Test system and method for rapidly and quantitatively monitoring carbon dioxide absorption capacity of building material

Abstract

The invention discloses a test system and method for rapidly and quantitatively monitoring the carbon dioxide absorption capacity of a building material, and the system comprises a carbon dioxide gas cylinder, a gas displacement propulsion device, and a reaction kettle, and the carbon dioxide gas cylinder provides a gas source for the gas displacement propulsion device. The gas displacement propelling device is used for quantitatively conveying gas according to the carbon dioxide concentration required by the carbon negative capacity experiment of the building material in the reaction kettle, and the reaction kettle internally comprises a sensor group for measuring temperature, humidity and carbon dioxide concentration, a heating device, a humidifying device, a pressure film sensor and the like; in the testing process, sufficient carbon dioxide gas is firstly introduced into the gas displacement propelling device, the displacement propelling device introduces quantitative carbon dioxide gas into the reaction kettle according to real-time concentration data feedback of the sensor assembly, and meanwhile, the heating and humidifying device adjusts the temperature and humidity in the reaction kettle to be constant. By regulating the reaction conditions of temperature and humidity in the reaction kettle and carbon dioxide concentration, the carbon dioxide adsorption capacity of the solid or slurry material is hermetically monitored in real time, and the method has the advantages of high data reliability, nondestructive testing, simplicity and convenience in operation and the like, and can be widely applied to rapid quantitative detection of carbon dioxide absorption of the material.

Description

Technical Field

[0001] The present invention relates to the technical field of material negative carbon performance detection, and in particular to a testing system and method for quickly and quantitatively monitoring the carbon dioxide absorption capacity of building materials. Background Art

[0002] As the global trend of carbon reduction advances, the negative carbon performance of building materials (i.e., the ability to absorb carbon dioxide) has become a research hotspot. In this context, how to quantitatively evaluate the negative carbon capacity of building materials in complex environments has become an urgent problem to be solved in the civil construction industry.

[0003] At present, a lot of research and innovation are concentrated in the following two aspects: research and development of solid waste materials to replace cement to reduce carbon dioxide emissions in the material production process; strengthen the interaction of the material with carbon dioxide during preparation, curing and after curing. For the latter, there is no clear quantitative standard, and intelligent testing systems and reliable testing methods are still to be solved. Currently known methods include thermogravimetric testing and mass difference method. However, thermogravimetric testing is a destructive test, and the mass difference method is difficult to control the loss of water content of the sample, resulting in low data reliability, and it is impossible to achieve real-time monitoring and closed, automated, and intelligent control of multiple environmental factors. Therefore, the civil construction industry has put forward new requirements for the detection of negative carbon performance of materials, and it is necessary to develop corresponding detection equipment and test systems. Therefore, the civil construction industry has put forward new requirements for the detection of negative carbon performance of materials, and it is necessary to develop corresponding detection equipment and test systems. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a test system and method for quickly and quantitatively monitoring the ability of building materials to absorb carbon dioxide, thereby improving the accuracy and reliability of test data and providing an efficient and reliable solution for quantitative monitoring of the negative carbon performance of building materials.

[0005] Technical solution: To achieve the above-mentioned purpose, a test system for quickly and quantitatively monitoring the ability of building materials to absorb carbon dioxide described in the present invention includes a carbon dioxide cylinder, a gas displacement propulsion device, and a reactor. The carbon dioxide cylinder provides a gas source to the gas displacement propulsion device, and the gas displacement propulsion device performs quantitative gas delivery according to the carbon dioxide concentration required for the building material carbon dioxide adsorption capacity experiment in the reactor. The reactor includes a sensor group for measuring temperature, humidity, and carbon dioxide concentration, as well as a heating device and a humidifying device.

[0006] Among them, when used for monitoring the carbon dioxide adsorption capacity of fixed building materials, the reactor includes a sample holder, and the sample holder is used to set up fixed building materials or set up pressure membrane sensors. When the sample holder is used to set up pressure membrane sensors, the fixed building materials are placed on the pressure membrane sensors.

[0007] Wherein, a rotating motor is arranged on the reactor cover, and a power output end of the rotating motor is connected to a fan or a planetary stirring paddle.

[0008] The gas displacement propulsion device comprises a propulsion motor, a displacement sensor and a gas storage box. One side of the gas storage box comprises an air inlet and an air outlet. The air inlet is connected to a gas cylinder, and the air outlet is connected to an inner cavity of a reactor. A piston is arranged in the gas storage box. The piston is connected to a power output end of a motor through a moving rod. The displacement sensor is used to monitor the displacement of the piston in real time. The motor controls the moving rod to push or retract the piston, so as to realize quantitative gas storage and exhaust of the gas storage box (4).

