavity, and a drainage and pressure relief device is provided outside. A pressure autoclave is set on the left side of the cavity shell and connected to the air supply pipe. The pressure autoclave is pressured by the pressure difference on the movable tension and compression plate set on the right side of the pressure autoclave to pull the foam into shape and compress the porous medium area, which is used to evaluate the foam molding strength and spatial deformation toughness. An oxygen concentration detection device is laid on the lower side of the porous medium area to detect the oxygen concentration at different positions of the pressure autoclave and the porous medium area to evaluate the sealing effect of the foam on the simulated porous medium area. A two-way jet cleaning device is set between the temperature control unit and the foam high-speed outflow device to flush and clean the residual foam. A filtering and coloring gas collecting pipe is added to the temperature control unit. According to the different color depths of the gas and indicator, they are compared with the minimum gas concentration standard to evaluate the environmental protection performance of the foam. According to the obtained data, a comprehensive evaluation of different foams in sealing porous medium areas at different temperatures can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The following will be combined with the attached Figure 1-9 The specific structure of the present invention and the technical effects produced are described in detail so as to fully understand the purpose, characteristics and effects of the content of the present invention.

[0053] Figure 1 This is a schematic diagram of the overall structure of the fusion platform for evaluating foam molding strength, deformation toughness and plugging rate of the present invention;

[0054] Figure 2 This is a schematic structural diagram of a liquid uniform distribution outflow device according to an embodiment of the present invention;

[0055] Figure 3 This is a schematic structural diagram of a concave annular outflow device on a circular platform according to an embodiment of the present invention;

[0056] Figure 4 Schematic diagram of the structure of the upper and lower water and gas control panels according to an embodiment of the present invention;

[0057] Figure 5 This is a schematic diagram of the structure of a movable tension and compression plate according to an embodiment of the present invention;

[0058] Figure 6 This is a schematic structural diagram of a foam high-speed outflow device according to an embodiment of the present invention;

[0059] Figure 7 This is a schematic structural diagram of a bidirectional jet cleaning device according to an embodiment of the present invention;

[0060] Figure 8 This is a schematic diagram of the structure of the filtering and coloring gas collecting pipe according to an embodiment of the present invention;

[0061] Figure 9 This is a flow chart for evaluating the performance parameters of the porous medium area plugging foam of the present invention. DETAILED DESCRIPTION

[0062] like Figure 1 As shown, the present invention provides a fusion platform for evaluating foam molding strength, deformation toughness, and plugging rate. It is suitable for comprehensive evaluation of the molding strength, elastic deformation, spatial toughness, plugging rate, and expansion multiple of foam plugging materials at different temperatures. It is applicable to the performance measurement, evaluation, research, and modification analysis of foam plugging materials at high temperatures. It is characterized by including:

[0063] The transparent cavity shell 1 is used to hold the test medium and carry out the main test process. The shell is made of transparent PVC material and can withstand a high temperature of 200°C and a pressure of 20MPa. One side is marked with a scale and is located at the movable tension and pressure plate position. The constant pressure autoclave 2 is set on the left side of the cavity shell and is used to collect external carrier gas to apply pressure to the right. An air supply pipe 3 is set outside the pressure autoclave, and the external carrier gas is transported to the pressure autoclave through the pipe. Similarly, a water supply pipe 5 is set outside the liquid uniform distribution outflow device 4, and water is supplied to the liquid uniform distribution outflow device 4 through the pipe. The upper water and gas control plate 6 is located between the liquid uniform distribution outflow device and the porous medium area 7 and is made of carbon fiber material. It can realize the switching between the solid plate and the filtrate plate. A positioning echo detector 8 is installed on the lower surface to sense the arrival of the foam front. The porous medium area 7 is arranged in the middle of the cavity shell and is used to hold porous medium materials with a porosity of 5-30%. The void volume of the porous medium area is recorded as V1, and foam sealing material is injected into it to simulate the real porous medium area environment. The porous medium area is filled with rigid media such as ceramics, bricks and tiles, saddle-shaped fillers, glass fibers, and coal blocks.

