Test device and method for the effect of carbon dioxide penetration on soil under different pressures

Abstract

The present invention provides a test device and method for the influence of carbon dioxide penetration on soil under different pressures, which belongs to the field of environmental monitoring. The technical scheme is as follows: a rock layer and a soil layer are arranged in a box; the bottom of the side of the gas pre-storage barrel is connected to the box through a pipe 1, a pipe 2 is arranged at the bottom of the side of the gas pre-storage barrel and at a position opposite to the pipe 1, the other end of the pipe 2 is connected to the carbon dioxide gas tank, a flow valve is arranged on the pipe 2, a sealing plug is arranged concentrically inside the gas pre-storage barrel, and an electric push rod is arranged directly above the gas pre-storage barrel, the push rod of the electric push rod is arranged concentrically with the gas pre-storage barrel and the lower end extends into the gas pre-storage barrel and is connected to the sealing plug, and the lower end face of the gas pre-storage barrel is provided with an exhaust pipe 1 and an exhaust pipe 2 is arranged on the upper end face. The beneficial effect of the present invention is that different pressures can be applied to carbon dioxide so as to measure the influence of the penetration of carbon dioxide on the changes of various soil indicators over a certain period of time.

Description

Technical Field

[0001] The invention relates to the field of environmental monitoring, and in particular to a test device and method for the influence of carbon dioxide penetration on soil under different pressures. Background Art

[0002] Environmental problems caused by global climate change have brought unprecedented challenges to governments and scientists. The frequent occurrence of various extreme weather conditions may be related to the large-scale emission of greenhouse gases represented by CO2. CO2 disposal technology has attracted more and more attention from researchers at home and abroad, hoping to use a variety of methods to control greenhouse gas emissions while maintaining sustainable economic development. CO2 capture and storage (CCS), as an emerging CO2 disposal technology with large-scale application potential, provides a possibility for near-zero CO2 emissions from fossil energy use.

[0003] From a technical perspective, although CO2 capture and geological storage technology has matured, the main reason that restricts its large-scale promotion and application lies in its economic efficiency and the safety of storage. The economic efficiency can be improved through continuous technological innovation and the implementation of carbon tax, but the public has always been concerned and questioned about the safety of CO2 underground storage (i.e., leakage may occur). Because CCS needs to effectively seal CO2 deep in the earth, but with the changes in the earth's internal pressure and the sudden events caused by tectonic activities (such as earthquakes), as well as the influence of human factors (such as the unsealed treatment of abandoned wells), the risk of CO2 leakage and escape still exists, which will directly affect the soil, groundwater, and the normal ecological environment of humans, animals and plants. Therefore, targeted research on this in advance can provide a theoretical basis for preventing and controlling the impact of carbon dioxide penetration on the ecological environment due to changes in pressure. Summary of the invention

[0004] The purpose of the present invention is to provide a test device and method that can apply different pressures to carbon dioxide so as to measure the changes in various soil indicators caused by the penetration of carbon dioxide over a certain period of time and obtain the impact of the penetration of carbon dioxide on the soil under different pressures.

[0005] The present invention is achieved through the following measures: a test device for the influence of carbon dioxide penetration on soil under different pressures, characterized in that it includes a box body, a rock layer is arranged at the bottom of the box body, and a soil layer is arranged inside the box body and above the rock layer; it also includes a sealed gas pre-storage barrel, the bottom of the side of the gas pre-storage barrel is connected to the box body through a pipeline 1, the pipeline 1 is located at the bottom of the rock layer, a pipeline 2 is arranged at the bottom of the side of the gas pre-storage barrel and opposite to the pipeline 1, the other end of the pipeline 2 is connected to the carbon dioxide gas tank, a flow valve is arranged on the pipeline 2, a sealing plug is concentrically arranged inside the gas pre-storage barrel, and it also includes an electric push rod arranged just above the gas pre-storage barrel, the push rod of the electric push rod is concentrically arranged with the gas pre-storage barrel and the lower end extends into the gas pre-storage barrel and is connected with the sealing plug, the lower end surface of the gas pre-storage barrel is provided with an exhaust pipe 1 and the upper end surface is provided with an exhaust pipe 2, the exhaust pipe 2 is connected to the absorption tank through a hose, and the pipeline 1, the exhaust pipe 1 and the exhaust pipe 2 are all provided with control valves.