[0009] Among them, the air inlet connecting the reactor and the gas storage box is provided with a three-way valve, and the three-way valve includes a three-way T-tube, and the three ports of the three-way T-tube are respectively connected to the gas storage box, the atmosphere, and the reactor, and electric valves are provided on the three ports.

[0010] It also includes a computer control system, which makes corresponding adjustments to the working states of the gas displacement propulsion device, the humidification device, and the annular resistance heating device based on the information fed back by the sensors.

[0011] The present invention provides a testing method for the testing system for rapidly and quantitatively monitoring the carbon dioxide absorption capacity of building materials, comprising:

[0012] Based on the absence of samples, the initial temperature, humidity and carbon dioxide concentration in the reactor are set, and the concentration change A of the carbon dioxide concentration in the reactor before and after the experiment is measured; the sample is placed in the reactor, and the temperature and humidity in the reactor are set to be the same as when there is no sample, and the concentration change B of the carbon dioxide concentration in the reactor before and after the experiment is measured, and the difference between the concentration change A and the concentration change B is used to judge the carbon dioxide absorption capacity of the sample;

[0013] Or first establish a data table of the change in carbon dioxide concentration under different initial temperature and humidity combinations in the reactor when there is no sample; during the sample experiment, measure the concentration change C of carbon dioxide concentration in the reactor before and after the experiment, and judge the carbon dioxide absorption capacity of the sample by the difference between the concentration change C and the corresponding carbon dioxide change under the same temperature and humidity in the data table;

[0014] During the experiment, the temperature and humidity in the reactor are adjusted by a heating device and a humidifying device, and only the initial temperature and humidity values ​​are set according to the experimental requirements, or the temperature and humidity are maintained at constant values ​​during the experiment, or the temperature and humidity are set to change over time.

[0015] The present invention provides a testing method for the testing system for rapidly and quantitatively monitoring the carbon dioxide absorption capacity of building materials, comprising:

[0016] The sample is placed on the pressure membrane sensor in the reactor, and the initial values ​​of temperature, humidity and carbon dioxide concentration in the reactor are set. During the experiment, the carbon dioxide concentration is kept constant. The mass change of the sample before and after the experiment is measured by the pressure membrane sensor, and the humidity change in the reactor before and after the experiment is measured by the sensor assembly. The sum of the mass change and the humidity change is the carbon dioxide absorption capacity;

[0017] Or before the experiment begins, set the initial values ​​of temperature, humidity and carbon dioxide concentration in the reactor. During the experiment, measure the mass change of the sample before and after the experiment through the pressure membrane sensor, and measure the humidity change in the reactor before and after the experiment through the sensor assembly. The sum of the mass change and the humidity change is the carbon dioxide absorption capacity.

[0018] The temperature and humidity in the reactor are adjusted by a heating device and a humidifying device. During the experiment, only the initial temperature value is set according to the experimental requirements, or the temperature is maintained at a constant value, or the temperature is set to a value that changes over time.

[0019] Beneficial effects: The present invention has the following advantages: 1. The present invention realizes precise regulation of multiple environmental factors by combining closed, intelligent control and real-time monitoring of temperature, humidity and carbon dioxide concentration;

[0020] 2. Use high-precision sensors to monitor carbon dioxide absorption and sample mass changes in real time, avoiding the limitations of traditional destructive testing methods and ensuring the non-destructive nature of the testing process;

[0021] 3. The detachable reactor design and accessory replacement can meet the testing requirements of different materials and processes, significantly improving the versatility of the system;

[0022] 4. Based on automatic control and real-time feedback mechanism, the accuracy and reliability of test data are significantly improved, providing an efficient and reliable solution for the quantitative monitoring of the negative carbon performance of building materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the test system of the present invention;

[0024] Figure 2 A top view of a reaction kettle in the test system of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the reactor in the test system of the present invention applied to the negative carbon performance monitoring of the slurry mixture;

[0026] Figure 4 This is a bar graph of the 24-hour carbon dioxide absorption of the solid waste sample. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is described in detail below in conjunction with the embodiments and drawings.

[0028] The testing system for rapidly and quantitatively monitoring the carbon dioxide absorption capacity of building materials of the present invention can quantitatively monitor the carbon dioxide absorption capacity of solid waste materials and slurry mixtures.

[0029] As shown in Figures 1 and 2 , the system includes a carbon dioxide gas cylinder 5 , a gas displacement propulsion device 1 , a real-time monitoring reactor 6 and a computer control system 16 .