[0064] The high-speed foam outflow device 9 in the porous medium zone 7 is connected to the foam generating device pipeline 10, into which various plugging foam materials for evaluation are injected. The movable tension and compression plate 11 pulls the foam leftward and can press the porous medium zone 7 rightward. The pulling and rightward pressure distances can be read from the scale of the cavity shell. The lower water vapor control plate 12 is located at the bottom of the porous medium zone to withstand the downward pressure of the porous material in the porous medium zone. The water vapor control plates are all made of carbon fiber material and can be switched between solid plates and filtrate plates. When pressurized, the water vapor control plates are in a solid plate state and are adjusted to a filtrate plate state when water is supplied. A water storage tank 13 is located at the bottom of the cavity shell to store and measure the drainage from the porous medium zone. The lower portion of the water storage tank is connected to a pressure relief drain valve 14 via a pipeline, which is used to relieve pressure within the cavity shell and drain the water in the water storage tank. The mass of the water flowing out of the water tank is weighed using an electronic balance 15. The heating element temperature control unit 16 is set in the middle of the porous medium area. The ambient temperature of the porous medium area is adjusted by the temperature control panel 17. The upper limit of the heating temperature is 200℃ and the lower limit is 50℃. The temperature control accuracy is within 5%, and it is waterproof and resistant to high temperature and high pressure. Six real-time temperature monitors 18 are evenly arranged above and below the heating element temperature control unit to record the temperature of the porous medium area. It is waterproof and resistant to high pressure. An oxygen concentration detection device 19 is arranged in the autoclave, and five are placed under the porous medium area. The distance between each two is 20-30cm. It is used to measure the oxygen concentration at different positions of the porous medium area. It is waterproof and resistant to high temperature and high pressure. The two-way jet cleaning device 20 is located between the temperature control unit and the foam high-speed outflow device. It is symmetrically distributed along the central axis of the temperature control unit, which can realize the cleaning of the temperature control device and the foam high-speed outflow device in all directions. The filter color development gas collection pipe 21 is used to evaluate the environmental performance of the foam by observing the color depth changes of the color development tube and comparing it with the corresponding concentration gradient standard.

[0065] In addition, based on the data from the oxygen concentration detection device, the average oxygen concentration is calculated, and the plugging performance level of the tested plugging foam is determined according to the following values. Oxygen concentration c < 5% is Level I, 5% ≤ c < 10% is Level II, and 10% ≤ c is Level III. The lower the oxygen concentration value, the higher the level and the better the plugging effect.

[0066] Figure 2This is a schematic diagram of the structure of the liquid uniform distribution outflow device according to an embodiment of the present invention. The liquid uniform distribution outflow device is used to store water supplied to the porous medium area. In the upper part of the cavity shell, it is composed of a water supply pipe 4-1, a liquid accumulation area 4-2, an outflow pipe 4-3, and a concave annular outflow device 4-4 on a truncated cone. The bottom of the water supply pipe is lower than the upper part of the outflow pipe, with a height difference of 5-20 cm. The diameter of the outflow pipe shortens from top to bottom, and the ratio of the upper and lower diameters is 1.5-3.0. Five water supply pipes 4-1 are provided, respectively located at the four corners and the most central position of the liquid uniform distribution outflow device. The bottom of the water supply pipe 4-1 is 1 cm higher than the bottom of the liquid accumulation area 4-2. 196 outflow pipes 4-3 are provided, arranged in a 14×14 pattern. The inlet of the outflow pipe 4-3 is 9 cm higher than the inlet of the water supply pipe, that is, 10 cm higher than the bottom of the liquid accumulation area 4-2. The water supply pipe 4-1 supplies water to the liquid accumulation area 4-2. When the water level exceeds the height of the outlet pipe 4-3, it will seep out evenly from each outlet pipe to achieve the purpose of evenly distributing the outflow.

[0067] Figure 3 The concave annular outflow device 4-4 on the truncated platform of the present invention is located below the outflow pipe 4-3. The top of the concave annular outflow device on the truncated platform is connected to the outflow pipe below the liquid outflow device, which can reduce the impact of the pressure of the liquid due to the height difference. The top of the concave annular outflow device under the truncated platform is dug downward to form a concave circular cavity design 4-4-1, and the edge curve conforms to the liquid turbulent velocity distribution curve. That is, the velocity is high in the middle and gradually decreases towards the sides. This helps maintain a consistent velocity across the liquid's falling section, preventing it from splashing around. Once the concave circular cavity 4-4-1 is filled with liquid, it flows evenly toward the concave annular outflow device on the circular platform. The annular surface of the concave body is surrounded by small circular openings 4-4-2, with the diameter increasing by 20% from the top downward, resulting in an 85% opening ratio. This circumferential design enables 360° uniform water spraying.