[0006] The absorption tank is provided with a solution that can react with carbon dioxide, which can be a clear calcium hydroxide solution. After reacting with carbon dioxide, the clear calcium hydroxide solution will become turbid and generate calcium carbonate precipitation. Purple litmus solution can also be used. Purple litmus solution will turn red when reacting with carbon dioxide, and both can react with carbon dioxide gas.

[0007] For soil sampling, the original state of the soil should be maintained as much as possible. Generally, the sampled soil needs to be stored in a sealed space in darkness and at a temperature of 0-4° C. Various soil parameters can be measured using existing technologies, which will not be described in detail here.

[0008] Furthermore, it also includes a movable frame, which includes two columns, a connecting plate is fixedly arranged between the inner sides of the bottoms of the columns, the box is fixedly arranged on the connecting plate, and a shaft is fixedly arranged at the middle position of the outer side of the column;

[0009] It also includes a frame, the shaft is arranged on the frame through a bearing seat, any of the shafts extends out of the bearing seat and is connected to a motor with a reducer, and the motor is arranged on the frame; the pipeline 1 includes a box body pipe connected to the box body, a connecting pipe and a gas pre-storage barrel pipe connected to the gas pre-storage barrel, the box body pipe and the gas pre-storage barrel pipe are both provided with external threads with consistent parameters at one end adjacent to the gas pre-storage barrel pipe, the length of the external thread is greater than the length of the connecting pipe, the connecting pipe is connected to the box body pipe and the gas pre-storage barrel pipe respectively through threaded connection, and the box body pipe passes through the column and is connected to the connecting pipe; a support plate is arranged on the other side of the frame opposite to the motor, the gas pre-storage barrel is arranged on the support plate, the support plate is located below the outer side of the bearing seat, a top plate is arranged above the frame and at a position corresponding to the support plate, the housing of the electric push rod is fixed on the top plate, the bottom end of the exhaust pipe 1 passes through the support plate, an L-shaped fixing plate is arranged at the bottom of the support plate, and the absorption pool is arranged on the L-shaped fixing plate; the carbon dioxide gas cylinder is arranged on one side of the frame. The box adopts a regular geometric shape, which can be a cube or a cylinder. When the motor is started, it can drive the shaft and the box to rotate together. As long as it is tilted at a certain angle, it is convenient to place the sample to be tested in the box. After the experiment is completed, a container can be placed under the box to directly remove the sample in the box.

[0010] Furthermore, studs are provided above the columns, a cover plate is provided above the box body, a movable plate is provided above the cover plate, both ends of the movable plate are sleeved on the studs, and the movable plate is fixed to the cover plate by nuts. According to specific test requirements, the box body can be sealed by the cover plate, and the box body can be tested in a sealed state, or it can be tested in an exposed state. The movable plate can be used to fix the cover plate and prevent the sample from flowing out when tilted. The cover plate can be connected to the box body through a threaded connection, or it can be fixed only by the cooperation of the movable plate, screw and nut.

[0011] Furthermore, a sensor for measuring the concentration of carbon dioxide is arranged in the gas pre-storage barrel.

