Optimal sealing control method for foaming gas and preparation method of foamed lightweight soil

Abstract

The present invention discloses an optimal sealing control method for foaming gas and a method for preparing foamed lightweight soil. By controlling the settlement distance to meet the requirements, a dynamic relationship curve is used to give the upper limit range and maximum value of the surface tension in a pure foam system, which is input into a single-chip computer and set as a dynamic change upper limit and displayed on the screen. The type of foaming agent, the type and proportion of gas, the type and proportion of lightweight soil aggregate are adjusted, and the dynamic surface tension of the fluid lightweight soil system is measured in a closed air pressure chamber using a sensor. By controlling a single variable, the mixing ratio of the target gas is changed, the dynamic surface tension is measured online and controlled using the upper limit to obtain the optimal solution. The present invention ensures the maximization of the optimal sealing amount in the foam concrete material, avoids the insufficient amount of foam caused by excessive mixing and the waste of surplus caused by too small mixing. It has good social and economic benefits.

Description

Technical Field

[0001] The invention relates to an optimal sealing control method for foaming gas and a method for preparing foamed lightweight soil, belonging to the technical field of building materials. Background Art

[0002] Foamed lightweight soil is a cement-based lightweight material with numerous closed pores. This material is mechanically foamed with a foaming agent solution, uniformly mixed with cement slurry, and then pumped to the site for pouring or molding. It then undergoes natural or steam curing. Foamed lightweight soil is an inorganic material with excellent fire resistance, sound insulation, and ease of construction. It is widely used for thermal insulation and soundproofing in roofs and walls.

[0003] Currently, the technology for preparing lightweight foam soils has matured and is effective at storing anhydrous and slightly hydrated gases, such as air. However, further development has been made in terms of the diversity of filler gases. Due to industrial development, greenhouse gases such as CO2 and other pollutants are widely emitted, leading to increasingly severe global pollution and the greenhouse effect. To address the global greenhouse effect, China has proposed green and low-carbon carbon peak and carbon neutrality requirements. To respond to the call of the state and society, considering the introduction of greenhouse gases such as CO2 as filler gases in the preparation of lightweight foam soils, and ultimately sealing them through structural molding, ultimately forming a new type of green and low-carbon material.

[0004] Therefore, how to design a device that can determine the maximum harmful gas absorption ratio and absorption amount based on different lightweight soil aggregates and foaming agents, so as to maximize the absorption of harmful gases in actual projects, has become a technical problem that needs to be solved in the design of new foamed concrete materials with low pollution and low carbon requirements. Summary of the Invention

[0005] Purpose: To overcome the deficiencies in the prior art, the present invention provides an optimal sealing and control method for foaming gas and a method for preparing foamed lightweight soil.

[0006] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is:

[0007] In a first aspect, a method for optimal sealing and controlling foaming gas specifically comprises:

[0008] Step 1: Obtain mixed gases prepared according to target gases with different ratios, and prepare different pure foam systems according to different mixed gases.

[0009] Step 2: Record the settlement distances of different pure foam systems per unit time, select the pure foam systems whose settlement distance distribution difference is less than the first threshold, then select the maximum settlement distance of each selected pure foam system, select the final maximum settlement distance among each maximum settlement distance that meets the settlement distance specification and is the maximum value, and select the pure foam system corresponding to the final maximum settlement distance.

[0010] Step 3: Based on the pure foam system corresponding to the final maximum settlement distance, calculate the upper limit range of the settlement distance per unit time.

[0011] Step 4: Measure the real-time dynamic surface tension and sedimentation distance of the pure foam system corresponding to the final maximum sedimentation distance, and deduce the surface tension and sedimentation distance model of the pure foam system based on the real-time dynamic surface tension and sedimentation distance.

[0012] Step 5: Calculate the surface tension limit of the pure foam system based on the upper limit value range of the settling distance per unit time and the surface tension and settling distance model of the pure foam system.

