Sample container, reaction tank and carbon dioxide geologic body sealing simulation experiment system

Abstract

The invention discloses a sample container, a reaction tank and a carbon dioxide geologic body sealing simulation experiment system.The sample container is provided with an opening and a step groove formed in the opening, a spring is arranged at the groove bottom of the step groove, and a hole and a film for sealing the hole are further arranged at the groove bottom of the step groove; a movable cover is placed in the step groove, a sealing ring matched with the side wall of the step groove is arranged on the edge of the movable cover, a spine part is further arranged on the movable cover, and the position of the spine part corresponds to that of the film; the sample container is placed under the condition of continuously increasing external air pressure, and the movable cover is pressed to be close to the groove bottom of the step groove and drives the spine part to pierce the film, so that the sample container is communicated with the external air pressure condition.

Description

Technical Field

[0001] The present invention belongs to the technical field of geological storage of carbon dioxide, and in particular to a reaction device for simulating the carbon dioxide storage process in a geological body under high-temperature and high-pressure geological conditions in a laboratory, and in particular to a reaction device for continuous high-temperature and high-pressure interaction between water, rock (including coal) and carbon dioxide, and belongs to the field of geological storage of carbon dioxide. Background Art

[0002] Carbon dioxide is a colorless, odorless compound that is gaseous at normal temperature and pressure. Carbon dioxide emissions can cause global warming, greenhouse effect, and extreme weather, such as typhoons, high temperatures, heavy rains, mudslides, droughts and other natural disasters. With the continuous development of global social economy and science and technology, the problem of excessive carbon emissions has gradually begun to attract people's attention. Among the methods of carbon dioxide treatment, carbon dioxide geological storage technology plays a very important role.

[0003] In order to reduce the harm of carbon dioxide to the environment, all countries have taken certain measures. In terms of the design of carbon dioxide sequestration equipment, both domestic and foreign countries have experienced more than 100 years of development in this area, and have formed relatively mature theoretical research and instrument manufacturing. However, few people have been involved in the design of equipment for geological storage of carbon dioxide under high temperature and high pressure. In the underground environment, after carbon dioxide is injected, it will interact with coal, rock, and water, causing changes in the physical properties, structure, and chemical properties of coal, which we cannot observe.

[0004] For example, a common method is to place the sample container in a closed environment and gradually increase the pressure to reach the target pressure. However, in this method, the sample container is set open, and the reaction conditions (especially the pressure conditions) of the sample container are unstable in the early stage and will slowly increase to the target value. This part of the process has an impact on the storage of carbon dioxide geological bodies, and the impact is gradually obvious, but it does not meet the requirements of the set reaction conditions. Summary of the invention

[0005] In view of the above technical problems, this application proposes a sample container, a reaction tank and a carbon dioxide geological body sealing simulation experimental system. The specific technical solutions are as follows:

[0006] In a first aspect, the present application provides a sample container, the sample container having an opening and a step groove arranged at the opening, a spring being arranged at the bottom of the step groove, a hole being arranged at the bottom of the step groove and a membrane sealing the hole;

[0007] A movable cover is placed in the step groove, a sealing ring is arranged at the edge of the movable cover to match the side wall of the step groove, and a spike portion is also arranged on the movable cover, and the position of the spike portion corresponds to the membrane;

[0008] The sample container is placed under continuously increasing external air pressure conditions, the movable cover is pressed close to the bottom of the step groove and drives the sharp thorn part to pierce the membrane, so that the sample container is connected to the external air pressure conditions.

[0009] Furthermore, a chamfer is provided on the top of the step groove;

[0010] The sample container is placed under a continuously decreasing external air pressure condition, and the movable cover bounces repeatedly at the chamfer, so that a gap is intermittently formed between the movable cover and the step groove, and then the movable cover falls back into the step groove.

[0011] In a second aspect, the present application provides a reaction tank, comprising:

[0012] A tank body and a cover body, wherein the cover body is detachably connected to the opening of the tank body, and the interior of the tank body has an oil bath cavity, that is, an electric heating wire is arranged in the oil bath cavity;

[0013] A pressure relief valve, wherein the pressure relief valve is fixed on the cover body;

[0014] A pipeline assembly, the pipeline assembly runs from the outside to the inside of the tank, and the pipeline assembly includes three independent liquid supply pipelines, gas supply pipelines and vacuum pipelines;

[0015] The sample container is placed in the tank body.

