Stability testing device for carbon dioxide-based gel foam

Abstract

The utility model provides a carbon dioxide-based gel foam stability testing device which comprises an input device, a sealing piston plate is arranged in the input device in an up-down sliding mode, and a plurality of pressure sensors are arranged on the lower surface of the sealing piston plate; a first inlet gel foam material inlet and a second inlet connected with a carbon dioxide concentration detector probe at the inlet are formed in the top of the sealing piston plate, and a hydraulic plate is further arranged on the sealing piston plate; a first connector is formed in the bottom of the input device and connected with one end of the foam flowing pipeline, the other end of the foam flowing pipeline is connected to a second connector in the cylinder wall of the output device, and the inlet carbon dioxide concentration detector, the outlet carbon dioxide concentration detector and the pressure sensor are connected with data acquisition equipment through data lines. Different actual application environments are simulated by replacing different pipelines and setting different conveying pressures, and the performance of foam under different conditions is evaluated, so that the reliability and the accuracy of a test result are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fire prevention and extinguishing materials, and particularly relates to a stability testing device for carbon dioxide-based gel foam. BACKGROUND

[0002] With the acceleration of industrialization and the development and utilization of natural resources, China is facing the severe challenge of frequent mine goaf fires and forest fires while enjoying the economic benefits brought by the rich mineral resources and vast forest area. Forest fires are difficult to control due to their rapid spread and wide influence area; and mine goaf fires are caused by the typical semi-open and closed space characteristics, combined with the presence of combustible materials such as coal and wooden supports left in the goaf, which makes the spontaneous combustion of residual coal an important cause of frequent fires.

[0003] It has been proven that using fire prevention and extinguishing gel foam for fire prevention and control is an economical and effective method. In the prior art, gel foam is prepared by passing carbon dioxide gas into a gel containing a thiourea structure, and the stability of the gel foam is tested by measuring the size change, observing the appearance change, and detecting the change in mechanical properties of the gel foam.

[0004] However, due to the selection of different gelling agents, the stability of the prepared gel foam differs significantly, resulting in complex process and high cost during preparation. In addition, the gel foam has poor stability during transportation and storage, and is prone to rupture or gas escape. Moreover, the existing testing method for evaluating the stability of the gel foam has strong subjectivity and lacks reliable quantitative indicators. CONTENT OF THE INVENTION

[0005] The embodiments of the present application provide a stability testing device for carbon dioxide-based gel foam to solve the problems of insufficient stability of gel foam and limited application range.

[0006] The embodiments of the present application provide a stability testing device for carbon dioxide-based gel foam for testing the stability of carbon dioxide-based gel foam, comprising an input device, wherein one side of the input device is provided with a carbon dioxide concentration detector at an inlet.

[0007] A sealing piston plate is slidably arranged inside the input device, and the lower surface of the sealing piston plate is provided with a plurality of pressure sensors; a first inlet gel foam material inlet and a second inlet of the carbon dioxide concentration detector probe are formed in the top of the sealing piston plate, and a hydraulic plate is further arranged on the sealing piston plate.

[0008] The input device is provided with a first interface at the bottom, which can be controlled to open and close, and is connected with one end of the foam flow pipeline. The other end of the foam flow pipeline is connected with a second interface on the cylinder wall of the output device, and the height of the first interface is higher than that of the second interface.

[0009] A carbon dioxide concentration detector at the outlet is fixed on the cylinder wall away from the interface of the output device, and a probe of the carbon dioxide concentration detector at the outlet is arranged on the inner side of the output device.

[0010] The carbon dioxide concentration detector at the inlet, the carbon dioxide concentration detector at the outlet and the pressure sensor are respectively connected with the data acquisition equipment through data lines.

[0011] In a feasible implementation, the foam flow pipeline is provided with a flow sensor on the pipe wall near one end of the output device.

[0012] In a feasible implementation, the number of the pressure sensors is at least two.