[0012] A test method for the effect of carbon dioxide penetration on soil under different pressures, characterized by comprising:

[0013] Step (1): sampling the soil in the area to be tested, using pebbles or basalt as a rock layer in the box, evenly spreading a certain amount of sampled soil on the rock layer, and measuring the moisture, pH value, organic carbon, electrical conductivity, SO42-, CO32-, HCO3-, and effective Na, K, Ca, Mg, Fe, Mn, Zn, Pb, Cr, Cu, total bacteria count, total nitrogen, and available phosphorus of the sampled soil by measuring instruments, and recording them;

[0014] Step (2): exhausting the air in the gas pre-storage barrel, and injecting a certain amount of carbon dioxide into the gas pre-storage barrel through the carbon dioxide cylinder; applying a specific pressure to the carbon dioxide in the gas pre-storage barrel and maintaining it for a certain period of time, so that the carbon dioxide gradually enters the box; measuring soil moisture, pH value, organic carbon, conductivity, SO42-, CO32-, HCO3-, and effective Na, K, Ca, Mg, Fe, Mn, Zn, Pb, Cr, Cu, total bacteria count, total nitrogen and available phosphorus by instruments in different time periods, and recording them one by one; after the carbon dioxide in the gas pre-storage barrel is exhausted, immediately measuring and recording the soil parameters by measuring instruments;

[0015] Step (3) repeat the above steps but increase the pressure applied and record the data;

[0016] Step (4): Analyze and process the recorded data. The existing technology can be used to analyze and process the data, which will not be described in detail here.

[0017] The step (1) specifically includes: starting the motor to place the box in an inclined position, then setting the rock layer and soil, and after completion, restoring the box to a vertical position.

[0018] The step (2) is specifically as follows: placing the hose outside the absorption pool, opening the valve on the exhaust pipe 1, while all other valves are in a closed state, starting the electric push rod, closing the electric push rod when the sealing plug is at the lowest position, placing the hose inside the absorption pool, opening the valve on the exhaust pipe 2 and the flow valve, and setting the flow value, while starting the electric push rod, when a reaction occurs in the absorption pool, closing the valve on the exhaust pipe 1, when the sealing plug is at the highest position, closing the valve on the exhaust pipe 2, and closing the flow valve when the carbon dioxide fills the gas pre-storage barrel; opening the valve on the pipe 1, closing other valves, starting the electric push rod, and setting the pressure value, and the sealing plug applies pressure to the carbon dioxide. The capacity of the carbon dioxide in the gas pre-storage barrel can be determined based on the flow rate and opening time of the flow valve, and a concentration sensor is also provided for auxiliary reference of data.

[0019] The electric push rod is of low speed type.

[0020] In addition, the device can form a fixed rock layer by placing basalt or pebbles in a mold, so that the effect of applying different pressures of carbon dioxide on the same soil can be measured.

[0021] When starting the motor, the connecting pipe should be separated from the box body pipe first, so that the connecting pipe is completely on the gas pre-storage barrel pipe, so as to avoid affecting the rotation of the box body. The carbon dioxide gas cylinder adopts the existing technology. The sealing plug should be provided with a sealing structure, the side surface is set in a stepped shape and provided with a sealing ring, and it can also be other structures or solutions that effectively prevent gas penetration.

[0022] Compared with the prior art, the beneficial effects of the present invention are: measuring the changes in various soil indicators due to carbon dioxide penetration over a certain period of time, and obtaining a test device and method for the influence of carbon dioxide penetration on soil under different pressures. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0024] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0025] Figure 3 It is a schematic structural diagram of the sealing plug of the present invention.

[0026] Among them, the figure markings are: 1, box body; 101, cover plate; 102, movable plate; 2, gas pre-storage barrel; 201, exhaust pipe 1; 202, exhaust pipe 2; 203, hose 3, pipeline 1; 301, box body pipe; 302, connecting pipe; 303, gas pre-storage barrel pipe; 4, pipeline 2; 401, flow valve; 5, carbon dioxide gas cylinder; 6, electric push rod; 601, push rod; 602, sealing plug; 7, absorption tank; 8, movable frame; 801, column; 802, connecting plate; 803, shaft; 804, bearing seat; 805, stud; 806, nut; 9, frame; 901, support plate; 902, top plate; 903, L-shaped fixing plate; 10, motor. DETAILED DESCRIPTION