[0030] The gas displacement propulsion device 1 includes a propulsion motor 2, a displacement sensor 3 and a gas storage box 4. One side of the gas storage box 4 includes an air inlet and an air outlet, the air inlet is connected to the gas cylinder 5, and the air outlet is connected to the inner cavity of the reactor 6. There is a piston in the gas storage box 4, and the piston is connected to the power output end of the motor 2 through a moving rod. The displacement sensor 3 is used to monitor the displacement of the piston in real time. The motor 2 controls the moving rod to push or retract the piston to achieve quantitative gas storage and exhaust of the gas storage box 4. The motor 2 is a linear motor or a servo motor.

[0031] The reactor is a detachable structure, including a reactor body and a reactor cover, and the reactor body and the reactor cover are sealed and connected by multiple sets of screws 14. A three-way valve is provided at the air inlet connecting the reactor to the gas storage box 4. The three-way valve includes a three-way T-tube, one end of which is connected to the gas storage box 4, one end is connected to the atmosphere, and the other end is connected to the reactor, and electric valves are provided at the three ends. The electric valve is controlled by a computer system, and automatically opens when carbon dioxide is introduced, and automatically closes after the introduction is completed. When the steel cylinder 5 ventilates the gas storage box 4, the manual valve is opened to exhaust the air in the gas storage box 4. When carbon dioxide is passed from the steel cylinder 5 to the gas storage box 4, the valves are all closed. After the carbon dioxide introduced into the gas storage box 4 reaches the required volume, valves a and b are opened at the same time to release the pressure, and then valve b is immediately closed, and valve c is opened to ventilate the reactor.

[0032] When the reactor quantitatively monitors the ability of solid waste materials to absorb carbon dioxide, the specific structure is as follows:

[0033] A sample holder for placing solid waste materials is provided at the bottom of the reactor body. The sample holder can be used to directly place solid waste materials or directly place a pressure membrane sensor 12 according to the purpose of the experiment. The solid waste materials are placed on the pressure membrane sensor 12 to monitor the mass changes of the solid waste materials during the process of carbon dioxide adsorption, thereby realizing real-time quality difference monitoring.

[0034] The side wall of the reactor is provided with a sensor assembly 10, a humidifying device 13, and an annular resistance heating device 9. The sensor assembly 10 includes temperature, humidity, and carbon dioxide concentration sensors. The sensor assembly 10, the humidifying device 13, and the annular resistance heating device 9 are used together to adjust the different temperature, humidity, and carbon dioxide concentration in the reactor cavity, thereby meeting the needs of various experimental conditions.

[0035] A rotating motor 8 is provided outside the reactor cover, and a power output end of the rotating motor 8 is connected to a fan 15, which is suspended at the upper end of the reactor chamber to prevent uneven distribution of carbon dioxide in the reactor chamber, with a higher concentration in the lower part than in the upper part, and to accelerate gas flow.

[0036] like Figure 3 As shown, when the reactor quantitatively monitors the ability of the slurry mixture 18 to absorb carbon dioxide, the specific structure is as follows:

[0037] The kettle body is used to place the slurry mixture, and the kettle cover is provided with a sensor assembly 10 and an annular resistance heating device 9. The sensor assembly 10 includes temperature, humidity, and carbon dioxide concentration sensors. The sensor assembly 10 and the annular resistance heating device 9 are used together to adjust the different temperatures and carbon dioxide concentrations in the reaction kettle cavity, thereby meeting the needs of various experimental conditions.

[0038] A rotating motor 8 is disposed outside the kettle cover, and a power output end of the rotating motor 8 is connected to a planetary stirring paddle 17 , which is used to stir the slurry mixture 18 .

[0039] As mentioned above, the displacement sensor 3, the sensor assembly 10, and the pressure membrane sensor 12 transmit the collected data to the computer control system 16 in real time. The computer control system 16 adjusts the working states of the propulsion motor 2, the electric valve, the humidification device 13, the annular resistance heating device 9, and the rotating motor 8 accordingly based on the information fed back by the sensors.

[0040] Embodiment 1:

[0041] Using the sample holder to directly set up the carbon dioxide absorption monitoring of cylindrical solid waste materials

[0042] Step 1: When there is no sample, the initial carbon dioxide concentration in the reactor is set to 3500ppm. The required carbon dioxide volume can be obtained according to the internal volume of the reactor. The gas displacement propulsion device reversely flushes a sufficient amount of carbon dioxide into the gas storage tank through the gas cylinder. At this time, the displacement sensor 3 records the piston displacement as the original displacement. After the required carbon dioxide volume is charged into the reactor through the cross-sectional area of ​​the gas storage tank and the pushing distance of the moving rod, the upper electric valve of the reactor is set to be closed, and it will not be opened in the subsequent process.