[0068] Figure 4 This is a schematic diagram of the structure of the upper and lower water vapor control plates 6 and 12 of the present invention. The upper and lower water vapor control plates are composed of a drive mechanism, a movable baffle 6-1, a buffer spring 6-2, a pressure sensor 6-3, and a triangular support 6-4. The device drive mechanism controls the movement of the movable baffle 6-1, and the pressure sensor 6-2 is set to a pressure threshold. When the movable baffle 6-1 contacts the buffer spring 6-2 and pressure sensor 6-3 in the slot of the triangular support 6-4, and the pressure exceeds the set pressure threshold, the movable baffle stops moving, achieving communication and isolation between the liquid uniform distribution outflow device, the porous medium area, and the water storage tank.

[0069] The drive mechanism consists of a driving gear 6-5, a driven gear 6-6, a chain 6-7, and a driving gear oil tank 6-8. The motor provides power, and the driven and driving gears are connected by a chain to form a gear transmission mechanism. The driven gear is connected to the movable baffle, driving it to move between the slots. The oil tank provides lubrication, extending the service life of the gears.

[0070] Figure 5 This is a schematic diagram of the structure of a movable tension and compression plate according to an embodiment of the present invention. The movable tension and compression plate is made of a PEG hydrophilic material 11-1, which can increase the contact viscosity with the foam material and provide a better fit. The movable tension and compression plate is composed of 20 concave particles. The concave curve is approximately a parabola, which increases the contact area with the foam. The convex direction points to the pressure vessel. A groove is set in each concave particle to further increase the surface area. A hook-shaped body 11-2 is set in the concave part of the groove. Barbs are added to the hook-shaped body. The barb angle is 30° to the tangential direction to increase the adhesion of the concave part to the foam. A hook-shaped body 11-2 is set in the convex part of the groove. At this time, the barb angle is 45° to the tangential direction to increase the adhesion of the convex part to the foam. Compared with the straight plate pulling method, the contact area can be increased by more than 10 times, and the adhesion to the foam can be increased by more than 20 times.

[0071] The movable tension and compression plate 11 can move laterally, moving leftward to pull the foam to form and evaluate the foam forming strength, and moving rightward to squeeze the porous medium area to evaluate the foam deformation toughness.

[0072] Figure 6 This is a schematic diagram of the structure of a high-speed foam discharge device 9 according to an embodiment of the present invention. The nozzle is surrounded by numerous small holes 9-1, achieving a 90% porosity ratio, enabling rapid and uniform foam discharge across the porous medium. Based on the fluid continuity equation, the holes decrease linearly from the inner wall outward, increasing foam discharge speed and uniformity. The holes maintain a circular cross-section and are mounted at the upper and lower portions of the porous medium.

[0073] Figure 7This is a schematic diagram of the structure of a bidirectional jet cleaning device 20 according to an embodiment of the present invention. There are two bidirectional jet cleaning devices, one located between the temperature control unit and the upper and lower foam high-speed outflow devices, symmetrically distributed along the central axis, and the length accounts for 50-60% of the horizontal length of the entire container, with a height difference of about 60 cm; the bidirectional jet cleaning device consists of a front pressurized jet port 20-1, a double-layer connecting cavity, a rear annular jet port 20-2, and a liquid inlet curved hose; wherein the front jet port 20-1 is a spherical cavity consisting of a drainage section, a throat section, and a jet port section, with a front-to-back ratio of 1:2 to achieve high-pressure jetting. Jet flushing of porous medium gaps and front-end foam residue; the rear annular jet port 20-2 gradually shrinks along the axis and is distributed in a trapezoidal shape, wherein the jet ports are located in a circle of the annular surface and are evenly distributed, forming an angle of 30° with the axial direction, wherein the jet ports are located in a circle of the annular surface and are equidistantly distributed 6 times, which can realize the cleaning of the all-round temperature control device and the foam high-speed outflow device; the front end of the liquid inlet curved hose is connected to the rear annular jet port cover end, and the rear end is connected to the liquid accumulation area of ​​the liquid uniform distribution outflow device, and is equipped with a valve switch, which can adjust the time, angle and range according to needs, so as to realize the recycling of water resources and achieve the maximum cleaning effect.