[0016] Furthermore, the oil bath cavity is arranged inside the side wall of the tank body, and the oil bath cavity is annular.

[0017] Furthermore, the oil bath chamber has an oil filling port arranged at the open end of the tank body.

[0018] Furthermore, the cover body is provided with an observation window.

[0019] Furthermore, a motor and a bracket fixed on the motor shaft are fixed at the bottom of the tank body, and a plurality of sample containers are placed on the bracket. The sample containers pass through the outlet of the pipeline assembly in sequence as the bracket rotates.

[0020] Furthermore, the bracket includes a connecting sleeve, a bracket and a supporting ring, and the supporting ring is connected to the connecting sleeve through the bracket.

[0021] Furthermore, it also includes a sensor, which is fixed on the cover and / or the bottom of the tank.

[0022] In a third aspect, the present application proposes a carbon dioxide geological body storage simulation experimental system, comprising:

[0023] Any of the above-mentioned reaction tanks;

[0024] and a gas supply pipeline, a water supply pipeline and a vacuum pipeline connected to the reaction tank.

[0025] The beneficial effects of the present invention are:

[0026] (1) The cooperation between the movable cover and the step groove not only does not affect the initial vacuuming operation, but also seals the sample container in the subsequent inflation and pressurization process, and matches the set target pressure by controlling the spring used. Before reaching the set target pressure, the pressure conditions of all samples are kept constant. With the cooperation of the spike part and the membrane, the sample container is instantly connected to the external reaction tank, so that the sample container can quickly reach the set target pressure, reducing unnecessary condition interference;

[0027] (2) After the tank body and the cover body form a sealed environment, water and high-pressure carbon dioxide gas can be supplied through the pipeline assembly, and the oil bath liquid in the oil bath cavity can be heated by the electric heating wire to simulate the geological storage conditions of carbon dioxide under high temperature and high pressure conditions;

[0028] (3) A bracket is set inside the tank to store multiple sample containers. The sample containers can be rotated and divided into sample containers of different specifications to explore the geological storage of carbon dioxide with different water contents. The pipeline assembly can control the experimental conditions of the sample water content of each sample container inside. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 What is shown is the structural schematic diagram of the carbon dioxide geological body storage simulation experimental system;

[0030] Figure 2 What is shown is a schematic diagram of the structure of a high-temperature and high-pressure carbon dioxide reaction tank;

[0031] Figure 3 Shown is an exploded view of the components of the reaction tank 100;

[0032] Figure 4 What is shown is the structural schematic diagram of the tank body;

[0033] Figure 5 Shown is a schematic diagram of the structure of the bracket;

[0034] Figure 6 The figure shows a configuration of the reaction tank in the test system;

[0035] Figure 7 Shown is a schematic diagram of the structure of a sample container;

[0036] Figure 8 FIG. 1 is a schematic diagram showing the structure of a movable cover matched with a sample container. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0038] Figure 1 What is shown is a structural schematic diagram of a carbon dioxide geological body storage simulation experimental system, which includes a reaction tank 100 and a gas supply pipeline, a water supply pipeline and a vacuum pipeline connected to the reaction tank 100. In addition, a temperature sensor and a pressure sensor are also arranged inside the reaction tank 100 to monitor and control the temperature and pressure inside the reaction tank 100.

[0039] The gas supply pipeline includes a gas cylinder, a pressure reducing valve, a booster air pump and a pressure stabilizing valve connected in sequence, and the gas cylinder is a CO2 gas cylinder with a pressure gauge.

[0040] The water supply pipeline includes a water tank, a water pump, a flow meter, and a water stop valve which are connected in sequence.

[0041] The vacuum line includes a connected vacuum pump and an electrically controlled valve.

[0042] Figure 2 The structure diagram of a high-temperature and high-pressure carbon dioxide reaction tank is shown. The reaction tank 100 includes a tank body 101 with an opening on the top, and a cover body 102 for sealing the tank body is provided at the opening of the tank body 101; it also includes a pressure relief valve 111 and a group of sensors 112, wherein the pressure relief valve 111 is used to reduce the internal high-pressure state of the tank body 101 to atmospheric pressure, and the sensor 112 includes at least a temperature sensor and a pressure sensor, which monitor the temperature and pressure inside the tank body 101 respectively.