[0013] Step 6: Prepare a new mixed gas including the target gas, prepare a fluidized light soil system based on the new mixed gas, and measure the surface tension of the fluidized light soil system in real time.

[0014] Step 7: Compare the surface tension of the fluidized lightweight soil system measured in real time with the surface tension limit value of the pure foam system. When the surface tension of the fluidized lightweight soil system measured in real time is less than the surface tension limit value of the pure foam system, increase the proportion of the target gas in the new mixed gas. When the difference between the surface tension of the fluidized lightweight soil system measured in real time and the surface tension limit value of the pure foam system meets the second threshold value, output the ratio of the target gas in the new mixed gas.

[0015] Furthermore, step 3 specifically includes:

[0016] Step 3.1: Prepare n groups of standard lightweight soil test blocks according to the pure foam system corresponding to the final maximum settlement distance and carry out standard curing.

[0017] Step 3.2: Take each group of test blocks after curing , weighing mass , calculate the density , take the maximum settlement distance in the test block with density distribution difference less than the third threshold as the right boundary value b of the upper limit value range.

[0018] Step 3.3: Cut each group of test blocks after curing , do standard compression test, after the test, calculate the density again , take the settlement distance of the maximum density test block as the left boundary value a of the upper limit value range.

[0019] Step 3.4: Based on the right boundary value b and the left boundary value a, obtain the upper limit range of the settlement distance per unit time (a, b).

[0020] Furthermore, the surface tension and sedimentation distance model expressions of the pure foam system are as follows:

[0021]

[0022] in, 、 are the model coefficients, is the settling distance of the pure foam system, It is the calculated value of surface tension of pure foam system.

[0023] Furthermore, the step 5 specifically includes:

[0024] Step 5.1: Obtain the left boundary value a of the upper limit of the settling distance per unit time, and substitute the left boundary value a into the surface tension and settling distance model of the pure foam system to obtain the surface tension per unit time .

[0025] Step 5.2: Obtain the right boundary value b of the upper limit of the settling distance per unit time, and substitute the right boundary value b into the surface tension and settling distance model of the pure foam system to obtain the surface tension per unit time .

[0026] Step 5.3: Surface tension per unit time , surface tension per unit time , construct the feasible domain of pure foam system, the expression of the feasible domain of pure foam system is as follows:

[0027]

[0028] in, is the surface tension of fluid lightweight soil slurry or pure foam at time t.

[0029] Step 5.4: Based on the feasible region of the pure foam system, calculate the surface tension limit value per unit time of the pure foam system. The expression of the surface tension limit value of the pure foam system is as follows:

[0030] like ,but:

[0031]

[0032] like ,but:

[0033]

[0034] in, is the surface tension limit of the pure foam system, is the fourth threshold.

[0035] Furthermore, the target gas is a reactive gas or a non-reactive gas.

[0036] Furthermore, the first threshold is set to 5 mm.

[0037] Furthermore, the third threshold is set to 5%.

[0038] Furthermore, the fourth threshold is set to 5%.

[0039] In a second aspect, a method for preparing foamed lightweight soil comprises: obtaining the ratio of target gas in the mixed gas according to an optimal sealing control method of foaming gas in the first aspect, and preparing the mixed gas according to the ratio of target gas in the mixed gas.

[0040] Beneficial effect: The present invention provides an optimal sealing control method for foaming gas and a method for preparing foamed lightweight soil. Based on different types of foaming agents, different types and proportions of gases, a sensor is used to measure the real-time settlement distance of the pure foam system in a closed air pressure chamber. and dynamic surface tension , input the microcontroller to reverse calculate and display the dynamic relationship curve. By controlling the settlement distance to meet the requirements, the dynamic relationship curve is used to give the upper limit range and maximum value of the surface tension of the pure foam system. The input is set to the dynamic change upper limit of the microcontroller and displayed on the screen. Adjust the foaming agent type, gas type and ratio, lightweight soil aggregate type and ratio, and use the sensor to measure the dynamic surface tension of the fluid lightweight soil system in a closed air pressure chamber. By controlling a single variable, changing the target gas ratio, measuring the dynamic surface tension online and controlling it with an upper limit, the optimal solution is obtained.