[0013] In a feasible implementation, a support frame is arranged below the foam flow pipeline.

[0014] In a feasible implementation, the first inlet of the gel foam material is square.

[0015] In a feasible implementation, a sealing gasket is arranged between the sealing piston plate and the inner wall of the input device.

[0016] The stability test device for carbon dioxide-based gel foam provided by the embodiment of the present application can replace different pipelines and set different delivery pressures. Such flexibility enables the device to simulate different actual application environments, evaluate the performance of the foam under different conditions, and thus improve the reliability and accuracy of the test results. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a preparation flowchart of carbon dioxide-based gel foam provided by the present application;

[0018] Figure 2 is a structural schematic view of the stability test device for carbon dioxide-based gel foam;

[0019] Figure 3 is a stability test flowchart of carbon dioxide-based gel foam.

[0020] Explanation of reference signs:

[0021] 1-input device; 2-data acquisition device; 3-output device; 4-foam flow pipeline; 5-carbon dioxide concentration detector at the inlet; 6-carbon dioxide concentration detector at the outlet; 7-sealing piston plate; 8-pressure sensor; 9-flow sensor;

[0022] 11-first interface; 31-second interface; 32-outlet; 33-third inlet; 41-support frame; 71-first inlet; 72-second inlet; 73-hydraulic plate. DETAILED DESCRIPTION

[0023] In order to make the person skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0024] The current preparation method of carbon dioxide gel foam is to pass carbon dioxide gas into a gel containing thiourea structure to obtain gel foam. Due to the difference in the selection of gelling agent, the stability of different gel foams also differs, the preparation cost is high, the difficulty is great, the prepared gel foam has poor stability, and the loss is large during pipeline transportation, and the gas wrapped in the foam is easy to leak. Common stability test methods of gel foam include: measuring the size change of gel foam, observing the appearance change, detecting the change of mechanical properties, etc. These test methods have some problems, such as strong subjectivity of test results, lack of quantitative indicators, etc. Therefore, the present application aims to develop a stability test device for carbon dioxide-based gel foam, which mainly provides new materials and stability detection methods for forest and mine goaf environments.

[0025] The present application will be further described below in conjunction with the embodiments. The concentration of the embodiments is the mass percentage concentration, except for special instructions.

[0026] Embodiment 1

[0027] The present application provides a gel solution, which comprises the following components in mass percentage:

[0028] 0.2% to 1.5% of a compounded foaming agent, 0.2% to 0.8% of a compounded gelling agent, 0.3% to 1.5% of a crosslinking agent, 0.1% to 1.0% of a foam stabilizer, 0.2% to 1.0% of an auxiliary agent, and the balance of water;

[0029] The preparation method of the gel solution is as follows:

[0030] The mixture of 0.2% to 0.8% mass percentage of the compound gelling agent and the same concentration range of the foam stabilizer is mixed in a mass ratio of 1:1, ensuring that the two components are in full contact and uniformly distributed to form a base mixture.

[0031] The mixture is added to a beaker and placed in a water bath to heat until complete dissolution of the compound gelling agent and the foam stabilizer. This step helps to accelerate the dissolution process of these two components for better subsequent integration with other ingredients.

[0032] The compound foaming agent, the cross-linking agent, the auxiliary agent, and the appropriate amount of water are then added to the beaker to achieve the desired final concentration. During this process, the mixture is rapidly stirred using a stirrer until the mixture is fully foamed.

[0033] The stirring is continued until the gel foam no longer flows when the beaker is shaken, indicating that the gel has been formed. At this point, the stirring is stopped, and the gel solution is placed in an environment at 20°C for 8 hours to ensure the stability and integrity of the gel structure.

[0034] The mixture of 0.2% to 0.8% mass percentage of the compound gelling agent and the same concentration range of the foam stabilizer is mixed in a mass ratio of 1:1, ensuring that the two components are in full contact and uniformly distributed to form a base mixture.