[0027] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0028] See also Figure 1-Figure 3, a test device for the influence of carbon dioxide penetration on soil under different pressures, comprising a box body 1, a rock layer is arranged at the bottom of the box body 1, and a soil layer is arranged inside the box body 1 and above the rock layer; it also comprises a sealed gas pre-storage barrel 2, the bottom of the side of the gas pre-storage barrel 2 is connected to the box body 1 through a pipe 3, the pipe 3 is located at the bottom of the rock layer, a pipe 4 is arranged at the bottom of the side of the gas pre-storage barrel 2 and opposite to the pipe 3, the other end of the pipe 4 is connected to the carbon dioxide gas tank 5, and a flow rate is arranged on the pipe 4 Valve 401, a sealing plug 201 is concentrically arranged inside the gas pre-storage barrel 2, and also includes an electric push rod 6 arranged directly above the gas pre-storage barrel 2, the push rod 601 of the electric push rod 6 is concentrically arranged with the gas pre-storage barrel 2 and the lower end extends into the gas pre-storage barrel 2 and is connected with the sealing plug, the lower end face of the gas pre-storage barrel 2 is provided with an exhaust pipe 201- and the upper end face is provided with an exhaust pipe 202, the exhaust pipe 202 is connected to the absorption tank 7 through a hose 203, and control valves are provided on the pipeline 13, the exhaust pipe 1 201 and the exhaust pipe 2 202.

[0029] The absorption tank 7 is provided with a solution that can react with carbon dioxide, which can be a clear calcium hydroxide solution. After reacting with carbon dioxide, the clear calcium hydroxide solution will become turbid and generate calcium carbonate precipitation. Purple litmus solution can also be used. Purple litmus solution will turn red when reacting with carbon dioxide, and both can react with carbon dioxide gas.

[0030] For soil sampling, the original state of the soil should be maintained as much as possible. Generally, the sampled soil needs to be stored in a sealed space in darkness and at a temperature of 0-4° C. Various soil parameters can be measured using existing technologies, which will not be described in detail here.

[0031] Furthermore, it also includes a movable frame 8, which includes two columns 801, a connecting plate 802 is fixedly arranged between the inner sides of the bottoms of the columns 801, the box body 1 is fixedly arranged on the connecting plate 802, and a shaft 803 is fixedly arranged at the middle position of the outer side of the column 801; it also includes a frame 9, the shaft 803 is arranged on the frame 9 through a bearing seat 804, any shaft 803 extends out of the bearing seat 804 and is connected to the motor 10 with a reducer, and the motor 10 is arranged on the frame 9; the pipeline 13 includes a box body pipe 301 connected to the box body 1, a connecting pipe 302 and a gas pre-storage barrel pipe 303 connected to the gas pre-storage barrel 2, and the adjacent ends of the box body pipe 301 and the gas pre-storage barrel pipe 303 are both provided with external threads with the same parameters, and the length of the external threads is large. The length of the connecting pipe 302 is determined by the threaded connection. The connecting pipe 302 is connected to the box pipe 301 and the gas pre-storage barrel pipe 303 respectively. The box pipe 301 passes through the column 801 and is connected to the connecting pipe 302; a support plate 901 is arranged on the other side of the frame 9 opposite to the motor 10, and a gas pre-storage barrel 2 is arranged on the support plate 901. The support plate 901 is located below the outer side of the bearing seat 804. A top plate 902 is arranged above the frame 9 and at a position corresponding to the support plate 901. The housing of the electric push rod 6 is fixed on the top plate 902. The bottom end of the exhaust pipe 201 passes through the support plate 901. An L-shaped fixing plate 903 is arranged at the bottom of the support plate 901. The absorption pool 7 is arranged on the L-shaped fixing plate 903; the carbon dioxide gas tank 5 is arranged on one side of the frame 9. The box 1 adopts a regular geometric shape, which can be a cube or a cylinder. When the motor 10 is started, the shaft 803 and the box 1 can be driven to rotate together. As long as it is tilted at a certain angle, the sample to be tested can be conveniently placed in the box 1. After the experiment is completed, a container can be placed under the box 1 to directly discharge the sample in the box 1.