[0041] Compared with the prior art, the present invention has the following technical effects:

[0042] 1. New green foam lightweight soil material. Compared with the traditional air filling method, a certain proportion of target sealed gas is introduced to mix with air to form a new foam filling gas. Under the premise of ensuring the quality requirements of foam lightweight soil, a new type of foam lightweight soil material can be obtained.

[0043] 2. Environmental protection and green and low-carbon development. CO2 and other harmful gases are greenhouse gases and pollutants. Absorbing and storing pollutants and greenhouse gases from the atmosphere is in line with the environmental protection concept of environmental protection and green and low-carbon development, and it takes into account the dual requirements of building materials, green and low-carbon development, and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1This is a structural schematic diagram of an optimal sealing control system for foaming gas according to the present invention.

[0045] Figure 2 The figure is a flow chart of an optimal sealing control method for foaming gas according to the present invention.

[0046] Figure 3 This is a schematic structural diagram of an optimal sealing control device for foaming gas according to the present invention.

[0047] Figure 4 This is a flow chart of an optimal storage control method for a foaming gas using CO2 as an example according to the present invention. DETAILED DESCRIPTION

[0048] The following is a clear and complete description of the technical solutions in the examples of the present invention, in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0049] The present invention will be further described below with reference to specific embodiments.

[0050] Example 1:

[0051] This embodiment introduces an optimal sealing control system for foaming gas. Figure 1 As shown, it includes: a spiral mixer 1, a mechanical foaming machine 2, a first measuring instrument 3, a second measuring instrument 4, a controller 5 and a display 6.

[0052] The spiral mixer 1 includes a first feed port 101, a second feed port 102, and a first inspection port 103. The spiral mixer 1 is used for mixing foamed lightweight soil. The first feed port 101 is used to input aggregate and foaming agent solution, the second feed port 102 is used to input mixed gas, and the first inspection port 103 is used to send fluidized lightweight soil.

[0053] The mechanical foaming machine 2 includes a third feed port 201, a fourth feed port 202, and a second inspection port 203. The mechanical foaming machine 2 is used to stir the foaming agent. The third feed port 201 is used to input the foaming agent solution, the fourth feed port 202 is used to input the mixed gas, and the second inspection port 203 is used to emit pure foam.

[0054] The first measuring instrument 3 is used to measure the surface tension of fluid lightweight soil in real time.

[0055] The second measuring instrument 4 is used to measure the surface tension of pure foam and the sedimentation distance in real time.

[0056] The controller 5 includes a first single-chip microcomputer and a second single-chip microcomputer. The first single-chip microcomputer is used to construct a relationship curve based on the real-time measured surface tension of fluid lightweight soil. The second single-chip microcomputer is used to construct a relationship curve based on the real-time measured surface tension of pure foam and settlement distance.

[0057] The display 6 is used to display the actual surface tension, the dynamic change amount of the sedimentation distance indicator, the change curve and the duration.

[0058] Example 2:

[0059] This embodiment introduces an optimal sealing control method for foaming gas, such as Figure 2 As shown, specifically including:

[0060] S1: Determine the parameter index according to the engineering requirements of foam formation stability; the parameter index is: dynamic surface tension of foam in fluid light soil system , Dynamic surface tension of pure foam system And the corresponding settlement distance .

[0061] S2: Determine the upper limit range of the target gas's settling distance per unit time, which are the upper limit range of the target gas's settling distance per unit time (1h) for a pure foam system of a reactive gas (9.5mm, 10mm) and the upper limit range of the target gas's settling distance per unit time (1h) for a pure foam system of a non-reactive gas (19.5mm, 20mm).

