Test device for cemented filling carbon sequestration amount test

Abstract

The invention discloses a cemented filling carbon sequestration amount testing device which comprises a carbon sequestration reactor, a gas supply system and a control system, the carbon sequestration reactor comprises a curing box, a mass scale and a plurality of sensors, a test piece frame in the curing box is used for containing different types of cemented filling test pieces, and a plurality of gas distribution holes are formed in the peripheral side of the curing box; the mass scale is arranged below the curing box and is used for measuring the mass change of the cemented filling test piece in the reaction process; the gas supply system is used for providing a stable carbon dioxide gas source for the curing box and is used for simulating gas supply of a carbon sequestration reaction during actual mine filling; the control system is used for controlling the introduction time, the introduction amount and the introduction pressure of the carbon dioxide, and recording the temperature, the pressure and the carbon dioxide concentration value of the system, so that the accurate simulation of the actual carbon dioxide sequestration process of the mine goaf is realized, and the accurate measurement of reaction data in the simulation test is realized.

Description

Technical Field

[0001] The invention relates to the technical field of mineralization test devices, in particular to a cementation filling carbon fixation test device. Background Art

[0002] One of the main drivers of global climate change is the increase in carbon dioxide emissions, especially from the burning of coal, oil and natural gas. Industrial sectors, such as electricity, steel, cement, etc., are the main sources of carbon dioxide emissions. In order to mitigate the greenhouse effect and achieve global climate goals, carbon capture and storage (CCS) technology has become one of the important means to address climate change. The core idea of ​​CCS technology is to capture the carbon dioxide generated in the industrial production process and safely store it in geological structures through certain means, or convert it into mineral carbonates through carbon fixation technology to achieve long-term carbon storage.

[0003] In the mining field, backfill mining technology has been widely used. Mine goafs provide a potential space carrier for carbon dioxide storage, and solidifying carbon dioxide in the backfill of goafs through cementing materials is a highly promising carbon storage method. However, the carbon dioxide sequestration efficiency and the evaluation of its storage capacity in the backfill remain difficult and hot issues in research.

[0004] Traditional carbon fixation technologies often focus on chemical reactions (such as mineral carbonation), and use a thermogravimetric analyzer to test the decomposition of CaCO3 and characterize the carbon fixation in the filling body. However, this test method is complex and the results are greatly affected by the sampling position, and only the carbon fixation amount of chemical reactions can be obtained, which has great limitations on the practical operability and economy of large-scale carbon storage. Summary of the invention

[0005] The purpose of the present invention is to provide a cemented filling carbon fixation test device for simulating and evaluating the carbon fixation efficiency of carbon dioxide in the filling body, so as to provide a reliable quantitative basis and technical support for the storage of carbon dioxide.

[0006] The technical solution of the present invention is: A test device for testing the carbon fixation amount of cementitious filling, comprising: a carbon fixation reactor, the carbon fixation reactor comprising: a curing box, which is internally provided with a specimen rack, the specimen rack being a multi-layer structure for accommodating different types of cementitious filling specimens, the curing box being sealed, and a plurality of gas distribution holes being arranged on the periphery of the box body to ensure that carbon dioxide can be evenly distributed and fully contact with the cementitious filling specimens, and an exhaust pipe being arranged at the bottom; a mass scale, which is a precision mass scale, is arranged below the curing box and is used to measure the mass change of the cementitious filling specimens during the reaction; the precision of the precision mass scale is 0.01 gram, and it can accurately measure the slight mass change of the cementitious filling specimens, a plurality of sensors are arranged in the curing box, and the plurality of sensors are used to collect the temperature value, pressure value and carbon dioxide concentration value in the curing box; a gas supply system, comprising a carbon dioxide gas cylinder, is connected through a gas supply pipe to the curing box; It is connected to the gas distribution hole through a gas pipeline, and the gas pipeline is equipped with a first solenoid valve, a gas flow meter and a pressure regulating valve, which provide a stable carbon dioxide gas source for the curing box while simulating the gas supply of the carbon fixation reaction during actual mine filling. The gas pipeline is also equipped with a first ball valve; the control system includes: a reaction control system, which maintains communication connection with the first solenoid valve, the gas flow meter and the pressure regulating valve, and is used to control the introduction time, introduction amount and introduction pressure of carbon dioxide; a data acquisition system, which is connected and communicated with multiple sensors, and is used to receive temperature data, pressure data and carbon dioxide concentration data collected by the sensors; a data processing system, which communicates with the data acquisition system, and is used to record the data received by the data acquisition system. The carbon fixation amount is reflected by the mass change before and after the CO2 gas is introduced into the test device for curing. The control system can adjust the gas supply conditions in real time according to the test situation to ensure the accuracy of the test.

