Device and method for measuring carbon dioxide in solution

Abstract

The invention relates to the technical field of carbon dioxide detection, in particular to a device and method for measuring carbon dioxide in a solution, the measuring device comprises a box body, the top of the box body is provided with a first liquid inlet and a second liquid inlet, and the side wall of the box body is provided with a liquid outlet; the box body is internally provided with a first detection channel communicated with the first liquid inlet and a plurality of second detection channels communicated with the second liquid inlet, and the first detection channel and the plurality of second detection channels are internally provided with micro-conductivity sensors for detecting the CO2 load of a solution; the bottoms of the first detection channel and the second detection channel are connected with branch flow paths, and the branch flow paths are gathered to a main flow path to lead to the liquid outlet. According to the device, conductivity measurement is carried out on a standard solution with the known CO2 content, a standard curve is obtained by setting the CO2 content gradient, high-throughput measurement is carried out on the to-be-detected solution during use, and the portability and accuracy of equipment detection are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide detection, and in particular to a device and method for measuring carbon dioxide in a solution. Background Art

[0002] In the research of carbon capture and storage technology, solution CO 2 Load measurement is an important tool for evaluating carbon capture efficiency and determining CO 2 One of the important means to optimize the carbon capture process is to measure the absorption and release rate of the solution. 2 The concentration change of CO2 can be used to understand the working status and performance of the carbon capture system. 2 When measuring load, there is a lack of calibration comparison, the detection accuracy is low, the sampling volume is large, and the measurement process is relatively complicated. Summary of the invention

[0003] The object of the present invention is to provide a device and method for measuring carbon dioxide in a solution, which can solve the above technical problems.

[0004] The present invention provides a device for measuring carbon dioxide in a solution, comprising a box body, a first liquid inlet and a second liquid inlet are provided on the top of the box body, a liquid discharge port is provided on the side wall, a first detection channel connected to the first liquid inlet and a second detection channel connected to the second liquid inlet are provided inside the box body, a plurality of second detection channels are provided, and each of the first detection channel and the plurality of second detection channels is provided with a detection channel for detecting the solution CO 2 The first detection channel and the second detection channel are connected to the bottom of the branch road, and the branch road is gathered into a main road leading to the discharge port, which is used to discharge the measured solution. The first liquid inlet is used to drip the standard solution, and the second liquid inlet is used to drip the solution to be tested. The diameters of the first detection channel and the second detection channel are both micrometer-level specifications. The first liquid inlet is connected to the first detection channel. By measuring the standard solution with a certain concentration gradient, the standard curve required for the measurement can be fitted. The second liquid inlet is connected to the second detection channel by dividing multiple branches through a main road, which can achieve the effect of simultaneous multiple measurements of one sampling.

[0005] Preferably, the micro-conductivity sensor is electrically connected to a data processor for acquiring all data signals for processing. The data processor is installed at the bottom of the box. The output end of the data processor is electrically connected to a digital display LCD screen, which is used to display the measurement results.

[0006] Preferably, the digital display LCD screen is located on the top of the box.

[0007] Preferably, each of the branch flow paths is provided with an electromagnetic valve, the electromagnetic valve is electrically connected to the output end of the data processor, and the electromagnetic valve is switched on and off according to different working modes.

[0008] Preferably, a battery for supplying power to other electronic devices such as the micro-conductivity sensor, the data processor, the solenoid valve and the digital display LCD screen is fixedly installed in the box.

[0009] Preferably, the data processor has an external data socket.

[0010] The micro-conductivity sensor is connected to the micro-battery through the circuit, and forms a closed circuit through the solution in the channel to generate a current signal. The digital display LCD screen, the solenoid valve, and the micro-conductivity sensor are all connected to the data processor through the signal line. The data processor is responsible for sending the control program set according to the working mode to the solenoid valve, collecting the data signal of the micro-conductivity sensor, and transmitting the measurement result to the digital display LCD screen. The data processor is connected to the computer through the external data socket for program modification.