[0062] S3: Based on the pure foam stability index parameters, the dynamic surface tension of the pure foam system is measured online. And the corresponding settlement distance The parameter values ​​are stored in the single chip computer for quantitative relationship design and programming, and the real-time dynamic settlement distance within unit time (1h) is deduced. Curves and surface tension Curve, delineate the feasible region of pure foam system, and determine the limit value based on the feasible region of pure foam system As .

[0063] S4: Based on the defined feasible region, real-time monitoring of the same type of foaming agent and target gas fluidized light soil system is performed to obtain the dynamic surface tension value of the foam per unit time (1h) of the fluidized light soil system under normal conditions. .

[0064] S5: Determine the Is it greater than , obtain the ratio of target gas in the mixed gas.

[0065] Furthermore, the pure foam system solution index limit and detection:

[0066] 1) Settling distance limit of pure foam solution per unit time (1h):

[0067] Compared to target gases like air, which have no direct reaction, some gases that react directly with the foaming agent solution and lightweight soil aggregate will undergo chemical reactions during foaming, causing changes in the amount of foam and the composition of the lightweight soil aggregate. Therefore, it is necessary to prepare multiple sets of lightweight soil standard test blocks indoors to test their density and compressive strength. The specific steps are as follows:

[0068] S11. Using a single variable control method, prepare in the laboratory a mixture of different types of target gases (including air) with a ratio difference of 10%. Add the same foaming agent to each mixed gas according to the different composition of the target gases to prepare three groups of pure foams. Calculate the settling distance of the pure foam per unit time (1 hour).

[0069] S12. Select pure foam mixes with settlement distribution differences within 5 mm. Then, select the maximum settlement of each selected pure foam system. Select the final maximum settlement that meets the maximum settlement specification and is less than the maximum. Select the pure foam system corresponding to the final maximum settlement. Then, prepare n groups of standard lightweight soil test blocks using the same aggregate (mark them 1<…< <…n), and standard curing for 28 days.

[0070] S13. Take each group of test blocks after curing , weighing mass , calculate the density , take the maximum settlement distance of the test blocks with density distribution difference less than 5% as the right boundary value of the upper limit value range. And intercept all the above test blocks.

[0071] S14. Take the test piece and perform the standard compression test on it. According to the specification requirement of 28d compressive strength ≥ 0.8MPa, weigh the mass. , calculate the density , and obtain the settlement distance of the maximum density test block as the left boundary value of the upper limit value range.

[0072] S15. Based on the results of S13 and S14, the upper limit value ranges of the settlement distance of the pure foam system corresponding to different types and different mixing ratios of target gases are given as (9.5mm, 10mm) and (19.5mm, 20mm).

[0073] 2) Surface tension test of pure foam system solution per unit time (1h):

[0074] Using sensor chips, the sedimentation distance of foam solution in closed container is continuously measured online. and surface tension The measured data is stored in the microcontroller and the real-time ~ Relationship curve, based on the relationship curve and the set range of settlement distance, the feasible region and the extreme value of surface tension are defined.

[0075] described ~ The mathematical quantitative relationship is:

[0076] ) The target gas selected is a gas without direct reaction:

[0077]

[0078]

[0079] ) The target gas selected is the direct reaction gas:

[0080]

[0081]

[0082] in, is the surface tension of water, is the surface tension of the fluid lightweight soil slurry or pure foam at time t, The surface tension of the fluid light soil slurry or foam is the smallest value at the initial stage of the reaction. is a constant coefficient, is the settlement distance. It is the maximum surface tension within a unit (1h) of the pure foam system. It is a fluid light soil slurry or pure foam in the settlement distance The corresponding surface tension.

[0083] The feasible domain and surface tension extremes of the pure foam system corresponding to the reactive gas and the non-reactive gas are:

[0084]

[0085]

[0086] like ,but:

[0087]

[0088] like ,but:

[0089]

[0090] in, It is the peak surface tension of a single foam in the same system when the settlement distance within 1 hour is no more than 10 mm and 20 mm.