[0007] Furthermore, the curing box of the carbon fixation reactor is equipped with a sealed door to ensure a sealed environment in the curing box, and a handle is provided on the sealed door.

[0008] Furthermore, it also includes: an air compressor, the output end of the air compressor is connected to the curing box, and a third ball valve is arranged on the output end of the air compressor. The air compressor is used to adjust the air pressure in the curing box.

[0009] Furthermore, a safety valve is provided on the top of the curing box to adjust the pressure in the curing box to ensure stable operation of the test device and avoid the influence of excessively high or low pressure on the stability of the test device.

[0010] Furthermore, a vacuum pump, a second electromagnetic valve and a second ball valve are arranged on the exhaust pipe. Before and after the test, the gas in the curing box is evacuated by the vacuum pump to reduce the error of the test data.

[0011] Furthermore, it also includes a temperature control module, and the temperature of the curing box is controlled by the temperature control module. The temperature control module uses a water bath heating and insulation method to achieve temperature control of the curing box. The water bath heating and insulation method can accurately set and control the heating temperature, ensure that the reaction is carried out under stable temperature conditions, and improve the accuracy and repeatability of the test results.

[0012] Furthermore, the multiple sensors are respectively: a temperature sensor, a pressure sensor and a carbon dioxide concentration sensor.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is based on the cementing filling technology of mine goafs. By introducing carbon dioxide into the cementing filling specimens, it is possible to achieve long-term solidification of carbon in the abandoned space of the mine. The specimen rack inside the carbon fixation reactor accommodates various types of cementing filling specimens to simulate the structure of the actual mine filling body and the environment of the carbon fixation reaction. The gas supply system accurately controls the amount, time and pressure of carbon dioxide gas, provides a stable carbon dioxide gas source for the curing box, and simulates the gas supply of the carbon fixation reaction during actual mine filling. The carbon dioxide gas is fully in contact with the cementing filling specimen through the evenly distributed gas distribution holes on the curing box, increasing the contact area between the cementing filling specimen and the carbon dioxide gas, ensuring the stable progress of the carbon fixation reaction, recording the mass change data of the cementing filling specimen measured by the mass scale during the reaction, reflecting the amount of carbon fixation generated according to the mass change of the cementing filling specimen, and evaluating its carbon fixation efficiency according to the carbon fixation amount of carbon dioxide, thereby realizing the accurate simulation of the carbon dioxide carbon fixation process in the actual mine goaf and the accurate evaluation of the carbon dioxide carbon fixation efficiency.

[0014] 2. The specimen rack inside the carbon fixation reactor of the present invention can set different types and levels of cemented filling specimens according to the filling structure of different mine goafs, and simulate different reaction environments through the gas supply system and control system. By comparing the carbon fixation effects under different test conditions, it is more conducive to analyzing the optimal reaction environment and data for improving the carbon fixation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the test device of the present invention.

[0016] Figure 2 It is a schematic diagram of the cumulative carbon fixation curve under the test conditions of the present invention with a gas pressure of 3 MPa and a temperature of 40°C.

[0017] Among them, 1. maintenance box, 2. handle, 3. mass scale, 4. air compressor, 5. gas distribution hole, 6. temperature control module, 7. pressure sensor, 8. temperature sensor, 9. safety valve, 10. carbon dioxide cylinder, 11. gas flow meter, 12. pressure regulating valve, 13. first solenoid valve, 14. first ball valve, 15. second ball valve, 16. second solenoid valve, 17. vacuum pump, 18. specimen rack, 19. third ball valve. DETAILED DESCRIPTION

[0018] Combine the following Figure 1 and Figure 2 , the specific embodiments of the present invention are described in detail. In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0019] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0020] It should be noted that the circuit connections of the control system involved in the present invention all adopt conventional circuit connection methods and do not involve any innovation.