[0032] Furthermore, studs 805 are arranged above the columns 801, a cover plate 101 is arranged above the box body 1, a movable plate 102 is arranged above the cover plate 101, both ends of the movable plate 102 are sleeved on the studs 805, and the movable plate 102 is fixed to the cover plate 101 by nuts 806. According to specific test requirements, the box body 1 can be placed in a sealed state through the cover plate 101, so that the box body 1 can be tested in a sealed state, or it can be tested in an exposed state. The movable plate 102 can firstly fix the cover plate 101, and secondly, it can prevent the sample from flowing out when tilted. The cover plate 101 can be connected to the box body 1 through a threaded connection, or it can be fixed only by the cooperation of the movable plate 102, the screw 805 and the nut 806.

[0033] Furthermore, a sensor for measuring the concentration of carbon dioxide is provided in the gas pre-storage barrel 2 .

[0034] A test method for the effect of carbon dioxide penetration on soil under different pressures, characterized by comprising:

[0035] Step (1): sampling the soil of the area to be tested, using pebbles or basalt as a rock layer in the box 1, evenly spreading a certain amount of sampled soil on the rock layer, and measuring the moisture, pH value, organic carbon, conductivity, SO42-, CO32-, HCO3-, and effective Na, K, Ca, Mg, Fe, Mn, Zn, Pb, Cr, Cu, total bacteria count, total nitrogen, and available phosphorus of the sampled soil by measuring instruments, and recording them;

[0036] Step (2): exhaust the air in the gas pre-storage barrel 2, and inject a certain amount of carbon dioxide into the gas pre-storage barrel 2 through the carbon dioxide cylinder 4; apply a specific pressure to the carbon dioxide in the gas pre-storage barrel 2 and maintain it for a certain period of time, so that the carbon dioxide gradually enters the box 1; measure the soil moisture, pH value, organic carbon, conductivity, SO42-, CO32-, HCO3-, and effective Na, K, Ca, Mg, Fe, Mn, Zn, Pb, Cr, Cu, total bacteria count, total nitrogen and available phosphorus in different time periods through instruments, and record them one by one; after the carbon dioxide in the gas pre-storage barrel 2 is exhausted, immediately measure and record the soil parameters through measuring instruments;

[0037] Step (3) repeat the above steps but increase the pressure applied and record the data;

[0038] Step (4): Analyze and process the recorded data. The existing technology can be used to analyze and process the data, which will not be described in detail here.

[0039] The step (1) is specifically as follows: starting the motor 10 to place the box body 1 in an inclined position, and then setting the rock layer and soil, and after completion, restoring the box body 1 to a vertical position.

[0040] The step (2) is specifically as follows: placing the hose 203 outside the absorption pool 7, opening the valve on the exhaust pipe 1 201, and keeping other valves closed, starting the electric push rod 6, and when the sealing plug 602 is at the lowest position, closing the electric push rod 6, placing the hose 203 in the absorption pool 7, opening the valve of the exhaust pipe 2 202 and the flow valve 401, and setting the flow value, and starting the electric push rod 6 at the same time, when the reaction occurs in the absorption pool 7, closing the valve on the exhaust pipe 1 201, and when the sealing plug 602 is at the highest position, closing the valve on the exhaust pipe 2 202, and closing the flow valve 401 when the carbon dioxide fills the gas pre-storage barrel 2; opening the valve on the pipeline 1 3, closing other valves, starting the electric push rod 6, and setting the pressure value, and the sealing plug 602 applies pressure to the carbon dioxide. The capacity of the carbon dioxide in the gas pre-storage barrel 2 can be judged according to the flow rate and opening time of the flow valve 401, and there is also a concentration sensor for auxiliary reference of data.

[0041] The electric push rod 6 adopts a low-speed type.

[0042] Alternatively, the device can form a fixed rock layer by placing basalt or pebbles in a mold, so that the effects of applying different pressures of carbon dioxide to the same soil can be measured.