[0091] Further, fluid foam lightweight soil detection and control:

[0092] By setting the limit of the sedimentation distance of the pure foam system, the upper limit of the surface tension of the foam solution was obtained. , enter the upper limit value into the microcontroller memory.

[0093] S21. Based on a specific target gas, a mixed gas is formed by adjusting the ratio of the gas to air, changing the amount of target gas sealed in the lightweight soil, and continuously observing the bubble stability.

[0094] S22. Use an online surface tension meter to measure the surface tension of the filtrate of the fluidized light soil online. , the microcontroller stores and displays the change value ( 、 、 ……… ).

[0095] S23. Using the upper limit value set by the single chip computer, according to the real-time surface tension of the fluid light soil , according to the method of controlling a single variable, adjust the mixing ratio of the target gas.

[0096] S24. If > , then the bubble stability is insufficient, that is, reduce the target gas ratio;

[0097] like < , then the bubble stability is sufficient and the target gas ratio can be increased. / ≥95%, stop increasing the delivery ratio and set it as the optimal delivery ratio value of the target gas.

[0098] Example 3:

[0099] This embodiment introduces a method for preparing foamed lightweight soil, including: obtaining the ratio of target gas in the mixed gas according to the optimal sealing control method of foaming gas in Example 2, and preparing the mixed gas according to the ratio of target gas in the mixed gas.

[0100] Foamed lightweight soil is prepared by mixing gas, foaming agent and aggregate.

[0101] Various technologies have achieved a degree of success in the preparation of foamed lightweight soil materials. Air, the primary filling gas in foamed lightweight soil, has proven its reliability in widespread use. Precisely for this reason, innovation in the filling gas used in foam materials has long been rare. With the increasing demand for green and low-carbon building materials, simply pursuing the stability and reliability of foamed concrete materials is no longer sufficient to meet market demands.

[0102] The purpose of the present invention is to develop a reliable method for optimizing the stable storage of target gases while meeting the quality requirements of foamed lightweight soil materials. This method utilizes online monitoring of a series of chemical reactions occurring in a mixture of a foamed water solution and foamed lightweight soil to measure the dynamic surface tension of the fluidized lightweight soil and pure foam solution under standard conditions. By establishing a pre-established mathematical relationship between the surface tension and the settling distance of the foam in a single foam system, the stability of the foam after preparation and before the termination of the chemical reaction is ensured, thereby achieving the requirement for stable storage of target gases using foamed lightweight soil materials.

[0103] Example 4:

[0104] This embodiment introduces an optimal sealing control device for foaming gas, such as Figure 3 As shown, the device programming module includes:

[0105] The indicator parameter determination module records the dynamic surface tension of the single foam solution and the mixed slurry of different light soils in real time. It measures the 1-hour settlement distance of the pure foam system without direct reaction gas under the action of multiple factors. 1 hour sedimentation distance of pure foam system with direct reaction gas When the dynamic sedimentation distance is within the limit range, the surface tension , dynamic surface tension of lightweight soil in the same system within 1 hour .

[0106] The relationship establishment and calculation module takes time as the main axis to establish the mathematical equation of the equilibrium relationship of bubbles under two types of systems and reactions, under which the surface tension changes with time and sedimentation distance, and the change curve is deduced by the single-chip computer program.

[0107] Limit module, sensor sensing element measures the real-time foam settlement distance and dynamic surface tension under a certain ratio of foaming agent and target gas, and sets the settlement distance within 1 hour When the limit value is calculated from the deductive curve .

[0108] Online monitoring module, when the difference between internal and external pressure is dynamically stable, the sensor sensing element monitors the real-time surface tension of the lightweight soil foam system online .

[0109] Judgment module, used to judge the dynamic surface tension value of lightweight soil system foam within 1 hour Is it greater than the settlement distance of a single foam system within 1 hour? Maximum surface tension at .

[0110] If not, the target gas ratio and delivery rate can be increased;

[0111] If so, reduce the target gas ratio and delivery rate and increase the air stabilization pressure.