[0021] Example like Figure 1As shown, a test device for testing the carbon fixation amount of cementing filling comprises: a carbon fixation reactor, a gas supply system and a control system. The carbon fixation reactor comprises: a curing box 1, a mass scale 3 and a plurality of sensors. A specimen rack 18 is arranged inside the curing box 1. The specimen rack 18 is a multi-layer structure for accommodating different types of cementing filling specimens. The curing box 1 is sealed, and a plurality of gas distribution holes 5 are arranged on the periphery of the box body to ensure that the carbon dioxide gas can be evenly distributed and fully contact with the cementing filling specimen. An exhaust pipe is arranged at the bottom of the curing box 1; the mass scale 3 is a precision mass scale, which is arranged below the curing box 1, and is used to measure the mass change of the cementing filling specimen during the reaction, and reflect the generated carbon fixation amount according to the mass change of the cementing filling specimen; the precision of the precision mass scale is 0.01 grams, and it can accurately measure the tiny mass change of the cementing filling specimen. A plurality of sensors are arranged in the curing box 1, which are: a temperature sensor 8, a pressure sensor 7 and a carbon dioxide concentration sensor. , respectively used to measure and collect the temperature value, pressure value and carbon dioxide concentration value in the curing box 1; the gas supply system includes a carbon dioxide gas cylinder 10, which is connected to the gas distribution hole 5 through a gas pipeline. The gas pipeline is equipped with a first solenoid valve 13, a gas flow meter 11 and a pressure regulating valve 12, which provide a stable carbon dioxide gas source for the curing box 1 while simulating the gas supply of the carbon fixation reaction during actual mine filling. The gas pipeline is also equipped with a first ball valve 14; the control system includes: a reaction control system and a data acquisition system, the reaction control system is connected and communicated with the first solenoid valve 13, the gas flow meter 11 and the pressure regulating valve 12, and is used to control the introduction time, introduction amount and introduction pressure of carbon dioxide; the data acquisition system is connected and communicated with multiple sensors, and is used to receive the temperature data, pressure data and carbon dioxide concentration data collected by the sensors; the data processing system communicates with the data acquisition system, and is used to record the data received by the data acquisition system. The carbon fixation amount is reflected by the mass change before and after the CO2 gas is introduced into the test device for curing. The control system can adjust the gas supply conditions in real time according to the test situation to ensure the accuracy of the test.

[0022] In some embodiments, in order to facilitate the placement of cementing filling specimens and ensure a sealed environment in the curing box 1 , the curing box 1 of the carbon fixation reactor is provided with a sealed door, and a handle 2 is provided on the sealed door.

[0023] In some embodiments, an air compressor 4 is further included, the output end of the air compressor 4 is connected to the curing box 1, and a third ball valve 19 is provided on the output end of the air compressor 4. The air pressure in the curing box 1 is adjusted by the air compressor 4.

[0024] In some embodiments, a safety valve 9 is disposed on the top of the curing box 1 to adjust the pressure in the curing box 1 to ensure stable operation of the test device and avoid the influence of excessively high or low pressure on the stability of the test device.

[0025] In some embodiments, the exhaust pipe is provided with a vacuum pump 17, a second solenoid valve 16, and a second ball valve 15. The second solenoid valve 16 and the vacuum pump 17 are connected to the same power supply, and the opening and stopping of the vacuum pump 17 directly controls the opening and closing of the second solenoid valve 16. When the vacuum pump 17 stops working or the power supply is suddenly interrupted, the second solenoid valve 16 can automatically close the vacuum system and fill the atmosphere into the pump chamber through the air inlet of the vacuum pump 17 to avoid pump oil reflux and contamination of the vacuum system. Before and after the test, the gas in the curing box 1 is evacuated through the vacuum pump 17 to reduce the error of the test data.

[0026] In some embodiments, a temperature control module 6 is further included, and the temperature of the curing box 1 is controlled by the temperature control module 6. The temperature control module 6 uses a water bath heating and heat preservation method to achieve temperature control of the curing box 1. The water bath heating and heat preservation method can accurately set and control the heating temperature, ensure that the reaction is carried out under stable temperature conditions, and improve the accuracy and repeatability of the test results.

[0027] The specific operation steps of the test device test of this embodiment are as follows: Preparation: Fill the carbon fixation reactor with the required materials to simulate the filling structure of the mine goaf. Connect the gas supply system and ensure that the gas flow meter 11 and the pressure regulating valve 12 are working properly. Turn on the data acquisition system and ensure that all sensors are in working condition.

[0028] Set test parameters: Set the test parameters in the reaction control system, including gas supply, pressure, and reaction time.

[0029] Start the test: Start the reaction control system and start gas supply. Carbon dioxide gas enters the carbon fixation reactor under the set flow rate and pressure conditions and reacts with the cementing filling specimen. The pressure range is 1MPa~7MPa, the temperature is 0℃~100℃, and the gas flow rate is 0.1L / min~2L / min.