[0043] Step 2: Set the temperature in the reactor to 24 degrees Celsius and the relative humidity to 65 HR. The sensor assembly 10 feeds back to the computer control system 16 in real time to control the temperature and humidity in the reactor to reach the set temperature and humidity. At the same time, turn on the rotating motor and use the fan blades to evenly distribute the internal gas and keep it flowing.

[0044] Step 3: After 24 hours, the carbon dioxide concentration in the reactor was measured to be 3446 ppm, which proves that under this environmental condition, the humidity and moisture in the reactor absorbed a total of 54 ppm of carbon dioxide.

[0045] Step 4: Place the five different solid waste materials after curing into the reactor respectively, such as Figure 1 The temperature (24 degrees Celsius), humidity (65 HR) and initial carbon dioxide concentration (3500 ppm) in the reactor were set to be the same as when there was no sample. After 24 hours, the carbon dioxide concentrations in the reactor were measured to be 3301, 3373, 3314, 3247 and 3207 ppm, respectively, proving that under this environmental condition, the solid waste material samples and humidity in the reactor absorbed 199, 127, 186, 253 and 293 ppm of carbon dioxide, respectively.

[0046] Step 5: Subtract the monitoring result in step 3 from the monitoring result in step 4 to obtain the carbon dioxide absorption of each sample, which is 145, 73, 132, 199 and 239 ppm respectively. The monitoring results can be displayed in the form of a data graph, such as Figure 4 shown.

[0047] In this way, the carbon dioxide absorption amount of the measured solid waste material can be clearly obtained, and the solid waste material with the best negative carbon effect can be identified.

[0048] Embodiment 2:

[0049] The cylindrical solid waste material is placed on the pressure membrane sensor 12, and the carbon dioxide absorption is monitored

[0050] The same operation steps 1-4 as in Example 1 are performed. When the carbon dioxide concentration in the reactor decreases, the system is set to continue to introduce a corresponding amount of carbon dioxide volume according to the decreased carbon dioxide concentration, and the sample mass is monitored in real time through the pressure membrane sensor data to quantitatively monitor the interaction between the sample and carbon dioxide. At this time, it should be noted that the rotating motor should be temporarily turned off to avoid the influence of rapid gas flow on the data.

[0051] Embodiment 3:

[0052] Monitoring of CO2 absorption in slurry mixtures

[0053] The same operation steps 1-4 as in Example 1 can be performed, and the carbon dioxide can be stopped from being continuously introduced after the initial carbon dioxide concentration is set, or a fixed carbon dioxide value can be set, and carbon dioxide can be automatically introduced when the concentration decreases, so that the carbon dioxide concentration in the reactor remains constant. Figure 1 The lower part of the reactor is disassembled and replaced with Figure 3 The sample is replaced with the slurry to be monitored, and the rotating fan blades are replaced with a stirrer to stir the slurry and increase the contact area between the material and the carbon dioxide.

[0054] The present invention uniquely combines the closed, intelligent control and real-time monitoring of the three reaction conditions of temperature, humidity and carbon dioxide concentration, and realizes the automatic adjustment of various parameters. The device system can be applied to the rapid quantitative monitoring of carbon dioxide absorption of materials, and has the characteristics of high data reliability and non-destructive testing of samples. In addition, the reactor of the device can be disassembled and replaced to monitor the real-time absorption of carbon dioxide at different temperatures and carbon dioxide concentrations during the slurry stirring and mixing process. The invention meets the industry's research and development needs for material negative carbon function monitoring systems, and realizes the monitoring of the interaction between different materials and carbon dioxide in different processes.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A test system for rapid quantitative monitoring of the carbon dioxide absorption capacity of building materials, characterized in that: The invention comprises a carbon dioxide gas cylinder (5), a gas displacement propulsion device (1), and a reactor (6). The carbon dioxide gas cylinder (5) provides a gas source to the gas displacement propulsion device (1). The gas displacement propulsion device (1) performs quantitative gas delivery according to the carbon dioxide concentration required for a carbon dioxide adsorption capacity experiment of building materials in the reactor (6). The reactor (6) comprises a sensor group (10) for measuring temperature, humidity, and carbon dioxide concentration, as well as a heating device (9) and a humidifying device (13).