[0112] The recording module records the maximum surface tension value of the lightweight soil foam system, the critical surface tension value of the single foam system and the corresponding settlement distance at the current moment.

[0113] The display module is used to display the dynamic change amount, change curve and duration of the actual indicator.

[0114] Example 5:

[0115] This embodiment introduces an optimal storage control method for foaming gas with CO2 as the target gas, such as Figure 4 As shown, it includes the following steps:

[0116] S1: Determine index parameters according to foam stability requirements; the index parameters are bubble surface tension of fluid lightweight soil system or dynamic surface tension and settlement distance of single bubble system;

[0117] S2: Under pure foam system, control the type of foaming agent, test large proportion of CO2 input, and meet the 1h settlement distance Surface tension value at .

[0118] S3: Measure the value according to the indicator parameter Establish a mathematical quantitative relationship and deduce the change curve by the single chip computer program; define the feasible region and obtain the limit value based on the change curve .

[0119] S4: Determination of real-time dynamic surface tension of fluid lightweight soil

[0120] S5: Judgment Is it greater than the maximum surface tension of a single foam system? If so, the optimal solution can be obtained by lowering the ratio; if not, the proportion of CO2 in the mixed gas can be further increased.

[0121] Specifically, the mathematical quantitative relationship is selected as:

[0122]

[0123]

[0124]

[0125] in, is the surface tension of water, is the surface tension of the slurry or pure foam at time t, The surface tension of the slurry or foam is the smallest value at the initial stage of the reaction. is a constant coefficient, is the settlement distance. is the dynamic surface tension of the same system of fluid lightweight soil within 1 hour, It is the peak surface tension of a single foam in the same system when the settlement distance within 1 hour is no more than 20 mm.

[0126] The method was applied to the production process of MgO lightweight soil. Field tests showed that in a mixture of an on-site foaming agent aqueous solution and CO2 bubbles, the foam surface tension and the settlement distance showed a linear relationship, B1=2.644, C1=29.217.

[0127] After step S4, the method further includes:

[0128] S6: Record the maximum surface tension value of the lightweight soil foam system, the critical surface tension value of the single foam system, and the corresponding settlement distance at the current moment, and display the dynamic change amount, change curve, and duration of the actual indicators.

[0129] In this embodiment, the production process of the lightweight soil and single foam system is continuous. By monitoring the fluctuations in the surface tension in the foam lightweight soil system and the pure foam system, the proportion of CO2 input in the production process is controlled, and the surface tension of the foam in the lightweight soil system is controlled to be less than the maximum surface tension of the same type of single foam system when the 1h settlement distance is ≤20mm. This is feasible and can meet the requirements of continuous production of the project after the parameters are set.

[0130] According to the current continuous production equipment of foam concrete, the CO2 mixing ratio, foaming agent type, cement and admixtures can be accurately measured. According to the existing surface tension tester and related equipment, the surface tension of the solution or mixed liquid can be continuously tested. The electronic testing equipment can continuously test the settlement distance of the foam in the closed container. The continuous monitoring results are input into the single-chip microcomputer for calculation.

[0131] The present invention aims to quantitatively describe the indicators required for foam stability by continuously measuring the relationship between dynamic surface tension, maximum settlement distance, and maximum surface tension in lightweight soil foam systems and similar single foam systems before continuous production. This ensures the maximization of the optimal sealing capacity of the foam concrete material, avoids insufficient foam due to excessive incorporation, and avoids excess foam waste due to insufficient incorporation. This method has significant social and economic benefits.

[0132] The technical principle of this invention is as follows: once CO2 is incorporated into the foam concrete filling gas, the carbonic acid formed by the hydration reaction reacts with the alkaline foaming agent and lightweight soil aggregate, reducing the internal pressure of the bubbles and weakening the foaming agent's surface activity. By continuously monitoring the time, surface tension, and foam group settlement distance, and inputting these into a single-chip computer for calculation, the upper limit of the settlement distance is used to control the maximum surface tension of the single bubble system. This maximum surface tension of the single foam system is then used to limit the CO2 filling ratio of the lightweight soil, achieving optimal CO2 storage.