[0074] Figure 8 This is a schematic diagram of the structure of the filtering and colorimetric gas collecting tube 21 according to an embodiment of the present invention. The fan is driven by a motor to form a negative pressure gas entrainment, and the mixed gas is collected by a HEPA filter absorption net. The three-phase colorimetric tube is composed of three transparent glass tubes arranged side by side with a tube diameter of 2.0-2.4 cm, which is convenient for observing color changes. It mainly detects SO2, NH3, and NO2, three main toxic gases. Among them, SO2 changes color to a red gradient due to different concentrations when it encounters silica gel, NH3 changes color to a yellow gradient due to different concentrations when it encounters Nessler's reagent, and NO2 changes color to a pink gradient due to different concentrations when it encounters aminobenzenesulfonic acid and 1-naphthylamine reagent. By observing the color depth changes of the colorimetric tube and comparing with the corresponding concentration gradient standards, the environmental protection performance of the foam is evaluated.

[0075] In addition, the concentration gradient standard is defined according to the color depth of the filtered color collecting pipe, and the environmental performance level of the tested plugging foam is determined according to the following values. SO2 concentration C<0.15mg / m 3 Light red, 0.15 mg / m 3 ≦C<0.5mg / m 3 Red, 0.5 mg / m 3 ≤C is dark red. The lower the SO2 concentration, the lighter the color, and the better the environmental performance; NH3 concentration C<0.1mg / m 3 Light yellow, 0.1 mg / m 3 ≦C<0.2mg / m 3 Yellow, 0.2 mg / m 3≤C is brown. The lower the NH3 concentration, the lighter the color and the better the environmental performance. NO2 concentration C<0.12mg / m 3 It is light pink, and the NO2 concentration is 0.12mg / m 3 ≦C<0.24mg / m 3 Pink, NO2 concentration C≥0.24mg / m 3 It is dark pink. The lower the NO2 concentration, the lighter the color and the better the environmental performance.

[0076] Figure 9 This is a flow chart for evaluating the performance parameters of the porous medium region plugging foam of the present invention, which includes:

[0077] S1. Arrange the evaluation platform, adjust the water vapor control panels to solid plates, set the temperature parameters of the temperature control unit of the heating element on the temperature control panel, and inject foam prepared by different foam raw materials through the foam generating device pipe;

[0078] S2, the upper water and gas control plate is placed close to the porous medium area, and bubbles are injected through the foam high-speed outflow device. When the positioning echo sounder at the lower part of the upper water and gas control plate senses bubbles, the foam production is stopped and the volume of the foam stock solution used V2 is recorded;

[0079] S3. The movable tension and compression plate is pulled to the left at a constant speed until the foam is completely detached, and the length of the foam pulled ΔL is recorded; pressure P is applied to the autoclave through the air supply system, and the tension and compression plate moves to the right due to the pressure difference until the tension and compression plate remains stationary, and the final distance ΔH moved to the right by the tension and compression plate is measured.

[0080] S4, switch the upper and lower water and gas control plates to the filtrate plate state, open the pressure relief valve to release the pressure and then close it; supply water m1 into the cavity;

[0081] S5. Supply water m1 into the cavity. After time t, open the pressure relief valve to drain the water. Measure the amount of water leaking out from the bottom to the electronic balance m2. Then supply clean water again to clean the instrument.

[0082] S6. Change the temperature of the heating element and the foam raw material, and repeat steps S1-S5.

[0083] In order to clearly illustrate the technical solution and effects of the embodiments of the present invention, the following description will be given by taking into account the performance evaluation of a plugging foam as a plugging material:

[0084] Arrange the fusion platform for evaluating foam forming strength, deformation toughness, and plugging rate. Adjust the upper and lower water vapor control plates to the filtrate and solid plate states, respectively. Fill the porous medium area with the porous medium material. Fill the cavity with water until it just covers the porous medium area. Adjust the lower water vapor control plate to the filtrate state. After all the water flows into the water storage tank, measure the volume of water discharged (V1). Then, open the pressure relief drain valve to drain the water. Close the pressure relief drain valve, adjust the upper and lower water vapor control plates to solid plates, and fill the porous area with plugging foam through the foam high-speed outflow device connected to the foam generating device pipeline until foam is felt on the lower surface of the upper water vapor control plate. Pull the movable tension and compression plate to the left until all the foam is released. Record the distance moved, ΔL. Adjust the movable tension and compression plate to its initial position. Introduce external carrier gas through the air supply line to apply pressure to the autoclave, maintaining pressure P. The movable tension and compression plate, due to this pressure, compresses the porous medium region to the left until it remains stationary. Record the distance ΔH the plate compresses to the left. Adjust the upper and lower water vapor control plates to filtrate plates, and open the pressure relief valve to release pressure. Close the pressure relief valve, adjust the upper and lower water vapor control plates to filtrate and solid plate positions, respectively, and supply water m1 to the cavity housing. If a leak occurs due to inadequate sealing, such as in the water storage tank, wait for a period of time, t, and measure the amount of water m2 in the water storage tank.