[0043] Implementation 2:

[0044] See also Figure 1-Figure 3 , a test device for the influence of carbon dioxide penetration on soil under different pressures, comprising a box body 1, a rock layer is arranged at the bottom of the box body 1, and a soil layer is arranged inside the box body 1 and above the rock layer; it also comprises a sealed gas pre-storage barrel 2, the bottom of the side of the gas pre-storage barrel 2 is connected to the box body 1 through a pipe 3, the pipe 3 is located at the bottom of the rock layer, a pipe 4 is arranged at the bottom of the side of the gas pre-storage barrel 2 and opposite to the pipe 3, the other end of the pipe 4 is connected to the carbon dioxide gas tank 5, and a flow rate is arranged on the pipe 4 Valve 401, a sealing plug 201 is concentrically arranged inside the gas pre-storage barrel 2, and also includes an electric push rod 6 arranged directly above the gas pre-storage barrel 2, the push rod 601 of the electric push rod 6 is concentrically arranged with the gas pre-storage barrel 2 and the lower end extends into the gas pre-storage barrel 2 and is connected with the sealing plug, the lower end face of the gas pre-storage barrel 2 is provided with an exhaust pipe 201- and the upper end face is provided with an exhaust pipe 202, the exhaust pipe 202 is connected to the absorption tank 7 through a hose 203, and control valves are provided on the pipeline 13, the exhaust pipe 1 201 and the exhaust pipe 2 202.

[0045] The absorption tank 7 is provided with a solution that can react with carbon dioxide, which can be a clear calcium hydroxide solution. After reacting with carbon dioxide, the clear calcium hydroxide solution will become turbid and generate calcium carbonate precipitation. Purple litmus solution can also be used. Purple litmus solution will turn red when reacting with carbon dioxide, and both can react with carbon dioxide gas.

[0046] For soil sampling, the original state of the soil should be maintained as much as possible. Generally, the sampled soil needs to be stored in a sealed space in darkness and at a temperature of 0-4° C. Various soil parameters can be measured using existing technologies, which will not be described in detail here.

[0047] Embodiment three:

[0048] See also Figure 1-Figure 3, a test device for the influence of carbon dioxide penetration on soil under different pressures, comprising a box body 1, a rock layer is arranged at the bottom of the box body 1, and a soil layer is arranged inside the box body 1 and above the rock layer; it also comprises a sealed gas pre-storage barrel 2, the bottom of the side of the gas pre-storage barrel 2 is connected to the box body 1 through a pipe 3, the pipe 3 is located at the bottom of the rock layer, a pipe 4 is arranged at the bottom of the side of the gas pre-storage barrel 2 and opposite to the pipe 3, the other end of the pipe 4 is connected to the carbon dioxide gas tank 5, and a flow rate is arranged on the pipe 4 Valve 401, a sealing plug 201 is concentrically arranged inside the gas pre-storage barrel 2, and also includes an electric push rod 6 arranged directly above the gas pre-storage barrel 2, the push rod 601 of the electric push rod 6 is concentrically arranged with the gas pre-storage barrel 2 and the lower end extends into the gas pre-storage barrel 2 and is connected with the sealing plug, the lower end face of the gas pre-storage barrel 2 is provided with an exhaust pipe 201- and the upper end face is provided with an exhaust pipe 202, the exhaust pipe 202 is connected to the absorption tank 7 through a hose 203, and control valves are provided on the pipeline 13, the exhaust pipe 1 201 and the exhaust pipe 2 202.

[0049] The absorption tank 7 is provided with a solution that can react with carbon dioxide, which can be a clear calcium hydroxide solution. After reacting with carbon dioxide, the clear calcium hydroxide solution will become turbid and generate calcium carbonate precipitation. Purple litmus solution can also be used. Purple litmus solution will turn red when reacting with carbon dioxide, and both can react with carbon dioxide gas.