[0133] In practical application, the following steps are included:

[0134] (1) According to the engineering requirements, the allowable defoaming efficiency of the bubble group under a certain proportion of CO2 filling is determined, that is, the upper limit of the sedimentation distance in the closed container is used for quantitative description, and the maximum change of the sedimentation distance in 1 hour when the chemical reaction develops over time is determined; that is, the engineering requirement is that the 1 hour sedimentation distance of the bubble group without direct reaction gas filling bubbles is ≤10mm, and the preliminary calibration requirement of the CO2 filled bubble group in 1 hour is ≤20mm through indoor test.

[0135] (2) Based on the dynamic changes in the surface tension of the two foam systems, a mathematical quantitative relationship is established between the surface tension of the single foam system and the settling distance; the mathematical quantitative relationship is:

[0136]

[0137]

[0138]

[0139] in, is the surface tension of water, is the surface tension of the slurry or pure foam at time t, The surface tension of the slurry or foam is the smallest value at the initial stage of the reaction. is a constant coefficient, is the settlement distance. is the dynamic surface tension value of the light soil in the CO2 system within 1 hour, It is the peak surface tension of a single foam in the same system when the settlement distance within 1 hour is no more than 20 mm.

[0140] (3) When using rosin-based air-entraining agents, the maximum CO2 input ratio is controlled at 58%-69%. When the maximum settlement distance ∈ (19.5 mm, 20 mm) of the single foam system within 1 h is calculated by inputting formula (2) into the single chip computer, the surface tension change trend obtained by inputting formula (1) is:

[0141] 19.61mm<19.68mm<19.74mm<19.83mm<19.92mm<19.97mm<20mm

[0142] 58%<60%<62%<64%<66%<68%<69%

[0143] 54.6 <54.8 <55.0 <55.2 <55.4 <55.6 <55.7

[0144] (4) According to the peak value of the single foam system of 69%, the ultimate surface tension is 55.7 , input the microcontroller limit module.

[0145] (5) The same type of rosin-based air-entraining agent solution, MgO concrete, and a mixed gas with a CO2 content greater than 60% are input into the integrated mixing chamber. After spiral stirring, the slurry is passed through a mesh with pore sizes ≤1mm, 0.1mm, and 0.01mm. The filtered mixed solution enters the sensor monitoring area and is calculated using formula (1) to obtain the displayed relationship and results. Where:

[0146] , , , , At 60 minutes, when the CO2 content is 63%, the surface tension is .

[0147] (6) Comparison of the foam surface tension of the two systems shows that Under the CO2 ratio of , the peak surface tension of the foam in the lightweight soil system within 1 hour is ; Limiting surface tension of single foam system When the CO2 content reaches 65%, the peak surface tension of the foam in the lightweight soil system within 1 hour is > , set the optimal CO2 incorporation ratio to .

[0148] (7) Displaying the actual indicator parameters and development curve on a display screen.

[0149] In this embodiment, the production process of the lightweight soil and single foam system is continuous. By monitoring the fluctuation of the surface tension in the foamed lightweight soil system and the single foam system, the stability of the production process is controlled, and the surface tension of the foam of the lightweight soil system is controlled to be less than that of the single foam system of the same type when the 1h settlement distance is met. The maximum surface tension is achievable and can meet the requirements of continuous production after parameter setting.