Claims

1. A fusion platform for evaluating foam forming strength, deformation toughness and plugging rate, characterized in that: A constant pressure autoclave is arranged on the left side of the perspective cavity shell, and the outside of the pressure autoclave is connected to the air supply pipe for air supply. A movable tension and pressure plate is arranged on the right side of the pressure autoclave, and a scale line is engraved on the position of the movable tension and pressure plate corresponding to the cavity shell. A porous medium material can be placed in the right middle part of the cavity shell, and a horizontal temperature control unit is arranged in the middle of the porous medium. A real-time temperature monitor is arranged on the surface of the temperature control unit. A filtering and coloring gas collecting pipe is arranged directly above the temperature control unit. A plurality of oxygen concentration detection devices are laid on the lower side of the porous medium, and foam is injected through a foam high-speed outflow device. An upper water and gas control panel is arranged on the upper part of the porous medium, and a liquid uniform distribution outflow device is arranged on the upper part of the upper water and gas control panel, which is connected to a water supply pipe for water supply. A positioning echo detector is arranged on the lower part of the upper water and gas control panel, and a two-way jet cleaning device is arranged between the temperature control unit and the foam high-speed outflow device. A lower water and gas control panel is arranged at the lower part of the porous medium, a water storage tank is arranged at the lowest part of the cavity, and a drainage and pressure relief device is arranged on the outside.

2. A fusion platform for evaluating foam forming strength, deformation toughness and plugging rate according to claim 1, characterized in that: The perspective cavity shell is made of transparent PVC material, and the ratio of the transverse length to the cross-sectional width is between 1:1 and 1:

10. A scale is set on the left surface. The porous medium area is filled with a rigid medium of ceramics, bricks and tiles, saddle-shaped fillers, glass fibers, and coal blocks with a porosity of 5-30%, and the void volume of the porous medium area is determined.

3. A fusion platform for evaluating foam forming strength, deformation toughness and plugging rate according to claim 1, characterized in that: The liquid uniform distribution outflow device consists of a water supply pipe, a liquid accumulation area, an outflow pipe and a concave annular outflow device on a circular platform, wherein the bottom of the water supply pipe is lower than the upper part of the outflow pipe with a height difference of 5-20 cm, the diameter of the outflow pipe shortens from top to bottom, and the ratio of the upper and lower diameters is 1.5-3.

0.

4. A fusion platform for evaluating foam forming strength, deformation toughness and plugging rate according to claim 1, characterized in that: The movable tension and compression plate is made of PEG hydrophilic material and consists of 20-30 concave particles. The concave curve of the concave particles is approximately a parabola. A continuous groove is set in each concave particle, and the groove has a hook-shaped body. The hook-shaped body is provided with barbs. The barb angle is 0-60° with the tangent direction. The movable tension and compression plate can move laterally, moving to the left to pull the foam into shape, and moving to the right to squeeze the porous medium area.

5. A fusion platform for evaluating foam forming strength, deformation toughness and plugging rate according to claim 1, characterized in that: The water vapor control panel is made of carbon fiber material and can withstand high pressure and high temperature. A positioning echo sounder is installed at the bottom of the upper water vapor control panel to detect foam contact in real time. The acquisition frequency is 100Hz, which can realize intelligent recognition of the conversion between solid and filtrate states by the control module. The upper and lower water vapor control panels are composed of a driving mechanism, a movable baffle, a buffer spring, a pressure sensor, and a triangular support. The device driving mechanism controls the movement of the movable baffle. The pressure sensor is provided with a pressure threshold. The driving mechanism is composed of a driving gear, a driven gear, a chain, and a driving gear oil tank. The driven gear and the driving gear are connected by a chain to form a gear transmission mechanism. The driven gear is connected to the movable baffle to drive the movable baffle to move between the card slots.