[0035] The mixture is added to a beaker and placed in a water bath to heat until complete dissolution of the compound gelling agent and the foam stabilizer. This step helps to accelerate the dissolution process of these two components for better subsequent integration with other ingredients.

[0036] The compound foaming agent, the cross-linking agent, the auxiliary agent, and the appropriate amount of water are then added to the beaker to achieve the desired final concentration. During this process, the mixture is rapidly stirred using a stirrer until the mixture is fully foamed.

[0037] The stirring is continued until the gel foam no longer flows when the beaker is shaken, indicating that the gel has been formed. At this point, the stirring is stopped, and the gel solution is placed in an environment at 20°C for 8 hours to ensure the stability and integrity of the gel structure.

[0038] Example 2

[0039] As shown in Example 1, the compound foaming agent includes 0.2% to 1.5% mass percentage of sodium dodecyl sulfate for reducing the surface tension of water and 0.2% to 1.5% mass percentage of fatty alcohol polyoxyethylene ether 9 for good wettability and dispersibility. Preferably, the mass percentage of sodium dodecyl sulfate is 0.8%, and the mass percentage of fatty alcohol polyoxyethylene ether 9 is 0.8%.

[0040] In the embodiments of the present application, sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether 9 can produce rich and delicate foam together. The use of the two substances not only can form stable foam, but also can improve the overall stability of the gel solution, and can maintain good condition even during storage and transportation.

[0041] Example 3

[0042] As shown in Example 1, the complex gelling agent includes 0.2% to 0.8% by mass percentage of dimethicone and 0.2% to 0.8% by mass percentage of sodium carboxymethyl cellulose, preferably, the mass percentage of dimethicone is 0.5%, and the mass percentage of sodium carboxymethyl cellulose is 0.5%. Dimethicone has very low surface tension, excellent lubricity and softness, which helps to form a soft and smooth gel structure; sodium carboxymethyl cellulose has good thickening and suspending properties. As a gelling agent, sodium carboxymethyl cellulose can form a network structure in water, enhance the stability and viscosity of the gel, and make the gel have good water holding capacity and form retention capacity.

[0043] In the embodiments of the present application, the addition of dimethicone makes the gel have a silky texture, and the presence of sodium carboxymethyl cellulose enhances the structural stability of the gel, so that the gel can still maintain its original form after a long time. The thickening effect of sodium carboxymethyl cellulose plus the low surface tension characteristics of dimethicone make the gel have good water holding performance and are not easy to dry.

[0044] Example 4

[0045] As shown in Example 1, the crosslinking agent includes 0.3% to 1.5% by mass percentage of polyethylene polyamine or 0.3% to 1.5% by mass percentage of trimethylolpropane, preferably, the mass percentage of polyethylene polyamine or trimethylolpropane is 0.5%. Polyethylene polyamine has strong crosslinking ability. As a crosslinking agent, polyethylene polyamine can promote the crosslinking between molecules in the gel, enhance the adhesion and elasticity of the gel, and improve its mechanical strength and stability. Trimethylolpropane can react with other components in the gel through its hydroxyl groups to form a three-dimensional network structure, thereby enhancing the structural strength and durability of the gel.

[0046] In the embodiments of the present application, whether it is polyethylene polyamine or trimethylolpropane, it can enhance the mechanical strength of the gel by promoting intermolecular crosslinking, so that the gel is not easy to break or deform during use. The presence of the crosslinking agent makes the structure of the gel more compact and not easy to be affected by external environmental factors such as temperature changes. Appropriate crosslinking degree can give the gel better elasticity and toughness. Since the crosslinking agent can enhance the structural stability of the gel, it can prolong the service life of the gel product and reduce product failure due to structural failure.