[0011] Preferably, the liquid discharge port is connected to a waste liquid tank.

[0012] The present invention also provides a method for measuring carbon dioxide in a solution, which is applied to the above-mentioned system and comprises the following steps:

[0013] Step 1: Close the solenoid valve at the bottom of the first detection channel and all the solenoid valves at the bottom of the second detection channel, and add CO to the first liquid inlet. 2 Content c 1 The standard solution enters the first detection channel and a conductivity signal σ is fed back through the microconductivity sensor. 1 To the data processor, enter the current c on the computer 1 and σ 1 ;

[0014] Step 2: After the input is completed, the solenoid valve at the bottom of the first detection channel is opened, and the standard solution is discharged through the drain port;

[0015] Step 3: Prepare different CO 2 The standard solutions with different CO contents were obtained in the same way. 2 Content c i Conductivity data of standard solution σ i , fit a standard curve c=kσ+b on the computer, and store the fitted curve in the data processor;

[0016] Step 4: Sample the solution to be tested and drip the solution to be tested into the second liquid inlet with a dropper. The solution to be tested enters the second detection channel through multiple branches divided from a main path of the second liquid inlet. The parallel measurement conductivity signal σ is fed back by the microconductivity sensors set in the multiple second detection channels. mi The data processor first averages the parallel measurement results to obtain σ m , then σ m Substitute it into the previously saved standard curve for calculation to obtain the CO 2 Content c m , and the data processor transmits it to the digital display LCD screen for display.

[0017] Preferably, after the standard solution is discharged through the drain port in step 2, deionized water is added dropwise to the first liquid inlet to clean the residual solution in the first detection channel, and the cleaning liquid is drained through the drain port.

[0018] Preferably, after the measurement in step 4 is completed, the data processor controls the solenoid valve at the bottom of the second detection channel to open, drains the solution to be tested through the drain port, drips deionized water into the second liquid inlet, cleans the residual solution in the second detection channel, and drains the cleaning liquid through the drain port.

[0019] Beneficial effects:

[0020] The device of the present invention is used for the known CO 2 The conductivity of the standard solution with the content of CO is measured by setting 2 The standard curve is obtained by the content gradient. When used, the solution to be tested is subjected to high-throughput measurement. The measurement results are compared and calculated with the standard curve saved in advance by the data processor to obtain the CO 2 The content improves the portability and accuracy of equipment detection. It solves the shortcomings of the existing measurement technology in the industry, such as lack of calibration comparison, low detection accuracy, and complicated operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the device for measuring carbon dioxide in solution of the present invention.

[0023] Explanation of the accompanying drawings: 1-box, 2-first liquid inlet, 3-second liquid inlet, 4-liquid discharge port, 5-first detection channel, 6-second detection channel, 7-microconductivity sensor, 8-branch flow path, 9-main flow path, 10-data processor, 11-digital display LCD screen, 12-solenoid valve, 13-battery. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. 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, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Example 1

[0028] A device for measuring carbon dioxide in a solution, such as Figure 1As shown, the box body 1 includes a box body 1, a first liquid inlet 2 and a second liquid inlet 3 are provided on the top of the box body 1, a liquid discharge port 4 is provided on the side wall, and the liquid discharge port 4 is connected to a waste liquid tank. A first detection channel 5 connected to the first liquid inlet 2 and a second detection channel 6 connected to the second liquid inlet 2 are provided inside the box body 1, and a plurality of second detection channels 6 are provided, and each of the first detection channel 5 and the plurality of second detection channels 6 is provided with a detection channel for detecting solution CO 2 The first detection channel 5 and the second detection channel 6 are connected to a branch road 8 at the bottom, and the branch road 8 is gathered into a main road 9 leading to the discharge port 4 for discharging the measured solution. The first liquid inlet 2 is used to drip the standard solution, and the second liquid inlet 3 is used to drip the solution to be tested. The diameters of the first detection channel 5 and the second detection channel 6 are both micrometer-level specifications. The first liquid inlet is connected to the first detection channel 5. By measuring the standard solution with a certain concentration gradient, the standard curve required for the measurement can be fitted. The second liquid inlet 3 is connected to the second detection channel 6 by dividing multiple branches through a main road, which can achieve the effect of simultaneous multiple measurements of one sampling.