[0043] In some specific embodiments, the pressure relief valve 111 and the sensor 112 are both fixedly mounted on the cover body 102 .

[0044] An observation window 103 is also provided on the cover 102 , and the observation window 103 is made of high temperature and high pressure resistant tempered glass.

[0045] The tank body 101 is also provided with a pipeline assembly 104 that runs from the outside to the inside. The pipeline assembly has three sets of independent pipelines, including a liquid supply pipeline, a gas supply pipeline and a vacuum pipeline. The liquid supply pipeline is used to provide liquid into the tank body 101, the gas supply pipeline is used to provide carbon dioxide gas into the tank body 101, and the vacuum pipeline is used to extract the gas in the tank body 101.

[0046] In order to ensure that the internal pressure of the tank body 101 remains stable after the cover body 102 closes the tank body 101, bolts 105 are provided to fix the cover body 102 to the tank body 101, and a rubber pad is provided at the connection surface between the cover body 102 and the tank body 101 to ensure sealing.

[0047] Figure 3What is shown is an exploded view of the components of the reaction tank 100 . A rotatable bracket 131 is also provided inside the tank body 101 , and a plurality of sample containers 132 can be placed on the bracket 131 . The sample containers 132 can pass through the outlet of the pipeline assembly 104 in sequence as the bracket 131 rotates.

[0048] Figure 4 The structure diagram of the tank 101 is shown. For the convenience of exemplary description, Figure 4 101 shows a schematic cross-section of the tank body layout. An annular oil bath chamber 106 is provided inside the side wall of the tank body 101. The oil bath chamber 106 has an oil filling port 107 provided at the open end of the tank body 101. The oil bath liquid is added to the oil bath chamber 106 through the oil filling port 107. At the same time, an electric heating wire 108 is provided in the oil bath chamber 106. The oil bath liquid in the oil bath chamber 106 is heated by the oil bath chamber 106, so as to maintain the required temperature conditions of the reaction tank 100.

[0049] A mounting base 133 with a built-in motor is also provided at the bottom of the tank body 101 . A rotating shaft 134 of the motor extends out through the top of the mounting base 133 . The bracket 131 is fixed to the rotating shaft 134 so that the bracket 131 is driven to rotate by the operation of the motor.

[0050] Figure 5 The figure shows a schematic diagram of the structure of the bracket 131. The bracket 131 includes a connecting sleeve 131a, a bracket 131b and a supporting ring 131c. The supporting ring 131c is connected to the connecting sleeve 131a through the bracket 131b.

[0051] The operation mode of the reaction tank 100 is:

[0052] (1) Open the cover 102. The center of the cover 102 is a round glass, and the inside can be seen. The main body of the cover 102 is made of stainless steel, and the center of the bottom surface is convex and has a rubber spiral pattern, which is used to fix and seal with the tank body 101. The bolts 105 on the cover 102 are used to strengthen the seal between the cover 102 and the tank body 101.

[0053] (2) The coal sample is placed in a sample container 132, which is an iron cylindrical tank; the sample container 132 is placed in the tank 101, the lower part of the tank 101 is a motor, the bracket 131 is fixed on the rotating shaft 134 of the motor, the sample container 132 can be clamped in the supporting ring 131c, the bracket 131 is driven by the motor, and the motor has fixed rotation angles of 90 degrees, 180 degrees, 270 degrees, and 360 degrees.

[0054] (3) Open the oil filling port 107 and add oil bath liquid into the oil bath chamber 106 through the oil filling port 107;

[0055] (4) Cover the cover 102, i.e., rotate and tighten, fix the bolts 105, and perform an airtightness test on the reaction tank 100;

[0056] (5) Open the liquid supply line of the pipeline assembly 104 and spray water into the sample container 132;

[0057] (6) Open the vacuum line of the pipeline assembly 104 and evacuate the reaction tank 100 using a vacuum pump;

[0058] (7) Open the gas supply line of the pipeline assembly 104, and inject the carbon dioxide gas pressurized by the booster gas pump into the reaction tank 100 until the pressure in the reaction tank 100 reaches the set pressure;

[0059] (8) Turn on the heating wire 108 to heat the oil bath liquid in the oil bath chamber 106 to reach the temperature required for the experiment;

[0060] (9) After the reaction is completed, the heating wire 108 is turned off, and the pressure relief valve 111 is opened. When the pressure in the tank drops to atmospheric pressure and the temperature reaches room temperature, the reaction tank 100 is opened to take out the sample container and the coal sample.