[0047] Example 5

[0048] As shown in Example 1, the foam stabilizer includes 0.2% to 0.8% by mass of sodium carboxymethyl cellulose or 0.2% to 0.8% by mass of Tween series, preferably, the mass percentage of sodium carboxymethyl cellulose or Tween series is 0.5%. Sodium carboxymethyl cellulose has good thickening and suspending properties. As a foam stabilizer, sodium carboxymethyl cellulose can form a protective layer between the foam films by its viscous properties, thereby enhancing the stability of the foam and preventing the foam from breaking prematurely. Tween series can reduce the surface tension of water, promote the formation of foam, and stabilize the foam by its surface active properties to prevent the foam film from breaking.

[0049] In the embodiments of the present application, whether it is sodium carboxymethyl cellulose or Tween series, it can significantly improve the stability of the foam, so that the foam remains unbroken for a long time.

[0050] Example 6

[0051] As shown in Example 1, the auxiliary agent includes sodium hydroxide, sodium carbonate or calcium carbonate, preferably, the mass percentage of sodium hydroxide, sodium carbonate or calcium carbonate is 0.3%. Sodium hydroxide is commonly used to adjust the pH value. In the gel solution, NaOH can be used to adjust the pH value of the system to the desired range, thereby affecting the effectiveness of other components, such as enhancing the detergency of the surfactant or improving the stability of the gel. Sodium carbonate can also be used to adjust the pH value and has a certain buffering effect. In addition to adjusting the pH value, sodium carbonate can also act as a buffer to help maintain the pH stability of the gel solution, avoiding large fluctuations in the pH value due to external factors. Calcium carbonate has good stability. Calcium carbonate mainly acts as a filler in the gel, which can increase the consistency and touch of the gel, and also helps to improve the mechanical strength of the gel.

[0052] In the embodiments of the present application, whether it is sodium hydroxide or sodium carbonate, it can effectively adjust the pH value of the gel solution to ensure that other components function under optimal conditions. The buffering effect of sodium carbonate helps to maintain the pH stability of the gel, which is very important for the long-term preservation of the gel solution. As a filler, calcium carbonate helps to improve the mechanical strength of the gel, making it more robust and durable, and enhances the stability of the foam and the strength of the foam film in the gel solution.

[0053] Example 7

[0054] As shown in Example 1, the preparation method of the complex foaming agent is as follows:

[0055] The Waring Blender method is used to measure the foaming effect of various foaming agents, including but not limited to sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium alpha-olefin sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, sodium secondary alkyl sulfonate, dioctyl sodium sulfosuccinate, cetyltrimethylammonium bromide, cetyltrimethylammonium chloride, cocamidopropyl betaine, disodium lauroamphodipropionate, lauramidopropyl betaine, lauramidopropyl ammonium oxide, fatty alcohol polyoxyethylene ether 9, lauryl glucoside, octylphenol polyoxyethylene ether, and nonylphenol polyoxyethylene ether;

[0056] The stirring speed of the stirrer is set to 1500 r / min, the stirring time is 2 minutes, and the foam volume and the separated liquid volume in the container are immediately read after the stirring is completed, and the foam volume is used to represent the foaming effect of the foaming agent;

[0057] The foaming performance of the various foaming agents is tested and the foaming effect is ranked, and the three foaming agents with the best foaming effect are screened out;

[0058] The three best foaming agents screened out are tested in pairs to obtain three compounded foaming agents, and the foaming test of the compounded foaming agents is carried out, the stirring speed of the stirrer is set to 1500 r / min, the stirring time is 2 minutes, and the foam volume and the separated liquid volume in the container are immediately read after the stirring is completed, and the foam volume is used to represent the foaming effect of the compounded foaming agent;

[0059] Finally, sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether 9 are determined as the foaming agents used in the experiment, wherein the amount of sodium dodecyl sulfate is 0.2% to 1.5% by mass percentage, and the amount of fatty alcohol polyoxyethylene ether 9 is 0.2% to 1.5% by mass percentage;

[0060] When the foaming agent is tested, the use amount and concentration of all foaming agents are the same.