2. A test system for rapidly and quantitatively monitoring the carbon dioxide absorption capacity of building materials according to claim 1, characterized in that: When used for monitoring the carbon dioxide adsorption capacity of fixed building materials, the reactor (6) includes a sample rack, which is used to set up the fixed building materials or set up the pressure membrane sensor (12). When the sample rack is used to set up the pressure membrane sensor (12), the fixed building materials are placed on the pressure membrane sensor (12).

3. A test system for rapidly and quantitatively monitoring the carbon dioxide absorption capacity of building materials according to claim 2, characterized in that: A rotating motor (8) is provided on the reactor cover, and a power output end of the rotating motor (8) is connected to a fan (15) or a planetary stirring paddle (17).

4. A test system for rapid quantitative monitoring of the carbon dioxide absorption capacity of building materials according to claim 2, characterized in that: The gas displacement propulsion device (1) comprises a propulsion motor (2), a displacement sensor (3) and a gas storage box (4). One side of the gas storage box (4) comprises an air inlet and an air outlet. The air inlet is connected to a gas cylinder (5), and the air outlet is connected to an inner cavity of a reaction kettle (6). A piston is arranged in the gas storage box (4), and the piston is connected to a power output end of the motor (2) via a moving rod. The displacement sensor (3) is used to monitor the displacement of the piston in real time. The motor (2) controls the moving rod to push or retract the piston, so as to realize quantitative gas storage and exhaust of the gas storage box (4).

5. A test system for rapid quantitative monitoring of carbon dioxide absorption capacity of building materials according to claim 4, characterized in that: The air inlet connecting the reactor and the gas storage box (4) is provided with a three-way valve, the three-way valve comprises a three-way T-shaped pipe, the three ports of the three-way T-shaped pipe are respectively connected to the gas storage box (4), the atmosphere and the reactor (6), and the three ports are all provided with electric valves.

6. A test system for rapid quantitative monitoring of carbon dioxide absorption capacity of building materials according to claim 1, characterized in that: It also includes a computer control system (16), which adjusts the working states of the gas displacement propulsion device (1), the humidification device (13), and the annular resistance heating device (9) accordingly based on information fed back by the sensors.

7. A testing method applied to the testing system for rapidly and quantitatively monitoring the carbon dioxide absorption capacity of building materials as claimed in claim 1, characterized in that: include: Based on the absence of samples, the initial temperature, humidity and carbon dioxide concentration in the reactor were set, and the concentration change A of the carbon dioxide concentration in the reactor before and after the experiment was measured; The sample is placed in the reactor, and the temperature and humidity in the reactor are set to be the same as when there is no sample. The concentration change B of the carbon dioxide concentration in the reactor before and after the experiment is measured, and the carbon dioxide absorption capacity of the sample is judged by the difference between the concentration change A and the concentration change B; Or first establish a data table of the change in carbon dioxide concentration under different initial temperature and humidity combinations in the reactor when there is no sample; during the sample experiment, measure the concentration change C of carbon dioxide concentration in the reactor before and after the experiment, and judge the carbon dioxide absorption capacity of the sample by the difference between the concentration change C and the corresponding carbon dioxide change under the same temperature and humidity in the data table; During the experiment, the temperature and humidity in the reactor are adjusted by a heating device and a humidifying device, and only the initial temperature and humidity values ​​are set according to the experimental requirements, or the temperature and humidity are maintained at constant values ​​during the experiment, or the temperature and humidity are set to change over time.

8. A testing method applied to the testing system for rapidly and quantitatively monitoring the carbon dioxide absorption capacity of building materials as claimed in claim 1, characterized in that: include: The sample is placed on the pressure membrane sensor in the reactor, and the initial values ​​of temperature, humidity and carbon dioxide concentration in the reactor are set. During the experiment, the carbon dioxide concentration is kept constant. The mass change of the sample before and after the experiment is measured by the pressure membrane sensor, and the humidity change in the reactor before and after the experiment is measured by the sensor assembly. The sum of the mass change and the humidity change is the carbon dioxide absorption capacity; Or before the experiment begins, set the initial values ​​of temperature, humidity and carbon dioxide concentration in the reactor. During the experiment, measure the mass change of the sample before and after the experiment through the pressure membrane sensor, and measure the humidity change in the reactor before and after the experiment through the sensor assembly. The sum of the mass change and the humidity change is the carbon dioxide absorption capacity. The temperature and humidity in the reactor are adjusted by a heating device and a humidifying device. During the experiment, only the initial temperature value is set according to the experimental requirements, or the temperature is maintained at a constant value, or the temperature is set to a value that changes over time.

Images