[0029] In addition, the micro-conductivity sensor 7 is electrically connected to a data processor 10 for acquiring all data signals for processing. The data processor 10 is installed at the bottom of the box 1. The data processor 10 has an external data socket. The output end of the data processor 10 is electrically connected to a digital display LCD screen 11. The digital display LCD screen 11 is located at the top of the box 1 and is used to display the measurement results. A solenoid valve 12 is provided on each branch flow path 8. The solenoid valve 12 is electrically connected to the output end of the data processor 10. The solenoid valve is switched on and off according to different working modes. A battery 13 is fixedly installed in the box 1 for powering other electronic devices such as the micro-conductivity sensor 7, the data processor 10, the solenoid valve 12 and the digital display LCD screen 11.

[0030] The micro-conductivity sensor is connected to the micro-battery through the circuit, and the solution in the channel forms a closed circuit to generate a current signal. The digital LCD screen, solenoid valve, and micro-conductivity sensor are all connected to the data processor through signal lines. The data processor is responsible for sending the control program set according to the working mode to the solenoid valve, collecting the data signal of the micro-conductivity sensor, and transmitting the measurement results to the digital LCD screen. The data processor is connected to the computer through the external data socket for program modification.

[0031] In the calibration mode, the data processor 10 is connected to the computer through the external data socket, and the calibration mode command is issued on the computer side. The data processor 10 controls the electromagnetic valve at the bottom of the first detection channel 5 to close, and closes all the electromagnetic valves at the bottom of the second detection channel 6. The standard solution is prepared according to the components of the solution to be tested in the system operation, and a certain amount of CO is introduced. 2 , add the CO to the first liquid inlet 2 2Content c 1 The standard solution enters the first detection channel 5 and feeds back a conductivity signal σ through the micro conductivity sensor 7. 1 To the data processor 10, enter the current c on the computer side 1 and σ 1 After the data entry is completed, the data processor 10 controls the electromagnetic valve at the bottom of the first detection channel 5 to open, the standard solution is discharged through the drain port 4, and deionized water is added to the first liquid inlet 2 to clean the residual solution in the first detection channel 5, and the cleaning liquid is emptied through the drain port 4. Prepare different CO 2 The standard solutions with different CO contents were obtained in the same way. 2 Content c i Conductivity data of standard solution σ i , a standard curve c=kσ+b is fitted on the computer side, and the fitted curve is stored in the data processor 10. After completion, a measurement mode instruction is issued through the computer side, and the data processor 10 controls the electromagnetic valve at the bottom of the first detection channel 5 to close and disconnect the computer side connection.

[0032] In the measurement mode, it is only necessary to carry the device of the present invention to the measurement site, sample a small amount of the solution to be tested under the specific operating conditions of the carbon capture system, and drip a small amount of the solution to be tested into the second liquid inlet 3 with a dropper. The solution to be tested enters the second detection channel 6 through multiple branches separated from a main flow of the second liquid inlet 3, and the parallel measurement conductivity signal σ fed back by the micro-conductivity sensors 7 arranged in the multiple second detection channels 6 is mi The data processor 10 first averages the parallel measurement results to obtain σ m , then σ m Substitute it into the previously saved standard curve for calculation to obtain the CO 2 Content c m , and transmitted by the data processor 10 to the digital display LCD screen 11 for display. After the measurement is completed, the data processor 10 controls the electromagnetic valve at the bottom of the second detection channel 6 to open, and the solution to be tested is emptied through the drain port 4. Deionized water is added to the second liquid inlet 3 to clean the residual solution in the second detection channel 6, and the cleaning liquid is emptied through the drain port 4.