6. A fusion platform for evaluating foam forming strength, deformation toughness and plugging rate according to claim 1, characterized in that: A temperature control unit is set in the middle of the porous medium, with a length accounting for 60-90% of the lateral length of the entire container. The upper limit of the heating temperature is 200°C, the lower limit is 50°C, the temperature control accuracy is within 5%, and the heating rate is controlled at 0.5-5°C / min. Six real-time temperature monitors are evenly arranged on the temperature control unit, and a total of six oxygen concentration detection devices are set at the bottom of the porous medium and in the autoclave.

7. A fusion platform for evaluating foam forming strength, deformation toughness and plugging rate according to claim 1, characterized in that: There are two bidirectional jet cleaning devices, each of which accounts for 50-60% of the horizontal length of the entire container. They are located between the central temperature control unit and the foam high-speed outflow device, with a height difference of 60 cm. They are symmetrically distributed along the central axis. The bidirectional jet cleaning device consists of a front pressurized jet port, a double-layer connecting cavity, a rear annular jet port and a liquid inlet curved hose; wherein, the front jet port is a spherical cavity composed of a drainage section, a throat section, and a jet port section, with a front-to-back ratio of 1:2; the rear annular jet port gradually shrinks along the axis, forming a trapezoidal distribution, and forming an angle of 30° with the axial direction, wherein the nozzle is located on the annular surface, with 6 nozzles distributed equidistantly in a circle; the front end of the liquid inlet curved hose is connected to the rear annular jet port cover end, and the rear end is connected to the liquid accumulation area of ​​the liquid uniform distribution outflow device, and is provided with a valve switch.

8. A fusion platform for evaluating foam forming strength, deformation toughness and plugging rate according to claim 1, characterized in that: The filtering and colorimetric gas collecting tube is located directly above the temperature control unit and is composed of a negative pressure fan, a gas-sensitive filter absorption net, and a three-phase colorimetric tube; the three-phase colorimetric tube is composed of three transparent glass tubes arranged side by side, with a tube diameter of 2.0-2.4 cm, and is respectively filled with SO2 detector, NH3 detector and NO2 detector, the SO2 detector is Nessler's reagent, the NH3 detector is plain silica gel, and the NO2 detector is aminobenzenesulfonic acid and 1-naphthylamine, and a gas-sensitive filter absorption net is installed in the middle of the tube, which can meet the HEPA standard.

9. A platform evaluation method according to claim 1, characterized in that: Including steps: S1. Arrange the platform, adjust the water vapor control panels to solid plates, set the temperature parameters of the temperature control unit of the heating element on the temperature control panel, and inject foam prepared by different foam raw materials through the foam generating device pipe; S2, the upper water and gas control plate is placed close to the porous medium area, and bubbles are injected through the foam high-speed outflow device. When the echo sounder at the lower part of the upper water and gas control plate senses bubbles, the foam production is stopped, and the volume of the foam stock solution used V2 is recorded; S3. The movable tension and compression plate is pulled to the left at a constant speed until the foam is completely detached, and the length of the foam pulled ΔL is recorded. Pressure P is applied to the autoclave through the air supply system, and the tension and compression plate moves to the right due to the pressure difference until the tension and compression plate remains stationary. The final distance ΔH moved to the right by the tension and compression plate is measured. S4, switching the upper and lower water and gas control panels to the filtrate panel state, opening the pressure relief valve to release pressure and then closing it; S5. Supply water m1 into the chamber. After time t, open the pressure relief valve to drain the water. Measure the amount of water leaking out from the bottom to the electronic balance m2. Then supply clean water again to clean the instrument. S6. Change the temperature of the heating element and the foam raw material, and repeat steps S1-S5.

10. The evaluation method according to claim 9, characterized in that: The plugging performance of the foam plugging material includes foam forming strength, spatial deformation toughness, crack plugging efficiency and foam expansion multiple at different temperatures; The foam molding strength is characterized by the pulling distance ΔL; The overall elastic deformation of the foam is calculated by the change in the left compression length ΔH, and the spatial deformation toughness of the foam is evaluated; The permeability and oxygen concentration c are calculated by the water supply m1 and the water leakage m2 to evaluate the foam plugging efficiency; The foam expansion multiple is calculated by the void volume of the porous medium area and the volume of the foam stock solution to evaluate the foam foaming performance.

Images