[0150] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for optimal sealing and control of foaming gas, characterized by: Specifically include: Step 1: Obtain mixed gases prepared according to target gases with different ratios, and prepare different pure foam systems according to different mixed gases; Step 2: Record the settlement distances of different pure foam systems per unit time, select the pure foam systems whose settlement distance distribution difference is less than a first threshold, then select the maximum settlement distance of each selected pure foam system, select the final maximum settlement distance that meets the maximum value and is less than the settlement distance specification among each maximum settlement distance, and select the pure foam system corresponding to the final maximum settlement distance; Step 3: Calculate the upper limit range of the settling distance per unit time based on the pure foam system corresponding to the final maximum settling distance; Step 4: Measure the real-time dynamic surface tension and sedimentation distance of the pure foam system corresponding to the final maximum sedimentation distance, and deduce the surface tension and sedimentation distance model of the pure foam system based on the real-time dynamic surface tension and sedimentation distance; Step 5: Calculate the surface tension limit of the pure foam system based on the upper limit value range of the settling distance per unit time and the surface tension and settling distance model of the pure foam system; Step 6: preparing a new mixed gas including the target gas, preparing a fluidized light soil system based on the new mixed gas, and measuring the surface tension of the fluidized light soil system in real time; Step 7: Compare the real-time measured surface tension of the fluidized lightweight soil system with the surface tension limit of the pure foam system. When the real-time measured surface tension of the fluidized lightweight soil system is less than the surface tension limit of the pure foam system, increase the proportion of the target gas in the new mixed gas. When the difference between the real-time measured surface tension of the fluidized lightweight soil system and the surface tension limit of the pure foam system meets a second threshold, output the proportion of the target gas in the new mixed gas. The step 3 specifically includes: Step 3.1: Prepare n groups of standard lightweight soil test blocks based on the pure foam system corresponding to the final maximum settlement distance and perform standard curing; Step 3.2: Take each group of test blocks after curing , weighing mass , calculate the density , take the maximum settlement distance of the test block with a density distribution difference less than the third threshold as the right boundary value b of the upper limit value range; Step 3.3: Cut each group of test blocks after curing , do standard compression test, after the test, calculate the density again , take the settlement distance of the maximum density test block as the left boundary value a of the upper limit value range; Step 3.4: Based on the right boundary value b and the left boundary value a, obtain the upper limit value range of the unit time settlement distance (a, b); The surface tension and sedimentation distance model expressions of the pure foam system are as follows: ； in, 、 are the model coefficients, is the settling distance of the pure foam system, It is the calculated value of surface tension of pure foam system.

2. The optimal sealing control method for foaming gas according to claim 1, characterized in that: The step 5 specifically includes: Step 5.1: Obtain the left boundary value a of the upper limit of the settling distance per unit time, and substitute the left boundary value a into the surface tension and settling distance model of the pure foam system to obtain the surface tension per unit time ; Step 5.2: Obtain the right boundary value b of the upper limit of the settling distance per unit time, and substitute the right boundary value b into the surface tension and settling distance model of the pure foam system to obtain the surface tension per unit time ; Step 5.3: Surface tension per unit time , surface tension per unit time , construct the feasible domain of pure foam system; Step 5.4: Based on the feasible region of the pure foam system, calculate the limit value of the surface tension per unit time of the pure foam system.

3. The optimal sealing control method for foaming gas according to claim 2, characterized in that: The expression of the feasible region of the pure foam system is as follows: ； in, is the surface tension of fluid lightweight soil slurry or pure foam at time t.

4. The optimal sealing control method for foaming gas according to claim 3, characterized in that: The expression of the surface tension limit of the pure foam system is as follows: like ,but: ； like ,but: ； in, is the surface tension limit of the pure foam system, is the fourth threshold.

5. The optimal sealing control method for foaming gas according to claim 1, characterized in that: The target gas is a reactive gas or a non-reactive gas.

6. The optimal sealing control method for foaming gas according to claim 1, characterized in that: The first threshold is set to 5 mm; the third threshold is set to 5%.

7. The optimal sealing control method for foaming gas according to claim 4, characterized in that: The fourth threshold is set to 5%.

8. A method for preparing foamed lightweight soil, characterized by: include: According to an optimal sealing control method for foaming gas according to any one of claims 1 to 7, a ratio of a target gas in a mixed gas is obtained, and a mixed gas is prepared according to the ratio of the target gas in the mixed gas.

Images