[0050] For soil sampling, the original state of the soil should be maintained as much as possible. Generally, the sampled soil needs to be stored in a sealed space in darkness and at a temperature of 0-4° C. Various soil parameters can be measured using existing technologies, which will not be described in detail here.

[0051] Furthermore, it also includes a movable frame 8, which includes two columns 801, a connecting plate 802 is fixedly arranged between the inner sides of the bottoms of the columns 801, the box body 1 is fixedly arranged on the connecting plate 802, and a shaft 803 is fixedly arranged at the middle position of the outer side of the column 801; it also includes a frame 9, the shaft 803 is arranged on the frame 9 through a bearing seat 804, any shaft 803 extends out of the bearing seat 804 and is connected to the motor 10 with a reducer, and the motor 10 is arranged on the frame 9; the pipeline 13 includes a box body pipe 301 connected to the box body 1, a connecting pipe 302 and a gas pre-storage barrel pipe 303 connected to the gas pre-storage barrel 2, and the adjacent ends of the box body pipe 301 and the gas pre-storage barrel pipe 303 are both provided with external threads with the same parameters, and the length of the external threads is large. The length of the connecting pipe 302 is determined by the threaded connection. The connecting pipe 302 is connected to the box pipe 301 and the gas pre-storage barrel pipe 303 respectively. The box pipe 301 passes through the column 801 and is connected to the connecting pipe 302; a support plate 901 is arranged on the other side of the frame 9 opposite to the motor 10, and a gas pre-storage barrel 2 is arranged on the support plate 901. The support plate 901 is located below the outer side of the bearing seat 804. A top plate 902 is arranged above the frame 9 and at a position corresponding to the support plate 901. The housing of the electric push rod 6 is fixed on the top plate 902. The bottom end of the exhaust pipe 201 passes through the support plate 901. An L-shaped fixing plate 903 is arranged at the bottom of the support plate 901. The absorption pool 7 is arranged on the L-shaped fixing plate 903; the carbon dioxide gas tank 5 is arranged on one side of the frame 9. The box 1 adopts a regular geometric shape, which can be a cube or a cylinder. When the motor 10 is started, the shaft 803 and the box 1 can be driven to rotate together. As long as it is tilted at a certain angle, the sample to be tested can be conveniently placed in the box 1. After the experiment is completed, a container can be placed under the box 1 to directly discharge the sample in the box 1.