[0033] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: when in use, the first liquid inlet and the first detection channel enable the device to have a calibration mode, which is convenient for data comparison and rapid calculation of relevant detection data. By arranging each detection channel in the box, the overall structure of the device is compact and easy to carry; arranging multiple second detection channels enables the device to have high-throughput detection capabilities, thereby improving the accuracy and speed of device detection.

[0034] Finally, 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for measuring carbon dioxide in a solution, characterized in that: The invention comprises a box body, wherein a first liquid inlet and a second liquid inlet are provided on the top of the box body, a liquid discharge port is provided on the side wall, a first detection channel connected with the first liquid inlet and a second detection channel connected with the second liquid inlet are provided inside the box body, a plurality of second detection channels are provided, a micro-conductivity sensor for detecting the CO2 load of the solution is provided in the first detection channel and the plurality of second detection channels, a branch flow path is connected to the bottom of the first detection channel and the second detection channel, and the branch flow paths are gathered into a main flow path leading to the liquid discharge port.

2. The device for measuring carbon dioxide in solution according to claim 1, characterized in that: The micro-conductivity sensor is electrically connected to a data processor, and the output end of the data processor is electrically connected to a digital display liquid crystal screen.

3. The device for measuring carbon dioxide in solution according to claim 2, characterized in that: The digital display liquid crystal screen is located on the top of the box.

4. The device for measuring carbon dioxide in solution according to claim 3, characterized in that: The branch flow paths are each provided with an electromagnetic valve, and the electromagnetic valve is electrically connected to the output end of the data processor.

5. The device for measuring carbon dioxide in solution according to claim 4, characterized in that: A storage battery for supplying power to the micro-conductivity sensor, the data processor, the solenoid valve and the digital display liquid crystal screen is fixedly installed in the box.

6. The device for measuring carbon dioxide in solution according to claim 2, characterized in that: The data processor is provided with an external data socket.

7. The device for measuring carbon dioxide in solution according to claim 1, characterized in that: The liquid discharge port is connected with a waste liquid tank.

8. A method for measuring carbon dioxide in a solution, characterized in that: The method is applied to the system according to any one of claims 4 to 7, and the method comprises the following steps: Step 1: Close the solenoid valve at the bottom of the first detection channel and all the solenoid valves at the bottom of the second detection channel, and drip a standard solution with a CO2 content of c1 into the first liquid inlet. The solution enters the first detection channel, and a conductivity signal σ1 is fed back to the data processor through the micro-conductivity sensor. The c1 and σ1 at this time are recorded on the computer; Step 2: After the input is completed, the solenoid valve at the bottom of the first detection channel is opened, and the standard solution is discharged through the drain port; Step 3: Prepare standard solutions with different CO2 content gradients, and follow the same operation steps to obtain different CO2 content c i Conductivity data of standard solution σ i , fit a standard curve c=kσ+b on the computer, and store the fitted curve in the data processor; Step 4: Sample the solution to be tested and drip the solution to be tested into the second liquid inlet with a dropper. The solution to be tested enters the second detection channel through multiple branches divided from a main path of the second liquid inlet. The parallel measurement conductivity signal σ is fed back by the microconductivity sensors set in the multiple second detection channels. mi The data processor first averages the parallel measurement results to obtain σ m , then σ m Substitute it into the standard curve saved in advance to calculate and obtain the CO2 content c of the solution to be tested. m , and the data processor transmits it to the digital display LCD screen for display.

9. The method for measuring carbon dioxide according to claim 8, characterized in that: After the standard solution is discharged through the drain port in step 2, deionized water is added dropwise to the first liquid inlet to clean the residual solution in the first detection channel, and the cleaning solution is drained through the drain port.

10. The carbon dioxide measurement method according to claim 8, characterized in that: After the measurement in step 4 is completed, the data processor controls the solenoid valve at the bottom of the second detection channel to open, the solution to be tested is drained through the drain port, deionized water is added to the second liquid inlet, the residual solution in the second detection channel is cleaned, and the cleaning liquid is drained through the drain port.

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