[0061] Example 8

[0062] The embodiments of the present application provide a carbon dioxide-based gel foam, which is prepared by introducing carbon dioxide gas into the gel solution of any one of examples 1-7.

[0063] In the embodiments of the present application, a large number of micro-bubbles are formed in the gel solution by introducing carbon dioxide gas, so that the finally formed gel foam has a low density. The light weight makes this gel foam very suitable for applications that require weight reduction. The gel solution contains a foam stabilizer, which can form a stable foam structure after the introduction of carbon dioxide gas. The stable foam structure means that it is not easy to collapse or deform during use, and can maintain for a long time. The presence of carbon dioxide bubbles makes the gel foam have certain heat preservation and insulation performance.

[0064] Example 9

[0065] Referring to Figure 1 As shown in the embodiment of the present application, a preparation method of carbon dioxide-based gel foam is provided, comprising:

[0066] After the gel solution components of any one of embodiments 1-7 are stirred uniformly, they are placed in an environment of 20-25°C for 6-8 hours;

[0067] Carbon dioxide solution is introduced into the above gel solution at a gas-liquid volume ratio of 150:1 or 150:2, and the carbon dioxide gas is continuously introduced while stirring. The reaction is carried out at a temperature of 70-80°C for 48 hours to obtain carbon dioxide gel foam. The gas-liquid volume ratio mentioned here refers to the ratio of the volume of carbon dioxide gas introduced to the volume of gel solution. Continuous stirring is required during the introduction of carbon dioxide gas to ensure that the gas is uniformly dispersed in the gel solution to form a stable foam structure. A temperature range of 70-80°C helps to promote the interaction of the components in the gel solution to form a stable foam structure. A constant temperature is required during the reaction to ensure consistency of the reaction conditions.

[0068] Example 10

[0069] Referring to Figure 2 As shown in the embodiment of the present application, a stability testing device for carbon dioxide-based gel foam is provided, which is used to test the stability of the carbon dioxide-based gel foam described in embodiment 8. The device includes an input device 1, which is provided with a carbon dioxide concentration detector 5 at the inlet on one side. The carbon dioxide concentration detector 5 can monitor the carbon dioxide concentration entering the device in real time, ensuring consistency and accuracy of the test conditions.

[0070] A sealing piston plate 7 is arranged inside the input device 1 by sliding up and down, and the lower surface of the sealing piston plate 7 is provided with a plurality of pressure sensors 8. A sealing washer is arranged between the sealing piston plate 7 and the inner wall of the input device 1 to ensure air tightness during the test and prevent carbon dioxide leakage. A first inlet 71 for gel foam material is provided at the top of the sealing piston plate 7, and a second inlet 72 for the probe of the carbon dioxide concentration detector 5 at the inlet is also provided. A hydraulic plate 73 is also provided on the sealing piston plate 7. Preferably, the gel foam material inlet 71 is square with a side length of 100 mm.

[0071] The sealing piston plate 7 is used to control the amount of gel foam material entering, and the pressure change below the sealing piston plate is monitored by the pressure sensor 8, so as to indirectly understand the state of the gel foam. The hydraulic plate 73 drives the sealing piston plate 7 to move up and down, so as to control the feeding amount of the gel foam material. The pressure sensor 8 detects the pressure change of the gel foam under pressure, which helps to evaluate its physical performance. The square gel foam material inlet design facilitates the standardization of sample size, ensuring the comparability of test results. The bottom of the input device 1 is provided with a first interface 11 which can be controlled to open and close, and is connected to one end of the foam flow pipeline 4. The other end of the foam flow pipeline 4 is connected to the second interface 31 on the barrel wall of the output device 3, and the height of the first interface 11 is higher than that of the second interface 31. Preferably, the height difference between the first interface 11 and the second interface is 100 mm. The design of such height difference helps the smooth flow of foam under the action of gravity, reduces the flow resistance, and at the same time is also conducive to observing the change of flowability of foam under different conditions.