[0052] Technical features not described in the present invention can be achieved through or by adopting existing technologies and will not be described in detail here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A test device for the effect of carbon dioxide penetration on soil under different pressures, characterized in that: It comprises a box body, wherein a rock layer is arranged at the bottom of the box body, and a soil layer is arranged inside the box body and above the rock layer; It also includes a sealed gas pre-storage barrel, the bottom of the side of the gas pre-storage barrel is connected to the box body through a pipe 1, the pipe 1 is located at the bottom of the rock layer, a pipe 2 is arranged at the bottom of the side of the gas pre-storage barrel and opposite to the pipe 1, the other end of the pipe 2 is connected to the carbon dioxide gas tank, a flow valve is arranged on the pipe 2, a sealing plug is concentrically arranged inside the gas pre-storage barrel, and an electric push rod is arranged directly above the gas pre-storage barrel, the push rod of the electric push rod is concentrically arranged with the gas pre-storage barrel and the lower end extends into the gas pre-storage barrel and is connected to the sealing plug, the lower end face of the gas pre-storage barrel is provided with an exhaust pipe 1 and the upper end face is provided with an exhaust pipe 2, and the exhaust pipe 2 is connected to the absorption tank through a hose; It also includes a movable frame, which includes two columns, a connecting plate is fixedly arranged between the inner sides of the bottoms of the columns, the box is fixedly arranged on the connecting plate, and a shaft is fixedly arranged at the middle position of the outer side of the column; It also includes a frame, the shaft is arranged on the frame through a bearing seat, any one of the shafts extends out of the bearing seat and is connected to a motor with a reducer, and the motor is arranged on the frame; The pipeline 1 includes a box body tube connected to the box body, a connecting tube and a gas pre-storage barrel tube connected to the gas pre-storage barrel, the box body tube and the gas pre-storage barrel tube are both provided with external threads with the same parameters at one end adjacent to each other, the length of the external threads is greater than the length of the connecting tube, the connecting tube is respectively connected to the box body tube and the gas pre-storage barrel tube through threaded connection, and the box body tube passes through the column and is connected to the connecting tube; A support plate is provided on the other side of the frame opposite to the motor, the gas pre-storage barrel is provided on the support plate, the support plate is located below the outer side of the bearing seat, a top plate is provided above the frame and at a position corresponding to the support plate, the housing of the electric push rod is fixed on the top plate, the bottom end of the exhaust pipe 1 passes through the support plate, an L-shaped fixing plate is provided at the bottom of the support plate, and the absorption tank is provided on the L-shaped fixing plate; The carbon dioxide gas tank is arranged on one side of the frame; Studs are arranged above the columns, a cover plate is arranged above the box body, a movable plate is arranged above the cover plate, both ends of the movable plate are sleeved on the studs, and the movable plate is fixed to the cover plate by nuts; The test method for the effect of carbon dioxide penetration on soil under different pressures in the test device includes: Step (1): sampling the soil in the area to be tested, using pebbles or basalt as a rock layer in the box, evenly spreading a certain amount of sampled soil on the rock layer, and measuring the moisture, pH value, organic carbon, electrical conductivity, SO42-, CO32-, HCO3-, and effective Na, K, Ca, Mg, Fe, Mn, Zn, Pb, Cr, Cu, total bacteria count, total nitrogen, and available phosphorus of the sampled soil by measuring instruments, and recording them; Step (2): exhausting the air in the gas pre-storage barrel, and injecting a certain amount of carbon dioxide into the gas pre-storage barrel through the carbon dioxide cylinder; applying a specific pressure to the carbon dioxide in the gas pre-storage barrel and maintaining it for a certain period of time, so that the carbon dioxide gradually enters the box; measuring soil moisture, pH value, organic carbon, conductivity, SO42-, CO32-, HCO3-, and effective Na, K, Ca, Mg, Fe, Mn, Zn, Pb, Cr, Cu, total bacteria count, total nitrogen, and available phosphorus by instruments in different time periods, and recording them one by one; after the carbon dioxide in the gas pre-storage barrel is exhausted, immediately measuring and recording the soil parameters by measuring instruments; Step (3) repeat the above steps but increase the pressure value and record the data; Step (4): Analyze and process the recorded data; The step (1) specifically includes: starting the motor to place the box in an inclined position, then setting the rock layer and soil, and after completion, restoring the box to a vertical position.

2. The test device for the effect of carbon dioxide penetration on soil under different pressures according to claim 1, characterized in that: The pipeline 1, the exhaust pipe 1 and the exhaust pipe 2 are all provided with control valves.

3. The test device for the effect of carbon dioxide penetration on soil under different pressures according to claim 1, characterized in that: A sensor for measuring the concentration of carbon dioxide is arranged in the gas pre-storage barrel.

4. The test device for the effect of carbon dioxide penetration on soil under different pressures according to claim 1, characterized in that: The step (2) specifically comprises: placing the hose outside the absorption pool, opening the valve on the exhaust pipe 1, keeping other valves in a closed state, starting the electric push rod, closing the electric push rod when the sealing plug is at the lowest position, placing the hose inside the absorption pool, opening the valve on the exhaust pipe 2 and the flow valve, setting the flow value, and starting the electric push rod at the same time, and when a reaction occurs in the absorption pool, closing the valve on the exhaust pipe 1, closing the valve on the exhaust pipe 2 when the sealing plug is at the highest position, and closing the flow valve when the carbon dioxide fills the gas pre-storage barrel; The valve on the pipeline 1 is opened, the other valves are closed, the electric push rod is started, and the pressure value is set, and the sealing plug applies pressure to the carbon dioxide.

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