[0061] Figure 6 What is shown is a setting method of the reaction tank 100 in the test system of the present application. The reaction tank 100 is provided with multiple ones, which are placed or fixed inside a shell 201. There is a gap between the shell 201 and the reaction tank 100, and the gap is filled with insulation material to form an insulation layer 202. The stability of the temperature condition of the reaction tank 100 is maintained by the insulation layer 202. The pipeline components 104 are introduced into different reaction tanks 100 respectively by a main pipe. The number of reaction tanks 100 is determined according to actual requirements.

[0062] The shape of the housing 201 is not particularly limited and can be Figure 6 The exemplary circular shape may also be rectangular, etc.; the arrangement of the reaction tank 100 in the housing 201 is not limited to Figure 6 The ring array arrangement in .

[0063] It is still more preferred to arrange all the reaction tanks 100 in a ring array, with a main pipe dividing a number of pipe assemblies 104 from the middle and introducing them into different reaction tanks 100. This can ensure that the length of the pipe assemblies 104 is as consistent as possible, thereby controlling the consistency of the reaction conditions and avoiding differences in actual numerical parameters or control time in the reaction condition control in the reaction tank 100 due to some pipes being too long.

[0064] By setting up multiple reaction tanks 100, multiple groups of samples can be placed in the multiple reaction tanks 100 at the same time, and can react under set temperature, pressure and other experimental conditions, and can be taken out in batches according to time settings to obtain samples with different reaction times.

[0065] Figure 7 Shown is a configuration of the sample container 132. Figure 8 What is shown is a movable cover 135 matched with the sample container 132 of the arrangement. A step groove 132a is arranged at the top opening of the sample container 132, and a spring 132b is arranged at the bottom of the step groove 132a. In addition, a hole connected to the outside is arranged at the bottom of the step groove 132a, and a membrane 132c is arranged at the hole. The hole at the bottom of the step groove 132a is closed by the membrane 132c. A chamfer 132d is arranged at the top of the step groove 132a to form an outwardly expanding trumpet-shaped structure; the movable cover 135 is arranged to have the same cross-section as the step groove 132a to ensure that it can be placed in the step groove 132. A circle of sealing ring 135a is arranged at the edge of the movable cover 135. The sealing ring 135a contacts the side wall of the step groove 132a to ensure sealing. A spike portion 135b is also arranged on the movable cover 135.

[0066] In combination with the operation mode of the reaction tank 100, the operation process is adjusted so that step (4) is performed after step (5), that is:

[0067] After adding the oil bath liquid into the oil bath chamber 106 through the oil filling port 107, the liquid supply pipeline of the pipeline assembly 104 is opened first, and water is sprayed into the sample container 132. After the sample humidity condition control is completed, the movable cover 135 is placed in the step groove 132a, supported by the spring 132b, and then the vacuum pipeline of the pipeline assembly 104 is opened, and the reaction tank 100 is evacuated by the vacuum pump. In this process, on the one hand, the chamfer 132d is set at the top of the step groove 132a to have a flaring effect, that is, the movable cover 135 will be caused to exceed the chamfer 132d. A gap is formed between the movable cover 135 and the step groove 132a, thereby connecting the sample container 132 with the reaction tank 100. The movable cover 135 will bounce repeatedly at the chamfer 132d due to the vacuum operation to balance the pressure inside the sample container 132 and the inside of the reaction tank 100 until vacuum contact is achieved. On the other hand, the setting of the chamfer 132d also forms a guiding effect, so that the movable cover 135 can still fall back into the step groove 132a quickly and accurately after exceeding the chamfer 132d. After the vacuum is completed, carbon dioxide can be pumped in and the oil bath liquid can be heated.