[0072] The outlet carbon dioxide concentration detector 6 is fixed on the barrel wall away from the second interface 31 of the output device 3, and the probe of the outlet carbon dioxide concentration detector 6 is arranged on the inside of the output device 3. The outlet carbon dioxide concentration detector 6 can monitor the change of carbon dioxide concentration of the foam after passing through the whole test process, so as to evaluate the stability of the gel foam.

[0073] The inlet carbon dioxide concentration detector 5, the outlet carbon dioxide concentration detector 6 and the pressure sensor 8 are respectively connected to the data acquisition equipment 2 through data lines. The data acquisition equipment 2 can collect and record the changes of various parameters in the test process in real time, providing a basis for subsequent data analysis.

[0074] In the embodiment of the application, by monitoring the carbon dioxide concentration and pressure change in real time, the test conditions can be accurately controlled, and the accuracy and reliability of the test results can be ensured. Through the data acquisition equipment 2, various key data about the gel foam stability test can be collected, providing detailed information support for analyzing the performance of the gel foam. Through the comparison of the changes of carbon dioxide concentrations at the inlet and outlet, the stability of the gel foam can be directly reflected, which is convenient for quickly judging the quality of the gel foam. The device is designed reasonably, and the operation process is simple and clear, which reduces the operation difficulty and improves the test efficiency. The stability test device helps to comprehensively evaluate the performance of the carbon dioxide-based gel foam, and ensures its reliability and effectiveness in practical application.

[0075] Example 11

[0076] Reference Figure 2As shown in Example 10, the foam flow pipeline 4 is provided with a flow sensor 9 near the wall of the end of the output device 3. The flow sensor 9 is installed at the end of the foam flow pipeline 4 near the input device 1, and monitors the gel foam flow through the pipeline in real time.

[0077] The flow sensor 9 in the embodiment of the application can accurately measure the flow of the foam. By monitoring the change in flow, the loss of the foam after transmission over a certain distance can be evaluated, and the stability of the foam can be judged.

[0078] Example 12

[0079] Referring to Figure 2 As shown in Example 10, the number of pressure sensors 8 is at least two, which are used to monitor the pressure changes of the gel foam at different positions.

[0080] In the embodiment of the application, by providing multiple pressure sensors, the pressure distribution of the gel foam during the test process can be more comprehensively understood, so that the stability and structural strength of the foam can be better evaluated. Multiple sensors can provide more accurate pressure data.

[0081] Example 13

[0082] Referring to Figure 2 As shown in Example 10, the material of the foam flow pipeline 4 is polyethylene, which has good chemical stability and mechanical strength, and strong corrosion resistance. A support frame 41 is provided below the foam flow pipeline for fixing and supporting the pipeline. Preferably, the radius of the foam flow pipeline 4 is 50 mm, and the length of the foam flow pipeline 4 is 500 mm. A larger radius and a moderate length can ensure that the foam has enough space to expand during the flow process, and the flow resistance in the pipeline is relatively small, which is conducive to the stable transmission and testing of the foam.

[0083] In the embodiment of the application, by using a pipeline made of polyethylene material and suitable size design, the flow state of the foam during the test process can truly reflect its performance, thereby improving the accuracy of the test results. The design of the support frame 41 makes the test device more stable, and the operation during the test can be more convenient, reducing the errors caused by unstable equipment. The pipeline made of polyethylene material is easy to clean and maintain, reducing the workload of device maintenance and prolonging the service life of the device.