[0030] Data acquisition and monitoring: During the test, the control system is connected to the computer terminal, which is equipped with a display screen module. The temperature, pressure and carbon dioxide concentration values ​​collected by the sensor are received through the data acquisition system. The data processing system records the data received by the data acquisition system and transmits the recorded data to the computer terminal. The reaction control system sends the carbon dioxide introduction time, introduction amount and introduction pressure to the computer terminal in real time. The experimenters can view the changes of various data in the experiment in real time through the display interface of the display screen module.

[0031] End of test and system shutdown: After reaching the set test duration or meeting the predetermined carbon fixation target, the control system automatically stops the gas supply. At this time, the data acquisition system will continue to record the relevant parameters in the reactor until all parameters are stable and the equipment is shut down. Turn off the gas supply system and ensure that the gas flow has completely stopped before shutting down the control system.

[0032] Data processing and analysis: After the test, record the mass change data of the cemented filling specimens measured by the mass scale during the reaction process. The amount of carbon fixation generated is reflected based on the mass change of the cemented filling specimens, and its carbon fixation efficiency is evaluated based on the carbon fixation amount of carbon dioxide.

[0033] Specific as Figure 2 As shown, the carbon fixation amount measured by this test device at a gas pressure of 3MPa and a temperature of 40°C after curing for 28 days is 4.06mg / g.

[0034] After the test was completed, the cemented filling specimens inside the reactor were sampled and analyzed at different positions, and the carbon fixation effect of the sampling samples was evaluated by the existing thermogravimetric analysis test method. The measured carbon fixation amount was 2.24 mg / g~3.52 mg / g, and compared with the carbon fixation amount measured by this experimental device. It was found that: the carbon fixation amount in different parts of the thermogravimetric test method varied by more than 1.0 mg / g, and could not be used as a reference standard for the carbon fixation amount of the entire filling material; the carbon fixation amount obtained by the thermogravimetric analysis test method was smaller than the carbon fixation amount obtained by the test of this device, because the cumulative carbon fixation amount tested by this device includes not only the chemical reaction carbon fixation amount but also the physical adsorption amount. Therefore, compared with the existing thermogravimetric analysis test method, the carbon fixation data tested by this device is more accurate and reliable.

[0035] The above disclosures are only several preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A test device for testing the amount of carbon fixed in cementing filling, characterized in that: include: A carbon fixation reactor comprises: a curing box (1) having a specimen rack (18) disposed therein, the specimen rack (18) being a multi-layer structure for accommodating different types of cementing filling specimens, the curing box (1) being sealed, having a plurality of gas distribution holes (5) disposed on the periphery of the box body, and an exhaust pipe disposed at the bottom; a mass scale (3) disposed below the curing box (1) for measuring mass changes of the cementing filling specimens during a reaction process; and a plurality of sensors disposed in the curing box (1) for collecting temperature values, pressure values, and carbon dioxide concentration values ​​in the curing box; A gas supply system connected to the gas distribution hole via a gas pipeline, wherein the gas pipeline is provided with a first solenoid valve (13), a gas flow meter (11) and a pressure regulating valve (12); The control system comprises: a reaction control system connected to and in communication with the first electromagnetic valve (13), the gas flow meter (11) and the pressure regulating valve (12), and used to control the introduction time, introduction amount and introduction pressure of carbon dioxide; a data acquisition system connected to and in communication with a plurality of sensors, and used to receive data collected by the sensors; and a data processing system connected to and in communication with the data acquisition system, and used to record data received by the data acquisition system.

2. A cementing filling carbon fixation test device according to claim 1, characterized in that: It also comprises a temperature control module (6), the temperature of the curing box (1) being controlled by the temperature control module (6), and the temperature control module (6) adopts a water bath heating and heat preservation method to achieve temperature control of the curing box (1).

3. A cementing filling carbon fixation test device according to claim 1, characterized in that: Also includes: An air compressor (4), the output end of the air compressor (4) being in communication with the curing box (1), and a third ball valve (19) being arranged on the output end of the air compressor (4).

4. A cementing filling carbon fixation test device according to claim 1, characterized in that: The top of the curing box (1) is provided with a safety valve (9).

5. The test device for testing the amount of carbon fixed in cementing filling according to claim 1 is characterized in that: The gas transmission pipeline is also provided with a first ball valve (14).

6. A cementing filling carbon fixation test device according to claim 1, characterized in that: A vacuum pump (17), a second solenoid valve (16) and a second ball valve (15) are arranged on the exhaust pipe.

7. The test device for testing the amount of carbon fixed in cementing filling according to claim 1 is characterized in that: The mass scale (3) is a precision mass scale.

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