[0068] During the process of pumping in carbon dioxide, the pressure in the reaction tank 100 gradually increases and slowly presses the movable cover 135 to the bottom of the step groove 132a. During this process, the spike portion 135b on the movable cover 135 slowly approaches the membrane 132c until the target value is reached in the reaction tank 100 and a force is generated to resist the action of the spring 132b, so that the spike portion 135b passes through the membrane 132c and punctures the membrane 132c. The reaction tank 100 is then connected to the sample container 132 again through the hole where the membrane 132c is located. After a short period of inflation, the sample container 132 can reach the target set pressure condition.

[0069] The purpose of setting the spike portion 135b to cooperate with the membrane 132c, and the purpose of the movable cover 135 to cooperate with the step groove 132a is that: under the traditional inflation method to control the pressure condition, since the sample container 132 is open in the reaction tank 100, the reaction condition (especially the pressure condition) of the sample container 132 is unstable in the early stage and will slowly increase to the target value. This part of the process has an impact on the storage of carbon dioxide geological bodies, and the impact is gradually obvious, but it does not meet the requirements of the set reaction conditions, so it is necessary to shorten the process as much as possible; and in this application, Through the cooperation of the movable cover 135 and the step groove 132a, not only will the previous vacuum operation not be affected, but also in the subsequent inflation and pressurization process, the sample container 132 will be sealed, and the set target pressure will be matched by controlling the spring 132b used. Before the set target pressure is about to be reached, the pressure conditions of all samples are maintained constant. With the cooperation of the spike portion 135b and the membrane 132c, the sample container 132 is instantly connected to the external reaction tank 100, and the sample container 132 can quickly reach the set target pressure, reducing unnecessary condition interference.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A sample container, characterized in that The sample container has an opening and a step groove arranged at the opening, a spring is arranged at the bottom of the step groove, and a hole and a membrane sealing the hole are also arranged at the bottom of the step groove; A movable cover is placed in the step groove, a sealing ring is arranged at the edge of the movable cover to match the side wall of the step groove, and a spike portion is also arranged on the movable cover, and the position of the spike portion corresponds to the membrane; The sample container is placed under continuously increasing external air pressure conditions, the movable cover is pressed close to the bottom of the step groove and drives the sharp thorn part to pierce the membrane, so that the sample container is connected to the external air pressure conditions.

2. The sample container according to claim 1, characterized in that: The top of the step groove is chamfered; The sample container is placed under a continuously decreasing external air pressure condition, and the movable cover bounces repeatedly at the chamfer, so that a gap is intermittently formed between the movable cover and the step groove, and then the movable cover falls back into the step groove.

3. A reaction tank, characterized in that: The reaction tank comprises: A tank body and a cover body, wherein the cover body is detachably connected to the opening of the tank body, and the interior of the tank body has an oil bath cavity, that is, an electric heating wire is arranged in the oil bath cavity; A pressure relief valve, wherein the pressure relief valve is fixed on the cover body; A pipeline assembly, the pipeline assembly runs from the outside to the inside of the tank, and the pipeline assembly includes three independent liquid supply pipelines, gas supply pipelines and vacuum pipelines; The sample container according to claim 1 or 2 is placed in the tank body.

4. The reaction tank according to claim 3, characterized in that: The oil bath cavity is arranged inside the side wall of the tank body, and the oil bath cavity is annular.

5. The reaction tank according to claim 3, characterized in that: The oil bath chamber has an oil filling port arranged at the open end of the tank body.

6. The reaction tank according to claim 3, characterized in that: The cover body is provided with an observation window.

7. The reaction tank according to claim 3, characterized in that: A motor and a bracket fixed on the motor shaft are fixed at the bottom of the tank body. A plurality of sample containers are placed on the bracket. The sample containers pass through the outlet of the pipeline assembly in sequence as the bracket rotates.

8. The reaction tank according to claim 7, characterized in that: The bracket comprises a connecting sleeve, a bracket and a supporting ring, and the supporting ring is connected to the connecting sleeve through the bracket.

9. The reaction tank according to claim 3, characterized in that: Also included is a sensor, which is fixed on the cover and / or the bottom of the tank.

10. Carbon dioxide geological body storage simulation experimental system, characterized in that: include: The reaction tank according to any one of claims 3 to 9; and a gas supply pipeline, a water supply pipeline and a vacuum pipeline connected to the reaction tank.

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