[0084] Example 14

[0085] Referring to Figure 3 As shown, the embodiment of the application provides a method for testing the stability of a carbon dioxide-based gel foam, which comprises the following steps:

[0086] Open the gel foam material inlet on the sealing piston plate to ensure that the gel foam can enter the test device smoothly. The carbon dioxide-based gel foam prepared in Example 8 is continuously injected into the input device through the gel foam material inlet, the probe of the carbon dioxide concentration detector is inserted into the input device through the inlet, the carbon dioxide concentration in the input device is monitored in real time, the carbon dioxide gas concentration Q1 in the input device is tested and recorded, and baseline data is provided for comparison with the concentration after the gel foam enters;

[0087] Continue to inject the prepared carbon dioxide-based gel foam into the first inlet gel foam material inlet, and wait for the carbon dioxide-based gel foam to be evenly distributed in the input device. The carbon dioxide gas concentration Q2 in the input device is tested and recorded.

[0088] Open the first interface at the bottom of the input device, close the gel foam material inlet, and pressurize the hydraulic plate on the sealing piston plate with an external oil pump to move the sealing piston plate down to 3 / 4 of the height of the input device. Record the position of the sealing piston plate and the reading p1 of the pressure sensor at this time. After the gel foam is evenly spread on the output device, the carbon dioxide gas concentration Q3 in the output device is tested and recorded. Q3-Q1=Q4 can represent the amount of carbon dioxide gas leakage wrapped by the bubbles;

[0089] Measure and record the accumulation height h1 of the carbon dioxide-based gel foam in the output device;

[0090] By comparing the carbon dioxide gas concentration Q2 in the input device and the carbon dioxide gas concentration Q3 in the output device under stable conditions;

[0091] By comparing the accumulation height h1 of the carbon dioxide-based gel foam in the output device and the height of the carbon dioxide-based gel foam in the input device under stable conditions;

[0092] Calculate the difference rate of the carbon dioxide gas concentration Q2 in the input device and the carbon dioxide gas concentration Q3 in the output device. The greater the difference, the worse the stability of the foam and the more serious the rupture and fusion;

[0093] Record the carbon dioxide gas concentration difference rate in the input device and the carbon dioxide gas concentration difference rate in the output device under different pressures applied by the external oil pump;

[0094] Under the same temperature and other environmental conditions, after experiencing the same number of pressurizations and pressurization pressures, compare the carbon dioxide concentration difference rates of the input device and the output device of carbon dioxide-based gel foams with different component proportions;

[0095] Under the same temperature and environmental conditions, the carbon dioxide concentration difference rate of the input device and the output device of the carbon dioxide-based gel foam with the same component ratio is compared after experiencing different pressurization times and pressurization pressures. In the embodiments of the present application, the stability, flowability and structural strength of the gel foam are comprehensively evaluated by recording the carbon dioxide concentration and the gel foam accumulation height under different conditions. By monitoring and recording the changes of various parameters in real time, the accuracy and repeatability of the test results are ensured. Based on the test results, the formulation and production process of the gel foam can be optimized to improve its stability and other performance indicators. By simulating different pressurization conditions, the performance of the gel foam under different conditions can be better simulated, which helps to comprehensively evaluate the performance of the carbon dioxide-based gel foam.

[0096] According to the above technical features, the working principle of the preparation and stability test method of the carbon dioxide-based gel foam provided by the present application in the actual application scene is:

[0097] First, prepare a gel solution according to any of the gel solution formulations in embodiments 1-7, which includes complex foaming agents, complex gelling agents, cross-linking agents, foam stabilizers, and other ingredients. Place the above-mentioned gel solution in a reaction container and, while stirring, introduce carbon dioxide gas into the gel solution at a gas-liquid volume ratio of 150:1 or 150:2 and simultaneously add a carbon dioxide solution. The stirring and aeration process is to ensure that the carbon dioxide gas can be uniformly dispersed in the gel solution to form a stable foam structure. Under the condition of 70-80℃, the gel solution reacts with carbon dioxide gas for 48 hours. By appropriate temperature and time conditions, the chemical reaction between the components in the gel solution is promoted to form a stable foam structure.

[0098] The prepared carbon dioxide-based gel foam is continuously fed into the input device through the gel foam material inlet, and the probe of the carbon dioxide concentration detector is inserted into the input device. The gel foam material inlet on the sealing piston plate is opened, and the carbon dioxide gas concentration Q1 in the input device is recorded. The gel foam is continuously injected into the input device until it is uniformly distributed in the input device, and the carbon dioxide gas concentration Q2 at this time is recorded. The gel foam material inlet is closed, the first interface at the bottom of the input device is opened, and the hydraulic plate on the sealing piston plate is pressurized using an external oil pump, so that the sealing piston plate moves downward to 3 / 4 of the height of the input device, and the pressure sensor reading p1 at this time is recorded. After the gel foam is uniformly spread on the output device, the carbon dioxide gas concentration Q3 in the output device is recorded. The accumulation height h1 of the gel foam in the output device is measured and recorded. By comparing the carbon dioxide gas concentration Q2 in the input device and the carbon dioxide gas concentration Q3 in the output device under stable state, the concentration difference rate is calculated; by comparing the accumulation height of the gel foam in the input device and the output device, the stability of the foam is evaluated. Under the same temperature and other environmental conditions, after experiencing the same number of pressurizations and pressurization pressures, the carbon dioxide concentration difference rates of the input device and the output device of carbon dioxide-based gel foams with different component proportions are compared. Under the same temperature and other environmental conditions, after experiencing different numbers of pressurizations and pressurization pressures, the carbon dioxide concentration difference rates of the input device and the output device of carbon dioxide-based gel foams with the same component proportion are compared.

[0099] It is easy to understand that, based on the several embodiments provided in the present application, the skilled in the art can combine, split, recombine, etc. the embodiments of the present application to obtain other embodiments, and these embodiments do not exceed the protection scope of the present application.

[0100] The above specific embodiments further detail the purposes, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above is only a specific embodiment of the present application, and is not intended to limit the protection scope of the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A stability testing device for carbon dioxide-based gel foams, characterized by, Including input device (1), one side of the input device (1) is provided with inlet carbon dioxide concentration detector (5); The sealing piston plate (7) is arranged inside the input device (1) and slides up and down, and the lower surface of the sealing piston plate (7) is provided with a plurality of pressure sensors; The top of the sealing piston plate (7) is provided with a first inlet (71) for gel foam material and a second inlet (72) connected with the probe of the inlet carbon dioxide concentration detector (5), and the sealing piston plate (7) is further provided with a hydraulic plate (73); The bottom of the input device (1) is provided with a first interface (11) which can be controlled to open and close, connected with one end of the foam flow pipeline (4), the other end of the foam flow pipeline (4) is connected to the second interface (31) on the cylinder wall of the output device (3), and the height of the first interface (11) is higher than that of the second interface (31); The output device (3) is fixed with an outlet carbon dioxide concentration detector (6) on the side of the cylinder wall away from the second interface (31), and the probe of the outlet carbon dioxide concentration detector (6) is arranged on the inside of the output device (3); The inlet carbon dioxide concentration detector (5), the outlet carbon dioxide concentration detector (6) and the pressure sensor (8) are respectively connected with the data acquisition device (2) through data lines.

2. The stability test device for carbon dioxide-based gel foams according to claim 1, characterized in that, The foam flow pipeline (4) is provided with a flow sensor (9) on the wall near one end of the output device (3).

3. The stability test device for carbon dioxide-based gel foams according to claim 1, characterized in that, The number of pressure sensors (8) is at least two.

4. The stability test device for carbon dioxide-based gel foams according to claim 1, characterized in that, The foam flow pipeline (4) is provided with a support frame (41) below.

5. The stability test device for carbon dioxide-based gel foams according to claim 1, characterized in that, The first inlet (71) for gel foam material is square.

6. The stability test device for carbon dioxide-based gel foams according to claim 1, characterized in that, The sealing gasket is arranged between the sealing piston plate (7) and the inner wall of the input device (1).

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